KR100414831B1 - Seat board of chair and a student chair using thereof - Google Patents

Abstract

PURPOSE: A seat plate for a chair and a student's chair using the seat plate are provided to enable a user to sit on the chair without fatigue due to taking the same posture for a long time by evenly distributing a load concentrated on two end parts of an ischial tuberosity portion of the user throughout the hips, and by reducing or removing pressures applied to the thighs and the coccyx. CONSTITUTION: The seat plate for a chair comprises: a body(10); a hip recess(11) formed on a surface of the body(10), for accommodating a part of user's hip; a thigh recess(12) for accommodating parts of the thighs; a compression preventing groove(13) in which user's private parts are seated for preventing the private parts from being compressed; and a coccyx accommodating groove(14) for accommodating the coccyx.

Description

Seat board and chair for students using same

The present invention relates to a chair, and more particularly, to improve comfort by ergonomically designing the upper surface of the seat that supports the user's buttocks while evenly distributing pressure acting on the user's buttocks when seated. It is related to a chair seat that allows sitting for a long time in a proper posture with a chair.

The chair is one of the important living furniture that has been closely related to our life since ancient times, and is an important living product that is indispensable for the life of modern people. With the development of civilization, modernity has shifted from physical labor-intensive lifestyle to mental labor-intensive lifestyle, and as a result, the sedentary culture has naturally expanded as the proportion of static activity has increased compared to dynamic activity.

As a result, modern people have not only used chairs in many parts of their daily lives (home, school, work, transportation, etc.), but the use time of chairs has also increased greatly, so it is no exaggeration to say that most of life is with the chair. As such, the proportion of chairs in modern life is very high.

Therefore, not only have they demanded a more comfortable and comfortable chair when sitting, but also the interest in health has been greatly increased due to the improvement of living standards, which also shows great concern for the health harm caused by the chair life.

On the other hand, the chair generally consists of a seat plate supporting the buttocks and thighs of the seated person, and a leg frame and a backrest to support the seat plate at an appropriate height. It can be important.

In other words, the chair is a tool for a person to sit comfortably, and the comfort of seating should be given priority. For this purpose, the role of the backrest is important, but the role of the seat that supports the seat of the seat is most important. There is no choice but to.

However, until now, chairs have been produced with a focus only on the eyes and the senses without considering the function of the seat, so it was difficult to sit on the chair for a long time and sat in the correct position such as twisting the body frequently while sitting. It was not enough to be.

This phenomenon can be clearly understood in view of the engineering studies of the supporting device and the structural studies of the human skeleton.

For example, when industrial engineer Branton sits on the flat seat 1 of a typical chair as shown in FIG. 1, about 75% of the weight is about 0.26 at both ends of both sciatic nodules. It is revealed that it is supported by ㎡, the load of the seated person (U) is concentrated at the two ends of the sciatic nodules when sitting, and it is revealed that a very strong pressure is applied to the sciatic nodules (I). In the figure, the size of the arrow is a relative expression of the load acting on the bottom of the buttocks (B) of the user.

In addition, the industrial engineer Tichauer has a buttock pressure of 38,6 to 45.3 kg per 6.5 cm2, and a weight of down pressure between the buttocks and the hard chair surface is 18.1 to 27.2 kg per 6.5 cm2. It was set to 1.8 kg per 5.6 cm2 at a position 5-7 cm away from the site.

As can be seen, the conventional seat plate (1) is concentrated in the pressure due to the load of the human body at the two ends of the sciatic nodules (I) at the time of sitting, so that when sitting for a long time, local anemia symptoms in the buttocks (B) Blood circulation disorders occur, such as pain and paralysis symptoms will cause severe fatigue and discomfort for the seated person (U). This causes frequent spine abnormalities by changing posture or twisting body during sitting, which is a problem that has a particularly bad effect on the health of children and adolescents in the growing phase.

