chair

Abstract

[Problem] With regard to conventional chairs, users want chairs which can be easily carried and used under various circumstances. [Solution] This chair has a main body (10) which has a seat surface (16) and can be disposed on a disposition surface, and a backrest (50) which is rotatably attached to the main body (10), wherein: in an accommodation state in which the backrest (50) covers an upper side of the seat surface (16), the chair is configured to have a box shape having one or more surfaces which are positioned so as to cover both the lateral sides and the upper side of the seat surface (16); and the one or more surfaces are constituted by an outer surface section (51) of the main body (10) and an outer surface section (51) of the backrest (50). This chair (1) can be easily carried to various places.

Description

[Technical Field]

[0001] The present invention relates to a portable chair. [Background technology]

[0002] Various portable chairs are known. For example, Patent Document 1 below describes a table chair that has a frame made of pipes and the like and a seat cover attached to the frame. This table chair is configured to be foldable and portable.

[0003] Some chairs have a seating position maintaining function that is configured to maintain the posture (seated position) of a seated user (see, for example, Patent Document 2 below). Such chairs can be used for users who have difficulty maintaining a seated position due to functional impairments in some parts of their body. The function of such chairs makes it easier for users to maintain a seated position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-150104 [Patent Document 2] Japanese Utility Model Application Publication No. 6-427 Summary of the Invention [Problem to be solved by the invention]

[0005] The table chair described in the above-mentioned Patent Document 1 can be attached to a structure such as a table and used. However, chairs are not limited to such situations. In other words, users desire chairs that can be easily carried and used in various situations.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a chair that is easily portable. [Means for solving the problem]

[0007] The chair of this first invention has a seat, a main body that can be placed on a placement surface, and a backrest that is rotatably attached to the main body, and is configured to be box-shaped with one or more surfaces that are positioned to cover both sides and the top of the seat when in a stored state with the backrest covering the top of the seat, and the one or more surfaces are configured by the outer surface of the main body and the outer surface of the backrest.

[0008] This configuration allows the user to easily carry the chair.

[0009] In addition, the chair of the second invention is different from the chair of the first invention in that it further comprises a support member attached to the inside of the backrest, on the side where a seated user is positioned, and capable of supporting the upper body of the seated user, and the support member is attached so as to face the seat surface when in the stored state.

[0010] With this configuration, the chair capable of supporting the user's seated position can be easily carried around.

[0011] Furthermore, the chair of the third invention differs from the chair of the second invention in that the main body has a recess configured to accommodate the buttocks of a seated user, the bottom of the recess is configured to form the seat surface, and the recess is configured so that the support member fits into the recess when in the stored state.

[0012] This configuration allows the chair to be made smaller when stored.

[0013] Furthermore, a chair according to a fourth aspect of the present invention is a chair according to the second or third aspect of the present invention, wherein the support member is configured to be slidable in a predetermined direction relative to the backrest.

[0014] With this configuration, the chair can support the upper body of the user according to the physique of each individual user.

[0015] Furthermore, the chair of the fifth invention is a chair that, compared to any of the second to fourth inventions, further comprises a headrest that is positioned inside the backrest and is capable of supporting the head of a seated user, the headrest being displaceable in a predetermined direction relative to the support member, and is configured so that, in the stored state, the headrest and the support member can overlap in this order from the inside to the outside.

[0016] This configuration allows the chair to support the user's head.

[0017] Furthermore, the chair of the present sixth invention is a chair according to any one of the first to fifth inventions, further comprising a strap that can be engaged with the main body, and the strap is configured to be adjustable in length.

[0018] With this configuration, the user can use the strap to more easily carry the chair when in the stored state, and to regulate the position of the chair relative to the installation surface when in use.

[0019] Furthermore, the chair of the seventh invention is a chair that, compared to any of the first to sixth inventions, further comprises a protruding member that is arranged to protrude rearward from the rear end of the main body and restricts rearward rotation of the entire main body relative to the installation surface, and the protruding member is displaceable relative to the main body so as not to protrude rearward from the main body.

[0020] This configuration allows the chair to be used stably on the installation surface.

[0021] Furthermore, the chair of the eighth invention is a chair in which, compared to any of the first to seventh inventions, the main body includes a seat unit on which a seat is provided, and a grounding member that is arranged at the bottom of the main body and contacts the installation surface to support the seat unit, and the grounding member is configured to be displaceable relative to the seat unit at least between a first position and a second position.

[0022] This configuration allows the angle of the chair to be changed on the installation surface. [Effects of the Invention]

[0023] According to the present invention, a chair that can be easily transported to various places can be provided. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view of a chair according to the present embodiment; [Figure 2] A perspective view of the chair from below. [Figure 3] FIG. 1 is an exploded perspective view showing a schematic configuration of the chair. [Figure 4] Side view of the chair [Figure 5] Rear view of the chair [Figure 6] Front view of the chair [Figure 7] Plan view of the chair [Figure 8] Bottom view of the chair [Figure 9] A side view showing the tilted state of the chair [Figure 10] FIG. 10 is a side view showing an example of a state in which the support member of the chair is displaced. [Figure 11] FIG. 10 is a perspective view showing an example of a state in which an accessory member is attached to the chair. [Figure 12] A side view showing one example of how the chair is used. [Figure 13] FIG. 10 is a perspective view showing the storage state of the chair. [Figure 14] A front view showing the storage state of the chair [Figure 15] A diagram explaining the procedure for transitioning the chair from its stored state to its usable state. [Figure 16] A side view of a chair according to a modified example of the present invention. [Figure 17] FIG. 10 is a side view showing the chair in a tilted position. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments of a chair and the like will be described with reference to the drawings. Note that components with the same reference numerals in the embodiments perform similar operations, and therefore repeated description may be omitted.

[0026] In the following description, coordinates shown in the drawings are common to all the drawings. The Z direction of the coordinate system (the positive direction on the Z axis) is perpendicular to the horizontal plane, i.e., up. Down is the opposite direction to up. The Y direction (the positive direction on the Y axis) is perpendicular to the Z direction, i.e., right. Right is the direction toward the right hand side as seen from a user sitting in the chair in a normal manner. Left is the opposite direction to right. The X direction is perpendicular to the Z direction and perpendicular to the Y direction. The Y direction can also be said to be rear as seen from a user sitting in the chair in a normal manner. Front is the opposite direction to rear. In the following description of each part of the chair, the above-mentioned directions are used to indicate the positions of each part in a usable state where a user can sit, unless otherwise specified. In the following description of the chair in use, the directions indicated correspond to the directions as seen from a user sitting on the seat in a normal manner. In the following, the shape and positional relationship of each part may be explained by indicating each direction in this manner, but these are defined merely for the convenience of explanation and do not limit the orientation or posture of the chair of the present invention when in use.

