chair

Abstract

To provide a chair enabling performing pedaling exercise.SOLUTION: A chair includes a seat part, a leg part having a housing space and supporting the seat part, a pedaling unit rotatably including a pair of pedals, and a moving mechanism for moving the pedaling unit between a storage position in a storage space of the leg part and a protruding position outside the storage space. The moving mechanism causes the pedaling unit to move between the storage position in the storage space of the leg part and the protruding position outside the storage space.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a chair. [Background technology]

[0002] Chairs are used in a variety of places, such as homes and offices (see, for example, Patent Document 1). Sitting in a chair for long periods of time can reduce muscle metabolism and blood circulation, potentially harming health. For this reason, it is advisable to engage in moderate exercise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2010-505507 Summary of the Invention [Problem to be solved by the invention]

[0004] However, getting off the chair to exercise is a hassle, and there may not be enough space around the chair to exercise, which means that users who often sit in a chair for long periods of time tend to become inactive.

[0005] This specification discloses a technique that can solve the above-mentioned problems. [Means for solving the problem]

[0006] The technology disclosed in this specification can be realized, for example, in the following forms.

[0007] (1) A chair disclosed in this specification includes a seat, legs having a storage space and supporting the seat, a pedaling unit having a pair of rotatable pedals, and a movement mechanism that moves the pedaling unit between a stored position in the legs within the storage space and a protruding position outside the storage space. In this chair, the movement mechanism allows the pedaling unit to move between a stored position in the storage space of the legs and a protruding position outside the storage space. Therefore, by placing the pedaling unit in the protruding position, pedaling exercise can be performed. On the other hand, when pedaling exercise is not being performed, by placing the pedaling unit in the stored position, it is possible to prevent the pedaling unit from interfering with the feet of a user sitting on the seat, for example.

[0008] (2) In the above chair, the pedaling unit may further include a wheel and a wheel support portion that rotatably supports the wheel, and the pair of pedals may be provided on the wheel so as to be displaceable between a first position extending in the axial direction of the wheel and a second position positioned radially inward of the wheel. In this chair, the pair of pedals are displaceable between the first position, in which pedaling motion is possible, and the second position, in which the pedals are positioned radially inward of the wheel. For example, compared to a configuration in which the pair of pedals cannot be displaced from the first position, interference of the pedals with the legs or the like during movement of the pedaling unit can be suppressed.

[0009] (3) In the above chair, the movement mechanism may include a first slide portion movable relative to the leg portion toward the extended position, and a second slide portion supporting the pedaling unit and movable relative to the first slide portion toward the extended position. In this chair, the pedaling unit is movable between the stowed position and the extended position by a two-stage movement mechanism consisting of the first slide portion and the second slide portion. This allows the movement mechanism to be made smaller when the pedaling unit is in the stowed position, while ensuring a long stroke of the pedaling unit from the stowed position to the extended position, compared to a configuration using a single-stage movement mechanism.

[0010] (4) In the chair, the pedaling unit may have a ring-shaped frame having a groove formed on its inner surface along the entire circumference, and a wheel positioned coaxially with the frame and rotatably disposed within the groove of the frame. According to this chair, the wheel is rotatably disposed within the groove of the ring-shaped frame. This prevents the rotating wheel from being exposed to the outside.

[0011] The technology disclosed in this specification can be realized in various forms, for example, in the form of a chair and a manufacturing method thereof. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 2] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 3] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 4] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 5] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 6]FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to an embodiment. [Figure 7] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a pedaling unit 60 according to an embodiment. [Figure 8] FIG. 1 is an explanatory diagram showing an example of use of the chair 100 according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] A. Implementation: A-1. Composition of chair 100: 1 to 6 are explanatory diagrams that schematically show the configuration of a chair 100 in this embodiment. FIG. 1 shows the front configuration of the chair 100, FIG. 2 shows the back configuration of the chair 100, and FIG. 3 shows the side (right side) configuration of the chair 100. Note that the left side configuration of the chair 100 is the same as the right side configuration of the chair 100, so a drawing showing the left side configuration of the chair 100 is omitted. FIG. 4 shows the top configuration of the chair 100, FIG. 5 shows the bottom configuration of the chair 100, and FIG. 6 is a perspective view of the chair 100 viewed obliquely from below. Each figure shows mutually orthogonal X, Y, and Z axes for specifying directions. The positive Z-axis direction is the upward direction, the negative Z-axis direction is the downward direction, the positive X-axis direction is the leftward direction, the negative X-axis direction is the rightward direction, the positive Y-axis direction is the forward direction, and the negative Y-axis direction is the backward direction.

