JP6091423B2 - Seats and chairs - Google Patents

Description

  The present invention relates to a sitting tool and a chair.

  With the spread of personal computers, many workers, including those engaged in office work, are forced to work for long hours. Against this background, in recent years, there are many people who complain of low back pain and chronic fatigue on the back. Such low back pain and chronic fatigue on the back are often caused by the sitting posture during work. This will be described with reference to the drawings. FIGS. 17A and 17B are schematic views showing a part of the operator's skeleton when seated on a chair. In FIGS. 17A and 17B, the leg portions of the chair 7 are not shown in order to simplify the description.

  FIG. 17A shows an ideal posture of the worker. At this time, the pelvis 91 is supported by the seat plate 71 and the back plate 73 and is in an upright state. As a result, the spine 92 draws the same S-shaped curve as when the human body is standing, and the burden on the pelvis 91 and the spine 92 is reduced. If the operation can be continued while maintaining the S-shaped curve of the spine 92, chronic fatigue of the operator, such as lower back pain and lower back, can be considerably reduced.

  However, it is difficult to maintain such an ideal posture for a long time, and as the work continues for a long time, the operator's pelvis 91 naturally slides forward as shown in FIG. Go to sleep. In this state, the spine 92 is pressed against the back plate 73, and the spine 92 cannot maintain the S-curve. If such a posture is continued for a long time, an excessive load is applied to the pelvis 91 and the spine 92, which causes low back pain and chronic fatigue to the lower back. If the worker is always aware that he is seated in the state shown in FIG. 17A, the posture shown in FIG. 17B can be prevented, but the worker is immersed in his work. Therefore, if it is noticed, the posture shown in FIG.

  Patent Document 1 proposes a chair capable of simultaneously tilting a seat plate and a back plate backward. According to such a chair, by tilting the seat plate and the back plate backward, the pelvis is pressed against the back plate by the action of gravity, and the fatigue can be reduced.

Japanese Patent Laid-Open No. 10-57178

  However, even if the seat plate and the back plate of the chair are seated while tilting backward at the same time, even if the pelvis is raised, the spine is pressed against the back plate at this time. It is difficult to maintain a natural S-curve like when standing up. For this reason, the worker cannot maintain such a posture for a long time and eventually feels tired. In addition, when such a chair is used, there is a side effect that an operator places an excessive burden on the neck in order to view the display in front of the chair. On the other hand, in primary education such as kindergartens and elementary schools, it is desirable to have children and children with developing skeletons in good posture. It is very difficult to make it happen.

  The present invention has been made in view of the above situation, and it is an object of the present invention to provide a sitting tool and a chair that can make a sitting posture of a seated person naturally good and can be comfortably seated. To do.

  The gist configuration of the present invention for achieving the above object is as follows.

The sitting tool of the present invention is
In a sitting tool with a seat plate,
The seat plate is
The first seat,
A second seating surface extending continuously from the first seating surface in the front direction of the sitting tool;
With
The second seating surface forms a step at a position higher than the first seating surface by the end surface on the first seating surface side,
When the first seating surface supports the buttocks of the seated person and the second seating surface supports the upper part of the thigh of the seated person, the stepped portion is restricted from moving forward by the step,
The first seat surface extends over the entire length of the seat plate in the left-right direction of the sitting tool without being obstructed by the step.
According to the above-described seating tool of the present invention, since the seated person's sciatic bone is restricted from moving forward by the step, the seated position of the seated person can be naturally improved.
Further, since the first seat surface extends over the entire length of the seat plate in the left-right direction of the sitting tool without being disturbed by the step, the first step surface does not press the left and right sides of the seated person's buttocks. As a result, the seated person can sit comfortably without feeling pressure on the buttocks.

In the sitting tool of the present invention,
It is preferable that the end surface on the first seating surface side of the second seating surface is formed to be curved or bent so as to be convex in the front direction of the sitting tool when viewed in plan.
According to this configuration, it is possible to absorb a slightly different sciatic position difference depending on the individual difference of the seated person, and to improve the seated posture of the seated person more effectively, and the step is an outline of the sciatic bone in a plan view. Since it becomes more conforming to the shape, the seated person can sit more comfortably.

In the sitting tool of the present invention,
The seating tool in which the maximum length in the front-rear direction of the sitting tool in the region excluding the central region in the left-right direction of the sitting tool of the second seating surface excluding the end surface on the first seating surface side is the seating tool It is preferable to be shorter than the maximum length in the front-rear direction.
According to this configuration, the upper part of the thigh of the seated person can be prevented from being widely pressed against the second seating surface, and the seated person can sit comfortably for a long time, and the sitting tool can be configured to be extremely compact. it can.

Furthermore, in the sitting tool of the present invention,
The maximum length of the first seating surface in the front-rear direction of the sitting tool is 70 mm or more and 250 mm or less, and a central region in the left-right direction of the sitting tool of the second seating surface excluding the end surface on the first seating surface side. It is preferable that the maximum length of the sitting area in the front-rear direction of the sitting tool is 150 mm or less.
According to this configuration, the suitable size of the first seating surface ensures a size that allows the seated person's buttocks to be placed on the first seating surface and suppresses the seat from moving forward. However, the sitting posture of the seated person can be improved. Further, the upper part of the thigh of the seated person can be prevented from being widely pressed against the second seating surface, so that the seated person can sit comfortably for a long time, and the sitting tool can be configured to be extremely compact.

A preferred example of the sitting tool of the present invention is:
It further includes a back plate that extends from an end portion of the seat plate on the first seat surface side and extends at least partially at a substantially right angle to the seat plate.
According to this configuration, the seating posture of the seated person can be improved even when there is no wall surface extending substantially perpendicular to the horizontal plane on which the seating tool should be placed, which should contact the sacrum of the seated person. Can do.

Other preferred examples of the sitting tool of the present invention are:
A support for supporting the seat plate;
The support includes a bottom plate on which the seat plate is placed, and a back plate that extends from an end of the seat plate on the first seat surface side and extends at least partially at a right angle to the bottom plate. And have.
According to this configuration, the seating posture of the seated person can be improved even when there is no wall surface extending substantially perpendicular to the horizontal plane on which the seating tool should be placed, which should contact the sacrum of the seated person. If the seat plate and the support are configured separately, the size of the pelvis that is slightly different depending on the individual difference of the seated person can be absorbed, and the seated posture of the seated person can be improved more effectively. Can do.

The chair of the present invention
In a chair with a seat plate, a back plate, and legs,
The seat plate is
The first seat,
A second seat surface extending continuously from the first seat surface in the front direction of the chair;
With
A front surface of the back plate located on the side of the seat plate extends at least partially at a substantially right angle to the first seat surface;
The second seating surface forms a step at a position higher than the first seating surface by the end surface on the first seating surface side,
When the first seat surface supports the buttocks of the seated person and the second seat surface supports the upper part of the thigh of the seated person, the back plate restricts the seated person's ischi from moving forward by the step. Restricting the sacrum of the seated person to move backward by the front of the
The first seat surface extends over the entire length of the seat plate in the left-right direction of the chair without being obstructed by the step,
An end surface of the second seat surface on the first seat surface side is formed to be curved or bent so as to be convex in the front direction of the chair when viewed in plan.
According to the chair of the present invention described above, the seated person's sitting posture can be naturally improved because the seated person's sciatic bone is restricted from moving forward by the step.
Moreover, since the first seat surface extends over the entire length of the seat plate in the left-right direction of the chair without being obstructed by the step, the step does not press on the left and right sides of the seated person's buttocks. As a result of supporting the seated person's buttocks, the seated person can sit comfortably without feeling a sense of pressure on the buttocks.
Furthermore, since the end surface of the second seat surface on the first seat surface side is formed to be curved or bent so as to be convex in the front direction of the chair when viewed in plan, it is subtle depending on the individual difference of the seated person. This makes it possible to absorb the difference in the position of the different sciatic bones and effectively improve the sitting posture of the seated person. Can sit on.

Other chairs of the present invention
In a chair with a seat plate, a back plate, and legs,
The seat plate is
The first seat,
A second seat surface extending continuously from the first seat surface in the front direction of the chair;
With
A front surface of the back plate located on the side of the seat plate extends at least partially at a substantially right angle to the first seat surface;
The second seating surface forms a step at a position higher than the first seating surface by the end surface on the first seating surface side,
When the first seat surface supports the buttocks of the seated person and the second seat surface supports the upper part of the thigh of the seated person, the back plate restricts the seated person's ischi from moving forward by the step. Restricting the sacrum of the seated person to move backward by the front of the
The first seat surface extends over the entire length of the seat plate in the left-right direction of the chair without being obstructed by the step,
The maximum length of the first seat surface in the front-rear direction of the chair is 70 mm or more and 250 mm or less, and the region of the second seat surface excluding the end surface on the first seat surface side excluding the central region in the left-right direction of the chair. The maximum length of the chair in the front-rear direction is 150 mm or less.
According to the other chair of the present invention, the seating of the seated person is ensured by a suitable size of the first seating surface, while ensuring a size such that the buttocks of the seated person can be placed on the first seating surface. The posture can be improved. In addition, the upper thigh of the seated person can be prevented from being widely pressed against the second seat surface, so that the seated person can sit comfortably for a long time, and the chair can be configured to be extremely compact.

  ADVANTAGE OF THE INVENTION According to this invention, the sitting posture and chair which can make a seating attitude | position of a seated person naturally favorable and can sit comfortably can be provided.

It is a perspective view which shows 1st embodiment of the sitting tool of this invention. It is the sectional view on the AA line in FIG. 1 which shows the usage condition of the sitting tool of FIG. It is a perspective view which shows 2nd embodiment of the sitting tool of this invention. It is a perspective view which shows 3rd embodiment of the sitting tool of this invention. It is a perspective view which shows 4th embodiment of the sitting tool of this invention. It is a perspective view which shows 5th embodiment of the sitting tool of this invention. It is a perspective view which shows 6th embodiment of the sitting tool of this invention. It is a perspective view which shows 7th embodiment of the sitting tool of this invention. It is a perspective view which shows 8th embodiment of the sitting tool of this invention. It is a perspective view which shows 9th embodiment of the sitting tool of this invention. It is a perspective view which shows 10th Embodiment of the sitting tool of this invention with the example of its usage. FIG. 12A is a perspective view showing an eleventh embodiment of the sitting tool of the present invention, and FIG. 12B is a sectional view taken along the line CC of the sitting tool of FIG. It is a perspective view which shows 1st embodiment of the chair of this invention and the other chair of this invention. FIG. 14 is a cross-sectional view taken along line B-B in FIG. 13, showing a human body seated on the chair of FIG. 13. It is a perspective view which shows 2nd embodiment of the chair of this invention and the other chair of this invention. It is a perspective view which shows 3rd embodiment of the chair of this invention, and the other chair of this invention. It is the longitudinal cross-sectional view which shows a mode that the human body sat down on the conventional chair, (a) is a longitudinal cross-sectional view which shows the state with which the human body maintained the favorable attitude | position, (b) is the attitude | position of a human body It is a longitudinal cross-sectional view which shows the state which collapsed.

<Sitting>
Hereinafter, first to eleventh embodiments of the sitting tool of the present invention will be described with reference to FIGS. Each embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment.

[First embodiment]
First, a first embodiment of the sitting tool of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a first embodiment of the sitting tool of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG.

  The sitting tool 1 of the present embodiment is used for a chair or the like that is seated in a state where a knee of a human body is bent, and includes a single seat plate 3. The seat plate 3 includes a seat surface 2 on which a person using the sitting tool 1 sits. The seat surface 2 includes a first seat surface 21 and a second seat surface 22. That is, the first seat surface 21 and the second seat surface 22 form one seat surface 2. The second seat surface 22 continues from the first seat surface 21 and extends in the front direction of the sitting tool 1. The second seating surface 22 has an inclined end surface 221 on the first seating surface 21 side and is adjacent to the first seating surface 21 at the end surface 221. In addition, the end surface 221 on the first seating surface 21 side in the second seating surface 22 is formed by having an inclination whose height decreases from the second seating surface 22 side toward the first seating surface 21 side. Yes, part of the second seating surface 22. The second seat surface 22 forms a step that is higher than the first seat surface 21 by the end surface 221 on the first seat surface 21 side. And the 1st seat surface 21 and the 2nd seat surface 22 are provided with a substantially horizontal surface except the level | step-difference part which consists of the end surfaces 221, and are provided substantially mutually parallel. In the present specification, among the second seating surfaces, a substantially horizontal surface that is the main part of the second seating surface and is continuous with the end surface (slope) on the first seating surface side is referred to as a “main surface”. There is.