Accordingly, in recent years, various types of seats have appeared to maintain a comfortable seating state without harming health, and these technologies are disclosed, for example, Korean Utility Model Registration No. 1986-0001937 and Korean Utility Model Publication No. 1999- 004688 and US Pat. No. 5,522,447.

Utility Model Registration No. 1986-0001937 forms a substantially U-shaped curved portion on the upper surface of the seat plate so that the buttocks and thighs of the seat can be seated, and a plurality of through holes for ventilation are formed in the curved portion.

However, this technique is not simply considering the distribution of the human body load when sitting, but simply curved the shape of the bottom and thighs as it is to form a curved portion, so it is difficult to expect the pressure dispersion effect, and sitting for a long time still causes fatigue and pain.

In addition, there is a concern that the local part of the seated person is in contact with the protrusion formed between the two thigh seating portions of the curved portion, and thus, in particular, a female may be subjected to sexual stress.

Utility Model Publication No. 1999-004688 discloses that the bottom of the buttocks is immersed into the buttock cavity when seated, so that the bottom of the buttocks is immersed in the buttock cavity to maintain proper sitting posture and prevent spinal diseases and prevent skin diseases by gout. It has the advantage, but sitting for a long time there is a problem causing local blood circulation disorder around the sciatic nodules.

That is, as shown in FIG. 2, when the seated person U sits on the seat plate 2, the bottom of the buttocks B is immersed into the buttock cavity 3 so that both ends of the sciatic node I are also seated together ( It is immersed into the buttock 3 of 2) and the sciatic nodules I remain in the air.

Therefore, the resistive force due to the seat plate 2 does not work at the end of the two sciatic nodules (I), but the human body load is concentrated around the sciatic nodules (I) in contact with the edge of the buttock tooth (3). Is severely pressed by the seat plate (2) to cause a blood circulation disorder (e.g., the same phenomenon that occurs when sitting on the toilet for a long time), the pain and paralysis will occur.

In addition, when the seated person (U) is sitting on the seat plate (2) for a long time, the two ends of the sciatic nodules (I) are immersed into the buttocks (3) over time, as shown by the dotted arrow There was a possibility that a strong pressure by the main surface of the buttock 3 of the seat plate 2 acts on both sides of the sciatic node I, and the sciatic node I was deformed.

On the other hand, U. S. Patent No. 5,522, 447 has a first piece in the form of a horseshoe, a second piece in the form of a horseshoe located in the first piece, a third piece in the shape of a wedge that is tapered toward the rear in the second piece, and It is located in the second piece so as to surround the third end of the third piece and consists of a fourth piece of elliptical shape that is long in the width direction, wherein the first and third pieces are relatively hard and the second and fourth pieces are relatively soft porous elastic materials. By being configured to be uniform pressure acting on the buttocks corresponding to the anatomical shape of the human body when sitting.

However, this technique is difficult to sit at the correct position because the 1-4 pieces of the seatboard have the same height and are combined with each other to form a flat body, and if the seating position is incorrect, the pressure on the buttocks is uneven. You lose.

In addition, it is difficult to maintain the seating position correctly, and in particular, the local part of the seater contacts a relatively hard third piece, and there is a fear of pressure in the male and sexual stress in the female.

The present invention has been devised to solve the above-mentioned conventional problems, blood circulation disorder and pain and local paralysis symptoms due to pressure concentration by distributing the load acting on both ends of the sciatic nodules evenly in the buttocks when sitting The purpose of the present invention is to provide a chair seat that allows the user to sit comfortably for a long time in a correct posture without disturbing the posture by fixing the buttocks of the seated person to a predetermined seating position while minimizing the back.

Another object of the present invention is to properly disperse the pressure of the thigh where the next large load is applied after the two ends of the sciatic nodules when sitting, and to provide a smooth blood circulation during sitting by eliminating the pressure applied to the tailbone It is to provide a seat for the chair.

