JP2020049117A - Chair - Google Patents

Abstract

To provide a chair equipped with a suitable structure for preventing a seat body from coming off of a seat support.SOLUTION: A chair includes a seat 3 which has a seat body B and a seat inner shell A to be a seat support that can support the seat body B in its use state in the way that it is slidable between a front position and a rear position. The seat body B can be fitted to the seat outer shell A only at a fitting position. The seat 3 is provided with an operation member C which is supported by the seat body B and can put the seat body B in the state that it is slidable in the back and forth direction of the seat outer shell A. The operation member C is provided with a movement regulation part 36c which interacts with the seat outer shell A and regulates the seat body B so that it cannot slide to the fitting position.SELECTED DRAWING: Figure 19

Description

  The present invention relates to a chair used in an office or the like.

  Conventionally, various chairs that are suitably used in offices and the like are known (for example, see Patent Literature 1).

  This type of chair includes a seat having a seat body having a seating surface on an upper surface and a seat capable of supporting the seat body so as to be slidable between a front position and a rear position. The seat body of the chair after completion of the assembly is configured to be inseparable from the seat receiver.

  In a conventional seat, a retaining member is attached to the seat support in order to hold the seat body with respect to the seat support. The retaining member attached to the seat support engages with a slit provided in the seat main body to position the seat main body and prevent the seat main body from being detached from the seat support. The retaining member is separate from the seat, and the plurality of retaining members are attached to the seat with screws.

  However, with such a configuration, inevitably, a plurality of retaining members that are separate from the seat, and a plurality of screws and the like for attaching the plurality of retaining members are manufactured, prepared, and , Have to manage. In addition, man-hours for attaching the plurality of retaining members to the seat receiver can inevitably occur.

  In other words, in the conventional system, the number of parts must be increased to prevent the seat body from coming out of the seat receiver, and the rationalization of processes such as parts manufacturing, parts management, and assembly work is inevitable. Was one of the causes of damage.

JP-A-08-105415

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chair having a suitable structure for preventing a seat body from coming out of a seat support.

  That is, the chair of the present invention has the following configuration.

  The invention according to claim 1 includes a seat having a seat body having a seating surface on an upper surface, and a seat receiver capable of slidably supporting the seat body between a front position and a rear position in a usable state. Wherein the seat body can be attached to the seat receiver only at an attachment position set before the front position or after the rear position, and the seat is An operating member supported by the seat body and capable of sliding the seat body in the front-rear direction with respect to the seat receiver is provided, and the operating member engages with the seat receiver to attach the seat body to the seat. It is a chair provided with a movement restricting portion that restricts the position from sliding.

  The invention according to claim 2, wherein the operating member is supported so as to be vertically movable between an upper position and a lower position with respect to the seat body, and when the operating member is at the upper position, the seat body is moved relative to the seat receiver. 2. The chair according to claim 1, wherein the chair can be slid in the front-rear direction.

  The invention according to claim 3, wherein the operating member includes an engaging member provided with an engaging portion that selectively engages with a plurality of engaged portions provided on the seat when the operating member is at the lower position. 3. The chair according to claim 2, further comprising an operation end member attached to a lower end portion of the engagement member, wherein the movement restriction portion is provided on the operation end member.

  The invention according to claim 4 is characterized in that the seat body includes an inner shell made of a synthetic resin, and a cushion material disposed on the inner shell, wherein the inner shell is attached to the seat support. It is provided with a guide slit extending in the front-rear direction in which the provided stopper projection can be engaged, the guide slit being capable of supporting the stopper projection relatively movably and undetachably, and after the main slit. Provided with an insertion / removal hole configured to allow insertion / removal of the retaining projection, so that the retaining projection can be located in the insertion / removal hole when the seat body is in the mounting position. The chair according to claim 1, 2 or 3, wherein the chair is provided.

  The invention according to claim 5 is characterized in that the retaining projection has an upright portion which can be located in the main slit, and a retaining portion provided at an upper end of the upstanding portion and formed wider than the main slit. The chair according to claim 4, wherein

  The invention according to claim 6 is characterized in that the seat body is configured to be insertable / removable with respect to the seat receiver only at the mounting position set before the front position, and A part thereof can slide in the front-rear direction in the seat receiving slit provided in the seat support in conjunction with the seat main body, and the movement restricting portion of the operation end member at the front position has the The chair according to claim 1, 2, 3, 4, or 5, wherein the chair can be brought into contact with the locking portion provided on the chair.

  The invention according to claim 7 is characterized in that the seat body is configured to be able to be inserted into and removed from the seat receiver only at the mounting position set after the rear position. The part can slide forward and backward in the seat receiving slit provided in the seat support in conjunction with the seat body, and the movement restricting portion of the operation end member at the rear position is attached to the seat support. The chair according to claim 1, 2, 3, 4, or 5, wherein the chair can contact the provided locking portion.

  The invention according to claim 8 is characterized in that the seat body includes an inner shell made of a synthetic resin and a cushion material disposed on the inner shell, and the operation member is formed by the cushion material. The chair according to claim 1, 2, 3, 4, 5, 6, or 7, which is biased downward and is located at the lower position in a non-operation state.

  According to a ninth aspect of the present invention, the seat support includes a seat main body and a plurality of retaining projections projecting upward from the seat main body. The chair according to claim 1, 2, 3, 4, 5, 6, 7, or 8, which is integrally formed of a synthetic resin.

  As described above, according to the present invention, it is possible to provide a chair having a suitable structure for preventing the seat body from coming out of the seat receiver.

FIG. 1 is a perspective view showing a first embodiment of the present invention. The right view in the embodiment. The front view in the embodiment. The rear view in the embodiment. The top view in the embodiment. The bottom view in the same embodiment (leg is omitted). The exploded perspective view in the embodiment. Exploded right side view in the same embodiment. The longitudinal section in the embodiment. The exploded perspective view in the embodiment. The rear view of the back inner shell in the embodiment. The back view of the upholstery in the embodiment. The rear view in the embodiment. FIG. 14 is a schematic sectional view taken along line X-X in FIG. 13. The front view in the embodiment (upholstery is omitted). Rear view in the same embodiment (upholstery is omitted). The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. FIG. 2 is an exploded perspective view partially enlarged in the embodiment. FIG. 3 is an exploded perspective view of the operation member according to the embodiment. FIG. 3 is a left-right central cross-sectional view of the seat in the same embodiment (a state in which a seat body is at a rear position). FIG. 3 is a left-right central end view of the seat in the same embodiment (a state where the seat body is at a front position). FIG. 4 is a vertical cross-sectional view of a central portion in the left-right direction in which a concave portion of a seat cushion in the embodiment can be displayed (a state in which a seat body is at a rear position). The front-back direction center sectional view of the seat in the same embodiment. The bottom view of the seat main body in the embodiment. The bottom view of the seat cushion in the embodiment. FIG. 3 is a partially enlarged plan view of a seat outer shell in the embodiment. FIG. 4 is a partially enlarged plan view of the seat outer shell in a state where the operation member according to the embodiment is arranged. FIG. 3 is a partially enlarged plan view of the same embodiment (a state where a seat body is at a rear position). FIG. 3 is a partially enlarged plan view of the same embodiment (a state where a seat body is at a front position). FIG. 3 is a partially enlarged bottom view of the same embodiment (a state where a seat body is at a front position). FIG. 3 is a partially enlarged plan view of the same embodiment (a state in which a seat body is at a mounting position). The perspective view in the embodiment. The perspective view in the embodiment. The perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. FIG. 3 is a partially enlarged front view showing a position where the engagement member can be inserted and an engagement position in the embodiment in comparison. The exploded perspective view in the embodiment. The top view in the embodiment. The top view in the embodiment. The top view in the embodiment. The top view in the embodiment.

  One embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the present invention is applied to a chair which is an office swivel chair suitably used in an office or the like.

  The chair is configured such that the armrest 6, optional hangers 7, and headrests 8 can be attached to the chair body. The chair body includes a leg 1, a support base 2, a seat 3, a back support 4, and a backrest 5.

  In the chair, the seat 3 and the backrest 5 are supported by the support base 2 and the back support 4 so as to be capable of being synchronized. The chair is configured to be able to perform a rocking operation between a standard posture shown in FIG. 2 and a rearwardly inclined posture (not shown) in which the seat 3 and the backrest 5 are inclined backward from the standard posture. A lower front portion of the seat 3 of the chair is rotatably supported by the support base 2, and a lower rear portion of the seat 3 is rotatably supported by the back support 4.

  The chair has a leg 1, a support base 2 attached to the upper end of the leg 1 so as to be able to turn horizontally, a seat 3 disposed on the support base 2, and a lower end rotatably supported by the support base 2. A back support 4, a backrest 5 attached to the back support 4, left and right armrests 6 attached to the lower surface of the seat 3, and a hanger 7 detachably attached to the back side of the backrest 5. , A headrest 8 attached to the backrest 5.

  Hereinafter, this chair will be described in detail.

<< Leg 1 >>
The leg 1 includes a plurality of leg blades 11 each having a caster at a lower end, and a leg support 12 standing up from a portion where the upper ends of the leg blades 11 gather. The leg support 12 is configured to be able to expand and contract in the vertical direction.

<< Support base 2 >>
The support base 2 is capable of rotatably supporting the lower front portion of the seat 3 and rotatably supporting the base end of the back support 4. The support base 2 is mainly composed of a metal member rigidly connected to the upper end of the leg support 12, and its outer surface is covered with a cover made of synthetic resin.

