Seat support device

Abstract

To provide a sitting position assist device that allows a person to sit comfortably and provides a sitting position environment that reduces fatigue. [Solution] The seat body 10 includes an ischial tuberosity accommodation portion 11 consisting of a recess or through hole that accommodates the ischial tuberosities, and a support portion arranged around the ischial tuberosity accommodation portion 11, the support portion including a sacrum support portion 25 arranged in the rear center of the ischial tuberosity accommodation portion 11, a pair of left and right buttock support portions 27 arranged on either side of the sacrum support portion 25, a pair of left and right greater trochanter support portions 21 arranged on both sides of the ischial tuberosity accommodation portion 11, and a pair of left and right lesser trochanter support portions 23 arranged in front of the ischial tuberosity accommodation portion 11, and has an inclined surface that rises outward from the ischial tuberosity accommodation portion 11 as a starting point, and the ischial tuberosity accommodation portion 11 is at the lowest position on the seat body 10.

Description

[Technical Field]

[0001] The present invention relates to a sitting position assist device that is placed on the seat of a chair, wheelchair, or the like. [Background technology]

[0002] Sitting for long periods of time can cause pain in the buttocks and even lower back pain. To solve these problems, seating cushions or seats have been developed that can be placed on the seat of a chair to allow comfortable sitting or to maintain a seated posture (see, for example, Patent Documents 1, 2, and 3).

[0003] Patent Document 1 discloses a seat that has a convex portion on the rear of the upper surface of the platform on which the user's buttocks rest, allowing the user to maintain an appropriate sitting posture. Patent Document 2 discloses a cushioning material with an innovative shape that prevents the user from losing their sitting posture by layering a buffer material with stress relaxation properties on a support member with shape retention. Patent Document 3 discloses a seating cushion that guides the user to a correct sitting posture and provides a comfortable sitting experience. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-186053 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-406 [Patent Document 3] Patent Publication No. 2021-23544 Summary of the Invention [Problem to be solved by the invention]

[0005] In addition to Patent Documents 1 to 3, seating surfaces and seating cushions have been developed with the aim of providing comfortable seating or maintaining a good seated posture, but they are not sufficient and there is still room for improvement.

[0006] An object of the present invention is to provide a sitting assistance device that provides a sitting environment that allows a person to sit comfortably and reduces fatigue. [Means for solving the problem]

[0007] The present invention provides a seat body including an ischial tuberosity receiving portion formed as a recess or through hole for receiving the ischial tuberosities, and a support portion provided around the ischial tuberosity receiving portion and having an inclined surface that increases in height outward from the ischial tuberosity receiving portion, wherein the seat body has a seat surface that receives and supports the buttocks and thighs by setting an angle on the surface that contacts the buttocks and thighs, and the ischial tuberosity receiving portion of the seat is at its lowest position, and the inclination angle of the surface that contacts the body is close to vertical in areas with little muscle mass, centered on the ischial tuberosity, and close to horizontal in areas with much muscle mass. the law of nature, The support portion has at least a sacrum support portion disposed at the rear center of the ischial tuberosity accommodation portion, and a pair of left and right buttock support portions disposed adjacent to the sacrum support portion, and the ischial tuberosity accommodation portion has The rear central portion connected to the sacral support portion is curved so as to widen backward, This is a sitting position assist device characterized in that the rear central portion connected to the sacrum support portion and the portion connected to the buttocks support portion are curved in opposite directions.

[0008] In the sitting position assist device according to the present invention, the ischial tuberosity receiving portion has a flat shape that is long in the left-right direction in a plan view. In the sitting position assist device according to the present invention, the ischial tuberosity accommodation portion is characterized in that the ratio of the length in the front-to-rear direction to the width in the left-to-right direction is width / length≈3 in plan view.

