JP2007151582A - Body supporting plate and chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backrest which is softly applied to the body of a person and is excellent in fitness and a cushioning property. <P>SOLUTION: Many vertically long projected lines 49 are formed at least on the front surface of a backrest plate 16, and both left and right end parts of a lower back abutting part 16a are attached to a back frame 18 in the state of being supported at both ends. The backrest plate 16 is composed of a resin material having a rubber property and has such elasticity (flexibility) that it can be easily pushed and bent by a person with a hand in the state of not being attached to the back frame. By providing the rubber property, since the property of deformation following the body of a person is high, a comfortable leaning feeling is given to a user. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a body support plate such as a backrest plate or a seat plate of a chair, and a chair. Examples of the body support plate include, for example, a bed mat and a stretcher support plate in addition to a chair backrest plate and a seat plate. The chair includes various types such as a sofa and a vehicle seat.

  A number of improvements have been proposed to improve the comfort and comfort of a seated person in a chair with a backrest. As an example, Patent Document 1 discloses that a chair having a backrest plate and a seat plate made of a thin flexible material can be fitted to a human body by forming a large number of longitudinal slit groups on the back plate and the seat plate. An improved chair is disclosed.

On the other hand, the back of an office chair has a structure in which a resin inner shell is attached to a resin outer shell and a cushion material is stretched on the front surface of the inner shoulder. In Document 2, by forming a horizontal group of slits on the left and right side portions of the inner shell (inner plate), it is possible to allow the left and right side portions of the inner shell to be greatly bent and deformed backward, and the inner shell A chair has been disclosed in which the upper and lower parts of the board are attached to the back frame and the left and right sides are in a free end state, thereby greatly improving the ease of deformation.
Japanese Patent No. 2969290 Japanese Patent Application Laid-Open No. 2005-152087

  By the way, the conventional inner shell (inner plate) of the backrest is designed so that the front surface thereof is a smooth surface without unevenness. This is due to the fact that the inner shell is made of a resin that feels soft to the touch even though it is bent (bent), such as polypropylene, and avoids the user from feeling pushed up and uncomfortable. Therefore, it can be said that the front surface of the inner shell is smooth.

  On the other hand, the distribution of nerves on the surface of the human body is not uniform, and there are sensitive and insensitive parts. In addition, the smoothness of the front surface of the inner shell of the backrest does not necessarily improve the fit, and the inner shell may partially hit the person's back and feel uncomfortable. In addition, the backrest fit and cushioning are greatly influenced by the material that hits the person's back.

  The backrest disclosed in Patent Document 2 is based on a flat inner shell and devised the mounting structure and the shape of the slit group, and can provide much higher fit and cushioning than conventional products. did it. The main object of the present invention is to provide a support plate that is soft against the human body from a viewpoint different from Patent Document 2.

  For example, in the case of an inner shell (back plate) of a chair, the form and material are major factors as factors that provide a comfortable seating comfort for the seated person. Conventionally, the surface of the inner shell is smoothed to ensure softness to the human body, and the inner shell is made of a material having relatively high rigidity such as polypropylene from the viewpoint of form retention. It can be said that resin was used. The inventor of the present application has completed the present invention by studying both the form and the material of the body support plate such as the inner shell for the backrest from the viewpoint different from the prior art.

  The present invention includes the invention described in each claim. Of these, the invention of claim 1 is a resin support plate that supports a human body directly or via a cushioning material such as a cushioning material, and has flexibility to bend and deform against elasticity. In addition, at least the surface is formed with a large number of elongated protrusions or grooves, and is attached to the frames in a state that allows bending and deformation due to human body pressure at a plurality of peripheral portions. A mounting part is provided. In this case, the frames refer to members that are supported in a state in which the deformation of the support plate is allowed, and the specific form is not limited.

  The invention of claim 2 is a preferred example of claim 1, and in this invention, the ridge group or groove group is formed so as to extend substantially in parallel. It extends long in the same direction as the height direction.

  The invention of claim 3 is a resin support plate that supports a human body directly or via a cushioning material such as a cushion material, as in claim 1 or 2, and this support plate is a rubber-like support plate. It is made of a material that has properties and elastically deforms due to human body pressure, and is provided with attachment portions that are attached to the frames in a state of being supported at both ends at a plurality of locations.