<< seat 3 >>
The seat 3 is arranged on the support base 2. The seat 3 is a shell-shaped seat outer shell A formed of a synthetic resin, and a seat outer shell A. The seat 3 is supported on the seat outer shell A so as to be slidable in the front-rear direction with respect to the seat outer shell A. The seat body B, which is supported to be vertically movable between an upper position and a lower position with respect to the seat body B, can position the seat body B at a predetermined position of the seat outer shell A when in the lower position, and An operating member C is provided which is capable of releasing the seat body B from the seat outer shell A in the front-rear direction when the position of the seat outer shell A is restricted.

  When the seat body B is at the rear position (r), the seat 3 is located between the lower surface at the center of the seat body B, ie, the downward surface 33f, and the upper surface at the center of the outer shell A, ie, the upward surface 31e. A seat flexure permissible space D, which is a flexure permissible space capable of permitting downward flexure of the main body B, is formed.

<Seat outer shell A>
The seat outer shell A has a shell shape having a size capable of supporting the seat body B at an upper portion. The seat outer shell A can slide the seat body B between a front position (f), which is the frontmost position, and a rear position (r), which is the last position, in a usable state, that is, a state where the assembly of the seat 3 is completed. It is supportable. The seat outer shell A has a front portion pivotally attached to the support base 2, and a rear portion pivotally attached near the base end of the back support 4. When the chair is in a usable state, the front position (f) of the seat body B is the slidable front position, and the rear position (r) of the seat body B is the slidable last position.

  The seat outer shell A includes a seat outer shell body 31 serving as a seat receiving body having a shell shape capable of supporting the seat body B at an upper portion, and a plurality of, ie, four, stoppers projecting upward from the seat outer shell body 31. And a projection 32. The seat outer shell main body 31 and the retaining projection 32 are formed integrally.

[Seat outer shell body 31]
The seat outer shell body 31 has a recess in which the engaging portion 35b of the operating member C at the lower position is selectively engaged with the upper surface of the right side (the right side as viewed from the front and the left side as viewed from the occupant) at the front. A plurality of engaged portions 31a having a shape are juxtaposed in the front-rear direction. The engaged portion 31a has a concave shape that is recessed downward and opened upward. The operating member C related to the engaged portion 31 is pressed by the seat cushion 34 from above. The engaging portion 35b provided on the operating member C is securely engaged with the engaged portion 31a recessed downward by utilizing the elastic biasing force of the seat cushion 34 and the weight of the occupant. The seat outer shell main body 31 is provided with a seat receiving slit 31b that penetrates vertically and extends in the front-rear direction substantially parallel to the plurality of engaged portions 31a arranged in the front-rear direction. In the seat receiving slit 31b, a part of the operation member C that can move back and forth integrally with the seat body B, that is, an intermediate portion in the vertical direction can be located. A front end portion of the seat receiving slit 31b is a locking portion 31c with which the movement restricting portion 36c of the cap 36, which is an operation end member of the operation member C, can abut. Only when the seat body B supporting the engaging member 35 of the operating member C is mounted to the seat outer shell A at the front portion of the seat receiving slit 31b, in other words, the seat body B is positioned at the mounting position (t). Only when the operation is performed, there is provided a wide portion 31d into which the lower portion of the engagement member 35 of the operation member C can be inserted from top to bottom.

  The seat outer shell main body 31 includes an upwardly facing surface 31e which is a lower surface side that forms a seat bending allowable space D for allowing downward bending of the seat main body B at a central portion in the front-rear direction and the left-right direction in plan view. ing.

[Retaining projection 32]
The retaining projection 32 has a substantially T-shaped appearance when viewed from the front and is erected on the seat outer shell main body 31. The retaining protrusion 32 can support the seat body B so as not to be detachable from the seat outer shell A by engaging with the seat inner shell 33 of the seat body B, and can slide the seat body B back and forth with respect to the seat outer shell A. Can be positioned at The retaining projections 32 are provided upright at two locations on the left and right at the front of the seat outer shell main body 31 and at two locations on the right and left at the rear of the seat outer shell main body 31. The retaining projection 32 is formed integrally with the seat outer shell body 31 by a synthetic resin.

  The retaining projection 32 is provided at the upper end of the upright portion 32a in a usable state and in a columnar upright portion 32a which can be located in the main slit 33b of the guide slit 33a of the seat inner shell 33, and is formed by the upright portion 32a. And a retaining portion 32b formed to be wider than the main slit 33b in the guide slit 33a of the seat inner shell 33. The width of the retaining portion 32 b is set smaller than the opening width of the insertion / removal hole 33 c provided in the seat inner shell 33.

<Seat body B>
The seat body B has a seating surface on the upper surface. The seat body B includes a shell formed of a synthetic resin, that is, a seat inner shell 33 as an inner shell, a seat cushion 34 as a cushion material disposed on the seat inner shell 33, and an outer surface of the seat cushion 34 and the seat inner shell 33. And a skin material (not shown) that covers the periphery of the outer surface.

[Seat inner shell 33]
The seat inner shell 33 has a substantially rectangular shape in plan view and plays a role of supporting the load of the occupant evenly. The seat inner shell 33 has a plurality of guide slits 33a provided in the seat outer shell A and extending in the front-back direction with which the retaining projections 32 can be engaged, and a plurality of recesses 34a of the seat cushion 34 provided in the center part in the front-back direction. There is provided a slit 33d at the center of the seat, which is a slit provided, and an operation member holding hole 33e capable of supporting the operation member C so as to be able to move up and down and not to come out downward.

  The guide slit 33a is provided with a main slit 33b associated with the retaining protrusion 32 of the seat outer shell A so as to be relatively movable in the front-rear direction and cannot be detached, and a position adjacent to the main slit 33b, that is, provided after the main slit 33b. And an insertion / removal hole 33c configured to be insertable / removable.

  In the chair of this embodiment, as shown in FIG. 32, only when the seat body B is at the mounting position (t), the retaining projection 32 of the seat outer shell A is located in the insertion hole 33c of the seat inner shell 33. I am getting it. In other words, only when the seat body B is positioned at the mounting position (t) located further forward than the front position (f) with respect to the seat outer shell A, the retaining projections 32 match the insertion / removal holes 33c. The seat body B can be attached to the seat outer shell A, and the seat body B can be detached from the seat outer shell A.

  When only the engagement member 35 constituting the operation member C is supported by the seat inner shell 33, the seat body B can be moved to the mounting position (t). After the cap 36 is mounted on the member 35, the movement restricting portion 36c provided on the cap 36 acts to prevent the seat body B from being located at the mounting position (t).

  The seat center slit 33d extends in the front-rear direction. A plurality of seat center slits 33d are provided in parallel with a predetermined interval in the left-right direction. Each seat center slit 33d is parallel to another adjacent seat center slit 33d and is set to have substantially the same length. A concave portion 34a is provided on the lower surface of the seat cushion 34 mounted on the seat inner shell 33 at a position corresponding to the seat central slit 33d.

  The operation member holding hole 33e is provided to penetrate vertically. The operation member holding hole 33e is provided on one side of a front portion of the seat inner shell 33, that is, on the right side in front view (left side as viewed from a seated person). The operation member holding hole 33e has a substantially cruciform shape corresponding to the form of the operation member C so that the operation member C can move up and down. The operation member holding hole 33e is set in a shape such that the retaining head 35c formed at the upper end of the engagement member 35 constituting the operation member C cannot pass downward.

  The seat inner shell 33 is provided with a downward surface 33f which is an upper surface side that forms a seat flexure allowable space D for allowing downward flexure of the seat body B at a central portion in the front-rear direction and the left-right direction when viewed from the bottom. I have.

[Seat cushion 34]
The seat cushion 34 is made mainly of a foam material. The seat cushion 34 is formed of a urethane foam material. A seat inner shell 33 which is a shell for supporting the seat cushion is attached to a lower surface of the seat cushion.

  The seat cushion 34 has a plurality of concave portions 34a that are opened downward corresponding to the seat center slits 33d provided in the seat inner shell 33 on the lower surface side.

  The plurality of recesses 34a are provided in the same number corresponding to the plurality of seat center slits 33d provided in the seat inner shell 33. At least a part of each recess 34a is set to match with each seat central slit 33d of the seat inner shell 33. The position in the left-right direction of each concave portion 34a is formed at a position substantially matching with each seat central portion slit 33d of the seat inner shell 33 in bottom view. When the occupant sits on the seat 3, the air in each concave portion 34a is pushed downward by the deformed seat cushion 34, passes through each seat central slit 33d of the seat inner shell 33, and is discharged to the outside. It has become.

  On the lower surface side of the seat cushion 34, an operation member urging portion that can urge the operation member C downward by utilizing the elasticity of the seat cushion 34 itself at a position corresponding to the operation member C supported by the seat inner shell 33. 34b are formed. The operation member C is constantly pressed downward by receiving the elastic urging force of the seat cushion 34 disposed on the operation member C. Since the relative positions of the seat cushion 34 and the seat inner shell 33 constituting the seat body B and the operating member C in the front-rear direction do not change, the operating member urging portion 34b can be set. .

<Operation member C>
The operation member C can position the seat body B supported by the seat body B and slidable in the front-rear direction with respect to the seat outer shell A at a specific position. The operation member C is supported by the seat body B and is configured to be vertically movable between an upper position and a lower position. The operating member C is urged downward by the seat cushion 34 having elasticity, and is located at the lower position in the non-operating state. The operating member C includes an engaging member 35 having an engaging portion 35b that selectively engages with a plurality of engaged portions 31a provided on the seat outer shell A when in the lower position. And a cap 36, which is an operation end member, attached to the lower end of the.

