JP2010035969A - Chair cushion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair cushion which makes a seat part hardly fatigued and securely presses the thigh part to make support more stable during sitting. <P>SOLUTION: The chair cushion C includes a seat part 1 with a seat surface 2 to support the hipbone and the thigh parts of both right and left legs. The seat part 1 is configured with a base plate 10, a cushion part 20 set to the upper surface 11 side of the base plate 10, and a surface cloth 30 set on the upper surface of the cushion part 20 to form the seat surface 2. Hipbone holes 13 penetrating through the base plate 10 from the upper surface 11 to the lower surface 12 are formed at positions corresponding to the hipbone parts of the base plate 10, and a pair of dent parts 15 recessed deeper than the general surface 14 of the upper surface 11 of the base plate 10 are formed on positions corresponding to the thigh parts of both right and left legs on the upper surface 11 of the base plate 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chair cushion that is used in a chair, a wheelchair, and the like, and reduces the burden on the sciatic region and the thighs of both left and right legs when sitting.

Conventionally, as this type of cushion for a chair, for example, one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 8-140784) is known. As shown in FIG. 7, the chair cushion Ca includes a seat portion 100 having a seat surface 101 that supports the ischial portion and the thighs of both the left and right legs when sitting. The seat portion 100 is composed of a flat plate made of a resin-based foam material such as synthetic rubber, urethane rubber, polyethylene, and the like, and is provided with a sciatic hole 102 facing the sciatic portion at the center of the seat portion 100 when seated. A crotch wall 103 is integrally raised in the middle of the side.
When seated on the chair cushion Ca, the sciatic portion enters the sciatic hole 102 and is supported, and the thighs of the left and right legs straddle the crotch wall 103 and are supported by a flat plate. Since the flat plate is made of the cushioning material as described above, the burden on the sciatic and thighs during sitting is reduced.

JP-A-8-140784

  However, in this conventional chair cushion Ca, since the seat portion 100 and the crotch wall 103 are composed only of cushioning materials, the function as a cushion gradually deteriorates as it is used. In addition, there was a problem that the sitting comfort became worse. In addition, although the crotch wall 103 is provided, since the portion where the thigh is supported when sitting is a flat plate, the thigh is not sufficiently pressed when sitting, and the thigh is easy to move. There was a problem that the support of the thigh at the time of sitting became unstable.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide a chair cushion that makes it difficult to sag the seat and that reliably supports the thigh when seated to stabilize the support. To do.

  In order to achieve such an object, the chair cushion according to the present invention is the chair cushion including a seat portion having a seat surface that supports the ischial portion and the thighs of both the left and right legs when seated. Is provided with a base plate, a cushion portion provided on the upper surface side of the base plate, and a surface material provided on the upper surface of the cushion portion to form the seat surface, and corresponds to the sciatic portion of the base plate A pair of recesses that are recessed from the general surface of the upper surface of the base plate in the region corresponding to the upper thighs of the left and right legs on the upper surface of the base plate. The structure is formed.

  Thus, when the user is seated on the seating surface, the sciatic portion is located at the position of the sciatic hole, and the sciatic portion tries to enter the sciatic hole by weight. Also, the thighs of the left and right legs are positioned at the pair of recesses, and the thighs try to enter the recesses by the weight. At this time, a cushion part is provided on the upper surface side of the base plate, and the ischial part and the thigh part are supported by the cushion part. That is, at the time of sitting, the sciatic part enters the sciatic hole and the thigh enters the recess through the cushion part, so that the sciatic part and the thigh can be pressed and supported respectively. The support of the sciatic and thighs is stable. In addition, since the sciatic hole and the recess are formed in the base plate and covered with the cushion part, the position of the sciatic hole and the recess is compared with the case where the sciatic hole and the recess are directly formed in the cushion material. Since the shape does not change, the guide is firm, so that the support of the ischial part and the thigh at the time of sitting is stable. Further, since the sciatic part and the thigh can be reliably supported by the cushion part when sitting, the cushion part reduces the burden on the sciatic part and the thigh when sitting. Accordingly, the blood flow hindrance at the sciatic and thighs during sitting can be minimized, so that fatigue can be made difficult even when sitting for a long time. In addition, since it is difficult to get tired even if sitting for a long time, it is possible to always maintain a correct sitting posture, and therefore, it is possible to obtain posture correction effects such as improvement of the sitting posture. Furthermore, since the seat portion is configured by using the base plate, it is difficult to sag even after repeated use, and the function as a cushion can be maintained and the sitting comfort can be maintained.