  In this claim 3, “having rubber-like properties” means that, for example, when used for an inner shell of a backrest, the general adult has elasticity that can be easily bent and deformed by holding both ends by hand. In many cases, it has an appearance like a synthetic rubber (for example, urethane comb) (as a mechanical property, unlike a resin such as polypropylene, it has a large elastic modulus against compression). Structurally, it is understood that molecules are often linked by a crosslinked structure. In addition, although the aspect in which the surface and the back surface are smooth is also included in claim 3, as in claims 1 and 2, forming a ridge group or groove group on at least the front surface, It is also possible to form groove groups.

  The invention of claim 4 is a chair in which at least the backrest plate of the backrest plate and the seat plate is composed of the body support plate according to claim 1 or 2, and a back frame is disposed on the back side of the backrest plate. The front surface of the backrest plate is formed in an uneven shape in a flat cross section by forming a number of vertically extending and protruding ridges or grooves on the front surface, and the lower end of the backrest plate is more than the waist of the seated person The upper part of the backrest plate is attached to the back frame, and the portion of the backrest plate against the waist of the seated person is in a state of being supported at both ends by attaching the left and right ends to the back frame.

  As described above, the inner shell of the backrest in the conventional chair has a smooth surface, but when the present inventor applied to the inner shell of the backrest, the support plate as in claim 1 of the present invention. Even if a ridge group or a groove group is formed on the surface of the film, no particular sense of incongruity is felt, but rather it can be expected that the contact with the body can be suppressed. And when the slit group is formed as in Patent Document 1, since the slits are open on both the front and back sides of the support plate, it tends to widen the interval between the adjacent slits due to human body pressure and deforms excessively. However, if the ridge group or groove group is formed as in claim 1 of the present application, the support plate suppresses excessive expansion while allowing bending deformation, thereby supporting stability to the human body. Can be secured.

  In the case of claim 1, the direction of the ridge or groove is not limited, but as in claim 2, the ridge or groove extends in the height direction of the person (that is, the direction extending from the head toward the foot). In particular, when the back was supported, there was no sense of incongruity and it was suitable.

  The invention of claim 3 is a feature of the present invention viewed from the viewpoint of the material, and when a material having rubber-like properties is used as the material of the support plate as in claim 3, the contact with the human body is only soft. In addition, the fit and cushioning of the human body can be significantly improved. By combining the structure of this claim with claims 1, 2, and 4, it is possible to obtain a support plate that is particularly excellent in softness against the body.

  When applied to the backrest plate of the chair as in the invention of claim 4, it is possible to ensure softness to hit the body in a leaned state, and to fit so as to be deformed so as to adapt to the body regardless of the physique. It is possible to provide a chair that is excellent and has an unprecedented excellent leaning comfort. In particular, if the material of the back plate is made of the rubber-like material of claim 3, while improving the softness and fit to the human body, the back plate can be stretched and deformed to improve the cushioning property, Particularly preferred.

  In addition, when applied to the back plate of a chair whose backrest tilts backward and forms the ridge group or groove group extending vertically as in claim 1, the person does not feel any sense of incongruity at the back, For example, when a person's body is directly received by a backrest board, the vertical sliding of the body is extremely good, and there is an advantage that so-called shirt sag can be prevented.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1-8 has shown 1st Embodiment applied to the backrest board of a chair (office revolving chair).

(1). Outline of Chair FIG. 1 is a schematic perspective view of a chair, FIG. 2 (A) is a schematic right side view of the chair, (B) is a sectional view taken along line BB of (A), and FIG. FIG. First, an outline of the chair will be described based on these drawings.

  The chair includes a leg 1, a seat 2, and a backrest 3. The leg 1 includes a group of branch legs 4 extending horizontally and a leg column (gas cylinder) 5, and a base 6 having an upward opening is attached to the upper end of the leg column 5. The seat 2 includes a seat receiving frame 7 and a seat plate (not clearly shown) attached to the upper surface thereof, and a cushion is stretched on the seat plate.

  On both the left and right sides of the base 6, there are disposed swing frames 8 whose rear portions are back struts 8a. The swing frame 8 has a left and right longitudinal direction on the base 6 so as to tilt backward with its front end as the center. The first support shaft 9 is attached. The front portion of the seat receiving frame 7 and the base 6 are connected by two left and right front support links 10, and the rear portion of the seat receiving frame 7 and the left and right swing frames 8 are connected by two rear support links 11. It is connected. As shown in FIG. 3, the left and right back struts 8a are connected to each other by a reinforcing member 8c at the upper part thereof.

