JP7142528B2 - Chair - Google Patents

Description

The present invention relates to chairs used in offices and the like.

2. Description of the Related Art Conventionally, various chairs suitable for use in offices and the like have been known (see Patent Literature 1, for example).

Some chairs of this type are constructed so that a hanger can be attached to the back plate. The hanger is attached at its proximal end to the backboard by various methods.

When trying to attach a hanger to a back plate, in the conventional hanger, a worker arranges a structure for attachment holding fasteners such as screws and nuts on the front side of the back plate, and then attaches the back plate. In general, the main part of the hanger arranged on the rear side is engaged with the mounting structure arranged on the front side of the back plate so that the back plate is sandwiched from the front and back.

However, such a device poses a problem that the operator must always access the front side of the back plate. For example, the front side of the backboard may not be easily accessible to the operator if the front side of the backboard is provided with a cushion, upholstery, or other backboard element. An operator must temporarily remove the cushion, upholstery, or other backboard element from the backboard in order to attach the hanger to the backboard.

In other words, the conventional chair does not have a structure in which the hanger can be flexibly attached to the backboard only from the back side of the backboard.

The above situation is not limited to the hanger, and the same applies to the case where options other than the hanger are attached to the back plate.

JP-A-08-105415

SUMMARY OF THE INVENTION It is an object of the present invention to provide a chair in which an option can be flexibly attached to the back panel from the back side of the back panel.

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

The invention according to claim 1 is a chair configured so that an option can be attached using a through hole provided in a back plate, wherein the option includes an option main body and the option main body is attached to the back plate. The option mounting member comprises a member main body arranged on the back side of the back plate and an engaging member supported so as to be relatively movable with respect to the member main body. , wherein the engaging member has a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after insertion , and the engaging member a base portion held in the member main body, a front extension portion projecting forward from the base portion, and the spine extending from the front end portion of the front extension portion in a direction substantially orthogonal to the front extension portion. A chair comprising a plate engaging portion .

According to a second aspect of the present invention, there is provided a chair configured so that an option can be attached using a through hole provided in a back plate, wherein the option includes an option main body and the option main body is attached to the back plate. The option mounting member comprises a member main body arranged on the back side of the back plate and an engaging member supported so as to be relatively movable with respect to the member main body. wherein the engaging member is inserted into the through hole from the back side and has a back plate engaging portion that can be positioned on the front side of the back plate after being inserted , and the member main body is The chair has a screw insertion hole, and by screwing a screw inserted through the screw insertion hole into a nut provided on the engagement member, the engagement member can be drawn toward the member main body .

The invention according to claim 3 is a chair configured to be able to attach an option using a through hole provided in a back plate, wherein the option includes an option body, and the option body is attached to the back plate. The option mounting member comprises a member main body arranged on the back side of the back plate and an engaging member supported so as to be relatively movable with respect to the member main body. , wherein the engaging member has a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after insertion , and the engaging member is relatively movable with respect to the member main body between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engagement position at which the back plate engaging portion can be engaged with the back plate. a detent mechanism for restricting the engaging member from returning to the insertable position at the engaging position, the screw insertion hole provided in the member main body; and a nut provided on the engaging member to which the screw inserted through the screw insertion hole is screwed. The chair is configured so that the screw can be inserted into the screw insertion hole and attached to the nut only when the chair is positioned.

The invention according to claim 4 is a chair configured so that an option can be attached using a through hole provided in a back plate, wherein the option includes an option main body and the option main body is attached to the back plate. The option mounting member comprises a member main body arranged on the back side of the back plate and an engaging member supported so as to be relatively movable with respect to the member main body. , wherein the engaging member has a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after insertion , and the engaging member However, between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engaging position at which the back plate engaging portion can engage with the back plate, there is a lateral direction with respect to the member main body. It is a chair that is configured to be movable to

According to a fifth aspect of the present invention, there is provided a chair configured so that an option can be attached using a through hole provided in a back plate, wherein the option includes an option main body and the option main body is attached to the back plate. The option mounting member comprises a member main body arranged on the back side of the back plate and an engaging member supported so as to be relatively movable with respect to the member main body. , wherein the engaging member has a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after insertion , and the engaging member However, between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engaging position at which the back plate engaging portion can engage with the back plate, there is a lateral direction with respect to the member main body. The engaging members are provided in pairs on the member body, and the paired engaging members are movable in opposite directions .

The invention according to claim 6 is the chair according to claim 1 , wherein the front extending portion and the back plate engaging portion form a hook shape.

According to a seventh aspect of the invention, the back plate engaging portion can be moved to an engaging position where it can be engaged with the back plate by operating the engaging member from the rear side . , 4, 5 or 6 .

As described above, according to the present invention, it is possible to provide a chair configured so that an option can be flexibly attached to the back panel from the back side of the back panel.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows 1st embodiment of this invention. The right side view in the same embodiment. The front view in the same embodiment. The rear view in the same embodiment. The top view in the same embodiment. The bottom view (a leg is omitted) in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled right side view in the same embodiment. The longitudinal cross-sectional view in the same embodiment. The disassembled perspective view in the same embodiment. The back view of the back inner shell in the same embodiment. The back view of the upholstery material in the same embodiment. The rear view in the same embodiment. XX line schematic cross-sectional view in FIG. The front view in the same embodiment (upholstery material is omitted). The back view in the same embodiment (upholstery material is omitted). The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view which expanded partially in the same embodiment. FIG. 4 is an exploded perspective view of the operating member in the same embodiment; Fig. 3 is a cross-sectional view of the center of the seat in the left-right direction in the same embodiment (state where the seat main body is at the rear position); FIG. 4 is a lateral center end view of the seat in the same embodiment (state where the seat body is in the front position); FIG. 4 is a vertical cross-sectional view of the central portion in the left-right direction showing the recessed portion of the seat cushion in the same embodiment (state where the seat body is at the rear position). Front-back direction center sectional drawing of the seat in the same embodiment. The bottom view of the seat main body in the same embodiment. The bottom view of the seat cushion in the same embodiment. FIG. 4 is a partially enlarged plan view of the seat outer shell in the same embodiment; FIG. 4 is a partially enlarged plan view of the seat outer shell in a state where the operating member is arranged according to the same embodiment; FIG. 4 is a partially enlarged plan view of the same embodiment (state where the seat body is at the rear position); FIG. 4 is a partially enlarged plan view of the same embodiment (state where the seat body is in the front position); FIG. 3 is a partially enlarged bottom view of the same embodiment (state where the seat body is at the front position); FIG. 4 is a partially enlarged plan view of the same embodiment (state where the seat body is at the mounting position); The perspective view in the same embodiment. The perspective view in the same embodiment. The perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. FIG. 4 is a partially enlarged front view showing a comparison between an insertable position and an engaging position of an engaging member in the same embodiment. The disassembled perspective view in the same embodiment. The top view in the same embodiment. The top view in the same embodiment. The top view in the same embodiment. The top view in the same embodiment.

One embodiment of the present invention is described with reference to FIGS. 1-43.

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

The chair is constructed so that armrests 6 and optional hangers 7 and headrests 8 can be attached to the chair body. The chair body is composed of legs 1 , a support base 2 , a seat 3 , a back support 4 and a backrest 5 .

The chair has a seat 3 and a backrest 5 supported by a support base 2 and a back support 4 so as to be synchronously locked. The chair is configured to be rockable between the standard posture shown in FIG. 2 and a backward tilting posture (not shown) in which the seat 3 and the backrest 5 are tilted backward from the standard posture. A lower front portion of the seat 3 of the chair is rotatably supported by a support base 2 and a lower rear portion of the seat 3 is rotatably supported by a back support 4 .

The chair comprises legs 1, a support base 2 attached to the upper ends of the legs 1 so as to be capable of horizontal rotation, 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. , and a headrest 8 attached to the backrest 5 .

This chair will be described in detail below.

<<Leg 1>>
The leg 1 includes a plurality of leg blades 11 having casters at their lower ends, and a leg strut 12 standing from a portion where the upper ends of the leg blades 11 gather. The leg support 12 is configured to be vertically extendable.

<<Support Base 2>>
The support base 2 can rotatably support the front lower portion of the seat 3 and can rotatably support 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 synthetic resin cover.