  In the following, the width direction of the sitting tool 1 is referred to as the left-right direction, and the length direction of the sitting tool 1 (the depth is the direction in which the first seating surface 21, the end surface 221 and the main surface 10 are sequentially passed) is the front-rear direction. Call it. The left-right direction and the front-rear direction are orthogonal to each other. And among the front-back directions, the 2nd seat surface 22 side is called the front direction or the front, and the 1st seat surface 21 side is called the back direction or the back. Further, as will be apparent from the following description, the terms “left-right direction”, “front (direction)”, and “rear (direction)” used in this specification are respectively “left-right direction” viewed from the seated person. "," Front (direction) ", and" rear (direction) ".

  The expression “substantially horizontal surface” includes not only a completely horizontal surface but also a surface with a slight curvature that matches the shape of the buttocks and upper thighs. In particular, when the first seat surface 21 has a slight curvature, the first seat surface 21 is provided with a height difference only in the left-right direction of the sitting tool 1 (the width direction of the sitting tool 1), and the height difference in the front-rear direction. Is preferably not provided. The first seat surface 21 in this case has the same curvature as the arc surface of the large-diameter cylinder extending in the front-rear direction of the sitting tool 1, that is, the first seating surface 21 is curved in the left-right direction of the sitting tool 1, and has a concave arc surface at the center. . An example of the curvature provided on the first seat surface 21 is 1800R (curvature on an arc surface having a curvature radius of 1800 mm), but is not particularly limited. Further, the second seat surface 22 may be provided with the same curvature as the first seat surface 21. In addition, since the curve provided in this way is extremely small, even if the curve is provided only on one of the first seat surface 21 and the second seat surface 22, both of them are substantially parallel. Absent.

  In the present specification, the “upper thigh” refers to a base part of the thigh of the human body.

  The end surface (slope) 221 of the second seat surface 22 on the first seat surface 21 side extends straight in the left-right direction. Further, the first seat surface 21 extends over the entire length of the seat plate 3 in the left-right direction of the sitting tool 1 without being disturbed by the step. In other words, the right and left sides of the first seat surface 21 are not provided with anything that restricts the pelvis 91 of the seated person.

  The seat plate 3 may be formed by combining a plurality of members by bonding them to each other, or may be formed by cutting a single plate-shaped member, or may be a thermoplastic elastomer (TPE) or Rubber or the like may be integrally formed by molding. When the seat plate 3 is formed of a plurality of members, for example, the first seat surface 21 side portion and the second seat surface 22 side portion may be formed of different members. Note that the end surface 221 is not limited to the inclined surface, and is merely provided to form a step on the seating surface 2, so long as it has a height difference.

  Next, the operation of the sitting tool 1 of the present embodiment will be described with reference to FIG. In FIG. 2 and the following description, the skeleton is described so as to come into contact with the sitting tool 1 and the wall surface 8, but this is a schematic for easy understanding. Since there is a body tissue such as muscle or skin between the wall surface 8, the skeleton, the sitting tool 1, and the wall surface 8 are not in direct contact with each other as a matter of course.

  As shown in FIG. 2, the sitting tool 1 has a horizontal surface in a state where the rear edge portion 211 of the first seating surface 21 opposite to the second seating surface 22 is in contact with or in close proximity to the wall surface 8 extending upward. Install on 9 and use. The wall surface 8 here may be a surface extending upward from the vicinity of the rear edge portion 211 of the first seating surface 21 of the sitting tool 1. The horizontal plane 9 here may be a plane extending in a horizontal direction from the wall surface 8 and extending from the seated person's sacrum to the back of the knee (popliteal). At this time, since the seated person sits on the sitting tool 1 with the knee bent at a substantially right angle, the pelvis 91 is not strongly pressed against the wall surface 8 as in the case of sitting with the knee straightly extended. The seating posture can be naturally improved.

  For example, the wall surface 8 and the horizontal surface 9 correspond to the wall surface of the wall and the upper surface of the horizontal plate provided on the wall, respectively, when the sitting tool 1 is used in a chair built on the wall of a building or the like. In addition, when the sitting tool 1 is used in a chair (not shown), the wall surface 8 and the horizontal surface 9 correspond to the front surface of the back plate of the chair (that is, the surface facing the seated person) and the seat surface of the seat plate, respectively. . Further, the wall surface 8 and the horizontal surface 9 correspond to the front surface of the back plate and the seat surface of the seat plate, respectively, formed by reclining when the sitting tool 1 is used in a care bed (not shown) having a reclining mechanism. .

  In this state, when the seated person places his buttocks on the first seat surface 21 and places the upper thigh on the second seat surface 22, the first seat surface 21 supports the seated person's buttocks, The upper surface of the seated person is supported by the two seating surfaces 22. At this time, the pair of left and right sciatic bones 911 and 911 existing at the lower part of the pelvis 91 of the person to be seated abuts on the step formed by the end surface 221, and the step is forward (that is, in the direction toward the second seating surface 22). Movement is restricted. Further, the sacrum 912 existing on the rear part (back side) of the pelvis 91 of the seated person is in contact with the wall surface 8, and the backward movement is restricted by the front surface of the wall surface 8. Therefore, the pelvis 91 is stable in a state in which the pair of sciatic bones 911 and 911 and the sacrum 912 are supported by the step formed by the end surface 221 and the wall surface 8 (hereinafter referred to as “three-point fixed state”). Thereby, it is suppressed that the pelvis 91 moves to the front (2nd seat surface 22 side direction) of the sitting tool 1, and the person who seats takes a posture as shown in FIG.17 (b). As a result, the posture of the seated person becomes naturally good, so that the spine 92 can maintain a good S-curve for a long time, and chronic fatigue to the lower back pain and the waist is reduced. Increased blood flow to the brain will also increase concentration.

  The first seat surface 21 extends over the entire length of the seat plate 3 in the left-right direction of the sitting tool 1 without being hindered by a step. In other words, the right and left sides of the first seat surface 21 are not provided with anything that restricts the pelvis 91 of the seated person. For this reason, the step does not press the left and right sides of the occupant's buttocks, and the first seating surface 21 supports the occupant's buttocks, so that the occupant can sit comfortably without feeling a sense of pressure on the buttocks. Can do. Further, according to the first seat surface 21, even if the seated person's buttocks protrudes from both the left and right sides of the first seat surface 21, the step length in the left-right direction is the distance between the pair of ischials 911, 911. As long as it is equal to or more than, a three-point fixed state can be achieved without any problem. Therefore, for example, the length of the step in the left-right direction can be shortened to be equal to the distance between the pair of ischies 911 and 911, and the sitting tool 1 can be configured compactly.

  As described above, since the first seat surface 21 is substantially horizontal, the pair of sciatic bones 911 and 911 can be reliably locked by the step formed by the end surface 221, so that the pelvis 91 can be stably fixed. . As described above, the term “substantially horizontal” includes not only a horizontal plane but also a very small curved arc surface.

Since the sitting tool 1 is provided with a step formed by the end surface 221 to stabilize the posture of the pelvis 91, the shapes of the first seating surface 21 and the second seating surface 22 are determined depending on the weight of the person sitting on the sitting tool 1. It is desirable that the shape of the end surface 221 and the step height are maintained without being deformed. From such a viewpoint, it is preferable that the seat plate 3 is made of a material that does not easily cause dents due to the weight of the user. As such a material, it is possible to use a high-density fabric with small shrinkage such as wood or canvas, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, or the like.
In addition, when making a material into a thermoplastic elastomer, rubber | gum, or a plastic material, it is preferable that the hardness is 5-120. Here, “hardness” in this specification refers to the hardness obtained by measuring by a method defined in K6253 using an A type durometer defined in K6253 of JIS standard. By setting the hardness within this range, it is possible to prevent the seat plate 3 from being undesirably deformed by using the seat plate 3 for a long period of time while ensuring the comfort of the seated person. From the same viewpoint, the hardness is more preferably 40 to 90. In addition, it is desirable that the hardness of at least the portion on the second seating surface 22 side, particularly the stepped portion formed by the end surface 221 is within the above preferable range, particularly the above further preferable range.

The first seat surface 21 has a function of suppressing the sitting tool 1 from moving forward by being pressed by the weight applied from the buttocks. For this reason, the length of the first seat surface 21 in the front-rear direction, that is, the length L ₁ from the rear edge portion 211 of the first seat surface 21 to the lower end of the end surface 221 is such a length that the weight from the buttocks is sufficiently applied. Need to be. On the other hand, when the longitudinal length L ₁ of the first monodentate surface 21 is too long, it can not be achieved with three-point fixed state of the pelvis 91. From this viewpoint, the length L ₁ in the front-rear direction of the first seat surface 21 is preferably 70 mm or greater and 250 mm or less. More specifically, the length L ₁ in the front-rear direction of the first seating surface 21 is, for example, 100 mm or more and 200 mm or less in order to be able to support adult men and adult women having a standard body shape. Is preferably 150 mm or more and 170 mm or less, and preferably 70 mm or more and 150 mm or less in order to be able to handle, for example, children under elementary school age. Further, the length L ₁ is, for example, because the spine 92 is that as much as possible even sitting position a elderly like bent convexly backward satisfactory is preferably 250mm or less than 200mm .

The second seating surface 22 supports the upper part of the thigh of the seated person with the main surface 10 and has a function of restricting the pair of ischials 911 and 911 from moving forward by forming a step formed by the end surface 221. . Here, longitudinal length of the main surface 10 of the second seating surface 22, that is, the leading edge from 222 to the upper end of the end surface 221 length L ₂ is too long for the second seating surface 22, the second seat surface 22, the upper part of the thigh of the seated person is pressed widely. In this respect, longitudinal length _{L 2} of the main surface 10 of the second seating surface 22 is preferably 150mm or less, more preferably 90mm or less, and more preferably 40mm or less. On the other hand, when the longitudinal length L ₂ of the main surface 10 of the second seating surface 22 is too short, if hardness is used relatively low material, by weight applied from the seat occupant the second seating surface 22 becomes easily deformed On the contrary, when a material having a relatively high hardness is used, the comfort of the seated person is reduced because the portion of the second seating surface 22 bites into the upper part of the thigh of the seated person. In this respect, longitudinal length L ₂ of the main surface 10 of the second seating surface 22 is preferably 3mm or more.

  As described above, the sitting tool 1 locks the pair of sciatic bones 911, 911, and the wall surface 8 locks the sacrum 912, so that the pelvis 91 of the sitting person can be stably fixed. Accordingly, if the sitting tool 1 itself moves in the front-rear direction, the action of stably fixing the pelvis 91 is diminished. Therefore, it is preferable to provide a known anti-slip means (not shown) on the back surface 11 of the sitting tool 1. For example, the non-slip means may be formed by forming the back surface 11 of the sitting tool 1 in a concavo-convex surface, attaching a non-slip sheet to the back surface 11 of the sitting tool 1, or applying an adhesive to the back surface 11 of the sitting tool 1. Etc. can be realized.

If the step formed by the end surface 221 is too high, the person sitting on the sitting tool 1 will feel uncomfortable. On the other hand, if the step formed by the end face 221 is too low, the pair of ischials 911 and 911 can easily get over the step, and the forward movement of the pelvis 91 cannot be sufficiently restricted. From such a viewpoint, the height H _{1 of the} step formed by the end surface 221 is preferably 3 mm or more and 30 mm or less, more preferably 3 mm or more and 20 mm or less, and further preferably 8 mm or more and 15 mm or less.

Further, as the angle θ ₁ formed between the end surface 221 and the first seat surface 21 decreases, the person sitting on the sitting tool 1 feels uncomfortable. On the other hand, if the angle θ ₁ formed between the end surface 221 and the first seat surface 21 is too large, the pair of ischials 911 and 911 can easily get over the step, and the forward movement of the pelvis 91 can be sufficiently restricted. become unable. From such a viewpoint, the angle θ ₁ formed by the end face 221 and the first seating surface 21 is preferably 90 ° or more and 165 ° or less, more preferably 90 ° or more and 140 ° or less, and 90 ° or more. More preferably, it is 120 ° or less.

The length W ₁ in the left-right direction of the end surface 221 (that is, the length in the left-right direction of the first seating surface 21 in the example of FIG. 1) needs to be longer than the distance between the pair of ischials 911, 911, From the viewpoint of obtaining a compact sitting tool 1, it is preferably 100 mm or more and 500 mm or less, more preferably 150 mm or more and 400 mm or less, and further preferably 250 mm or more and 300 mm or less.

Further, in view of the functions of the first seat surface 21 and the end surface 221 as described above, the length L ₁ in the front-rear direction of the first seat surface 21 is set to 0. 0 of the length W ₁ in the left-right direction of the end surface 221. It is preferably 40 to 0.60 times, and more preferably 0.46 to 0.51 times. Similarly, in view of the functions of the main surface 10 and the end surface 221 of the second seating surface 22 as described above, the length L ₂ in the front-rear direction of the main surface 10 of the second seating surface 22 is the left and right of the end surface 221. It is preferably 0.01 to 0.26 times the length W _{1 in} the direction, more preferably 0.01 to 0.10 times.