[0009] In the seating assistance device according to the present invention, the support part comprises: Further ahead The seat cushion includes a pair of greater trochanter support portions located on both sides of the ischial tuberosity accommodating portion, and a pair of lesser trochanter support portions located in front of the ischial tuberosity accommodating portion, and the inclination angles of the sacrum support portions, buttock support portions, greater trochanter support portions, and lesser trochanter support portions relative to the bottom surface of the seat body are all different. Furthermore, the sitting position assist device according to the present invention has a perineal ridge that is positioned in front of the ischial tuberosity accommodation part, connected to the lesser trochanter support part, and is formed higher than the lesser trochanter support part, and the sacrum support part and the buttocks support part support the back of the pelvis from the back towards the center, forming three-point fixation together with the support of the perineal ridge and preventing backward tilt.

[0010] The seating assistance device according to the present invention further comprises a cover that covers the seat body, and the cover covers the seat body so that a space is formed between the cover itself and the ischial tuberosity accommodation portion and the support portion, and when the user sits down, the cover sinks and tension is generated in the cover, which acts to prevent deformation of the seat body. [Effects of the Invention]

[0011] According to the present invention, a sitting position assist device can be provided that provides a sitting environment that allows a person to sit comfortably and reduces fatigue. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an external view of a seating position assistance device 1 according to a first embodiment of the present invention, viewed obliquely from the front. [Figure 2] 1 is an external view of a seat main body 10 of a sitting position assistance device 1 according to a first embodiment of the present invention, viewed obliquely from the front. [Figure 3] 1 is a plan view of a seat body 10 of a seating position assistance device 1 according to a first embodiment of the present invention. [Figure 4] 3 is a diagram showing the inclination angle of the support part of the seat main body 10 of the sitting position assistance device 1 of the first embodiment of the present invention. FIG. [Figure 5] 1 is a plan view showing the arrangement of each part of a seat main body 10 of a sitting position assistance device 1 according to a first embodiment of the present invention. [Figure 6] 1A and 1B are diagrams for explaining the functions and actions of the sitting position assistance device 1 of the first embodiment of the present invention. [Figure 7] FIG. 10 is an external view of a seating position assistance device 2 according to a second embodiment of the present invention, seen obliquely from the front. DETAILED DESCRIPTION OF THE INVENTION

[0013] FIG. 1 is an external view of a seating support device 1 according to a first embodiment of the present invention, as seen obliquely from the front. FIG. 2 is an external view of the seat main body 10 of the seating support device 1 as seen obliquely from the front. FIG. 3 is a plan view of the seat main body 10 of the seating support device 1, with the thin lines in the figure representing contour lines. FIG. 4 is a diagram showing the inclination angle of the support section of the seat main body 10 of the seating support device 1, with (A), (B), (C), and (D) being end views cut along the center line M, the cutting lines AA, BB, and CC, respectively. FIG. 5 is a plan view showing the layout of each part of the seat main body 10 of the seating support device 1, with the two-dot chain lines in the figure indicating the approximate boundaries of each part. FIG. 6 is a diagram for explaining the function and operation of the seating support device 1.

[0014] In the description of the sitting position assistance device 1 and seat main body 10 of the first embodiment of the present invention, the front-to-back direction is referred to as length, the left-to-right direction as width, and the up-to-down direction as height. In the description of the sitting position assistance device 1 and seat main body 10, "outside" refers to the direction away from the ischial tuberosity accommodation portion 11, that is, the outer periphery. In the following description, the bottom surfaces of the sitting position assistance device 1 and seat main body 10 are assumed to be placed on a horizontal plane.

[0015] In the following description, typical dimensions and tilt angles of the support parts of the seating position assistance device 1 of the first embodiment are shown, but the seating position assistance device according to the present invention is not limited to these values. The values ​​shown in Figure 4 are typical tilt angles of each support part relative to the bottom surface.

[0016] The sitting position assist device 1 helps maintain posture by guiding the human body to a desirable position, thereby reducing fatigue. Specifically, the sitting position assist device 1 concentrates force on the left and right ischial tuberosities, where weight is concentrated, thereby assisting muscle activity and relieving the load on the ischial tuberosities. The configuration of the sitting position assist device 1 is described in detail below.