<< seat 3 >>
A seat 3 is arranged on the support base 2 . The seat 3 is arranged on a shell-shaped seat outer shell A formed of synthetic resin to receive the seat, and on the seat outer shell A, and is supported so as to be slidable in the front-rear direction with respect to the seat outer shell A. The seat body B is vertically movably supported between an upper position and a lower position with respect to the seat body B, and the seat body B can be positioned at a predetermined position of the seat outer shell A when the seat body B is in the lower position. It is provided with an operation member C that can make the seat body B slidable in the longitudinal direction with respect to the seat outer shell A by releasing the restricted state of movement in the longitudinal direction with the seat outer shell A when it is in the position.

When the seat body B is at the rear position (r), the seat 3 is positioned between the central lower surface of the seat body B, namely the downward surface 33f, and the central upper surface of the seat outer shell A, namely the upward surface 31e. A seat deflection allowance space D is formed as a deflection allowance space for allowing the body B to bend downward.

<Seat outer shell A>
The seat outer shell A has a shell-like shape having a size capable of supporting the seat body B at its upper portion. The seat outer shell A allows the seat body B to slide between a front position (f), which is the foremost position, and a rear position (r), which is the rearmost position, in a usable state, that is, a state in which the seat 3 is completely assembled. It is supportable. The front portion of the seat outer shell A is pivotally attached to the support base portion 2 and the rear portion thereof is pivotally attached to the vicinity of the base end portion of the back support 4 . When the chair is ready for use, the front position (f) of the seat body B is the slidable foremost position, and the rear position (r) of the seat body B is the slidable rearmost position.

The seat outer shell A includes a seat outer shell main body 31 which is a seat support body having a shell-like form capable of supporting the seat main body B at the upper part, and a plurality of, i.e., four, retaining members projecting upward from the seat outer shell main body 31. and a protrusion 32 . The seat outer shell main body 31 and the retaining projection 32 are integrally formed.

[Seat outer shell main body 31]
The seat outer shell main body 31 has a recess on the upper surface side of the right side (the right side when viewed from the front and the left side when viewed from the seated person) that is one side of the front portion, with which the engaging portion 35b of the operation member C at the lower position is selectively engaged. A plurality of shaped engaged portions 31a are arranged side by side in the front-rear direction. The engaged portion 31a has a recessed shape that is recessed downward and opened upward. The operating member C engaged with the engaged portion 31 is pushed 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 using the elastic biasing force of the seat cushion 34 and the weight of the seated person. The seat outer shell main body 31 is provided with seat receiving slits 31b extending in the front-rear direction through the plurality of engaged portions 31a arranged in the front-rear direction and substantially parallel to each other. A part of the operating member C that can move back and forth integrally with the seat body B, that is, the middle portion in the vertical direction can be positioned in the seat receiving slit 31b. A front end portion of the seat receiving slit 31b serves as a locking portion 31c with which a movement restricting portion 36c of a cap 36, which is an operating end member constituting the operating member C, can come into contact. Only when the seat body B supporting the engaging member 35 of the operating member C is attached to the seat outer shell A in the front part of the seat receiving slit 31b, in other words, the seat body B is positioned at the attachment position (t). The wide portion 31d is provided so that the lower portion of the engaging member 35 of the operating member C can be inserted downward only when the operating member C is operated.

The seat outer shell body 31 is provided with an upward facing surface 31e that forms a seat deflection allowance space D for allowing downward deflection of the seat body B in the central portion in the front-rear direction and the left-right direction in plan view. ing.

[Retaining protrusion 32]
The retaining projection 32 is erected on the seat outer shell body 31 and has a substantially T-shaped appearance when viewed from the front. The retaining projection 32 engages with the seat inner shell 33 of the seat body B so as to support the seat body B in a non-separable manner with respect to the seat outer shell A, and also allows the seat body B to slide back and forth with respect to the seat outer shell A. can be positioned at The retaining projections 32 are erected at two left and right positions on the front portion of the seat outer shell main body 31 and two left and right positions on the rear portion of the seat outer shell main body 31 . The retaining projection 32 is formed integrally with the seat outer shell body 31 from a synthetic resin.

The retaining projection 32 has a columnar standing portion 32a that can be positioned in the main slit 33b of the guide slit 33a of the seat inner shell 33 in the usable state, and a columnar standing portion 32a that is provided at the upper end of the standing portion 32a and extends from the standing portion 32a. The retaining portion 32b is formed to be wider than the main slit 33b in the guide slit 33a of the pear seat inner shell 33, which has a large width dimension. The width dimension of the retaining portion 32b is set smaller than the opening width of the insertion/removal hole 33c provided in the seat inner shell 33. As shown in FIG.

<Seat body B>
The seat body B has a seating surface on its upper surface. The seat body B comprises a shell made of synthetic resin, that is, a seat inner shell 33 as an inner shell, a seat cushion 34 as a cushioning material arranged on the seat inner shell 33, an outer surface of the seat cushion 34 and the seat inner shell 33. and a skin material (not shown) that covers the outer edge of the cover from the outside.

[Seat inner shell 33]
The seat inner shell 33 has a substantially rectangular shape in a plan view and serves to evenly support the load of the seated person. The seat inner shell 33 has a guide slit 33a extending in the front-rear direction that can be engaged with the retaining projection 32 provided in the seat outer shell A, and a plurality of recesses 34a in the seat cushion 34 provided in the center in the front-rear direction. It has a seat center slit 33d and an operating member holding hole 33e which can support the operating member C so that it can move up and down but cannot be pulled out downward.

The guide slit 33a includes a main slit 33b that engages with the retaining projection 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, behind the main slit 33b. An insertion/removal hole 33c configured to be insertable/removable is provided.

In the chair of this embodiment, as shown in FIG. 32, the retaining protrusion 32 of the seat outer shell A is positioned in the insertion/removal hole 33c of the seat inner shell 33 only when the seat body B is at the mounting position (t). It is designed to be obtained. In other words, only when the seat main body B is positioned at the mounting position (t) further forward than the front position (f) with respect to the seat outer shell A, the retaining projection 32 is fitted to the insertion/removal hole 33c. is positioned so that the seat body B can be attached to the seat outer shell A and the seat body B can be removed from the seat outer shell A.

When the seat inner shell 33 supports only the engaging member 35 that constitutes the operating member C, the seat body B can move to the mounting position (t). After the cap 36 is attached to the member 35, the movement restricting portion 36c provided on the cap 36 acts to prevent the seat body B from being positioned 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 at regular intervals in the left-right direction. Each seat center slit 33d is parallel to the seat center slit 33d adjacent thereto and has substantially the same length. The lower surface of the seat cushion 34 placed on the seat inner shell 33 is provided with a recess 34a at a position corresponding to the seat center slit 33d.

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

The seat inner shell 33 is provided with a downward surface 33f forming a seat deflection allowance space D for allowing downward deflection of the seat body B in the central portion in the front-rear direction and the left-right direction when viewed from the bottom. there is

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

The seat cushion 34 is provided with a plurality of recesses 34a opened downward corresponding to the seat center slits 33d provided in the seat inner shell 33 on the lower surface side thereof.

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. As shown in FIG. At least a portion of each recess 34 a is set to match with each seat center slit 33 d of the seat inner shell 33 . The positions of the recesses 34a in the left-right direction are formed at positions substantially matching the seat center slits 33d of the seat inner shell 33 when viewed from the bottom. When the occupant sits on the seat 3, the air in each recess 34a is pushed downward by the deformed seat cushion 34, passes through each seat center slit 33d of the seat inner shell 33, and is discharged to the outside. It has become.

An operating member biasing portion is provided on the lower surface of the seat cushion 34 at a position corresponding to the operating member C supported by the seat inner shell 33, and can bias the operating member C downward using the elasticity of the seat cushion 34 itself. 34b are formed. The operating member C is always pressed downward by an elastic biasing force of a seat cushion 34 arranged on the operating member C. As shown in FIG. Since the seat cushion 34 and seat inner shell 33 constituting the seat main body B and the operation member C do not change their relative positions in the front-rear direction, the operation member biasing portion 34b can be set. .

<Operating member C>
The operating member C is capable of positioning the seat body B, which is supported by the seat body B and slidable in the longitudinal direction with respect to the seat outer shell A, at a specific position. The operating member C is supported by the seat body B and configured to be vertically movable between an upper position and a lower position. The operating member C is biased downward by the seat cushion 34 having elasticity, and is positioned 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 an engaging member 35 and a cap 36, which is an operating end member, attached to the lower end of the.