  The sitting tool 1 according to the first embodiment has a horizontal projection surface formed in a rectangular shape. Therefore, the length in the left-right direction of the sitting tool 1 is determined from the front edge portion 222 of the sitting tool 1. Constant up to the trailing edge 211. However, the shape of the horizontal projection surface of the sitting tool 1 is not limited to a rectangular shape, and can be any shape such as a circle, an ellipse, a trapezoid, a sector, or a combination of some of these shapes. The length of the sitting tool 1 in the left-right direction may vary from the front edge 222 to the rear edge 211 of the sitting tool 1.

  Moreover, the edge part extended in the left-right direction of the sitting tool 1 between the main surface 10 and the end surface 221 of the 2nd seat surface 22 is not curved in the curved surface shape in the cross section shown in FIG. Forming. Thereby, it can suppress that a seated person's sciaticus 911 slips ahead on the said edge part, and rides on the 2nd seat surface 22. FIG.

  According to the first embodiment, the seat occupant comfortably sits only by installing the sitting tool 1 on the horizontal surface 9 with the rear edge 211 of the sitting tool 1 in contact with or in close proximity to the wall surface 8. A three-point fixed state can be achieved, and the seated posture of the seated person can be corrected.

  Further, according to the first embodiment, when the user installs the sitting tool 1 on the horizontal plane 9, the distance between the wall surface 8 and the sitting tool 1 can be adjusted, so that the user can adjust the pelvis. Even if the sizes of 91 are different, a three-point fixed state can be achieved.

  Moreover, the sitting tool 1 is compact compared with a chair, and is excellent in storage property and carrying property.

  From the convenience of such a sitting tool 1, the sitting tool 1 can be used for various chairs. For example, in addition to chairs built in buildings, office chairs, nursing chairs and nursing beds, table chairs, public benches, car seats, aircraft seats, ski lift chairs, wheelchairs, etc. Can be used for

  Further, the end surface 221 of the second seating surface 22 on the first seating surface 21 side may be formed by a concave curved surface recessed forward or a convex curved surface projecting rearward, instead of being formed by an inclined surface.

[Second Embodiment]
Next, a second embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing a second embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The seating tool 1A of the present embodiment includes a seating board 3A having the same configuration as the seating board 3 constituting the seating tool 1 of the first embodiment already described, and an end of the seating board 3A on the first seating surface 21 side. (Back edge portion 211), that is, a back plate 31 extending substantially perpendicularly upward with respect to the seat plate 3A from the end of the first seat surface 21 of the seat plate 3A opposite to the second seat surface 22. Prepare. The seat plate 3A and the back plate 31 may be integrally formed, or may be formed separately and fixed to each other by adhesion, fastening, or the like. Further, the back plate 31 may extend from the end portion of the seat plate 3A on the first seat surface 21 side, and may extend substantially perpendicularly upward with respect to the seat plate 3A only at a part thereof.

Instead of the wall surface 8 in the first embodiment, the front surface of the back plate 31 abuts against and supports the sacrum 912 present at the rear part of the pelvis 91 of the seated person, and restricts the pelvis 91 from moving backward. As a result, the pelvis 91 of the seated person is regulated by the step formed by the end surface 221 so that the forward movement of the pair of sciatic bones 911 and 911 is regulated, and the backward movement of the sacrum 912 is regulated by the front surface of the back plate 31. Stable in state. From the viewpoint of obtaining a compact sitting tool 1A while exhibiting the function of such a back plate 31, the height H ₂ of the back plate 31 with respect to the first seat surface 21 is preferably 50 mm or more and 350 mm or less, More preferably, it is 100 mm or more and 210 mm or less. Further, in view of the function of each of the front and the end 221 of the back plate 31, the height H ₂ of the back plate 31 with respect to the monodentate surface 21, the lateral direction of the length of the end surface 221 (i.e., in the example of FIG. 3 The length of the _first seating surface 21 in the left-right direction) W1 is preferably 0.16 to 1.16 times, and more preferably 0.33 to 0.70 times.

Further, the angle formed between the back plate 31 and the seat plate 3A, that is, the angle θ ₂ formed between the front surface of the back plate 31 and the first seat surface 21 is substantially a right angle so that a three-point fixed state can be achieved. Specifically, it is preferably 90 ° or more and 120 ° or less, and more preferably 90 ° or more and 95 ° or less.

It should be noted that it is necessary to accommodate the seated person's entire buttocks between the end surface 221 and the front surface of the back plate 31 so that a three-point fixed state can be achieved. From this viewpoint, the length L ₃ in the front-rear direction of the first seat surface 21 is preferably 70 mm or greater and 250 mm or less. More specifically, the length L ₃ in the front-rear direction of the first seating surface 21 is, for example, 100 mm or more and 200 mm or less in order to be compatible with adult men and adult women having a standard body shape. Is preferably 150 mm or more and 170 mm or less, and preferably 70 mm or more and 150 mm or less in order to be able to handle, for example, children under elementary school age. Further, the length L ₃ is, for example, because the spine 92 is that as much as possible even sitting position a elderly like bent convexly backward satisfactory is preferably 250mm or less than 200mm . Further, in view of the functions of the first seat surface 21 and the back plate 31, the length L ₃ in the front-rear direction of the first seat surface 21 is 0 of the height H ₂ of the back plate 31 with respect to the first seat surface 21. It is preferably .70 to 0.90 times, and more preferably 0.75 to 0.85 times.

  According to the second embodiment, in addition to the effects of the first embodiment, even when there is no wall surface extending substantially perpendicular to the horizontal plane to be seated, the back plate 31 causes the first seat surface 21 to be On the other hand, a three-point fixed state can be achieved by forming a wall surface extending substantially perpendicularly upward.

Although not shown, the seat plate 3A is composed of a lower seat plate that forms the first seat surface 21 and an upper seat plate that is provided on the lower seat plate and that forms the second seat surface 22. configured, by fixing the upper seating plate from moving in the longitudinal direction in the lower seating plate, it may be provided adjusting means for adjusting the longitudinal length L ₃ of the monodentate surface 21. Thereby, even if the magnitude | size of the pelvis 91 changes with users, a three-point fixed state can be achieved. Here, the adjusting means can be realized, for example, by fixing the lower seat plate and the upper seat plate with a hook-and-loop fastener.

  Further, the seat plate 3A and the back plate 31 are configured separately, and both are connected by a hinge (not shown) or the like so that the back plate 31 can be tilted forward or backward with respect to the seat plate 3A. May be. Thereby, 1 A of sitting implements will be comprised by folding type, and a stowability improves.

[Third embodiment]
Next, a third embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 4 is a perspective view showing a third embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  In the sitting tool 1B of the present embodiment, the first seat surface 21B that supports the seated person's buttocks is formed as the upper surface of the rear seat plate 12, and the second seat surface 22B that supports the upper part of the thigh of the seated person is formed in the left-right direction. It is formed as the upper surface of the concavo-convex sheet 13 formed by connecting a plurality of extending cylindrical fillers 224 in the front-rear direction. The rear seat plate 12 and the concavo-convex sheet 13 are connected to each other by sewing or bonding them to form the seat plate 3B.

It is preferable that the rear seat plate 12 having the first seat surface 21B is made of a material that hardly causes dents due to the weight of the user. As such a material, it is possible to use a high-density fabric with small shrinkage such as wood or canvas, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, or the like.
In addition, when making a material into a thermoplastic elastomer, rubber | gum, or a plastic material, it is preferable that the hardness is 5-120, and it is further more preferable that it is 40-90. By setting the hardness within the above preferable range, particularly the above preferable range, the seat plate 3B is undesirably used by using the seat plate 3B over a long period of time while ensuring the comfort of the seated person appropriately. Deformation can be prevented.

  The cylindrical filler 224 is formed by inserting a core material 225 into the internal space of the cylinder 223. The cylindrical fillers 224 are connected to each other by sewing or bonding the cylinders 223 together. The cylinder 223 is formed of a material having a lower hardness than the core material 225, for example, a cloth. The core material 225 is made of a material having such a strength as not to be crushed by the weight of the person sitting, such as a hard rubber bar, a rubber tube, and a wooden bar.

  In addition, the core material 225 may have either a column shape or a polygonal column shape, and the uneven shape of the second seating surface 22B is formed according to the shape and size thereof.

  A portion of the internal space of the cylinder 223 that is not occupied by the core material 225 can be filled with a cushion material. As such a cushioning material, a foamed material such as cotton or sponge, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, a high-density fabric, or the like having cushioning properties can be used. Thereby, a seated person's comfort can be improved.

A step is formed at a position higher than the first seat surface 21B by the end surface 221B on the first seat surface 21B side in the second seat surface 22B. Therefore, the sitting tool 1B of the present embodiment also includes a step that regulates the movement of the pair of sciatic bones 911 and 911 of the person who sits down. Step height _{H 3} of the end surface 221B, similarly to the step height _{H 1} of the end face 221 of the seat device 1 according to the first embodiment, more that preferably at 3mm than 30mm or less, 3mm or more 20mm or less Preferably, it is 8 mm or more and 15 mm or less. Further, due to the core material 225 existing inside the cylindrical filler 224, this step is not lost even if the user of the sitting tool 1B is seated.

  Note that the sitting tool 1B according to the third embodiment has a trapezoidal horizontal projection surface. Therefore, the length of the sitting tool 1B in the left-right direction is from the front edge 222B toward the rear edge 211B. It is gradually decreasing. However, the shape of the horizontal projection surface of the sitting tool 1B is not limited to a trapezoid, and can be any shape such as a rectangle or a sector.

  According to the third embodiment, since the cylinder 223 of the cylindrical filler 224 is made of a relatively soft material, the connecting portion between the cylindrical fillers 224 has flexibility. Therefore, in addition to the effects of the first embodiment, when the sitting tool 1B is not used, it is possible to store the concavo-convex sheet 13 by winding it in the front-rear direction or folding it at the connecting portion of the concavo-convex sheet 13.

  In addition, according to the third embodiment, since the second seat surface 22B is formed by the surface of the cylinder 223 formed of a relatively soft material, the comfort of the seated person can be improved.

  The second seating surface 22B may be formed by a single cylindrical filler 224.

  Further, the second seat surface 22B may be configured using a hollow member such as a rubber hose instead of the cylindrical filler 224.

  Further, instead of extending the core material 225 straight in the left-right direction, the core material 225 may be curved or bent so as to be convex in the forward direction or the backward direction. Thereby, according to the shape of the core material 225, the cylindrical filler 224 is also curved or bent so as to be convex in the forward direction or the backward direction.

  Further, the back plate 31 of the sitting tool 1A according to the second embodiment may be provided on the rear edge portion 211B of the sitting tool 1B.

[Fourth embodiment]
Next, a fourth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 5 is a perspective view showing a fourth embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1C of this embodiment is provided with a surface member 4 having cushioning properties on the upper surface of a sitting board 3C having the same configuration as the sitting board 3 constituting the sitting tool 1 of the first embodiment already described. is there. That is, the first seat surface 21C and the second seat surface 22C in the sitting tool 1C are formed by the upper surface of the surface member 4 having cushioning properties. For this reason, 1 C of sitting tools of this embodiment can improve the comfort of the person who seats, and can reduce the fatigue | exhaustion feeling of a buttocks when sitting for a long time. In the description of this embodiment, the description of the seat plate 3C is omitted.

  The surface member 4 is preferably made of, for example, a cushion, a foam such as a cloth, a high-density fabric, or a sponge, a plastic material such as rubber, a thermoplastic elastomer (TPE), or an EVA resin.

Further, the thickness of the surface member 4 is substantially constant over the entire surface member. Therefore, the seat surface 2C formed by the surface member 4 is substantially parallel to the upper surface of the seat plate 3C. Accordingly, the step height H _{4 of} the end surface 221C and the preferred value of the angle θ ₃ formed by the end surface 221C and the first seating surface 21C are respectively the step height H ₁ of the end surface 221 in the sitting tool 1 according to the first embodiment. Or it becomes the same as angle (theta) ₁ which the end surface 221 and the 1st seat surface 21 make. The same applies to the length of the first seat surface 21C in the front-rear direction, the length of the main surface 10C in the front-rear direction, the length of the end surface 221C in the left-right direction, and the ratio between them.

In the sitting tool of the present invention, it is necessary that the step provided on the seating surface is maintained when the user is seated. Therefore, material and thickness T ₁ of the surface member 4, so that the step of desired height after the deformed end face 221C by weight of a person seated is formed, is adjusted. A preferable value of the thickness T ₁ of the surface member 4 is _{1 to} 15 mm.

  The sitting tool 1C has a horizontal projection surface formed in a rectangular shape. However, the shape of the horizontal projection surface of the sitting tool 1C is not limited to a rectangular shape, and may be any shape such as a circle, an ellipse, a trapezoid, a sector, or a combination of some of these shapes.

