Posture holding device

Abstract

To support a seated person so that his / her posture can become proper.SOLUTION: A postural maintenance tool comprises: a first support part (23) that assumes a concave spherically-curved surface shape capable of supporting the buttocks (42) in a seated state; a front protrusion (24) that protrudes forward from a lower end of the first support part (23) and that can support the downside of a thigh (43); and an upper protrusion (25) that is positioned on the upside of the first support part (23) and that comprises a lumbar part support part (28) assuming a convexly curved shape capable of supporting the iliac part (151) of the lumbar part (44). First scooped-out parts (30) are provided on both the sides of a root part of the upper protrusion (25), respectively.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] This invention is, for example, used by being placed on the seat part of a chair be .

Background Art

[0002] Conventionally, as this type of posture maintaining device, for example, a configuration disclosed in Patent Document 1 has been proposed. In this conventional configuration, the entire posture maintaining device is integrally formed of a thick cushioning material such as foamed polyurethane. This posture maintaining device is provided with a seat part that bears most of the weight of the seated person.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] child The invention has been made by paying attention to the problems existing in such conventional technologies 。

Means for Solving the Problems

[0005] To achieve the above object, this posture maintaining device includes a hip support part capable of supporting the buttocks of the seated person and an upper protruding part located above the hip support part, and the upper protruding part It is equipped with a pair of lumbar support parts that can support both sides of the seated person's waist from the rear, a front projection is provided in front of the buttock support parts, and the front center of the front projection has a portion that is recessed to the rear and shortens in the front-to-back direction.

[0006] Furthermore, the seat includes a buttock support portion capable of supporting the seated person's buttocks and an upper projection portion located above the buttock support portion. The upper projection portion includes a pair of lumbar support portions capable of supporting both sides of the seated person's waist from the rear, and between the pair of lumbar support portions is a portion that is recessed downwards and shortens in length in the front-to-back direction. Furthermore, the posture support device includes a buttock support portion capable of supporting the seated person's buttocks and an upper projection located above the buttock support portion. The upper projection portion includes a pair of lumbar support portions capable of supporting both sides of the seated person's waist from the rear, and multiple holes are formed throughout the body of the posture support device.

Effects of the Invention

[0007] According to the above posture maintaining device, It comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper protrusion located above the buttock support portion.

Brief Description of the Drawings

[0008] [Figure 1] Perspective view showing the posture maintaining device of the first embodiment. [Figure 2] Front view of the posture maintaining device of FIG. 1. [Figure 3] Plan view of the posture maintaining device of FIG. 1. [Figure 4] Side cross-section at the position of the 4-4 line of FIG. 2 showing the usage state in conjunction with the human skeleton. [Figure 5] Front cross-sectional view at the position of the hip support portion showing the usage state. [Figure 6] Front cross-sectional view at the position of the thigh support portion showing the usage state. [Figure 7] Cross-sectional view of the 7-7 line of FIG. 2. [Figure 8] Cross-sectional view of the 8-8 line of FIG. 2. [Figure 9] View seen obliquely from the rear showing the usage state. [Figure 10] Front view of the main body. [Figure 11] Cross-sectional view showing the laminated structure of the posture maintaining device. [Figure 12] Cross-sectional view at the 12-12 line of FIG. 10. [Figure 13] Front view of the main body of the second embodiment. [Figure 14] Perspective view showing the posture maintaining device of the third embodiment. [Figure 15] Rear-side perspective view of the posture maintaining device of FIG. 14. [Figure 16] Exploded perspective view of the posture maintaining device of FIG. 14. [Figure 17] Front view of the posture maintaining device of FIG. 14. [Figure 18] Enlarged cross-sectional view at the 18-18 line of FIG. 17.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, the posture maintaining device of the embodiment will be described with reference to the drawings. (First Embodiment) First, the first embodiment will be described based on FIGS. 1 to 12.

[0010] As shown in FIGS. 1 to 3, the posture maintaining device 21 of this embodiment is formed in a substantially petal shape as a whole. The posture maintaining device 21 includes a main body 22 (see FIGS. 4 and 5) made of a hard synthetic resin plate such as polypropylene. Here, the hard synthetic resin is a foamed material or a non-foamed solid material, which has a hardness that can stand on its own without deforming under its own weight, and for example, has a hardness value of R50 to 110 in Rockwell hardness.

