JP6428182B2 - Chair - Google Patents

Description

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

  Conventionally, a chair having an armrest on a seat is known (see, for example, Patent Document 1). Many armrests have an elbow rest surface facing upward, and basically have a substantially flat shape in a side view.

  However, when the armrest is supported by a seat that can be tilted between the standard position and the forward tilt position, the entire armrest is interlocked with the forward tilt of the seat. For this reason, when the seat is in the forward tilt position, the entire elbow rest surface is tilted forward.

  Even if the seated person sits on a seat in a forward tilt position, the seat or head part may be held upright with respect to the floor surface, so the conventional seat is tilted forward. In some cases, the orientation of the elbow rest surface was not necessarily suitable for the seated person.

JP 2014-90996 A

  The present invention has been made paying attention to the above-described circumstances. In the chair supported by a seat that can be tilted between a standard position and a forward tilt position or a member that tilts together with the seat, An object of the present invention is to provide a seat with an elbow rest surface that can contribute to comfortable use even for a seated person sitting in a seat in an inclined position.

  That is, the present invention has the following configuration.

The chair according to claim 1 is a chair provided with an armrest having an elbow rest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat. The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. When the seat is in a forward tilt position, the second elbow rest surface portion is closer to the horizontal than the first elbow rest surface portion when the seat is in a forward tilt position , and the armrest is An elbow rest having the elbow rest surface on the upper surface, wherein the elbow rest includes an elbow support member and an elbow pad mainly composed of a cushion member provided on the elbow support member. And the elbow pad corresponds to the first elbow rest surface portion. Those that are set thicker than the thickness of the portion of the position of the thickness corresponding to the second elbow surface.

The chair according to claim 2 includes a seat that can tilt at least from a standard position to a forward tilt position, and is provided with an armrest having an armrest surface on the seat or a member tilting together with the seat, The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. When the seat is in a forward tilt position, the second elbow rest surface portion is closer to the horizontal than the first elbow rest surface portion when the seat is in a forward tilt position, and the armrest is The elbow rest having the elbow rest surface on the upper surface, the elbow rest comprising an elbow rest member and an elbow pad provided on the elbow rest member, The area visible from the outside on the peripheral surface of the elbow pad is made substantially constant. In which is provided with a peripheral edge portion.

The chair according to claim 3 is a chair provided with an armrest having an elbow rest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat. The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. When the seat is in a forward tilt position, the second elbow rest surface portion is closer to the horizontal than the first elbow rest surface portion when the seat is in a forward tilt position, and the armrest is And an elbow strut supported by the seat or a member that tilts forward together with the seat, and the elbow rest provided on the elbow strut so that the position can be changed in the front-rear direction .

The chair according to claim 4 includes a seat that can tilt at least from a standard position to a forward tilt position, and is provided with an armrest having an armrest surface on the seat or a member that tilts together with the seat, The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. When the seat is in a forward tilt position, the second elbow rest surface portion is closer to the horizontal than the first elbow rest surface portion when the seat is in a forward tilt position, and the armrest is An elbow frame attached to the seat or a member that tilts forward together with the seat, an elbow strut held by the elbow frame, and the elbow rest provided on the elbow strut, The elbow frame has a cylindrical portion that holds the elbow post, and this Is a vertically intermediate position is connected to the proximal end of the Jo portion that a mounting arm attached to a member tilted forward with the seat or the seat.

The chair according to claim 5 is the configuration according to claim 1, 2, 3 or 4, wherein the elbow rest surface is arranged such that the second elbow rest surface portion is continuous with the second elbow rest surface portion. It is a thing.

  As described above, according to the present invention, an armrest is seated on a seat in a forward tilt position in a chair supported by a seat that can tilt between a standard position and a forward tilt position or a member that tilts together with the seat. It is possible to provide a seated person having an elbow rest surface that can contribute to comfortable use.

The perspective view which shows one Embodiment of this invention. The left view in the embodiment. The rear view in the embodiment. The top view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The perspective view in the embodiment. The AA line partial expanded sectional view in FIG. Sectional drawing corresponding to FIG. 9 which shows the state which has a seat in the forward leaning attitude | position. The partial expansion perspective view in the embodiment. The side view for operation | movement explanation of the seat forward inclination means in the embodiment. The side view for operation | movement explanation of the seat forward inclination means in the embodiment. The side view for operation | movement explanation of the seat forward inclination means in the embodiment. The top view for operation | movement description of the seat forward inclination means in the embodiment. The top view for operation | movement description of the seat forward inclination means in the embodiment. The exploded perspective view in the embodiment. The front view in the embodiment. BB sectional drawing in FIG. CC sectional view taken on the line in FIG. The exploded perspective view in the embodiment. The DD sectional view taken on the line in FIG. The disassembled perspective view which shows an armrest.

  Hereinafter, an embodiment in which the present invention is applied to an office swivel chair C equipped with a synchro-rocking mechanism R will be described with reference to FIGS.

  This chair C is obtained by mounting an armrest 6 on a chair body C1.

  The chair body C1 includes a leg 1, a support base 2 that is supported on the top of the leg 1 and can be turned horizontally, a seat 3 supported on the support base 2, and a back frame 4 on the support base 2. And a backrest 5 supported so as to be able to tilt backward.

  The chair body C1 is configured such that the seat 3 and the backrest 5 are tiltably supported by the support base 2, and the seat 3 and the backrest 5 are synchronized by the action of the synchro-rocking mechanism R, and FIG. In this embodiment, the backrest 5 is supported by the function of the forward seat tilting means G, which will be described later, in addition to the standard posture (S) and the reclining posture (L) as shown in FIG. The seat 3 can be tilted from a standard position (A) as shown in FIG. 9 to a forward tilt position (B) as shown in FIG. .

