Seat cushion for chair or wheelchair

Abstract

To provide a seat cushion with improved ease of height adjustment. [Solution] The seat cushion is used as a backrest or seat of a chair or wheelchair. The seat cushion comprises a seat body extending along the backrest or seat, and one or more pockets provided in one or more areas on the back side of the seat body, which enclose a sheet-like height adjustment member, thereby enabling height adjustment of the one or more areas. The pockets have slits that open outwards from the seat body with a predetermined slit length, when the seat cushion is installed as a backrest or seat, so that the user can insert the height adjustment member into the pocket while remaining seated in the chair or wheelchair.

Description

Technical Field

[0001] The present invention relates to a seat cushion used for the backrest or seat surface of a chair or wheelchair.

Background Art

[0002] As a backrest or seat surface of a chair or wheelchair, various seat cushions are used to provide a comfortable sitting feeling for the seated person.

[0003] Patent Document 1 discloses a seat cushion for a wheelchair. Hereinafter, in this paragraph, the reference numerals of Patent Document 1 are shown in parentheses. The seat (3) is supported on the seat rail (2) of the wheelchair. The seat (3) has a seat shell (10), a seat-side seat cushion (11) and a backrest-side seat cushion (12) attached thereto. The seat shell (10) has a substantially L-shaped side view in which the seat portion (10a) and the backrest portion (10b) are integrated, and is formed of an appropriate material having relatively high rigidity such as metal or plastic, and is attached to the seat rail (2) with an appropriate member such as a screw. The seat-side seat cushion (11) attached to the seat portion (10a) is composed of a divided body divided into three parts in the front-rear direction, a front divided body (11a), an intermediate divided body (11b) and a rear divided body (11c). These divided bodies are each formed using a known cushion material such as polyurethane foam, and if necessary, the surface is covered with a skin, and is detachably attached to the seat portion (10a) by one-touch attachment using a known appropriate coupling member such as a snap fastener or a hook. The thicknesses of the divided bodies on the seat-side seat cushion (11) side are different from each other. The backrest-side seat cushion (12) side has the same structure as the seat-side seat cushion (11) side, and its thickness also changes similarly. When the seat shape does not fit the body type, it can be adapted to the user's preference by changing or replacing the arrangement of the divided bodies.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-085263 [Overview of the project] [Problems that the invention aims to solve]

[0005] The seat cushion described in Patent Document 1 is composed of multiple segments of different thicknesses, and by rearranging these segments, the height (thickness) of the seat cushion can be adjusted to suit the user. However, in conventional seat structures, it is difficult for the user to change the arrangement of the segments while seated in a wheelchair or chair, so when adjusting the height of the seat cushion, the user has to get out of the wheelchair (or chair) to do so. In other words, the user is required to get in and out of the wheelchair many times to adjust it until it suits their preference, which is a burden on the user.

[0006] This invention was made to solve the above problems, and its purpose is to provide a seat cushion with improved workability for height adjustment. [Means for solving the problem]

[0007] (Composition 1) One embodiment of the present invention is a seat cushion used as a backrest or seat for a chair or wheelchair, A seat body extending along the backrest or the seat surface, The sheet body comprises one or more pockets provided in one or more areas on the back side, which enclose a sheet-like height adjustment member, thereby enabling height adjustment of the one or more areas, The pocket is characterized in that, with the seat cushion installed as a backrest or seat, it has a slit portion that opens outwards from the seat body with a predetermined slit length, so that the user can insert the height adjustment member into the pocket while remaining seated in the chair or wheelchair.

[0008] According to one embodiment of the present invention, a pocket is provided in a predetermined area of ​​the seat body to enable height adjustment by enclosing a sheet-shaped height adjustment member. That is, the height of the seat cushion can be easily adjusted to suit the user's preference by inserting the sheet-shaped height adjustment member into the pocket selected by the user. In particular, the user can achieve a more preferred seating comfort by appropriately selecting the thickness, number, and material (flexibility) of the sheet-shaped height adjustment member. Furthermore, since the slit portion of the pocket opens outwards from the seat body with a predetermined slit length when the seat cushion is installed as a backrest or seat, the user can insert the height adjustment member into the pocket and adjust the height while remaining seated in the chair or wheelchair. In other words, the user (seated person) does not need to get on and off the chair or wheelchair multiple times to adjust the height of the seat cushion, making the height adjustment process easier. Moreover, when a caregiver performs the height adjustment for the user, the height can be adjusted while the user remains seated, making it possible to easily adjust the height of the seat cushion to suit the user's body type and preference.