  According to the fourth embodiment, in addition to the effects of the first embodiment, the comfort of the seated person can be improved, and the fatigue of the buttocks can be reduced when sitting for a long time.

  Note that the back plate 31 of the sitting tool 1A according to the second embodiment may be provided on the rear edge portion 211C of the sitting tool 1C.

[Fifth embodiment]
Next, a fifth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing a fifth embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1D of this embodiment is comprised from one seat board 3D similarly to the sitting tool 1 of 1st embodiment. The seat plate 3D is different from the sitting tool 1 of the first embodiment in that the seat plate 3D includes a first seat surface 21D that is convex in an arc shape in the direction of the second seat surface 22D. Accordingly, an end surface 221D on the first seating surface 21D side of the second seating surface 22D, which is a stepped portion, is formed to be curved so as to protrude forward when viewed in plan. By providing such a step, the sitting tool 1D of the present embodiment can be fixed so as to wrap the pair of sciatic bones 911 and 911 by the step. Absorbing can improve the sitting posture of the seated person more effectively, and the level difference along the contour shape of the sciatic bone in a plan view allows the seated person to sit more comfortably. it can. At this time, as a suitable value of the curvature radius of the edge part of the front side of end surface 221D when planarly viewed, for example, 290 to 330 mm is cited.

  Similar to the sitting tool 1 of the first embodiment, the first seating surface 21D extends without being interrupted by the step over the entire length of the seat plate 3D in the left-right direction of the sitting tool 1D.

  The sitting tool 1D has a horizontal projection surface formed in a rectangular shape. However, the shape of the horizontal projection surface of the sitting tool 1D is not limited to a rectangular shape, and may be any shape such as a circle, an ellipse, a trapezoid, a sector, or a combination of some of these shapes.

  According to the fifth embodiment, in addition to the effects of the first embodiment, the slightly different ischial position difference depending on the individual difference of the seated person is absorbed, and the seated posture of the seated person is improved more effectively. In addition, the step can be more conformed to the contour shape of the ischia in plan view, so that the seated person can sit more comfortably.

  Such an effect can be obtained if the step, that is, the end surface 221D on the first seating surface 21D side of the second seating surface 22D is formed to be convex forward when viewed in plan. It is. Accordingly, the shape in which the end surface 221D is convex forward is not limited to the arc shape as described above, and may be, for example, a U shape. Alternatively, the end surface 221D on the first seating surface 21D side of the second seating surface 22D may be bent so as to be convex in a polygonal shape in the forward direction when viewed in plan.

  Further, the back plate 31 of the sitting tool 1A according to the second embodiment may be provided on the rear edge portion 211D of the sitting tool 1D.

[Sixth embodiment]
Next, a sixth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 7 is a perspective view showing a sixth embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1E of the present embodiment forms the seat plate 3E by folding a thick fabric 5 having a small contractibility such as a cushion or a mat. As long as it can be folded, the cushion or mat can be made of, for example, a cloth, a high-density fabric, a foamed material such as sponge, a plastic material such as a thermoplastic elastomer (TPE), rubber, EVA resin, or the like. The seat plate 3E has a first seat surface 21E that supports the seated person's buttocks and a second seat surface 22E that supports the upper part of the seated person's thigh. Specifically, the sitting tool 1E folds the thick dough 5 in the length direction and, further, folds the crease part in the rearward direction about half of the sitting tool 1E. It is fixed by bonding or sewing. Thereby, the 2nd seat surface 22E has the convex curved surface 221E which protrudes back as an end surface by the side of the 1st seat surface 21E.

The convex curved surface 221E has a function of forming a step with respect to the first seating surface 21E and restricting the pair of sciatic bones 911, 911 of the seated person to move forward. In this respect, the step height _{H 5} of the convex surface 221E is similar to the step height _{H 1} of the seat member 1 of the end face 221 of the first embodiment, is preferably 3mm or more 30mm or less, 3mm or more 20mm or less It is more preferable that it is 8 mm or more and 15 mm or less.

  In addition, as for the sitting tool 1E, the shape of the horizontal projection surface is formed in the rectangular shape. However, the shape of the horizontal projection surface of the sitting tool 1E is not limited to a rectangular shape, and an arbitrary shape such as a trapezoid is possible.

  According to the sixth embodiment, in addition to the effects of the first embodiment, the fabric 5 can be folded to form a step, so that the sitting tool 1E can be easily manufactured. Further, since the seat surface of the sitting tool 1E is formed of a relatively soft material such as a cushion or a mat, the comfort of the seated person can be improved.

  Note that the back plate 31 of the sitting tool 1A according to the second embodiment may be provided on the rear edge portion 211E of the sitting tool 1E.

[Seventh embodiment]
Next, a seventh embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 8 is a perspective view showing a seventh embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1F of the present embodiment includes a seat plate 3F having the same shape as the sitting tool 1 of the first embodiment. And the sitting tool 1F has the seat surface 2F which consists of the 1st seat surface 21F which supports a seated person's buttocks, and the 2nd seat surface 22F which supports a seated person's upper thigh. The second seating surface 22F has an end surface 221F and a main surface 10F.

  Here, in the sitting tool 1F, the end surface 221F and the front and rear portions thereof are formed of a hard material seat plate 230F made of a relatively hard material, and the rear portion of the hard material seat plate 230F is formed of a hard material seat. It is formed of a soft material seat plate 232F made of a relatively soft material softer than the plate 230F. The hard material seat plate 230F and the soft material seat plate 232F are fixed by adhering the contact surfaces with an adhesive or sewing them together. The hard material seat plate 230F and the soft material plate 232F constitute one seat plate 3F.

The upper surface of the hard material seat plate 230F has an end surface 221F at an intermediate portion in the front-rear direction. Then, the upper surface of the hard material seat plate 230F is a portion on the rear side of the end surface 221F, forms the first seat surface 21F together with the upper surface of the soft material seat plate 232F, and other portions (the end surface 221F and the main surface 10F). The second seating surface 22F is formed. The material of the hard material seat plate 230F is preferably a material that is unlikely to cause dents due to the weight of the human body, like the seat plate 3 constituting the sitting tool 1 according to the first embodiment. As such a material, it is possible to use a high-density fabric with small shrinkage such as wood or canvas, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, or the like.
In addition, when making a material into a thermoplastic elastomer, rubber | gum, or a plastic material, it is preferable that the hardness is 5-120, and it is further more preferable that it is 40-90. By setting the hardness within the above preferable range, particularly the above preferable range, the seat plate 3F can be used over a long period of time while ensuring the comfort of the seated person, so that the end surface 221F of the seat plate 3F can be used. In addition, it is possible to prevent the seat plate 3F from being undesirably deformed at the front and rear portions thereof.

  The material of the soft material seat plate 232F is preferably softer than the hard material seat plate 230F and has a cushioning property. As such a material, for example, a cloth, a high-density cloth, a foamed material such as a sponge, a rubber material, a plastic material such as a thermoplastic elastomer (TPE), an EVA resin, or the like having cushioning properties can be used.

  When the sitting tool 1F is used, the forward movement of the pair of sciatic bones 911 and 911 of the seated person is restricted by the end face 221F. At this time, on the front side and the rear side of the end surface 221F, the upper thigh and the sciatic bone of the seated person are supported by the hard material seat plate 230F, respectively. Thereby, the three-point fixed state of the pelvis 91 can be achieved. In addition, since both the upper thigh and the sciatic bone of the seated person are supported by the hard material seat plate 230F, the step height of the end surface 221F can be made constant before and after the weight of the seated person is applied.

  Further, at this time, the seat of the seated person is supported by the soft material seat plate 232F. Thereby, the comfort in the buttocks of the seated person can be improved.

Therefore, the length L ₈ in the front-rear direction of the portion extending rearward from the end surface 221F of the hard material seat plate 230F is preferably a length sufficient to support the pair of ischbones 991, 991. Is preferably 10 mm or more and 100 mm or less, and more preferably 30 mm or more and 50 mm or less.

The preferred values of the length L ₄ in the front-rear direction of the first seat surface 21F and the length L ₃ in the front-rear direction of the main surface 10F of the second seat surface 22F are those of the sitting tool 1 described in the first embodiment. The length L ₁ in the front-rear direction of the first seat surface 21 and the length L ₂ in the front-rear direction of the main surface 10 of the second seat surface 22 are the same.

  According to the seventh embodiment, in addition to the effects of the first embodiment, the step height of the end surface 221F can be maintained constant before and after the seating tool 1F is subjected to the weight of the seated person while sitting. The comfort of the person's buttocks can be improved.

  Note that, similarly to the sitting tool 1D (FIG. 6) according to the fifth embodiment, the end surface 221F on the first seating surface 21F side of the second seating surface 22F may be configured to protrude forward.

  Further, the back plate 31 of the sitting tool 1A according to the second embodiment may be provided on the rear edge portion 211F of the sitting tool 1F.

[Eighth embodiment]
Next, an eighth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 9 is a perspective view showing an eighth embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1K of the present embodiment is composed of one seat plate 3K, similar to the sitting tool 1D of the fifth embodiment, and the seat plate 3K is convex in an arc shape in the direction of the second seating surface 22K. The first bearing surface 21K is provided. Accordingly, an end surface 221K on the first seating surface 21K side of the second seating surface 22K, which becomes a stepped portion, is formed to be curved or bent so as to be convex forward when viewed in plan. By providing such a step, the sitting tool 1K of the present embodiment can be fixed so as to wrap the pair of ischials 911 and 911 by the step, and the difference in the sciatic position slightly different depending on the individual difference of the seated person. Absorbing can improve the sitting posture of the seated person more effectively, and the level difference along the contour shape of the sciatic bone in a plan view allows the seated person to sit more comfortably. it can. At this time, a suitable value of the radius of curvature of the edge on the front side of the end surface 221K when viewed in plan is, for example, 290 to 330 mm.

  In addition, the sitting tool 1K has a horizontal projection plane whose shape is an ellipse having a long axis in the left-right direction, and the lengths of the first seating surface 21K and the second seating surface 22K in the front-rear direction are the center in the left-right direction. It differs from the sitting tool 1D of the fifth embodiment in that it increases as it approaches the line (the chain line in FIG. 9).

The main surface 10K (the second seating surface 22K excluding the end surface 221K on the first seating surface 21K side) of the second seating surface 22K is formed by a pair of left and right regions 301, 301 excluding the central region 300 in the left-right direction. Support the upper thigh. When the length in the front-rear direction in the left and right side regions 301, 301 of the main surface 10K is long, the upper part of the thigh of the seated person is pressed against the main surface 10K and the comfort of the seated person is reduced. Accordingly, the length in the front-rear direction in the left and right side regions 301, 301 of the main surface 10K is preferably shorter. From this point of view, the main surface 10K of the second seating surface 22K, the left and right sides of the region 301 and 301, the maximum length _{L 10} of the front-rear direction, of the monodentate surface 21K, the maximum length _{L 11} of the longitudinal It is short. According to this configuration, the upper part of the thigh of the seated person is prevented from being widely pressed against the second seating surface 22K, so that the seated person can sit comfortably for a long time, and the sitting tool 1K is configured to be extremely compact. be able to.

Here, the center region 300 in the left-right direction on the main surface 10K of the second seating surface 22K is located between the pair of upper thighs of the seated person and sandwiches the center line in the left-right direction of the main surface 10K. We shall refer to a region having a first width of 4 minutes for the lateral direction of the length W ₅ of the main surface 10K. Since the central region 300 of the main surface 10K is a region where the weight from the upper part of the thigh of the seated person is not so much, the length in the front-rear direction may be long. However, from the viewpoint of compactness, the longitudinal length of the main surface 10K, over the entire right and left direction, be shorter than the longitudinal direction of the maximum length L ₁₁ of the monodentate surface 21K, further preferable.

The first seating surface 21 </ b> K has a function of preventing the sitting tool 1 </ b> K from moving forward by being pressed by the weight applied from the buttocks. Therefore, the front-rear direction of the maximum length L ₁₁ of the monodentate surface 21K is required weight from the buttocks is the applied length such sufficient. On the other hand, when the front-rear direction of the maximum length L ₁₁ of the monodentate surface 21K is too long, it can not be achieved with three-point fixed state of the pelvis 91. From this point of view, the longitudinal direction of the maximum length _{L 11} of the monodentate surface 21K is preferably 70mm or more 250mm or less. More specifically, the maximum length L ₁₁ in the front-rear direction of the first seating surface 21K is, for example, 100 mm or more and 200 mm or less in order to be able to support adult men and adult women having a standard body shape. It is preferably 150 mm or more and 170 mm or less, and for example, 70 mm or more and 150 mm or less is preferable in order to be able to cope with children such as elementary school students or less. Further, the maximum length L ₁₁ is, for example, because the spine 92 is that as much as possible even sitting position a elderly like bent convexly backward good, it is 250mm or less than 200mm preferable.