  And if necessary, the recess of the base plate is formed so as to incline downward from the portion corresponding to the base of the thigh toward the front end side of the base plate. As a result, the recess can be supported by following the thigh, and the thigh can be pressed more securely, so that the support can be stabilized and the sitting posture can be facilitated. In addition, it is possible to minimize the blood flow obstruction at the sciatic and thighs when sitting, and therefore, it is possible to make it difficult to get tired even if sitting for a long time.

  Moreover, it is set as the structure which provided the projection part which faces between the thigh part of right-and-left both legs at the time of seating at the front-end side of the said seat part between the said pair of recesses as needed. As a result, the thighs of the left and right legs are positioned across the protrusions, so that the thighs can be more reliably pressed and the support can be stabilized. In addition, since the left and right legs are seated slightly open, the sitting posture can be made easier.

  Furthermore, if necessary, the protrusion is provided with a base body having upper and lower surfaces that are detachably attached to the base plate, a cushion body provided on the upper surface of the base body, and a protrusion provided on the upper surface of the cushion body. It comprises a partial surface and an attachment / detachment mechanism that allows the base body to be attached to and detached from the base plate. As a result, even if the thighs of the left and right legs collide with the protrusions, the protrusions are configured using the cushion body, so this cushion body absorbs the impact, and thus the burden on the thighs is reduced. It is reduced. Moreover, since the protrusion is configured using the base body, it is difficult to sag even after repeated use, and the function as a cushion can be maintained. In addition, since the protrusions are detachable from the base plate, if the protrusions become dull or dirty, remove these protrusions with the attachment / detachment mechanism and attach other protrusions with the attachment / detachment mechanism. It can be replaced with a department.

  Furthermore, if necessary, the attaching / detaching mechanism is provided with a nut provided in the base body, a bolt insertion hole formed at a position corresponding to the nut and penetrating the base plate, and inserted through the bolt insertion hole. And a bolt that is screwed onto the nut. Thus, when attaching the protrusion, the base body is brought into contact with the base plate with the nut corresponding to the bolt insertion hole of the base plate, and then the bolt is inserted into the bolt insertion hole and screwed into the nut. . Moreover, when removing a projection part, the screwing of a volt | bolt and a nut is cancelled | released, and a volt | bolt is removed from a nut and a bolt penetration hole. Since it is only necessary to screw the bolt into the nut and unscrew it, the protrusion can be attached and detached relatively easily.

  And if needed, it is set as the structure provided with the sciatic cushion fitted to the said sciatic hole, and the net-like support sheet provided in the said base board and supporting the said sciatic cushion. As a result, since the sciatic part is supported by the cushion part and the sciatic cushion at the time of sitting, it is possible to further suppress the blood flow inhibition at the sciatic part at the time of sitting, and therefore, it is difficult to get tired even if sitting for a long time. . In addition, since the sciatic cushion is supported by the support sheet, it is possible to prevent the sciatic cushion from coming off from the sciatic hole. Since the support sheet is formed in a net-like shape, the air permeability is good, so that the sciatic cushion can be kept clean.

  Moreover, it is set as the structure which provided the protruding part which protrudes the rear-end edge part of the said seat part, and a both-sides edge part in the said cushion part as needed. As a result, the raised portion comes into contact with the outer side of the thigh and the buttocks at the time of sitting, so that the support of the ischial portion and the thigh is further stabilized. In addition, since the sciatica and thighs are located in a place surrounded by the protuberances and protrusions, the thighs can be prevented from being displaced to the left and right, as well as from front to back. The seating position can be prevented from shifting.

  Further, if necessary, the maximum thickness H inside the raised portion is set to 20 mm ≦ H ≦ 45 mm. Thereby, when using the seat part of the present invention on a seat part of an existing chair such as a wheelchair, for example, when the seat part is thick, when the seat part is placed on the seat part of the wheelchair, However, there is a problem that the sitting height becomes high, the sitting posture becomes unstable, and the blood flow of the sciatic part and the thigh is disturbed. However, the maximum thickness H inside the raised part is within the above range. By doing so, the seating height at the time of sitting can be set to an appropriate height, so that the sitting posture can be stabilized and the inhibition of blood flow in the sciatic and thighs at the time of sitting can be minimized. It is possible to make it difficult to get tired even if sitting for a long time.