[0011] As shown in FIGS. 4 and 5, a concave curved hip support portion 23 for supporting the buttocks 42 of the seated person 41 is formed at the central portion in the front-rear direction of the posture maintaining device 21. A front protrusion 24 is formed at the lower front side, which is one end side of the posture maintaining device 21, facing forward. An upper protrusion 25 is formed at the upper rear side, which is the other end side of the posture maintaining device 21, facing upward. As shown in FIGS. 1 and 2, a pair of first pinching portions 30 are formed on both left and right sides of the base of the upper protrusion 25 to enable appropriate bending of the upper protrusion 25 in the rearward tilting direction.

[0012] As shown in FIGS. 4 and 5, the upper surface of the hip support portion 23 is formed in a curved surface shape in the front-rear direction and the left-right direction so as to stably support the buttocks 42 of the seated person 41 from the front-rear direction and the left-right direction, and is formed in a concave shape of a substantially spherical curved surface as a whole. The lower surface of the hip support portion 23 is also formed in a spherical curved surface shape. And the lower surfaces of the hip support portion 23 and the front protrusion 24 are formed in a continuous spherical curved surface shape. As shown in FIGS. 1 and 3, a second pinching portion 26 is formed on the front side of the central portion of the front protrusion 24. As shown in FIG. 6, on both left and right sides of the front protrusion 24, that is, on both sides of the second pinching portion 26, a pair of left and right thigh support portions 27 having a concave curved shape when viewed from the front are formed so as to support the lower limbs 45 of the seated person 41 in a substantially parallel state. These thigh support portions 27 support the thighs 43 so as to wrap them from below. Also, since the thigh support portions 27 are in a concave curved shape, it restricts the thighs 43 from opening to the left and right.

[0013] As shown in Figures 2, 7, and 8, the upper projection 25 has a pair of left and right lumbar support portions 28, the upper portion 281 having a convex curved shape and the lower portion 282 having a concave curved shape. Each lumbar support portion 28 has a convex curved upper portion 281 that bulges out diagonally forward so as to point inward and forward. As a result, as shown in Figures 4 and 5, both sides of the pelvic portion 151 of the lumbar region 44 of the seated person 41 can be pushed from the rear towards inward and forward, avoiding the spine 152. A third recessed portion 29 is formed between the pair of lumbar support portions 28.

[0014] As shown in Figure 12, the thickness t1 of the edge 301 of the main body 22 at the back of the first recess 30 is formed to be thicker than the thickness t2 of other parts of the main body 22. That is, when the waist support 28 flexes, concentrated stress acts on the edge 301 at the back of the first recess 30 of the main body 22. This stress may cause cracks to occur in the edge 301 and its vicinity. In this case, these cracks are suppressed by the increase in thickness t1.

[0015] As shown in Figures 2 and 7, a pair of legs 31 are provided protruding from both sides of the lower surface of the buttock support portion 23 of the posture support device 21. When the posture support device 21 is placed on a surface such as the seat of a chair 100, the posture support device 21 is supported stably on the surface via these legs 31, with minimal slippage. In particular, these legs 31 restrict the lateral movement of the posture support device 21, making it difficult for the upper body of the seated person 41 to tilt from side to side.

[0016] As shown in Figure 11, a cushioning material 32 made of open-cell foamed polyurethane or the like is attached to the seating side of the main body 22. The entire posture support device 21, including the main body 22 and the cushioning material 32, is covered with an outer sheet 34. This outer sheet 34 consists of an outer surface sheet 341 made of woven or knitted fabric and a backing sheet 342 made of an elastic material such as open-cell EVA (ethylene vinyl acetate copolymer resin) laminated to the back surface of the surface sheet 341.

[0017] As shown in Figure 10, multiple first holes 33 are provided at intervals between each other in the lower part of the upper protrusion 25 of the main body 22. In this way, moisture from perspiration can escape through the first holes 33. Also, when the cushioning material 32 is molded, a portion of the cushioning material 32 enters into the first holes 33, as shown in Figure 11. The entry of a portion of the cushioning material 32 into the first holes 33 prevents the cushioning material 32 from peeling off the surface of the main body 22 and prevents the cushioning material 32 from moving on that surface.