[0017] The sitting position assist device 1 is composed of a seat main body 10 and a cover 50, and controls the direction of all forces at the front-long and rear-short positions with the ischial tuberosity as the center in the front-to-back direction, with the aim of distributing the load evenly on all surfaces. The shape of the seat main body of the sitting position assist device 1 also controls the load vectors in 16 directions applied to the buttocks and thighs in preferred directions (see Figure 6).

[0018] The external dimensions of the seating position assist device 1 and the seat main body 10 for adults are typically a length L of 45 cm, a width W of 45 cm, and a height H of 7 to 9 cm as shown in FIGS.

[0019] The seat body 10 has a seat surface that is angled to accommodate and support the buttocks and thighs. The seat surface is lowest at the part that accommodates the ischial tuberosities, where the weight is generally placed, and the inclination angle of the surface that comes into contact with the body is close to vertical in areas with little muscle mass, centered around the ischial tuberosities, and close to horizontal in areas with a lot of muscle mass (see Figure 4).

[0020] The seat surface is composed of an ischial tuberosity receiving portion 11, and a plurality of support portions and a plurality of ridge portions arranged around the ischial tuberosity receiving portion 11, and is provided symmetrically with respect to the center line M.

[0021] The ischial tuberosity accommodation portion 11 is the portion that accommodates the ischial tuberosity and lesser trochanter of the femur, and is the lowest portion of the seat, located rearward of the center when looking at the seat main body 10 in the front-to-back direction. In this embodiment, the ischial tuberosity accommodation portion 11 is a through-hole that passes through the seat main body 10 in the up-down direction, but it may also be a recess instead of a through-hole.

[0022] The ischial tuberosity accommodation portion 11 has a generally flat shape that is long in the left-right direction when viewed from above. In the case of a seat main body 10 with external dimensions of length L 45 cm, width W 45 cm, and height H 7-9 cm, the ischial tuberosity accommodation portion 11 is approximately 30 cm wide in the left-right direction and approximately 10 cm long in the front-to-back direction, with a width / length ratio of approximately 3. Furthermore, a detailed observation of the shape of the ischial tuberosity accommodation portion 11 in plan view reveals that the shape varies depending on the location, with a series of curved portions of different radii formed.

[0023] The ischial tuberosity accommodation portion 11 is curved so that the front central portion connected to the perineal ridge 31 protrudes backward, and the portions connected to the lesser trochanter support portions 23 on either side of the perineal ridge 31 are curved in the opposite direction to the perineal ridge 31. Both side portions connected to the greater trochanter support portion 21 are curved so that they widen outward. In addition, the rear central portion connected to the sacral support portion 25 is curved so that they widen backward, and the buttock support portions 27 on either side of the sacral support portion 25 are curved in the opposite direction to the sacral support portion 25. In addition, each support portion connected to the ischial tuberosity accommodation portion 11 and the perineal ridge 31 are curved in the same way as the ischial tuberosity accommodation portion 11 at the connected points in a plan view.

[0024] The support parts that make up the seat have a shape that supports the cross section of the human body pressed by gravity symmetrically on both sides, and include a greater trochanter support part 21, a lesser trochanter support part 23, a sacrum support part 25, a buttocks support part 27, and a thigh support part 29.

[0025] The greater trochanter support portions 21 are portions that mainly support the outer protrusion (greater trochanter) of the femur, which is the thighbone that constitutes the hip joint, and are disposed on both sides of the ischial tuberosity accommodation portion 11. The greater trochanter support portions 21 are connected to the ischial tuberosity accommodation portion 11 and have an inclined surface that becomes higher the further away from the ischial tuberosity accommodation portion 11. This inclined surface is not a smoothly curved surface, but is composed of a series of inclined surfaces with different inclination angles (see FIG. 4(C)).

[0026] The lesser trochanter support parts 23 are located between the ischial tuberosity and the greater trochanter of the femur and are parts that mainly support the lesser trochanter of the femur, which has a certain degree of protrusion when sitting, and are arranged on the left and right sides of the anterior part of the ischial tuberosity accommodation part 11. The lesser trochanter support parts 23 are located approximately 5 mm higher than the ischial tuberosity accommodation part 11. The lesser trochanter support parts 23 are connected to the ischial tuberosity accommodation part 11 and have an inclined surface that becomes higher the further away from the ischial tuberosity accommodation part 11.

