Cushion structure and bathroom chair equipped therewith

Abstract

The present invention provides a cushion structure and a bathroom chair equipped therewith, which prevents the cushion from moving or easily detaching from the main body without requiring the cushion to have a boss or fitting hole in the main body. [Solution] According to the present invention, a cushion structure is provided comprising a main body that constitutes the base of the seat or backrest of a chair, and a cushion that is detachably attached to the main body, wherein the main body has a flat support portion and a peripheral edge portion formed on the periphery of the support portion, the cushion portion has a top plate portion supported by the support portion and a peripheral wall portion that protrudes on the back surface of the top plate portion toward the direction away from the top plate portion, and one or more edge-side protrusions are formed on the peripheral edge portion of the main body, and one or more wall-side recesses are formed on the inner surface of the peripheral wall portion of the cushion portion that engage with the edge-side protrusions of the main body to which the cushion portion is attached, and a bathroom chair equipped therewith is provided.

Description

Technical Field

[0001] The present invention relates to a cushion structure and a bathroom chair provided with the same, and particularly includes a main body part of a seat part or a backrest of the chair and a cushion part detachably attached to the main body part, and a convex part on the edge side or a concave part on the edge side is provided on the peripheral edge part of the main body part, and on the peripheral wall part protruding from the back surface of the cushion part, a concave part on the wall part side or a convex part on the wall part side that engages with the convex part on the edge side or the concave part on the edge side is provided. The present invention relates to a cushion structure and a bathroom chair provided with the same.

Background Art

[0002] With the advent of an aging society, in order to assist the movements of the elderly and care recipients in the bathroom and bathtub, for example, as described in Japanese Utility Model Publication No. 52-5741 (Patent Document 1), a cushion structure in which a cushion part (cover main body) made of foamed resin is attached to a main body part such as a seat part or a backrest part is known in a bathroom chair.

[0003] Also, in the above cushion structure, the cushion part is different from the main body part such as a seat part or a backrest part generally formed of a hard material. By being interposed between the contact surface with the human buttocks, back, etc. and the main body part, it alleviates the impact from the main body part transmitted to the buttocks, back, etc., and disperses the body pressure transmitted from the main body part to the buttocks, back, etc., and is attached to the main body part to make the sitting comfort good.

[0004] However, generally, the frictional resistance between the cushion part and the main body part is small, and there are many cases where water intrudes or dirt such as scale accumulates, making the cushion part likely to slide relative to the main body part. Therefore, in the cushion part as described in Patent Document 1, when the user moves the body while applying body pressure to the cushion part, the cushion part moves together with the body and easily detaches from the main body part, which is also a problem.

[0005] Furthermore, in order to solve the above problems, a bathroom / bathtub chair has been developed in which, for example, as described in Japanese Patent Publication No. 2018-15418 (Patent Document 2), a plurality of bosses are provided on the back surface of the cushion part, and fitting holes are provided in the main body part, and the bosses are fitted into the fitting holes, thereby preventing the cushion part from easily detaching from the main body part.

[0006] However, it is known that many of the foam materials used in cushions expand with heat and contract over time, thus deforming with long-term use. Therefore, in the bathroom / bathtub chair described in Patent Document 2, measures such as making the fitting holes in the main body into elongated holes aligned with the direction in which the cushion contracts had to be taken. This resulted in a complex shape and arrangement of the fitting holes, making molding and processing time-consuming and increasing costs. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Utility Model Publication No. 52-5741 [Patent Document 2] Japanese Patent Publication No. 2018-15418 [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, the present invention aims to provide a cushion structure and a bathroom chair equipped therewith, which prevent the cushion from moving with the body or easily detaching from the main body when the user moves their body while applying body pressure to the cushion, without providing a boss portion in the cushion portion or a fitting hole (hole) in the main body portion. [Means for solving the problem]

[0009] The inventors of this invention have conducted extensive research on the structure of the cushion portion and the structure of the main body portion of the seat and backrest of the chair to which the cushion portion is attached. As a result, they have discovered that by providing a peripheral wall portion on the edge of the back surface of the cushion portion and engaging the peripheral wall portion with the peripheral edge portion of the main body portion, the above-mentioned problems can be solved without using bosses or fitting holes to fix the flat (back) portion of the cushion portion and the flat (front) portion of the main body portion together. This led to the completion of the present invention.

[0010] In other words, the present invention provides a cushion structure comprising a main body portion constituting the base of the seat or backrest of a chair, and a cushion portion detachably attached to the main body portion, wherein the main body portion has a flat support portion and a peripheral edge portion formed on the periphery of the support portion, the cushion portion has a top plate portion supported by the support portion and a peripheral wall portion projecting toward the direction away from the top plate portion on the back surface of the top plate portion, and one or more edge-side protrusions are formed on the peripheral edge portion of the main body portion, and one or more wall-side recesses are formed on the inner surface of the peripheral wall portion of the cushion portion that engage with the edge-side protrusions of the main body portion to which the cushion portion is attached, or one or more edge-side recesses are formed on the peripheral edge portion of the main body portion, and one or more wall-side protrusions are formed on the inner surface of the peripheral wall portion of the cushion portion that engage with the edge-side recesses of the main body portion to which the cushion portion is attached, and a bathroom chair equipped therewith is provided.