<Leg 1>
The leg body 1 includes a leg blade type leg base B11 having casters and a leg column 12 erected at the center of the leg base B11. The leg support 12 is a normal one mainly composed of a gas spring, and the support base 2 is attached to the upper end of the leg support 12.

<Support base 2>
The support base 2 is supported by the leg body 1 so as to be horizontally rotatable and vertically movable, and is inserted into the housing 21 mounted on the leg column 12 and both side walls 211 of the housing 21. A main shaft 22 for supporting the backrest 5 and a reaction force receiving shaft 231 provided at the first rotation end so as to be rotatable around the main shaft 22 and mounting the back frame 4 on the second rotation end. A synchro frame 23 provided with a mounting portion 232, and a tilting reaction force generating mechanism 24 that urges the reaction force receiving shaft 231 of the synchro frame 23 to generate an elastic repulsive force with respect to the backward tilting operation of the backrest 5. It comprises.

  The housing 21 is formed with a long hole 212 at a front end portion of both side walls 211 for supporting a front shaft F which is a front connecting member described later so as to be slidable in the front-rear direction.

  The sync frame 23 is a pair of plate-shaped sync frame main bodies 233 provided on both sides of the housing 21 and the reaction force receiver connecting the first rotating ends of the left and right sync frame main bodies 233. A shaft 231, the attachment portion 232 provided to extend outward from the second rotation end of each synchro frame main body 233, and an upper portion extended from an intermediate portion of each synchro frame main body 233. A shaft holding portion 234 and a rear shaft 235 which is a connecting member after being supported by both the shaft holding portions 234 are provided. A screw hole is formed in the mounting portion 232, and a back support rod 41 of the back frame 4 described later is fixed to the synchro frame 23 by a bolt v1 screwed into the screw hole.

  The tilt reaction force generation mechanism 24 is configured to apply an elastic repulsion force to the reaction force receiving shaft 231 of the synchro frame 23 using a coil spring 241, but is detailed because it is a normal one. The detailed explanation is omitted.

<Seat 3>
The seat 3 includes an outer shell 31 disposed on the support base 2 and a seat body 32 having an inner shell 321 provided on the outer shell 31. Between the outer shell 31 and the inner shell 321, a slide guide mechanism 33 for sliding the inner shell 321 back and forth with respect to the outer shell 31, and the inner shell 321 moved to a desired sliding position. A slide positioning mechanism 34 is provided for locking.

  The outer shell 31 has a large number of reinforcing ribs on the upper surface and is provided with a mounting window 311 for mounting a base B of a seat forward tilting means G described later at the center of the front end. Further, the outer shell 31 has a shaft support portion 312 protruding from the lower surface side of the rear end portion so as to rotatably support both end portions of the rear shaft 235.

  The seat body 32 includes an inner shell 321 disposed on the outer shell 31 so as to be slidable in the front-rear direction via a slide guide mechanism 33, a cushion 322 disposed on the inner shell 321, and the cushion. 322 and a seat skin material 323 that wraps around the lower surface of the peripheral edge of the inner shell 321.

  The inner shell 321 has a plurality of slits 324 and is formed of a resin and has a substantially rectangular shape in plan view. The inner shell 321 is arranged to be slidable in the front-rear direction within a predetermined range with respect to the outer shell 31 via the slide guide mechanism 33.

  The slide guide mechanism 33 includes a slide guide slit 325 formed at a plurality of locations of the inner shell 321 and a slider (not shown) attached to the outer shell 31, and the inner shell 321 is connected to the outer shell 31. On the other hand, it can be slid in the front-rear direction. The inner shell 321 that is guided by the slide guide mechanism 33 and slides in the front-rear direction is locked at a desired slide position by the slide positioning mechanism 34.

  The slide positioning mechanism 34 includes an operation member 341 that can be moved up and down, and a plurality of positioning engaging portions 342 that selectively correspond to the operation member 341 as the inner shell 321 slides. Is. That is, by operating the operation member 341 supported by the outer shell 31 upward, the seat body 32 is moved back and forth with respect to the outer shell 31 and the hand is released from the operation member 341 and lowered. The operating member 341 is engaged with the engaging portion 342 of the outer shell, so that the seat body 32 can be locked at a desired position.

  The cushion 322 is obtained by pasting a non-woven fabric on the lower surface of molded urethane, for example. The cushion 322 is mounted on the upper surface of the inner shell 321 and is wrapped by the seat skin material 323 made of cloth or the like together with the peripheral edge of the inner shell 321.

  The seat 3 described above has the front portion supported by the support base 2 via the front shaft F which is a front connecting member, and the rear portion of the seat 3 is held by the rear shaft 235 which is a rear connecting member. The support base 2 is supported, and the forward tilt degree of the seat 3 with respect to the support base 2 is separated from the tilt of the backrest 5 between the front portion of the seat 3 and the support base 2. A seat forward tilting means G for adjusting is interposed.

<Seat tilting means G>
The seat front tilting means G has a front shaft F that is the connecting member that connects the front portion of the support base 2 and the front portion of the seat 3, and changes the connection position of the seat 3 and the front shaft F. Thus, the height of the front portion of the seat 3 from the floor surface is changed, and the entire seat 3 is integrally tilted forward, and the connecting position is a height from the floor surface of the seat 3. The positions are set at a plurality of different positions, and these connection positions can be selectively switched. In this embodiment, in the base B that can move up and down integrally with the seat 3, the first connecting position where the front shaft F is located below the lock member L1 and the first shaft where the front shaft F is located above the lock member L. Two connection positions of the two connection positions can be selectively taken.

  More specifically, the chair C in this embodiment is configured to rotate about the rear part of the seat 3 so that the front part of the seat 3 can be rotated downward. The seat front tilting means G holds the front shaft F in a specific position by changing the positional relationship between a plurality of components that are engaged with the front shaft F, that is, a base B and a lock member L1 described later, The front shaft F can be moved relative to the seat 3.