The second seating surface 22K supports the upper part of the thigh of the seated person in the regions 301 on both the left and right sides of the main surface 10K, and forms a step composed of the end surface 221K on the first seating surface 21K side. It has a function of restricting 911 from moving forward. Here, the main surface 10K of the second seating surface 22K, the left and right sides of the region 301, the maximum length L ₁₀ of the front-rear direction, and not involved in achieving a three-point fixed state, also, the maximum length When the L ₁₀ is long, undesirable that amount, it becomes possible to reduce the comfort of the seated person upper thigh wide pressed against by the occupant in the second seat surface 22K, from the viewpoint of compactness of the seat member . Therefore, the maximum length _{L 10} is shorter it is preferable, it is preferable that in particular is 150mm or less, more preferably 90mm or less, and more preferably 40mm or less. On the other hand, if the maximum length L ₁₀ is too short, the case of using a relatively low material hardness, the second seat surface 22K by weight applied from the seat occupant is likely to deform, using a relatively high material hardness conversely In this case, the comfort of the seated person is reduced because the portion of the second seating surface 22K bites into the upper part of the thigh of the seated person. From this point of view, the length _{L 10} is preferably 3mm or more.

The second seat surface 22K, the lateral direction length _{W 5} of the end surface 221K of the monodentate surface 21K side, along which should be greater than the spacing between the pair of sciatic 911, 911, obtain a compact zag 1K From this viewpoint, it is preferably 100 mm or more and 500 mm or less, more preferably 150 mm or more and 400 mm or less, and further preferably 250 mm or more and 300 mm or less.

  The first seat surface 21K extends over the entire length of the seat plate 3K in the left-right direction of the sitting tool 1K without being obstructed by the step. In other words, the right and left sides of the first seat surface 21K are not provided with anything that restricts the pelvis 91 of the seated person. For this reason, the step does not press the left and right sides of the occupant's buttocks, and the first seating surface 21K supports the occupant's buttocks so that the occupant can sit comfortably without feeling a sense of pressure on the buttocks. Can do. Furthermore, according to such a first seating surface 21K, even if a seated person's buttocks protrudes from both the left and right sides of the first seating surface 21K, the length of the step in the left-right direction is equal to or equal to the distance between the pair of ischials. As long as it is more than that, the three-point fixed state can be achieved without problems. Therefore, for example, the length of the step in the left-right direction can be shortened to be equal to the distance between the pair of ischies, and the sitting tool 1K can be configured compactly.

The end surface 221K on the first seating surface 21K side of the second seating surface 22K forms a step with respect to the first seating surface 21K, and has a function of restricting the pair of seated bones 911, 911 from moving forward. Have. In this respect, the step height _{H 11} of the end face 221K is similar to the step height _{H 1} of the end face 221 of the seat device 1 according to the first embodiment, preferably at 3mm than 30mm or less, at 3mm or 20mm or less More preferably, it is 8 mm or more and 15 mm or less.

Except for the matters described above, the size and material of the sitting tool 1K are the same as those of the sitting tool 1 of the first embodiment, and thus the description thereof is omitted. Note that the value of the angle formed by the end surface 221K and the first seating surface 21K is a value measured in the longitudinal section of the sitting tool 1K passing through the center line in the left-right direction of the seating plate 3K (the one-dot chain line in FIG. 9). The value is the same as the angle θ ₁ formed in the first embodiment.

  According to the eighth embodiment, in addition to the effects of the fifth embodiment, the upper part of the thigh of the seated person can be prevented from being widely pressed against the second seating surface 22K, and the seated person can sit comfortably for a long time. In addition, the sitting tool 1K can be configured to be extremely compact.

  Note that, similarly to the sitting tool 1A according to the second embodiment, a back plate may be provided on the rear edge portion 211K of the sitting tool 1K.

[Ninth embodiment]
Next, a ninth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 10 is a perspective view showing a ninth embodiment of the sitting tool of the present invention. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1M of this embodiment includes a seat plate 3M and a support body 157 that is installed on a horizontal surface 9 such as a seat surface of a chair (not shown) and supports the seat plate 3M.

  The seat plate 3M has the same structure as the seat plate 3K constituting the sitting tool 1K according to the eighth embodiment shown in FIG. Since the shape, size, and material of the seat plate 3M are the same as those of the seat plate 3K, description thereof is omitted.

  The support body 157 is placed on the horizontal plane 9. The support body 157 includes a bottom plate 157A on which the seat plate 3M is placed, and a back plate 157B extending from the end of the bottom plate 157A on the first seating surface 21M side of the seat plate 3M substantially perpendicularly to the bottom plate 157A. And have. The bottom plate 157A and the back plate 157B are integrally formed. The back plate 157B may extend from the end of the bottom plate 157A on the first seating surface 21M side of the seat plate 3M, and may extend substantially perpendicular to the bottom plate 157A only at a part thereof.

  The bottom plate 157 </ b> A of the support body 157 has a function of supporting the seat plate 3 </ b> M on the upper surface thereof while being placed on the horizontal surface 9. The seat plate 3M is fixed on the bottom plate 157A of the support body 157 using an adhesive or a fastener. Here, as shown in FIG. 10, when the shape of the horizontal projection surface of the bottom plate 157A is formed substantially the same as the shape of the horizontal projection surface of the seat plate 3M, a compact sitting tool 1M can be obtained.

The back plate 157B of the support body 157 has a function of restricting the movement of a person sitting on the seat plate 3M to the rear of the sacrum 912. As a result, the pelvis 91 of the seated person is supported by the step of the end surface 221M on the first seating surface 21M side of the second seating surface 22M of the seat plate 3M while the forward movement of the pair of sciatic bones 911 and 911 is restricted. The back movement of the sacrum 912 is restricted by the back plate 157B of the body 157, and a three-point fixed state is achieved. From this viewpoint, the angle formed between the bottom plate 157A and the back plate 157B, that is, the angle θ ₇ formed between the upper surface of the seat plate 157A and the front surface of the back plate 157B is preferably substantially perpendicular, specifically 90 °. The angle is preferably 120 ° or less and more preferably 90 ° or more and 95 ° or less. Also, when placing the seat plate 3M on the support 157, the height _{H 12} of the back plate 157B is for the first monodentate surface 21M, it preferably at least 50mm 350mm or less, and 100mm or more 210mm or less Is more preferable.

  The support body 157 is preferably made of a material that is unlikely to cause dents in the bottom plate 157A or the back plate 157B to fall backward depending on the weight of the user. As such a material, plastic materials such as wood and fiber reinforced plastic (FRP) can be used. By configuring the support 157 in this manner, for example, the seat plate of the chair (not shown) is formed of a soft material, or the back plate of the chair is greatly inclined to the back. Even if the three-point fixed state cannot be achieved even if it is placed on the seat surface, the support plate 157 is placed on the seat surface of the chair, and the seat plate 3M is installed on the support body 157. A point-fixed state can be achieved.

  For example, when using the sitting tool 1M using a chair, a person who sits down makes the back plate 157B of the support 157 face the wall surface 8 such as the front surface of the back plate of the chair (not shown), The sitting tool 1M is placed on the horizontal surface 9. At this time, it is preferable to align the front edge portion 222M of the seat plate 3M with the front edge portion of the horizontal surface 9 opposite to the wall surface 8. Thereby, when the human body is seated on the sitting tool 1M, it is possible to avoid the portion on the back side of the knee of the thigh from being placed on the horizontal plane 9, and to improve the comfort of the seated person.

The end face 221M of the monodentate surface 21M side of the second seat surface 22M of the lower end portion and a seat plate 3M of the back plate 157B of the support 157, the maximum distance _{L 12} front-rear direction of the seat device 1M is a three-point fixed state Is preferably 70 mm or more and 250 mm or less. More specifically, the distance _{L 12} is, for example, in order to enable corresponding adult male and adult female with standard type is preferably 100mm or more 200mm or less, is 150mm or more 170mm or less More preferably, for example, 70 mm or more and 150 mm or less is preferable in order to be able to cope with a child or the like of an elementary school student or less. Further, the distance L ₁₂ is, for example, because the spine 92 is that as much as possible even sitting position a elderly like bent convexly backward satisfactory is preferably 250mm or less than 200 mm.

  According to the ninth embodiment, for example, the seat plate of the chair (not shown) is formed of a soft material, the back plate of the chair is greatly inclined backward, and further, the chair is not used. Even when 3M is placed on a horizontal surface such as a seat surface of a chair and the three-point fixed state cannot be achieved, the three-point fixed state can be achieved only by installing the sitting tool 1M on the horizontal surface.

  Further, according to the ninth embodiment, the sitting tool 1M can be configured to be smaller than the chair, so that the storage property is good and the carrying is convenient.

Note that the seat plate 3M and the support 157 may be configured separately without being fixed to each other. Accordingly, when the user is seated, the lower end portion of the back plate 157B of the support body 157 and the first seat surface 21M side of the second seat surface 22M of the seat plate 3M according to the size of his / her pelvis. the end surface 221M, can be adjusted in the longitudinal direction up to a distance _{L 12} of the seat member 1M. Accordingly, it is possible to cope with a slightly different size of the pelvis 91 depending on individual differences of seated persons. In this case, anti-slip means (not shown) may be provided on the back surface of the seat plate 3M. The anti-slip means can be realized, for example, by forming the back surface on an uneven surface or attaching an anti-slip sheet to the back surface. Alternatively, position adjusting means (not shown) for adjusting the position of the seat plate 3M in the front-rear direction with respect to the support body 157 may be provided instead of providing the anti-slip means. The position adjusting means, for example, forms a slit extending in the front-rear direction on the bottom plate 157A of the support body 157 at the center in the left-right direction of the support body 157, and a protrusion extending downward from the bottom surface of the seat plate 3M on the seat plate 3M. It can be realized by providing the projection so that the projection can be displaced in the front-rear direction in the slit. According to the position adjusting means, while allowing adjustment of the distance L _12, it is possible to prevent the seat plate 3M is displaced in the lateral direction undesirably with respect to the support 157.

  Further, anti-slip means (not shown) may be provided on the back surface of the bottom plate 157A of the support 157. The anti-slip means can be realized, for example, by forming the back surface on an uneven surface, attaching a non-slip sheet to the back surface, or applying an adhesive to the back surface.

  Moreover, the seat board 3 (FIGS. 1-2) which comprises the sitting tool 1 which concerns on 1st embodiment, The seat board 3B (FIG. 4) which comprises the sitting tool 1B which concerns on 3rd embodiment, and 4th embodiment. A seat plate 3C (FIG. 5) constituting the sitting tool 1C, a seat plate 3D (FIG. 6) constituting the sitting tool 1D according to the fifth embodiment, and a seat plate 3E (see FIG. 6) constituting the sitting tool 1E according to the sixth embodiment. 7) or a seat plate 3F (FIG. 8) constituting the seat 1F according to the seventh embodiment may be used instead of the seat plate 3M of the seat 1M according to this embodiment.

[Tenth embodiment]
Next, a tenth embodiment of the sitting tool of the present invention will be described with reference to FIG. FIG. 11: is a perspective view which shows 10th Embodiment of the sitting tool of this invention with the example of its usage. In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1J of the present embodiment is installed on the seat plate 3J, the seat surface of the chair 156, and is provided vertically on the front surface of the back plate 152B of the support member 152 and the support member 152 that supports the seat plate 3J. And a pair of cushions 153, 154.

  The seat plate 3J has the same structure as the seat plate 3K constituting the sitting tool 1K according to the eighth embodiment shown in FIG. Since the shape, size, and material of the seat plate 3J are the same as those of the seat plate 3K, description thereof is omitted.

  The support body 152 is placed on the seat surface of the chair 156. The support body 152 includes a bottom plate 152A on which the seat plate 3J is placed, and a back plate 152B extending from the end portion of the bottom plate 152A on the first seating surface 21J side of the seat plate 3J substantially perpendicularly to the bottom plate 152A. The bottom plate 152A and the back plate 152B are integrally formed with each other. Note that the back plate 152B may extend from the end of the bottom plate 152A on the first seating surface 21J side of the seat plate 3J and may extend substantially perpendicularly upward with respect to the bottom plate 152A only at a part thereof.

  The bottom plate 152 </ b> A of the support body 152 has a function of supporting the seat plate 3 </ b> J on the upper surface thereof while being placed on the seat surface of the chair 156. From this viewpoint, it is preferable that the upper surface of the bottom plate 152A has an area equal to or larger than the seat plate 3J.