[0009] (Configuration 2) A further embodiment of the present invention provides a seat cushion in which the pocket comprises a tab that extends from the outer skin of the pocket to the outside of the slit and is configured to rotate in a direction away from the back surface of the seat body, and the tab is deformed so as to expand the slit when pulled towards the back surface. In other words, if a flexible material is selected as the sheet-like height adjustment member, inserting the height adjustment member into the pocket becomes a difficult task, but by pulling the tab towards the back surface to expand the slit, the task of inserting the height adjustment member into the pocket becomes easier.

[0010] (Composition 3) A further embodiment of the present invention provides a seat cushion in which the pocket comprises a filling portion located at the back of the pocket and filled with the height adjustment member, and an introduction portion formed adjacent to the slit portion for introducing the height adjustment member into the filling portion. The width of the introduction portion and the length of the slit are greater than the width of the filling portion, and the outer edge of the slit portion is pulled to the back side, causing it to deform so that the entrance to the filling portion expands. In other words, if a flexible material is selected as the sheet-like height adjustment member, it is difficult to insert the height adjustment member into the filling portion of the pocket. However, by pulling the outer edge of the slit portion to the back side through the introduction portion, the entrance to the filling portion expands, making it easier to insert the height adjustment member into the pocket.

[0011] (Composition 4) A further embodiment of the present invention provides a seat cushion with a flap portion extending to the outside of the slit portion and for closing the slit portion of the pocket, wherein the flap portion has an adhesive portion that is detachably adhered to the adhesive portion on the outer surface of the pocket. The slit portion can be closed by the flap portion having a simple adhesive structure, preventing the height adjustment member from being exposed.

[0012] (Composition 5) A further embodiment of the present invention is a seat cushion characterized in that the flap portion is configured to hold the frame of the chair or wheelchair between the flap portion and the pocket when the adhesive portion is bonded to the adhesive portion to close the pocket. That is, the flap portion can also function as a connecting portion for connecting the seat cushion to the chair or wheelchair.

[0013] (Composition 6) A further embodiment of the present invention provides a seat cushion comprising a surface material and a cushioning material enclosed within the surface material to provide cushioning throughout, wherein the height adjustment member is added to any of the multiple pockets to form regions with different cushioning properties in the seat cushion.

[0014] (Composition 7) A further embodiment of the present invention is a seat cushion characterized in that the height adjustment member is a fabric product, a cushioning pad, or a combination thereof.

[0015] (Composition 8) One embodiment of the present invention is a seat cushion for a backrest used in the backrest of a chair or wheelchair, A seat body extending along the aforementioned backrest and having a predetermined cushioning property, The seat body is provided on the back side and comprises a pair of side pockets formed in the left and right side regions of the backrest, which enclose a sheet-like height adjustment member, thereby enabling height adjustment of the side regions. The pair of side pockets have lateral slits that open with a predetermined slit length toward the left and right outer sides of the backrest, with the backrest seat cushion installed, so that the user can insert the height adjustment member into the side pocket from the left and right outer sides of the backrest while remaining seated in the chair or wheelchair. Each of the aforementioned side pockets extends above or below the aforementioned side slit portion. The side pocket is characterized by having a tab that extends from the outer skin of the side pocket to the outside of the lateral slit and is configured to rotate in a direction away from the back surface of the seat body, and by the tab being pulled toward the back surface, the lateral slit is deformed in such a way that it expands.

[0016] (Composition 9) A further embodiment of the present invention provides a seat cushion for a backrest, comprising an upper pocket provided on the back side of the seat body and formed in the upper region of the backrest, the upper pocket containing a sheet-like height adjustment member, thereby enabling height adjustment of the side region. The upper pocket has an upper slit portion that opens upwards toward the backrest with a predetermined slit length, so that the user can insert the height adjustment member into the upper pocket from the upper side of the backrest while the user remains seated in the chair or wheelchair, when the backrest seat cushion is installed. The upper pocket comprises a filling portion located at the back of the upper pocket and filled with the height adjustment member, and an introduction portion formed adjacent to the upper slit portion for introducing the height adjustment member into the filling portion. The width of the introduction portion and the slit length of the upper slit portion are greater than the width of the filling portion, and the outer edge of the upper slit portion is pulled towards the back side, causing the entrance to the filling portion to deform and expand.