Still another object of the present invention is to provide a seat plate for a chair that prevents blood circulation disorder due to compression of a local part in a seated man and minimizes sexual stress due to local pressure in a woman.

It is still another object of the present invention to provide a student chair suitable for use in a classroom in which the seat plate of the present invention is to be sat for a long time.

1 is a cross-sectional view schematically showing the load distribution acting on the buttocks when sitting on a seat for a general chair;

2 is a partially enlarged cross-sectional view showing a problem of another example of the conventional seat plate;

3 is a perspective view showing a seat plate for a chair according to the present invention;

4 is a plan view of a seat plate for a chair according to the present invention;

5 is a cross-sectional view taken along the line VV of FIG. 4;

FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 4;

7 is a cross-sectional view taken along the line VII-VII of FIG. 4;

8 is a cross-sectional view taken along the line VII-VII of FIG. 4;

Fig. 9 is a sectional view seen from the side showing the upper body of the seated person being folded back;

10 is an exploded perspective view showing a student chair according to the present invention;

11 is a cross-sectional view of the coupled state of FIG.

12 is a cross-sectional view taken along the line II-II of FIG. 11;

Figure 13 is an enlarged cross-sectional view showing an excerpted state of the seat plate;

14A and 14B are a plan view and a side view illustrating the action and position adjustment of the backrest.

<Description of Symbols for Main Parts of Drawings>

10: seat body 11: hip recess

12: Thigh recess 13: Local compression prevention groove

14: tailbone receiving groove 15: cushioning material

20: legframe 24: bracket

30: Back 31: Back frame

32: back panel 33: spring bracket

34: support plate 35: fixed knob

40: seat 41: buttocks recess

42: thigh recess 43: local compression prevention groove

44: tailbone receiving groove 50: shelf

60: Footrest U: Seater

I: Sciatic nodules B: Buttocks

T: Thigh C: Tailbone

In order to achieve the above objects, the seat plate for the chair according to the present invention is mounted horizontally on the leg frame of the chair to support the buttocks of the seated person, and is formed at a predetermined depth in the rear center of the upper surface and is long in the horizontal direction. A butt recess having an elliptical shape to accommodate and support a part of the buttocks of the seated person and having an approximately inverted trapezoidal cross section; A thigh recess positioned at both front sides of the buttocks recess, the front opening being open, and having a curved bottom with a predetermined curvature in the left and right directions to accommodate a part of the thigh of the seated person; A local pressure preventing groove formed between the buttocks recess and the thigh recess to communicate with the buttocks recess to receive a local part of the seated person; And a tailbone receiving groove formed in communication with the buttocks recess at the rear center of the buttocks recess and accommodating the tailbone of the seated person.

According to this preferred feature of the present invention, there is provided with a flare that is gradually deepened as the depth of the femoral recess is advanced toward the front and gently bent downward at the front end of the femoral recess.

According to another preferred feature of the present invention, the body is made of a hard material having a certain thickness, the buttocks recess, thigh recess, local pressure preventing groove and the tailbone receiving groove is formed by molding the body into a predetermined shape.

In addition, the student chair according to the present invention comprises: a leg frame configured to form a predetermined shape by continuously bending the bar; A hip recess formed at a predetermined depth in the rear center of the upper surface to receive a part of the buttocks of the seat, a thigh recess for receiving a part of the thighs of the seat and positioned so that the front surface is open to both front sides of the butt recess; A seat plate fastened on the leg frame with a local pressure preventing groove formed to communicate with the buttocks recess between the recess and the thigh recess and a tailbone receiving groove formed to communicate with the buttocks recess at the rear center of the buttocks recess; A backrest extending upwardly installed at the rear end of the leg frame; A shelf installed in the leg frame to be positioned below the seat plate; And two footrests respectively installed on both sides of the front end of the shelf and on which the seated person can put their feet.