[Engaging member 35]
The engaging member 35 is a plate-shaped engaging member main body 35a extending in the up-down direction, and extends in a cantilever manner from the engaging member main body 35a, and a front end portion engages with the engaged portion 31a of the seat outer shell A. The engaging portion 35b, the retaining head 35c provided at the upper end of the engaging member main body 35a wider than the engaging member main body 35a, and the peripheral edge of the seat receiving slit 31b of the seat outer shell A are engaged. A regulating projection 35d that defines the upper position of the operation member C, that is, the upper limit position when the operation member C moves upward, and engages with a cap 36 provided at the lower end of the engaging member main body 35a to engage the cap 36 with the engaging member 35. And a cap engaging claw 35e to be connected. A part of the engaging member 35, that is, an intermediate portion in the vertical direction of the engaging member 35 is located in a seat receiving slit 31 b provided in the seat outer shell A. When the seat body B is moved back and forth, the engaging member 35 moved to the upper position by the user's operation is guided by the seat receiving slit 31b in conjunction with the sliding movement of the seat body B and can move back and forth. It has become.

[Cap 36]
The cap 36 has a cap body 36a having an engaged portion 36b that engages with a cap engaging claw 35e of an engaging member 35 on an inner side, and a seat in the seat outer shell A protruding forward on the front side of the cap body 36a. There is provided a movement restricting portion 36c that engages with the locking portion 31c, which is the front end of the receiving slit 31b, and restricts the engagement seat body B from being slid to the mounting position (t).

  The engaged portion 36b of the cap body 36a is in the form of a bridge plate. When the cap 36 is mounted on the engaging member 35, the engaged portion 36b is temporarily elastically deformed. It can be engaged with the claw 35e.

  The movement restricting portion 36c has a columnar shape protruding forward from the cap body 36a. The width dimension of the movement restricting portion 36c is set to a width dimension that can be located in the seat receiving slit 31b.

  When assembling the seat 3, the seat body B supporting the engagement member 35 can be attached to the seat outer shell A at the attachment position (t). On the other hand, at the mounting position (t), the cap 36 constituting the operating member C is obstructed by the movement restricting portion 36c (the movement restricting portion 36c interferes with the seat outer shell A) and the cap 36 is engaged with the engaging member 35. Can not be attached to The seat body B (in a state where the engaging member 35 is supported) attached to the seat outer shell A at the attachment position (t) is then slid backward to move the front position (f) and the rear position (r). ), The cap 36 can be properly attached to the engagement member 35. After the cap 36 is attached to the engagement member 35, the movement restricting portion 36c of the cap 36 comes into contact with the locking portion 31c of the seat outer shell A when the seat body B is at the front position (f). , No further movement is possible. That is, the movement restricting portion 36c of the cap 36 acts to restrict the movement of the seat body B further forward than the front position (f), and as a result, the seat body B moves beyond the front position (f). It cannot move to the mounting position (t).

<Seat deflection allowable space D>
The seat body B includes a seat cushion 34 and a seat inner shell 33 in contact with the lower surface of the seat cushion 34. The seat body B is supported on the seat outer shell A so as to be slidable in the front-rear direction. When the seat body B is at the predetermined position, specifically, as shown in FIGS. 21 and 23, when the seat body B is at the rear position (r), the position between the seat body B and the seat outer shell A is changed. In addition, a seat deflection allowable space D that allows the seat inner shell 33 to bend downward is formed.

  That is, the seat outer shell main body 31 is provided with an upward surface 31e at the center in the front-rear direction and the left-right direction in plan view. The seat inner shell 33 has a downward surface 33f at the center in the front-rear direction and the left-right direction. The upward surface 31e of the seat outer shell body 31 and the downward surface 33f of the seat inner shell 33 are separated from each other. The seat 3 defines a space between the upward surface 31e and the downward surface 33f as a seat deflection allowable space D. As shown in FIG. 22, when the seat body B is at the front position (f), the lower part of the seat body B is located in the seat deflection allowable space D in the no-load state, so that the seat deflection allowable space D is almost completely lost. It will not be formed.

  In the chair of this embodiment, the seat body B can be mounted on the seat outer shell A only at the mounting position (t) set before the front position (f). That is, only when the seat body B is at the mounting position (t), the retaining projection 32 provided on the seat outer shell A can pass through the insertion / removal hole 33c of the guide slit 33a. When the seat body B is mounted on the seat outer shell A, the engaging member 35 of the operating member C is held in the operating member holding hole 33e of the seat inner shell 33 in advance. The lower part of the engaging member 35 supported by the seat body B can pass through the wide portion 31d of the seat receiving slit 31b only when the seat body B is at the mounting position (t).

  Even when the retaining projections 32 of the seat outer shell A pass through the insertion / removal holes 33c of the seat body B, when the seat body B is at the mounting position (t), the cap 36 is not engaged with the engaging member 35. It cannot be attached. For this reason, the cap 36 is attached to the engagement member 35 after the seat body B is slid rearward to be positioned between the front position (f) and the rear position (r). In other words, the cap 36 can be attached to the engagement member 35 only when the seat body B is in the normal movable position in the usable state, ie, between the front position (f) and the rear position (r). It has become. The engaged portion 36b of the cap 36 is in the form of a bridge plate, and is engaged with the cap engaging claw 35e of the engaging member 35 through temporary elastic deformation. That is, the seat body B is mounted on the seat outer shell A, and thereafter, the seat body B is retracted to be positioned between the front position (f) and the rear position (r), and the cap 36 faces the engagement member 35. When pressed, the cap 36 is relatively easily attached to the engagement member 35 in a manner that the cap 36 is difficult to be detached.

<< back support 4 >>
The back support 4 supports the backrest 5. The back support 4 has a single columnar shape in rear view. The back support 4 is connected to an upper portion and a lower portion of the backrest 5 at an intermediate portion in the left-right direction. The portion of the back support 4 located on the rear side of the backrest 5 is located at the middle part of the backrest 5 in the left-right direction in rear view.

  The back support 4 includes a lower back frame 41 connected to the support base 2 and an upper back frame 42 rotatably supported by the lower back frame 41. The lower back frame 41 has a lower end rotatably supported by the support base 2. The lower back frame 41 supports the rear end of the seat outer shell A near the lower end. The lower back frame 41 supports the upper back frame 42 at the upper end so as to be rotatable in the front-rear direction, and is connected to the lower end of the backrest 5. The upper end of the upper back frame 42 is connected to the upper part of the backrest 5. In addition, a hanger 7 described later is attached to the back outer shell E of the backrest 5 in detail. The hanger 7 is attached to a portion of the back outer shell E that is connected to the back support 4. The connecting portion 72f of the hanger body M is curved so as to project rearward so as to form a gap sk with the upper back frame 42. The connecting portion 72f of the hanger main body M is arranged behind the back support 4 so as to be separated from the back support 4, and is used when the entire chair is moved with respect to the floor. It can function as a handle.

<< Backrest 5 >>
The backrest 5 includes a back plate formed of a synthetic resin in a shell shape, that is, a back outer shell E serving as a back plate, and a back plate formed of a synthetic resin in a shell shape and disposed on the front side of the back outer shell E, that is, a front back plate. The lumbar supporter 55, which is slidably attached to the inner back shell F and the outer back shell E in the left-right direction and is a part of the inner back shell F, is pressed later to exhibit a predetermined lumbar support function. It comprises left and right push members G and a backing material H for covering the back inner shell F and the headrest 8. Between the back inner shell F and the back outer shell E, there is provided a back flexure permissible space I which is a flexure permissible space capable of permitting the back inner shell F to flex backward. The back outer shell E is set to have higher rigidity than the back inner shell F. Since the back inner shell F is thinner than the back outer shell E, the degree of elastic deformation when receiving a load is set higher than that of the back outer shell E.

  Note that the description of the upholstery H is mainly made with reference to FIGS. 1 to 5, FIG. 10, and FIGS. 12 to 14, and in other drawings, the upholstery H is omitted for convenience of description. There is.

<Back outer shell E>
The back outer shell E is made of a synthetic resin having a plate shape and supporting the back inner shell F. The back outer shell E is formed in a shape protruding forward in a side view, that is, in a U shape. The back outer shell E has a curved shape so as to project rearward in plan view. The back outer shell E is provided with an engaging claw 52 serving as an upper mounting portion and a fitting recess 51b serving as a lower mounting portion for supporting the back inner shell F at each of the upper and lower portions.

  The back outer shell E engages with a rectangular plate-shaped back outer shell main body 51 having a size capable of supporting the back of the seated person P from the rear, and an upper mounting portion protruding from the back outer shell main body 51. And a claw 52.

[Back outer shell body 51]
The back outer shell main body 51 is provided with a plurality of through holes 51a for improving design, improving air permeability, or facilitating elastic deformation. The plurality of through-holes 51a are horizontally elongated holes penetrating in the front-rear direction. The plurality of through holes 51 a are provided in an upper portion of the back outer shell main body 51. In the back outer shell body 51, the degree of vertical and horizontal separation of the adjacent through holes 51a in the upper part is set lower (shorter) than the degree of vertical and horizontal separation of the adjacent through holes 51a in the lower part. ing. For this reason, the back outer shell main body 51 produces a gradation of appearance. Further, since the back outer shell body 51 is provided with a plurality of through holes 51 a around a portion held by the back support 4, the back outer shell body 51 suppresses excessive deformation of the back outer shell body 51 while changing its appearance and breathability. Can be improved.

  As will be described later, the chair uses the plurality of through holes 51a provided in the back outer shell E so that the optional hanger 7 can be mounted on the back outer shell E only by a mounting operation from the back side by the user. It is configured. On the lower front surface side of the back outer shell main body 51, there is provided a fitting concave portion 51b as a lower mounting portion to which a fitting protrusion 53e projecting from the lower back surface of the back inner shell F can be fitted. The hanger 7 is attached to the back outer shell E, which is excellent in strength, in the vicinity of the connection with the back support 4.