[0017] (Composition 10) One embodiment of the present invention is a method for inserting a height adjustment member made of a fabric product of a predetermined thickness into a side pocket of a backrest seat cushion according to claim 8 or 9, which is installed as a backrest on a chair or wheelchair, Pull the Velcro part of the side pocket to the back side, insert the plate-shaped jig around which the fabric product is wrapped into the side pocket through the side slit part, and place the fabric product in the side pocket by pulling out only the plate-shaped jig from the side pocket.

Effect of the Invention

[0018] The seat cushion of the present invention enables a user to insert a height adjustment member into a pocket while remaining seated on a chair or wheelchair, thereby improving the workability of height adjustment.

Brief Description of the Drawings

[0019] [Figure 1] (a) Schematic perspective view from the front side and (b) schematic perspective view from the back side of a seat cushion for a backrest according to an embodiment of the present invention. [Figure 2] Front view of the seat cushion for a backrest in FIG. 1. [Figure 3] Rear view of the seat cushion for a backrest in FIG. 1. [Figure 4] (a) Plan view, (b) side view, and (c) bottom view of the seat cushion for a backrest in FIG. 1. [Figure 5] (a) Cross-sectional view taken along line A-A and a partially enlarged view thereof, and (b) cross-sectional view taken along line B-B and a partially enlarged view thereof of the seat cushion for a backrest in FIG. 3. [Figure 6] A schematic diagram showing a method of inserting a height adjustment member (fabric product) into the side pocket of the seat cushion for a backrest in FIG. 1, and showing a form in which the Velcro part of the side pocket is rolled up and pulled to the back side to insert the height adjustment member into the side pocket. [Figure 7] A schematic diagram showing a method of inserting a height adjustment member (fabric product) into the upper pocket of the seat cushion for a backrest in FIG. 1, and showing a form in which the introduction part of the upper pocket is pulled to the back side to insert the height adjustment member into the upper pocket. [Figure 8]A schematic front view showing a seat cushion for a backrest, attached to the frame of a wheelchair, with height adjustment components inserted into pockets. [Figure 9] Figure 8 shows (a) cross-sectional view A'-A' and (b) cross-sectional view B'-B'. [Figure 10] (a) a schematic perspective view from the front side and (b) a schematic perspective view from the back side of a seat cushion for a seat surface according to one embodiment of the present invention. [Figure 11] Figure 10 is a plan view of the seat cushion for the seat surface. [Figure 12] Figure 10 shows a bottom view of the seat cushion for the seat surface. [Figure 13] (a) Front view, (b) Side view, and (c) Rear view of the seat cushion for the seat surface in Figure 10. [Figure 14] (a) Cross-sectional view of the CC section and a partially enlarged view thereof, and (b) Cross-sectional view of the DD section and a partially enlarged view thereof of the seat cushion shown in Figure 12. [Figure 15] A schematic plan view showing a seat cushion for a wheelchair, with height adjustment components inserted into pockets, attached to the wheelchair frame. [Figure 16] Figure 15 shows (a) the C'-C' section and (b) the D'-D' section. [Modes for carrying out the invention]

[0020] The following describes one embodiment of the present invention with reference to the drawings. Note that the shapes in the drawings referenced in the following description are conceptual or schematic diagrams for illustrating preferred shapes and dimensions, and the dimensional ratios, etc., do not necessarily correspond to actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios shown in the drawings.

[0021] The seat cushion of the present invention is used as a backrest or seat for a chair or wheelchair. In this specification, a backrest seat cushion 100 and a seat cushion 200 are described as embodiments of the seat cushion. Although these are described as being attached to a wheelchair 10, it goes without saying that the present invention is not limited to this.