  In this embodiment, the plurality of components have a long hole N in the vertical direction, and a base B as a first component that holds the front shaft F so as to be able to adopt a plurality of connection positions in the long hole N; The front shaft F is provided so as to be able to protrude and retract with respect to the inside of the long hole N so that the front shaft F does not move from the specific connecting position in the protruding state, and the front shaft F moves along the long hole N in the recessed state. This is a lock member L1 as a second part that makes it possible.

  The chair C in this embodiment is such that the seat 3 follows and moves backward when the backrest 5 tilts backward by the action of the synchro-rocking mechanism R, and the front shaft F is Thus, the vertical position can be changed, and the support base 2 can be moved back and forth. In other words, the front base of the support base 2 is provided with a long hole 212 that is a slide part facing in the front-rear direction for guiding the front shaft F, and the front of the seat 3 is provided with the front shaft F. A vertical position changing unit for changing the relative position in the vertical direction with respect to the support base 2 is provided. The vertical position changing portion is mainly configured by a long hole N provided in the base B and a lock member L1 held in the base B and capable of projecting and retracting with respect to the long hole N.

  More specifically, the seat forward tilting means G acts on the front shaft F connecting the seat 3 and the support base 2 to change the distance between the seat 3 and the support base 2 to lock the seat 3. The locking mechanism L is provided, and the front shaft F serves to connect the seat 3 and the support base 2 and to change the distance between the seat 3 and the support base 2 to lock. .

  That is, the seat forward tilting means G has a base B which is attached to the outer shell 31 of the seat 3 and moves up and down with respect to the front shaft F, and a desired position of the front shaft F with respect to the base B provided on the base B. The lock mechanism L that locks in position and the biasing element E that elastically biases the base B upward with respect to the support base 2 are provided.

  The base B is provided with a long hole N as a vertical guide portion having a space for guiding the front shaft F so as to be movable up and down. Specifically, the base B has a top wall B11, a front wall B12, a rear wall B13, and left and right block-like side walls B14 that form a multiple wall structure, which are arranged on the front end of the support base 2. Base body B1, mounting flanges B15, B16 provided on front wall B12 and rear wall B13 of base body B1, and bosses B151, B161 for inserting bolts v4, and left and right of front wall B12 in base body B1 A first link pivot B17 provided at one end in the direction, a second link pivot B18 disposed at the other left and right end of the front wall B12, and a central portion of the front wall B12. And a pivot-equipped shaft guide B19 provided on the link. The left and right side walls B14 are formed with the elongated holes and recessed portions B141 for accommodating lock members that communicate with the central portion in the vertical direction of the elongated holes N.

  The locking mechanism L enters the space formed by the front shaft F and the concave portion B141 of the base B and is formed by the long hole N, and locks the locking mechanism L to restrict the vertical movement of the front shaft F ( v) and the lock member L1 operable from the space to the lock release position (w) allowing the vertical movement of the front shaft F, and an operation applied to the lock member L1 from the outside. And a drive mechanism L2 that operates between the lock position (V) and the lock release position (W).

  The lock mechanism L in this embodiment includes a pair of lock members L1 that directly engage with the left and right sides of the front shaft F, and the drive mechanism L2 is connected to an operation lever L23 that is a single operation unit. The lock member L1 arranged in a pair on the left and right is interlocked by the applied operating force. The lock member L1 has a block shape having an L shape in side view.

  The drive mechanism L2 has a base end portion pivotally supported on one side portion on the front side of the base B, that is, the first link pivot portion B17, and a distal end portion located on the other side portion on the front side of the base B. The base end portion is pivotally supported by the first link member L21 and the left and right other side portions on the front side of the base B, that is, the second link pivoting portion B18, and the distal end portion is one side portion of the base B. A second link member L22 positioned at the center, and a pivot attachment member L24 that pivotally attaches an intermediate portion of the second link member L22 to an intermediate portion of the first link member L21. The drive mechanism L2 connects one lock member L1 to the tip of the first link member L21 via a connection pin p1 and the other to the tip of the second link member L22 via a connection pin p1. The locking member L1 is connected. The intermediate portion in the vertical direction of the pin p1 is disposed so as to be movable back and forth in a communication path B142 extending in the vertical direction that connects the lower surface side of the side wall B14 of the base B and the recessed portion B141. The pivot member L24 is guided by a link pivot shaft guide B19 of the base B so as to be movable back and forth.

  An operating lever L23 is integrally provided at the tip of the first link member L21. By operating the operating lever L23 and rotating the first link member L21, the first link member L21 is provided. One lock member L1 connected to L21 moves forward and backward between the lock position (v) and the lock release position (w). Further, since the movement of the first link member L21 is transmitted to the central portion of the second link member L22 via the pivot attachment member L24, the other lock member L1 connected to the second link member L22 is also the above-mentioned. In synchronism with one lock member L1, it can operate between the lock position (v) and the lock release position (w).

  The biasing element E includes a first spring mount E1 rotatably attached to a central portion of the front shaft F, a second spring mount E2 rotatably engaged with a front wall B12 of the base B, A compression coil spring E3 as an urging member interposed between the spring mounts E1 and E2 is provided, and the front portion of the seat 3 is used as a base with the front shaft F supported by the support base 2 as a scaffold. It is elastically biased upward via B.

  A part of the seat forward tilting means G as described above is configured to be integrally handled as the seat forward tilt adjusting unit U.

  The seat front tilt adjustment unit U is interposed between the support base 2 and the seat 3 and adjusts the degree of tilt of the seat 3 with respect to the support base 2. The seat front tilt adjustment unit U is assembled to the base B so that it can be handled integrally. The base B is attached to the seat 3, and the front shaft F is attached to the support base 2. The distance is supported to be changeable.