[Engagement claw 52]
The engagement claws 52 constituting the upper attachment portion are engaged with the back inner shell F to support the upper portion of the back inner shell F. A plurality of engaging claws 52 are provided at an upper portion on the front side of the back outer shell main body 51. More specifically, the engagement claws 52 are provided at four locations with an interval in the left-right direction. The engaging claw 52 has an L-shaped hook shape which is inserted into and engaged with the engaging hole 53c provided in the back inner shell F from the rear side. The engagement claw 52 includes a base end 52a protruding forward from the back outer shell main body 51, and an upper extension 52b extending upward from the front end of the base end 52a. The upper end of the upper extension portion 52b is located above the upper edge of the back outer shell body 51 in rear view.

  As will be described later, the back inner shell F has a protruding portion 53j that protrudes upward from the upper end edge of the back outer shell main body 51 in rear view. For this reason, the position of the engaging claw 52 is positioned above the back outer shell E until the upper end of the engaging claw 52 engaged with the back inner shell F can be positioned above the back outer shell body 51. As a result, the upper portion including the protruding portion 53j of the back inner shell F can be stably supported.

<Back inner shell F>
The back inner shell F is made of a plate-shaped synthetic resin. The back inner shell F has a size capable of supporting the back of the seated person P from behind. The back inner shell F is formed in a shape protruding forward in a side view, that is, in a U shape. The back inner shell F has a curved shape so as to project rearward in plan view.

  The back inner shell F includes a back inner shell body 53 that is a front back plate body having a substantially rectangular outer peripheral edge in front view, a leaf spring portion 54 protruding rearward from a central portion of the back inner shell body 53, A lumbar supporter 55 is provided at a position corresponding to the waist of the occupant below the leaf spring portion 54 and supported by the back inner shell body 53 via a band-shaped connecting member 56.

  The lumbar supporter 55 is pressed from the rear by a pushing member G supported to be slidable in the left-right direction with respect to the back outer shell E.

  In the present embodiment, the back inner shell main body 53, the leaf spring portion 54, the connecting member 56, and the lumbar supporter 55 are integrally formed of a synthetic resin.

[Back inner shell body 53]
The back inner shell main body 53 has an outer edge shape similar to the back outer shell E. The back inner shell main body 53 has an opening 53a that forms a region where the lumbar supporter 55 is arranged.

  On the back side of the back inner shell main body 53, positioning projections 53b are provided along the left and right side edges of the back inner shell main body 53. In other words, the positioning projections 53b are disposed on the left and right side ends of the back inner shell main body. The positioning projections 53b are substantially parallel to the left and right side edges of the back inner shell main body 53, and are provided continuously in the vertical direction. The positioning projection 53b is provided on the back side of the back inner shell main body 53 at a position on the center side in the left-right direction from the side edge of the back inner shell F. The positioning projection 53b may be provided on the side edge of the back inner shell F, or may be provided intermittently instead of being continuous in the vertical direction.

  In the upper part of the back inner shell main body 53, a plurality of square-shaped engaging holes 53c penetrating in the front-rear direction and extending in the vertical direction when viewed from the front are provided side by side in the left-right direction. The engagement holes 53c are provided corresponding to the engagement claws 52 of the back outer shell E. The engaging claw 52 of the back outer shell E is inserted into the engaging hole 53c from the rear side during attachment.

  In the upper part of the back inner shell main body 53, a plurality of hook holes 53d having a convex shape penetrating in the front-rear direction are provided side by side in the left-right direction. The hook hole 53d is for engaging the hook portion 58a of the upper reinforcing member 58 provided on the upholstery H.

  On the back side of the lower part of the back inner shell main body 53, a fitting projection 53e is provided which fits into a fitting recess 51b provided in the back outer shell E.

  The back inner shell main body 53 is provided with positioning holes 53f used when the headrest 8 is mounted on each of the left and right of the middle part in the vertical direction. When the chair is not equipped with the headrest 8, that is, when the positioning hole 53f used to support the headrest 8 is not used, the positioning hole 53f is closed by the closing plate 53g. 7 to 9 show the state in which the closing plate 53g is displayed for convenience of explanation. In addition, the chair in this embodiment can be equipped with the headrest 8 only when a low back type (LB) is used as the back inner shell F, as shown in FIGS. 15 and 16. When a high back type (HB), which is taller than a low back type (LB), is adopted as the back inner shell F, the headrest 8 cannot be mounted. Therefore, FIGS. 10, 11, 13, and 15 (b) showing the back inner shell F of the high back type (HB) do not have the positioning holes 53f and the closing plates 53g. .

[Leaf spring part 54]
The leaf spring portion 54 is provided integrally with the back inner shell main body 53 which can move rearward under the load of the seated person. The leaf spring portion 54 is configured to be able to directly contact the front surface of the back outer shell E when at least the back inner shell F moves rearward, that is, toward the back deflection allowable space I side under the load of the seated person. ing. The leaf spring portion 54 projects rearward from the back inner shell main body 53.

When the back inner shell main body 53 is not receiving the load of the occupant, the leaf spring portion 54 does not necessarily have to be in contact with the back outer shell E, and may be separated from each other. Even when the load of the seated person is not received, the leaf spring portion 54 may be set so as to be in contact with the back outer shell E. The leaf spring portion 54 may not be integral with the back inner shell main body 53 but may be configured by attaching a separate member. The leaf spring portion 54 is integrally formed at a substantially central portion of the back inner shell main body 53 in the vertical and horizontal directions. It is provided in. A plurality of leaf spring portions 54 are provided so as to project rearward from the back inner shell main body 53. Specifically, two leaf spring portions 54 are provided at a substantially central portion of the back inner shell F and are separated from each other left and right.

  The leaf spring portion 54 is inclined with respect to the back inner shell main body 53 and extends rearward, and a contact that is provided at the tip of the tilt spring portion 54a and that can contact the front surface of the back outer shell E. And a portion 54b. The contact portion 54b is formed so as to be substantially parallel to the contact portion of the back outer shell E so that the back surface thereof can come into contact with the front surface of the back outer shell E at the first stage.

  The leaf spring portion 54 is provided so as not to interfere with the back inner shell main body 53. More specifically, even when the back inner shell F moves to the back deflection allowable space I side under the load of the occupant and the leaf spring portion 54 is deformed in a direction approaching the back inner shell main body 53. The leaf spring portion 54 is configured not to contact the back inner shell main body 53.

  That is, in the back inner shell main body 53, when the leaf spring portion 54 is elastically deformed and the leaf spring portion 54 moves relative to the back inner shell main body 53, a notch space 53i where the leaf spring portion 54 can be located is formed. It has a formed notch 53h. The leaf spring 54, which can be located in the notch space 53i, has its base end connected to the edge of the notch 53h.

  In other words, even when the back inner shell main body 53 moves to the back deflection allowable space I side under the load of the seated person, the leaf spring portion 54 does not interfere with the back inner shell main body 53. . Therefore, the occupant can push the back inner shell body 53 backward until the back inner shell body 53 and the leaf spring portion 54 have a relative positional relationship such that they are substantially flush. In other words, the back inner shell F of the chair in this embodiment has a configuration in which the back inner shell main body 53 can move rearward without being blocked by the leaf spring portion 54, so that the back deflection allowable space I is effectively used without waste. It can be used for

[Lumbar supporter 55]
The lumber supporter 55 has a substantially plate shape. The lumbar supporter 55 is pushed out from the rear by a pushing member G supported by the back outer shell E and slidable in the left-right direction, so that substantially the whole, that is, the directly pushed-out portion and its surrounding portion move in the front-rear direction. It is configured to be able to.

  The lumbar supporter 55 is disposed in an opening 53 a formed in the back inner shell main body 53 at a position that does not interfere with the back inner shell main body 53. The lumber supporter 55 is connected to the back inner shell main body 53 via a belt-shaped connecting member 56. In other words, the lumbar supporter 55 and the back inner shell main body 53 are separated at portions other than the connecting member 56. The lumbar supporter 55 and the leaf spring 54 are also separated.

<Extruded member G>
The left and right pushing members G are directly operated independently of the left and right by being gripped by the user. The left and right pushing members G have grip portions that can be gripped by the user, and can be slid in the left-right direction with respect to the back outer shell E under the direct operation force of the user. The left and right pushing members G can exert a lumbar support function of pressing a plate-shaped lumbar supporter 55 provided on a part of the back inner shell F from behind and pressing a waist portion of a seated person. . In other words, a lumbar support device capable of pressing and supporting the waist portion of the occupant is constituted mainly by the left and right pushing members 55 provided on the back outer shell E and the lumbar supporters 55 provided on the back inner shell F. . If the degree of operation of the left and right pushing members G is made different, the lumbar supporter 55 can be tilted.

<Covering material H>
The upholstery material H can cover the front surface and the peripheral edge of the back inner shell F. As shown in FIG. 14, the upholstery material H has a cushion material 57b made of a foam material, a nonwoven fabric, or the like, and has an upholstery 57a provided on the outer surface thereof. Note that the upholstery material H only needs to be mainly composed of the upholstery 57a, and may not be provided with a cushion material. The upholstery H covers a portion of the back inner shell F that is not hidden by the back outer shell E.

  The upholstery H includes an upholstery main body 57 having an upholstery 57a disposed on the outer surface side, a reinforcing member 58 (upper) serving as a reinforcing member attached to an edge of the upholstery main body 57, and left and right (side) ) A reinforcing member 59 is provided. In this embodiment, the left and right (side) reinforcing members 59 arranged in pairs on the left and right are formed in a belt shape extending in the up-down direction.