[0022] Referring to Figures 1 to 5, the configuration of the backrest seat cushion 100 used in the backrest of the wheelchair 10 will be described. Figures 1(a) and 1(b) are schematic perspective views of the backrest seat cushion 100. Figure 2 is a front view of the backrest seat cushion 100. Figure 3 is a rear view of the backrest seat cushion 100. In Figures 2 and 3, the dotted line S indicates a sewn portion where the fabric is sewn together with thread or the like. Figures 4(a) to 4(c) are a top view, side view, and bottom view of the backrest seat cushion 100. Figures 5(a) and 5(b) are cross-sectional views of Figure 3, specifically AA and its enlarged section, and BB and its enlarged section.

[0023] As shown in Figures 1 to 5, the backrest seat cushion 100 comprises a seat body 101 that extends along the backrest of the wheelchair 10 (see Figure 8) and has a predetermined cushioning property, a pair of side pockets 111 provided on the back side of the seat body 101 and formed in the left and right side regions of the backrest, and an upper pocket 121 provided on the back side of the seat body 101 and formed in the upper region of the backrest.

[0024] As shown in Figure 5, the seat body 101 comprises a surface material 102 and a cushioning material 103 enclosed within the surface material 102 to provide cushioning throughout. In this embodiment, the surface side of the surface material 102 is formed of a breathable mesh fabric, and the back side is formed of a waterproof fabric. The cushioning material 103 can be selected from cotton, foamed resin material, etc. In this embodiment, the seat body 101 extends from the upper end to the lower end of the backrest frame 13 of the wheelchair 10, with support portions extending laterally. Although not shown, the back surface of the surface material 102 of the seat body 101 may be configured to be attachable to the backrest surface of a chair or wheelchair by hook-and-loop fasteners. Also, as shown in Figures 2 and 3, the seat body 101 is divided into multiple areas by a sewn portion S, so that the cushioning material 103 does not move to other areas inside the surface material 102. The manufacturer can also change the amount of cushioning material 103 according to each area. On the other hand, the areas where pockets (side pockets 111, upper pocket 121) are formed, such as the left and right side regions and the upper region, are areas where the user can independently adjust the height of the backrest seat cushion 100.

[0025] As shown in Figures 3 and 5(b), a pair of side pockets 111 are provided on the back side of the seat body 101 and are formed in a pair of left and right side regions of the backrest. They are configured to allow height adjustment of the side regions by enclosing a sheet-like height adjustment member P. Each side pocket 111 is formed by sewing its outer shell to the surface material 102 on the back side. In other words, the side pocket 111 is a bag-like body without a gusset, with a part of it open. Here, the sheet-like height adjustment member P is preferably a fabric product, a cushioning pad, or a combination thereof. In this embodiment, one or more towels (fabric products) were selected as the sheet-like height adjustment member P.

[0026] Each side pocket 111 has a lateral slit portion 112 (shown by dashed lines in Figure 3) that opens with a predetermined slit length toward the left and right outer sides of the backrest, with the backrest seat cushion 100 installed, so that the user can insert the height adjustment member P into the inside of the side pocket 111 from the left and right outer sides of the backrest while maintaining its sheet shape, even when the user is seated in the wheelchair 10. A filling portion 113 for filling the height adjustment member P is formed inside this lateral slit portion 112. This side pocket 111 extends downward (or upward) from the lateral slit portion 112. In other words, the side pocket 111 is configured so that the opening direction and the extending direction are approximately perpendicular to each other so that the filled height adjustment member P does not fall out.

[0027] Furthermore, each side pocket 111 is equipped with a tab 114 that extends from the outer surface of the side pocket 111 to the outside of the lateral slit 112 and is configured to rotate in a direction away from the back surface of the seat body 101. When the tab 114 is pulled towards the back surface, it deforms so that the lateral slit 112 expands. In particular, as shown in Figure 6, the tab 114 of the side pocket 111 is pulled towards the back surface, and a plate-shaped jig T, around which a height adjustment member P (which is a towel) is wrapped, is inserted through the lateral slit 112 to the back of the filling portion 113 of the side pocket 111. This plate-shaped jig T is a rectangular plate made of synthetic resin or metal. Then, by pulling only the plate-shaped jig T out of the side pocket 111, the height adjustment member P can be easily placed inside the side pocket 111 while maintaining its sheet shape. This operation can be performed while the user remains seated in the wheelchair 10. At the very least, the user can perform the task by adopting a seated position while leaning to the side.