[0014] Chair 100 is a so-called work chair, and is installed and used in, for example, homes, offices, stores, hotels, public facilities, etc. The height of chair 100 to the seat is, for example, 700 mm or more and 800 mm or less (more specifically, about 750 mm), the width of chair 100 in the left-right direction is, for example, 530 mm or more and 630 mm or less (more specifically, about 580 mm), and the depth of chair 100 in the front-to-back direction is, for example, 500 mm or more and 600 mm or less (more specifically, about 550 mm).

[0015] The chair 100 includes a seat 10, legs 20, a back 30, armrests 40, a support member 50, a pedaling unit 60, and a movement mechanism 70.

[0016] A-1-1. Basic configuration of chair 100: The seat 10 has a seat surface 11 and is a portion that mainly supports the buttocks of a seated person. The seat 10 is configured, for example, by covering the upper surface of a cushion material (not shown) with a cover made of leather or the like.

[0017] The leg section 20 is a member that supports the seat section 10. Specifically, the leg section 20 has an upper frame 202, a lower frame 204, and a plurality of legs 206. The leg section 20 is formed, for example, from a metal (e.g., steel or stainless steel), and the upper frame 202, the lower frame 204, and the legs 206 are integrally formed.

[0018] The upper frame 202 is located above the legs 20 and has a flat plate-like shape. The seat 10 is disposed on the upper surface of the upper frame 202. First guide portions 201 are formed on each of the left and right side surfaces of the upper frame 202 so as to protrude downward (see FIGS. 3 and 6). Each first guide portion 201 has a first guide hole 203 extending in the front-rear direction. A first slide groove 205 extending in the front-rear direction is formed on the underside of the upper frame 202 (see FIGS. 5 and 6). Each of the left and right side portions of the seat 10 and the upper frame 202 has a through hole 207 that penetrates the seat 10 and the upper frame 202 in the up-down direction (see FIGS. 4 and 5). For example, to keep the upper body stable when performing a pedaling exercise (described later), a seated person can insert both hands into the pair of left and right through holes 207 to grip the upper frame 202.

[0019] The lower frame 204 is located below the legs 20 and is the part that comes into contact with the floor surface (not shown) on which the chair 100 is placed. The shape of the lower frame 204 when viewed from the up-down direction is a substantially annular shape with an opening at the front side (see FIG. 5).

[0020] A plurality of legs 206 (three or more, for example, four in this embodiment) connect the upper frame 202 and the lower frame 204. The upper ends of the two right-side legs 206 are joined to the right side of the upper frame 202 at positions different from each other in the front-rear direction. The upper ends of the two left-side legs 206 are joined to the left side of the upper frame 202 at positions different from each other in the front-rear direction. The lower ends of the four legs 206 are joined to the lower frame 204 at positions different from each other in the circumferential direction. The multiple legs 206 are spaced apart from each other in the space between the upper frame 202 and the lower frame 204, thereby forming a storage space S in the leg portion 20. In short, the storage space S is formed in the leg portion 20 so as to be surrounded by the multiple legs 206. The legs 206 are closest to each other at their vertical center portions, with their upper portions extending radially from the center toward the left and right sides of the upper frame 202, and their lower portions extending radially from the center toward the lower frame 204 (see FIGS. 1 and 2). The legs 20 are also provided with a reinforcing portion 208 that connects the centers of the legs 206 and is open at the front.

[0021] The back portion 30 has a backrest surface 31 and is the portion that mainly supports the back of the seated person. The back portion 30 is configured, for example, by covering the entire composite body, in which cushioning material is placed on the front surface of a core material (not shown), with a cover made of leather or the like. The armrest portions 40 are located on both the left and right sides of the back portion 30 and are portions on which the seated person can rest their elbows.