The back plate 152B of the support body 152 has a function of restricting the movement of a person sitting on the seat plate 3J to the rear of the sacrum 912 via the lower cushion 153. As a result, the pelvis 91 of the seated person is restricted from moving forward by the pair of sciatic bones 911 and 911 by the step formed by the end surface 221J of the second seating surface 22J of the seat plate 3J on the first seating surface 21J side. The back movement of the sacrum 912 is restricted by the back plate 152B of the support body 152 via the side cushion 153, and a three-point fixed state is achieved. From this viewpoint, the angle formed between the bottom plate 152A and the back plate 152B, that is, the angle θ ₅ formed between the upper surface of the bottom plate 152A and the front surface of the back plate 152B is preferably substantially perpendicular, specifically, 90 °. The angle is preferably 120 ° or less and more preferably 90 ° or more and 95 ° or less. Further, the height of the back plate 152B with respect to the first seating surface 21J when the seat plate 3J is placed is preferably 50 mm or greater and 350 mm or less, and more preferably 100 mm or greater and 210 mm or less.

  The support 152 is preferably made of a material that is unlikely to cause dents in the bottom plate 152A or the back plate 152B to fall backward depending on the weight of the user. As such a material, plastic materials such as wood and fiber reinforced plastic (FRP) can be used. By configuring the support 152 in this manner, the seat plate 3J can be used as the seat of the chair 156, such that the seat plate 156A of the chair 156 is formed of a soft material, or the back plate 156B of the chair 156 is greatly inclined backward. Even if the three-point fixed state cannot be achieved even when placed on the surface, the three-point fixed state can be achieved.

  The seat plate 3J is fixed on the bottom plate 152A of the support 152 by a fixing means 155 such as an adhesive.

  A pair of cushions 153 and 154 are vertically attached to the front surface of the back plate 152B of the support body 152, that is, the surface facing the human body. The rear surfaces of the cushions 153 and 154 are fixed to the back plate 152B of the support body 152 with an adhesive or the like. The front surfaces of the cushions 153 and 154 are preferably parallel to the front surface of the back plate 152B of the support 152.

  The lower cushion 153 is in contact with the sacrum 912 of the person who is seated, and fixes the position of the sacrum 912, and has a function of mitigating an impact when the sacrum 912 is pressed against the back plate 152B. From this viewpoint, the lower cushion 153 is 50 mm or more and 350 mm from the first seating surface 21J of the seat plate 3J when the seat plate 3J is placed so that the lower cushion 153 can contact the sacrum 912 of the person seated on the seat plate 3J. It is preferable to arrange within the following height range, and more preferably within the height range of 100 mm to 210 mm.

  The upper cushion 154 has a function of urging the seated person to maintain the natural S-shaped curve of the spine 92 and also mitigating an impact when the spine 92 is pressed against the back plate 152B.

  The seat plate 3J has an elliptical shape with a horizontal projection surface that is long in the left-right direction. However, the shape of the horizontal projection surface of the seat plate 3J is not limited to an ellipse, and can be any shape such as a rectangle, a circle, a trapezoid, a sector, or a combination of some of these shapes.

  When using the sitting tool 1J, a person who sits down places the sitting tool 1J on the seating surface of the chair 156 with the back plate 152B of the support body 152 and the back plate 156B of the chair 156 facing each other. Here, the maximum distance in the front-rear direction of the sitting tool 1J between the lower cushion 153 and the end surface 221J on the first seating surface 21J side of the second seating surface 22J of the seat plate 3J is preferably 70 mm or more and 250 mm or less. . More specifically, the distance is preferably 100 mm or more and 200 mm or less, and preferably 150 mm or more and 170 mm or less, for example, in order to be able to cope with adult men and adult women having a standard body shape. More preferably, for example, 70 mm or more and 150 mm or less is preferable in order to be able to cope with a child or the like of an elementary school student or less. In addition, the distance is preferably 200 mm or more and 250 mm or less in order to make the sitting posture as good as possible even for an elderly person whose back 92 is bent convexly rearward.

  According to the tenth embodiment, in addition to the effects of the ninth embodiment, the lower cushion 153 abuts against the sacrum 912 of the person to be seated to fix the position of the sacrum 912 and the sacrum 912 is the back plate. The impact when pressed against 152B can be reduced. Further, the upper cushion 154 prompts the seated person to maintain the natural S-shaped curve of the spine 92, and also reduces the impact when the spine 92 is pressed against the back plate 152B. it can.

  In the present embodiment, only one of the lower cushion 153 and the upper cushion 154 may be provided. In addition, when only the lower cushion 153 is provided, the height of the back plate 152B of the support body 152 can be lowered accordingly, and the sitting tool 1J can be further reduced in size.

  Further, the support body 152 and the seat plate 3J may be configured as separate bodies without being fixed to each other. Accordingly, when the user is seated, the distance between the lower cushion 153 and the end surface 221J on the first seating surface 21J side of the second seating surface 22J of the seat plate 3J is determined according to the size of his / her pelvis. Can be adjusted. Accordingly, it is possible to cope with a slightly different size of the pelvis 91 depending on individual differences of seated persons. In this case, anti-slip means (not shown) may be provided on the back surface of the seat plate 3J. The anti-slip means can be realized, for example, by forming the back surface on an uneven surface or attaching an anti-slip sheet to the back surface. Alternatively, position adjusting means (not shown) for adjusting the position of the seat plate 3J in the front-rear direction with respect to the support body 152 may be provided instead of providing the anti-slip means. The position adjusting means, for example, forms a slit extending in the front-rear direction on the bottom plate 152A of the support 152 at the center in the left-right direction of the support 152, and a protrusion extending downward from the bottom surface of the seat plate 3J on the seat plate 3J. It can be realized by providing the projection so that the projection can be displaced in the front-rear direction in the slit. According to the position adjusting means, it is possible to adjust the distance between the lower cushion 153 and the end surface 221J of the seat plate 3J, while preventing the seat plate 3J from being undesirably displaced in the left-right direction with respect to the support body 152. can do.

  Further, anti-slip means (not shown) may be provided on the back surface of the bottom plate 152A of the support 152. The non-slip means is realized by, for example, forming the back surface of the bottom plate 152A with an uneven surface, attaching a non-slip sheet to the back surface of the bottom plate 152A, or applying an adhesive to the back surface of the bottom plate 152A. Can do.

  Moreover, the seat board 3 (FIGS. 1-2) which comprises the sitting tool 1 which concerns on 1st embodiment, The seat board 3B (FIG. 4) which comprises the sitting tool 1B which concerns on 3rd embodiment, and 4th embodiment. A seat plate 3C (FIG. 5) constituting the sitting tool 1C, a seat plate 3D (FIG. 6) constituting the sitting tool 1D according to the fifth embodiment, and a seat plate 3E (see FIG. 6) constituting the sitting tool 1E according to the sixth embodiment. 7) or a seat plate 3F (FIG. 8) constituting the seat tool 1F according to the seventh embodiment may be used instead of the seat plate 3J of the seat tool 1J according to this embodiment.

[Eleventh embodiment]
Next, an eleventh embodiment of the sitting tool of the present invention will be described with reference to FIGS. 12 (a) and 12 (b). Fig.12 (a) is a perspective view which shows 11th embodiment of the sitting tool of this invention. FIG.12 (b) is CC sectional drawing of the sitting tool of Fig.12 (a). In the description of the present embodiment, the description of the configuration and operation of the same parts as those of the above-described embodiments will be omitted, and the description will focus on the different parts.

  The sitting tool 1N of the present embodiment includes a seat plate 3N and a support body 158 that is installed on a horizontal surface such as a seat surface of a chair and supports the seat plate 3N.

  The seat plate 3N is different from the seat plate 3K constituting the sitting tool 1K according to the eighth embodiment shown in FIG. 9 in that the first seat surface 21N side portion is mainly formed in a wave shape. Specifically, the portion on the first seating surface 21N side of the seat plate 3N has a curved protrusion and a curved recess extending in the front-rear direction on the upper surface (first seating surface 21N) and the rear surface in the left-right direction. The wave shape is connected alternately. In the seat plate 3N, the first seat surface 21N side portion and the second seat surface 22N side portion are integrally formed.

The material of the seat plate 3N is preferably a material that is unlikely to cause dents due to the weight of the human body. As such a material, it is possible to use a high-density fabric with small shrinkage such as wood or canvas, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, or the like.
In addition, when making a material into a thermoplastic elastomer, rubber | gum, or a plastic material, it is preferable that the hardness is 5-120, and it is further more preferable that it is 40-90. The seat plate 3N is undesirably deformed by using the seat plate 3N for a long period of time while ensuring the comfort of the seated person moderately by setting the hardness within the above preferable range, in particular, the above further preferable range. Can be prevented.

  When the first seating surface 21N side portion of the seat plate 3N is formed into a wave shape and the material of the seat plate 3N is a thermoplastic elastomer, rubber, or plastic material having the above-described hardness, the user When the stool is seated, the upper ridge 140N on the first seating surface 21N side portion of the seat plate 3N can be slightly recessed depending on the weight of the user. This prevents excessive deformation in the stepped portion due to the high hardness of the seat plate 3N, and the portion of the seat plate 3N functions as a cushion when the first seating surface 21N side portion is slightly recessed. Therefore, the sitting comfort of the seated person can be improved.

Maximum length L ₁₃ in the front-rear direction in the left and right side regions 305, 305 excluding the central region 304 of the main surface 10N of the second seat surface 22N (the second seat surface 22N excluding the end surface 221N on the first seat surface 21N side), The preferred values of the maximum length L ₁₄ in the front-rear direction of the one seat surface 21N, the length W ₆ in the left-right direction of the end surface 221N of the second seat surface 22N, and the height H ₁₂ of the step formed by the end surface 221N are shown in FIG. The length L ₁₀ , the length L ₁₁ , the length W ₅ , and the height H _{11 of the} seat plate 3K shown in FIG. The height _{H 12} of the step consisting of the end surface 221N shall be construed as of the end face 221N, a height as measured from the upper end of the upper surface of the projecting portion 140N of the monodentate surface 21N.

  In addition, the first seating surface 21N of the seating plate 3N extends over the entire length of the seating plate 3N in the left-right direction of the sitting tool 1N without being obstructed by the step due to the end surface 221N, and the end surface 221N is a flat surface. Since it is the same as the seat plate 3K shown in FIG. 9 in that it is curved or bent so as to protrude forward when viewed, the description thereof is omitted.

  The support body 158 placed on the horizontal plane has a bottom plate 158A on which the seat plate 3N is placed, a first back plate portion 158C, and a second back plate portion 158B. The first back plate portion 158C is formed integrally with the bottom plate 158A and extends upward from the rear end portion of the bottom plate 158A. The second back plate portion 158B is configured separately from the bottom plate 158A and the first back plate portion 158C, and is fixed to the front surface of the first back plate portion 158C by an arbitrary fixing means. Accordingly, the first back plate portion 158C and the second back plate portion 158B substantially constitute the back plate of the support body 158 of the sitting tool 1N. The back plate of the seating tool 1N extends from the end of the bottom plate 158A on the first seating surface 21N side of the seat plate 3N, and is substantially perpendicular to the bottom plate 158A at the second back plate portion 158B. It extends. However, the bottom plate 158A, the first back plate portion 158C, and the second back plate portion 158B may be integrally formed.

  The support body 158 differs from the support body 157 shown in FIG. 10 mainly in that a plurality of grooves 159 extending in the front-rear direction are formed on the upper surface of the bottom plate 158A. As is apparent from FIG. 12B, the groove 159 is fitted with the protrusion 141N on the back surface side of the seat plate 3N, and the seat plate 3N slides on the bottom plate 157A of the support body 157 in the front-rear direction. Dimensioned to get. As a result, the user can adjust the position of the seat plate 3N in the front-rear direction with respect to the second back plate portion 158B of the support body 158 when seated, and the seat plate 3N is not supported with respect to the support body 158. It is possible to suppress displacement in the left-right direction as desired.

  As shown in FIG. 12, when the length in the front-rear direction of the groove 159 of the support 158 is formed longer than the length in the front-rear direction of the seat plate 3N, the protrusion 141N on the back surface side of the seat plate 3N When sliding in the groove 159, the groove 159 guides it more stably.

A preferred value of the angle formed between the bottom plate 158A of the support 158 and the second back plate portion 158B, that is, the angle θ ₈ formed between the upper surface of the substantially horizontal extending portion of the bottom plate 158A and the front surface of the second back plate portion 158B, This is the same as the angle θ ₇ formed in FIG.

  According to the eleventh embodiment, in addition to the effects of the ninth embodiment, the seat plate 3N can slide on the support body 158 in the front-rear direction while fitting with the support body 158. However, when sitting, the position of the seat plate 3N in the front-rear direction with respect to the second back plate portion 158B of the support 158 can be adjusted, and the seat plate 3N is undesirably left and right with respect to the support 158. Displacement can be suppressed.

  Note that anti-slip means (not shown) may be provided on the back surface of the bottom plate 158A of the support 158. The anti-slip means is realized by, for example, forming the back surface of the bottom plate 158A as an uneven surface, attaching a non-slip sheet to the back surface of the bottom plate 158A, or applying an adhesive to the back surface of the bottom plate 158A. Can do.