  Furthermore, if necessary, the air inside the cushion part is removed to cover the surface material. Thus, the outer cover is covered after the cushion portion is compressed to some extent, so that the outer cover is easily covered. Further, since the cushion portion is compressed to some extent, the deformation of the cushion portion during sitting is suppressed, and the support of the ischial portion and the thigh during sitting is stabilized. Furthermore, the thickness of the cushion portion can be reduced by removing air from the cushion portion. That is, for example, when using the seat portion of the present invention on the seat portion of an existing chair such as a wheelchair, if the seat portion is thick, the thickness of the seat portion when placed on the seat portion of the wheelchair is There is a problem that the sitting height becomes high, the sitting posture becomes unstable, and the blood flow of the sciatic region and the thigh is disturbed, but the seat portion of the present invention can be formed thin. The seating height can be kept low, so that the sitting posture can be stabilized, the blood flow in the sciatic and thighs can be kept to a minimum during sitting, and it is difficult to get tired even if sitting for a long time. can do.

  If necessary, a frame-shaped reinforcing bracket is provided on the lower surface of the rear end side of the base plate, and the rear end side of the reinforcing bracket is associated with a seat portion of an existing chair that hangs downward from the reinforcing bracket. It is the structure which provided the drooping body which can be stopped. Thus, for example, even when the seat portion of the present invention is mounted on a seat portion of an existing chair such as a wheelchair, the seat portion is reinforced by the reinforcing metal fittings. Even if it exists, the effect | action and effect of a seat part can be show | played reliably. Moreover, since a hanging body latches on the seat part of the existing chair, the situation where the seat part of this invention slips ahead from the seat part of a wheelchair can be prevented.

  According to the chair cushion of the present invention, a sciatic hole is provided in a portion corresponding to the sciatic portion of the base plate of the seat portion, and a pair of recesses are formed in the portion corresponding to the thighs of the left and right legs of the base plate. When the user sits on the seating surface, the sciatic part enters the sciatic hole and the thigh enters the recess through the cushion part, so that the sciatic part and the thigh can be pressed and supported respectively. Therefore, the support of the sciatic part and the thigh at the time of sitting is stabilized. In addition, since the sciatic hole and the recess are formed in the base plate and covered with the cushion part, the position of the sciatic hole and the recess is compared with the case where the sciatic hole and the recess are directly formed in the cushion material. Since the shape does not change, the guide is firm, so that the support of the ischial part and the thigh at the time of sitting is stable. Further, since the sciatic part and the thigh can be reliably supported by the cushion part when sitting, the cushion part reduces the burden on the sciatic part and the thigh when sitting. Accordingly, the blood flow hindrance at the sciatic and thighs during sitting can be minimized, so that fatigue can be made difficult even when sitting for a long time. Moreover, since the seat part is comprised using the base board, it is hard to sag even if it uses repeatedly, the function as a cushion is maintained, and sitting comfort can be maintained.

Hereinafter, a chair cushion according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 6 show a chair cushion C according to an embodiment of the present invention. This chair cushion C includes a seat portion 1 having a seat surface 2 that supports the sciatic portion and the thighs of both left and right legs when sitting, and a protrusion 50 provided on the front end 3 side of the seat portion 1. . In the present embodiment, as shown in FIG. 6, the chair cushion C is placed on the seat Wa of the wheelchair W and used.

  1 to 6, the seat portion 1 includes a base plate 10, a cushion portion 20 provided on the upper surface 11 side of the base plate 10, and a surface material provided on the upper surface of the cushion portion 20 to form a seat surface 2. 30 and a lining 40 provided on the lower surface 12 of the base plate 10, and is formed in layers.

  As shown in FIGS. 1 and 3 to 5, the base plate 10 is composed of a rectangular rigid member. A portion corresponding to the sciatic portion of the base plate 10 is provided with a sciatic hole 13 penetrating from the upper surface 11 to the lower surface 12 of the base plate 10, and corresponds to the upper surface 11 of the base plate 10 and the thighs of both left and right legs. A pair of recesses 15 that are recessed from the general surface 14 of the upper surface 11 of the base plate 10 are formed in the portion to be formed.