[0027] (Embodiment)

[0028] In this embodiment, the chair is a chair that can maintain the posture of a seated user. The chair can be used, for example, for infants who are not yet fully developed in their ability to support their trunks, or for users who have difficulty maintaining a seated position due to functional disorders in some parts of their body. Such a chair function makes it easier for the user to maintain a seated position. However, the chair is not limited to such uses. For example, the chair may be configured so that it can be used by infants and children with developed physical functions, or adults.

[0029] In this embodiment, the chair has a backrest that can rotate relative to a main body having a seat. The chair is configured so that it has a box-like shape as a whole when it is in a usable state in which a user can sit, and when it is in a stored state in which the backrest is rotated relative to the main body. In other words, the chair is configured so that it has a box-like shape as a whole when it is folded and stored for easy transport. In other words, the back of the chair has an outer surface that forms part of the outer surface of the box shape in the stored state. A chair configured in this way will be described below with reference to the drawings.

[0030] FIG. 1 is a perspective view of a chair 1 in this embodiment. FIG. 2 is a perspective view of the chair 1 as seen from below. FIG. 3 is an exploded perspective view showing a schematic configuration of the chair 1. FIG. 4 is a side view of the chair 1. FIG. 5 is a rear view of the chair 1. FIG. 6 is a front view of the chair 1. FIG. 7 is a plan view of the chair 1. FIG. 8 is a bottom view of the chair 1.

[0031] As shown in the figure, chair 1 includes main body 10, shaft 40, backrest 50, support member 60, headrest 65, and protruding member 31. Chair 1 has a basic structure in which backrest 50 is rotatably attached to main body 10. In this embodiment, support member 60 is attached to backrest 50. Furthermore, headrest 65 is attached to support member 60.

[0032] Note that some components may be omitted from the drawings. For example, FIG. 3 shows the main components constituting chair 1. In FIG. 3, some relatively small components, such as screws, are omitted from the drawing. In addition, in this embodiment, covers with cushioning functions may be attached to the surfaces of seat 16, support member 60, and pad 67 of headrest 65 (described below), but these covers are not shown in FIG. 3. Chair 1 may be used with or without such covers attached. Note that FIG. 3 also shows accessory components, as described below. Details of the accessory components will be described later. The thin lines in each drawing indicate changes in the surface shape and are not lines representing patterns but lines representing the shape of the three-dimensional surface.

[0033] The main body 10 is a portion that can be placed on a placement surface. The placement surface may be, for example, the surface of a floor, the upper surface of various structures, or the seat surface of another chair, bench, or the like. The main body 10 is configured so that the buttocks of a seated user come into contact with the main body 10. That is, the user can use the chair 1 by sitting on the seat surface 16 provided on the main body 10. In this embodiment, the main body 10 has a generally rectangular parallelepiped shape. The main body 10 has a recess 15 recessed downward from the top surface, configured to accommodate the buttocks of a seated user. The main body 10 is configured so that the seat surface 16 forms the bottom of the recess 15. In other words, the recess 15 has the seat surface 16.

[0034] In this embodiment, the main body 10 has, for example, a seat unit 11, a ground contact member 21, and an angle change mechanism 25. In addition, the protruding member 31 is attached to the main body 10. It may be said that the main body 10 has the protruding member 31.

[0035] The seat unit 11 is provided with a seat surface 16. The seat unit 11 is formed, for example, by combining multiple divided resin members. In this embodiment, as shown in FIG. 3, the seat unit 11 includes a member in which a recess 15 is formed to include the seat surface 16, and side panels 13b, 14b attached to both the left and right sides of the member. Note that the member configuration of the seat unit 11 is not limited to this, and various division methods may be used. The seat unit 11 may also be molded from a single resin member. Note that in this embodiment, a resin member refers to a member made entirely of resin, and may also include a member that includes a portion that is not made of resin. Note that the seat unit 11 may also be formed from a material other than resin. For example, the side panels 13b, 14b may be made of sheet metal.

[0036] The seat unit 11 has a holding portion 12, a right armrest 13, a left armrest 14, a strap engaging portion 18, and a table mounting portion 19.

[0037] The holding portion 12 is located at the top of the seat unit 11, near the rear end of the seat unit 11. The holding portion 12 is located behind the recess 15. The holding portion 12 rotatably holds the support portion 53 of the backrest 50. The holding portion 12 holds the support portion 53 via the shaft portion 40. The holding portion 12 may also be expressed as a portion that holds the rotation shaft of the backrest 50.

[0038] The right armrest 13 is located to the right of the recess 15. The left armrest 14 is located to the left of the recess 15. That is, the right armrest 13 and the left armrest 14 are arranged side by side in the left-right direction with the recess 15 and the seat surface 16 sandwiched between them. In this embodiment, the upper ends of the right armrest 13 and the left armrest 14 are on the upper surface of the seat surface unit 11. The upper ends of the right armrest 13 and the left armrest 14 are located above the seat surface 16. The outer surface of the right side of the right armrest 13 and the outer surface of the left side of the left armrest 14 are flat and perpendicular to the Y direction. Each outer surface has a substantially rectangular shape when viewed from the side. Note that the right armrest 13 and the left armrest 14 are referred to as armrests merely for the sake of convenience. The armrests 13, 14 do not necessarily have to be formed so as to provide a suitable location for a user seated in the chair 1 to rest their elbows.

[0039] Because the support portion 12, the right armrest 13, and the left armrest 14 are formed in this manner, a recess 15 is formed so as to be recessed downward from the upper surface of the seat unit 11. The support portion 12, the right armrest 13, and the left armrest 14 are formed so as to surround the rear, right, and left of the seat surface 16 provided at the bottom of the recess 15. The front of the seat surface 16 is open. The recess 15 is configured to accommodate the buttocks of a seated user. When the user's buttocks are accommodated in the recess 15, the user's thighs and knees can be positioned in the open area in front of the seat surface 16. Note that when the chair 1 is not tilted, the seat surface 16 may be configured to slope downward from the front end, where the knees are located, toward the rear. This allows the user to sit in a position where the user's center of gravity is located lower in the chair 1, making it easier for the user to maintain a seated position.