Accordingly, the present invention, while the pressure acting on the sciatic nodule of the seated person is properly distributed, the buttocks are fixed to provide a comfortable seating feeling to the user, thereby reducing fatigue and allowing the user to sit in a chair in a right posture at all times.

In addition, the pressure of the thigh, which is the second largest load next to the sciatic nodules, is also reduced by proper dispersion, and the pressure applied to the local and tailbone is minimized, resulting in greater comfort, reliability, and safety. Done.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

3 and 4, the seat plate for the chair according to the present invention includes a buttocks recess 11 for receiving a part of the buttocks B of the seated person U on the upper surface of the body 10, and the seated person U. The thigh recess 12, which receives a portion of the two thighs of T, respectively, and the local pressure preventing groove 13 and the tailbone C of the seated person U, where the localized area of the seated person U is placed. The tailbone receiving groove 14 is configured to be.

The body 10 may be formed by digging elements such as the buttocks recess 11 from its upper surface in a flat plate having a predetermined thickness in consideration of the depth of the buttocks recess 11, but preferably a hard plate having a predetermined thickness as a whole. It is configured by molding necessary elements such as the buttocks recess 11 in the form of bending. For example, it can manufacture by shape | molding plywood, an improved timber, synthetic resin, etc. with a predetermined metal mold | die.

The buttocks recess 11 is located at the center behind the upper surface of the body 10, and is configured based on an ergonomic perspective in consideration of the skeleton structure of the human body. Accordingly, the buttocks recess 11 has an elliptical shape in which the major axis is arranged in the left and right directions when viewed in a plan view, and as shown in FIGS. 5 and 6, only a portion of the bottom of the buttocks B may be accommodated when seated. The lower edge of the buttocks (B) is on the upper surface of the body (10) around the buttocks recess (11) while the two sciatic nodules (I) of the seated person (U) slightly touch the bottom surface (11a). It has a depth that can span.

And the wall surface 11b of the buttocks recess 11 is the bottom of the buttocks B so as to gently wrap around the bottom of the buttocks B of the seated person U accommodated therein, that is, the sciatic nodules I. It is composed of an inclined surface corresponding to the curved surface. Thus, the buttocks recess 11 has a cross section of an approximately trapezoidal shape. At this time, it is preferable to treat the corner portions of the upper surface and the bottom surface 11a of the body 10 which meets the wall surface 11b of the buttocks recess 11 as a smooth arc-shaped curved surface having an appropriate radius.

The size of the buttocks recess 11 is configured differently depending on the physical condition of the seated person (U). That is, children or adolescents or mature adults in the growth phase is different depending on the use class because their body shape is different, each size can be configured based on the average body shape of the hierarchy.

For example, the average distance between two ends of sciatic nodules (I) is 140-160 mm for women and 150-170 mm for women. In consideration of the thickness of the buttocks, the inclination of the wall 11b at the long axis size a = 240 ± 30mm, the short axis size b = 160 ± 20mm and the depth d = 20 ± 5mm is about 30 based on the bottom surface 11a. It can be configured as a gentle curved groove having an inclination of ˜45 °.

The thigh recess 12 is located in front of the upper surface of the body 10, that is, the front both sides of the buttocks recess 11, respectively long and arranged in the longitudinal direction, as shown in Figs. ) Has an arc-shaped cross section with a predetermined curvature from the front to support the bottom of the thigh of the thigh softly, and its front end has a bottom of the thigh of the seated person U longer than the length of the thigh recess 12. It is open to certainty.

The size of the thigh recess 12 is also appropriately configured according to the user's body shape, and the size is configured in consideration of the thickness of the flesh on the average thigh size of the use layer.

On the other hand, in general, when the seated person (U) is sitting on the chair, the thighs (T) are not exactly horizontal, but the knee side is located at a slightly lower level, and the depth of the thigh recess (12) is preferably forward. It is constructed to be progressively deeper and has a gentle slope slightly lowered from its front side when viewed from the side.