[0011] In the cushion structure of the present invention, the peripheral edge of the main body is provided with an edge-side protrusion or edge-side recess, and the peripheral wall of the cushion is provided with a wall-side recess that engages with the edge-side protrusion of the main body, or a wall-side protrusion that engages with the edge-side recess. As a result, the cushion is strongly restrained by the engagement between the edge-side protrusion and the wall-side recess, or the engagement between the edge-side recess and the wall-side protrusion, preventing the cushion from moving with the user's body or easily detaching from the main body.

[0012] In the cushion structure of the present invention, a gap may be formed between the peripheral wall portion of the cushion portion and the peripheral edge portion of the main body portion to which the cushion portion is attached. Alternatively, a gap may be formed between the wall-side recess of the cushion portion and the edge-side protrusion of the main body portion to which the cushion portion is attached, or between the wall-side protrusion of the cushion portion and the edge-side recess of the main body portion to which the cushion portion is attached.

[0013] In the cushion structure of the present invention, by providing a gap between the peripheral wall portion and the peripheral edge portion, between the wall-side recess and the edge-side protrusion, and between the wall-side protrusion and the edge-side recess, the cushion portion can absorb deformations without detaching even if it undergoes thermal expansion or contraction due to changes over time. For this reason, resin materials such as EVA exhibiting the above-described properties can be suitably used as the material for the cushion portion.

[0014] In the cushion structure of the present invention, in order to make the engagement between the convex portion and the concave portion or the engagement between the concave portion and the convex portion more reliable, the edge-side convex portion may be made such that the width dimension of the tip portion is wider than the width dimension of the base portion when viewed from above, and the wall-side concave portion may be made such that the width dimension of the opening is narrower than the width dimension of the bottom portion when viewed from above, or the edge-side concave portion may be made such that the width dimension of the opening is narrower than the width dimension of the bottom portion when viewed from above, and the wall-side convex portion may be made such that the width dimension of the tip portion is wider than the width dimension of the base portion when viewed from above, and the structure may be fitted together like a jigsaw puzzle.

[0015] In the cushion structure of the present invention, the support portion of the main body and the top plate portion of the cushion are formed in a substantially rectangular shape in plan view, and the edge-side protrusions are formed on each side of the peripheral edge of the support portion which is formed in a substantially rectangular shape, and the wall-side recesses are formed on each side of the peripheral wall portion which is formed in a substantially rectangular shape, or the edge-side recesses are formed on each side of the peripheral edge of the support portion which is formed in a substantially rectangular shape, and the wall-side protrusions are formed on each side of the peripheral wall portion which is formed in a substantially rectangular shape.

[0016] By making the main body and cushion parts roughly rectangular in shape, the corners of the main body part function as protrusions, and the corners of the peripheral walls of the cushion part function as recesses. This strengthens the engagement and restraint between the main body and cushion part through contact between the corners. Furthermore, by providing protrusions and recesses, or recesses and protrusions, on each side of the roughly rectangular main body part and each side of the peripheral walls of the cushion part, the main body and cushion part can be efficiently engaged and restrained with a small number of protrusions and recesses, in conjunction with the substantial engagement effect between the corners mentioned above.

[0017] In the cushion structure of the present invention, in order to prevent the cushion from easily detaching from the main body, a folded portion extending inward along the back surface of the top plate of the main body to which the cushion is attached may be provided at the tip of the peripheral wall portion of the cushion. Furthermore, in order to enhance the prevention of rotation of the cushion relative to the main body by utilizing the folded portion, a first peripheral portion formed adjacent to the surface of the support portion in a vertical cross-section, and a second peripheral portion formed adjacent to the back surface of the support portion and having a narrower width than the first peripheral portion may be provided on the peripheral edge of the main body in a stepped manner, and the tip of the folded portion of the attached cushion may be positioned opposite the second peripheral portion.

[0018] Furthermore, as described above, if a first peripheral portion and a second peripheral portion are provided on the peripheral edge of the main body, and a first peripheral wall portion and a second peripheral wall portion formed at the tip of the folded portion are provided on the peripheral wall portion of the cushion, the edge-side convex portion and wall-side concave portion, or the edge-side concave portion and wall-side convex portion may be provided on the first peripheral portion and the first peripheral wall portion, or on the second peripheral portion and the second peripheral wall portion, or on both the first peripheral portion and the first peripheral wall portion, and the second peripheral portion and the second peripheral wall portion.