[Covering material body 57]
The upholstery main body 57 has a cushion material 57b made of a foam material disposed on the front side of the back inner shell F and an upholstery 57a stretched over the outer surface. The upholstery main body 57 has a form capable of covering the entire front surface, the peripheral portion, and the rear surfaces of the upper and lower portions of the back inner shell F. The upholstery 57a is a sheet having a certain elasticity, and is made of a cloth material, a synthetic resin sheet material, or the like.

[Upper (upper) reinforcing member 58]
The upper reinforcing member 58 is a band-shaped member made of synthetic resin and extending in the left-right direction. The upper reinforcing member 58 is sewn to the edge of the upholstery body 57 located on the back side of the back inner shell F. At the lower end of the upper reinforcing member 58, a plurality of hooks 58a are provided at intervals in the left-right direction. These hook portions 58a can be engaged with hook holes 53d provided in the back inner shell F.

[Left and right (side) reinforcing members 59]
The left and right reinforcing members 59 are made of synthetic resin in the shape of a strip extending continuously in the vertical direction. The left and right reinforcing members 59 are sewn to left and right side edges of the upholstery main body 57 located on the back side of the back inner shell F. In other words, the left and right reinforcing members 59 are attached to the left and right opening edges of the upholstery body 57 via the sewn portions ny.

  The left and right reinforcing members 59 can be positioned with respect to the back inner shell F. That is, the outer edges 59a of the left and right reinforcing members 59 are engaged with or contact with the positioning protrusions 53b protruding from the back inner shell F, so that the left and right reinforcing members 59 are positioned with respect to the back inner shell F. ing.

  The left and right reinforcing members 59 are covered with the upholstery main body 57 in a rear view. That is, the upholstery H covers the backing side of the left and right reinforcing members 59 with the upholstery main body 57.

  The procedure of providing the upholstery material H on the back inner shell F is performed, for example, as follows.

  The upper and lower portions of the bag-like upholstery H are mounted near the upper edge and the lower edge of the back inner shell F. Then, the hook portion 58a of the upper reinforcing member 58 sewn on the upper part of the upholstery member body 57 is engaged with the hook hole 53d provided in the back inner shell F.

  Next, the outer edges 59a of the left and right reinforcing members 59 are brought into contact with the positioning projections 53b provided on the left and right sides of the back inner shell main body 53 on the back side. While maintaining the state, that is, the state in which the outer edges 59a of the left and right reinforcing members 59 abut on the positioning protrusions 53b, the left and right reinforcing members 59 are changed in posture and the vertical position as necessary while the upholstery material body 57 is extended. Finally, the front surfaces of the left and right reinforcing members 59 (surfaces facing the back inner shell F side) can be brought into contact with the back surface of the back inner shell main body 53. In this state, the left and right reinforcing members 59 are attached to the back inner shell main body 53 by staples st, which are fasteners.

  The staple st is made of metal and is attached using an attachment such as a tucker. The staple st penetrates the upholstery main body 57 and the left and right reinforcing members 59 in this order, and can fix the upholstery main body 57 and the left and right reinforcing members 59 to the back side of the back inner shell F.

  The back inner shell F is supported by a back outer shell E disposed on the back side thereof. In other words, the staples st exposed to the outside are covered and concealed by the back outer shell E by tacking the side edges of the upholstery H on which the left and right reinforcing members 59 are disposed to the back side of the back inner shell F. Will be.

  As shown in FIGS. 15 and 16, the chair shown in the present embodiment is one of a plurality of types of back inner shells F arbitrarily selected with respect to a common, that is, a single type of back outer shell E. The back inner shell F can be selected and supported. In other words, the chair has one type of back inner shell arbitrarily selected from a plurality of types, that is, low back type (LB) and high back type (HB) back inner shells F with respect to the common back outer shell E. It is made based on a system that can selectively support the shell F.

  That is, the chair attaches one back inner shell F selected from a plurality of types of back inner shells F having different height dimensions to the engaging claw 52 and the fitting concave portion 51b, which are attachment portions of the common back outer shell E. And a backrest 5 configured to obtain the backrest. In this embodiment, a plurality of types of back inner shells F are composed of a low back type (LB) back inner shell F shown in FIGS. 15A and 15C and FIGS. It is a back inner shell F of the high back type (HB) shown in FIG. 16B and FIG.

  Each of the plurality of types of back inner shells F, that is, each of the low back type (LB) back inner shell F and the high back type (HB) back inner shell F is thinner than the back outer shell E. The degree of elastic deformation when receiving a load of a seated person is set higher than that of the back outer shell E.

  Each of the plurality of types of back inner shells F has a protruding portion 53j protruding above the upper end edge of the back outer shell main body 51 in the back outer shell E in rear view. The protruding portion 53j of the back inner shell F is covered with the upholstery H.

  The chair according to the present embodiment has an additional inner portion having a portion extending above the back inner shell F only when a specific back inner shell F is attached to the back outer shell E among the plurality of back inner shells F. It is set so that the headrest 8 as a shell member can be attached.

  The chair is set such that the headrest 8 as an additional inner shell can be attached to the backrest 5 only when a specific back inner shell F among a plurality of back inner shells F is attached to the back outer shell E. . Specifically, as shown in FIGS. 15C and 16C, the back inner shell F of a short height type (hereinafter, referred to as a “low back type (LB)”) is replaced with a back outer shell. When supported by E, the headrest 8 can be attached to the front side of the back inner shell F of the low-back type (LB). The upper part of the low back type (LB) back inner shell F is configured not to interfere with the headrest 8.

  The mounting member Q of the headrest 8 can be located in front of a low back type (LB) back inner shell F. The headrest main body P of the headrest 8 is configured to be able to be located above the upper end edge of the low back type (LB) back inner shell F. The front and rear surfaces of the headrest main body P and the front side of the mounting member Q are covered with the upholstery H that covers the back inner shell F.

<< armrest 6 >>
The armrest 6 includes an elbow support J supported by the seat 3 constituting the chair main body, an elbow pad 64 movably provided with respect to the elbow post J, and the elbow support 64 being moved to the most advanced position (z) and the last position. And an elbow rest guide mechanism L that slides on a predetermined trajectory between the position (k).

  The armrest 6 holds an armrest main body K including an armrest 64 on an elbow support J attached to the seat 3 so as to be able to change the vertical position.

<Elbow support J>
The elbow support J is formed in a substantially L shape in a front view. The elbow support J has a mounting portion 61 attached to a lower surface of the seat outer shell A at a lower portion, and a tubular portion 62 at an upper portion capable of holding the armrest body K so as to be able to move up and down. Inside the tubular portion 62 of the elbow support J, a lifting / lowering position changing mechanism (not shown) that can change the lifting / lowering position of the armrest main body K by operating a lifting / lowering operation button 63b arranged on the armrest support portion 63 is provided. I have.

<Armrest body K>
The armrest body K includes an armrest support portion 63 having a columnar portion (not shown) held by the cylindrical portion 62, and an armrest 64 supported on the armrest support portion 63. The elbow rest 64 is configured to be slidable with respect to the elbow rest support 63 by the elbow rest guide mechanism L. That is, between the elbow rest support 63 and the elbow rest 64, the elbow rest guide mechanism L for sliding the elbow rest 64 on a predetermined track between the most advanced position (z) and the most retreated position (k). Is provided.

[Elbow support 63]
The elbow support portion 63 includes a vertically extending columnar portion disposed on the cylindrical portion 62 of the elbow support J, and a support base 63a disposed on the columnar portion. The support base 63a is set to have a larger dimension in the front-rear direction than the columnar portion. The support base 63a is configured to support the elbow pad 64 from below so as to be slidable.

  The support base 63a is provided on the upper surface side with a first guide slit 63c that can guide the elbow pad 64 to a predetermined track. The first guide slit 63c is provided at a front portion of the support base 63a. The first guide slit 63c has a shape that is curved so as to project inward in the plan view, that is, toward the middle part in the left-right direction of the chair body. The front end of the first guide slit 63c is set to be located inside the rear end of the first guide slit 63c. The first guide slit 63c is engaged with a movable guide shaft 64e protruding from the elbow pad 64.

  The support base 63a is provided with a fixed guide shaft 63d protruding upward on the rear side of the first guide slit 63c. The fixed guide shaft 63d cannot move back and forth with respect to the elbow support J. The fixed guide shaft 63d is attached to the rear end of the support base 63a. The fixed guide shaft 63d is located outside the front end of the first guide slit 63c and inside the rear end of the first guide slit 63c in plan view. Note that a roller 63e is rotatably mounted on the fixed guide shaft 63d. The roller 63e is engaged with the surrounding wall 64f surrounding the peripheral portion of the second guide slit 64d provided on the elbow support base 64c, and the fixed guide shaft 63d can smoothly move relative to the inside of the second guide slit 64d. It has become.

[Elbow pad 64]
The elbow pad 64 can slide on the elbow pad support 63 along a predetermined trajectory. The elbow pad 64 adopts a forward posture (ms) in the front-rear direction at the most advanced position (z) and the most retreated position (k). The armrest 6 is set such that the armrest 64 at the most retreated position (k) in plan view is located farther from the center in the left-right direction of the chair body than the armrest 64 at the most advanced position (z). As shown in FIG. 40, the virtual center line cs of the elbow pad 64 at the rearmost position (k) is located outside the virtual center line cs of the elbow pad 64 at the most advanced position (z). .

  The elbow pad 64 includes an elbow pad cushion 64a disposed at an upper part, a cushion receiver 64b attached below the elbow pad cushion 64a, and an elbow pad base 64c disposed under the cushion receiver 64b.