[Engaging member 35]
The engaging member 35 has a plate-like engaging member body 35a that extends in the vertical direction, and a cantilevered end portion of the engaging member 35a that extends from the engaging member body 35a and engages the engaged portion 31a of the seat outer shell A. Engagement portion 35b, retaining head portion 35c wider than engagement member main body 35a at the upper end of engagement member main body 35a, and engagement with the peripheral portion of seat receiving slit 31b of seat outer shell A. A restricting protrusion 35d that defines the upper position of the operating member C, that is, the upper limit position when moving upward, and a cap 36 provided at the lower end of the engaging member main body 35a that engages with the cap 36 and the engaging member 35. It is provided with a cap engaging claw 35e to be connected. A portion of the engaging member 35, that is, a vertically intermediate portion of the engaging member 35 is positioned within the seat receiving slit 31b provided in the seat outer shell A. As shown in FIG. When the seat body B is moved back and forth, the engaging member 35 moved to the upper position by the operation of the user can move back and forth by being guided by the seat receiving slit 31b in conjunction with the sliding movement of the seat body B. It has become.

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

The engaged portion 36b of the cap main body 36a is in the shape of a bridge plate. It can be engaged with the pawl 35e.

The movement restricting portion 36c has a columnar shape protruding forward from the cap main body 36a. The width dimension of the movement restricting portion 36c is set to a width dimension that allows it to be positioned within the seat receiving slit 31b.

When the seat 3 is assembled, the seat body B supporting the engaging 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 moved to the engagement member 35. so that it cannot be attached to the Then, the seat body B (in which the engaging member 35 is supported) attached to the seat outer shell A at the attachment position (t) is slid rearward to reach the front position (f) and the rear position (r). ) so that the cap 36 can be properly attached to the engaging member 35 . After the cap 36 is attached to the engaging 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 in the front position (f). , you can no longer move. That is, the movement restricting portion 36c of the cap 36 acts to restrict 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 be moved 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 that is in contact with the lower surface of the seat cushion 34. - 特許庁The seat body B is supported on the seat outer shell A so as to be slidable in the longitudinal direction. When the seat body B is at a predetermined position, specifically, when the seat body B is at the rear position (r) as shown in FIGS. A seat deflection allowance space D is formed to allow the seat inner shell 33 to deflect downward.

That is, the seat outer shell main body 31 is provided with an upward surface 31e at the central portion in the front-back direction and the left-right direction in plan view. The seat inner shell 33 has a downward surface 33f at the central portion in the front-rear direction and the left-right direction. The upward surface 31e of the seat outer shell main body 31 and the downward surface 33f of the seat inner shell 33 are separated from each other. The seat 3 defines a seat deflection allowance space D as a space between the upward surface 31e and the downward surface 33f. As shown in FIG. 22, when the seat body B is in the front position (f), the lower part of the seat body B is positioned in the seat deflection allowance space D in the unloaded state, so the seat deflection allowance space D is almost the same. will not be formed.

In the chair of this embodiment, the seat body B can be attached to the seat outer shell A only at the attachment position (t) set forward of 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. At the stage of attaching the seat body B to 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 portion 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 projection 32 of the seat outer shell A has passed through the insertion/removal hole 33c of the seat body B, the cap 36 is not attached to the engaging member 35 when the seat body B is in the mounting position (t). It cannot be attached. Therefore, the cap 36 is attached to the engaging 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 engaging member 35 only when the seat body B is positioned between the normal movable position in the usable state, that is, 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 engages with the cap engaging claw 35e of the engaging member 35 through temporary elastic deformation. That is, the seat body B is attached to the seat outer shell A, then the seat body B is retracted to be positioned between the front position (f) and the rear position (r), and the cap 36 is directed toward the engaging member 35. The cap 36 can be attached to the engaging member 35 relatively easily by pressing the cap 36 against the engaging member 35 in a difficult manner.

<<back support 4>>
The back support 4 supports the backrest 5 . The back support 4 has a columnar shape when viewed from the back. The back support 4 is connected to the upper and lower portions of the backrest 5 in the middle in the lateral direction. The portion of the back support 4 located behind the backrest 5 is located in the middle portion of the backrest 5 in the left-right direction when viewed from the back.

The back support 4 includes a lower back frame 41 connected to the support base 2 and an upper back frame 42 rotatably supported with respect to the lower back frame 41 . The lower back frame 41 has its lower end rotatably supported by the support base 2 . The lower back frame 41 supports the rear end of the seat outer shell A in the vicinity of the lower end. The lower back frame 41 supports the upper back frame 42 rotatably in the front-rear direction at its upper end 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 . A hanger 7, which will be described later in detail, is attached to the back outer shell E of the backrest 5. As shown in FIG. The hanger 7 is attached in the vicinity of the portion of the back outer shell E that is connected to the back support 4 . The connection portion 72f of the hanger main body M is curved so as to form a rearward projection so as to form a gap sk between itself and the upper back frame 42. As shown in FIG. The connecting portion 72f of the hanger main body M is arranged behind the back support 4 and spaced apart from the back support 4, so that it is used when the entire chair is moved with respect to the floor surface. It can function as a handle to hold.

<<Backrest 5>>
The backrest 5 comprises a back outer shell E, which is a shell-shaped back plate, made of synthetic resin, and a back plate, ie, a front back plate, which is made of synthetic resin and placed in front of the outer shell E. A barrel back inner shell F and a lumbar supporter 55 which is a part of the back inner shell F attached so as to be slidable in the lateral direction with respect to the back outer shell E can be pushed from behind to exhibit a predetermined lumbar support function. It is provided with left and right extruded members G and upholstery H 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 deflection allowance space I, which is a deflection allowance space that allows the back inner shell F to bend backward. The back outer shell E is set to have a higher rigidity than the back inner shell F. Since the back inner shell F has a thinner plate shape 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.

1 to 5, 10, and 12 to 14, and the upholstery material H is omitted in other drawings for convenience of explanation. There is

<back outer shell E>
The back outer shell E is plate-shaped and supports the back inner shell F and is made of synthetic resin. The back outer shell E is formed in a shape that protrudes forward in a side view, that is, in a doglegged shape. The back outer shell E has a curved shape that protrudes rearward in plan view. The upper and lower portions of the back outer shell E are provided with engaging claws 52 as upper mounting portions for supporting the back inner shell F and fitting recesses 51b as lower mounting portions.

The back outer shell E is engaged 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 behind, and an upper mounting portion projecting from the back outer shell main body 51. A claw 52 is provided.

[back outer shell main body 51]
The back outer shell main body 51 is provided with a plurality of through holes 51a for improving the design, enhancing air permeability, or facilitating elastic deformation. The plurality of through-holes 51a are horizontally elongated holes penetrating in the front-rear direction. A plurality of through holes 51 a are provided in the upper portion of the back outer shell main body 51 . In the back outer shell body 51, the degree of separation in the vertical direction and the horizontal direction between the adjacent through holes 51a in the upper portion is set lower (shorter) than the degree of separation in the vertical direction and the horizontal direction between the adjacent through holes 51a in the lower portion. ing. Therefore, the back outer shell main body 51 has a gradation appearance. In addition, since the back outer shell body 51 is provided with a plurality of through holes 51a around the portion held by the back support 4, excessive deformation of the back outer shell body 51 is suppressed, while changing the appearance and improving ventilation. can be improved.

As will be described later, the chair is designed so that the hanger 7, which is an option, can be attached to the back outer shell E only by the user's attachment operation from the back side using a plurality of through holes 51a provided in the back outer shell E. It is configured. On the front side of the lower portion of the back outer shell main body 51, there is provided a fitting recess 51b as a lower mounting portion into which the fitting projection 53e protruding from the rear surface of the lower portion of the back inner shell F can be fitted. The hanger 7 is attached in the vicinity of the connecting portion with the back support 4 of the back outer shell E having excellent strength.

[Engaging Claw 52]
The engaging claws 52 constituting the upper mounting portion are for engaging with the back inner shell F and supporting the upper portion of the back inner shell F. As shown in FIG. A plurality of engaging claws 52 are provided on the upper portion of the front side of the back outer shell main body 51 . More specifically, the engaging claws 52 are provided at four locations with a gap in the left-right direction. The engaging claw 52 is in the shape of an L-shaped hook that is inserted into an engaging hole 53c provided in the back inner shell F from the rear side and engages therewith. The engaging claw 52 has a base end portion 52a that protrudes forward from the back outer shell main body 51, and an upper extending portion 52b that extends upward from the front end of the base end portion 52a. The upper end of the upper extending portion 52b is located above the upper edge of the back outer shell main body 51 in a rear view.