[0018] Multiple small second holes 221 are formed throughout the main body 22. These second holes 221, along with the first holes 33, are for releasing moisture caused by perspiration from the seated person. A portion of the cushioning material 32 enters these second holes 221 during the molding process.

[0019] Next, the operation of the posture-holding device 21 configured as described above will be explained. For example, when using the posture support device 21 in an office setting while sitting in a chair and performing desk work, the posture support device 21 is placed on the seat of the chair. In this state, as shown in Figures 4 to 6 and Figure 9, when a person 41 sits on the posture support device 21, the lower surface of the part spanning from the buttock support portion 23 to the front projection portion 24 is formed in a spherical curved shape. As a result, the posture support device 21 tilts slightly forward due to the weight of the person 41, and in this state, the buttocks 42 of the person 41 are supported on the spherical concave buttock support portion 23. At this time, the tilt of the buttock support portion 23 in the left and right direction is restricted by the left and right legs 31, so the buttock support portion 23 is relatively stable in the left and right direction.

[0020] In this way, as the posture support device 21 tilts slightly forward, the buttocks 42 of the seated person 41 also tilt slightly forward, causing the seated person 41's pelvis 151 to be in an upright position, and in this position, the seated person 41's buttocks 42 are supported on the buttock support part 23. Furthermore, as the pelvis 151 is upright, the spine naturally straightens, so even if the posture support device 21 tilts forward, the seated person's upper body does not tilt forward. In addition, both of the seated person 41's thighs 43 are supported in a nearly parallel position by the concave curved thigh support part 27 on the anterior protrusion 24. Therefore, the seated person's lower limbs 45 are supported in an aligned position.

[0021] Furthermore, as the posture support device 21 tilts forward, the pair of lumbar support parts 28 of the upper projection 25 also move forward, so that the pelvic portion 151, including the ilium, of the sitter's lumbar region 44 is supported by being enveloped from both sides, as shown in Figures 3 and 4. At this time, as shown in Figure 8, both sides of the lumbar region 44 are pushed and supported from the rear toward the inward and forward direction by the convex curved upper parts 281 of the pair of lumbar support parts 28 of the upper projection 25. As a result, the sitter's spine is naturally and effortlessly straightened, and their posture is supported in a correct state while providing a good sitting comfort. Therefore, the sitter 41 can maintain a correct posture for a long time with almost no fatigue.

[0022] In this case, a pair of first indentations 30 are formed on both sides of the base of the upper projection 25 of the posture support 21. Therefore, when a seated person 41 leans backward while seated, the upper projection 25 is appropriately bent backward in the portion narrowed by the first indentations 30, allowing the seated person 41 to move. Furthermore, if the seated person 41 is overweight or has a large build, the first indentations 30 alleviate any discomfort caused by their build, ensuring a comfortable seating experience. In other words, the first indentations 30 open up both sides of the base of the upper projection 25, that is, both sides between the buttock support 23 and the upper projection 25, thus reducing the seated person's feeling of confinement.

[0023] Furthermore, this posture-holding device 21 can be used not only on the seat of a chair, but also placed on the floor. In other words, because the main body 22 is made of a rigid material, it can be used as a seat chair that can maintain posture.

[0024] The posture support device 21 can also be configured without, for example, the front projection 24. In this case, for example, the position shown by the dashed line 101 in Figure 3 becomes the front end of the posture support device 21. When configured in this way, for example, when used as a chair on the floor, the lower limbs 45 are no longer restricted by the thigh support 27, so the degree of freedom of the lower limbs 45 of the sitter 41 increases, making it easier to sit in any posture, such as cross-legged. However, since the support of the lower limbs 45 by the thigh support 27 is gone, the effect of keeping the thighs 43 horizontal is slightly reduced, but this is hardly a problem as it is on the floor. Furthermore, the buttock support 23, which forms the legs 31 in the left-right direction, makes it possible to keep the buttocks 42 almost horizontal. Therefore, even if the thigh support portion 27 is not provided, the buttocks 42 are stably and naturally supported in the front-to-back and left-to-right directions by the buttock support portion 23, and both sides of the waist 44 are pushed and supported from the rear toward the inward front by the convex curved upper portion 281 of the waist support portion 28, so that the upper body of the seated person 41 can be supported in the correct posture.