[0040] The strap engagement portion 18 is provided on the outer surface of the right side of the right armrest 13 and the outer surface of the left side of the left armrest 14. The strap engagement portion 18 is a portion where the strap attachment portions 3b at both ends of the strap 3 engage, as described below. In this embodiment, the strap engagement portion 18 is, for example, a shaft-mounted cap that penetrates (an example of engagement) the strap attachment portion 3b having a hole formed therein and is fixed to the seat unit 11. The configuration of the strap engagement portion 18 is not limited to this, and various configurations may be adopted. When viewed from the left and right, the strap engagement portion 18 is located closer to the axis of rotation of the backrest 50 relative to the main body 10 than the center of gravity of the chair 1 in a stored state, as described below. In other words, the strap 3 is attached to the main body 10 at a position closer to the axis of rotation of the backrest 50 than the center of gravity of the chair 1 in the stored state. This makes it easier to maintain the backrest 50 in a closed state when the chair 1 is suspended by the strap 3 in the stored state.

[0041] The table attachment portion 19 is provided on the outer surface of the right side of the right armrest 13 and the outer surface of the left side of the left armrest 14. As will be described later, a table support 93 of the table 91, which is an accessory member, can be attached to the table attachment portion 19. Specifically, the table attachment portion 19 has, for example, three screw holes. The table attachment portion 19 is configured so that the table support 93 can be attached and detached to the table attachment portion 19 by fixing means using, for example, screws. In other words, the table support 93 is detachable from the main body 10. Note that the number, positions, shapes, etc. of the screw holes of the table attachment portion 19 are not limited to those described above. Furthermore, the table attachment portion 19 may be configured so that the table support 93 can be attached to the table attachment portion 19 by using fixing means such as magnetic force or elasticity of resin.

[0042] 3, the grounding member 21 is disposed on the bottom of the main body 10. The grounding member 21 is located below the seat unit 11. The grounding member 21 comes into contact with the installation surface on which the chair 1 is placed, and supports the seat unit 11.

[0043] In this embodiment, the ground contact member 21 is attached at its rear end so as to be rotatable relative to the seat unit 11. For example, rotation shafts 29 are attached to the lower rear end of both the left and right sides of the seat unit 11, parallel to the Y direction. The ground contact member 21 is attached to the seat unit 11 via the rotation shafts 29 so that each rotation shaft 29 passes through via a bearing. In other words, the seat unit 11 is rotatable relative to the ground contact member 21 around the rotation shafts 29 that are provided at the lower rear end and parallel to the Y axis.

[0044] The grounding member 21 includes a bottom portion 22, a rising portion 23, and an engaging portion 24. The grounding member 21 is made of, for example, a resin member, but is not limited to this. For example, the grounding member 21 may be made of sheet metal. Alternatively, the grounding member 21 may be configured by assembling a plurality of separately formed members.

[0045] The bottom portion 22 is a plate-like portion formed substantially horizontally so as to cover the bottom surface of the seat unit 11. The bottom portion 22 has a substantially rectangular shape when viewed from the bottom.

[0046] The rising portions 23 are portions formed to rise upward from the bottom portion 22. In the present embodiment, the rising portions 23 are formed on both the left and right ends of the bottom portion 22. The rising portions 23 are formed in the shape of flat plates that are approximately perpendicular to the Y direction. In other words, the rising portions 23 are approximately perpendicular to the rotation axis 29. The left and right rising portions 23 are housed inside the left armrest 14 and the right armrest 13, respectively.

[0047] The engaging portion 24 is a portion configured to be engageable with the engaging member 27 of the angle change mechanism 25. In this embodiment, the engaging portion 24 is formed in the rising portion 23. For example, the engaging portion 24 is formed at each of a plurality of locations that are equally spaced from the rotation axis 29. Each engaging portion 24 is formed at a position where the engaging member 27 can engage when the ground contact member 21 is positioned relative to the seat unit 11 at a predetermined position. In this embodiment, for example, each rising portion 23 is formed with a plurality of through-hole engaging portions 24 and one elongated hole portion 24b formed to connect to each through-hole. The plurality of through-holes are formed at a plurality of locations whose distance from the rotation axis 29 is a first dimension. The elongated hole portion 24b is formed along an arc centered on the rotation axis 29 and whose radius is a second dimension slightly larger than the first dimension. The plurality of through-holes are formed in pairs on the left and right rising portions 23.

[0048] In this embodiment, the angle change mechanism 25 has an engagement member 27 and a tilt operation unit 28. In this embodiment, the angle change mechanism 25 is disposed below the seat surface 16 in the front part of the seat surface unit 11.

[0049] The engaging member 27 is, for example, a rod-shaped member parallel to the Y direction. The engaging member 27 is held in the seat unit 11 so as to be biased rearward by, for example, a spring or the like. Both ends of the engaging member 27 are held in a state of being fitted (engaged) with one of the pairs of engaging portions 24 on the left and right.

[0050] Tilt operation unit 28 is attached to engagement member 27. Tilt operation unit 28 has a lever-like portion exposed from the underside of seat 16 so that it can be operated by the user (operator). The operator can displace engagement member 27 forward by sliding tilt operation unit 28 forward. This releases engagement of engagement member 27 with engagement portion 24. Because engagement member 27 is biased rearward by a spring or the like, engagement member 27 engages with one of engagement portions 24 when the operator no longer operates to slide tilt operation unit 28.

[0051] The main body 10 is capable of changing the angle of the seat unit 11 relative to the ground surface by using the angle change mechanism 25 having such a configuration. That is, when the engagement member 27 is engaged with the engagement portion 24, the seat unit 11 is positioned relative to the ground contact member 21. When the engagement member 27 is disengaged from the engagement portion 24, the seat unit 11 becomes rotatable around the rotation axis 29 relative to the ground contact member 21. In this case, as the seat unit 11 rotates relative to the ground contact member 21, both ends of the engagement member 27 move within the elongated hole portions 24b connected to the engagement portions 24. That is, the ground contact member 21 is configured to be displaceable at least between a first position and a second position relative to the seat unit 11. It should be noted that the angle change mechanism 25 may be interpreted as including the ground contact member 21 in addition to the engagement member 27 and the tilt operation unit 28.

[0052] FIG. 9 is a side view showing the chair 1 in a tilted state.

[0053] As shown in FIG. 9 , in this embodiment, the chair 1 can be tilted from the non-tilted state shown in FIG. 4 to a tilt state in which the seat unit 11 is tilted backward by up to approximately 30 degrees. In this embodiment, the tilt angle of the seat unit 11 is determined by the position of the engagement portion 24 with which the engagement member 27 engages. In this embodiment, the seat unit 11 can be set to six tilt angles ranging from the minimum tilt angle (0 degrees) to the maximum tilt angle (approximately 30 degrees). This allows a preferred tilt angle to be set depending on the user's condition, purpose, etc. As the seat unit 11 rotates relative to the contact member 21, the backrest 50 and other components supported by the seat unit 11 also rotate together. The entire chair 1 can be tilted while maintaining the user's posture. Note that the positions and number of engagement portions 24 with which the engagement member 27 can engage are not limited to those described above. In other words, the settable tilt angle may be changed by changing the number of engagement portions 24, etc. Furthermore, the angle change mechanism 27 may have, for example, an engaging member that can be displaced so as to reciprocate in the Y direction in response to a user operation. Such a mechanism can be realized by, for example, appropriately utilizing a link mechanism or the like.