  The front support link 10 is connected to the base 6 by a left and right longitudinal second support shaft 10 ', and is rotatably connected to the seat receiving frame 7 by a third support shaft 12, and the rear support link. 11 is rotatably connected to the swing frame 8 by a fourth support shaft 13, and is rotatably connected to the seat receiving frame 7 by a fifth support shaft 14. The front and rear support links 10 and 11 are tilted rearward in a state where no person is seated. For this reason, when a person is seated, the front and rear support links 10 and 11 tilt backward. A hole formed in the base 6 so that the second support shaft 10 ′ is fitted is a long hole extending substantially front and rear in a side view.

  As simply shown in FIG. 2A, a compression coil spring 15 that elastically supports the backward movement of the second support shaft 15 is disposed inside the base 6. The compression coil spring 15 is an example of a spring means that elastically supports the rearward tilting of the backrest 3, so that the compression coil spring 15 is not contracted or deformed at all when the person is seated, and is contracted and deformed when the person leans against the backrest 3. Strength is set. As can be easily understood from FIG. 2, in the chair of the present embodiment, the second support shaft 10 ′ slides along the long hole so that the seat 2 moves backward and backward in conjunction with the back tilt of the backrest 3. Needless to say, it may be a type that only the backrest 3 tilts backward.

  The backrest 3 is mainly composed of a backrest plate 16 to which the present invention is applied. In the drawing, the back plate 16 is exposed in front of it, but a cushioning material such as a cushioning material or a skin material can also be disposed. The backrest plate 16 inclines backward as a whole in a state in which no person is leaning on, and is curved in a concave shape as a whole in plan view. Further, the lower portion of the lower portion is curved in a forwardly convex shape as viewed from the side with the portion corresponding to the waist of the person seated as a center (this portion is referred to as a waist rest portion and is indicated by reference numeral 16a). Furthermore, the upper part is a shoulder pad 16b curved in a forward convex shape. Of course, the upper portion can be formed in a simple backward tilted posture without providing the shoulder pad portion 16b, and a headrest can be provided integrally instead of or in addition to the shoulder pad portion 16b. Is possible.

  The back part of the shoulder rest part 16b of the backrest plate 16 is attached to the back column 8a via the left and right upper frames 17. The left and right end portions of the backrest plate 16 of the backrest plate 16 are attached to the forward tilting frame 20 via the lower frame 18 and the sixth shaft 19. The lower end of the part (and hence the lower end of the left and right intermediate part of the waist pad 16a) is connected to the bracket 22 of the forward tilting frame 20 via the seventh support shaft 21 (the forward tilting frame 20 will be described later). .

(2) Automatic backrest advancement mechanism By the way, when a person sits on a chair, he does not always sit deeply, but often sits shallowly. In this case, the posture of the person may become unstable if the backrest does not hit the person's waist. Therefore, in this embodiment, when a person is seated, the lower part of the backrest plate 16 (in other words, the lower part of the backrest 3) is moved forward, so that the person's waist is supported by the waist rest 16a of the backrest board 16 even if the person sits shallowly. In addition, when a person sits deeply, the waist resting portion 16a of the backrest plate 16 is retracted against the spring means so that the person is not prevented from sitting deeply. This point will be described with reference to FIG.

  The aforementioned front and rear support links 10 and 11 are elements of interlocking means (automatic advance mechanism) for advancing the lower part of the backrest 3 when a person is seated, and the front and rear support links 10 and 11 are inclined rearward in a side view. Accordingly, the seat 2 moves downward while being tilted by a person sitting, and the rearward tilting and lowering motion of the seat 2 is caused to move forward by the hip pad 16a of the backrest plate 16 by the interlocking means shown in the skeleton diagram of FIG. Converted. This will be described below.

  As a part of the interlocking means, the forward tilting frame 20 is connected to the rear part of the left and right swing frames 8 by a left and right eighth support shaft 24. The rear part of the forward tilting frame 20 is an upright part 20a extending upward in a side view, and the lower frame 18 is rotatably connected to the upright part 20a by an eighth support shaft 24. The lower end of the backrest plate 16 is connected to the bracket 22 formed on the portion 20 a by the sixth support shaft 19.

  Accordingly, when the forward tilting frame 20 moves forward, the waist rest 16a of the backrest plate 16 moves forward. In this case, the upper frame 17 to which the upper portion of the backrest plate 16 is attached is attached to the back column 8a so as to be vertically movable. This makes it easy for the waist pad 16a of the backrest plate 16 to move forward greatly. The structure for moving the upper frame 17 up and down with respect to the back column 8a is shown in FIG.