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

<back inner shell F>
The back inner shell F is made of synthetic resin and has a plate shape. 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 that protrudes forward in a side view, that is, in a doglegged shape. The back inner shell F has a curved shape that protrudes rearward in a plan view.

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

The lumbar supporter 55 is pushed from behind by a push-out member G supported so as to be slidable in the lateral direction with respect to the back outer shell E. As shown in FIG.

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

[Back inner shell main body 53]
The back inner shell main body 53 has an outer edge shape similar to that of the back outer shell E. As shown in FIG. The back inner shell main body 53 has an opening 53a forming a region in which the lumbar supporter 55 is arranged.

Positioning projections 53 b are provided on the back side of the back inner shell main body 53 along the left and right side edges of the back inner shell main body 53 . In other words, the positioning projections 53b are arranged at the left and right side ends of the back inner shell main body. The positioning projections 53b are provided substantially parallel to the left and right side edges of the back inner shell main body 53 and are continuously provided in the vertical direction. The positioning projections 53b are provided on the back side of the back inner shell main body 53 at positions closer to the central portion in the left-right direction than the side edges of the back inner shell F. As shown in FIG. The positioning protrusions 53b may be provided on the side edges of the back inner shell F, or may be provided intermittently instead of continuously in the vertical direction.

In the upper portion of the back inner shell main body 53, a plurality of square engaging holes 53c extending in the vertical direction when viewed from the front are arranged side by side in the horizontal direction. The engaging holes 53c are provided so as to correspond to the engaging claws 52 of the back outer shell E. As shown in FIG. The engaging claws 52 of the back outer shell E are inserted from the rear side into the engaging holes 53c at the time of attachment.

In the upper portion of the back inner shell main body 53, a plurality of hooking holes 53d having a convex shape penetrating in the front-rear direction are provided side by side in the left-right direction. 53 d of hooking holes engage the hook part 58a of the upper reinforcement member 58 provided in the upholstery material H. As shown in FIG.

A fitting projection 53e that fits into the fitting recess 51b provided in the back outer shell E is provided on the rear side of the lower portion of the back inner shell main body 53. As shown in FIG.

The back inner shell main body 53 is provided with positioning holes 53f used when mounting the headrest 8 on the left and right of the vertical intermediate portion. When the chair does not have the headrest 8, that is, when the positioning hole 53f used for supporting the headrest 8 is not used, the positioning hole 53f is closed by the closing plate 53g. 7 to 9 show a state in which the closing plate 53g is displayed for convenience of explanation. In addition, as shown in FIGS. 15 and 16, the chair in this embodiment is designed so that the headrest 8 can be attached only when a low-back type (LB) back inner shell F is adopted. When a high-back type (HB) taller than a low-back type (LB) is adopted as the back inner shell F, the headrest 8 cannot be attached. Therefore, the positioning holes 53f and the closing plate 53g are not provided in FIGS. .

[Leaf spring portion 54]
The plate spring portion 54 is provided integrally with the back inner shell main body 53 which can move backward under the load of the seated person. The plate spring portion 54 is configured so as to directly contact the front surface of the back outer shell E at least when the back inner shell F receives the load of the seated person and moves rearward, that is, toward the back deflection allowance space I side. ing. The plate spring portion 54 protrudes rearward with respect to the back inner shell main body 53 .

When the back inner shell main body 53 does not receive the load of the seated person, the plate spring portion 54 does not necessarily need to be in contact with the back outer shell E, and may be separated from the back outer shell E. Conversely, The plate spring portion 54 may be set so as to abut on the back outer shell E even when the load of the seated person is not received. The plate spring portion 54 may be configured by attaching a separate member instead of being integrated with the back inner shell main body 53. The plate spring portion 54 is integral with the central portion of the back inner shell main body 53 in the vertical and horizontal directions. is provided in A plurality of leaf spring portions 54 are provided so as to protrude rearward from the back inner shell main body 53 . Specifically, two plate spring portions 54 are provided in the substantially central portion of the back inner shell F so as to be separated from each other in the left and right direction.

The plate spring portion 54 includes an inclined spring portion 54a that extends rearward by being inclined with respect to the back inner shell main body 53, and a contact portion that is provided at the tip of the inclined spring portion 54a and can contact the front surface of the back outer shell E. and a portion 54b. The abutting portion 54b is formed substantially parallel to the abutment portion of the back outer shell E so that the abutment portion 54b can come into surface contact with the front surface of the back outer shell E at the initial stage when the abutment portion 54b.

The plate spring portion 54 is provided so as not to interfere with the back inner shell main body 53 . More specifically, even if the back inner shell F receives the load of the occupant and moves toward the back deflection allowance space I, the leaf spring portion 54 deforms toward the back inner shell main body 53. , the plate spring portion 54 is configured so as not to hit the back inner shell main body 53 .

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

In other words, even if the back inner shell main body 53 receives the load of the seated person and moves toward the back deflection allowance space I, the plate spring portion 54 does not interfere with the back inner shell main body 53. . Therefore, the seated person can press the back inner shell main body 53 rearward until the relative positional relationship between the back inner shell main body 53 and the plate spring portion 54 is substantially flush with each other. 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 backward without being blocked by the plate spring portion 54, so that the back bending allowance space I is effectively utilized without waste. It can be used for

[Lumbar supporter 55]
The lumbar supporter 55 has a substantially plate shape. The lumbar supporter 55 is supported by the back outer shell E and pushed out from the rear by the pushing member G that can slide in the left-right direction, so that substantially the entirety of the lumbar supporter 55, that is, the directly pushed-out part and the surrounding parts move in the front-rear direction. It is configured so that it can be

The lumbar supporter 55 is arranged in an opening 53 a formed in the back inner shell body 53 at a position where it does not interfere with the back inner shell body 53 . The lumbar supporter 55 is connected to the back inner shell main body 53 via a strip-shaped connecting member 56 . In other words, the lumbar supporter 55 and the back inner shell main body 53 are separated from each other by the portion other than the connecting member 56 . The lumbar supporter 55 and the plate spring portion 54 are also separated from each other.

<Extrusion member G>
The left and right pushing members G are held by the user and directly operated independently on the left and right. The left and right push-out members G have grips that can be gripped by the user, and can be slid in the left-right direction with respect to the back outer shell E by receiving direct operating force from the user. The left and right push-out members G press a plate-shaped lumbar supporter 55 provided on a part of the back inner shell F from behind to exert a lumbar support function of pressing the waist of the seated person. . In other words, 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 constitute a lumbar support device capable of pressing and supporting the waist of the seated person. . The lumbar supporter 55 can be tilted by varying the degree of operation of the left and right pushing members G. FIG.

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

The upholstery material H consists of an upholstery material body 57 having an upholstery material 57a disposed on the outer surface side, an upper (upper) reinforcing member 58 which is a reinforcing member attached to the edge of the upholstery material body 57, and left and right (side parts). ) and a reinforcing member 59 . In this embodiment, the left and right (lateral) reinforcing members 59 arranged in a pair on the left and right are formed in a strip shape extending in the vertical direction.

[Upholstery main body 57]
The upholstery material main body 57 has a cushioning material 57b made of a foam material arranged on the front side of the back inner shell F and an upholstery material 57a on the outer surface. The upholstery main body 57 has a form capable of covering the entire front surface of the back inner shell F, the peripheral portion, and the upper and lower rear surfaces. The upholstery 57a is in the form of a sheet having a certain stretchability, 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 made of synthetic resin and has a belt-like shape extending in the left-right direction. The upper reinforcing member 58 is sewn to the edge of the upholstery main body 57 located on the back side of the back inner shell F. As shown in FIG. A plurality of hook portions 58a are provided at the lower end portion of the upper reinforcing member 58 at intervals in the left-right direction. These hook portions 58a can be engaged with hooking holes 53d provided in the back inner shell F. As shown in FIG.