[0054] Returning to Figure 3 etc., the protruding member 31 is arranged on the underside of the main body 10. In this embodiment, the protruding member 31 is configured to be able to be pulled out rearward from a state in which it is housed inside the main body 10. That is, the protruding member 31 can be arranged so as to protrude rearward from the rear end of the main body 10 (the rear end of the seat unit 11). Furthermore, the protruding member 31 can be displaced relative to the main body 10 so as not to protrude rearward from the main body 10. When arranged so as to protrude rearward, the protruding member 31 restricts the entire main body 10 from rotating rearward relative to the ground surface. That is, by using the protruding member 31, it is possible to make it difficult for the chair 1 to tip backward.

[0055] In this embodiment, the protruding member 31 is disposed between the bottom 22 of the ground contact member 21 and the seat unit 11 so as to be slidable in the front-rear direction relative to the main body 10. The protruding member 31 is, for example, a resin member, but may also be formed using a sheet metal member, a metal rod, or the like. A ground contact portion 33 extending substantially parallel to the Y direction is provided at the rear end of the protruding member 31. When the protruding member 31 protrudes rearward from the main body 10, the ground contact portion 33 is configured to contact the ground surface on which the main body 10 is placed or to be located near the ground surface. Note that the protruding member 31 may be, for example, a plurality of members that are independently displaceable relative to the main body 10. Furthermore, the protruding member 31 is not limited to being slidable relative to the main body 10. For example, the protruding member 31 may be a detachable member whose attachment position relative to the main body 10 can be changed, or a member that can be rotated relative to the main body 10. In either case, the protruding member 31 may be configured to protrude rearward from the main body 10 or not protrude rearward from the main body 10.

[0056] As shown in FIG. 3, the backrest 50 has an outer surface portion 51, a support portion 53, a rail 55, and a positioning mechanism 57. Each portion is made of resin. However, some or all of the portions may be made of other materials such as metal. The backrest 50 as a whole has a rectangular plate shape that is approximately the same as the outer shape of the top surface of the main body 10.

[0057] The outer surface 51 is a portion located on the outside of the backrest 50 (the rear surface when in use). In this embodiment, the outer surface 51 is formed in a roughly flat shape, except for the peripheral portion which is formed to be rounded. In this embodiment, the outer surface 51 is made of a single member and is devised to have a design with a simple texture.

[0058] Support portion 53 is provided inside backrest 50, at the bottom of backrest 50 when in use. Support portion 53 has a shape corresponding to holding portion 12 of main body 10, and is a portion supported by holding portion 12 via shaft portion 40.

[0059] The rail 55 is located inside the backrest 50, in the center between the left and right sides. The rail 55 is formed along a direction perpendicular to the up-down direction, i.e., the Y direction. The rail 55 is configured to engage with a support member 60. This allows the support member 60 to slide along the rail 55 relative to the backrest 50.

[0060] The positioning mechanism 57 is disposed inside the backrest 50, facing the support member 60. The positioning mechanism 57 can determine the position of the support member 60 relative to the backrest 50. Various specific configurations can be employed for the positioning mechanism 57. For example, a mechanism that engages the backrest 50 side and the support member 60 side by a snap fit or the like that utilizes the elasticity of resin or the like, or a mechanism that engages both sides with a member such as a pin (not shown), can be appropriately employed. The formation of the positioning mechanism 57 can prevent the support member 60 from shifting downward due to gravity or from being displaced when a slight external force is applied.

[0061] The support member 60 is attached to the inside of the backrest 50, which is the side where a seated user is positioned. The support member 60 has a shape that can support the upper body of a seated user. Specifically, for example, the support member 60 has a shape such that the outer end portions in the left-right direction protrude (bulge) forward more than the center portion. These bulging portions can regulate the left-right position of the user's torso and support the user's upper body. Note that the shape of the support member 60 is not limited to this, and can be changed depending on the intended use of the chair 1, etc. Also, support members 60 of different shapes may be prepared according to individual users and attached and detached to the backrest 50 as appropriate.

[0062] The headrest 65 is disposed inside the backrest 50. The headrest 65 is configured to be able to support the head of a seated user. Note that the chair 1 does not necessarily have to have the headrest 65.

[0063] In this embodiment, headrest 65 has pad 67, support posts 68, and positioning portions 69. Each portion is made of a resin material, but may be made of other materials, such as metal materials.

[0064] The pad 67 is a portion that faces the user's head. The pad 67 has a shape that allows it to support the user's head. Specifically, for example, the pad 67 has a shape in which the left and right end portions protrude forward more than the center portion. These end portions can restrict the left-right position of the user's head and support the user's head in the left-right direction. Note that the shape of the pad 67 is not limited to this, and can be changed depending on the purpose of use of the chair 1, etc. Furthermore, pads 67 shaped according to individual users may be prepared and attached / detached to the backrest 50 as appropriate.

[0065] A pad 67 is attached to the support pillar 68. The support pillar 68 is, for example, a rod-like member having a length in the vertical direction. In this embodiment, the support pillar 68 is disposed in the space between the backrest 50 and the support member 60. In other words, the headrest 65 is supported by the backrest 50 such that the support pillar 68 is sandwiched between the backrest 50 and the support member 60 in the front-rear direction.

[0066] The positioning portion 69 is formed on the support pillar 68. In this embodiment, the positioning portion 69 is, for example, a step-shaped uneven portion formed on the front surface of the support pillar 68. That is, a snap fit or the like that utilizes the elasticity of resin or the like to engage with the positioning portion 69 is formed on the portion of the support member 60 that faces the support pillar 68. This fixes the position of the headrest 65. Note that the positioning portion 69 may also be formed by other engaging structures or the like.

[0067] The support member 60 is configured to be slidable in a predetermined direction relative to the backrest 50. That is, as described above, the support member 60 is displaceable along the rail 55. Note that the support member 60 may not be displaceable. Furthermore, the support member 60 does not have to be attached to the backrest 50. In this case, the inner shape of the backrest 50 may be configured so that it can support the upper body of the user in the same way as the support member 60.