  The elbow rest base 64c has a second guide slit 64d formed in a rear portion thereof, which penetrates vertically. The second guide slit 64d is provided in the rear half of the elbow pad base 64c. The second guide slit 64d has a shape that is curved so as to project inward in the plan view, that is, toward the middle portion of the chair body in the left-right direction. The front end of the second guide slit 64d is set to be located inside the rear end of the second guide slit 64d. The second guide slit 64d is adapted to engage with a fixed guide shaft 63d protruding from the support base 63a of the elbow rest support 63.

  The elbow rest base 64c is provided with a movable guide shaft 64e protruding downward to the front side of the second guide slit 64d. The movable guide shaft 64e can move back and forth integrally with the elbow rest base 64c. The movable guide shaft 64e is attached to a nut 64g fixed to the elbow pad base 64c. The movable guide shaft 64e is provided at the center in the left-right direction in plan view. More specifically, the movable guide shaft 64e is located outside the front end of the second guide slit 64d and inside the rear end of the second guide slit 64d in plan view. .

<Elbow rest guide mechanism L>
The armrest guide mechanism L guides the armrest 64 so as to advance and retreat through an intermediate position (c) between the most advanced position (z) and the most retreated position (k).

  In this embodiment, as shown in FIG. 41, the position of the front end is located at the innermost position and the position of the rear end is located at the outermost position at the intermediate position (c) due to the action of the armrest guide mechanism L, as shown in FIG. It adopts a positioned inward posture (us).

  The elbow rest guide mechanism L includes a first guide slit 63c and a fixed guide shaft 63d provided on a support base 63a of the elbow rest support 63, and a second guide slit provided on an elbow rest base 64c of the elbow rest 64. 64d and a movable guide shaft 64e.

  The operation of the armrest 64 by the armrest guide mechanism L will be described in detail below.

  That is, the armrest 64 can slide in the front-rear direction with respect to the armrest support 63. The elbow pad 64 extends from a most advanced position (z) in a forward position (ms) substantially parallel to the center line in the left-right direction of the chair body to a most retracted position (k) in a similar forward position (ms). It can move back and forth in a certain orbit.

  In this embodiment, the first guide slit 63c, which is a fixed slit provided in the armrest support portion 63, cooperates with a movable guide shaft 64e provided in the armrest 64, and the movable guide shaft 64e provided in the armrest 64 By the cooperation of the second guide slit 64d serving as the slit and the fixed guide shaft 63d provided in the elbow rest support 63, the elbow rest 64, which has been operated by the user, is moved to the most advanced position (z) and the last position. It can slide between the retreat position (k).

  More specifically, the slide trajectory at the front end of the elbow pad 64 is set in a mountain shape convex inward as shown by the bold line shown in FIG. The slide trajectory at the rear end portion is set in a mountain shape that protrudes outward, as indicated by the bold line displayed in FIG. According to the slide trajectory set by the elbow rest guide mechanism L, the elbow rest 64 performs a forward and backward movement and a rotation operation (a swing operation). As a result, when the elbow pad 64 is located at the intermediate position (c), the front end is located closest to the center in the left-right direction of the chair body.

  The elbow pad 64 takes the same posture at the most advanced position (z) and the most retreated position (k), that is, a forward posture (ms) facing the front-rear direction. The armrest 6 is set such that the armrest 64 at the most retreated position (k) in plan view is located farther from the center in the left-right direction of the chair body than the armrest 64 at the most advanced position (z). That is, the first guide slit 63c formed in the support base 63a of the elbow support portion 63 and the second guide slit 64d formed in the elbow support base 64c of the elbow support 64 project inward. It has a shape that draws a curve so as to make it, and the front end is set closer to the center in the left-right direction of the chair body than the back end, so the position of the armrest 64 in the left-right direction with respect to the armrest support 63 is Is different between the case where it is at the most advanced position (z) and the case where it is at the last retreat position (k).

  The position of the armrest 64 at the rearmost position (k) is set to be located outside the position of the armrest 64 at the most advanced position (z). For this reason, when the chair adopts the backward tilting posture, by positioning the elbow pad 64 at the retreat position (k), the user can use the elbow pad 64 to relax the smartphone or tablet terminal or the like. It can be browsed.

  On the other hand, the position of the elbow pad 64 at the most advanced position (z) is set to be located inside the position of the elbow pad 64 at the most retreated position (k). That is, in the normal working posture, the elbow pad 64 at the most advanced position (z) is not excessively separated outward. For this reason, the elbow pad 64 at the most advanced position (z) is relatively close to the user, and can be located in a suitable place that is easy for the user to use, such as a keyboard operation or a writing operation.

  Note that the elbow rest guide mechanism L in this embodiment is configured such that the first guide slit 63c is disposed on the side of the elbow rest support 63, so that the second guide slit, which is a single slit, is disposed on the side of the elbow rest base 64c. A configuration in which only 64d is provided is realized, and the rigidity of the elbow support base 64c is easily increased.

  That is, in the related art, a plurality of slits are arranged in a member corresponding to the elbow support base 64c in the present embodiment, and a plurality of fixing members are provided in the member corresponding to the support base 63a in the present embodiment so as to correspond to the plurality of slits. A guide shaft was provided. However, in the conventional device, since a plurality of slits are formed in a member corresponding to the elbow rest base 64c, the degree of freedom in designing to maintain the strength (particularly in a portion located between the plurality of slits) is low. Had become something. In the chair according to the present embodiment, the elbow rest base 64c has a configuration in which only the second guide slit 64d, which is one guide slit, is sufficient, so that the conventional inconvenience can be suitably solved. ing.

<< hanger 7 >>
The hanger 7 is configured to be attached using a through hole 51a provided in a back outer shell E which is a back plate. The hanger 7 includes a hanger main body M as an optional main body and a hanger mounting member N as an optional mounting member for mounting the hanger main body M to the back outer shell E.

<Hanger body M>
The hanger body M is provided with a clothing support portion 71 extending in the left-right direction capable of suspending and supporting the clothing, and a base 72 having a U-shape in rear view and having an upper end integrally connected to the clothing support portion 71. ing.

[Clothing support part 71]
The clothing support portion 71 has a form extending in the left-right direction that can mainly support the clothing. The clothing support 71 has a shape that is gently curved so as to project upward.

[Base 72]
The base 72 includes a vertically extending portion 72a that extends in the vertical direction and is arranged in pairs on the left and right, and a connecting portion 72f that connects the lower ends of the left and right vertically extending portions 72a.

  The vertically extending portion 72a has a held portion 72b held by the hanger mounting member N. An engagement groove 72c used to hold the hanger body M at the upper position and the lower position is provided on the inner surface side of the held portion 72b. A protruding portion 72d that protrudes inward is formed near the upper end and the lower end of the engagement groove 72c. Then, the tips of the pair of left and right pressers 75c provided on the hanger mounting member N and elastically urged outwardly move relative to each other in the engagement groove 72c and get over the raised portion 72d, thereby moving the hanger main body M. The hanger mounting member N can be held at an upper position or a lower position. The pair of left and right pressing elements 75c is disposed inside the held portion 72 of the hanger body M forming a pair on the left and right. Positioning grooves 72e for positioning with respect to the hanger mounting member N are provided on the front end side and the rear end side of the held portion 72b.

  The connecting portion 72f has a curved shape so as to protrude rearward so as to avoid interference with the back support 4 having a columnar shape. A gap sk into which a user's finger can be inserted is formed between the connecting portion 72f and the back support 4. The connecting portion 72f of the hanger body M can function as an operation handle that can be gripped by a user and move the entire chair with respect to the floor.

<Hanger mounting member N>
The hanger mounting member N includes a member main body 73 disposed on the back side of the back outer shell E, an engaging member 74 supported to be relatively movable in the left-right direction with respect to the member main body 73, and a hanger main body M in the upper position. Alternatively, a holding member 75 that can be held at the lower position is provided. Further, the hanger mounting member N has a detent mechanism 76 for restricting the engagement member 74 at the engagement position (g) from returning to the insertable position (a), and the engagement at the engagement position (g). A screwing mechanism 77 for firmly attaching the member 74 to the back outer shell E is provided.

[Member body 73]
The member main body 73 has a substantially U-shaped outer shape in a front view. The member body 73 is formed symmetrically. The front end portion of the member main body 73 is set so as to be in contact with the back surface of the back outer shell E when attached to the back outer shell E. On both left and right sides on the front side of the member main body 73, housing portions 73a capable of housing the base 74a of the engaging member 74 slidably in the left and right direction are provided. The member main body 73 has a screw insertion hole 73b penetrating in the front-rear direction. The screw insertion holes 73b are provided in the left and right storage portions 73a, respectively. By screwing a screw v1 inserted through the screw insertion hole 73b to a nut 74g provided on the engagement member 74, each engagement member 74 is configured to be drawn toward the member main body 73 side. An engagement protrusion 73c that is elastically deformable in the up-down direction and protrudes upward is provided at a lower end portion of the housing portion 73a. A plurality of positioning projections 73d projecting forward are provided at the upper end of the member body 73. The positioning projection 73d is located in the through hole 51a of the back outer shell E.

[Engaging member 74]
The engaging member 74 is movably housed in the housing 73 a of the member main body 73. That is, the engaging member 74 is configured such that the back plate engaging portion 74f can be inserted from the back side into the through hole 51a through an insertable position (a) and the back plate engaging portion 74f is positioned at the edge of the through hole 51a in the back outer shell E. Is configured to be movable in the left-right direction with respect to the member main body 73 between an engagement position (g) that can be engaged with the member body 73.

  The engagement members 74 are provided in pairs. That is, the engagement members 74 are provided in pairs on the right and left sides of the member body 73. The pair of engaging members 74 can move in opposite directions. In this embodiment, in the front view, on the left side of the engaging member 74, the inside right position is the insertable position (a), and the outside left position is the engaging position (g). On the other hand, in the front view, the right engaging member 74 has an inner left position that is the insertion position (a) and an outer right position that is the engaging position (g).