[Left and right (side) reinforcing members 59]
The left and right reinforcing members 59 are made of synthetic resin and have a strip shape continuously extending in the vertical direction. The left and right reinforcing members 59 are sewn to the left and right side edges of the upholstery main body 57 located on the back side of the back inner shell F. As shown in FIG. In other words, the left and right reinforcing members 59 are attached to the left and right opening edges of the upholstery material 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. As shown in FIG. That is, the left and right reinforcement members 59 are positioned with respect to the back inner shell F by engaging or contacting the outer edges 59a of the left and right reinforcement members 59 with the positioning projections 53b projecting from 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 material H covers the back side of the left and right reinforcing members 59 with the upholstery material body 57 .

The procedure for applying the upholstery material H to the back inner shell F is performed, for example, as follows.

In the vicinity of the upper edge and the lower edge of the back inner shell F, upper and lower parts of the upholstery material H having a bag shape are attached. Then, the hook portion 58a of the upper reinforcing member 58 sewn to the upper portion of the upholstery material body 57 is engaged with the hooking hole 53d provided in the back inner shell F. As shown in FIG.

Next, the outer edges 59a of the left and right reinforcing members 59 are brought into contact with the left and right positioning projections 53b provided on the back side of the back inner shell main body 53. As shown in FIG. While maintaining this state, that is, the state in which the outer edges 59a of the left and right reinforcing members 59 are in contact with the positioning projections 53b, the upholstery main body 57 is stretched and the left and right reinforcing members 59 are changed in posture and vertical position as necessary. Finally, the front surfaces of the left and right reinforcing members 59 (surfaces facing the back inner shell F side) are 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 attached using an attachment tool such as a tacker. The staple st passes through the upholstery material body 57 and the left and right reinforcing members 59 in this order so that the upholstery material body 57 and the left and right reinforcing members 59 can be fixed to the back side of the back inner shell F.

The back inner shell F is supported by the back outer shell E arranged on the back side thereof. That is, by tuckering the side edges of the upholstery material H on which the left and right reinforcing members 59 are arranged to the back side of the back inner shell F, the staples st exposed to the outside are covered and hidden by the back outer shell E. become a thing.

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

That is, in the chair, one back inner shell F selected from a plurality of types of back inner shells F with different height dimensions is attached to the engaging claws 52 and fitting recesses 51b, which are the attachment portions of the common back outer shell E. It is provided with a backrest 5 configured to obtain. In this embodiment, a plurality of types of back inner shells F are a low-back type (LB) back inner shell F shown in FIGS. 16(b) and 16(c) are high-back type (HB) back inner shells F. FIG.

Any of the plurality of types of back inner shell F, that is, both 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 is set higher than that of the back outer shell E when receiving the load of the seated person.

Each of the plurality of types of back inner shells F has a protruding portion 53j that protrudes upward from the upper edge of the back outer shell main body 51 of the back outer shell E in rear view. A protruding portion 53j of the back inner shell F is covered with an upholstery material H. As shown in FIG.

The chair of this embodiment has an extension inner having a portion that extends above the back inner shell F only when a specific back inner shell F among a plurality of back inner shells F is attached to the back outer shell E. It is set so that a headrest 8, which is a shell member, can be attached.

The chair is set so that the headrest 8, which is 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. 15(c) and 16(c), a back inner shell F of a short height type (hereinafter referred to as “low back type (LB)”) is attached to the back outer shell. A headrest 8 can be attached to the front side of the back inner shell F of the low-back type (LB) when supported by E. The upper portion of the low-back type (LB) back inner shell F is configured so as not to interfere with the headrest 8 .

The mounting member Q of the headrest 8 can be positioned in front of the back inner shell F of the low-back type (LB). The headrest main body P of the headrest 8 is configured to be positioned above the upper edge of the back inner shell F of the low-back type (LB). The front and rear surfaces of the headrest main body P and the front surface of the mounting member Q are covered with a covering material H that covers the back inner shell F. As shown in FIG.

<<Armrest 6>>
The armrest 6 includes an elbow support J supported by the seat 3 that constitutes the chair body, an armrest 64 provided movably with respect to the elbow support J, and the armrest 64 at a most advanced position (z) and a most retracted position. and an elbow rest guide mechanism L that slides on a predetermined track between the position (k).

The armrest 6 has an armrest main body K including an armrest 64 held by an armrest J attached to the seat 3 so as to be vertically changeable.

<Elbow support J>
The elbow support J is formed in a substantially L shape when viewed from the front. The armrest J has an attached portion 61 attached to the lower surface of the seat outer shell A at its lower portion, and has a tubular portion 62 at its upper portion capable of holding the armrest main body K so as to move up and down. Inside the cylindrical portion 62 of the elbow post J, there is provided an elevation position changing mechanism (not shown) capable of changing the elevation position of the armrest main body K by operating the elevation operation button 63b arranged on the armrest support portion 63. there is

<armrest body K>
The armrest body K includes an armrest support portion 63 having a columnar portion (not shown) held by the tubular portion 62 and an armrest 64 supported on the armrest support portion 63 . The elbow rest 64 is configured to be slidable relative to the elbow rest support portion 63 by the elbow rest guide mechanism L. As shown in FIG. That is, between the armrest support portion 63 and the armrest 64, there is provided an armrest guide mechanism L for sliding the armrest 64 between the most advanced position (z) and the most retracted position (k) on a predetermined track. is provided.

[Elbow support part 63]
The elbow rest support portion 63 includes a vertically extending columnar portion arranged on the cylindrical portion 62 of the elbow support J, and a support base 63a arranged on the columnar portion. The support base 63a is set larger in the front-rear direction than the columnar portion. The support base 63a is configured to slidably support the elbow rest 64 from below.

The support base 63a is provided with a first guide slit 63c that can guide the elbow rest 64 along a predetermined track on the upper surface side. The first guide slit 63c is provided in the front portion of the support base 63a. The first guide slit 63c has a curved shape that is convex toward the inner side, that is, the middle portion of the chair body in the left-right direction in a plan view. The front end of the first guide slit 63c is positioned inside the rear end of the first guide slit 63c. The first guide slit 63c engages with a movable guide shaft 64e projecting from the elbow rest 64. As shown in FIG.

The support base 63a is provided with a fixed guide shaft 63d protruding upward behind the first guide slit 63c. The fixed guide shaft 63d cannot move back and forth with respect to the elbow support J. As shown in FIG. The fixed guide shaft 63d is attached to the rear end of the support base 63a. The fixed guide shaft 63d is positioned outside the front end of the first guide slit 63c and inside the rear end of the first guide slit 63c in plan view. A roller 63e is rotatably mounted on the fixed guide shaft 63d. The roller 63e engages with a surrounding wall 64f that surrounds the peripheral edge of a second guide slit 64d provided in the elbow rest base 64c, so that the fixed guide shaft 63d can move smoothly relative to the second guide slit 64d. It's like

[Elbow pad 64]
The elbow rest 64 can slide on the elbow rest supporting portion 63 along a predetermined track. The elbow rest 64 takes a forward posture (ms) facing forward and backward at the most advanced position (z) and the most retracted position (k). The armrest 6 is set so that the armrest 64 at the most retracted position (k) in a plan view is located farther from the central portion in the left-right direction of the chair body than the armrest 64 at the most forward position (z). As shown in FIG. 40, the imaginary center line cs of the elbow rest 64 at the most retracted position (k) is positioned outside the imaginary center line cs of the elbow rest 64 at the most advanced position (z). .

The elbow rest 64 includes an elbow rest cushion 64a arranged on the top, a cushion receiver 64b attached below the elbow rest cushion 64a, and an elbow rest base 64c arranged below the cushion receiver 64b.

The elbow rest base 64c is formed with a second guide slit 64d extending vertically through the rear portion thereof. A second guide slit 64d is provided in the rear half of the elbow rest base 64c. The second guide slit 64d has a curved shape that is convex toward the inner side, that is, the middle portion of the chair body in the left-right direction in a plan view. The front end of the second guide slit 64d is positioned inside the rear end of the second guide slit 64d. The second guide slit 64 d engages with a fixed guide shaft 63 d projecting from the support base 63 a of the armrest support portion 63 .

The elbow rest base 64c is provided with a movable guide shaft 64e that protrudes forward and downward beyond 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 rest 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 positioned 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 to move back and forth between the most advanced position (z) and the most retracted position (k) via an intermediate position (c).

In this embodiment, as shown in FIG. 41, the armrest 64 has the front end positioned innermost and the rear end positioned outermost at the intermediate position (c) by the action of the armrest guide mechanism L. It takes an inward posture (us).