[0028] Furthermore, a flap portion 115 is provided for closing the lateral slit portion 112 of each side pocket 111. The flap portion 115 extends to the outside of the lateral slit portion 112 and is integrally formed with the seat body 101. The flap portion 115 also has an adhesive portion 116 that is detachably bonded to an adhesive portion 117 on the outer surface of the outer skin of the side pocket 111. Here, the adhesive portion 116 and the adhesive portion 117 are hook-and-loop fasteners that can bond to each other. Although not shown here, the flap portion 115 may also be used to wrap around the frame of a wheelchair or chair when the adhesive portion 116 is bonded to the adhesive portion 117 to close the side pocket 111, thereby sandwiching and holding the frame between the flap portion 115 and the side pocket 111. In other words, the flap portion 115 can also function as a connecting portion.

[0029] As shown in Figure 3, the upper pocket 121 is provided on the back side of the seat body 101, formed in the upper region of the backrest, and is configured to allow height adjustment of the upper region by enclosing a sheet-like height adjustment member P. The upper pocket 121 is formed by sewing its outer shell to the surface material 102 on the back side. In other words, the upper pocket 121 is a bag-like body without a gusset, with a part of it open.

[0030] The upper pocket 121 has an upper slit portion 122 that opens upwards toward the backrest with a predetermined slit length, allowing the user to insert the height adjustment member P into the upper pocket 121 from the left and right outer sides of the backrest while maintaining its sheet-like shape, with the backrest seat cushion 100 installed. The upper pocket 121 also includes a filling portion 123 located at the back of the upper pocket 121, which is filled with the height adjustment member P, and an introduction portion 124 formed adjacent to the upper slit portion 122 for introducing the height adjustment member P into the filling portion 123. The filling portion 123 has the minimum width necessary to fill the height adjustment member P without any gaps. On the other hand, the introduction portion 124 is wider than the filling portion 123 at its upper end and narrows in width from the front side (upper end) toward the back side (lower end). A narrowed entrance 123a of the filling section 123 is defined between the filling section 123 and the introduction section 124. In other words, the width of the introduction section 124 and the slit length of the upper slit section 122 are greater than the width of the filling section 123.

[0031] The upper pocket 121 is configured to deform so that the entrance 123a of the filling area 123 expands when the outer edge of the upper slit portion 122 is pulled to the back side. In particular, as shown in Figure 7, the introduction portion 124 of the upper pocket 121 is pulled to the back side, and a plate-shaped jig T with a height adjustment member P (which is a towel) wrapped around it is inserted through the upper slit portion 122 and the entrance 123a to the back of the filling area 123 of the upper pocket 121. Then, by pulling only the plate-shaped jig T out of the upper pocket 121, the height adjustment member P can be easily placed inside the upper pocket 121 while maintaining its sheet-like shape. This operation can be performed while the user remains seated in the wheelchair 10. At the very least, the operation can be performed by the user leaning forward while seated.

[0032] Furthermore, a flap portion 125 is provided for closing the upper slit portion 122 of the upper pocket 121. The flap portion 125 extends outward (upward) of the upper slit portion 122 and is integrally formed with the sheet body 101. The flap portion 125 also has an adhesive portion 126 that is detachably bonded to the adhesive portion 127 on the outer surface of the outer skin of the upper pocket 121. Here, the adhesive portion 126 and the adhesive portion 127 are hook-and-loop fasteners that can bond to each other.

[0033] Figure 8 shows the backrest seat cushion 100 of this embodiment attached to the frame of the wheelchair 10, with height adjustment members P inserted into each pocket (111, 121). The wheelchair 10 mainly comprises main wheels 11, a seat frame 12, and a backrest frame 13. As shown in Figures 8 and 9(a) and (b), the height of the cushions in the left and right side regions and the upper region of the backrest seat cushion 100 is adjusted by introducing height adjustment members P into the pair of side pockets 111 and the upper pocket 121. At this time, since the side pockets 111 and the upper pocket 121 are formed on the back side of the seat body 101, a distance is ensured between the height adjustment members P and the user, preventing the height adjustment members P from adversely affecting the user's sitting comfort. The height is adjusted so that the left and right side regions support the back of the seated user from both sides, and the upper region supports the user's neck. As shown in Figure 8, multiple height adjustment members P may be arranged in combination for a single pocket. Such arrangements can be selected as appropriate according to the user's preference.