  More specifically, the seat front tilt adjustment unit U is configured to support the base B and the support base 2 of the base B from the lock position (v) that is held by the base B and restricts the movement of the base B relative to the support base 2. The lock member L1 that is movable between the lock release position (w) that allows movement relative to the lock position L and the operation that is held by the base B and that can be applied from the outside to the lock position L (v). The drive mechanism L2 that is operated until the lock release position (w) is provided.

  The rotation center of the rear portion of the seat 3 is a rear shaft 235 that connects the seat 3 and the support base 2 on the rear side. By using the rear shaft 235 as the center of rotation of the seat 3, the distance between the backrest point and the seat 3 is difficult to change. For this reason, even if the seat 3 takes the forward leaning posture (B), adverse effects on the sitting comfort for the seated person are suppressed. Further, the rear shaft 235, which is an essential component of the chair C that can be tilted backward, is used as the center of rotation of the rear portion of the seat 3. For this reason, in the chair C that can be rocked backward, the seat 3 can be tilted relatively easily by simply attaching and detaching the seat 3 and the seat front tilt adjustment unit U arranged on the front side of the support base 2. It is possible to select whether or not.

<Back frame 4>
The back frame 4 includes left and right back support rods 41 whose base end portions are supported by the support base portion 2, and a connection member 42 that connects the tip portions of the left and right back support rods 41. The left and right back support rods 41 are opened to the inside, and are integrally formed of, for example, aluminum die cast or reinforced plastic. The back support rod 41 includes a back support rod main body 411 having an L-shape when viewed from the side, and left and right back support attachment portions 412 that are integrally provided at the distal ends of the respective back support rod main bodies 411 and extend outward while gradually rising. And left and right connecting portions 413 that are integrally provided at the distal ends of the respective back support rod main bodies 411 and extend inward. The left and right connecting portions 413 are connected to each other by the connecting member 42. .

  A base end portion of each back support rod main body 411 has a boss portion 414 fitted to the end portion of the main shaft 22 and is fixed to the attachment portion 232 of the synchro frame 23 near the base end portion using a bolt v1. The intermediate rib 415 is provided. The left and right back support rod main bodies 411 are fixed to the support base 2 by fixing the intermediate rib 415 to the mounting portion 232 of the synchro frame 23 with the bolt v1 in a state where the boss portion 414 is fitted to the main shaft 22. It is attached to be able to rotate.

  The backrest mounting portion 412 located on the distal end side of the back support rod main body 411 has a shape along the lower edge of the lower frame 51b in the backrest 5, and a joining end surface 412a facing upward at the peripheral edge portion on the upper surface thereof. And a convex portion 412b for mounting the backrest 5 protruding upward is provided on the inner portion surrounded by the joining end surface 412a. Further, the left and right backrest mounting portions 412 are provided with bolt insertion holes 412c through which the bolts v2 for fixing the backrest 5 are inserted.

  The connection portion 413 located on the distal end side of the back support rod main body 411 is formed continuously with the backrest mounting portion 412, and the left and right connection portions 413 are positioned at the center in the left-right direction of the chair C. Is faced. In other words, the back frame 4 has a right back support rod 41 arranged on the right side of the support base 2 and a left back support rod 41 arranged on the left side in the left-right direction at the rotating end portion located on the rear end side. The left and right back support rods 41 are joined together in the assembled state. The left and right connecting portions 413 are formed with recessed portions 413a that are open to the butted end surfaces and the front surface, and metal connecting members 42 are accommodated in the recessed portions 413a. Screw holes 421 are formed at both ends of the connection member 42, and bolt insertion holes (not shown) are formed at portions of the connection portions 413 corresponding to the screw holes. The left and right back support rods 41 are integrally connected by screwing the connecting bolt v3 inserted through the bolt insertion hole into the screw hole 421 of the connection member 42. A bearing bracket 43 is integrally provided at the center in the left-right direction on the front edge side of the connecting member 42, and the tip end portion of the gas spring 44 is rotatably connected to the bearing bracket 43. That is, the gas spring 44 is for applying a standing force to the back frame 4, and its front end is pivotally attached to the support base 2 and its rear end is pivotally attached to the back frame 4. The gas spring 44 also plays a role for locking the backrest 5 at a desired rearward tilt position by lever operation.

<Backrest 5>
The backrest 5 includes a frame-like back support member 51 called a so-called back frame, a mesh-like tension member 52 that is stretched on the back support member 51 and receives a load of a seated person, and the back support member 51. The backrest 5 is attached to the back frame 4.

  The back support member 51 is integrally formed of a synthetic resin. The back support member 51 is a left and right side frame 51a, a lower frame 51b that joins the lower ends of the side frame 51a, and an upper portion that joins the upper ends of the side frames 51a. And a frame 51c.

  Each of the side frames 51a has a bent portion 510 in which a portion corresponding to the waist portion of the seated person is protruded most forward, and has a dogleg shape in a side view. The bent portion 510 is provided with mounting recesses Q1 and Q2 for mounting the lumbar support m.

  One mounting recess, that is, the mounting recess Q1 on the right side when viewed from the front, is formed between the inner wall Q11 and the outer wall Q12 and is opened forward, and has a hollow shape at the center in the vertical direction of the back wall Q13. The axis Q14 protrudes forward. A plurality of cutouts Q111 for allowing a band-like body m1 as a pressure receiving body of a lumbar support m, which will be described later, to pass through are formed at a front edge of the inner wall Q11 at predetermined intervals in the vertical direction.

  The other mounting recess, that is, the mounting recess Q2 on the left side when viewed from the front, is formed between the inner wall Q21 and the outer wall Q22 and is opened forward, and a bearing Q24 is formed at the center in the vertical direction of the rear wall Q23. Has been. At the front edge of the inner wall Q24, a plurality of cutouts Q211 are formed at predetermined intervals in the vertical direction for allowing a belt-like body m1 as a pressure receiving body of the lumbar support m described later to pass therethrough.