[0027] The sacrum support portion 25 is a portion that mainly supports the sacrum, and is located in the center behind the ischial tuberosity accommodation portion 11. The sacrum support portion 25 is connected to the ischial tuberosity accommodation portion 11 and has a curved, inclined surface that becomes higher the further away from the ischial tuberosity accommodation portion 11 (see FIG. 4(A)).

[0028] The buttocks support portion 27 is a portion that mainly supports the buttocks, and is disposed behind the ischial tuberosity housing portion 11 so as to be sandwiched between the sacrum support portion 25 and the left and right greater trochanter support portions 21. The buttocks support portion 27 is connected to the left and right rear portions of the ischial tuberosity housing portion 11, and has an inclined surface that becomes higher the further away from the ischial tuberosity housing portion 11. This inclined surface is not a smoothly curved surface, but is composed of a series of inclined surfaces with different inclination angles.

[0029] The sacrum support portion 25 and the buttocks support portion 27 support the back of the pelvis from the back toward the center, and together with the support of the perineal ridge 31, which is one of the ridges, form a three-point fixation; leaning backward Prevent.

[0030] The thigh support section 29 is a section that mainly supports the thighs, and is disposed in front of the lesser trochanter support section 23 so as to connect to each of the left and right lesser trochanter support sections 23. The thigh support section 29 is lowest at the section that connects to the lesser trochanter support section 23, and rises forward at a substantially constant angle, with the front end being the highest. The cross section of the thigh support section 29 is a curved surface that is concave downward.

[0031] The ridge portion is a region formed higher than the support portion, and includes a perineal ridge 31, an interfemoral ridge 33, and an outer femoral ridge 35.

[0032] The perineal ridge 31 is a raised area located in front of the ischial tuberosity housing portion 11, and the lesser trochanter support portion 23 is connected to both left and right ends of the perineal ridge 31. When viewed from the left to right, the perineal ridge 31 is highest in the center and slopes gently downward toward the lesser trochanter support portion 23.

[0033] The inter-femoral ridge 33 is a raised portion located between the left and right thigh support portions 29, and is formed up to the front end of the seat body 10 so as to separate the left and right thigh support portions 29. The base end (rear end) of the inter-femoral ridge 33 is connected to the perineal ridge 31. The side surfaces of the inter-femoral ridge 33 are also the side surfaces of the thigh support portions 29. The width (left-right direction) of the inter-femoral ridge 33 increases towards the front end in a plan view.

[0034] The outer thigh ridges 35 are raised portions located on the outside of the left and right thigh support parts 29, and extend to the front end of the seat main body 10. The rear end of the outer thigh ridges 35 connects to a ridge formed on the outer periphery of the greater trochanter support part 21. Rear ridges 37 are also formed on the outer peripheries of the buttocks support part 27 and the sacrum support part 25, and it can be said that the outer peripheries of both sides and the rear of the seat main body 10 are surrounded by ridges.

[0035] The support parts and banks arranged as described above cooperate with each other to form a support area that supports not only the floor side of the human body but also the sides of the human body. The support area includes a first support area that contacts the pelvis and a second support area that does not contact the pelvis.

[0036] The first support area is roughly the area located at a height of 0 to 2 cm from the bottom, and is composed of the lateral support area of ​​the pelvis, the back support area of ​​the pelvis, and the front support area of ​​the pelvis.

[0037] The lateral support region is formed by a pair of greater trochanter support parts 21 that support the greater trochanter of the femur from the front, back, and outside, sandwiching the pelvis, thereby maintaining the lateral stability of the pelvis.

[0038] The back support area is the area that comes into contact with the back of the pelvis when sitting, and includes the sacrum support part 25 and the left and right buttock support parts 27, which support the back of the pelvis in a band-like manner.