In addition, the thigh recess 12 has a form in which the left and right widths gradually widen toward the front so that the thigh portion T of the seated person U can be uniformly contacted and supported on all sides.

In addition, when the seated person (U) is sitting in a chair, both thighs (T) is generally spread out on both sides around the buttocks (B), so that each thigh recess (12) is viewed in a flat plane for more comfortable sitting Opening at an appropriate angle with respect to the short axis of the recess (11) to form an approximately V-shape.

On the other hand, the postures of people sitting on chairs are slightly different.In particular, the legs are evenly placed with both feet even on the floor, but most of them extend their feet forward or bend their knees slightly. It is located at the bottom of the seat plate.

In this case, the load of the thigh is gathered at the front end of the seat plate, that is, at the front end of the thigh recess 12, and the corresponding part of the thigh T is pressed by the seat plate. Therefore, the seat plate of the present invention is a flared portion bent at a proper curvature at the open front end of the two thigh recesses 12 so that the pressure concentration on the specific portions of the thighs T is minimized regardless of the leg position of the seated person U. (12a).

The local pressure preventing groove 13 is located at the center between the buttocks recess 11 and the thigh recess 12 and is formed to communicate with the buttocks recess 11. The local compression prevention groove 13 is only necessary to prevent the contact of the local site in the case of women, but in the case of men should be able to accommodate the local site enough to be formed in the appropriate size in consideration of the size of the local site of the male.

The tailbone receiving groove 14 is located at the rear center of the buttocks recess 11 and communicates with the buttocks recess 11. The tailbone receiving groove 14 is for preventing the pressure caused by the lower end of the tailbone (C) in contact with the seat plate when seated, for example, the back of the buttocks (B) when the seated person (U) leans back the upper body It is formed into an appropriate size in consideration of sliding into the buttocks recess 11.

The remaining reference numeral 16 is a boss protruding from the lower portion of the body 10 to fasten the seat plate to the leg frame, 17 is a leg frame, and 18 is a backrest.

Chair seat plate according to the present invention having such a structural feature, when the user is seated on the chair part of the buttocks (B) bottom part of the seated person (U) is immersed in the buttocks recess 11, and the two thighs ( The bottoms of T) are respectively seated in corresponding thigh recesses 12 on the seat plate.

At this time, the two ends of the sciatic nodules (I) of the buttocks (B) slightly touch the bottom surface 11a of the buttock recess (11), and the bottom of the buttocks (B) around the sciatic nodules (I) is the buttocks recess ( The bottom edge portion of the buttocks B is placed on the upper surface of the seat plate body 10 around the buttocks recess 11 so that the buttocks B are placed on the seat plate corresponding to the skeletal structure. Evenly contact

Therefore, the body load is not concentrated on any specific site as in the prior art, and is evenly distributed over the entire portion of the bottom of the buttocks B, and the buttocks are separated from the edges of the bottom of the buttocks B which contact the upper surface of the seat plate around the buttocks recess 11. The two ends of the sciatic nodules I immersed in Seth 11 are relatively even.

That is, most of the load concentrated at the two ends of the sciatic nodules (I) when seated due to the skeletal structure of the human body is distributed widely to the bottom outer portion of the buttocks (B) by the seat plate corresponding to the human skeletal structure. As a result, blood circulation disorders in the bottom of the buttocks (B) due to pressure concentration are not generated, and pain and local paralysis are hardly generated.

Therefore, even if you sit in a chair for a long time, not only do you need to twist or change the posture, but also the buttocks B are fixed by the buttocks recess 11, so that the seated person U continues the correct posture. This can lead to normal physical development while preventing spinal abnormalities in youth and adolescents, especially those who have a long period of chair life while growing up.

In addition, the buttocks recess 11 provides a seating criterion of the buttocks B during sitting, and the buttocks B are out of this reference position during the seating and the posture is distracted. ) Will naturally lead to the recessed recesses (11).