[0025] According to the above-described embodiment, the following effects can be obtained. (1) According to the above embodiment, the buttock support portion 23 that supports the buttocks 42 of the seated person 41 is formed in a concave curved shape in the front-rear and left-right directions. Therefore, the buttock support portion 23 can not only stably and naturally support the buttocks 42 in the front-rear and left-right directions without strain, but the area supporting the buttocks 42 is also widened, and body pressure is distributed. As a result, the seated person 41 can maintain a seated position without feeling much fatigue or discomfort.

[0026] (2) The two thigh support parts 27 on the left and right sides of the anterior protrusion 24, which have a concave curved shape, provide stable support to both thighs 43 of the seated person 41 from below over a wide area, allowing the lower limbs 45 to be naturally aligned. Furthermore, because the thigh support parts 27 have a concave curved shape, they restrict the thighs 43 from spreading apart. As a result, as described above, body pressure is distributed, allowing the seated person to maintain a seated position without feeling fatigue, and the seated person 41's pelvis 151 does not tilt, allowing the pelvis 151 to be kept horizontal. Therefore, as shown in Figure 5, the spine 152 can be naturally upright in the left-right direction.

[0027] (3) The main body 22 of the posture support device 21 is made of a rigid plate material. Therefore, unlike conventional configurations in which the entire posture support device 21 is made of a thick elastic material such as cushioning material, the thighs 43 and waist 44 can be firmly supported at the waist support portion 28 without causing the large elastic deformation that occurs with the thick elastic material, thereby enhancing the posture-holding effect. If the seated person 41 loses their posture, the posture support device 21 hardly deforms, so the seated person 41 can immediately return to the correct posture. Furthermore, by maintaining the correct posture, the muscles that maintain posture are used and strengthened, and as a result, the correct posture can be naturally maintained even when the posture support device 21 is not used. In addition, in the conventional configuration in which the entire posture support device is made of cushioning material, when the posture support device is placed on a chair, the seat becomes high due to its thickness, making it difficult to use. In contrast, in this embodiment, since the main body 22 is made of hard resin, unlike the conventional configuration, the thickness of the posture support 21 can be made thinner, and there are virtually no problems when using the posture support 21 placed on the chair 100.

[0028] (4) Because the lower surface from the buttock support portion 23 to the anterior projection portion 24 has a spherical curved surface shape with a large radius of curvature in the anterior-posterior direction, the posture support device 21 tilts forward when the seated person 41 is seated. Consequently, the seated person 41's pelvis 151 is supported in an upright position, and the seated person 41 assumes a posture with a naturally straight spine. In this position, the seated person 41 is supported by the lumbar support portion 28 of the upper projection portion 25, so that the portion of the pelvis 151 including the ilium is pushed from the left and right sides diagonally backward toward the front, and the lumbar region 44 is supported in a way that it is enveloped.

[0029] Therefore, the lumbar region of the seated person 41 is also pushed forward, and as shown in Figures 4 and 5, the seated person 41, combined with the stable support of the buttocks 42 and both thighs 43, naturally stands up in an ideal S-curve shape, ensuring that the upper body, i.e., the spine 152, does not tilt to the left or right, resulting in a correct posture. Moreover, the legs 31 provide lateral stability to the posture support device 21, suppressing tilting of the upper body and further enabling a correct posture. Consequently, even if the seated person 41 has a lateral distortion in the spine 152, or is slightly hunched over, the body is supported in the correct position, and the seated person 41's upper body naturally extends in a proper, neutral posture.