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

The detailed operation of the elbow rest 64 by the elbow rest guide mechanism L is as follows.

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

In this embodiment, the cooperation between the first guide slit 63c, which is a fixed slit provided in the elbow rest support portion 63, and the movable guide shaft 64e provided in the elbow rest 64, and the movable guide shaft 64e provided in the elbow rest 64 The second guide slit 64d, which is a slit, cooperates with the fixed guide shaft 63d provided in the armrest support portion 63 to move the armrest 64, which receives the operation force from the user, to the most forward position (z) and the last position. It is slidable between the retracted position (k).

Specifically, the slide track of the front end portion of the elbow rest 64 is set in a mountain-like shape convex inward, as indicated by the thick line shown in FIG. The slide track of the rear end portion is set in a mountain shape that protrudes outward, as indicated by the thick line in FIG. 41 . According to the slide path set by the armrest guide mechanism L, the armrest 64 moves back and forth and rotates (swings). As a result, when the armrest 64 is positioned at the intermediate position (c), the front end portion is positioned closest to the central portion of the chair body in the left-right direction.

The elbow rest 64 takes the same posture at the most forward position (z) and the most retracted position (k), that is, the forward facing posture (ms) facing the front-rear direction. The armrest 6 is set so that the armrest 64 at the most retracted position (k) in a plan view is located farther from the central portion in the left-right direction of the chair body than the armrest 64 at the most forward position (z). That is, the first guide slit 63c formed in the support base 63a of the elbow rest support portion 63 and the second guide slit 64d formed in the elbow rest base 64c of the elbow rest 64 are convex inward. The position of the armrest 64 in the left-right direction with respect to the armrest support portion 63 is set so that the front end is closer to the center of the chair body in the left-right direction than the rear end. is at the most advanced position (z) and at the most retracted position (k).

The position of the elbow rest 64 at the most retracted position (k) is set outside the position of the elbow rest 64 at the most advanced position (z). For this reason, when the chair adopts a backward tilting posture, by positioning the elbow pads 64 at the most retracted position (k), the user can use the elbow pads 64 to relax the smartphone, tablet terminal, or the like. It is available for viewing.

On the other hand, the position of the elbow rest 64 at the most advanced position (z) is set to be positioned inside the position of the elbow rest 64 at the most retracted position (k). That is, in a normal working posture, the elbow rest 64 at the most forward position (z) is not excessively spaced outward. For this reason, the elbow rest 64 at the most advanced position (z) is relatively close to the user and can be positioned at a suitable location that is easy for the user to use for keyboard operation, writing work, and the like.

The elbow rest guide mechanism L in this embodiment has a first guide slit 63c on the side of the elbow rest support portion 63, and a second guide slit, which is a single slit, is provided on the side of the elbow rest base 64c. A configuration is realized in which only the armrest 64d is required, and the rigidity of the armrest base 64c can be easily increased.

In other words, in the conventional one, a plurality of slits are arranged in a member corresponding to the armrest base 64c in this embodiment, and a plurality of fixing members are arranged in a member corresponding to the support base 63a in this embodiment so as to correspond to the plurality of slits. It was assumed that a guide shaft was arranged. However, in the conventional one, a plurality of slits are formed in a member corresponding to the armrest base 64c, so there is a low degree of freedom in designing to maintain strength (especially in the portion located between the plurality of slits). It was a thing. In the chair of this embodiment, it is sufficient to provide only the second guide slit 64d, which is a single guide slit, in the armrest base 64c. 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 main body M includes a clothing support portion 71 extending in the left-right direction and capable of suspending and supporting the clothing, and a base portion 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 shape extending in the left-right direction that can mainly support clothing. The clothing support portion 71 has a shape that is gently curved so as to protrude upward.

[Base 72]
The base portion 72 includes vertically extending portions 72a arranged in pairs in the left and right directions and connecting portions 72f connecting 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. As shown in FIG. An engagement groove 72c used to hold the hanger main body M at the upper position and the lower position is provided on the inner surface side of the held portion 72b. Protuberant portions 72d protruding inward are formed in the vicinity of the upper end portion and the lower end portion of the engaging groove 72c. The tip portions of a pair of left and right pushers 75c provided on the hanger mounting member N and elastically biased outward move relative to each other in the engagement groove 72c and climb over the protruding portion 72d, thereby moving the hanger main body M. It can be held in an upper position or a lower position with respect to the hanger mounting member N. The pair of left and right pressers 75c are arranged inside the held portions 72 of the hanger main bodies M that form 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 that protrudes rearward so as to avoid interference with the columnar back support 4. As shown in FIG. Between the connecting portion 72f and the back support 4, a gap sk is formed into which the user's fingers can be inserted. The connecting portion 72f of the hanger main body M can function as an operating handle that can be gripped by the user to move the entire chair with respect to the floor surface.

<Hanger mounting member N>
The hanger mounting member N includes a member main body 73 arranged on the back side of the back outer shell E, an engaging member 74 supported so as to be relatively movable in the lateral direction with respect to the member main body 73, and the hanger main body M at an upper position. Alternatively, it has a holding member 75 that can be held in the lower position. In addition, the hanger mounting member N has a detent mechanism 76 that restricts the return of the engaging member 74 at the engaging position (g) to the insertable position (a), and an engaging member at the engaging position (g). A screwing mechanism 77 is provided for firmly attaching the member 74 to the spine outer shell E. As shown in FIG.

[Member body 73]
The member main body 73 has an outer shape that forms a substantially downward U-shape when viewed from the front. The member main body 73 is formed symmetrically. The front end portion of the member main body 73 is set so as to contact the rear surface of the back outer shell E when attached to the back outer shell E. As shown in FIG. On both left and right sides on the front side of the member main body 73, there are provided housing portions 73a capable of housing the base portion 74a of the engaging member 74 so as to be slidable in the left-right direction. 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 housing portions 73a, respectively. Each engaging member 74 is drawn toward the member main body 73 by screwing a screw v1 inserted through the screw insertion hole 73b into a nut 74g provided on the engaging member 74. As shown in FIG. An engaging projection 73c which is elastically deformable in the vertical direction and protrudes upward is provided at the lower end of the housing portion 73a. A plurality of positioning protrusions 73d projecting forward are provided at the upper end portion of the member main body 73 . The positioning protrusion 73d is positioned inside the through hole 51a of the back outer shell E. As shown in FIG.

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

The engaging members 74 are provided in pairs. That is, the engaging members 74 are provided in pairs on the right and left sides of the member main body 73 . The paired engaging members 74 are movable in opposite directions. In this embodiment, the engaging member 74 on the left side in a front view has an insertable position (a) at the right inner position, and an engaging position (g) at the left outer position. On the other hand, as viewed from the front, the engaging member 74 on the right side has an insertable position (a) on the inner left position, and an engaging position (g) on the outer right position.

The engaging member 74 includes a base portion 74a held inside the member main body 73, that is, in a housing portion 73a of the member main body 73, a plurality of front extending portions 74e projecting forward from the base portion 74a, and a plurality of front extending portions 74e. It has a plurality of back plate engaging portions 74f extending from the front end portion in a direction substantially perpendicular to the front extending portion 74e. The front extending portion 74e and the back plate engaging portion 74f form an L-shaped hook. In other words, the front extending portion 74e and the back plate engaging portion 74f form an engaging hook that engages the back outer shell E. As shown in FIG.

The base portion 74a has a plate shape. A press operated portion 74b is provided on the inner side surface of the lower portion of the base portion 74a to be pressed when the user performs the mounting work. When the engaging member 74 is at the insertable position (a), the press operated portion 74b protrudes inward from the accommodating portion 73a of the member main body 73 in a rear view. The user can press the pressed portion 74b with a finger or the like outward, ie, in the direction in which the engaging member 74 moves outward, to move the engaging member 74 to the engaging position (g). When the engaging member 74 is positioned at the engaging 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 contacts, smoothly continues to the edge of the member main body 73. It's like

The base portion 74a has a nut holding hole 74c recessed on the front side. A nut 74g is held in the nut holding hole 74c. At the lower end of the base portion 74a, recesses 74d are provided so as to be spaced apart from each other in the left and right direction, with which the engaging projections 73c provided on the member main body 73 can be engaged. These concave portions 74d can be engaged with the engaging protrusions 73c provided on the member main body 73 when the engaging member 74 is at the engaging position (g) or the insertable position (a).