  That is, as shown in FIG. 2B, the hollow body 26 is connected to the upper frame 17 with two upper and lower horizontal pins 25, and the hollow body 26 is provided at the upper end of the back column 8a. The guide tube 27 is slidably fitted up and down. The upper frame 17 is urged upward by a spring 28 built in the guide tube 27. Although the upper end of the spring 28 is supported by the lower horizontally long pin 25, other support structures may be adopted. Needless to say, various structures can be adopted as the mechanism for supporting the upper portion of the backrest plate 16 so as to be movable up and down.

  Returning to FIG. 4, the description of the interlocking means will be continued. The eighth support shaft 24 that couples the forward tilting frame 20 to the swing frame 8 is inserted into the left and right first interlocking links 29 arranged on the left and right outer sides of the forward tilting frame 20, and is connected to the first interlocking link. The rear end of the link 29 and the forward tilt frame 20 are connected by a ninth support shaft 30. Accordingly, the forward tilting frame 20 and the first interlocking link 29 rotate together around the eighth support shaft 24. The first interlocking link 29 has a forward projecting portion 29 a that extends forward from the eighth support shaft 24.

  A second interlocking link 31 extending forward from the eighth support shaft 24 is disposed on the left and right outer sides of the first interlocking link 29, and the eighth support shaft 24 passes through the rear end of the second interlocking link 31. . Therefore, the front end portion of the forward tilting frame 20, the first interlocking link 29, and the rear end of the second interlocking link 31 are connected by the eighth support shaft 24. The second interlocking link 31 is rotatable about the eighth support shaft 24, and a long hole 31a for allowing relative rotation of both members 31 and 11 is formed at the front end portion thereof. The fifth support shaft 14 connecting the rear support link 11 and the seat receiving frame 7 passes through the elongated hole 31a.

  The left and right second interlocking links 31 are connected by a left and right longitudinal rear auxiliary bar 32, and a forward protruding portion 29 a of the first interlocking link 29 hits the rear auxiliary bar 32 from above. Further, a rear torsion spring 33 is fitted on the eighth support shaft 24 as an example of a back advance spring means, and the rearward end 33a of the rear torsion spring 33 is connected to the ninth support shaft 30 (or the first interlocking link). 29), the forward end 33b is applied to the rear auxiliary bar 32 (which may be applied to the second interlocking link 31) from below. Accordingly, the first interlocking link 29 and the forward tilting frame 20 are biased by the rear torsion spring 33 in a direction tilting forward about the eighth support shaft 24. In other words, the waist pad portion 16 a of the backrest plate 16 is urged by the rear torsion spring 33 in the advancing direction.

  On the other hand, the left and right rear support links 11 are integrally connected by a front bar 34, and a front torsion spring 35 is fitted on the fourth support shaft 13 as an example of a spring means, and one end 35a thereof is a front auxiliary. The bar 34 (or the rear support link 11) is applied from below, and the other end 35b of the front torsion spring 35 is applied to, for example, the back surface of the base 6 (or the lower surface of the swing frame 8). Accordingly, the rear support link 11 is biased forward by the front torsion spring 35. The front and rear support links 10 and 11 are held in a forward rotation posture by stopper means. As the stopper means, for example, the rear support link 11 may be applied to the lower surface of the seat receiving frame 7. Further, as a stopper means for restricting the backward tilting posture of the front and rear support links 10, 11, the fifth support shaft 14 may be applied to the swing frame 8 from above.

  When a person is seated, the seat 2 is moved downward and tilted against the front torsion spring 35, and the second interlocking link 31 is tilted forward, whereby the front auxiliary bar 34 is lowered. Then, since the restriction by the front auxiliary bar 34 for the first interlocking link 29 is lost, the forward tilt frame 20 is tilted forward by the rear torsion spring 33. Thereby, the waist pad 16a of the backrest plate 16 moves forward. As a result, even if a person sits shallow, the person's waist is supported by the waist rest 16a. Further, even if the second interlocking link 31 tilts forward, the forward projecting portion 29a of the first interlocking link 29 is allowed to tilt backward against the rear torsion spring 33. The waist rest 16a of the backrest plate 16 does not move forward. The spring force of the front torsion spring 35 is set larger than the spring force of the rear torsion spring 33.

  Other mechanisms can be adopted as means for advancing the waist rest portion 16a of the backrest plate 16 when a person is seated. It is also possible to advance the entire backrest plate (or backrest) 16 by seating a person. Furthermore, when applying this invention to a chair, it cannot be overemphasized that a part or all of a backrest board does not need to advance by a person's seating.