[0030] Therefore, the burden on the lower back of the person sitting 41 is reduced, allowing the person sitting 41 to relax, straighten their spine, and maintain a correct posture without strain. Even when sitting for long periods, the burden on the lower back 44 and lower limbs 45 is reduced, resulting in less fatigue. Incidentally, it is also possible to straighten the spine of the person sitting 41 by directly pushing the spine 152 or lumbar vertebrae forward without using the posture support device 21, but in such cases, the person sitting 41 will feel pain and discomfort, making it difficult to maintain sitting for long periods. Furthermore, even if the person sitting 41 has a lordosis (excessive curvature of the lower back 44), supporting the lower back 44 with the lumbar support device 28 allows the pelvis 151 and spine 152 to be supported in a way that envelops them, thus reducing the burden on the lower back 44 and allowing for relaxation.

[0031] (5) Since the lower surfaces of the buttock support portion 23 and the front projection portion 24 are formed in a spherical curved shape with a large radius of curvature in the left-right direction, a certain degree of tilting of the posture holder 21 in the left-right direction is permitted. Therefore, the seated person 41 can tilt their upper body slightly from side to side and avoid feeling cramped.

[0032] (6) Legs 31 are provided protruding from both sides of the lower surface of the buttock support portion 23 of the posture support device 21. This prevents the posture support device 21 from sliding or tilting excessively to the left or right when placed on, for example, the seat of a chair 100, and allows it to be placed in a stable state.

[0033] (7) First indentations 30 are formed on both sides of the base of the upper projection 25. Therefore, even if the main body 22 of the posture support device 21 is made of a hard synthetic resin, when the sitter 41 sits on the buttock support 23 and leans back, applying a load to the upper projection 25 in a backward direction, the upper projection 25 can be bent. This contributes to maintaining the correct posture of the sitter 41 and reducing fatigue. In other words, because the main body 22 of the posture support device 21 is made of a hard synthetic resin, the posture support device 21 has rigidity and hardness, and although the change in shape is small, deformation of the required parts can be ensured. Therefore, the posture support device 21 can effectively perform its original function and contribute to maintaining a relaxed posture without strain.

[0034] (8) In addition, since the buttock support portion 23 is formed in a concave spherical curved shape, the base of the upper projection portion 25 that extends upward from the buttock support portion 23 is also formed in a concave spherical curved shape similar to that of the buttock support portion 23. Therefore, unlike this embodiment, if the first indentation portion 30 is not formed, the upper projection portion 25 will be rigid and difficult to bend backward. However, in this embodiment, as described above, the first indentation portion 30 is formed on both sides of the base of the upper projection portion 25, so the difficulty in bending is eliminated, and the upper projection portion 25 can appropriately respond to the body movements of the seated person 41.

[0035] (9) First indentations 30 are formed on both sides of the base of the upper protrusion 25, and since this part is open, it is possible to prevent the seated person 41 from feeling cramped. In contrast, if the indentations 30 are not formed, if the seated person 41 is large in build, their buttocks may come into contact with this part, and in such cases they will feel cramped.

[0036] (10) The formation of the first to third recessed parts 30, 26, and 29 makes it possible to reduce the overall weight of the posture support device 21. (11) As described above, a third recess 29 is formed between the lumbar support portions 28. Therefore, when the seated person 41 leans backward or leans back significantly, the spine of the seated person 41 will not come into contact with the upper protrusion 25. Thus, discomfort in such cases can be avoided.

[0037] (12) Four notches are formed by the first notch 30, the second notch 26, and the third notch 29. As a result, the entire posture support device 21 takes on a petal shape, making it aesthetically pleasing.

[0038] (13) The edge 301 of the first recess 30 is formed to be thicker than the other parts. Therefore, even if a large stress is applied to the first recess 30 due to deformation caused by the tilting of the upper protrusion 25, the risk of damage to the edge 301 of the first recess 30 can be suppressed.

[0039] (14) A cushioning material 32 is provided on the seating side surface of the main body 22. Therefore, the elastic and cushioning effects of the cushioning material 32 make it possible to maintain a good seating comfort. (15) The entire structure is covered by an outer sheet 34. This allows the overall appearance of the posture support device 21 to be kept aesthetically pleasing.

[0040] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Figure 13. In this second embodiment and subsequent embodiments and modifications, the focus will be on the differences from the first embodiment.

[0041] In the second embodiment, as shown in Figure 13, the first hole 33 and the second hole 221 of the main body 22, as in the first embodiment, are not provided. Therefore, in the second embodiment, the molding of the main body 22 becomes easier.