[0034] Next, the configuration of the seat cushion 200 used on the seat of the wheelchair 10 will be described with reference to Figures 10 to 14. Figures 10(a) and 10(b) are schematic perspective views of the seat cushion 200. Figure 11 is a plan view of the seat cushion 200. Figure 12 is a bottom view of the seat cushion 200. In Figure 12, the dotted line S indicates a sewn portion where the fabric is sewn together with thread or the like. Figures 13(a) to 13(c) are the front, side, and rear views of the seat cushion 200. Figures 14(a) to 14(d) are cross-sectional views of section CC and a partially enlarged view thereof of section 12, and cross-sectional views of section DD and a partially enlarged view thereof.

[0035] As shown in Figures 10 to 14, the seat cushion 200 for the seat surface comprises a seat body 201 that extends along the seat surface of the wheelchair 10 (see Figure 15) and has a predetermined cushioning property, a pair of left and right rear pockets 211 provided on the back side of the seat body 201 and formed in the rear region of the seat surface, and a front pocket 221 provided on the back side of the seat body 201 and formed in the front region of the seat surface.

[0036] As shown in Figure 9, the seat body 201 comprises a surface material 202 and a cushioning material 203 enclosed within the surface material 202 to provide cushioning throughout. In this embodiment, the surface side of the surface material 202 is formed of a breathable mesh fabric, and the back side is formed of a waterproof fabric. The cushioning material 203 can be selected from cotton, foamed resin material, etc. This cushioning material 203 is molded to be thicker than the cushioning material 103 for the backrest. As shown in Figure 12, the seat body 201 is divided into multiple regions by a sewn section S. The front and rear regions are height-adjustable regions, and a hook-and-loop fastener 204 for attaching to the wheelchair 10 is provided in the intermediate region between them.

[0037] As shown in Figures 12 and 14(b), the rear pocket 211 is provided on the back side of the seat body 201, formed in the rear region of the seat surface, and is configured to allow height adjustment of the rear region by enclosing a sheet-like height adjustment member P. The rear pocket 211 is formed by sewing its outer shell to the surface material 202 on the back side. In other words, the rear pocket 211 is a bag-like body without a gusset, with a part of it open.

[0038] The rear pocket 211 has a rear slit portion 212 (shown by dashed lines in Figure 12) that opens toward the rear of the seat surface with a predetermined slit length, when the seat cushion 200 is installed, so that the user can insert the height adjustment member P into the rear pocket 211 from the rear of the seat surface while maintaining the seat shape, even when the user is seated in the wheelchair 10. A filling portion 213 for filling the height adjustment member P is formed inside this rear slit portion 212. The pair of left and right rear pockets 211 are positioned close to the outer edges on both the left and right sides of the seat body 201.

[0039] Furthermore, the rear pocket 211 is equipped with a tab 214 that extends from the outer casing of the rear pocket 211 to the outside of the rear slit 212 and is rotatably configured to move away from the back surface of the seat body 101. Here, one tab 214 extending in the width direction is used for the two rear pockets 211. When this tab 214 is pulled toward the back surface, it deforms so that the rear slit 212 expands. In particular, as in Figure 6, the tab 214 of the rear pocket 211 is pulled toward the back surface, and a plate-shaped jig T, around which the height adjustment member P (a towel) is wrapped, is inserted through the rear slit 212 to the back of the filling area 213 of the rear pocket 211. Then, by pulling only the plate-shaped jig T out of the rear pocket 211, the height adjustment member P can be easily placed inside the rear pocket 211 while maintaining its sheet shape. This operation can be performed while the user remains seated in the wheelchair 10. At the very least, the user can perform the task by leaning forward while seated.