[0019] Even when the peripheral part of the main body part and the peripheral wall part of the cushion part are formed in two steps in a stepped shape as described above, similar to the case where they are formed in one step, the cushion part is strongly constrained by the engagement of the convex part on the edge side and the concave part on the wall part, or the engagement of the concave part on the edge side and the convex part on the wall part, and it is possible to prevent the cushion part from moving together with the user's body or easily detaching from the main body part.

Effect of the Invention

[0020] Thus, according to the present invention, in a cushion structure including a main body part constituting a seat part or a backrest base of a chair and a cushion part detachably attached to the main body part, the main body part has a flat support part and a peripheral part formed at the periphery of the support part, the cushion part has a top plate part supported by the support part and a peripheral wall part protruding in a direction away from the top plate part on the back surface of the top plate part, and one or more convex parts on the edge side are formed at the peripheral part of the main body part, and one or more concave parts on the wall side that engage with the convex parts on the edge side of the main body part to which the cushion part is attached are formed on the inner surface of the peripheral wall part of the cushion part, or one or more concave parts on the edge side are formed at the peripheral part of the main body part, and one or more convex parts on the wall side that engage with the concave parts on the edge side of the main body part to which the cushion part is attached are formed on the inner surface of the peripheral wall part of the cushion part. There is provided a cushion structure characterized by this and a bathroom chair including the same.

[0021] According to the cushion structure of the present invention and the bathroom chair including the same, without providing a boss part or the like in the cushion part and without providing a fitting hole (hole) that fits with the boss part or the like in the main body part of the seat part or the backrest part of the chair, when the user moves the body while applying body pressure to the cushion part, it is possible to prevent the cushion part from moving together with the body or easily detaching from the main body part.

Brief Description of the Drawings

[0022] [Figure 1] It is a perspective view seen from above of a cushion structure according to an embodiment of the present invention and a bathroom chair including the same. [Figure 2]It is a perspective view of the bathroom chair shown in FIG. 1 as seen from below. [Figure 3] (a) is a plan view of the seat cushion structure of the bathroom chair shown in FIG. 1, (b) is a cross-sectional view taken along the line A-A of the seat cushion structure of (a), and (c) is a cross-sectional view taken along the line B-B of the seat cushion structure of (a). [Figure 4A] It is a perspective view of the seat main body portion having an edge side convex portion formed at the peripheral edge portion among the seat cushion structures according to the first embodiment, as seen from above. [Figure 4B] It is a perspective view of the seat cushion portion having a wall side concave portion formed at the peripheral wall portion among the seat cushion structures according to the first embodiment, as seen from below. [Figure 5A] It is a perspective view of the seat main body portion having an edge side concave portion formed at the peripheral edge portion among the seat cushion structures according to the second embodiment, as seen from above. [Figure 5B] It is a perspective view of the seat cushion portion having a wall side convex portion formed at the peripheral wall portion among the seat cushion structures according to the second embodiment, as seen from below. [Figure 6] It is a plan view schematically showing the engagement state between the edge side convex portion of the main body portion and the wall side concave portion of the cushion portion, and between the edge side concave portion of the main body portion and the wall side convex portion of the cushion portion. [Figure 7] It is a cross-sectional view partially showing the vicinity of the folded-back portion of the cushion structure provided with a folded-back portion on the peripheral wall portion of the cushion portion.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, a cushion structure according to an embodiment of the present invention and a bathroom chair provided with the same will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of the present invention. <0​​​Figure 1 shows a top-down perspective view of a seat cushion structure 2, a back cushion structure 5, and a bathroom chair 1 equipped therewith, according to one embodiment of the present invention, while Figure 2 shows a bottom-up perspective view of the bathroom chair 1 shown in Figure 1.

[0025] The seat cushion structure 2 and back cushion structure 5 of this embodiment are suitably used in a bathroom chair 1 to assist the movements of the elderly and those requiring care in humid bathrooms and bathtubs. Therefore, this embodiment mainly describes the seat cushion structure 2 used in the bathroom chair 1, but the usage of the cushion structures 2 and 5 of the present invention is not limited to this.

[0026] As shown in Figures 1 and 2, the bathroom chair 1 of this embodiment consists of a seat cushion structure 2, a back cushion structure 5, armrests 8, and legs 9. The legs 9 include a pair of front leg frames 90 that extend upward from below and support the back of the back cushion structure 5, and a pair of rear leg frames 91 that are rotatably connected to the front leg frames 90 and extend upward from below to rotatably support the back of the seat cushion structure 2. An armrest 8 is also rotatably attached to each of the pair of front leg frames 90.