(3). Form and structure of the backrest plate Next, details of the form of the backrest plate 16 will be described mainly based on the drawings of FIG. 5A is a schematic rear view, FIG. 5B is a side view of the backrest, FIG. 5C is a sectional view taken along the line CC of FIG. 5A, and FIG. 5D is a sectional view taken along the line DD of FIG. 6 is a sectional view taken along line VI-VI in FIG. 3, FIG. 7 is a sectional view taken along line VII-VII in FIG. 3, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  The backrest plate 16 is made of a resin material having an apparent rubbery property, for example, a resin containing an elastomer. When the backrest plate 16 is not assembled in a chair, a general adult can easily hold it by hand and bend it. Can be deformed. In general, it can be said that in many cases, it has a dull appearance like urethane rubber. If any material is strictly measured, not only resin, it will be elastically deformed against bending, pulling and compression, but the degree of rubbery material is remarkable, and the backrest plate 16 of this embodiment is compressed. It is apparent that it has rubber-like properties to the extent that it can be visually confirmed that it is elastically deformed.

  The backrest plate 16 is formed with a large number of vertically elongated ridges 37 and 38 on both front and back surfaces (front and rear surfaces). For this reason, both the front and back surfaces of the backrest plate 16 are uneven. Note that the ridge and the groove are relative concepts, and the expression is different depending on where the ridge is used as a reference, but in the present embodiment, it is displayed as a ridge.

  The front protrusions 37 formed on the surface of the backrest plate 16 are set so that the height increases in the waist rest portion 16a as it goes to both left and right end portions except for the left and right intermediate portions. This is because the curvature of the backrest plate 16 can be made to follow the human waist without making it too large. Further, the higher the height of the front protrusion 37, the easier it is to fall and deform, and the contact with the human body becomes softer. However, in this embodiment, the effect of softening the contact with the left and right back portions of the human waist is also exhibited. It can be said that.

  The height of the front ridge 37 is substantially constant at the portions other than the left and right side portions of the waist pad portion 16a. Further, the height of the back ridge 38 is substantially constant throughout. The heights of the front ridges 37 and the back ridges 38 with respect to the thickness of the backrest plate 16 can be set as necessary. Moreover, the pitch of the adjacent ridges 37 and 38 can also be set in consideration of various factors such as the human body and the contact condition and design. The density (in other words, pitch) of the ridges 37 and 38 on the front surface, the back surface, or both front and rear surfaces can be varied depending on the location.

  In this embodiment, the front ridges 37 and the back ridges 38 are arranged so as to overlap in the front-rear direction, but the front and rear ridges 37, 38 are shifted to the left and right, or the left-right pitch of the front and rear ridges 37, 38. It is also possible to change. It is also possible to make the backrest plate 16 transparent, translucent, or translucent. In such a case, if the front and rear ridges 37, 38 are formed at the same position, the position of the ridges 37, 38 Has the advantage of good appearance. Further, the backrest plate 16 is elastically deformed so that the shape in plan view changes. However, if the positions of the front and rear ridges 37 and 38 are coincident, there is an advantage that such deformation is easily performed.

  As shown in FIGS. 5 (C) and 6, bearings 39 for attaching to the lower frame 18 are protruded on the back surfaces of the left and right ends of the backrest 16 a of the backrest plate 16. 39 is connected to the lower frame 18 by a bolt (which may be a pin) 40 so as to be relatively rotatable. The lower frame 18 warps in a forward concave shape in plan view, and bracket portions 18 a provided on both sides sandwiching the left and right intermediate portions thereof are connected to an upright portion 20 a of the forward tilting frame 20 by a sixth support shaft 19.

  Between the lower frame 18 and the waistrest portion of the backrest plate 16, the waistrest portion 16a of the backrest plate 16 is deformed so as to sink backward due to human body pressure (deforms so that the curvature of the forward-facing recess increases). There is enough space to allow that.

  A rearward boss portion 41 is formed at the lower end of the left and right intermediate portion of the backrest plate 16, and this boss portion 41 is connected to the bracket 22 of the forward tilting frame 20 by the seventh support shaft 21 so as to be relatively rotatable. .

  As shown in FIG. 8, the upper end of the backrest plate 16 is a horizontal piece 42 protruding rearward, and an upper horizontal rib 43 extending horizontally is formed below the horizontal piece 42. A forward-facing portion 17 a of the upper frame 17 is sandwiched between the horizontally long ribs 43. In addition, the upper frame 17 is curved in a concave shape facing forward in a side cross section, and on the lower back surface of the shoulder rest portion 16b of the backrest plate 16 is formed a thick lower horizontal rib 44 that overlaps the lower portion of the upper frame 17. Yes. For the attachment of the upper frame 17 and the backrest plate 16, an appropriate means such as forced fitting, screwing, or adhesion can be adopted.