  The lower frame 51b has a joining end surface 511 facing the joining end surface 412a of the back frame 4 at a peripheral portion on the lower surface thereof, and a recess 512 in an inner portion surrounded by the joining end surface 511. The left and right ends of the lower frame 51b are formed with nut holders 513 that are opened to the front and recessed, and the nuts 514 are accommodated in the left and right nut holders 513. And the bolt insertion hole 515 corresponding to the nut 514 distribute | arranged in the nut holder 513 is provided in the state connected to the lower surface.

  In this embodiment, the concave portion 512 provided at the lower end of the backrest 5 that is the first member is engaged with the convex portion 412b of the back frame 4 that is the second member, and the backrest 5 The backrest 5 and the back frame 4 are joined together with a space between the first joining end face 511 and the second joining end face 412a provided at the rotating end of the back frame 4. . And the accent member H which has a buffering action which can conceal the base end part of the convex part 412b of the said back frame 4 between the 1st joint end surface 511, 412a, and the 1st joint end surface 511 and the 2nd Are interposed between the joint end surfaces 412a.

  The tension member 52 is a mesh-like member that receives a load of a seated person. Specifically, the tension member 52 is inserted and fixed at the left and right edges into the mounting groove mz of the side frame 51a, the lower edge is inserted and fixed at the mounting groove mz of the lower frame 51b, and the upper edge is fixed. By being inserted and fixed in the mounting groove mz of the upper frame 51c, it is stretched on the back support member 51 having a frame shape.

  The lumbar support device W is mainly composed of left and right side frames 51a of a backrest 5 and lumbar supports m attached to the left and right side frames 51a.

  The lumbar support m is formed integrally with the belt-like body m1 on the left and right side edges of the belt-like body m1 and an elastically deformable pressure receiving body that extends in the left-right direction and bends under the load of the seated person. The left and right side edge bodies m2 and m3 having high rigidity are provided. In addition, the lumbar support device W includes a bending distribution mechanism d for making the bending degree of at least the upper region ur and the lower region sr different from each other when the weight from the seated person acts. A bending adjustment mechanism j for adjusting the overall bending degree of the belt-like body m1.

  The lumbar support m is integrally provided with the belt-like body m1 and the left and right side edge bodies m2 and m3, and in this embodiment is integrally formed with a synthetic resin.

  A plurality of strips m1 that are pressure receivers are arranged at intervals in the vertical direction. In this embodiment, six strips m1 having substantially the same vertical width are arranged at substantially equal intervals in the vertical direction. One end of each band-like body m1 is integrally connected to the inner edge of one side edge body m2, and the other end of each band-like body m1 is connected to the inner edge of the other side edge body m3. Yes.

  One side edge body, that is, the right side edge body m2 positioned on the right side in the front view, has a substantially vertically long rhombus shape extending in the vertical direction, and includes a bearing hole m21 in the central portion in the vertical direction. Specifically, the right side edge body m2 includes a front plate m22 that is continuous with the belt-like body m1, and a raised portion m23 that protrudes from the back surface of the front plate m22 so as to form a rhombus in a rear view. . The raised portion m23 includes an inner vertical rib m24 that is bent so that the vertical center portion is located on the innermost side, an outer vertical rib m25 that is bent so that the vertical center portion is located on the outermost side, and these inner vertical ribs m24. And a plurality of horizontal ribs m26 connecting the outer vertical ribs m25. The bearing hole m21 opened rearward is formed by the vertical center portion of the inner vertical rib m24 and the outer vertical rib m25 constituting the raised portion m23 and the horizontal rib m26 formed near the vertical center. The position of the side surface m241 facing the center direction of the chair C of the inner vertical rib m24 and the position of the inner edge of the front plate m22 are substantially matched in front view. The bending distribution mechanism d is mainly composed of a right side edge m2 and a side frame 51a corresponding to the side edge m2.

  The other side edge body, that is, the left side edge body m3 located on the left side in the front view has a strip shape in front view extending in the vertical direction, and has a wedge shape in the plan view. In other words, the left side edge body m3 is set so that the thickness dimension on the outer edge side is larger than the thickness dimension in the front-rear direction on the inner edge side, and the front surface is substantially flush with the front surface of the belt-like body m1. The back surface m3a is inclined with respect to the front surface. More specifically, the side edge body m3 is continuous with the belt-like body m1 and forms a front face m31 and a plurality of ribs protruding in the vertical direction on the rear side of the front board m31. m32, and a rear surface m3a inclined by the rear end of each rib m32 is formed. The deflection adjusting mechanism j is configured with the left side edge body m3 and the side frame 51a corresponding to the side edge body m3 as constituent elements.

  In the lumbar support m, the strip m1 present in the upper region ur and the strip m1 present in the lower region sr are set slightly longer in the left-right direction than the strip m1 present in the intermediate region cr. Yes.

  The bending distribution mechanism d is a mechanism in which an intermediate portion in the vertical direction of the one side edge body m2 is supported by the corresponding one side frame 51a so as to be rotatable in the left-right direction. That is, one side edge body m2 is accommodated in the mounting recess Q1 of one side frame 51a so that the lumbar support m is installed between the left and right side frames 51a. A shaft Q14 projecting from the mounting recess Q1 is engaged with the bearing hole m21 of the side edge body m2, and the side edge body m2 is rotatably held around the axis of the axis Q14. Has been. Each strip m1 of the lumbar support m is inserted into each notch Q111 provided on the inner wall Q11 of the right mounting recess Q1. The mounting recess Q1 is covered with a lid body Q3, and the lid body Q3 regulates the movement of the side edge body m2 forward. In this way, the bending distribution mechanism d supports one side edge body m2 of the lumbar support m so that the side frame 51a of the backrest 5 can be rotated in the left-right direction. The bending distribution mechanism d causes the side edge body m2 supported by the side frame 51a to perform a balance operation with the axis Q14 as the rotation center in accordance with the load from the seated person acting on the lumbar support m. The degree of bending of the upper region ur and the lower region sr of the lumbar support m can be adjusted.