[0027] The front leg frame 90 and the rear leg frame 91 are both formed from hollow metal pipes, but the material is not limited to this. Sleeve-shaped movable front leg parts 900 and 910 are slidably mounted on the outer circumference of the front leg portion of the front leg frame 90 and the outer circumference of the rear leg portion of the rear leg frame 91, respectively, and are configured to allow adjustment of the length of the legs of the front leg frame 90 and the rear leg frame 91, in other words, the height of the seat cushion structure 2. In addition, a resin cap 911 is attached to the tip of the movable rear leg part 910 to prevent scratching the floor and slipping, and a resin cap 901 with a roller is attached to the movable front leg part 900, which has a contact surface and rollers to prevent scratching the floor and slipping, as well as to facilitate opening and closing the legs of the bathroom chair 1.

[0028] By adopting the above configuration, the bathroom chair 1 of this embodiment can open and close the front leg frame 90 and the rear leg frame 91 between an open leg state where they are spaced apart from each other and a closed leg state where they are close together. In conjunction with the movement of the front leg frame 90 and the rear leg frame 91, the seat cushion structure 2 can rotate between a substantially horizontal unfolded state and a substantially vertical folded state. It should be noted that the bathroom chair 1 of this embodiment is merely an example, and the seat cushion structure 2 may also include a seat main body 3 and a seat cushion 4 that can be detachably attached to the seat main body 3, even if it does not have a backrest cushion structure 5, or a bath chair that is normally used by being immersed in a bathtub.

[0029] <Cushion structure> Figure 3(a) shows a plan view of the seat cushion structure 2 of the bathroom chair 1 shown in Figure 1, (b) shows a cross-sectional view AA of the seat cushion structure 2 of (a), and (c) shows a cross-sectional view BB of the seat cushion structure 2 of (a).

[0030] As shown in Figure 3, the seat cushion structure 2 used in the bathroom chair 1 of this embodiment consists of a seat body 3 and a seat cushion 4 that is detachably attached to the surface of the seat body 3. The backrest cushion structure 5 used in the bathroom chair 1 of this embodiment consists of a backrest body 6 and a backrest cushion 7 that is detachably attached to the surface of the backrest body 6 (Figures 1 and 2).

[0031] <First Embodiment> Figure 3(a) shows a plan view of the seat cushion structure 2 and its seat cushion portion 4 of the bathroom chair 1 shown in Figure 1. Figure 4A shows a top-down perspective view of the seat main body portion 3 of the seat cushion structure 2 according to the first embodiment, in which an edge-side protrusion 32 is formed on the peripheral edge portion 31. Figure 4B shows a bottom-up perspective view of the seat cushion portion 4, which is attached to the seat main body portion 3 shown in Figure 4A, in which a wall-side recess 42 is formed on the peripheral wall portion 41.

[0032] In the seat cushion structure 2, the seat body 3 is a hollow component formed from a hard resin such as PE (polyethylene) or PP (polypropylene), taking into consideration water resistance and chemical resistance, but the material is not limited to these.

[0033] As shown in Figure 4A, the seat body 3 has a support portion 30 with a flat surface and a peripheral portion 31 formed around the periphery of the support portion 30. Although not shown, the surface of the seat body 3 (support portion 30) may also have a "V" shaped drainage groove aligned to communicate with the drainage holes provided in the seat cushion portion 4 when the seat cushion portion 4 is attached, and drainage holes that communicate with the drainage groove and penetrate the seat body 3 may be provided at both ends. Furthermore, the rear of the seat body 3 (the side closer to the back cushion structure 5) may be provided with a roughly square-shaped handle for gripping when carrying the bathroom chair 1.

[0034] In this invention, "flat" on the surface of the support portion 30 does not mean a perfectly flat surface in the strict sense. For the seat cushion structure 2, it is sufficient if it is flat enough to distribute the body pressure transmitted to the user's buttocks and support it across a surface. For the backrest cushion structure 5, it is sufficient if it is flat enough to distribute the body pressure transmitted to the user's back and support it across a surface. Therefore, "flat" means that as long as it is flat as described above, it may be curved overall, form a curved surface such as a mortar, or have localized irregularities or openings.

[0035] The seat cushion portion 4 is made from EVA resin (ethylene vinyl acetate copolymer resin) to provide high flexibility and water resistance, but the material is not limited to this. Other materials that can be used for the seat cushion portion 4 include PP (polypropylene) resin, PE (polyethylene) resin, AS (acrylonitrile / styrene) resin, or urethane resin, which have elasticity imparted by foaming conditions and compounding composition.

[0036] As shown in Figures 3 and 4B, the seat cushion portion 4 has a top plate portion 40 supported by a support portion 30 of the seat body portion 3, and a peripheral wall portion 41 that protrudes from the back surface 400 of the top plate portion 40 toward the direction away from the top plate portion 40. Although not shown, the seat cushion portion 4 (top plate portion 40) may also be provided with a substantially rectangular handle recess at a position aligned with the handle portion provided on the seat body portion 3. Furthermore, the rear part of the seat body portion 3 (the side closer to the back cushion structure 5) may be provided with drainage holes to allow water accumulated on the surface of the top plate portion 40 to escape.