[0068] In the present embodiment, the headrest 65 is configured to be displaceable in a predetermined direction relative to the support member 60. Specifically, the headrest 65 is displaceable in the up and down direction relative to the support member 60. The headrest 65 is attached to the support member 60. The headrest 65 is displaceable relative to the backrest 50 together with the support member 60. The headrest 65 is displaceable relative to the backrest 50 while the position of the support member 60 relative to the backrest 50 remains fixed.

[0069] FIG. 10 is a side view showing an example of the state in which the support member 60 of the chair 1 is displaced.

[0070] 10, when the support member 60 is displaced upward, the distance from the seat surface 16 to the support member 60 and the headrest 65 becomes longer. Therefore, by displacing the support member 60 to an appropriate position depending on the user's physique, etc., the chair 1 becomes easy to use for a variety of users. In addition, by displacing the headrest 65 to an appropriate position depending on the user's physique, etc., the chair 1 becomes easy to use for a variety of users.

[0071] Returning to Figure 3 etc., the shaft 40 is interposed between the holding portion 12 of the main body 10 and the support portion 53 of the backrest 50. The shaft 40 serves as the axis of rotation when the backrest 50 rotates relative to the main body 10. In this embodiment, the shaft 40 includes a shock absorber 41, a locking mechanism 45, and an opening / closing operation portion 46.

[0072] The shock absorber 41 is a so-called swing damper. The shock absorber 41 is arranged coaxially with the rotation axis. The shock absorber 41 generates a resistance force when the backrest 50 rotates relative to the main body 10. The shock absorber 41 is configured to generate a resistance force particularly when the backrest 50 is closed, but is not limited to this. This prevents the backrest 50 from rotating forcefully relative to the main body 10. Therefore, it is possible to prevent foreign objects from being unintentionally pinched between the main body 10 and the backrest 50, etc., when changing from the in-use state to the stored state, and to prevent damage to the chair 1.

[0073] In this embodiment, the locking mechanism 45 can fix the position of the backrest 50 relative to the main body 10 when in use. The locking mechanism 45 is provided with an opening / closing operation unit 46 operated by a user (operator). The opening / closing operation unit 46 is disposed below the holding unit 12 of the seat unit 11 so as to protrude downward. In this embodiment, for example, a member that moves toward or away from the support unit 53 in response to operation of the opening / closing operation unit 46 is held by the holding unit 12. The member is also biased toward the support unit 53 by a spring. When the backrest 50 assumes a predetermined position in use, this member engages with the support unit 53, thereby preventing the backrest 50 from displacing relative to the main body 10. Note that the specific configuration of the locking mechanism 45 is not limited to the above, and various structures can be adopted. For example, the position of the backrest 50 may be locked using a gear or a cam and a member that engages with the gear or cam. The provision of the locking mechanism 45 in this manner makes it possible to prevent the backrest 50 from rotating relative to the main body 10 when the user does not intend to do so. This makes it possible to prevent foreign objects from being caught between the main body 10 and the backrest 50 or the like without the user's intention.

[0074] The locking mechanism 45 may be configured to fix the position of the backrest 50 relative to the main body 10 in the stored state. The locking mechanism 45 may also be configured to fix the position of the backrest 50 relative to the main body 10 in both the use state and the stored state. In this case, the locking mechanism 45 may be configured so that a member that moves toward or away from the support portion 53 in conjunction with the opening / closing operation portion 46 engages with the support portion 53 when the backrest 50 assumes a predetermined posture in the stored state. In this way, even when the locking mechanism 45 is provided to restrict the rotation of the backrest 50 in the stored state, it is possible to prevent the backrest 50 from rotating relative to the main body 10 unintentionally by the user.

[0075] As shown in FIG. 1, in this embodiment, the chair 1 is provided with a first adhesive portion 11b on the main body 10 and a second adhesive portion 50b on the backrest 50. The first adhesive portion 11b is provided on the front upper surface of the right armrest 13 and the front upper surface of the left armrest 14. The second adhesive portions 50b are provided on the inner surface of the backrest 50 near both ends of the upper part. The first adhesive portion 11b and the second adhesive portion 50b are positioned opposite each other when the backrest 50 is placed on the main body 10 in the stored state. At least one of the first adhesive portion 11b and the second adhesive portion 50b is a magnet or the like. The first adhesive portion 11b and the second adhesive portion 50b are configured to adhere to each other due to a magnetic attraction force acting between them. This allows the backrest 50 to remain placed on the top surface of the main body 10 in the stored state. In the stored state, even if an external force such as a shaking force is applied to the chair 1, it is possible to prevent the backrest 50 from slightly displacing relative to the main body 10 and causing it to flap. Furthermore, when the user intentionally performs an operation, the backrest 50 can be easily separated from the main body 10. Therefore, the chair 1 can be easily changed from the stored state to the usable state. Note that such suction portions 11b, 50b do not necessarily have to be provided. Also, for example, a hook-and-loop fastener or the like may be provided instead of or in addition to the suction portions 11b, 50b. The hook-and-loop fastener or the like may be any fastener capable of fastening the backrest 50 to the main body 10.

[0076] Next, the accessories of the chair 1 will be described.

[0077] Fig. 11 is a perspective view showing an example of a state in which accessory members are attached to the chair 1. Fig. 12 is a side view showing one example of how the chair 1 is used.

[0078] 11 and 3, in this embodiment, accessories such as a strap 3, a fixing belt 5, a waist belt 7, and a chest belt 8 can be attached to the chair 1 as needed. In addition, accessories such as a table 91 and a knee support 95 can be attached to the chair 1.

[0079] In this embodiment, the seat unit 11 is configured to allow attachment of a waist belt 7. As shown in FIG. 3, in this embodiment, the waist belt 7 is fixed at three anchors 7b, one on each side of the waist and one under the crotch. This restricts the position of the waist of the seated user and prevents the user from slipping forward. The user's buttocks can be kept accommodated in the recess 15, and the user can be maintained in a seated position. The position of the anchors 7b is configured to be movable in the front-to-rear direction, allowing the waist belt 7 to be attached to an appropriate position depending on the user's physique, etc. However, the position of the anchors 7b is not limited thereto. The position of the anchors 7b may also be configured to be movable in a direction other than the front-to-rear direction. The position of the anchors 7b does not have to be changeable.

[0080] In this embodiment, the support member 60 is configured to allow attachment of a chest belt 8. As shown in FIG. 3, the chest belt 8 is fixed at two anchors 8b on the left and right sides of the chest. This restricts the position of the chest of the seated user and prevents the user from slipping forward or tilting left or right. The user's upper body can be maintained in a state supported by the support member 60, and the user can maintain a seated position. The chest belt 8 may be formed in a ring shape, with a portion passing between the support member 60 and the backrest 50. The anchor 8b of the chest belt 8 may be provided on the backrest 50. That is, the chest belt 8 may be attached to the support member 60 or the backrest 50.