  Since there is a space between the upper frame 17 and the shoulder frame 16b, the shoulder pad 16b can be somewhat elastically deformed so as to sink backward. However, since the upper and lower horizontal ribs 42 and 43 are present in the shoulder rest 16b of the backrest plate 16, the rigidity is high, and therefore, the shoulder rest 16b is not greatly deformed. This is because if the backrest plate 16 is excessively deformed, it will be uncomfortable.

  In the present embodiment, the back column 8a, the upper frame 17, the lower frame 18, and the forward tilting frame 20 constitute the back frame described in claim 4. Needless to say, the form of the back frame can be set freely. Needless to say, the back strut may be configured separately from the swing frame, or members such as the swing frame may not be a sheet metal processed product.

(4) Summary As already described, when a person is seated, the seat 2 is lowered and the waist rest portion of the backrest plate 16 moves forward. When the seated person leans against the backrest plate 16, the backrest plate 16 tilts backward. And since the backrest board 16 is elastically deformed greatly in a side view and a plan view, a high fit and cushioning properties can be ensured. Further, even when the person's body is directly received by the backrest plate 16, the front protrusion 37 does not receive a push-up.

  In the case of a material having a rubber-like property, it is excellent in softness and flexibility (elasticity) to the body, but for example, when a group of slits is formed, it is excessively spread and deformed, and the support function to the body is reduced instead There is a fear. On the other hand, in the present embodiment, the protrusions 37 and 38 are formed while having rubber-like properties, so that the backrest plate 16 is not excessively spread and deformed, so that the user can comfortably rest. Can be experienced.

  By the way, in a rocking chair, when leaning against the backrest, the relative position between the human buttocks and the seat is constant, whereas the so-called shirt-spinning phenomenon is caused by the tendency of the seat and the backrest to separate. In this embodiment, the lower frame 18 has a concave shape facing forward, and the rear portion thereof is connected to the forward tilting frame 20, so that the seated person leans against the backrest plate 16. 18 shows a tendency to tilt forward in a side view, and the backrest plate 16 also tends to descend. Therefore, it is possible to prevent or suppress an increase in the relative distance between the seat 2 and the backrest plate 16 and to prevent the shirt from curling. This has the advantage of preventing or significantly suppressing

  In addition, although the backrest plate 16 of this embodiment has the front surface exposed, as shown in FIG. 5C, a thin flexible surface plate 45 is stacked on the front surface of the backrest plate 16, As shown by a two-dot chain line in FIG. 5C, a cushion layer 46 may be provided on the front surface of the backrest plate 16 by an appropriate means such as insert molding. Of course, the surface plate 45 and the cushion layer 46 can be used in combination. The back surface may be left exposed or a cover may be provided.

  When the present invention is applied to a backrest plate as in the present embodiment, only the left and right intermediate portions of the upper portion of the backrest plate may be attached to the upper frame 17. Further, by attaching the backrest plate to the upper frame 17 at a position somewhat below the upper end, a portion above the upper frame 17 becomes a free end, and when the person leans on, this free end portion becomes the root. It is also possible to configure so as to fall back and deform around the center.

  It is also possible to provide a lumbar support that forcibly pushes the waist rest 16a of the backrest plate 16, and the backrest plate 16 of the present embodiment is easily deformed. Therefore, when applied to a chair having a lumbar support, its value is further increased. Demonstrated.

(5). Other Embodiments FIG. 9 and FIG. 10 show other embodiments. In this embodiment, it is displayed as an example of the body support plate 48 without being limited to the chair back plate. In the example shown in FIG. 9A, when the protrusions 49 are formed on the front and back, the height of the back protrusions 49 is made higher than that of the front protrusions 49. In the example shown in FIG. Only the protrusions 49 are formed.

  In the example shown in (C), the groove 50 is formed on the front surface of the support plate 48, and the protrusion 49 is formed on the back surface. In the example shown in (D), vertical ridges 49 are formed on the front surface of the support plate 48, and a group of vertical ridges 49 and horizontal ridges 50 are formed on the back surface. In this case, the ease with which the support plate 48 bends is set to change between the vertical direction and the horizontal direction by forming the lateral protrusions 51 on the back surface in a concave shape in plan view. As indicated by the alternate long and short dash line, it is possible to form a horizontally long lateral protrusion 51 on the front surface. In the example shown in (E), narrow and high ridges 49 are formed on the surface of the support plate 48, and low and wide ridges 49 are formed on the back surface.