[0022] 2 and 3, the support member 50 is formed of, for example, metal (e.g., steel or stainless steel) and has a pair of first support frames 52, a pair of second support frames 54, and a pair of third support frames 56. The pair of first support frames 52 curve from the rear end of the upper frame 202, extending to and joined to the rear surface of the back 30. The pair of second support frames 54 extend from the middle of the first support frame 52 toward and joined to the rear surface of the back 30. The pair of third support frames 56 extend from the middle of the first support frame 52 so as to protrude in the left-right direction, and an armrest 40 is joined to the tip of each third support frame 56.

[0023] A-1-2. Pedaling unit 60 configuration: FIG. 7 is an explanatory diagram that shows a schematic configuration of a pedaling unit 60 according to an embodiment. FIG. 7 shows an enlarged view of the configuration of the pedals 66 and the vicinity thereof in the pedaling unit 60. The pedaling unit 60 includes a pair of pedals 66 (see FIGS. 3, 6, and 7) that are rotatable circumferentially around a predetermined axis (central axis P in FIG. 8(B) described below). Specifically, the pedaling unit 60 further includes a wheel 62 and a wheel cover 64. The wheel cover 64 is an example of a wheel support portion and a frame as defined in the claims.

[0024] The wheel cover 64 is an annular frame and is made of, for example, metal (such as steel or stainless steel). A groove 63 is formed on the inner peripheral surface of the wheel cover 64 over the entire circumference of the wheel cover 64 (see FIG. 7). The wheel 62 is an annular wheel member and is made of, for example, metal (such as steel or stainless steel). The wheel 62 is arranged coaxially with the wheel cover 64 and is rotatably arranged within the groove 63 of the wheel cover 64. In other words, the outer peripheral surface of the wheel 62 is covered over the entire circumference by the wheel cover 64. Note that, in order to improve the smoothness of rotation of the wheel 62 relative to the wheel cover 64, it is preferable to provide, for example, lubricating oil, bearings, etc. between the outer peripheral surface of the wheel 62 and the groove 63 of the wheel cover 64.

[0025] The pair of pedals 66 are provided on the wheel 62 at positions that are point-symmetrical with respect to the central axis P of the wheel 62 (see FIG. 6 and FIG. 8(B) described below). Each pedal 66 is provided on the wheel 62 so as to be displaceable between a first position (see FIG. 7(B)) in which it protrudes from the wheel 62 in a direction along the central axis P of the wheel 62 (the X-axis direction) and a second position (see FIG. 7(A)) in which it is located radially inward of the wheel 62 and accommodated within the wheel 62. The protruding directions of the pair of pedals 66 in the first positions are opposite to each other. That is, the first position of one pedal 66 is a position in which it protrudes to the right from the wheel 62, and the first position of the other pedal 66 is a position in which it protrudes to the left from the wheel 62.

[0026] Specifically, as shown in FIG. 7, the pedal 66 has a pedal body 67, a pedal connecting portion 68, and a locking portion 69.

[0027] The pedal body 67 is a substantially cylindrical member and includes a pedal shaft portion 67A and a pedal cylinder portion 67B. The pedal shaft portion 67A is a cylindrical member and is made of, for example, a metal (such as steel or stainless steel).

[0028] The pedal cylinder 67B is a substantially cylindrical member into which the pedal shaft 67A is inserted and which is rotatable around the pedal shaft 67A. A flat foot step portion 67C extending in the axial direction of the pedal cylinder 67B is formed on the outer circumferential surface of the pedal cylinder 67B.

[0029] The pedal connecting portion 68 has a movable portion 68A and a fixed portion 68B. The fixed portion 68B is fixed to the inner circumferential surface of the wheel 62. The movable portion 68A has a pair of arms 68C. The distal ends of the pair of arms 68C are rotatable relative to the fixed portion 68B about an axis Q perpendicular to both the radial and axial directions of the wheel 62. The base end of the pedal shaft 67A of the pedal body 67 is fixed to the distal end of the movable portion 68A. This allows the pedal 66 to be displaced between a first position (a position in which the pedal body 67 is aligned along the central axis P of the wheel 62; see FIG. 7(B)) and a second position (a position in which the pedal body 67 is aligned along the radial direction of the wheel 62; see FIG. 7(A)).