  The engaging member 74 includes a base 74a held in the member main body 73, that is, a housing 73a of the member main body 73, a plurality of front extensions 74e protruding forward from the base 74a, and a plurality of front extensions 74e. There are a plurality of back plate engaging portions 74f extending from the front end in a direction substantially orthogonal to the front extending portion 74e. The front extension 74e and the back plate engaging portion 74f form an L-shaped hook. In other words, the front extension 74e and the back plate engaging portion 74f form an engaging hook that engages the back outer shell E.

  The base 74a has a plate shape. On the inner surface at the lower part of the base 74a, there is provided a pressed operated portion 74b which is pressed when the user performs the mounting operation. When the engaging member 74 is at the insertable position (a), the pressed operated portion 74b is in a state of protruding inward from the housing portion 73a of the member main body 73 in rear view. The user can press the pressed operated portion 74b outward with a finger or the like, that is, in the direction in which the engaging member 74 moves outward, and move the engaging member 74 to the engaging position (g). When the engagement member 74 is located at the engagement position (g) by the user's operation, the inner surface of the pressed operated portion 74b, that is, the surface with which the user's finger abuts, smoothly continues to the edge of the member body 73. It has become.

  The base 74a has a nut holding hole 74c with a concave front surface. A nut 74g is held in the nut holding hole 74c. A concave portion 74d is provided at the lower end of the base portion 74a so as to be able to engage with an engaging projection 73c provided on the member main body 73 so as to be left and right apart. When the engaging member 74 is at the engaging position (g) or the insertable position (a), the concave portions 74d can engage with the engaging protrusions 73c provided on the member main body 73.

  The front extension part 74e is a horizontally long columnar member that stands upright from the front surface of the outer part of the base part 74a. The front extending portions 74e are erected at a plurality of positions, that is, at three positions at predetermined intervals in the vertical direction. The standing portion of the front extension portion 74e in the base portion 74a corresponds to the through hole 51a at a predetermined position provided in the back outer shell E. In this embodiment, the front extension portions 74e erected vertically in the base portion 74a are different in size from each other, and the distance between adjacent front extension portions 74e is also different. For this reason, the hanger 7 can be attached only to a specific position of the back outer shell E. That is, the plurality of through-holes 51a provided in the back outer shell E are not set to have the same size or the same separation distance from other adjacent through-holes 51a. Therefore, the user can mount the hanger 7 only at an appropriate position on the back outer shell E where the hanger 7 should be mounted. That is, the hanger 7 can be attached to the back outer shell E only at a position where the arrangement of the plurality of back plate engaging portions 74f and the arrangement of the plurality of through holes 51a match.

  The back plate engaging portion 74f extends outward from a front end portion of the front extension portion 74e substantially orthogonal to the front extension portion 74e. The back plate engaging portion 74f is set to be smaller than the through hole 51a of the back outer shell E into which the back plate engaging portion 74f is inserted. The back plate engaging portion 74f has a horizontally long cylindrical shape. The back plate engaging portion 74f is inserted into the through hole 51a of the back outer shell E from the back side. After the back plate engaging portion 74f is inserted into the back outer shell E from the back side, it can be located on the front side of the back outer shell E. The back plate engaging portion 74f can be moved to an engaging position (g) where it can be engaged with the back outer shell E by operating the engaging member 74 from the back side.

  Since the back plate engaging portions 74f are provided integrally with the front extending portions 74e, they are arranged at a plurality of positions, that is, at three positions at predetermined intervals in the vertical direction. The location of the back plate engaging portion 74f corresponds to the through hole 51a at a predetermined position provided in the back outer shell E. In this embodiment, the sizes of the back plate engaging portions 74f arranged side by side in the vertical direction are different, and the distance between adjacent back plate engaging portions 74f is also different. For this reason, the hanger 7 can be attached only to a specific position of the back outer shell E.

[Holding member 75]
The holding member 75 has a holding concave portion 75a that can hold the hanger body M, and is attached to the back side of the member body 73 by an attachment screw 75b. The holding member 75 has the same width as the width of the member body 73. The holding member 75 is provided with a pair of right and left pressing elements 75c which are urged outward by a spring (not shown) and whose front ends press the engaging grooves 72c of the hanger body M.

[Detent mechanism 76]
The detent mechanism 76 can restrict the engagement member 74 at the engagement position (g) from returning to the insertable position (a).

  In this embodiment, the detent mechanism 76 includes an engagement protrusion 73c provided on the member body 73 and an engagement protrusion provided on the engagement member 74 when the engagement member 74 is at the engagement position (g). 73c and a recess 74d (an inner recess 74d) that can be engaged.

[Screw fastening mechanism 77]
The screwing mechanism 77 is for attaching the back outer shell E and the hanger 7 more firmly. The screwing mechanism 77 includes a screw v1, a screw insertion hole 73b provided in the member main body 73, and a nut 74g provided on an engagement member 74 into which the screw v1 having the screw insertion hole 73b inserted is screwed. Things. The screw v1 is inserted into the screw insertion hole 73b and screwed to the nut 74g, so that the engagement member 74 is tightly attached to the back outer shell E and firmly fixed to the engagement position (g). Return to the insertable position (a) is restricted.

  Only when the engagement member 74 is located at the engagement position (g), the screwing mechanism 77 allows the screw v1 to be inserted into the screw insertion hole 73b and screwed to the nut 74g. That is, only when the engagement member 74 is located at the engagement position (g), the position of the screw insertion hole 73b and the position of the nut 74g can match. In other words, the screw v1 cannot be inserted into the screw insertion hole 73b unless the engagement member 74 is properly moved from the insertion position (a) to the engagement position (g). . Therefore, the engaging member 74 that can move relatively to the member body 73 can be moved to an appropriate position where the hanger 7 can be securely attached to the backrest 5.

<< Headrest 8 >>
The headrest 8 is attached to the backrest 5 and can support the head of the occupant from the rear side. The headrest 8 is configured such that it can be mounted on the front side of the back inner shell F only when a type having a short vertical dimension (low back type (LB)) is selected as the back inner shell F. The headrest 8 is covered with the upholstery H that covers the back inner shell F.

  The headrest 8 includes a headrest body to which the head of the occupant can abut, and an attachment member Q provided continuously below the headrest body. The attachment member Q is attached to the back inner shell F using screws inserted at appropriate positions.

<Headrest body P>
The headrest body P can support the head of the seated person from the rear side. The headrest body P has a plurality of slits extending in the left-right direction. The headrest main body P has a rectangular shape set to have substantially the same width as the left-right width at the upper part of the back inner shell F when viewed from the front. The headrest main body P has a shape that is curved such that an intermediate portion in the vertical direction is convex forward when viewed from the side. In other words, the headrest main body P has a shape protruding forward from the front surface of the back inner shell F.

<Mounting member Q>
The attachment member Q is a plate-shaped member provided to extend downward from the lower end of the headrest body P. The attachment member Q comes into contact with the front surface of the back inner shell F, and is fixed to the back inner shell F by a screw as a fastener. The lower central portion of the mounting member Q is cut out so as to avoid the leaf spring portion 54. Positioning projections 81 projecting rearward are formed on the left and right of the lower end of the mounting member Q. These positioning projections 81 are fitted into positioning holes 53f (with the blocking plate 53g removed) provided in the back inner shell F, and as a result, the mounting member Q is positioned on the back inner shell F. Will be.

  Thus, the chair shown in the present embodiment has the upholstery H including the upholstery main body 57 and the left and right reinforcing members 59. Then, the left and right reinforcing members 59 attached to the left and right side ends of the upholstery material body 57 are in contact with the positioning projections 53b provided on the back inner shell F, and are attached to the back inner shell by a fastening tool such as a staple st. It is attached to F. For this reason, wrinkles (wrinkles) of the upholstery main body 57 are less likely to be locally generated at the side edge portions of the back inner shell F, and the generation of unevenness of the cushion material 57b can be suppressed, which is preferable. The backrest 5 having an appearance can be provided.

  The chair includes a backrest 5 that supports a back inner shell F on the front side of a back outer shell E. Further, a leaf spring portion 54 is protruded from the back inner shell F. For this reason, the back inner shell F has a configuration capable of appropriately repelling the load of the occupant.

  In the chair, a plurality of back inner shells F having different heights can be supported by a common back outer shell E. For this reason, it is possible to provide a chair excellent in the degree of freedom in designing the backrest 5 having various variations. In addition, since the plurality of types of back inner shells F are set to have a higher degree of elastic deformation than the back outer shell E, the back inner shell F can provide a suitable reclining comfort for the occupant and a portion overlapping with the back outer shell E can be provided. In cooperation with the back outer shell E, the backrest 5 can be designed so as to secure necessary rigidity.

  The chair has an operating member C for sliding the seat body B back and forth with respect to the seat outer shell A for receiving the seat. The cap 36 constituting the operation member C is mounted on the engagement member 35 constituting the operation member C so that the seat body B cannot be moved to the mounting position (t). That is, by attaching the cap 36, the seat body B is prevented from coming out of the seat outer shell A. Therefore, a suitable structure for preventing the seat body B from coming out of the seat outer shell A can be adopted.

  The chair is provided with a concave portion 34a which is opened downward in the lower surface side of the seat cushion 34 so as to correspond to the seat center slit 33d. For this reason, the cushioning property of the seat cushion 34 can be made less likely to give a feeling of bottoming and excellent in shrinkage, and can be in a state suitable for a seated person. When the seat cushion 34 is compressed, the air present in the recess 34a of the seat cushion 34 smoothly escapes to the outside through the seat center slit 33d. The cushion 34 can be appropriately contracted.