[0042] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Figures 14 to 18. In this embodiment, the degree of recessing of the second recess 26 and the third recess 29 is shallower compared to the first embodiment.

[0043] Furthermore, a single layer of EVA outer sheet 51 is bonded to the seating surface side of the main body 22, which is made of a rigid material such as polypropylene, using an elastomer-based adhesive. As shown in Figures 16 and 18, a fold 511 is formed on the periphery of the outer sheet 51, and the outer sheet 51 is bonded to the seating surface of the main body 22 with this fold 511 fitted onto the periphery of the main body 22. The back and bottom surfaces of the main body 22 are exposed. The outer sheet 51 is made of a porous material that is flexible, elastic, and breathable.

[0044] Multiple holes 52 are formed in the upper protruding portion 25. As shown in Figure 18, each hole 52 is composed of a hole 521 in the main body 22 and a hole 522 in the outer sheet 51, with the hole 521 in the outer sheet 51 being larger than the hole 521 in the main body 22. As a result, the inner edge of the hole 522 in the outer sheet 51 protrudes towards the center of the hole from the inner edge of the hole 521 in the main body 22, so that the inner edge of the hole 521 in the main body 22 does not come into contact with the seated person 41.

[0045] As shown in Figure 15, multiple anti-slip surfaces 53 made of a material with a high coefficient of friction are attached to the bottom surface of the front projection 25 and the lower end of the legs 31. The third embodiment has the following effects:

[0046] (16) Since the posture support device 21 is constructed by covering the seating surface side of the main body 22 with a single layer outer sheet 51, the number of parts is small and the construction is simple. Also, since the back and bottom surfaces of the main body 22 are exposed, the outer sheet 51 can be small, and it is easy to cover the main body 22 with the outer sheet 51. Therefore, the posture support device 21 can be manufactured at low cost.

[0047] (Example of change) Furthermore, this embodiment can also be modified and implemented as follows. - The buttock support portion 23 of the posture support device 21 may be made into a shape other than a spherical curved surface, such as a flat surface, a cylindrical concave shape, or a concave curved shape. In this case, the effect of the buttock support portion 23 in stably supporting the buttocks 42 from the front-back and left-right directions will be reduced. However, in the left-right direction, the thighs 43 will be restricted by the concave curved thigh support portion 27, and as a result, the buttocks 42 will also be stabilized. Therefore, the seated person 41 will maintain a horizontal pelvis 151, and both sides of the waist 44 will be supported by the waist support portion 28, which will push from the rear toward the inward front. As described above, even if the buttock support portion 23 of the posture support device 21 is formed into a shape other than a spherical curved surface, it is still possible to support the seated person 41 in a correct posture.

[0048] • The cushioning material 32 is provided on both the seating side and the opposite side of the main body 22. • Omit the cushioning material 32. • Omit the exterior seat 34.

[0049] - Both the cushioning material 32 and the outer sheet 34 are omitted. In other words, the posture support device 21 consists only of the main body 22. - The legs 31 on the underside of the posture support device 21 are omitted, and the underside is made flat.

[0050] The first notch 30 at the base of the lumbar support portion 28 is provided on only one side, left or right. - Ensure that no indentations other than the first indentation 30 are formed. If the third indentation 29 is not formed, the pair of lumbar support parts 28 appear as one continuous unit, but because the lumbar support parts 28 protrude forward, the central continuous part does not come into contact with the spine 152 or its sides, and can instead support both sides of the lumbar region 44, thus effectively creating a pair.