[0081] The type of belt used to maintain the user's seated position is not limited to this. For example, the waist belt may also be a two-point belt. Alternatively, a belt in which the belts for securing the chest and waist are both connected by buckles may be used. A belt that fits the user may be attached as appropriate to an anchor or the like provided in advance on the chair 1.

[0082] The strap 3 is a belt that can be used when carrying the chair 1. The strap 3 engages with the strap engagement portion 18 of the main body 10 at strap attachment portions 3b provided at both ends. The looped strap 3 may be attached to the main body 10 by passing through the inside of the main body 10. The strap 3 is provided with a length adjustment portion 3c, so that the length between both ends can be changed. The strap 3 has a buckle that can be detached and reattached along the way. Therefore, by detaching and reattaching as needed, it is easy to surround other components with the strap 3. Furthermore, when carrying the chair in a stored state as described below, the strap 3 can be easily worn diagonally (meaning that the head and one arm are passed through the looped strap 3 and the strap is worn from the right side of the torso over the left shoulder, or from the left side of the torso over the right shoulder).

[0083] The fixing belt 5 is a belt that can be attached to the bottom of the chair 1. The fixing belt 5 is attached to fixing belt attachment parts 5b provided on both the left and right sides of the main body 10. In this embodiment, the fixing belt attachment parts 5b are attached to the outside of the left and right rising parts 23. The fixing belt attachment parts 5b are buckles that mate with the ends of the fixing belt 5. With both ends of the fixing belt 5 attached to the two fixing belt attachment parts 5b, the main body 10 and the fixing belt 5 form a loop. It is desirable that the fixing belt 5 is also configured so that its length can be adjusted.

[0084] The straps 3 and the fixing belts 5 can be used, for example, to regulate the position of the chair 1 when in use. That is, as shown in FIG. 12 , assume that the chair 1 is placed on a table 800, such as a dining chair. The table 800 has a seating surface 801 that serves as the seat and a back 803 that serves as the backrest. When the chair 1 is placed on such a table 800, for example, the straps 3 can be routed around the back 803, and the length of the straps 3 can be adjusted to reduce slack. This can regulate the chair 1 from moving forward relative to the table 800. Furthermore, for example, the fixing belts 5 can be routed around the table 801, and the length of the fixing belts 5 can be adjusted to reduce slack. This can ensure that the chair 1 is less likely to shift on the table 801. Therefore, the chair 1 can be used safely. In this embodiment, the straps 3 and the fixing belts 5 are designed to be attachable and detachable so that they can be used only when necessary. To facilitate carrying the detached fastening belt 5 and the like together with the chair 1, the main body 10 is provided with, for example, a storage pocket 10b (shown in FIG. 3). The storage pocket 10b is formed in the recess 15 at a portion in front of the holding portion 12 so as to be recessed downward from the periphery. That is, the storage pocket 10b has an opening that opens into the recess 15. The detached fastening belt 5 can be stored inside the storage pocket 10b. That is, in this embodiment, the fastening belt 5 can be stored inside the main body 10. When seated, part or all of the opening of the storage pocket 10b can be covered by a cover placed on the seat surface 16. Note that the storage pocket 10b may be configured to store accessories other than the fastening belt 5.

[0085] The table 91 is detachable from the main body 10. As shown in FIG. 12, the table 91 is configured to be installed in front of the upper body of a seated user, positioned around the waist or thighs. The table 91 includes two table supports 93. The table supports 93 are arranged to protrude downward from positions near the left and right ends of the table 91. Each table support 93 is attached to the table mounting portion 19 so that the left and right table supports 93 sandwich the side surfaces of the main body 10. The length of the table supports 93 is changeable. That is, the table 91 is configured so that its height position relative to the seat surface 16 can be adjusted.

[0086] The knee support 95 is detachable from the main body 10. In this embodiment, the knee support 95 is attached to the front end of the seat unit 11. As shown in FIG. 12, the knee support 95 supports the thighs of a seated user near the knees. This allows the user to sit comfortably in the chair 1. The knee support 95 is formed so that the tilt operation unit 28 remains exposed to the outside of the main body 10. This makes it possible to change the tilt angle of the chair 1 even when the knee support 95 is attached.

[0087] Next, the chair 1 in the stored state will be described.

[0088] Fig. 13 is a perspective view showing the stored state of the chair 1. Fig. 14 is a front view showing the stored state of the chair 1.

[0089] FIG. 13 shows a state in which the strap 3 is attached to the chair 1. In this embodiment, the state of the chair 1 can be changed as needed between a use state in which a user can sit on it and a storage state in which the backrest 50 is positioned so as to cover the upper part of the seat surface 15. As shown in FIG. 13, the chair 1 is configured to have an overall box shape in the storage state. The box shape may be, for example, a rectangular parallelepiped shape. The chair 1 in the storage state, which has such a box-like shape, can be easily carried by the user to various places. When carrying the chair 1, the strap 3 attached to the main body 10 can be used. This makes it easier to carry the chair 1, and also, when using the chair 1, the strap 3 can be conveniently utilized as described above.

[0090] Here, in the stored state, chair 1 has one or more surfaces (one or more surfaces) positioned to cover both the left and right sides and the top of seat surface 15. The one or more surfaces are composed of the outer surface of main body 10 and the outer surface of backrest 50. That is, in this embodiment, chair 1 has a rectangular parallelepiped shape, and chair 1 can be roughly said to have three surfaces covering seat surface 15: the top surface, the left surface, and the right surface. These three surfaces can be said to be composed of the outer surface of both the left and right sides of main body 10 (i.e., the outer surfaces of side panels 13b and 14b) and outer surface 51 of backrest 50. In this way, box-shaped chair 1 appears like a single block or mass, giving the viewer an impression of order. In this embodiment, backrest 50 and main body 10 are configured so that there is only a slight difference in the level of their outer surfaces, except for the front when in the stored state. This gives the viewer an even more orderly impression. In addition, in this embodiment, chair 1 has a rectangular parallelepiped shape in the stored state, so it can be easily stored in a storage location and can be stored without creating dead space. Furthermore, when chair 1 is placed flat in the stored state, a flat upper surface is obtained, and it can also be used as a simple table or desk.