[0037] In the first embodiment, the seat cushion portion 4 is attached so as to cover the seat body portion 3 (Figure 1). Therefore, the top plate portion 40 of the seat cushion portion 4 is in close contact with the support portion 30 of the seat body portion 3, and the peripheral wall portion 41 of the top plate portion 40 is positioned to cover the peripheral edge portion 31 of the support portion 30 (Figure 3). Thus, the peripheral wall portion 41 effectively prevents water and other liquids from entering between the seat cushion portion 4 and the seat body portion 3. Note that the peripheral wall portion 41 functions to prevent water intrusion and displacement of the seat cushion portion 4, which will be described later, so it is not necessary for it to be continuously provided around the entire edge of the top plate portion 40 as long as these functions are not lost.

[0038] In the first embodiment, the support portion 30 of the seat body portion 3 is formed in a substantially rectangular shape in plan view, and edge-side protrusions 32 are formed at the four corners of the peripheral edge portion 31. The top plate portion 40 of the seat cushion portion 4 is also formed in a substantially rectangular shape in plan view so as to be substantially similar in shape to the seat body portion 3 on which it is attached, and wall-side recesses 42 are formed at the four corners of the inner surface 412 of the peripheral wall portion 41, which engage with the edge-side protrusions 32 of the seat body portion 3. Note that the edge-side protrusions 32 and wall-side recesses 42 do not necessarily have to be provided at the corners of the substantially rectangular support portion 30 or top plate portion 40, but may be formed on each side between the corners of the peripheral edge portion 31 or peripheral wall portion 41.

[0039] In this invention, the term "approximately quadrilateral" is a concept that includes not only quadrilaterals whose outlines are composed solely of straight lines, but also quadrilaterals with rounded corners, and quadrilaterals that are composed of four sides made of straight lines or gently curved lines, and four corner curves having a smaller radius of curvature than those straight lines or curves, and can be recognized as a rounded quadrilateral overall.

[0040] The edge-side protrusions 32 and wall-side recesses 42 engage with each other to prevent the seat cushion portion 4 from shifting away from the seat body portion 3. Therefore, the number of edge-side protrusions 32 and wall-side recesses 42 may be one or two or more, respectively. Although not shown in the figures, the edge-side protrusions 32 may be formed continuously in a comb-like pattern, with the edge-side protrusions 32 and edge-side recesses 33 repeating. Furthermore, the wall-side recesses 42 that engage with the edge-side protrusions 32 may also be formed continuously in a comb-like pattern, with the wall-side recesses 42 and wall-side protrusions 43 repeating.

[0041] Furthermore, since it is sufficient for the edge-side protrusions 32 and the wall-side recesses 42 to engage with each other, the number of edge-side protrusions 32 and the number of wall-side recesses 42 do not necessarily have to be the same. If there are two or more wall-side recesses 42, it is sufficient for there to be one or more edge-side protrusions 32, and the number of edge-side protrusions 32 may be less than the number of wall-side recesses 42.

[0042] <Second Embodiment> Figure 5A shows a top-down perspective view of the seat cushion structure 2 according to the second embodiment, specifically the seat body 3, which has an edge-side recess 33 formed on its peripheral edge 31. Figure 5B shows a bottom-up perspective view of the seat cushion 4, which is attached to the seat body 3 shown in Figure 5A, and has a wall-side protrusion 43 formed on its peripheral wall 41.

[0043] In the second embodiment, the support portion 30 of the seat body portion 3 is formed in a substantially rectangular shape in plan view, and edge-side recesses 33 are formed on each side between the corners of the peripheral edge portion 31. The top plate portion 40 of the seat cushion portion 4 is also formed in a substantially rectangular shape in plan view so as to be substantially similar in shape to the seat body portion 3 on which it is attached, and wall-side protrusions 43 are formed on each side between the corners of the inner surface 412 of the peripheral wall portion 41 that engage with the edge-side recesses 33 of the seat body portion 3. Note that the edge-side recesses 33 and wall-side protrusions 43 do not necessarily have to be provided on each side between the corners of the peripheral edge portion 31 of the support portion 30 or the peripheral wall portion 41 of the top plate portion 40, which are formed in a substantially rectangular shape, and may be formed on the corners of the peripheral edge portion 31 or the peripheral wall portion 41.

[0044] In the second embodiment, the edge-side recesses 33 and wall-side protrusions 43 engage with each other to prevent the seat cushion portion 4 from shifting away from the seat body portion 3. Therefore, the number of edge-side recesses 33 and wall-side protrusions 43 may be one or two or more, respectively. Although not shown, the edge-side recesses 33 may be formed continuously in a comb-like pattern, with the edge-side recesses 33 and edge-side protrusions 32 repeating. Furthermore, the wall-side protrusions 43 that engage with the edge-side recesses 33 may also be formed continuously in a comb-like pattern, with the wall-side protrusions 43 and wall-side recesses 42 repeating.