  In the present embodiment, the seating tool 1N is configured by combining the seating board 3N and the support body 158. However, the seating tool may be configured only by the seating board 3N without using the support body 158.

  In addition, all the sitting tools according to the first to eleventh embodiments described above may include a cover (not shown) that covers the entire sitting tool. Such a cover can be composed of, for example, a sheet made of stretchable cloth or the like.

<Chair>
Hereinafter, 1st-3rd embodiment of the chair of this invention and the other chair of this invention is described, referring FIGS. 13-16. The embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment.

  The chair of the present invention and the other chair of the present invention basically have a seating surface similar to the seating surface of the above-described seating tool of the present invention. Therefore, the seat surface of the sitting tool according to each embodiment described above can be applied to the chair of the present invention and the other chair of the present invention.

[First embodiment]
A first embodiment of the chair of the present invention and another chair of the present invention will be described with reference to FIGS. FIG. 13: is a perspective view which shows 1st embodiment of the chair of this invention and the other chair of this invention. 14 is a cross-sectional view taken along line B-B in FIG. 13, showing a human body seated on the chair in FIG. 13. The chair 101 of this embodiment includes a first seat plate 108 that forms a first seat surface 21G, a second seat plate 109 that forms a second seat surface 22G, a back plate 103, legs 104, and a coupling plate 105. . The first seat plate 108 and the second seat plate 109 form one seat plate 110. The coupling plate 105 couples the first seat plate 108, the second seat plate 109, and the legs 104 to each other. A pair of legs 104 and coupling plates 105 are provided on the left and right sides of the chair 101, respectively, and each leg 104 branches to the front and rear of the chair 101. Thereby, the chair 101 is supported by four legs and becomes independent.

  In the longitudinal cross section in the front-rear direction, the back plate 103 and the seat plate 110 are such that the front surface of the back plate 103 located on the side of the seat plate 110 (the surface facing the human body) is substantially upward above the first seat surface 21G. They are combined so as to extend at right angles, and are connected by being sandwiched between coupling plates 105 and 105 from both the left and right sides. The back plate 103, the first seat plate 108, the second seat plate 109, and the coupling plate 105 coupled to each other are coupled to the leg portion 104 by fastening the coupling plate 105 and the leg portion 104 with, for example, a bolt 106. Is done. Note that the front surface of the back plate 103 may extend only substantially at a right angle upward with respect to the first seat surface 21G.

  The second seating surface 22G extends from the first seating surface 21G in the forward direction of the chair 101. The second seating surface 22G forms a step at a position higher than the first seating surface 21G by the end surface 221G on the first seating surface 21G side. The seating surface 2G includes a first seating surface 21G that is convex in an arc shape in the direction of the second seating surface 22G, similarly to the seating surface 2D of the sitting tool 1D according to the fifth embodiment shown in FIG. Accordingly, the end surface 221G on the first seating surface 21G side of the second seating surface 22G is formed to be curved or bent so as to be convex in the front direction of the chair 101 when viewed in plan. Further, the seat surface 2G is different from the seat surface 2D in that the length of the second seat surface 22G in the front-rear direction is the longest in the vicinity of the center line in the left-right direction (the chain line in FIG. 13). Yes. The first seat plate 108 and the second seat plate 109 are connected to each other in a state where the second seat plate 109 overlaps the front portion of the surface of the first seat plate 108 by a pair of fasteners 107 such as left and right bolts. It is concluded.

  The first seat surface 21 </ b> G is formed by a portion of the surface of the first seat plate 108 that does not overlap the second seat plate 109. The second seating surface 22G is the upper surface of the second seating plate 109. The second seating surface 22G has a rear end surface, that is, an end surface 221G on the first seating surface 21G side as an inclined surface, and is adjacent to the first seating surface 21G at the end surface 221G.

  When a human body is seated on the chair 101, the seated person places his buttocks on the first seating surface 21G and places the upper thigh on the second seating surface 22G. The seated person's buttocks are supported and the second seating surface 22G supports the seated person's upper thigh. At this time, the pair of sciatic bones 911 and 911 of the seated person are in contact with the end surface 221G, and the forward movement is restricted by the step by the end surface 221G, and the seated person's sacrum 912 is brought into contact with the front surface of the back plate 103. In contact therewith, the movement of the back is restricted by the front surface of the back plate 103, and a three-point fixed state is achieved.

  The first seat surface 21G extends over the entire length of the seat plate 110 in the left-right direction of the chair 101 without being interrupted by a step. For this reason, the step does not press the left and right sides of the seated person's buttocks, and the first seating surface 21G supports the seated person's buttocks, so that the seated person can sit comfortably without feeling a sense of pressure on the buttocks. Can do.

  The end surface 221G on the first seating surface 21G side of the second seating surface 22G is formed to be curved so as to protrude forward when viewed in plan. The chair 101 according to the present embodiment is provided with such a step due to the end surface 221G, so that the pair of sciatic bones 911 and 911 can be fixed so as to wrap around the step 221G. Absorbing the difference, the seating position of the seated person can be improved more effectively, and the level difference along the contour of the sciatic bone is seen in plan view, so that the seated person sits more comfortably. be able to. At this time, a suitable value of the radius of curvature of the edge on the front side of the end surface 221G when viewed in plan is, for example, 290 to 330 mm.

The main surface 10G of the second seating surface 22G (the second seating surface 22G excluding the end surface 221G on the first seating surface 21G side) is formed by a pair of left and right regions 303, 303 excluding the center region 302 in the left-right direction. Support the upper thigh. If the length in the front-rear direction in the left and right side regions 303, 303 of the main surface 10G is long, the upper part of the thigh of the seat occupant is widely pressed against the main surface 10G, and the comfort of the seat occupant is reduced. Therefore, it is preferable that the length in the front-rear direction in the left and right side regions 303, 303 of the main surface 10G is shorter. From this point of view, the main surface 10G of the second seat surface 22G, the left and right sides of the region 303 and 303, the front-rear direction of the maximum length _{L 7} is, of the monodentate surface 21G, the maximum length _{L 6} of the front-rear direction It is short. According to this configuration, the upper thigh of the seated person can be prevented from being widely pressed against the second seating surface 22G, and the seated person can sit comfortably for a long time, and the chair 101 can be configured to be extremely compact. Can do.

  Here, the central region 302 in the left-right direction on the main surface 10G of the second seating surface 22G is located between the pair of upper thighs of the seated person and sandwiches the center line in the left-right direction of the main surface 10G. An area having a quarter width with respect to the length of the main surface 10G in the left-right direction is referred to.

Here, it is necessary to accommodate the seated person's entire buttocks between the end surface 221G and the front surface of the back plate 103 so that the three-point fixed state can be achieved. In this respect, the maximum length _{L 6} longitudinal direction of the chair 101 of the monodentate surface 21G is set to be 70mm or 250mm or less. Note that, specifically, the maximum length _{L 6,} for example, in order to enable corresponding adult male and adult female with standard type is preferably 100mm or more 200mm or less, 150 mm or more 170mm More preferably, it is preferably 70 mm or more and 150 mm or less in order to be able to cope with a child or the like of elementary school students or less. Further, the maximum length L _6, for example, because the spine 92 is that as much as possible even sitting position a elderly like bent convexly backward good, it is 250mm or less than 200mm preferable.

The second seating surface 22G supports the upper part of the thigh of the seated person by the regions 303 and 303 on both the left and right sides of the main surface 10G, and forms a step composed of the end surface 221G on the first seating surface 21G side. 911, 911 has a function of restricting movement forward. Here, the maximum length L ₇ in the front-rear direction of the chair 101 in the left and right regions 303 of the main surface 10G of the second seating surface 22G is not involved in achieving the three-point fixed state, When the maximum length L ₇ is long, correspondingly, and thus reducing the comfort of the seated person thigh upper it is pressed wide seated person to a second seat surface 22G. Therefore, the maximum length L ₇ are shorter are preferred, in the present embodiment is specifically being a 150mm or less. Note that the maximum length _{L 7} is more preferably 90mm or less, and more preferably 40mm or less. On the other hand, if the maximum length L ₇ is too short, if hardness is used relatively low material, the second seat surface 22G by weight applied from the seat occupant is likely to deform, using a relatively high material hardness conversely In this case, the comfort of the seated person is reduced because the portion of the second seating surface 22G bites into the upper part of the thigh of the seated person. From this point of view, the length _{L 7} is preferably 3mm or more.

The height _{H 6} of the back plate 103 with respect to the monodentate surface 21G is preferably at least 50mm 350mm or less, still more preferably 100mm or more 210mm or less. In addition, the angle θ ₇ formed by the front surface of the back plate 103 and the first seating surface 21G is preferably substantially a right angle so that a three-point fixed state can be achieved, specifically 90 ° to 120 °. It is preferable that it is 90 ° or more and 95 ° or less.

  According to the chair 101 according to the first embodiment, the maximum length in the front-rear direction of the seating surface 2G is, for example, 150 mm or more and 170 mm or less, and substantially the same as the length from the sacrum 912 to the upper thigh when the human body is seated. be able to. Thus, the chair 101 according to this embodiment has a length in the front-rear direction of the seating surface that is substantially the same as the length from the sacrum to the lower thigh when the human body is seated. It becomes compact and can be stored more easily.

  In the chair according to the present embodiment, the first seat plate 108 and the second seat plate 109 may be integrally formed.

  Further, the fastener 107 may be provided with an adjustment mechanism (not shown) for adjusting the separation width between the back plate 103 and the second seat surface 22G. In this case, the first seat plate 108 and / or the second seat plate 109 are provided with slits (through holes) corresponding to the size of the separation width to be adjustable so that the fastener 107 can move in the front-rear direction. Is exemplified.

  A tilt mechanism that tilts the back plate 103, the seat plate 110, and the coupling plate 105 integrally with respect to the leg 104 may be provided using the bolt 106 as a rotation axis. By providing such a tilting mechanism, when the user of the chair 101 feels pressure on the buttocks associated with maintaining the same posture for a long time, the back plate 103, the seat plate 110, and the coupling are temporarily provided. The plate 105 can be inclined rearward to reduce the pressure applied to the buttocks.

  In the above embodiment, the leg portions 104 are provided on both sides of the chair 101. However, the leg portions may be provided near the center (center of gravity) on the back side of the seating surface. In this case, a known lifting means such as a gas cylinder may be provided on the leg.

  The storability may be further improved by configuring the chair 101 in a foldable manner.

Since the central region 302 of the main surface 10G does not take much weight from the upper part of the thigh of the seated person, the length in the front-rear direction is as shown in FIG. It may be longer than 303. However, from the viewpoint of compactness, the longitudinal length of the main surface 10G, over the entire right and left direction, it is preferably formed shorter than the maximum length L ₇ of the longitudinal direction of the monodentate surface 21G.

  Also, a sitting tool 1 according to the first embodiment (FIGS. 1 and 2), a sitting tool 1B according to the third embodiment (FIG. 4), a sitting tool 1C according to the fourth embodiment (FIG. 5), and a sixth embodiment. Sitting tool 1E (FIG. 7) according to the seventh embodiment, sitting tool 1F according to the seventh embodiment (FIG. 8), sitting tool 1K according to the eighth embodiment (FIG. 9), sitting tool 1N according to the eleventh embodiment (FIG. 12) can be used instead of the seat 2G of the chair 101 according to the present embodiment.

[Second Embodiment]
Next, a second embodiment of the chair of the present invention and another chair of the present invention will be described with reference to FIG. FIG. 15 is a perspective view showing a second embodiment of the chair of the present invention and another chair of the present invention. The chair 131 according to this embodiment includes a seat plate 135 having a seat surface 2H, a back plate 133, legs 134, and a fixture 138 for fixing the back plate 133 to the seat plate 135.

  The seat surface 2H has the same structure as the seat surface of the sitting tool 1D according to the fifth embodiment shown in FIG. Specifically, the seat surface 2H includes a first seat surface 21H and a second seat surface 22H. The end surface 221H on the first seating surface 21H side of the second seating surface 22H is formed to be curved so as to protrude forward when viewed in plan. The second seat surface 22H forms a step by the end surface 221H on the first seat surface 21H side.

The fixture 138 has a pair of poles extending in the vertical direction and spaced apart from each other in the horizontal direction, and is attached to the rear end surface of the seat plate 135. The front surface of the back plate 133 located on the seat plate 135 side extends upward at a substantially right angle with respect to the first seat surface 21H. That is, the angle θ ₄ formed by the front surface of the back plate 133 and the first seat surface 21H in the longitudinal cross section in the front-rear direction is substantially perpendicular so as to achieve a three-point fixed state, specifically 90 °. The angle is preferably 120 ° or less and more preferably 90 ° or more and 95 ° or less.