  The sciatic hole 13 is a through hole formed in a rectangular shape, and a pair is provided so as to correspond to the left and right sciatic bones. A sciatic cushion 16 made of a cushion material such as urethane is fitted in each sciatic hole 13. A mesh-like support sheet 17 that supports the sciatic cushion 16 is provided on the lower surface of the sciatic cushion 16. In the embodiment, the support sheet 17 is configured using a stretchable material. The support sheet 17 is attached to the base plate 10 and prevents the sciatic cushion 16 from falling off to the lower surface 12 side of the base plate 10 when seated.

  The recess 15 is formed on the front end 18 side of the base plate 10 and is formed so as to incline downward from the portion corresponding to the base of the thigh toward the front end 18 side of the base plate 10. Moreover, it forms so that it may become gradually wide toward the front end 18 side of the base board 10 from the part corresponding to the base of the thigh.

  As shown in FIGS. 1, 4 and 5, the cushion portion 20 includes a main cushion 21 whose upper and lower surfaces are formed in the same shape as the base plate 10, a sub-cushion 22 provided on the upper surface of the main cushion 21, and a main cushion. 21 is provided with a raised portion 23 that is provided on the lower surface of the seat portion 21 and raises the rear end edge portion 4 and both side edge portions 5 of the seat portion 1.

The main cushion 21 is made of a cushion material such as urethane, and a notch 24 is formed in a shape corresponding to the protrusion 50 at a portion where the protrusion 50 is provided. In the embodiment, the main cushion 21 has a thickness of 30 mm.
The sub-cushion 22 is formed in the same shape as the main cushion 21 at the upper and lower surfaces. In the embodiment, the sub-cushion 22 has a thickness of 10 mm.

  The raised portion 23 is provided on the base plate 10 so as to be formed in a U shape from the rear end edge portion 4 to the both side end edge portions 5 of the seat portion 1. In the embodiment, the raised portion 23 is made of a cushion material such as urethane and has a thickness of 10 mm. Since a part of the main cushion 21 is in contact with the upper surface of the raised portion 23 and the other part of the main cushion 21 is in contact with the base plate 10, a part of the main cushion 21 is raised.

As shown in FIG. 1, FIG. 2, FIG. 4, FIG. 5 and FIG. 6, the upper and lower surfaces are formed in the same shape as the subcushion 22 and are provided on the upper surface of the subcushion 22. The outer material 30 is formed of synthetic leather in the embodiment.
As shown in FIGS. 1, 3, 4, and 5, the lining 40 has an upper and lower surface formed in the same shape as the base plate 10, and is formed of cloth in the embodiment.

  Further, as shown in FIGS. 1, 4, 5, and 6, the seat portion 1 is provided with a frame-shaped reinforcing bracket 6 on the lower surface 12 on the rear end 19 side of the base plate 10. A hanging body 7 that can be locked to a seat portion of an existing chair that hangs downward from the reinforcing metal fitting 6 is provided at the rear edge 6 a of the reinforcing metal fitting 6. A pair of hanging bodies 7 hang from both side edges 6b of the rear end edge 6a of the reinforcing metal fitting 6, and a vinyl protective cover (not shown) is hung on the hanging bodies 7.

As shown in FIGS. 1 to 6, the protrusion 50 is on the front end 3 side of the seat 1 and between the pair of recesses 15 of the base plate 10 so as to face between the thighs of the left and right legs when seated. It is detachable.
The protrusion 50 includes a base body 51 having upper and lower surfaces that are detachably attached to the base plate 10, a cushion body 52 provided on the upper surface of the base body 51, and a protrusion surface 53 provided on the upper surface of the cushion body 52. And an attachment / detachment mechanism 54 that allows the base body 51 to be attached to and detached from the base plate 10.

As shown in FIGS. 1 and 5, the base body 51 has a trapezoidal upper and lower surface. In the embodiment, the base body 51 is made of the same material as the base plate 10.
As shown in FIGS. 1 and 5, the cushion body 52 is made of a cushion material such as urethane, and the upper and lower surfaces thereof are formed in the same shape as the base body 51. In the embodiment, the cushion body 52 has a thickness of 30 mm.
As shown in FIGS. 1 to 6, the protrusion surface 53 is formed on the upper surface of the cushion body 52 so that the upper and lower surfaces are formed in the same shape as the cushion body 52. This protrusion part surface material 53 is formed with the synthetic leather similar to the surface material 30 in embodiment.