  The bending adjustment mechanism j is for adjusting the overall bending degree of the belt-like body m1, and is provided in the corresponding side frame 51a on the left side when viewed from the front, and moves the corresponding side edge body m3 in the left-right direction. A restriction member j1 for restriction and a restriction position changing means j2 for changing a restriction position by the restriction member j1 are provided.

  The restricting member j1 is a vertically long bar-shaped member that curves along the shape of the bent portion 510 of the side frame 51a, and the side edge body m3 of the lumbar support m housed in the attachment recess Q2 and the attachment It is arranged between the back wall Q23 of the recess Q2. The regulating member j1 includes a boss j12 that holds a nut j11 at the center in the vertical direction. The front surface j1a of the regulating member j1 is inclined so as to gradually recede from the inner edge toward the outer edge, and the back surface of the side edge body m3 is in contact with the front surface.

  The restricting position changing means j2 is attached to the mounting recess Q2 of the side frame 51a and has a front lid Q4 that prevents the side edge body m3 from moving forward in the lumbar support m disposed in the mounting recess Q2. The screw rod j21 as a screw feeding member supported by a bearing Q24 provided on the back wall Q23 of the mounting recess Q2 and screwed into the nut j11, and the screw provided at the rear extension end of the screw rod j21. An adjustment grip j22 for rotating the rod j21 to advance and retract the regulating member j1 in the front-rear direction is provided. That is, the restriction position changing means j2 forms a tapered space that gradually becomes narrower toward the center side of the chair C by the back surface Q41 of the lid body Q4 and the front surface j1a of the restriction member j1. Is provided with a side edge body m3 of the lumbar support m having a wedge shape in a plan view. Then, the restriction position changing means j2 can restrict the movement of the side edge body m3 inward due to the load of the seated person on the lumbar support m at a predetermined position by the wedge action by the tapered space. It is a thing. That is, the restricting position changing means j2 changes the front / rear position of the restricting member j1 containing the nut j11 by moving the nut j11 screwed to the screw rod j21 back and forth by operating the adjustment grip j22. The restriction position of the side edge body m3 can be changed by changing the front-rear width of the taper space.

<Accent member H>
The accent member H is an annular member integrally made of synthetic resin and is fitted on the base end portion of the convex portion 412b of the back frame 4. The accent member H includes an outer surface H1 that is substantially flush with the outer surface of the back frame 4, that is, the back surface of the backrest mounting portion 412 and the outer surface of the backrest 5, that is, the back surface of the lower frame 51b. Arbitrary coloring can be given to the outer surface of the accent member H, and a sharp image or the like is imparted through vision, and the design of the entire chair C is improved.

  Here, an example of the assembly order related to the accent member H will be outlined as follows. First, in a state where the left and right back support rods 41 are brought into contact with each other, the accent member H is externally fitted to the convex portions 412b of the left and right back support rods 41 to temporarily position the left and right back support rods 41. Next, the back frame 4 is completed by connecting the back support rods 41 with the connecting member 42 in the temporarily positioned state. After that, the convex portion 412b of the back frame 4 and the concave portion 512 of the backrest 5 are engaged with each other, and the bolt v2 inserted through the bolt insertion holes 412c and 515 from below is screwed to the nut 514 of the backrest 5. By doing so, the backrest 5 is fixed to the back frame 4. In this assembled state, the accent member H is clamped and fixed between the joint end surface 412a of the back frame 4 and the joint end surface 511 of the backrest 5, and the outer surface H1, the back frame 4 and the back surface of the backrest 5 are fixed. And are designed to be continuous. In such an assembled state, the accent member H is disposed through the joint portion 413c between the left back support rod 41 and the right back support rod 41, and the left and right back support rods 41 are arranged. Are concealed so as not to be seen from the outside.

  In addition, inclined surfaces H21 and H31 in which the inner edge side protrudes from the outer edge side are provided on part of the upper surface H2 and the lower surface H3 of the accent member H, and the backrest 5 that abuts on the upper surface H2 and the lower surface H3. And the corresponding inclination is formed in the joining end surface of the back frame 4. That is, when the backrest 5 is fastened to the back frame 4 by the bolt v2, the accent member H is positioned and fixed at an intended position by the taper action of the inclined surfaces H21, H31 and the joining end surfaces 511, 412a. It is made to do.

  The backrest 5 and the seat 3 configured as described above are tilted at a constant ratio by the synchro-rocking mechanism R.

<Synchloroocking mechanism R>
The synchro-rocking mechanism R supports the front shaft F held on the base B to the support base 2 so as to be movable back and forth, and the rear shaft 235 held on the synchro frame 23 to the outer shell 31 of the seat 3. The back tilting action of the backrest 5 and the sinking action of the seat 3 are linked to each other. That is, the synchro-rocking mechanism R connects the seat 3 to the front end portion of the support base 2 via the front shaft F so as to be movable back and forth, and the rear end side of the seat 3 to the support base 2 via the rear shaft 235. It is what was supported. Specifically, the front shaft F is slidably supported by a long hole 212 extending in the front-rear direction provided at the front end of the support base 2. The rear shaft 235 also serves as a rotation fulcrum of the seat forward tilting means G, and is supported by the bearing portion 234 of the synchro frame 23. The sync frame 23 of the support base 2 is configured to be rotatable with respect to the housing 21, and the rear shaft 235 held by the sync frame 23 can operate integrally with the back frame 4 that supports the backrest 5. It is like that.