[0045] Furthermore, since it is sufficient for the edge-side recesses 33 and the wall-side protrusions 43 to engage with each other, the number of edge-side recesses 33 and the number of wall-side protrusions 43 do not necessarily have to be the same. If there are two or more edge-side recesses 33, it is sufficient for there to be one or more wall-side protrusions 43, and the number of wall-side protrusions 43 may even be less than the number of edge-side recesses 33.

[0046] In the seat cushion structure 2 of the second embodiment, the materials of the seat body 3 and seat cushion 4, the overall shape, and the configuration and effects for achieving ancillary functions such as water drainage are the same as those of the seat cushion structure 2 of the first embodiment described above, so a detailed explanation is omitted here.

[0047] <Common to Embodiments 1 and 2> As described above, in the seat cushion structure 2 of the first and second embodiments, the peripheral edge 31 of the seat body 3 is provided with an edge-side protrusion 32 or an edge-side recess 33, and the inner surface 412 of the peripheral wall 41 of the seat cushion 4 is provided with a wall-side recess 42 that engages with the edge-side protrusion 32 of the seat body 3, or a wall-side protrusion 43 that engages with the edge-side recess 33. Therefore, the seat cushion 4 is strongly restrained by the engagement of the edge-side protrusion 32 and the wall-side recess 42, or the engagement of the edge-side recess 33 and the wall-side protrusion 43, preventing the seat cushion 4 from moving with the user's body or easily detaching from the seat body 3.

[0048] Furthermore, in the seat cushion structure 2 of the first and second embodiments, if the shape of the seat body 3 and the seat cushion 4 is made substantially rectangular, the corners of the seat body 3 function as protrusions, and the corners of the peripheral wall 41 of the seat cushion 4 function as recesses. As a result, the engagement and restraint between the seat body 3 and the seat cushion 4 are strengthened by the contact between the corners. Moreover, by providing edge-side recesses 33 and wall-side protrusions 43, or edge-side protrusions 32 and wall-side recesses 42, on each side of the substantially rectangular seat body 3 and each side of the peripheral wall 41 of the seat cushion 4, combined with the substantial engagement effect between the corners, the seat body 3 and the seat cushion 4 can be efficiently engaged and restrained by forming a small number of edge-side recesses 33 and wall-side protrusions 43, or edge-side protrusions 32 and wall-side recesses 42.

[0049] Figure 8 shows a schematic plan view illustrating, as an example common to the first and second embodiments, the engagement state between the edge-side protrusion 32 of the seat or backrest main body 3,6 and the wall-side recess 42 of the seat or backrest cushion 4,7, or the engagement state between the edge-side recess 33 of the seat or backrest main body 3,6 and the wall-side protrusion 43 of the seat or backrest cushion 4,7.

[0050] The shape of the edge-side protrusion 32 is not particularly limited as long as it engages with the wall-side recess 42, and may be rectangular, arc-shaped, or otherwise. For example, the shape of the edge-side protrusion 32 may have a width dimension a near the tip in a plan view that is wider than (Figure 8) or narrower than or the same as the width dimension b of the base or neck portion formed closer to the root than the tip. In this case, it is preferable that the shape of the wall-side recess 42 that engages with the edge-side protrusion 32 has a width dimension c near the opening in a plan view that is narrower than (Figure 8) or wider than or the same as the width dimension d near the bottom portion formed further back than the opening.

[0051] Furthermore, the shape of the edge-side recess 33 is similar to that of the wall-side recess 42; in a plan view, the width dimension c near the opening may be narrower (Figure 8), wider, or the same as the width dimension d near the bottom formed at a position further back than the opening. In this case, the shape of the wall-side protrusion 43 that engages with the edge-side recess 33 is also similar to that of the edge-side protrusion 32; in a plan view, it is preferable that the width dimension a near the tip is wider (Figure 8), narrower, or the same as the width dimension b of the base or neck formed at a position closer to the root than the tip.

[0052] In the first and second embodiments, as shown in Figure 8, the width of the tip of the edge-side projection 32 is made wider than the width of the base, and the width of the opening of the wall-side recess 42 is made narrower than the width of the bottom, or the width of the opening of the edge-side recess 33 is made narrower than the width of the bottom, and the width of the tip of the wall-side projection 43 is made wider than the width of the base, thereby making the engagement between the edge-side projection 32 and the wall-side recess 42 or between the edge-side recess 33 and the wall-side projection 43 more secure.

[0053] In the first and second embodiments, a gap 45 may be formed between the peripheral wall portion 41 of the seat cushion portion 4 and the peripheral edge portion 31 of the seat body portion 3 to which the seat cushion portion 4 is attached (see Figure 3). Alternatively, a gap 420 may be formed between the wall-side recess 42 of the seat cushion portion 4 and the edge-side protrusion 32 of the seat body portion 3 to which the seat cushion portion 4 is attached, or a gap 430 may be formed between the wall-side protrusion 43 of the seat cushion portion 4 and the edge-side recess 33 of the seat body portion 3 to which the seat cushion portion 4 is attached (see Figure 8).