  The chair is configured such that the hanger 7 can be flexibly attached to the back outer shell E from the back side of the back outer shell E.

  The chair is set such that the elbow pad 64 at the most retreated position (k) in plan view is located farther from the center in the left-right direction of the chair body than the elbow pad 64 at the most advanced position (z). For this reason, the elbow pad 64 at the rearmost position (k) can be suitably used in the rearwardly inclined posture, and the elbow pad 64 takes a preferable posture at the most advanced position (z) and the rearmost position (k). It has become something.

  As described in detail above, the chair according to the present embodiment slides the seat body B between the front position (f) and the rear position (r) in a usable state with the seat body B having a seating surface on the upper surface. The seat 3 includes a seat outer shell A which can be movably supported.

  The seat body B can be mounted on the seat outer shell A only at the mounting position (t) set before the front position (f). The seat 3 includes an operation member C supported by the seat body B and capable of sliding the seat body B in the front-rear direction with respect to the seat outer shell A.

  The operating member C includes a movement restricting portion 36b that engages with the outer seat shell A and restricts the main seat body B from sliding to the mounting position (t). Therefore, it is possible to provide a chair having a suitable structure for preventing the seat body B from falling out of the seat outer shell A.

  In other words, the function of restricting the seat body B from being detached from the seat outer shell A also serves as an operation member C capable of positioning the seat body B with respect to the seat outer shell A and allowing the seat body B to slide. Has taken. For this reason, the chair according to the present embodiment is excellent in the degree of freedom of design that can suppress the number of parts.

  The chair according to the present embodiment has a configuration in which the seat body B can be detached from the seat outer shell A if the operation member C is not assembled. For this reason, the form in which the seat outer shell A and the seat body B are engaged can be set flexibly. For example, the seat outer shell A may have a configuration in which the seat outer shell main body 31 and the retaining projection 32 are integrated, so that the seat outer shell A can be flexibly set.

  The seat body B can be mounted on the seat outer shell A only at the mounting position (t) set before the front position (f). On the other hand, the operation member C includes a movement restricting portion 36b that engages with the outer seat shell A and restricts the main seat body B from sliding to the mounting position (t). Therefore, it is possible to prevent the movement restricting portion 36b of the operation member C from moving the seat body B to the mounting position (t), and as a result, the seat body B is not detached from the seat outer shell A. It can be done.

  In other words, the slidable range is reduced by the operating member C at the stage after the seat body B is attached to the seat outer shell A, at the stage where the seat body B is to be attached to the seat outer shell A. Let me. The seat body B cannot be detached from the seat outer shell A in a slidable range after the seat body B is attached to the seat outer shell A. If the mounting structure of the seat body B to the seat outer shell A is configured based on such a concept, the seat body B is excellent in the degree of freedom of design to prevent the seat body B from being locked against the seat outer shell A. Thus, for example, it can contribute to the reduction of the number of parts.

  When the operating member C is vertically movable between an upper position and a lower position (s) with respect to the seat body B and is in the upper position, the seat body B is slid in the front-rear direction with respect to the seat outer shell A. It can be made movable. That is, the operating member C can be moved up and down so that the user can easily operate it so that the position of the seat body B with respect to the seat outer shell A can be set.

  When the operating member C is at the lower position (s), the engaging member 35 includes an engaging portion 35b that selectively engages with the plurality of engaged portions 31a provided on the seat outer shell A; And a cap 36 serving as an operation end member attached to the lower end of the joining member 35. The cap 36 is provided with a movement restricting portion 36b. Therefore, by attaching the cap 36 to the engagement member 35, the movement restricting portion 36b can be made to appear, so that the seat body B can be smoothly attached to the seat outer shell A, and the seat body B A specific structure that prevents the seat outer shell A from being detached can be easily realized by attaching the cap 36 to the engaging member 35.

  The seat body B includes a seat inner shell 33 made of a synthetic resin, and a seat cushion 34 serving as a cushion material disposed on the seat inner shell 33. The seat inner shell 33 is provided with a guide slit 33a extending in the front-rear direction in which the retaining projection 32 provided on the seat outer shell A can be engaged.

  The guide slit 33a includes a main slit 33b capable of supporting the retaining projection 32 so as to be relatively movable and irremovable, and an insertion / removal hole 33c provided after the main slit 33b and configured to allow the retaining projection 32 to be inserted / removed. I have. When the seat body B is at the mounting position (t), the retaining projection 32 can be positioned in the insertion / removal hole 33c. For this reason, a specific form in which the seat body B can be irremovably supported by the seat outer shell A is realized.

  The retaining projection 32 includes an upright portion 32a that can be positioned in the main slit 33b, and an retaining portion 32b provided at an upper end of the upright portion 33b and formed wider than the main slit 33b. For this reason, the retaining projection 32 has a specific configuration in which the seat main body B can take a position where it can be detached from the seat outer shell A and another position where it cannot be detached by engaging with the guide slit 33a. It has become something.

  The seat body B can be inserted into and removed from the seat outer shell A only at the mounting position (t) set before the front position (f). A part of the operation member C can slide in the front-rear direction in the seat receiving slit 31b provided in the seat outer shell A in conjunction with the seat body B. At the front position (f), the movement restricting portion 36b of the cap 36 can come into contact with the locking portion 31c provided on the seat outer shell A. For this reason, the movement restricting portion 36b of the cap 36 comes into contact with the locking portion 31c of the seat outer shell A, and can suitably inhibit the seat body B from moving to the mounting position (t). .

  The seat body B is provided with a seat inner shell 33 as an inner shell made of synthetic resin, and a seat cushion 34 as a cushion material disposed on the seat inner shell 33. Then, the operation member C is urged downward by the seat cushion 34 and is located at the lower position (s) in the non-operation state. For this reason, the operation member C is excellent in flexibility to be set at a predetermined position.

  The seat outer shell A includes a seat outer shell main body 31 and a plurality of retaining projections C projecting upward from the seat outer shell main body 31. The seat outer shell body 31 and the plurality of retaining projections 32 are integrally formed of synthetic resin. For this reason, the number of parts constituting the seat outer shell A can be greatly reduced, which contributes to the management of the number of parts and the reduction in the number of manufacturing steps.

  Note that the present invention is not limited to the embodiment described in detail above.

  The mounting position of the seat body is not limited to the position set before the front position. For example, the mounting position of the seat body may be set after the rear position. Such a configuration can be realized, for example, by providing a wide portion at the front end of the seat receiving slit and providing a movement restricting portion at the rear end of the operation end member.

  The form of the operation member can adopt various forms, and is not limited to the form shown in the above-described embodiment.

  The operation end member is not limited to a cap-shaped member.

  The operation member is not limited to one that moves up and down, and may be one that can move in the left-right direction.

  The shape of the movement restricting portion can be set to various shapes, and is not limited to the shape shown in the above-described embodiment.

  In addition, the specific configuration of each unit is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

3: Seat 36b: Movement restriction part A: Seat outer shell (seat support)
B: Seat body C: Operating member (t): Mounting position

Claims (9)

A chair comprising: a seat having a seat body having a seating surface on an upper surface, and a seat support capable of supporting the seat body in a usable state so as to be slidable between a front position and a rear position. ,
The seat body can be attached to the seat receiver only at a mounting position set before the front position or after the rear position,
The seat is provided with an operation member capable of positioning the seat body supported by the seat body and slidable in the front-rear direction with respect to the seat receiver,
A chair provided with a movement restricting portion that engages with the seat receiver and regulates the seat main body so as not to slide to the mounting position. The operating member is vertically movably supported between an upper position and a lower position with respect to the seat body, and is slidable in the front-rear direction with respect to the seat receiver when in the upper position. The chair according to claim 1, wherein the chair can be put into a state. An engagement member having an engagement portion that selectively engages with a plurality of engaged portions provided on the seat when the operation member is at the lower position; and a lower end portion of the engagement member. And an operation end member attached to the
The chair according to claim 2, wherein the movement restricting portion is provided on the operation end member. The seat body includes an inner shell made of a synthetic resin, and a cushion material disposed on the inner shell,
The inner shell includes a guide slit extending in the front-rear direction in which a retaining protrusion provided on the seat receiver can be engaged,
The guide slit includes a main slit capable of supporting the retaining projection so as to be relatively movable and irremovable, and an insertion / removal hole provided at a position adjacent to the main slit and configured to allow insertion / removal of the retaining projection. And
The chair according to claim 1, 2 or 3, wherein the retaining projection can be positioned in the insertion / removal hole when the seat body is at the mounting position. The chair according to claim 4, wherein the retaining protrusion includes a rising portion that can be located in the main slit, and a retaining portion provided at an upper end portion of the rising portion and formed wider than the main slit. . The seat body is configured to be able to be inserted into and removed from the seat receiver only at the attachment position set before the front position,
A part of the operation member can slide in the front-rear direction in conjunction with the seat body in a seat slit provided in the seat support,
The chair according to claim 1, wherein the movement restricting portion of the operation end member can abut on a locking portion provided on the seat support at the front position. The seat body is configured to be able to be inserted into and removed from the seat receiver only at the mounting position set after the rear position,
A part of the operation member can slide in the front-rear direction in conjunction with the seat body in a seat slit provided in the seat support,
The chair according to claim 1, wherein the movement restricting portion of the operation end member can abut on a locking portion provided on the seat support at the rear position. The seat body includes an inner shell made of a synthetic resin, and a cushion material disposed on the inner shell,
The chair according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the operation member is biased downward by the cushion material and is located at the lower position in a non-operation state. The seat support includes a seat main body and a plurality of retaining projections projecting upward from the seat main body, and the seat main body and the retaining projection are integrally formed of synthetic resin. The chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8.

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