[0030] The locking portion 69 is a member for locking the pedal 66 in the first position. Specifically, the locking portion 69 is provided on the tip surface of the fixed portion 68B so as to be rotatable about an axis R in the radial direction of the wheel 62. The outer circumferential portion of the locking portion 69 has a locking portion 69A and a non-locking portion 69B. The distance between the locking portion 69A and the axis R is longer than the distance between the arm 68C and the axis R, and the distance between the non-locking portion 69B and the axis R is shorter than the distance between the arm 68C and the axis R. Therefore, when the non-locking portion 69B is positioned between the pair of arms 68C, the movable portion 68A can be rotated relative to the fixed portion 68B to place the pedal 66 in the first position or the second position (see FIG. 7A). On the other hand, when the pedal 66 is in the first position, if the locking portion 69 is rotated so that the locking portion 69A is positioned between the pair of arms 68C, the locking portion 69A comes into contact with the arms 68C, thereby locking the pedal 66 in the first position (see Figure 7(B)).

[0031] 7(A), when the pair of pedals 66 are in the second position, the flat tip surfaces of the pair of pedal bodies 67 are in surface contact with each other. This makes it possible to suppress the pair of pedal bodies 67 from swinging when the pair of pedals 66 are in the second position, compared to a configuration in which the pair of pedal bodies 67 are spaced apart.

[0032] A-1-3. Configuration of the moving mechanism 70: As shown in FIG. 6 , the movement mechanism 70 includes a slide portion 72, a pair of gripping portions 74, a pair of arm portions 76, a second guide portion 78, and a guide connecting portion 80. The slide portion 72 is a flat plate extending in the front-rear direction and is disposed in a first slide groove 205 of an upper frame 202 so as to be movable in the front-rear direction. The pair of arm portions 76 extend so as to protrude in the left-right direction from each of the left and right side surfaces of the slide portion 72. Each arm portion 76 penetrates a first guide hole 203 of a first guide portion 201, and a gripping portion 74 is provided at the tip of the arm portion 76. The vertical width of the gripping portion 74 is wider than the vertical opening width of the first guide hole 203. Therefore, the arm portion 76 is prevented from coming out of the first guide hole 203 by the gripping portion 74, and is movable in the front-rear direction along the first guide hole 203. With this configuration, the occupant can move the slide portion 72 in the front-to-back direction within the first slide groove 205 by grasping the pair of gripping portions 74 located on the left and right sides of the seat portion 10 and moving them in the front-to-back direction while remaining seated on the seat portion 10.

[0033] The second guide portion 78 is located below the slide portion 72 and is connected to the slide portion 72 via a guide connecting portion 80 (see also FIGS. 2 and 3). The second guide portion 78 is a member that supports the pedaling unit 60 so that it can move in the front-rear direction. The second guide portion 78 has a second guide hole 79. The second guide hole 79 penetrates in the up-down direction, extends in the front-rear direction, and opens forward. The pedaling unit 60 (wheel cover 64) is disposed within this second guide hole 79 so that it can move in the front-rear direction. In FIGS. 1 to 6, the pair of pedals 66 are in the second position, and the pedaling unit 60 is disposed within the second guide hole 79. When the pedaling unit 60 is moved forward, the wheel cover 64 is held and fixed at the tip of the second guide hole 79 (see FIG. 8(B) described below). The slide portion 72 is an example of a first slide portion in the claims, and the wheel cover 64 is an example of a second slide portion in the claims.

[0034] A-2. Example of using Chair 100: FIG. 8 is an explanatory diagram showing a state in which the chair 100 according to the embodiment is in use. FIG. 8(A) shows a state in which the pedaling unit 60 is arranged in a storage position located within the storage space S of the leg portion 20. In this state, the pedaling unit 60 is arranged below the seat portion 10, so that the seated person U can sit on the chair 100 and perform desk work or the like without being concerned about the presence of the pedaling unit 60. The pedaling unit 60 is a wheel type that does not include an axle member and is composed of a wheel 62 and a wheel cover 64. The pair of pedals 66 are in a second position, housed on the inner periphery of the wheel 62, and are therefore hidden by the wheel 62 when viewed from the front-to-rear direction (see FIGS. 1 and 2). Therefore, the annular pedaling unit 60 is externally integrated with the legs 206 of the leg portion 20, resulting in a leg portion 20 (chair 100) with an extremely high level of design quality.