<Armrest 6>
The armrest 6 is attached to a seat 3 that can be tilted between a standard position (A) and a forward tilt position (B) by the action of the seat forward tilting means G. The armrest 6 includes an elbow rest 62 having the elbow rest surface 62m on the upper surface, and the elbow rest surface 62m includes a first elbow rest surface portion 62m1 and a second elbow rest surface portion 62m2. ing. When the seat 3 is in the solid line of FIG. 2 and the standard position (A) shown in FIG. 9, the first elbow rest surface portion 62m1 is closer to the horizontal than the second elbow rest surface portion 62m2, When the seat 3 is in the forward tilt position (B) shown in FIG. 10, the second elbow rest surface portion 62m2 is made to be closer to the horizontal than the first elbow rest surface portion 62m1. The elbow rest surface 62m is formed by arranging the second elbow rest surface portion 62m2 after the first elbow rest surface portion 62m1. 9 and 10, the line indicated by the solid line 62ma is the upper surface reference line corresponding to the center position in the front-rear direction of the first elbow rest surface 62m1, and the line indicated by the alternate long and short dash line 62mb is the second arm rest surface portion It is an upper surface reference line corresponding to the center position in the front-rear direction of 62 m2. In FIG. 10, a line indicated by a broken line sh is a horizontal line.

  Specifically, the armrest 6 is obtained by holding an armrest body 6a on an elbow frame 6b attached to the seat 3 so that the vertical position can be changed.

  The elbow frame 6b includes a mounting arm 64 whose base end portion is attached to the lower surface of the outer shell 31 using screws v5, and a cylindrical portion 63 whose intermediate position (c) is held at the distal end portion of the mounting arm 64. Is an integrally formed product. The tubular portion 63 accommodates a lifting position adjusting mechanism (not shown) for changing the lifting position of the armrest body 6a by operating a lifting operation button 613 disposed on the elbow post 61. Therefore, the description is omitted.

  The armrest main body 6 a includes an elbow post 61 held by the tubular portion 63 and an elbow rest 62 attached to the upper end of the elbow post 61. In between, the elbow rest 62 is guided to move forward and backward through the intermediate position (c) between the most advanced position (f) and the last retracted position (r), and in the vicinity of the intermediate position (c). An elbow rest guide mechanism 66 for turning the elbow rest 62 in conjunction with the advance / retreat operation is provided.

  The elbow strut 61 includes an elbow strut body 611 held by the tubular portion 63 and an elbow rest support 612 provided at the upper end of the elbow strut body 611. The elbow rest support portion 612 is configured such that the elbow rest guide mechanism 66 is attached to the upper surface thereof, and includes an indented portion 612a opened forward and inward.

  The elbow rest 62 includes an elbow support member 621 and an elbow pad 622 mainly composed of a cushion member provided on the elbow support member 621.

  The elbow support member 621 includes a bottom wall 621a reinforced by a rib that supports the elbow pad 622 from below, and a peripheral portion on the lower surface side of the elbow pad 622 that protrudes upward from the periphery of the bottom wall 621a. And a peripheral edge portion 621b for holding the. The peripheral edge portion 621b is raised from the edge portion of the bottom wall 621a, and has a shape for making the vertical width of the elbow pad 622 visible from the outside substantially constant.

  As shown in FIGS. 9 and 10, the elbow pad 622 has a thickness dimension w1 corresponding to the first elbow rest surface portion 62m1 greater than a thickness dimension w2 corresponding to the second elbow rest surface portion 62m2. It is set thick. Therefore, the protruding dimension of the part corresponding to the first elbow rest surface part 62m1 of the peripheral edge 621b is set larger than the projecting dimension of the part corresponding to the second elbow rest surface part 62m2.

  That is, the elbow support member 621 is provided with a bottom wall 621a in which a substantially horizontal upper surface portion is formed by a plurality of ribs 621f, and protruding from the peripheral edge of the bottom wall 621a so as to be positioned above the upper surface portion. The peripheral part 621b is provided, and the front part of the bottom wall 621a is formed deeper than the rear part.

  The elbow rest guide mechanism 66 guides the elbow rest 62 so as to move forward and backward through the intermediate position (c) between the most advanced position (f) and the last retracted position (r), and the intermediate position (c). In the vicinity, the elbow rest 62 is pivoted in conjunction with the advance / retreat operation, and the elbow rest 62 has a forward posture in which the elbow rest 62 faces in the front-rear direction at the most advanced position (f) and the last retracted position (r). And an inward posture in which the position of the front end is located on the innermost side at the intermediate position (c).

  More specifically, the elbow rest guide mechanism 66 includes a stepped bolt 661 which is a first connecting portion provided in the elbow rest supporting portion 612 and a stepped bolt 661 provided in the elbow receiving member 621 in the front-rear direction. Rail 665 slidably guided on, a stepped bolt 663 serving as a second connecting portion provided on the elbow receiving member 621, and a pivot end provided on the elbow rest supporting portion 612 so as to be horizontally rotatable. A link member 664 pivotally attached to a stepped bolt 663 serving as a second connecting portion is provided.

  More specifically, the stepped bolt 611 as the first connecting portion is screwed to the nut portion 612 of the elbow rest support portion 612. The rail 665 has a slit shape extending in the front-rear direction, and is formed in the bottom wall 621a of the elbow support member 621. The stepped bolt 661 has a shaft shape guided by the slit-shaped rail 665 and has a screw portion 661a screwed to the nut portion 612b of the elbow rest support portion 612 at the lower end side and the upper end side. And a head 661b. A slide plate 662 located on the upper surface side of the bottom wall 621a is attached to the stepped bolt 661.

  The stepped bolt 663 as the second connecting portion is screwed into the nut portion 621e of the elbow receiving member 621 from below. The stepped bolt 663 has a shaft shape penetrating the distal end portion of the link member 664. The stepped bolt 663 has a screw portion 663a screwed to the nut portion 621e of the elbow receiving member 621 on the upper end side and the lower end side. Is provided with a head 663b. The link member 664 has a base end portion supported by an elbow rest support portion 612 via a shaft 667, and a base end side portion is accommodated in a recessed portion 612 a in the elbow rest support portion 612. A shaft insertion hole 664a is formed at the distal end of the link member 664, and a stepped bolt 663 serving as a second connecting portion passes through the shaft insertion hole 664a.