[0054] In the seat cushion structure 2 of the first and second embodiments, gaps 45, 420, and 430 are provided between the peripheral wall portion 41 and the peripheral edge portion 31, between the wall-side recess 42 and the edge-side protrusion 32, and between the wall-side protrusion 43 and the edge-side recess 33. This allows the seat cushion portion 4 to absorb deformations without detaching, even if it undergoes thermal expansion or contraction due to changes over time. For this reason, resin materials such as EVA exhibiting the above-described properties can be suitably used as the material for the seat cushion portion 4.

[0055] The gaps 420 and 430 are formed between the wall-side recess 42 and the edge-side protrusion 32, or between the wall-side protrusion 43 and the edge-side recess 33. There are no particular limitations on their position, such as between the tip and the bottom, or between the sides. However, it is preferable that the gaps are formed along a virtual displacement line extending radially from the center of the top plate portion 40, such as the gap between the tip and the bottom, so as to absorb deformation along the said displacement line.

[0056] Figure 9 shows a partial cross-sectional view of the area near the folded portion 44 of a seat cushion structure 2, which is provided with a folded portion 44 on the peripheral wall portion 41 of the seat cushion portion 4, as an example common to the first and second embodiments.

[0057] As shown in Figure 9, in the seat cushion structure 2 of the first and second embodiments, in order to prevent the seat cushion portion 4 from easily detaching from the seat body portion 3, a folded portion 44 extending inward along the back surface 400 of the top plate portion 40 of the seat body portion 3 to which the seat cushion portion 4 is attached may be provided at the tip of the peripheral wall portion 41 of the seat cushion portion 4. Furthermore, in order to enhance the prevention of rotation of the seat cushion portion 4 relative to the seat body portion 3 by utilizing the folded portion 44, the peripheral edge portion 31 of the seat body portion 3 may be provided in a stepped manner with a first peripheral edge portion 310 formed adjacent to the surface of the support portion 30 in a vertical cross-section, and a second peripheral edge portion 311 formed adjacent to the back surface of the support portion 30 and having a narrower width than the first peripheral edge portion 310, and the tip of the folded portion 44 of the attached seat cushion portion 4 may be positioned opposite the second peripheral edge portion 311.

[0058] Furthermore, as shown in Figure 9, if the seat body portion 3 is provided with a first peripheral portion 310 and a second peripheral portion 311 on its peripheral edge portion 31, and the seat cushion portion 4 is provided with a first peripheral wall portion 410 and a second peripheral wall portion 411 formed at the tip of the folded portion 44 on its peripheral wall portion 41, then the edge-side protrusion 32 and wall-side recess 42, or the edge-side recess 33 and wall-side protrusion 43 may be provided on the first peripheral portion 310 and the first peripheral wall portion 410, or on the second peripheral portion 311 and the second peripheral wall portion 411, or on both the first peripheral portion 310 and the first peripheral wall portion 410, and the second peripheral portion 311 and the second peripheral wall portion 411.

[0059] Furthermore, the folded portion 44 does not necessarily have to be formed continuously around the entire circumference of the peripheral wall portion 41 of the seat cushion portion 4, but may be formed discontinuously with slits or gaps in between.

[0060] As shown in Figure 9, even when the peripheral edge 31 of the seat body 3 and the peripheral wall 41 of the seat cushion 4 are formed in a stepped manner in two stages, the seat cushion 4 is strongly restrained by the engagement between the edge-side protrusion 32 and the wall-side recess 42, or the engagement between the edge-side recess 33 and the wall-side protrusion 43, just as in the case where it is formed in one stage. This prevents the seat cushion 4 from moving with the user's body or easily detaching from the seat body 3.

[0061] <Backrest cushion structure> The cushion structure of the present invention and the bathroom chair equipped therewith can also be configured as a backrest cushion structure 5 and a bathroom chair 1 equipped therewith, as described above. In this case, the backrest cushion structure 5 used in the bathroom chair 1 of this embodiment consists of a backrest body 6 and a backrest cushion 7 that is detachably attached to the surface of the backrest body 6, as shown in Figures 1 and 2.

[0062] In addition, in the backrest cushion structure 5 of this embodiment, the configuration of the edge-side protrusions 32 or edge-side recesses 33 formed on the backrest body 6, the wall-side recesses 42 or wall-side protrusions 43 formed on the backrest cushion 7 that engage with them, the materials of the backrest body 6 and the backrest cushion 7, and their effects are the same as those of the seat cushion structure 2 of the first and second embodiments described above, so a detailed explanation is omitted here.