The front extending portion 74e is in the shape of a laterally long column that stands forward from the front surface of the outer portion of the base portion 74a. The front extending portions 74e are erected at a plurality of locations, ie, three locations, at predetermined intervals in the vertical direction. The standing position of the front extending portion 74e in the base portion 74a corresponds to the through hole 51a provided in the back outer shell E at a predetermined position. In this embodiment, the sizes of the front extensions 74e vertically aligned on the base 74a are different, and the distances between the adjacent front extensions 74e are also different. Therefore, the hanger 7 can only be attached to the back outer shell E at a specific position. That is, the plurality of through-holes 51a provided in the back outer shell E are not all set to have the same size and distance from other adjacent through-holes 51a. Therefore, the user can attach the hanger 7 only to the appropriate position on the back outer shell E where the hanger 7 should be attached. That is, the hanger 7 can be attached to the back outer shell E only at positions 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 the front end portion of the front extension portion 74e, substantially perpendicular to the front extension portion 74e. The back plate engaging portion 74f is set to have a size smaller than the through hole 51a of the back outer shell E into which the back plate engaging portion 74f is to be inserted. The back plate engaging portion 74f has a laterally 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 positioned at the front side of the back outer shell E. As shown in FIG. The back plate engaging portion 74f can be moved to the engaging position (g) where it can be engaged with the back outer shell E by operating the engaging member 74 from the rear side.

Since the back plate engaging portion 74f is provided integrally with the front extending portion 74e, the back plate engaging portion 74f is arranged at a plurality of locations, ie, three locations, at predetermined intervals in the vertical direction. The position where the back plate engaging portion 74f is arranged corresponds to the through hole 51a provided in the back outer shell E at a predetermined position. In this embodiment, the back plate engaging portions 74f arranged in a row in the vertical direction have different sizes, and the distance between adjacent back plate engaging portions 74f also differs. Therefore, the hanger 7 can only be attached to the back outer shell E at a specific position.

[Holding member 75]
The holding member 75 has a holding recess 75a capable of holding the hanger main body M, and is attached to the back side of the member main body 73 by means of mounting screws 75b. The holding member 75 is set to have the same width dimension as the width dimension of the member main body 73 . The holding member 75 is provided with a left and right pair of pressers 75c which are urged outward by a spring (not shown) and whose tips press against the engagement grooves 72c of the hanger body M. As shown in FIG.

[Detent mechanism 76]
The detent mechanism 76 can restrict the return of the engaging member 74 at the engaging position (g) to the insertable position (a).

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

[Screw mechanism 77]
The screwing mechanism 77 is for attaching the back outer shell E and the hanger 7 more firmly. The screw mechanism 77 includes a screw v1, a screw insertion hole 73b provided in the member main body 73, and a nut 74g provided on the engaging member 74 to which the screw v1 inserted through the screw insertion hole 73b is screwed. It is. By inserting the screw v1 into the screw insertion hole 73b and screwing it into the nut 74g, the engaging member 74 is brought into close contact with the back outer shell E and firmly fixed at the engaging position (g). Returning to the insertable position (a) is restricted.

The screwing mechanism 77 allows the screw v1 to be inserted through the screw insertion hole 73b and screwed onto the nut 74g only when the engaging member 74 is positioned at the engaging position (g). That is, only when the engaging member 74 is positioned at the engaging position (g), the position of the screw insertion hole 73b and the position of the nut 74g can match. In other words, unless the engaging member 74 is properly moved from the insertable position (a) to the engaging position (g), the screw v1 cannot be inserted through the screw insertion hole 73b. . Therefore, the engaging member 74 that can move relative to the member main body 73 can be moved to an appropriate position where the hanger 7 can be reliably attached to the backrest 5 .

<<Headrest 8>>
The headrest 8 is attached to the backrest 5 and can support the head of the seated person from behind. The headrest 8 is configured to be mounted on the front side of the back inner shell F only when a type with a short vertical dimension (low back type (LB)) is selected as the back inner shell F. The headrest 8 is covered with an upholstery material H that covers the back inner shell F. As shown in FIG.

The headrest 8 includes a headrest main body with which the head of a seated person can come into contact, and an attachment member Q provided continuously under the headrest main body. The attachment member Q is attached to the back inner shell F using screws inserted at appropriate positions.

<Headrest body P>
The headrest main body P can support the head of the seated person from the rear side. The headrest main body P is formed with a plurality of slits extending in the left-right direction. The headrest main body P has a rectangular shape with a width dimension set to be approximately the same as the lateral width dimension of the upper portion of the back inner shell F when viewed from the front. In a side view, the headrest body P has a curved shape in which the middle portion in the vertical direction protrudes forward. In other words, the headrest main body P has a shape protruding forward from the front surface of the back inner shell F. As shown in FIG.

<Mounting member Q>
The mounting member Q is a plate-like member that extends downward from the lower end portion of the headrest main body P. As shown in FIG. The attachment member Q abuts on the front surface of the back inner shell F and is fixed to the back inner shell F by a screw as a fastener. A central portion of the lower portion of the mounting member Q is notched so as to avoid the plate spring portion 54 . Positioning projections 81 projecting rearward are formed on the left and right of the lower end of the mounting member Q. As shown in FIG. These positioning projections 81 are fitted into the positioning holes 53f (with the closing 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. It will be.

Thus, the chair shown in this embodiment has the upholstery material H including the upholstery material 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 the back inner shell is attached by fastening tools such as staples st. attached to F. For this reason, local creases in the upholstery material body 57 are less likely to occur at the side edges of the back inner shell F, and the occurrence of irregularities in the cushion material 57b can be suppressed. It is possible to provide a backrest 5 with an appearance.

The chair has a backrest 5 supporting a back inner shell F on the front side of the back outer shell E. - 特許庁A plate spring portion 54 is projected from the back inner shell F. As shown in FIG. Therefore, the back inner shell F has a structure capable of appropriately repelling the load of the seated person.

The chair can support a plurality of back inner shells F with different height dimensions on a common back outer shell E. - 特許庁Therefore, it is possible to provide a chair with a high degree of freedom in designing the backrest 5 with 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, they can provide the seated occupant with a suitable reclining comfort, and the portion that overlaps with the back outer shell E is The backrest 5 can be designed to cooperate with the back outer shell E to ensure the necessary rigidity.

The chair has an operation member C for sliding the seat body B back and forth with respect to the seat outer shell A that receives the seat. By attaching the cap 36 constituting the operating member C to the engaging member 35 constituting the operating member C, 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 slipping out of the seat outer shell A. As shown in FIG. Therefore, a suitable structure for preventing the seat body B from slipping out of the seat outer shell A can be adopted.

The chair is provided with a recessed portion 34a opened downward corresponding to the seat center slit 33d on the lower surface side of the seat cushion 34. As shown in FIG. Therefore, the cushioning property of the seat cushion 34 can be made less likely to give a feeling of bottoming out and excellent in contractility, and can be made in a state suitable for the seated person. When the seat cushion 34 is compressed, the air existing in the recess 34a of the seat cushion 34 smoothly escapes to the outside through the seat center slit 33d. The cushion 34 is suitably collapsible.

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. - 特許庁

The chair is set so that the armrest 64 at the most retracted position (k) in a plan view is located farther from the center of the chair body in the left-right direction than the armrest 64 at the most forward position (z). For this reason, the elbow rest 64 can be preferably used in the most retracted position (k) in the backward leaning posture, and the elbow rest 64 is preferably in the most forward position (z) and the most retracted position (k). It is a thing.

As described in detail above, the chair in this embodiment is configured so that the optional hanger 7 can be attached using the through hole 51a provided in the back outer shell E, which is the 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. The hanger mounting member N includes a member main body 73 arranged on the back side of the back outer shell E, and an engaging member 74 supported so as to be relatively movable with respect to the member main body 73 . The engaging member 74 is provided with a back plate engaging portion 74f which is inserted into the through hole 51a from the back side and can be positioned on the front side of the back outer shell E after being inserted. Therefore, it is possible to provide a chair in which the hanger 7, which is an option, can be flexibly attached to the back outer shell E, which is a back plate, from the back side of the back outer shell E.

That is, the engaging member 74 has a back plate engaging portion 74f that is inserted into the through hole 51a from the back side and can be positioned on the front side of the back outer shell E after being inserted. Therefore, when attaching the hanger 7 to the back outer shell E, the operator does not need to access the front side of the back outer shell E. - 特許庁That is, the operator does not need to arrange a special part for attaching the hanger 7 to the front side of the back outer shell E. Therefore, the operator can attach the hanger 7 to the back outer shell E without placing his/her hands on the front side of the back outer shell E. As shown in FIG.