[0039] The front support region is the area that comes into contact with the front of the pelvis when sitting, and includes the perineal ridge 31 and the lesser trochanter support portion 23. With the perineal ridge 31 in the center, the area extends to the left and right lesser trochanter support portions 23, coming into contact with the front part of the pelvis and providing band-like support.

[0040] The second support region is roughly a region located at a height of 2 to 7 cm from the bottom surface, and includes greater trochanter support portion 21, buttock support portion 27, and thigh support portion 29.

[0041] As described above, the seat surface is centered around the ischial tuberosity accommodation section 11, and by appropriately arranging the various support sections and banks with different shapes and inclination angles around it, it is possible to concentrate the flow of force in 16 directions onto the ischial tuberosities, as shown in Figure 6. This allows for good posture and comfort simply by sitting down. The numbers in Figure 6 indicate the 16 directions toward the ischial tuberosities.

[0042] The appearance of the seat main body 10 is similar to the seat in a plan view, with the rear curved and the area excluding the rear rectangular in plan view. The bottom surface of the seat main body 10 is flat and the outer peripheral side surfaces are perpendicular to the bottom surface. The upper surfaces of the ridges formed on the outer periphery of the seat main body 10 are approximately the same height, and the upper surfaces of the ridges formed on the outer periphery of the seat main body 10 are the highest.

[0043] The seating position assistance device 1 is most effective when placed on a chair, wheelchair, car or bus seat, driver's seat, movie theater seat, etc., and it is preferable that the length L of the seating position assistance device 1 in the front-to-back direction is the same as the length of the chair seat in the front-to-back direction, or slightly longer than the length of the chair seat in the front-to-back direction so that the tip of the seating position assistance device 1 slightly protrudes from the chair seat when placed on the chair seat.

[0044] Urethane (high-resilience urethane) is preferred as the material for the seat body 10. A prototype seat body 10 was made using urethane and the comfort of sitting was evaluated. A test piece of the same urethane that gave good results was evaluated in the following manner, and the elastic modulus was found to be approximately 0.012 MPa.

[0045] The elastic modulus was determined by a compression test conducted in accordance with JIS K7181:2011 "Plastics - Determination of Compression Properties." The test was conducted using a Shimadzu AG-Xplus10KN at a compression rate of 5 mm / min. n=3 measurements were performed, and the elastic modulus was measured in the stress range of 0.003 to 0.005 MPa.

[0046] The cover 50 is a bag-like cover made of a sheet-like material that houses the seat body 10, allowing the seat body 10 to be easily inserted and removed. The size of the cover 50 is such that the seat body 10 fits inside with almost no gaps. Therefore, when the seat body 10 is placed inside the cover 50, the cover 50 comes into contact with the upper surface of the seat body 10's ridges, and spaces are formed between the cover 50 and each support part of the seat body 10 and the ischial tuberosity housing part 11. The material of the cover 50 is preferably fabric or terry cloth.

[0047] The main function of the cover 50 is to reinforce the seat body 10 and prevent deformation of the seat body 10, in particular to prevent the outer thigh ridges 35 from spreading outward when pressed by the thighs while sitting. The cover 50 is attached so that a space is formed between each support part of the seat body 10 and the ischial tuberosity accommodation part 11, so the cover 50 sinks when sitting. When the cover 50 is depressed, an inward tension is generated in the cover 50, which prevents the outer thigh ridges 35 from spreading outward even when pressed by the thighs.

[0048] When a person sits down, the tension generated in the cover 50 acts to support not only the bottom but also the sides of the occupant's buttocks and thighs. Although the tension of the cover 50 only slightly supports the buttocks and thighs, this improves comfort and stabilizes the sitting posture.

[0049] In this embodiment, the cover 50 is bag-shaped and houses the seat body 10, but a sheet-like member may also be fixed to the upper surface of the seat body 10 so that a space is formed between each support part of the seat body 10 and the ischial tuberosity housing part 11, and this may serve as the cover 50. Such a cover also functions similarly to the bag-shaped cover 50.