[0040] As shown in Figures 12 and 14(a), the front pocket 221 is provided on the back side of the seat body 101, formed in the front area of ​​the seat surface, and is configured to allow height adjustment of the front area by enclosing a sheet-like height adjustment member P. The front pocket 221 is formed by sewing its outer shell to the surface material 202 on the back side. In other words, the front pocket 221 is a roughly T-shaped bag without a gusset, with a part of it open.

[0041] The front pocket 221 has a front slit portion 222 that opens toward the front of the seat surface with a predetermined slit length, so that the user can insert the height adjustment member P into the front pocket 221 from the front of the seat surface while maintaining its sheet shape, with the seat cushion 200 installed. The front pocket 221 also has a filling portion 223 located at the back of the front pocket 221, which is filled with the height adjustment member P, and an introduction portion 224 formed adjacent to the front slit portion 222 for introducing the height adjustment member P into the filling portion 223. The filling portion 223 is a portion with a relatively small width to fill the height adjustment member P without any gaps. Here, the width of the filling portion 223 narrows towards the back. On the other hand, the introduction portion 224 is wider than the filling portion 223 at its upper end. An entrance 223a of the narrowed filling portion 223 is defined between the filling portion 223 and the introduction portion 224. In other words, the width of the introduction section 224 and the slit length of the front slit section 222 are greater than the width of the filling section 223.

[0042] The front pocket 221 is configured to deform so that the entrance 223a of the filling area 223 expands when the outer edge of the front slit 222 is pulled to the back side. In particular, as in Figure 7, the introduction portion 224 of the front pocket 221 is pulled to the back side, and a plate-shaped jig T with a height adjustment member P (which is a towel) wrapped around it is inserted through the front slit 222 and the entrance 223a to the back of the filling area 223 of the front pocket 221. Then, by pulling only the plate-shaped jig T out of the front pocket 221, the height adjustment member P can be easily placed inside the front pocket 221 while maintaining its sheet-like shape. This operation can be performed while the user remains seated in the wheelchair 10. At the very least, the operation can be performed by the user shifting backward while remaining seated.

[0043] Figure 15 shows the seat cushion 200 of this embodiment attached to the frame of the wheelchair 10, with height adjustment members P inserted into each pocket (111, 121). As shown in Figures 15 and 16(a) and (b), the height of the rear and front regions of the seat cushion 200 is adjusted by introducing height adjustment members P into the pair of rear pockets 211 and front pockets 221. At this time, since the rear pockets 211 and front pockets 221 are formed on the back side of the seat body 201, a distance is ensured between the height adjustment members P and the user, preventing the height adjustment members P from adversely affecting the user's sitting comfort. The height is adjusted so that the rear region supports the seated user's buttocks from both sides, and the front region supports the user's thighs from the inside. Furthermore, the seat cushion 200 is attached between the seat frame 12 of the wheelchair 10 by attaching the hook-and-loop fastener 204 to the seat surface of the wheelchair 10.

[0044] It goes without saying that both the backrest seat cushion 100 and the seat cushion 200 may be attached to a single wheelchair 10, or only one of them may be attached to the wheelchair 10. Furthermore, the seat cushion of the present invention may be attached to a chair instead of a wheelchair 10. In addition, the seat cushion of the present invention may be integrally formed with the wheelchair or chair.

[0045] The present invention is not limited to the embodiments or modifications described above, and can be implemented in various forms as long as they fall within the technical scope of the present invention. [Explanation of Symbols]

[0046] 10 Wheelchairs 11 Main wheels 12 Seat frame 13 Backrest Frame 100 Seat cushions for backrests 101 Seat Body 102 Skin material 103 Cushioning material 111 Side pockets 112 Side slit section 113 Filling site 114 Tongue 115 Flap section 116 Adhesive part 117 Glued part 121 Top pocket 122 Upper slit section 123 Filling site 123a Entrance 124 Introduction site 125 Flap section 126 Adhesive part 127 Glued part 200 Seat cushion for seat 201 Seat Body 202 Skin material 203 Cushioning material 204-sided fastener 211 Rear pocket 212 Rear slit 213 Filling site 214 Tongue 221 Front pocket 222 Front slit section 223 Filling site 223a Entrance 224 Introduction site P Height adjustment component S Sewing part T-shaped plate jig

Claims

1. A seat cushion used for the backrest or seat of a chair or wheelchair, A seat body extending along the backrest or the seat surface, The sheet body comprises one or more pockets provided in one or more areas on the back side, which enclose a sheet-like height adjustment member, thereby enabling height adjustment of the one or more areas, The seat cushion is characterized in that the pocket has a slit portion that opens outwards from the seat body with a predetermined slit length, when the seat cushion is installed as a backrest or seat, so that the user can insert the height adjustment member into the pocket while remaining seated in the chair or wheelchair.