  As shown in FIGS. 1, 3, and 5, the attachment / detachment mechanism 54 is formed in a pair of nuts 55 provided on the base body 51, and is formed at a position corresponding to the nuts 55 and penetrates from the upper surface 11 to the lower surface 12 of the base plate 10. A bolt insertion hole 56 and a bolt 57 inserted through the bolt insertion hole 56 and screwed into the nut 55 are provided.

  When manufacturing the cushion C for chairs of this invention comprised in this way, the air in the cushion part 20 is extracted and the surface material 30 is coat | covered. In the embodiment, since the support sheet 17 and the lining 40 are made of a breathable material, when the cushion part 20 is pressed, the air in the cushion part 20 is released from the support sheet 17 and the lining 40, and the cushion part Since 20 can be compressed to some extent, it can be easily covered with the outer material 30.

  And the air in the cushion part 20 is extracted, and the maximum thickness H of the layer of the base plate 10, the cushion part 20, and the surface material 30 inside the raised part 23 is formed so that 20 mm ≦ H ≦ 45 mm. Desirably, 30 mm ≦ H ≦ 35 mm. In the embodiment, H = 30 mm.

Therefore, the chair cushion C according to this embodiment operates as follows.
First, as shown in FIG. 6, the chair cushion C is placed on the seat Wa of the wheelchair W. At this time, the lining 40 of the seat portion 1 is brought into contact with the seat portion Wa of the wheelchair W, and the hanging body 7 of the reinforcing bracket 6 is placed so as to be positioned on the rear end edge Wb side of the seat portion Wa of the wheelchair W.

  In this state, the user sits on the seat surface 2 of the seat portion 1. At this time, the seat surface 2 is such that the rear edge 4 and both side edges 5 are raised by the raised portion 23, and the projecting portion 50 also faces between the thighs of the left and right legs. Therefore, the user sits on the place surrounded by the raised portion 23 and the protruding portion 50 so that the ischial portion and the thigh portion are located. That is, the user sits so that the thighs of the left and right legs are positioned across the protrusion 50. Accordingly, it is possible to prevent the thigh from being displaced to the left and to the right and to the back and forth, thereby preventing the seating position from being displaced. Moreover, since the thighs of the left and right legs are positioned across the protrusion 50, the thighs can be reliably pressed and the support can be stabilized. Furthermore, since the left and right legs are seated slightly open, the sitting posture can be made easier.

  When the user sits on the seat surface 2, the sciatic portion is positioned at the position of the sciatic hole 13, and the sciatic portion tries to enter the sciatic hole 13 due to the body weight. Further, the thighs of the left and right legs are located at the positions of the pair of recesses 15, and the thighs try to enter the recesses 15 by weight. At this time, the cushion portion 20 is provided on the upper surface 11 side of the base plate 10, and the ischial portion and the thigh portion are supported by the cushion portion 20. That is, at the time of sitting, the sciatic portion enters the sciatic hole 13 and the thigh enters the recess 15 through the cushion portion 20, so that the sciatic portion and the thigh can be pressed and supported. In addition, the support of the sciatic part and the thigh when sitting is stable. Since the seat part 1 compresses the cushion part 20 to some extent, the deformation of the cushion part 20 at the time of sitting is suppressed, and also in this respect, the support of the sciatic part and the thigh is stabilized.

  Further, since the sciatic hole 13 and the recess 15 are formed in the base plate 10 and covered with the cushion portion 20, the sciatic hole is compared with the case where the sciatic hole 13 and the recess 15 are directly formed in the cushion material. Since the positions and shapes of the 13 and the recess 15 do not change, the guide is firm, so that the support of the sciatic part and the thigh at the time of sitting is stable. Since the recess 15 is formed so as to incline downward from the portion corresponding to the base of the thigh toward the front end 18 of the base plate 10, the recess 15 supports this following the thigh. Since the thigh can be pressed more reliably, the support can be stabilized and the sitting posture can be facilitated.