[0050] As described above, the main function of the cover 50 is to prevent the thigh outer ridges 35 from being pushed by the thighs and spreading outward while the wearer is seated. If widening the width ΔW of the thigh outer ridges 35 can prevent the thigh outer ridges 35 from being pushed by the thighs and spreading outward, the cover 50 may be omitted.

[0051] As described above, in the sitting position assist device 1 of the first embodiment, the main function of the cover 50 is to reinforce the seat body 10 and prevent deformation of the seat body 10, but the cover 50 that houses the seat body 10 also has the function of preventing the seat body 10 from getting dirty and being damaged. Therefore, there is an advantage to attaching the cover 50 even to a seat body 10 in which the width ΔW of the outer thigh ridge 35 is wide.

[0052] The human body is pushed downward by gravity, causing it to collapse outward. For example, if the support at the back of the pelvis is lost, gravity will push the sitting posture backward, and the thighs will also be pulled via the pelvis. A backrest can provide stability by pushing the back, but it also creates a force that causes the rear to open outward, significantly reducing comfort. Meanwhile, the human body can maintain posture thanks to the stiffness of the bones and the ability of muscles to pull the bones together, but fatigue sets in over time and posture collapses.

[0053] In response to this, the sitting position assist device 1 has the following effects.

[0054] The seating assistance device 1 is designed to provide optimal weight support from an anatomical and kinematic perspective, with the support shapes necessary for maintaining posture positioned on each part of the seat body. This guides the human body into the optimal position for maintaining a sitting posture. The seat shape is symmetrical from left to right and front to back (long in front, short in back), which increases comfort and stability, allowing for good posture and comfort simply by sitting. The tension generated in the cover 50 also provides stability for the human body and a comfortable contact.

[0055] In this way, the shape and structure of the seat allow optimal load and posture maintenance for each of the bones and hard and soft tissues of the human body to be achieved unconsciously, allowing you to enjoy a comfortable, pleasant sitting environment that reduces fatigue from the moment you sit down.

[0056] 7 is an external view of a seating position assistance device 2 according to a second embodiment of the present invention, viewed diagonally from the front. The same components as those in the seating position assistance device 1 according to the first embodiment of the present invention shown in FIGS. 1 to 6 are designated by the same reference numerals, and their explanation will be omitted.

[0057] The exterior dimensions of the sitting position assistance device 2 for adults are typically a length L of 50 cm, a width W of 50 cm, and a height H of 7 to 9 cm, as shown in Figure 7. However, the exterior dimensions of the sitting position assistance device 2 are not limited to these.

[0058] The sitting position assistance device 2 of the second embodiment differs from the sitting position assistance device 1 of the first embodiment in that it has a seat main body 10 but does not have a cover 50. The sitting position assistance device 2 of the second embodiment increases the width ΔW of the outer thigh mounds 35 to prevent the outer thigh mounds 35 from being pushed by the thighs and spreading outward while sitting. This eliminates the need to attach the cover 50. However, like the sitting position assistance device 1 of the first embodiment, the cover 50 may be attached and used to protect the seat main body 10 from dirt and damage.

[0059] Furthermore, the sitting position assist device 2 of the second embodiment is provided with thigh front end trims 40 at the front ends of each of the left and right thigh support parts 29, which support the area from the back of the front thighs to the backs of the knees. The thigh front end trims 40 are sloped downward in front when viewed from the side, and have a curved surface that is concave downward in cross section. The thigh front end trims 40 contribute to improving sitting comfort from the back of the front thighs to the backs of the knees, and when used on the seat of a wheelchair, they also have the effect of stabilizing movement by providing a sense of contact with the ground at the backs of the knees when standing up or sitting down from the wheelchair.

[0060] The rear outer periphery of the seating position assistance device 2 of the second embodiment is linear, and the seating position assistance device 2 has a rectangular shape in plan view. The external shape and size of the rear of the seating position assistance device 2 can be selected appropriately depending on the purpose of use, the size and shape of the seat on which it will be placed, etc.