2. The seat cushion according to claim 1, wherein the pocket is provided with a tab that extends from the outer surface of the pocket to the outside of the slit and is configured to be rotatable in a direction away from the back surface of the seat body, and the tab is deformed so as to expand the slit when pulled towards the back surface.

3. The pocket comprises a filling portion located at the back of the pocket and filled with the height adjustment member, and an introduction portion formed adjacent to the slit portion for introducing the height adjustment member into the filling portion. The seat cushion according to claim 1, characterized in that the width of the introduction portion and the length of the slit are greater than the width of the filling portion, and the edge of the slit portion on the outer skin side is pulled to the back side, causing the entrance to the filling portion to expand as it deforms.

4. The seat cushion according to claim 2 or 3, characterized in that a flap portion is provided extending to the outside of the slit portion for closing the slit portion of the pocket, and the flap portion has an adhesive portion that is detachably adhered to the adhesive portion on the outer surface of the pocket.

5. The seat cushion according to claim 4, characterized in that the flap portion is configured to hold the frame of the chair or wheelchair between the flap portion and the pocket when the adhesive portion is adhered to the portion to be adhered in order to close the pocket.

6. The seat cushion according to claim 2 or 3, wherein the seat body comprises a surface material and a cushioning material enclosed within the surface material so as to have cushioning properties throughout, and the height adjustment member is added to any pocket among the one or more pockets to form regions with different cushioning properties in the seat cushion.

7. The seat cushion according to claim 6, characterized in that the height adjustment member is a fabric product, a cushioning pad, or a combination thereof.

8. A seat cushion for use as a backrest in a chair or wheelchair, A seat body extending along the aforementioned backrest and having a predetermined cushioning property, The seat body is provided on the back side and comprises a pair of side pockets formed in the left and right side regions of the backrest, which enclose a sheet-like height adjustment member, thereby enabling height adjustment of the side regions. The pair of side pockets have lateral slits that open with a predetermined slit length toward the left and right outer sides of the backrest, with the backrest seat cushion installed, so that the user can insert the height adjustment member into the side pocket from the left and right outer sides of the backrest while remaining seated in the chair or wheelchair. Each of the aforementioned side pockets extends above or below the aforementioned side slit portion. The side pocket is provided with a tab that extends from the outer skin of the side pocket to the outside of the lateral slit and is configured to rotate in a direction away from the back surface of the seat body, and the tab is pulled towards the back surface, causing the lateral slit to deform so as to expand.

9. An upper pocket is provided on the back side of the seat body and formed in the upper region of the backrest, and further comprises an upper pocket that encloses a sheet-like height adjustment member, thereby enabling height adjustment of the side region. The upper pocket has an upper slit portion that opens upwards toward the backrest with a predetermined slit length, so that the user can insert the height adjustment member into the upper pocket from the upper side of the backrest while the user remains seated in the chair or wheelchair, when the backrest seat cushion is installed. The upper pocket comprises a filling portion located at the back of the upper pocket and filled with the height adjustment member, and an introduction portion formed adjacent to the upper slit portion for introducing the height adjustment member into the filling portion. The seat cushion for backrest according to claim 8, characterized in that the width of the introduction portion and the slit length of the upper slit portion are greater than the width of the filling portion, and the outer edge of the upper slit portion is pulled toward the back side, causing the entrance to the filling portion to expand.

10. A method for inserting a height adjustment member made of a fabric product of a predetermined thickness into a side pocket of a backrest seat cushion according to claim 8 or 9, which is installed as a backrest on a chair or wheelchair, A method characterized by pulling the tab portion of the side pocket to the back side, inserting the plate-shaped jig around which the fabric product is wrapped into the side pocket through the side slit portion, and then pulling out only the plate-shaped jig from the side pocket to position the fabric product inside the side pocket.

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