The back plate engaging portion 74f can be moved to the engaging position (g) where it can be engaged with the back outer shell E by operating the engaging member 74 from the rear side. Therefore, the hanger 7 can be attached only by operation from the back side of the back outer shell E, which is preferable.

The engaging member 74 has an insertable position (a) at which the back plate engaging portion 74f can be inserted into the through hole 51a, and an engaging position (g) at which the back plate engaging portion 74f can be engaged with the back outer shell E. , so as to be movable in the left-right direction with respect to the member main body 73 . Therefore, the hanger 7 can be attached to the back outer shell E by moving the engaging member 74 in the left-right direction for easy operation by the operator.

The engaging member 74 has an insertable position (a) at which the back plate engaging portion 74f can be inserted into the through hole 51a, and an engaging position (g) at which the back plate engaging portion 74f can be engaged with the back outer shell E. relative to the member main body 73 between. A pair of engaging members 74 are provided on the member main body 73 . A pair of engaging members 74 can move in opposite directions. Therefore, the back plate engaging portions 74f of the paired engaging members 74 are inserted into the through holes 51a of the back outer shell E, and can be positioned at appropriate positions where they are difficult to separate from the back outer shell E. Become.

The engaging member 74 includes a base portion 74a held within the member main body 73, a front extension portion 74e projecting forward from the base portion 74a, and a front end portion of the front extension portion 74e substantially orthogonal to the front extension portion 74e. and a back plate engaging portion 74f extending in the direction of . Therefore, the engaging member 74 can move appropriately relative to the member main body 73, and engages with the back outer shell E after the back plate engaging portion 74f passes through the through hole 51a of the back outer shell E. It has a proper structure.

The front extending portion 74e and the back plate engaging portion 74f form a hook shape. Therefore, the engaging member 74 realizes a suitable form for engaging with the back outer shell E by the forward extending portion 74e and the back plate engaging portion 74f.

The member main body 73 has a screw insertion hole 73b, and by screwing a screw v1 inserted through the screw insertion hole 73b into a nut 74 provided on the engaging member 74, the engaging member 74 is moved toward the member main body 73 side. It is something that can be attracted to. Therefore, the hanger mounting member N can be appropriately engaged with the back outer shell E by adjusting the relative position of the engaging member 74 with respect to the member main body 73 .

The engaging member 74 has an insertable position (a) at which the back plate engaging portion 74f can be inserted into the through hole 51a, and an engaging position (g) at which the back plate engaging portion 74f can be engaged with the back outer shell E. relative to the member main body 73 between. A detent mechanism 76 is provided to prevent the engaging member 74 at the engaging position (g) from returning to the insertable position (a). Therefore, the hanger 7 is appropriately prevented from coming off the back outer shell E unexpectedly.

A screwing mechanism 77 is provided which includes a screw insertion hole 73b provided in the member main body 73 and a nut 74g provided on the engaging member 74 to which the screw v1 inserted through the screw insertion hole 73b is screwed. The screwing mechanism 77 is configured so that the screw v1 can be inserted into the screw insertion hole 73b and attached to the nut 74g only when the engaging member 74 is positioned at the engaging position (g). Therefore, the operator can fix the engaging member 74 to the member main body 73 via the screw v1 while the engaging member 74 is reliably positioned at the engaging position (g). .

In addition, this invention is not limited to embodiment detailed above.

Options are not limited to hangers. Options include, for example, headrests, hooks for hanging luggage, containers that can hold small items, top plates that can hold small items, fixture holding devices that can hold lighting fixtures, etc. can be mentioned.

Various aspects of the back plate can be applied, and the back plate is not limited to the back outer shell shown in the above-described embodiments.

Various forms can be applied to the size and form of the through-holes, and are not limited to those shown in the above-described embodiments.

The position at which the option is attached is not limited to the central portion of the back plate, and it may be attached at an appropriate location as long as the through hole can be used.

A part of the back plate engaging portion may be located outside the opening edge of the through hole at the engaging position.

A single engaging member may be provided, or two or more engaging members may be provided.

Of course, the front side of the chair back may be accessible to the operator to install the option.

The engaging member may be any member that can move relative to the member main body, and is not limited to one that can slide in the left-right direction. For example, the engaging member may rotate with respect to the member body.

A pair of engaging members may not necessarily be movable in opposite directions.

When the paired engaging members move in opposite directions, the moving direction may be up and down, left and right, obliquely, or rotationally. The directions in which the paired engaging members are opposed to each other may be the directions in which they approach each other or the directions in which they separate from each other.

The detent mechanism may have any specific configuration as long as it can restrict the engagement member in the engagement position from returning to the insertable position.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the scope of the present invention.

E... Back outer shell (back plate)
51a... Through hole 7... Hanger (optional)
M... Hanger main body (optional main body)
N... Hanger mounting member (optional mounting member)
73... Member body 74... Engaging member 74f... Back plate engaging portion

Claims (7)

A chair configured so that an option can be attached using a through hole provided in the back plate,
the option comprises an option body and an option mounting member for mounting the option body to the back plate;
The option mounting member comprises a member main body arranged on the back side of the back plate, and an engaging member supported so as to be relatively movable with respect to the member main body,
The engaging member is provided with a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after being inserted ,
The engaging member includes a base held in the member main body, a front extension projecting forward from the base, and extending from the front end of the front extension in a direction substantially perpendicular to the front extension. and said extended back plate engaging portion . A chair configured so that an option can be attached using a through hole provided in the back plate,
the option comprises an option body and an option mounting member for mounting the option body to the back plate;
The option mounting member comprises a member main body arranged on the back side of the back plate, and an engaging member supported so as to be relatively movable with respect to the member main body,
The engaging member is provided with a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after being inserted ,
The member main body has a screw insertion hole, and the engagement member can be drawn toward the member main body by screwing a screw inserted through the screw insertion hole into a nut provided on the engagement member. Chair. A chair configured so that an option can be attached using a through hole provided in the back plate,
the option comprises an option body and an option mounting member for mounting the option body to the back plate;
The option mounting member comprises a member main body arranged on the back side of the back plate, and an engaging member supported so as to be relatively movable with respect to the member main body,
The engaging member is provided with a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after being inserted ,
The engaging member is attached to the member main body between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engaging position at which the back plate engaging portion can be engaged with the back plate. can move relative to
a detent mechanism for restricting the engaging member at the engaging position from returning to the insertable position;
A screwing mechanism is provided that includes a screw insertion hole provided in the member main body and a nut provided on the engaging member to which the screw inserted through the screw insertion hole is screwed. However, only when the engaging member is positioned at the engaging position, the screw can be inserted into the screw insertion hole and attached to the nut . A chair configured so that an option can be attached using a through hole provided in the back plate,
the option comprises an option body and an option mounting member for mounting the option body to the back plate;
The option mounting member comprises a member main body arranged on the back side of the back plate, and an engaging member supported so as to be relatively movable with respect to the member main body,
The engaging member is provided with a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after being inserted ,
The engaging member is attached to the member main body between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engaging position at which the back plate engaging portion can be engaged with the back plate. A chair configured to be movable in the left-right direction . A chair configured so that an option can be attached using a through hole provided in the back plate,
the option comprises an option body and an option mounting member for mounting the option body to the back plate;
The option mounting member comprises a member main body arranged on the back side of the back plate, and an engaging member supported so as to be relatively movable with respect to the member main body,
The engaging member is provided with a back plate engaging portion that is inserted into the through hole from the back side and can be positioned on the front side of the back plate after being inserted ,
The engaging member is attached to the member main body between an insertable position at which the back plate engaging portion can be inserted into the through hole and an engaging position at which the back plate engaging portion can be engaged with the back plate. can be moved in the left-right direction relative to the
The chair , wherein the engaging members are provided in pairs on the member body, and the paired engaging members can move in opposite directions . 2. The chair according to claim 1 , wherein said front extending portion and said back plate engaging portion form a hook-like configuration. 7. The back plate engaging portion according to claim 1 , 2, 3, 4, 5, or 6, wherein the back plate engaging portion can be moved to an engaging position where it can be engaged with the back plate by operating the engaging member from the rear side. Chair.

Images