  (F) In the example shown in (G), a group of protrusions such as a circle is formed on the front and back of the support plate ((G) is a sectional view taken along line GG in (F)). The shape of the protrusion 52 can adopt a form of means such as a square.

  In the example shown in FIGS. 10A and 10B, vertical and horizontal grid-like ridges 49 are formed on the front surface of the support plate 48 ((B) is a cross-sectional view taken along the line BB in (A). In the example shown in (C), oblique grid-like ridges 49 are formed on the front surface of the support plate 48. In the example shown to (D), the vertical protruding item | line 49 is formed in the front surface of a support plate, and the horizontally long protruding item | line 49 is formed in the back surface ((E) is EE view sectional drawing of (D). ). (F) In the example shown in (G), the ridges 49 are formed inside the peripheral edge of the support plate 48, and in the example shown in (G), the ridges 49 are formed intermittently. .

  Each of the above examples was a case where the backrest plate was an integral structure, but FIGS. 10 (H) and (I) show an example in which a composite structure is formed by an insert molding method or a two-color molding method, or a pair is bonded or the like. Yes. Among these, in the example shown in (H), the flat base layer 48a and the concavo-convex layer 48b having the ridges 49 are integrated. The uneven layer 48b is preferably made of a pure rubber material such as a rubbery material or an elastomer. In the example shown in (I), only the ridge 49 is formed of a rubber-like material.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, as an application object, it can also be used for a seat plate of a chair. Further, the outer diameter and thickness of the support plate can be variously set according to the target product.

(7). Advantages of First Embodiment This embodiment includes a unique improvement related to a chair with a backrest. This point will be described next.
There are various types of chairs, and various improvements are made according to the types. As an example, for example, Patent Document 1 (Japanese Patent Publication No. 44-20784) discloses a chair whose seat tilts forward when a seated person leans against the backrest, while Patent Document 2 (Japanese Patent Publication No. 46-2002). Japanese Patent No. 27517) describes a chair in which when a person is seated, the seat tilts in a side view centering on a substantially middle portion of the seat, and the backrest tilts in conjunction with the rear tilt of the seat. ing. Both patent documents employ a kind of link mechanism as means for interlocking the backrest with the seat.

  In the case of Patent Document 1, the posture of the seat and the backrest is not changed only by the person sitting, and when the seated person leans on the backrest and a large moment is applied to the backrest, the rear part of the seat is pushed upward by the lever principle. It is intended to tilt the seat forward, and its purpose is to ensure a comfortable state by making it easier to stretch the human body in the locked state.

  On the other hand, in Patent Document 2, for example, when a person sits on the front part of the seat, the backrest greatly tilts forward to push the person into a forward tilted posture, and the user feels uncomfortable and shifts the sitting position backward. It will be. That is, in Patent Document 2, a so-called “chung (or choi)” that a user sits on the front part of a seat gives a discomfort and a correct sitting posture. (End of background).

  When a person uses a chair, he does not necessarily sit deeply, but often sits shallowly. Since the use of chairs varies from person to person, the design philosophy of the chair also requires a user-friendly idea to minimize the burden on the user even if the sitting position is different (such as in offices). It is often necessary to sit shallowly in business, so there is a high need to consider such usage.)

  However, the thing of patent document 1 is only assumed that it is in a rocking state, and no consideration is given to what is called a shallow sitting. On the other hand, the thing of patent document 2 is trying to make the user put on the heel which sits down deeply, and it is hard to say that this also considers a user enough.

  Furthermore, in order to reduce the burden on the body of a person who has been seated, it is important to support the person's waist and make it easier to take a state where the back is stretched. A chair with a lumbar support that supports it in a concentrated manner is prevalent, but since the one in Patent Document 2 tilts the entire backrest forward, the user of the chair is pushed by the backrest at the top of the backrest. As a result, the spine is not stretched, and therefore the lumbar support function cannot be secured in Patent Document 2.

  Furthermore, the configuration of Patent Document 2 has a problem that when a person sits shallowly, the seat is inclined forward, and it is difficult for the person to take an upright posture with the upper body extended.

  The backrest support mechanism described in the present embodiment is also intended to improve the current situation, and it is an object to provide a more user-friendly chair. (In the above, the “problem to be solved by the invention” in the disclosure of the invention).