  Furthermore, since the sciatic part and the thigh can be reliably supported by the cushion part 20 when sitting, the cushion part 20 reduces the burden on the sciatic part and thigh when sitting. Accordingly, the blood flow hindrance at the sciatic and thighs during sitting can be minimized, so that fatigue can be made difficult even when sitting for a long time. In particular, since the sciatic part is supported by the cushion part 20 and the sciatic cushion 16, it is possible to further suppress the blood flow inhibition at the sciatic part at the time of sitting, and therefore, it is difficult to get tired even if sitting for a long time. can do. Further, since it is difficult to get tired even if sitting for a long time, it is possible to maintain a correct sitting posture at all times, and thus it is possible to obtain posture correction effects such as improvement of the sitting posture.

  Furthermore, since the sciatic cushion 16 is supported by the support sheet 17, it is possible to prevent the sciatic cushion 16 from being detached from the sciatic hole 13. Since the support sheet 17 is formed in a net shape, the air permeability is good, so that the sciatic cushion 16 can be kept clean. In particular, when the support sheet 17 is made of a stretchable material, the repelling action of the support sheet 17 makes the sciatic cushion 16 difficult to sag, so that the function as a cushion can be maintained and long-term Can be used for

  Further, since the raised portion 23 comes into contact with the outside of the thigh and the buttocks at the time of sitting, the support of the sciatic portion and the thigh is further stabilized, and the sciatic portion and the thigh are moved back and forth and right and left. Even so, this can be regulated. Further, when the sciatic part and the thigh are moved forward, backward, left and right, the thigh collides with the protrusion 50. In this case, too, the protrusion 50 is configured using the cushion body 52. The cushion body 52 absorbs the impact, so the burden on the thigh is reduced.

  In the chair cushion C of the present invention, the seat portion 1 is configured by using the base plate 10, so that the chair cushion C is difficult to sag even after repeated use and maintains a function as a cushion, thereby maintaining a sitting comfort. it can. Moreover, since the projection part 50 is also comprised using the base body 51, even if it uses repeatedly, it is hard to sag and can maintain the function as a cushion.

  Further, since the protrusion 50 is detachable from the base plate 10, when the protrusion 50 becomes dull or dirty, the protrusion 50 is removed by the attaching / detaching mechanism 54 and the other protrusions 50 are attached / detached. It can be attached by the mechanism 54 and replaced with a new protrusion 50. Specifically, when attaching the protrusion 50, the base body 51 is brought into contact with the base plate 10 with the nut 55 corresponding to the bolt insertion hole 56 of the base plate 10, and then the bolt 57 is inserted into the bolt insertion hole 56. Insert and screw into the nut 55. Further, when removing the protrusion 50, the screw 57 is released from the nut 55 and the bolt 57 is removed from the nut 55 and the bolt insertion hole 56. Since the bolt 57 only needs to be screwed into the nut 55 and unscrewed, the protrusion 50 can be attached and detached relatively easily.

  Further, even when the seat portion 1 is placed on the seat portion Wa of the wheelchair W as in the present embodiment, the seat portion 1 is reinforced by the reinforcing metal fittings 6. Even if it is such a material, the effect | action and effect of the seat part 1 can be show | played reliably. Furthermore, even if the sciatic part and the thigh are about to move back and forth and right and left when sitting, the hanging body 7 provided on the seat part 1 is locked to the rear edge Wb of the seat part Wa of the wheelchair W. It is possible to prevent the seat 1 from slipping forward from the seat Wa.

  Furthermore, when using the seat part 1 on the seat part Wa of the wheelchair W as in this embodiment, if the seat part 1 is thick, the seat part is placed on the seat part Wa of the wheelchair W. However, the chair cushion C according to the present invention has a problem in that the sitting height becomes high at the thickness of 1, the seating posture becomes unstable, and the blood flow in the sciatic and thighs is disturbed. 10, the sciatic hole 13 and the recess 15 are formed. Therefore, even if the cushion portion 20 is formed thin, the sciatic portion and the thigh can be reliably supported. The seat height can be kept low by reducing the thickness. In addition, since the maximum thickness H inside the raised portion 23 is formed to be 20 mm ≦ H ≦ 45 mm, the thickness of the seat portion 1 can be made appropriate, and the seat height can be made appropriate. it can. That is, even when the seat portion 1 is used on the seat portion Wa of the wheelchair W, the sitting posture can be stabilized, and the blood flow inhibition at the sciatic portion and thigh at the time of sitting can be minimized. Therefore, even if it sits for a long time, it can make it hard to get tired. In particular, in the case of a wheelchair W with an armrest, if the sitting height is high, the elbow floats without riding on the armrest and it becomes difficult to maintain a sitting posture. Since the seat 20 can be kept low by reducing the thickness of the cushion portion 20, the sitting posture can be stably held, and the blood flow in the sciatic and thighs can be minimized while sitting. Therefore, even if sitting for a long time, it can be made hard to get tired.