[0091] In the stored state, the components arranged inside the backrest 50, i.e., the support member 60 and the headrest 65, are configured to face the seat surface 15. In this embodiment, these components, such as the support member 60 and the headrest 65, are accommodated in the recess 15. In other words, the recess 15 is configured so that the support member 60 fits into the recess 15 in the stored state. Furthermore, the recess 15 is configured so that the headrest 65 fits into the recess 15 in the stored state. This can also be expressed as the support member 60 and the headrest 65 being located between the right armrest 13 and the left armrest 14 in the left-right direction. This configuration of the chair allows the chair 1 to be more compact in the stored state. Therefore, the chair 1 can be more easily carried. The chair 1 being compact can also be expressed as the volume occupied by the chair 1 being small.

[0092] As shown in FIG. 14 , in the stored state, the headrest 65 and the support member 60 are configured to be able to overlap in this order from the inside to the outside of the chair 1. That is, the pad 67 of the headrest 65 is located above the seat surface 16. The support member 60 is located above the pad 67. This configuration allows the chair 1 to be made even more compact in the stored state. This overlap between the headrest 65 and the support member 60 can be achieved, for example, by providing a gap between the pad 67 and the support column 68 into which a portion of the support member 60 fits. That is, when transitioning to the stored state, the headrest 65 is displaced downward relative to the support member 60 so that the pad 67 and the surface of the support member 60 overlap, allowing the headrest 65 and the support member 60 to easily overlap.

[0093] FIG. 15 is a diagram illustrating the procedure for transitioning the chair 1 from the stored state to the use state.

[0094] In FIG. 15, accessory members are not shown. In the stored state shown as step S11, the chair 1 is box-shaped overall. To change the chair 1 from the stored state to the usable state, the user simply pulls the portion of the backrest 50 near the top end (in the stored state, the portion near the front end) away from the main body 10. By configuring the chair 1 so that the magnetic attraction force acting between the first attraction portion 11b and the second attraction portion 50b can be released with a light force, the chair 1 can be easily put into the usable state when necessary. The user also pulls the protruding member 31 out from the main body 10 and then protrudes it. This results in the state shown in step S12.

[0095] In the state shown in step S12, the support member 60 is positioned relatively low, and the support member 60 and the pad 67 of the headrest 65 overlap in the front-to-rear direction. Therefore, the positions of the support member 60 and the headrest 65 are adjusted to suit the user. This puts the chair 1 into the use state shown in step S13, and the user can sit on it.

[0096] It should be noted that the chair 1 can be tilted backward from the use state shown in step S13. That is, to set a tilt angle such as that shown in step S14, the user simply operates the tilt operation unit 28. By performing a predetermined operation on the tilt operation unit 28, such as displacing it forward, the engagement of the engagement member 27 with the engagement portion 24 is temporarily released, and the seat unit 11 is set in a state in which it can rotate relative to the ground contact member 21. In this state, the seat unit 11 is rotated backward together with the backrest 50. Then, by releasing the operation on the tilt operation unit 28 and engaging the engagement member 27 with another engagement portion 24 that corresponds to the current tilt angle, the tilt angle can be fixed in place.

[0097] Note that the chair 1 can be changed from the in-use state to the storable state by following the steps from step S11 to step S14 in reverse. To change the chair 1 from the in-use state to the storable state, the user simply operates the opening / closing operation unit 46. By operating the opening / closing operation unit 46 in a predetermined manner, for example by sliding it to the right, the backrest 50 is made rotatable relative to the main body 10. Then, in this state, the backrest 50 is displaced from the open state to the closed state. As a result, unless such an intentional user operation is performed, the backrest 50 can be reliably maintained in the open state.

[0098] As described above, according to this embodiment, chair 1 is compact in the stored state. Therefore, a user can easily carry chair 1. Chair 1 has main body 10 that can be placed on a placement surface, so it can be easily used anywhere as long as there is enough space to place main body 10. It is extremely easy to change chair 1 from the stored state to the used state and from the used state to the stored state. Therefore, it is possible to provide a highly convenient chair 1 that can be easily carried and used in a variety of places.

[0099] Here, the chair 1 according to this embodiment can also be used as a chair with a so-called seating position support function for users who have difficulty maintaining a seated position due to functional impairment in a part of their body. Conventional seating position support devices are large and space-consuming, making them difficult to carry to various places. In contrast, the chair 1 according to this embodiment can be folded into a small storage state as described above, making it easily portable. Therefore, when a user goes out to various places, the user can carry the chair 1 with them and easily use the seating position support function.

[0100] (Description of Modifications)

[0101] The configuration of the angle change mechanism is not limited to the above embodiment. For example, a kickstand-type grounding member may be provided instead of the above-described grounding member 21, so that the tilt angle of the chair can be adjusted.

[0102] FIG. 16 is a side view of a chair 201 according to a modified example of the present invention.

[0103] 16, chair 201 differs from chair 1 in the following respects regarding main body 10. That is, two ground contact members (first ground contact member 221 and second ground contact member 231) 221, 231 are provided instead of the above-described ground contact member 21 and angle changing mechanism 25. Also, protruding member 31 is not provided.

[0104] The first ground contact member 221 is disposed near the front end of the bottom of the main body 10. In the stored state and when no tilt angle is applied, the first ground contact member 221 is located at a first position above the bottom surface of the main body 10. The first ground contact member 221 is held rotatably relative to the seat unit 11 in the direction indicated by the arrow in the figure, for example, around a rotation axis 223 provided at the front. The first ground contact member 221 can rotate up to a predetermined angle relative to the seat unit 11. The position of the first ground contact member 221 rotated to this state may be referred to as a second position.

[0105] The second ground contact member 231 is disposed near the rear end of the bottom of the main body 10. In the stored state and when no tilt angle is applied, the second ground contact member 231 is located above the bottom surface of the main body 10. The second ground contact member 231 is held rotatably relative to the seat unit 11 in the direction indicated by the arrow in the figure, for example, around a rotation axis 233 provided at the rear. The second ground contact member 231 can rotate relative to the seat unit 11 up to a predetermined angle.

[0106] The chair 201 is configured so that a tilt angle can be set by displacing the first ground contact member 221 from a first position to a second position relative to the seat unit 11. The first ground contact member 221 in the second position is configured so that it can support the seat unit 11 by contacting the ground surface of the chair 201.

[0107] FIG. 17 is a side view showing the chair 201 in a tilted position.

[0108] 17, the first ground contact member 221 is located at the second position. Also, the second ground contact member 231 is located at a position (hereinafter referred to as the tilt position) rotated by a predetermined angle with respect to the seat unit 11 from the position shown in FIG. 16 described above. In the tilt position, the second ground contact member 231 functions as a protruding member protruding rearward from the rear end of the main body 10.