[0061] The above describes the sitting position assistance device of the present invention using the sitting position assistance devices 1 and 2 of the first and second embodiments, but the sitting position assistance device of the present invention is not limited to these embodiments and can be modified within the scope that does not change the gist of the device.

[0062] In the first and second embodiments of the seating assistance devices 1 and 2, a rear bank 37 is provided behind the sacrum support portion 25 and the buttocks support portion 27, but when the seating assistance device of the present invention is placed on the seat of a chair with a backrest and used, and the back of the chair has a shape equivalent to the rear bank 37, the rear bank 37 is not necessary in the seating assistance device of the present invention.

[0063] Furthermore, the sitting position assistance device 1 of the first embodiment may be provided with a thigh front end trim 40. When the sitting position assistance device 1 of the first embodiment is provided with the thigh front end trim 40, a cover 50 is provided to cover the seat main body 10 including the thigh front end trim 40.

[0064] Although the preferred embodiment has been described with reference to the drawings, those skilled in the art will easily imagine various changes and modifications within the scope of the present invention upon reading the present specification. Therefore, such changes and modifications are to be interpreted as falling within the scope of the invention as defined by the claims. [Explanation of symbols]

[0065] 1,2 Sitting aids 10 Seat body 11. Ischial tuberosity housing 21 Greater trochanter support 23 Lesser trochanter support 25 Sacral support 27 Buttock support part 29 Thigh support part 31 Perineal embankment 33 Interfemoral crest 35 External femoral crest 37 Rear embankment 40 Front thigh trim 50 Cover

Claims

1. an ischial tuberosity receiving portion formed of a recess or a through hole for receiving the ischial tuberosity; a support portion having an inclined surface that is provided around the ischial tuberosity receiving portion and that increases in height outward from the ischial tuberosity receiving portion; A seat body including The seat body has a seat surface that is angled at a surface that contacts the buttocks and thighs and accommodates and supports the buttocks and thighs, The seat surface has the ischial tuberosity receiving portion at the lowest position, and the inclination angle of the surface that comes into contact with the body is close to vertical in areas with little muscle mass, centered around the ischial tuberosity, and close to horizontal in areas with a lot of muscle mass; The support portion includes at least a sacrum support portion disposed at the rear center of the ischial tuberosity accommodation portion, and a pair of left and right buttock support portions disposed adjacent to the sacrum support portion, The ischial tuberosity accommodation portion is characterized in that, in a plan view, the rear central portion connected to the sacral support portion is curved so as to widen rearward, and the rear central portion connected to the sacral support portion and the portion connected to the buttock support portion are curved in opposite directions.

2. The seating assistance device according to claim 1, wherein the ischial tuberosity receiving portion has a flat shape that is long in the left-right direction in a plan view.

3. The seating assistance device according to claim 2, wherein the ischial tuberosity receiving portion has a ratio of its front-to-back length to its left-to-right width in a plan view of width / length≈3.

4. The support portion further includes a pair of greater trochanter support portions disposed on both sides of the ischial tuberosity receiving portion, and a pair of lesser trochanter support portions disposed in front of the ischial tuberosity receiving portion, 2. The seating position assist device according to claim 1, wherein the sacrum support portion, the buttocks support portion, the greater trochanter support portion, and the lesser trochanter support portion are inclined at different angles relative to the bottom surface of the seat body.

5. a perineal ridge that is disposed in front of the ischial tuberosity receiving portion and is connected to the lesser trochanter support portion and is formed higher than the lesser trochanter support portion; The seating assistance device according to claim 4, characterized in that the sacrum support portion and the buttocks support portion support the back of the pelvis from the back toward the center, and together with the support of the perineal ridge form three-point fixation, preventing backward tilt.

6. Further, a cover for covering the seat body is provided, the cover covers the seat body so that a space is formed between the cover itself and the ischial tuberosity receiving portion and the support portion; 2. The seating assistance device according to claim 1, wherein when the user sits down, the cover sinks and tension is generated in the cover, and the tension acts to prevent deformation of the seat body.

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