[0035] FIG. 8(B) shows the pedaling unit 60 in a protruding position protruding forward from the storage space S of the leg 20. When the seated person U, while seated, grasps the pair of gripping parts 74 (see FIG. 1, etc.) and pushes them forward from the position shown in FIG. 8(A), the pedaling unit 60 moves forward by the movement mechanism 70. The pedaling unit 60 is then moved forward from the second guide part 78. Next, the pair of pedals 66 are displaced from the second position to the first position. This allows the seated person U to perform a pedaling exercise by placing their feet on the foot-stepping parts 67C of the pair of pedals 66 protruding laterally from the wheel 62 while remaining seated.

[0036] A-3. Advantages of this embodiment: As described above, in the chair 100 according to this embodiment, the movement mechanism 70 allows the pedaling unit 60 to move between a stored position (see FIG. 8(A)) within the storage space S of the leg 20 and a protruding position (see FIG. 8(B)) outside the storage space S. Therefore, the seated person U can perform a pedaling motion by placing the pedaling unit 60 in the protruding position. On the other hand, when not performing a pedaling motion, by placing the pedaling unit 60 in the stored position, it is possible to prevent the pedaling unit 60 from interfering with the feet of the seated person U, for example.

[0037] In this embodiment, the pair of pedals 66 can be displaced between a first position (see FIG. 7(B)) in which pedaling motion is possible and a second position (see FIG. 7(A)) in which the pedals 66 are positioned radially inward of the wheel 62. Therefore, compared to a configuration in which the pair of pedals 66 cannot be displaced from the first position, it is possible to prevent the pedals 66 from interfering with the legs 20 or the like during the movement of the pedaling unit 60, for example.

[0038] In this embodiment, the pedaling unit 60 can be moved between the retracted position and the extended position by a two-stage movement mechanism 70. This makes it possible to reduce the size of the movement mechanism when the pedaling unit 60 is in the retracted position, compared to a configuration that employs a single-stage movement mechanism, while ensuring a long stroke for the pedaling unit 60 from the retracted position to the extended position. Furthermore, the two-stage movement mechanism 70 allows the user to comfortably extend the pedaling unit 60 while seated.

[0039] In this embodiment, the wheel 62 is rotatably disposed within the groove of the wheel cover 64. This prevents the rotating wheel 62 from being exposed to the outside. Furthermore, the pedaling unit 60 has a simple appearance that does not require a shaft member, which prevents the presence of the pedaling unit 60 from adversely affecting the design of the chair 100.

[0040] In this embodiment, the grip 74 is movably disposed on the side of the seat 10, and the movement mechanism 70 is configured to move the pedaling unit 60 between the stowed position and the extended position in conjunction with the movement of the grip 74 (see FIG. 8, etc.). Therefore, the user can grasp the grip 74 and move it while seated, thereby pulling out the pedaling unit 60 from the stowed position. Furthermore, the direction of movement of the grip 74 (front-rear direction) is the same as the direction of movement of the pedaling unit 60, so the force applied by the user to the grip 74 is efficiently reflected in the movement of the pedaling unit 60, allowing for smooth movement of the pedaling unit 60. Moreover, the grip 74 is disposed on each of the left and right side of the seat 10. Therefore, the user can move the grip 74 while maintaining a balanced seated posture.

[0041] B. Variations: The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified into various forms without departing from the spirit thereof, for example, the following modifications are also possible.

[0042] The configuration of the chair 100 in the above embodiment is merely an example and can be modified in various ways. For example, the shape, dimensions, forming materials, and manufacturing method of each part of the chair 100 in the above embodiment are merely an example and can be modified in various ways. Also, in the above embodiment, the chair 100 includes the seat 10, the back 30, and the armrests 40, but the chair 100 does not necessarily have to include the back 30 or the armrests 40.