Therefore, unlike the case where the buttocks B are slipped by using the cushioning material as in the case of a conventional chair, the present invention can reliably prevent slipping regardless of the material of the seat plate.

In addition, the bottoms of the two thighs T, which are placed next to the end of the sciatic nodules I, are also accommodated in the corresponding thigh recesses 12 and are evenly held in contact with each other. This minimizes the pressure concentration phenomenon. In particular, since the thigh recess 12 is gently inclined toward the front, the bottom of the thigh T naturally sits evenly on the seat plate to effectively disperse the pressure applied to the thigh T.

In addition, since the local compression prevention groove 13 is provided in the front center of the buttocks recess 11, in the case of men, the local part is accommodated therein to prevent compression, thereby preventing blood circulation disorders in the local area, as well as in women. There is no contact with the local area, so you will not receive any sexual stress.

In addition, since the tailbone receiving groove 14 is formed at the rear center of the buttocks recess 11, the tailbone C is not pressed at the time of seating, so that the tailbone C is seated on the seat plate even when the upper body is folded back in the seated state. Pain caused by contact never occurs.

On the other hand, Figure 9 shows another embodiment of a seat plate for a chair according to the present invention.

This is a configuration in which the cushion member 15 having a proper cushion is further attached to the upper surface of the seat plate body 10 in the above-described configuration, and preferably, the cushion material 15 is a buttocks recess formed in the seat plate body 10. 11), has a geometrically curved shape corresponding to the thigh recess 12, the local compression prevention groove 13 and the tailbone receiving groove 14. At this time, each of the recesses 11 and 12 and the grooves 13 and 14 of the seat plate body 10 may be formed to be larger than when formed alone in view of the thickness of the cushioning material 15.

Embodiment of this configuration is to increase the comfort at the time of seating than the above-described embodiment to further reduce the pressure acting on the buttocks (B) it is possible to maintain a more comfortable sitting state.

On the other hand, the seat plate of the present invention can be applied to any type of chair, in particular a bar that can be adapted to the student chair that must be sitting on the chair for a very long time, the student chair to be provided in the classroom Let's take an example.

10 to 12, the student chair according to the present invention includes a leg frame 20, a backrest 30 supported on the rear end of the leg frame 20, and a seat plate mounted on the leg frame 20 ( 40 and a shelf 50 installed in the middle of the leg frame 20 so as to be positioned below the seat plate 40, and two footrests 60 mounted at the front end of the shelf 50.

Leg frame 20 is produced by continuously bending a pipe having a suitable diameter, and has a substantially c-shape from the side. In addition, the leg frame 20 has a narrow upper portion and a large lower portion for stable support.

Plate-shaped brackets 24 for mounting the seat plate 40 are fixed to the two upper horizontal portions 21 of the leg frame 20 by welding, and reinforcement between the two vertical portions 22 of the leg frame 20. Bars 25 are arranged horizontally so that both ends are welded at each end.

Preferably, support blocks 26 made of synthetic resin or the like are mounted at opposite ends of the two lower horizontal portions 23 of the leg frame 20, which support blocks 26 are, for example, approximately C thereon. It may be elastically coupled to the leg frame 20 by integrally provided with a clip (clip: 27) of the mold.

The backrest 30 includes a back frame 31 welded to the bracket 24 of the leg frame 20, and a back panel 32 mounted to the back frame 31. The back frame 31 is formed by bending the pipe into a U shape and then bending it back to an approximately L shape. The back panel 32 is composed of a curved shape of a geometric shape so as to support the back of the human body, for example, may be composed of a hard material such as synthetic resin or wood. Here, of course, an appropriate cushioning material (not shown) can also be attached to the surface as needed.

The back panel 32 may be directly fixed to the back frame 31, but is preferably mounted through a spring bracket 33 of a predetermined type so that appropriate flow can be given to the back panel 32 in consideration of the dynamics of the human body. do.