As illustrated, the back plate 133 is spaced apart from the seat plate 135 in the vertical direction, but has the same function as the back plate 103 in the chair 101 according to the first embodiment. That is, the position of the back plate 133 in the vertical direction with respect to the first seat surface 21H is set so as to be able to contact the sacrum 912 of the seated person. In this respect, vertical distance _{H 7} between the lower edge and the monodentate surface 21H of the back plate 133 is preferably 10mm or more 250mm or less, and more preferably 30mm or more 70mm or less.

  The length in the front-rear direction of the main surface 10H of the second seat surface 22H is shorter than the maximum length in the front-rear direction of the first seat surface 21H over the entire region in the left-right direction. According to this configuration, the upper thigh of the seated person can be prevented from being widely pressed against the second seating surface 22H, the seated person can be comfortably seated for a long time, and the chair 131 can be configured to be extremely compact. Can do.

  The first seat surface 21H extends over the entire length of the seat plate 135 in the left-right direction of the chair 131 without being obstructed by the step. In other words, the right and left sides of the first seat surface 21H are not provided with anything that restricts the pelvis 91 of the seated person. For this reason, the step does not press the left and right sides of the seated person's buttocks, and the first seating surface 21H supports the seated person's buttocks. As a result, the seated person can sit comfortably without feeling a sense of pressure on the buttocks. Can do. Furthermore, even if the seated person's buttocks protrudes from the left and right sides of the first seating surface 21H, as long as the length of the step in the left-right direction is equal to or greater than the distance between the pair of ischials, the three-point fixed state is satisfactory. Can be achieved. Therefore, for example, the length of the step in the left-right direction can be shortened to be equal to the distance between the pair of ischials, and the chair 131 can be configured compactly.

  When a human body is seated on the chair 131, a pair of sciatic bones 911 and 911 positioned below the pelvis 91 are caught by the step formed by the end surface 221H, and the sacrum 912 of the human body abuts against the back plate 133, so It becomes a fixed state. Therefore, the same effect as the first embodiment can be obtained.

  The center of the first seat surface 21H in the left-right direction of the chair 131 of the maximum length in the front-rear direction of the chair 131 and the second seat surface 22H (that is, the main surface 10H) excluding the end surface 221H on the first seat surface 21H side. Various dimensions such as the maximum length in the front-rear direction of the chair 131 in the area excluding the area are the same as those described in the first embodiment (FIG. 13).

[Third embodiment]
Next, a third embodiment of the chair of the present invention and another chair of the present invention will be described with reference to FIG. FIG. 16 is a perspective view showing a third embodiment of the chair of the present invention and another chair of the present invention. The chair 165 according to the present embodiment includes a seat plate 156A, a back plate 156B, a step forming member 161 fixed on the seat surface, and a wall surface forming member 163 fixed to the front surface of the back plate 156B. This chair 165 can be made by attaching a step forming member 161 and a wall surface forming member 163 to a known chair 156 whose back plate 156B is greatly inclined rearward. Then, the step forming member 161 and the portion of the seat plate 156A on the rear side of the step forming member 161 (the portion between the step forming member 161 and the back plate 156B) are combined to form one seat plate.

  The upper surface 170 and the rear end surface 171 of the step forming member 161 constitute the main surface of the second seat surface and the end surface on the first seat surface side similar to those in the sitting tool and chair according to each of the embodiments described above. . Further, the upper surface of the portion of the seat plate 156A on the rear side of the step forming member 161 and on the front side of the wall surface forming member 163 constitutes the first seat surface similar to that in the sitting tool or chair according to the above-described embodiments. . The step forming member 161 forms a step with respect to the upper surface of the seat plate 156A. When the human body sits on the chair 165, the seat 156A constituting the first seating surface supports the seated person's buttocks on the upper surface of the portion on the rear side of the step forming member 161 and on the front side of the wall surface forming member 163, and the second seat The upper surface 170 of the step forming member 161 constituting the surface supports the thigh of the seated person. Then, the forward movement of the pair of sciatica 911 and 911 is restricted by the end surface 171 on the rear side of the step forming member 161 that forms a step. About the shape and dimension of the upper surface 170 of the level | step difference formation member 161, since it is the same as that of the main surface 10K of the 2nd seat surface 22K of the sitting tool 1K which concerns on 8th embodiment shown in FIG. 9, the detailed description is abbreviate | omitted. .

  The step forming member 161 is attached to the upper surface of the seat plate 156A by a fixing means 162 such as an adhesive or a hook-and-loop fastener.

The wall surface forming member 163 is attached to the front surface of the back plate 156B of the chair 156 by fixing means 164 such as an adhesive or a hook-and-loop fastener. The wall surface forming member 163 and the back plate 156B substantially constitute the back plate of the chair 165. A front surface of the back plate of the chair 165 located on the seat plate side is a front surface portion of the wall surface forming member 163 and extends upward at a substantially right angle with respect to the first seat surface. The movement of the person sitting on the chair 156 to the rear of the sacrum 912 is restricted by the front surface of the wall surface forming member 163. From this viewpoint, the wall surface forming member 163 is preferably disposed within a height range of 50 mm or more and 350 mm or less from the upper surface of the bottom plate 156A so that it can come into contact with the sacrum 912 of the person sitting on the chair 156. More preferably, it is arranged within the following height range. In addition, an angle θ ₆ formed by the front surface of the wall surface forming member 163 and the seat surface of the chair 156 in the longitudinal cross section in the front-rear direction is substantially a right angle, and specifically, 90 ° or more and 120 ° or less. Preferably, it is 90 degrees or more and 95 degrees or less.

The step forming member 161 and the wall surface forming member 163 are preferably made of a material that does not easily cause dents due to the weight of the user. As such a material, it is possible to use a high-density fabric with small shrinkage such as wood or canvas, a plastic material such as thermoplastic elastomer (TPE), rubber, EVA resin, or the like.
In addition, when making a material into a thermoplastic elastomer, rubber | gum, or a plastic material, it is preferable that the hardness is 5-120, and it is further more preferable that it is 40-90. By setting the hardness within the above preferable range, particularly the above further preferable range, the step forming member 161 and the wall surface forming member 163 are used over a long period of time while appropriately ensuring the comfort of the seated person. It is possible to prevent the member 161 and the wall surface forming member 163 from being undesirably deformed.

  The maximum length of the first seat surface in the front-rear direction of the chair 165, that is, the maximum distance in the front-rear direction of the chair 165 between the front surface of the wall surface forming member 163 and the lower end of the end surface 171 on the rear side of the step forming member 161 is 70 mm or more and 250 mm or less. The distance is preferably 100 mm or more and 200 mm or less, more preferably 150 mm or more and 170 mm or less, for example, in order to be able to cope with adult men and adult women having a standard body shape. For example, in order to be able to cope with a child or the like of an elementary school student or less, it is preferably 70 mm or more and 150 mm or less. In addition, the distance is preferably 200 mm or more and 250 mm or less in order to make the sitting posture as good as possible even for an elderly person whose back 92 is bent convexly rearward.

  According to the third embodiment, the user can maintain the three-point fixed state only by attaching the step forming member 161 and the wall surface forming member 163 to the chair 156 that cannot maintain the three-point fixed state. 165 can be obtained. Therefore, when attaching the step forming member 161 and the wall surface forming member 163, the user sets the maximum distance in the front-rear direction between the wall surface forming member 163 and the step forming member 161 according to the size of the pelvis 91. In the range of the above-mentioned value, it can adjust suitably.

  When the back plate 156B of the chair 165 is substantially perpendicular to the seat plate 156A, the wall surface forming member 163 may not be used.

  Further, various dimensions such as the maximum length in the front-rear direction of the chair 165 in the second seat surface excluding the end surface on the first seat surface side, that is, the region excluding the central region in the left-right direction of the chair 165 of the main surface 170. Is the same as that described in the first embodiment (FIG. 13).

  As mentioned above, although the embodiment of the sitting tool and chair of this invention was demonstrated, this invention is not restricted to the said embodiment, Various modifications and modifications are also included. For example, the technical elements described in one embodiment can be applied to the other embodiment.

  The sitting tool and chair of the present invention are particularly suitable for application as a sitting tool and chair used for long-time work, driving, studying, theater play, sports watching, etc. Buildings, especially chairs built on large buildings such as auditoriums and stadiums, office chairs, nursing chairs, nursing beds, table chairs, public benches, car seats, aircraft seats, ski resorts It can be suitably used as a lift chair, a wheelchair or the like, or placed on them.

1, 1A, 1B, 1C, 1D, 1E, 1F, 1J, 1K, 1M, 1N seating fixture 2, 2B, 2C, 2D, 2E, 2F, 2G, 2H, 2J, 2K, 2M, 2N seating surface 3, 3A, 3B, 3C, 3D, 3E, 3F, 3J, 3K, 3M, 3N Seat plate 4 Surface member 5 Fabric 7, 101, 131, 156, 165 Chair 8 Wall 9 Horizontal surface 10, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10J, 10K, 10M, 10N Main surface 11, 11F, 11J Back surface 12 Rear seat plate 13 Concavity and convexity sheet 21, 21B, 21C, 21D, 21E, 21F, 21G, 21H, 21J, 21K, 21M , 21N First seat surface 22, 22B, 22C, 22D, 22E, 22F, 22G, 22H, 22J, 22K, 22M, 22M Second seat surface 31 Back plate 71, 110 of the sitting tool 35, 156A Chair seat plate 72 Chair seat surface 73, 103, 133, 156B Chair back plate 91 Pelvis 92 Spine 104, 134 Leg 105 Binding plate 106 Bolt 107 Fastener 108 First seat plate 109 Second seat plate 138 Fixing tool 140N Upper surface side ridge portion 141N Back surface side ridge portion 152, 157, 158 Support body 152A, 157A, 158A Support body bottom plate 152B, 157B Support body back plate 153 Lower cushion 154 Upper cushion 155, 162, 164 fixing means 158B second back plate portion of support 158C first back plate portion of support 159 groove 161 step forming member 163 wall surface forming member 170 upper surface of step forming member 171 rear end surface 211 of step forming member, 211B, 211C, 211D, 211E, 211F, 211G, 211 , 211J, 211K, 211M, 211N Rear edges 221, 221B, 221C, 221D, 221E, 221F, 221G, 221J, 221K, 221M, 221N End surfaces 222, 222B of the second seating surface on the first seating surface side 222C, 222D, 222E, 222F, 222G, 222H, 222J, 222K, 222M, 222N Front edge 223 Cylinder 224 Cylinder filler 225 Core material 230F Hard material seat plate 232F Soft material seat plate 300, 302, 304 Central region 301 , 303, 305 Left and right side areas (excluding the center area)
911 Sciatica 912 Sacrum

Claims (3)

In a sitting tool comprising a seat plate and configured to be used in a state of being mounted on the chair without being fixed to the chair ,
The seat plate is a deformable plate,
The seat plate includes a first seat surface, and a second seat surface extending continuously from the first seat surface in the front direction of the sitting tool,
The second seating surface forms a step at a position higher than the first seating surface by the end surface on the first seating surface side, and thereby, of the second seating surface, on the first seating surface side. The main surface , which is a portion extending continuously from the end surface to the front of the sitting tool, is at a position higher than the first seat surface,
The seat plate supports the buttocks of the seat occupant by the first seat surface, and the seat bone of the seat occupant moves to the front of the seat by the end surface on the first seat surface side of the second seat surface. It is configured to regulate and support the upper thigh of the seated person by the main surface,
When the end surface of the second seat surface on the first seat surface side is viewed in plan, the front edge of the seat plate excluding the front edge and the rear edge of the seat plate at both the left and right edges of the seat plate and It extends between the parts located between the rear edges by bending or bending so as to be convex in the front direction of the sitting tool,
The maximum length of the first seat surface in the front-rear direction of the sitting tool is 100 mm or more and 200 mm or less,
Of the main surface of the front Stories second seat surface, the region excluding the central region in the lateral direction of the seat member state, and are the 3mm or 40mm or less longitudinal direction of maximum length of the seat member,
The length of the second seating surface on the first seating surface side in the left-right direction of the sitting tool is 250 mm or more and 300 mm or less,
The first seat surface side portion of the seat plate has a substantially uniform plate thickness, and the upper surface and the rear surface of the seat plate are provided with a curved ridge portion and a curved groove portion extending in the front-rear direction of the seat device, respectively. It characterized that you have been formed in the wave shape alternately connected to the lateral direction, the seat member. A back plate configured integrally with the seat plate or fixed to the seat plate, extending from an end of the seat plate on the first seat surface side, and extending at least partially at a right angle to the seat plate. The sitting tool according to claim 1, further comprising: Configured on the seat plate and another member, which is configured to support the seat plate, further comprising a support,
The support body extends from a bottom plate on which the seat plate is mounted without being fixed, and an end portion of the bottom plate on the first seat surface side, and is at least partially perpendicular to the bottom plate. possess a back plate which extends to,
The sitting tool according to claim 1, wherein the back plate is configured integrally with the bottom plate or is fixed to the bottom plate .

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