[0043] In the above embodiment, the leg portion 20 has a highly aesthetic design in which the storage space S is formed so as to be surrounded by a plurality of legs 206, and the storage space S can be seen from a plurality of directions. However, the leg portion 20 may have a design in which the storage space is formed by a peripheral wall that is open at the front end, for example.

[0044] In the above embodiment, the pedaling unit 60 may be configured so that the pedal 66 is always in the first position. Also, in the above embodiment, a wheel-type pedaling unit 60 is exemplified as the pedaling unit, but for example, a type in which the pedal body is provided at the tip of a crank that is rotatable around a rotation axis may also be used.

[0045] In the above embodiment, the moving mechanism 70 is configured to move the pedaling unit 60 between the stored position and the extended position using a two-stage sliding mechanism, but it may also be configured to move the pedaling unit 60 between the stored position and the extended position using a one-stage or three or more stage moving mechanism.

[0046] In the above embodiment, the movement mechanism 70 is arranged at the top of the storage space S of the leg 20 (the bottom surface of the upper frame 202), but the movement mechanism may be arranged at the center in the vertical direction of the storage space S (for example, at the reinforcing part 208) or at the bottom of the storage space S (towards the lower frame 204). Note that the movement mechanism only needs to include at least a slide part that holds the pedaling unit and a guide part that supports the slide part so that it can move in the front-to-rear direction.

[0047] In the above embodiment, the direction of movement of the grip part 74 is the front-rear direction, but it is not limited to this and may be, for example, another linear direction (up-down direction, diagonal direction), or even a rotational direction. In the latter case, the pedaling unit is configured to move in conjunction with the rotational operation of the grip part 74. [Explanation of symbols]

[0048] 10: Seat 11: Seat surface 20: Legs 30: Back 31: Backrest surface 40: Armrest 50: Support member 52: First support frame 54: Second support frame 56: Third support frame 60: Pedaling unit 62: Wheel 63: Groove 64: Wheel cover 66: Pedal 67: Pedal body 67A: Pedal axle 67B: Pedal cylinder 67C: Foot step 68: Pedal connecting portion 68A: Movable portion 68B: Fixed portion 68C: Arm 69: Locking portion 69A: Locking portion 69B: Non-locking portion 70: Moving mechanism 72: Slide portion 74: Grip portion 76: Arm portion 78: Second guide portion 79: Second guide hole 80: Guide connecting portion 100: Chair 201: First guide portion 202: Upper frame 203: First guide hole 204: Lower frame 205: First slide groove 206: Leg 207: Through hole 208: Reinforcement part P: Central axis Q, R: Axis S: Storage space U: Seated person

Claims

1. A seat and a leg portion having an accommodation space and supporting the seat portion; a pedaling unit including a pair of rotatable pedals; a movement mechanism that moves the pedaling unit in a first direction between a stored position in the storage space of the leg and a protruding position outside the storage space; Equipped with The pedaling unit has an annular frame having a groove formed on its inner circumferential surface along the entire circumference, and a wheel rotatably disposed within the groove, the pair of pedals are provided on the wheel so as to be displaceable between a first position extending in an axial direction of the wheel and a second position in which the pedals are positioned radially inward of the wheel and the pedals and the wheel overlap when viewed in the radial direction; Each of the pair of pedals has a pedal connecting portion that is disposed on an inner circumferential surface of the wheel and that is capable of displacing the pedal between the first position and the second position; the moving mechanism has a first slide portion provided to be movable in the first direction relative to the leg portion, and a second slide portion supporting the pedaling unit and provided to be movable in the first direction relative to the first slide portion, and guides the pedaling unit from the stored position to the extended position. chair.

2. 2. The chair of claim 1, the first slide portion further includes a grip portion; The gripping portion is provided so as to be able to move the first sliding portion in the first direction. chair.

3. 3. The chair according to claim 1 or claim 2, a second guide portion that movably supports the second slide portion and is connected to the first slide portion; In the second position, the axial width of the wheel having the pair of pedals is smaller than the width of the guide hole of the second guide portion. chair.

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