  In addition, in the said embodiment, although the cushion C for chairs was mounted and used for the seat part Wa of the wheelchair W, it is not necessarily limited to this, You may use for what kind of chair, and change suitably. It doesn't matter. Further, for example, a leg portion may be provided on the lower surface of the chair cushion C, and the chair may be formed using the chair cushion C.

It is a disassembled perspective view which shows the cushion for chairs concerning embodiment of this invention. It is a top view which shows the cushion for chairs which concerns on embodiment of this invention. It is a bottom view which shows the cushion for chairs concerning embodiment of this invention. It is AA sectional drawing which shows the cushion for chairs concerning embodiment of this invention. It is a BB sectional view showing a cushion for chairs concerning an embodiment of the invention. It is a figure which shows the cushion for chairs which concerns on embodiment of this invention in the use condition. It is a figure which shows an example of the conventional cushion for chairs.

Explanation of symbols

C Chair cushion W Wheelchair 1 Seat 2 Seat surface 3 Front end 4 Rear edge 5 Side edge 6 Reinforcement 7 Suspended body 10 Base plate 11 Upper surface 12 Lower surface 13 Sciatic hole 14 General surface 15 Recess 16 Sciatic cushion 17 Support sheet 18 Front end 19 Rear end 20 Cushion portion 21 Main cushion 22 Sub-cushion 23 Raised portion 30 Outer fabric 40 Lining 50 Protruding portion 51 Base body 52 Cushion body 53 Protruding portion outer material 54 Nut 56 Bolt insertion hole 57 Bolt

Claims (10)

In a cushion for a chair comprising a seat with a seat surface that supports the thighs of the left and right legs when sitting,
The seat portion includes a base plate, a cushion portion provided on the upper surface side of the base plate, and a surface material provided on the upper surface of the cushion portion to form the seat surface,
A sciatic hole penetrating from the upper surface to the lower surface of the base plate is provided in a portion corresponding to the sciatic portion of the base plate, and the upper surface of the base plate is formed on the upper surface of the base plate corresponding to the thighs of the left and right legs. A cushion for a chair, characterized in that a pair of recesses recessed from the general surface of the chair are formed.   The chair cushion according to claim 1, wherein the recess of the base plate is formed so as to incline downward from a portion corresponding to the base of the thigh toward the front end side of the base plate.   3. The chair according to claim 1, wherein a protrusion is provided between the pair of recesses on the front end side of the seat so as to be detachable between the thighs of the left and right legs when seated. cushion.   A base body having upper and lower surfaces that are removably attached to the base plate, a cushion body provided on the upper surface of the base body, a projection surface provided on the upper surface of the cushion body, and the base 4. The chair cushion according to claim 3, further comprising an attachment / detachment mechanism that allows the body to be attached to and detached from the base plate.   The attachment / detachment mechanism includes a nut provided in the base body, a bolt insertion hole formed at a position corresponding to the nut and penetrating the base plate, and a bolt inserted into the bolt insertion hole and screwed into the nut. The chair cushion according to claim 4, comprising:   The chair cushion according to any one of claims 1 to 5, further comprising: a sciatic cushion fitted into the sciatic hole; and a net-like support sheet provided on the base plate and supporting the sciatic cushion.   The chair cushion according to any one of claims 1 to 6, wherein the cushion portion is provided with a raised portion for raising the rear end edge portion and both side edge portions of the seat portion.   The cushion for a chair according to claim 7, wherein the maximum thickness H on the inner side of the raised portion is 20 mm ≤ H ≤ 45 mm.   The chair cushion according to any one of claims 1 to 8, wherein air in the cushion portion is removed to cover the outer surface.   A frame-shaped reinforcing bracket is provided on the lower surface of the rear end side of the base plate, and a hanging body that can be locked to a seat portion of an existing chair that hangs downward from the reinforcing bracket is provided on the rear end side of the reinforcing bracket. The chair cushion according to any one of claims 1 to 9, wherein the chair cushion is provided.

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