[0051] The buttock support portion 23 is formed in a straight line in either the front-to-back direction or the left-to-right direction. The main body 22 shall be constructed of FRP (glass fiber reinforced resin), which is resin reinforced with glass fibers. The technical concept is described below. (0001) This invention relates to a posture-holding device that can be used, for example, by being placed on the seat of a chair, and is capable of maintaining the correct posture of the person sitting. (0002) Conventionally, a posture support device of this type has been proposed, for example, the configuration disclosed in Patent Document 1. In this conventional configuration, the entire posture support device is integrally molded from a thick cushioning material such as foamed polyurethane. This posture support device is equipped with a seat that bears the majority of the weight of the person sitting on it. (0004) In this conventional configuration, it is difficult to provide stable support for the seated person. As a result, the seated person has difficulty maintaining a correct posture. This invention was made in response to the problems present in such conventional technologies. Its purpose is to maintain the correct posture of the seated person. (0005) To achieve the above objective, this posture support device comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper projection portion located above the buttock support portion. The width of the upper projection portion is wider above the base portion where it attaches to the buttock support portion, and the left and right sides of the upper projection portion are located forward of the central part in the left-right direction. (0006) This configuration allows for maintaining the correct posture of the seated person. (0007) The aforementioned posture-holding device can maintain the correct posture of the person sitting. Furthermore, the technical concept is described below. (Technical thought 1) It comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper protrusion located above the buttock support portion, The aforementioned upper projection includes a pair of lumbar support parts capable of supporting both sides of the seated person's waist from the rear. A posture support device comprising a front projection in front of the buttock support portion, and a portion recessed at the front center of the front projection, which shortens the length in the front-to-back direction. (Technical thought 2) It comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper protrusion located above the buttock support portion, The aforementioned upper projection includes a pair of lumbar support parts capable of supporting both sides of the seated person's waist from the rear. A posture support device having a portion between the pair of lumbar support portions that is recessed downwards, thereby shortening its length in the vertical direction. (Technical Thought 3) It comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper protrusion located above the buttock support portion, The aforementioned upper projection includes a pair of lumbar support parts capable of supporting both sides of the seated person's waist from the rear. A posture support device in which multiple holes are formed throughout the entire body of the posture support device. (Technical Thought 4) A posture-holding device according to any one of Technical Ideas 1 to 3, wherein the buttock support portion and the upper protrusion portion are integrally formed by including a rigid plate material. (Technical Thought 5) The main body is made of a hard plate material, The buttock support portion has a cushioning material attached to the main body of the posture support device, and the entire posture support device, including the main body and the cushioning material, is covered with an outer sheet. The posture-holding device according to technical concept 3, wherein the exterior sheet is composed of a surface sheet and a back sheet made of an elastic material laminated to the back surface of the surface sheet. (Technical Thought 6) The posture support device according to any one of Technical Ideas 1 to 5, wherein the upper protrusion has a width at the base where it attaches to the buttock support, which is narrower than the width above the base, and the thickness at the base is thicker than the thickness of other parts. (Technical Thought 7) A posture-holding device according to technical concept 2 or technical concept 3, comprising a front projection in front of the buttock support portion, and a portion recessed posteriorly on the central front side of the front projection portion, which shortens the length in the front-to-back direction. (Technical Thought 8) A posture support device according to technical concept 1 or technical concept 3, wherein a portion is provided between the pair of lumbar support portions, which is recessed downwards and has a shorter vertical length. (Technical Thought 9) A posture support device according to technical concept 1 or technical concept 2, wherein multiple holes are formed throughout the body of the posture support device. [Explanation of symbols]

[0052] 21...Posture support device, 22...Main body, 23...Buttock support part, 24...Front protrusion, 25...Upper protrusion, 26...Second indentation, 27...Thigh support part, 28...Waist support part, 29...Third indentation, 30...First indentation, 301...Edge, 31...Legs, 32...Cushioning material, 34...Outer sheet, 41...Seated person, 42...Buttocks, 43...Thighs, 44...Waist, 45...Lower limbs, 52...Spine, t1...Thickness of edge, t2...Thickness of other parts.

Claims

1. It comprises a buttock support portion capable of supporting the buttocks of a seated person and an upper protrusion located above the buttock support portion, The aforementioned upper protrusion is provided with a pair of lumbar support parts capable of supporting both sides of the seated person's waist from the rear, and the width of the base where it attaches to the buttock support part is narrower than the upper part of the base, and the thickness of the base is formed to be thicker than the thickness of other parts. A posture support device comprising a front projection in front of the buttock support portion, and a portion recessed at the front center of the front projection, which shortens the length in the front-to-back direction.

2. The posture support device according to claim 1, wherein the buttock support portion and the upper protruding portion are integrally formed by including a rigid plate material.

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