[0109] 17, the first ground contact member 221 and the second ground contact member 231 come into contact with the ground surface, causing the chair 201 as a whole to tilt backward. In this case, the chair 201 is supported on the ground surface by the first ground contact member 221 and the second ground contact member 231. The second ground contact member 231 comes into contact with the ground surface behind the rear end of the main body 10, making it difficult for the chair 201 to tip backward.

[0110] The chair 201 configured in this manner can also achieve the same effects as those described above. Since the chair 201 has a simpler component configuration, the manufacturing cost of the chair 201 can be reduced. The angle of each of the ground contact members 221, 231 relative to the seat unit 11 may be set by the user or may be selected from options prepared in advance. This allows multiple tilt angles to be set.

[0111] (others)

[0112] The present invention is not limited to the above-described embodiment, and various modifications are possible, and these modifications are also included within the scope of the present invention.

[0113] The present invention is not limited to the configurations of the above-described embodiments, and some of the components and functions of the above-described embodiments may be omitted. Furthermore, the shape and size of each part of the chair may be changed as appropriate depending on the user and the purpose. [Industrial Applicability]

[0114] As described above, the chair according to the present invention can be easily carried to various places and is useful as a chair, etc. [Explanation of symbols]

[0115] 1, 201 chairs 3 Straps 5 Fixation belt 7. Waist belt 7b, 8b anchor 8 Chest belt 10 Main Unit 11 Seat unit 11b First suction part 12 Holding part 13 Right armrest 14 Left armrest 13b, 14b side panels 15 recess 16 seat 18 Strap engagement part 19 Table mounting part 21 Grounding member 22 Bottom 23 Rising section 24 Engagement part 24b Long hole part 25 Angle change mechanism 27 Engagement member 28 Tilt control section 29, 223, 233 Rotation axis 31 Protruding member 33 Grounding part 40 Shaft 41 Buffer 45 Locking mechanism 46 Opening and closing operation section 50b Second suction part 51 External surface 53 Support part 60 Support member 65 Headrest 67 Pad 68 Pillar 91 Table 93 Table Support 95 Knee Support 221 First grounding member 231 Second grounding member

Claims

1. A body having a seat and capable of being placed on a placement surface; A backrest rotatably attached to the body; a support member attached to the backrest on an inner side on which a seated user is positioned and capable of supporting an upper body of the seated user; the body has recesses on the right and left sides of the body configured to receive the buttocks of a seated user; In a stored state in which the backrest covers the upper part of the seat surface, an outer surface of the backrest covers the right side and the left side of the main body, and the main body and the backrest are configured to have a box shape, In the stored state, the support member is configured to be housed in the recess, The support member has a shape that protrudes forward in areas near both left and right ends relative to the central portion, and is configured to be able to regulate the left and right position of the torso of a seated user.

2. A body having a seat and capable of being placed on a placement surface; A backrest rotatably attached to the body; a support member attached to the backrest on an inner side on which a seated user is positioned and capable of supporting an upper body of the seated user; the body has recesses on the right and left sides of the body configured to receive the buttocks of a seated user; In a stored state in which the backrest covers the upper part of the seat surface, an outer surface of the backrest covers the right side and the left side of the main body, and the main body and the backrest are configured to have a box shape, In the stored state, the support member is configured to be housed in the recess, Further, a headrest is provided inside the backrest and capable of supporting a head of the seated user, The headrest is displaceable in a predetermined direction relative to the support member, The chair is configured such that, in the stored state, the headrest and the support member can be overlapped in this order from the inside to the outside.

3. A body having a seat surface and capable of being placed on a placement surface; A backrest rotatably attached to the body; a support member attached to the backrest on an inner side on which a seated user is positioned and capable of supporting an upper body of the seated user; the body has recesses on the right and left sides of the body configured to receive the buttocks of a seated user; In a stored state in which the backrest covers the upper part of the seat surface, an outer surface of the backrest covers the right side and the left side of the main body, and the main body and the backrest are configured to have a box shape, In the stored state, the support member is configured to be housed in the recess, The body includes: A seat unit on which the seat is provided; an angle changing mechanism including a grounding member that is disposed on the bottom of the main body and contacts the placement surface to support the seat unit; The ground contact member has a plate-shaped bottom portion formed substantially horizontally so as to cover a bottom surface of the seat unit, and is attached at a rear end portion thereof to be rotatable with respect to the seat unit, The angle change mechanism is configured to position the seat unit relative to the ground contact member such that an angle of the ground contact member relative to the seat unit is changeable between at least a first position and a second position; The angle changing mechanism has an engagement member held by the seat unit, The grounding member has a rising portion formed to rise upward from the bottom portion and a plurality of engagement portions formed on the rising portion, The chair is configured such that the seat unit is positioned relative to the ground contact member by the engaging member being held in an engaged state with any one of the plurality of engaging portions.

4. the angle change mechanism includes a tilt operation unit configured to release the engagement of the engagement member with the ground contact member in response to an operation by an operator, The chair according to claim 3 , wherein the tilt operation unit is arranged so as to be exposed to the outside from the underside of the seat so that an operator can operate it.

5. The chair according to claim 3 or 4, wherein the raised portion is accommodated within either the right side portion or the left side portion.

6. The device further comprises a protruding member configured to be pulled out rearward from a state in which the protruding member is housed inside the body, and capable of being displaced relative to the body so as to protrude rearward from a rear end portion of the body and not protrude rearward from the body; The chair according to claim 1 , wherein the protruding member, when arranged so as to protrude rearward from the rear end of the main body, restricts rearward rotation of the entire main body relative to the placement surface.

7. A body having a seat and capable of being placed on a placement surface; A backrest rotatably attached to the body; a support member attached to the backrest on an inner side on which a seated user is positioned and capable of supporting an upper body of the seated user; the body has recesses on the right and left sides of the body configured to receive the buttocks of a seated user; In a stored state in which the backrest covers the upper part of the seat surface, an outer surface of the backrest covers the right side and the left side of the main body, and the main body and the backrest are configured to have a box shape, In the stored state, the support member is configured to be housed in the recess, The device further includes a protruding member that is configured to be pulled out rearward from a state in which the protruding member is housed inside the main body, and is displaceable relative to the main body so as to protrude rearward from a rear end portion of the main body and not to protrude rearward from the main body, The protruding member, when positioned so as to protrude rearward from the rear end of the main body, restricts rearward rotation of the entire main body relative to the placement surface.

8. an outer surface of the backrest, a right outer surface of the right side portion, and a left outer surface of the left side portion are each flat; The chair according to claim 1 , wherein a right outer surface of the right side portion and a left outer surface of the left side portion are substantially perpendicular to the left-right direction.

9. The chair according to claim 1 , wherein the support member is configured to be slidable in a predetermined direction relative to the backrest.

Images