  In the present embodiment, as means for solving the above-described problems, a seat, a backrest on which a seated person's back and waist can hit, and interlocking means for projecting forward at least the lower part of the backrest when the person sits down. However, this interlocking means includes spring means for advancing at least the lower part of the backrest by the seating of a person, and the backrest can be moved backward against the spring means.

  Furthermore, the invention of this embodiment is preferably a. The chair has a swing frame having a back column (the back column may be an integral structure with the swing frame or a separate structure), and the upper part of the backrest is attached to the back column so as to be able to move down. Structure, b. The interlocking means includes a link mechanism, and the spring means for advancing at least the lower part of the backrest by seating is a torsion spring fitted on a shaft connecting the links; c. The interlocking means includes a backrest advance frame having an upright portion, and includes a configuration in which at least a waist rest portion of the backrest is connected to the upright portion of the advance frame so as to be relatively rotatable.

  According to this embodiment, when a person is seated, at least the lower part of the backrest protrudes forward, so that even if the person sits shallowly on the seat, the seated person's waist can be supported from behind by the backrest. That is, the backrest can exhibit a lumbar support function, and therefore, the burden on the user's body can be remarkably reduced even in a shallow stool like a so-called chest.

  Since the backrest is moved forward by the spring means, for example, when the user sits down deeply, the backrest can be prevented from moving forward, and therefore there is no inconvenience when sitting up deeply. In this case, if a torsion coil spring is used as the spring means, the spring only needs to be wound around a shaft for connecting the links, so that the installation space for the spring is substantially unnecessary, and therefore the interlocking means can be remarkably compact. There are advantages.

  In addition, when a backrest advance frame with an upright part is used, the backrest advance frame can be arranged so as to be hidden under the seat or inside the back column, so that the interlocking means protrudes from the back of the chair or the left and right outside of the seat. This can be further reduced in size. Further, compaction can also be achieved by configuring the interlocking means with a group or frame of links arranged on the left and right below the rear part of the seat as in the embodiment. Each link and frame can be set in various cross-sectional shapes such as a plate shape, a pipe shape, and a solid bar shape. Moreover, when the forward-facing concave lower frame 18 is used in a plan view, the links can be gathered into the inner portion sandwiched between the left and right back posts, and therefore the size can be further reduced. (Effects of the invention).

It is a schematic perspective view of the chair which concerns on 1st Embodiment. (A) is a schematic right side view of the chair, and (B) is a cross-sectional view taken along the line BB of (A). It is a schematic rear view of a chair. It is a mechanism figure which shows the interlocking relationship between a seat and a backrest. (A) Schematic rear view, (B) is a side view of the backrest, (C) is a sectional view taken along the line CC of (A), and (D) is a sectional view taken along the line DD of (A). FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. FIG. 7 is a sectional view taken along line VII-VII in FIG. 3. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 3. It is a figure which shows other embodiment. It is a figure which shows other embodiment.

Explanation of symbols

2 seats 3 backrest 8 swing frame 8a back column 16 backrest plate 17 upper frame 18 lower frame 37, 38 ridge

Claims (4)

A resin support plate that supports a human body directly or via a cushioning material such as a cushion material, and has a flexibility to bend and deform against elasticity, and at least a large number of elongated shapes on the surface Protruding strips or groove strips are formed, and further, at a plurality of locations around the periphery, mounting portions are provided that can be attached to the frames in a state that allows bending deformation due to human body pressure.
Body support plate. The ridge group or groove group is formed so as to extend substantially in parallel, and these ridge group or groove group extends long in the same direction as the height direction of the person,
The body support plate according to claim 1. It is a resin support plate that supports the human body directly or via a cushioning material such as a cushioning material, and is made of a material that has rubber-like properties and elastically deforms due to human body pressure. At a plurality of locations around the periphery, mounting portions are provided that are attached to the frames in a state of being supported at both ends.
Body support plate. A chair in which at least the backrest plate of the backrest plate and the seat plate is composed of the body support plate according to any one of claims 1 to 3, and a back frame is arranged on the back side of the backrest plate,
The front surface of the backrest plate is formed in an uneven shape in a flat cross section by forming a number of vertically extending and protruding ridges or grooves on the front surface, and the lower end of the backrest plate is below the waist of the seated person The upper part of the backrest plate is attached to the back frame, and the part of the backrest plate where the seated person's waist hits is in a state of supporting both ends by attaching the left and right ends to the back frame,
Chair.

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