[0063] In the back cushion structure 5 of this embodiment, similar to the seat cushion structure 2 of the first and second embodiments, the back cushion portion 7 is strongly restrained by the engagement between the edge-side protrusion 32 and the wall-side recess 42, or the engagement between the edge-side recess 33 and the wall-side protrusion 43, thereby preventing the back cushion portion 7 from shifting and detaching from the back cushion body portion 6. [Explanation of Symbols]

[0064] 1...bathroom chair 2. Seat cushion structure 3. Seat body 30...Support part 31. Peripheral area 310...First peripheral part 311...Second peripheral area 32...Edge side convex part 33. Edge side recess 4. Seat cushion 40····Top panel 400...Back side 41...Peripheral wall part 410...First peripheral wall section 411...Second peripheral wall section 412...Inner 42.. Wall-side recess 420...gap 43...Wall side convex part 430...gap 44..Folded section 45...gap 5. Backrest cushion structure 6. Backrest main body 7. Backrest cushion section 8. Armrest 9... Legs 90····Front leg frame 900... Front leg movable part 901... Resin cap with roller 91...Rear leg frame 910... Rear leg movable part 911... Resin cap a·····Width of the tip b...Width of the base c·····Width of the opening d·····Bottom width dimension

Claims

1. The main body that forms the base of the seat or backrest of the chair, A cushion structure comprising a cushion portion that can be detachably attached to the main body, The main body is, A flat support section, It has a peripheral edge formed on the periphery of the support portion, The aforementioned cushion part is The top plate portion is supported by the aforementioned support portion, The back surface of the top plate portion has a peripheral wall portion that protrudes in a direction away from the top plate portion, and One or more edge-side protrusions are formed on the peripheral edge of the main body portion. The inner surface of the peripheral wall portion of the cushion portion has one or more wall-side recesses that engage with the edge-side protrusions of the main body portion to which the cushion portion is attached, or One or more edge-side recesses are formed on the peripheral edge of the main body portion. A cushion structure characterized in that one or more wall-side protrusions are formed on the inner surface of the peripheral wall portion of the cushion portion, which engage with the edge-side recess of the main body portion to which the cushion portion is attached.

2. The cushion structure according to claim 1, characterized in that a gap is formed between the peripheral wall portion and the peripheral edge portion of the main body portion to which the cushion portion is attached.

3. The cushion structure according to claim 1, characterized in that a gap is formed between the wall-side recess and the edge-side protrusion of the main body to which the cushion portion is attached, or between the wall-side protrusion and the edge-side recess of the main body to which the cushion portion is attached.

4. In a plan view, the width dimension of the tip of the edge-side protrusion is wider than the width dimension of the base, and in a plan view, the width dimension of the opening of the wall-side recess is narrower than the width dimension of the bottom, or The cushion structure according to claim 1, characterized in that the recess on the edge side has a width dimension of the opening that is narrower than the width dimension of the bottom in a plan view, and the protrusion on the wall side has a width dimension of the tip that is wider than the width dimension of the base in a plan view.

5. The support portion and the top plate portion are formed in a substantially rectangular shape in plan view. The aforementioned edge-side protrusions are formed on each side of the peripheral edge of the support portion, which is formed in a substantially square shape. The wall-side recesses are formed on each side of the peripheral wall portion which is formed in a substantially rectangular shape, or The aforementioned edge-side recesses are formed on each side of the peripheral edge of the support portion, which is formed in a substantially rectangular shape. The cushion structure is characterized in that the wall-side protrusions are formed on each side of the peripheral wall which is formed in a substantially rectangular shape.

6. The cushion structure according to claim 1, characterized in that the peripheral wall portion has a folded portion at its tip that extends inward along the back surface of the top plate portion of the main body portion to which the cushion portion is attached.

7. The peripheral portion has, in a longitudinal cross-section, a first peripheral portion formed adjacent to the surface of the support portion, and a second peripheral portion formed adjacent to the back surface of the support portion, which has a narrower width than the first peripheral portion, and The cushion structure 6 is characterized in that the second peripheral portion is arranged to face the tip of the folded portion of the attached cushion portion.

8. The peripheral portion has, in a longitudinal cross-section, a first peripheral portion formed adjacent to the surface of the support portion, and a second peripheral portion formed adjacent to the back surface of the support portion, which has a narrower width than the first peripheral portion. The peripheral wall portion has, in a longitudinal cross-section, a first peripheral wall portion and a second peripheral wall portion formed at the tip of the folded portion, and The edge-side protrusion is formed on the first peripheral edge and / or the second peripheral edge, The wall-side recess is formed on the inner surface of the first peripheral wall and / or the inner surface of the second peripheral wall, or The edge-side recess is formed on the first peripheral edge and / or the second peripheral edge, The cushion structure 6 is characterized in that the wall-side protrusion is formed on the inner surface of the first peripheral wall and / or the inner surface of the second peripheral wall.

9. The cushion structure according to claim 1, characterized in that the cushion portion is formed from EVA resin.

10. A bathroom chair characterized by comprising a cushion structure according to any one of claims 1 to 9.

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