That is, as shown in FIG. 14A, the spring bracket 33 is formed by fastening the spring bracket 33 having both ends bent in multiple stages so as to correspond to each other on the rear surface of the back panel 32, and placing the spring bracket 33 on the front of the back frame 31. After mounting the support plate 34 on the back of the back frame 31 is mounted by screwing the fixing knob 35 to the support plate 34 and the spring bracket 33.

At this time, it is preferable to fix the position of the support plate 34 by simply elasticity with the spring bracket 33 without bonding to the back frame 31. Accordingly, as shown in FIG. 14B, the fixing knob 35 is unfastened. Through the tightening operation, the position of the back panel 32 can be freely adjusted to a desired position according to the body shape of the seated person U, thereby providing a more comfortable seating feeling.

The seat plate 40 is manufactured by, for example, injection molding a synthetic resin, of course, may be made of a hard material such as wood or plywood. A buttock recess 41 is formed in a central portion behind the upper surface of the seat plate 40 to receive and seat a portion of the buttocks B of the seated person U, and the seated person U is provided at both front sides of the buttocks recess 41. Two thigh recesses 42 are formed in which a portion of the two thighs T of the house is accommodated.

In addition, between the buttock recess 41 and the thigh recess 42, a local pressure preventing groove 43 for receiving a local portion of the seated person U is formed to communicate with the buttocks recess 41. At the rear of the set 41, a tailbone receiving groove 44 in which the tailbone C of the seated person U is received is also formed to communicate with the buttocks recess 41.

In addition, although not separately illustrated, a cushion member having a shape corresponding thereto may be further provided on the upper surface of the seat plate 40 as necessary.

As shown in Fig. 13, the seat plate 40 is provided with four fastening bosses 45 at the bottom thereof, and fastened to the bracket 24 of the leg frame 20 by bolts 47. To this end, the nut 46 is integrally inserted into the boss 45 of the seat plate 40 when the seat plate 40 is molded.

On the other hand, the details of such a seat plate 40 is the same as the configuration of the seat plate described above, it will be omitted to avoid overlapping description.

The shelf 50 is for students to easily store items such as bags, and may be configured in various forms. For example, the shelf 50 may be formed by joining steel having a proper diameter in a mesh form. In addition, if necessary, the edge 51 of the appropriate height may be provided at its edge to prevent the article from being detached.

The shelf 50 is the front edge is bonded to the reinforcing bar 25 of the leg frame 20, the rear edge thereof is bonded to a separate support bar 52 to the support bar 52 to the leg frame 20 It is installed on the leg frame 20 by welding to the lower horizontal portion 23 of the.

On the other hand, the footrest 60 is composed of, for example, a metal plate may be bonded to both sides of the reinforcing bar 25 of the leg frame 20, respectively. At this time, each footrest 60 preferably has a proper angle of inclination so that the front end is inclined downward in consideration of the ergonomics of the seated person (U).

The footrest 60 can put the foot (F) naturally during seating, the existing student chairs to interfere with the shelves provided in the leg frame 20 when trying to position the foot backwards while sitting It allows you to stay seated in a more comfortable state while eliminating it.

The operation effect of the student chair according to the present invention configured as described above is the same as the seat plate described above except for the backrest 30 and the shelf 50 and the footrest 60, and thus will not be repeated.

According to the seat plate according to the present invention as described above, most of the human load concentrated at the two ends of the sciatic nodules when seated is distributed to the entire bottom of the buttocks, as well as the next femoral section to the next large load Since the load is also properly distributed, and relatively even pressure is applied as a whole, even when sitting in a chair for a long time, it is possible to sit comfortably in a correct posture without making frequent posture changes during sitting.

In addition, by providing a seating position of the buttocks when seated, when the seated person is out of position naturally leads to the phenomenon of returning to the original position, thereby allowing you to always sit in the right posture, It is particularly useful for correct skeletal formation and spinal correction in adolescents.

In addition, the local compression prevention groove effectively prevents the local site compression of the seated person can prevent ischemia in men, and in the case of women can minimize sexual stress contributes to the prevention of urinary diseases.

In addition, the student chair according to the present invention also has the same effect as the seat plate described above, can be fixed to the optimal position to fit the body of the seat and can be mounted comfortably foot rest on the footrest during sitting a lot of time Students will be able to provide optimal sitting position and comfort for those who need to live in a chair.

Therefore, the present invention greatly improves the comfort, reliability and safety of the chair, as well as a very useful technology that can be expected to prevent urinary diseases due to long-term seating and chiropractic.

Claims (14)

As a seat plate seated horizontally on the leg frame of the chair to support the buttocks of the seater, A butt recess formed at a predetermined depth at a rear center portion of the upper surface and configured to have a long oval shape in a horizontal direction to accommodate a portion of the buttocks of the seated occupant and having a cross section of a substantially trapezoidal shape; Thigh recesses positioned at both front sides of the buttocks recess, the front openings being open, and having a curved bottom with a predetermined curvature in the left and right directions to accommodate and support a part of the thighs of the seated seat; A local pressure preventing groove formed between the buttocks recess and the thigh recess so as to communicate with the buttocks recess to receive a local part of the seated person; And a tailbone receiving groove formed in communication with the buttocks recess at the rear center of the buttocks recess for accommodating the tailbone of the seated seat. delete delete The seat plate of claim 1, wherein a depth of the thigh recess is gradually deepened toward the front. 5. The chair seat according to claim 4, wherein the front end of the thigh recess is provided with a flare that is gently bent downward. 6. The chair seat according to any one of claims 1, 4 and 5, wherein the two thigh recesses are respectively inclined at an appropriate angle with respect to the front and rear short axis of the hip recess. 7. The chair according to claim 6, wherein the body is made of a hard material having a predetermined thickness, and the buttock recess, the thigh recess, the local pressure preventing groove and the tailbone receiving groove are formed by molding the body into a predetermined shape. Seat plate. The seat plate for a chair according to claim 1 or 6, further comprising a cushioning material having appropriate elasticity on the body. The seat plate for a chair according to claim 8, wherein the cushion member has a shape corresponding to the surface of the body. A leg frame configured to be continuously formed by bending a bar; A hip recess formed at a predetermined depth in the rear center of the upper surface to receive a part of the buttocks of the seat, a thigh recess for receiving a part of the thighs of the seat and positioned so that the front surface is open to both front sides of the butt recess; A seat plate fastened on the leg frame with a local pressure preventing groove formed between the recess and the thigh recess to communicate with the buttocks recess and a tailbone receiving groove formed at the rear center of the buttocks recess to communicate with the buttocks recess; A backrest extended upwardly from the rear end of the leg frame; A shelf installed in the leg frame to be positioned below the seat plate; And Student seat, characterized in that it is installed on both sides of the front end of the shelf, two footrests that the seated person can put their feet. The seat plate of claim 10, wherein the seat plate is made of a hard material having a predetermined thickness, and the buttock recess, the thigh recess, the local compression prevention groove, and the tailbone receiving groove are formed by molding the seat plate into a predetermined shape. Student chair. The student chair according to claim 10 or 11, further comprising a cushioning material having appropriate elasticity on the seat plate. The back frame according to claim 12, wherein the backrest is joined to the leg frame, a back panel mounted on the back frame to support the back of the seated occupant, and bent in multiple stages so that both ends thereof face each other. A spring bracket fixed to the back frame and contacting the front surface of the back frame, a support plate contacting the rear surface of the back frame, and a fixing knob screwed to the support plate and the spring bracket simultaneously, so that the back panel is positioned relative to the back frame. Student chair, characterized in that possible. The student chair according to claim 10 or 13, further comprising a support block at four corners of the lower end of the leg frame.