  The stepped bolt 663 serving as the second connecting portion is disposed in the middle of the elbow receiving member 621 in the front-rear direction, and the rail 665 is disposed outside the stepped bolt 663. The stepped bolt 661 serving as the first connecting portion is locked to the rear end of the rail 665 when the elbow rest 62 is in the most advanced position (f), and the elbow rest 62 moves to the last retracted position (r). In this case, the rail 665 moves to the front end and is locked. In this way, when the elbow rest 62 moves from the most advanced position (f) to the last retracted position (r), the link member 664 has its tip directed inward from the forward position (x) to the rearward position (z). It is designed to rotate via the inward position (y). Therefore, the elbow rest guide mechanism 66 guides the elbow rest 62 so that it moves forward and backward through the intermediate position (c) between the most advanced position (f) and the last retracted position (r). (C) In the vicinity, the elbow rest 62 can be turned in conjunction with the advance / retreat operation.

  As described above, the chair C according to this embodiment includes the seat 3 that can tilt at least from the standard position (A) to the forward tilt position (B), and the seat 3 has the elbow rest surface 62m. An armrest 6 is provided. The elbow rest surface 62m includes a first elbow rest surface portion 62m1 and a second elbow rest surface portion 62m2, and when the seat 3 is in the standard position (A), When the elbow rest surface portion 62m1 is closer to the horizontal than the second elbow rest surface portion 62m2 and the seat 3 is in the forward tilt position (B), the second elbow rest surface portion 62m2 is the first elbow rest surface portion. It is configured to be closer to the horizontal than 62m1. For this reason, what has the armrest surface 62m which can contribute to a comfortable use can be provided also to the seated person who is seated in the seat 3 in the forward tilt position.

  In other words, even when the seated person is seated on the seat 3 in the forward tilt position (B), the seat or the body portion tries to hold the head or the torso part in an upright position substantially perpendicular to the floor surface depending on the situation. There is a case. Correspondingly, the chair C of the present embodiment provides a comfortable use of the elbow rest 62 by the second elbow rest surface 62m2 that is close to the horizontal even for a seated person in such a standing posture. It is possible to do.

  The elbow rest surface 62m is configured such that the second elbow rest surface portion 62m2 is continuously arranged after the first elbow rest surface portion 62m1. For this reason, both when the seat 3 is in the standard position (A) and when the seat 3 is in the forward tilt position (B), the first and second elbow rest surfaces 62m1 and 62m2 are arranged at suitable positions. It has become. That is, for example, when the seat 3 transitions to the forward tilt position (B), the second elbow rest surface 62m2 that is nearly horizontal transitions from the rear to the front in conjunction with the forward tilt of the seat 3. Therefore, the second elbow rest surface 62m2 can be set to a position suitable for a seated person sitting on the seat 3 in the forward tilt position (B).

  Moreover, the chair C shown in this embodiment not only configures the seat 3 to be able to tilt forward, but also synchronizes the backrest 5 and the seat 3 at a certain ratio by the action of the synchro-rocking mechanism R. Can be tilted backward. For this reason, the seated person leaning on the backrest 5 that tilts backward more greatly than the seat 3 is arranged at the rear part rather than the first elbow rest surface 62m1 and is a face inclined backward from the first elbow rest surface 62m1. The second elbow rest surface 62m2 is easily placed around the elbow.

  The armrest 6 includes an elbow rest 62 having the elbow rest surface 62m on the upper surface, and the elbow rest 62 mainly includes an elbow rest member 621 and a cushion member provided on the elbow rest member 621. Elbow pad 622. In the elbow pad 622, the thickness dimension w1 of the portion corresponding to the first elbow rest surface portion 62m1 is set to be thicker than the thickness dimension w2 of the portion corresponding to the second elbow rest surface portion 62m2. For this reason, the cushioning property of the front part in the elbow rest 62 can be improved more than the rear part, and it can contribute to a seated person's comfort.

  The armrest 6 includes an elbow rest 62 having the elbow rest surface 62m on an upper surface, and the elbow rest 62 includes an elbow rest member 621 and an elbow pad 622 provided on the elbow rest member 621. The elbow receiving member 621 includes a peripheral portion 621b for making the region visible from the outside on the peripheral surface of the elbow pad 622 substantially constant. For this reason, the elbow pad 622 that is set to be thicker than the rear part of the elbow rest 62 can be suitably supported. In addition, since the vertical dimension in the side view of the elbow pad 622 is visually recognized from the outside, a suitable impression can be given to the viewer.

  Since the armrest 6 includes an elbow support 61 supported by the seat 3 and the elbow rest 62 provided on the elbow support 61 so that the position of the armrest 6 can be changed in the front-rear direction. Therefore, it is possible to provide a suitable elbow rest 62 that can be adapted to various working postures.

  The armrest 6 includes an elbow frame 6b attached to the seat 3, an elbow post 61 held on the elbow frame 6b, and the elbow rest 62 provided on the elbow post 61. The elbow frame 6b includes a cylindrical portion 63 that holds the elbow post 61, and a mounting arm 64 that is connected to an intermediate position in the vertical direction of the cylindrical portion 63 and has a base end attached to the seat. It is. For this reason, the up-down direction intermediate position in the cylindrical part 63 makes the aspect connected to the attachment arm 64, and can provide the elbow frame 6b excellent in intensity | strength.

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

  The armrest is not necessarily limited to that provided on the seat, and may be attached to a member that tilts together with the seat.

  In the above-described embodiment, the elbow rest surface has been described as including the first and second elbow rest surface portions, but other than these first and second elbow rest surface portions, other functionalities different from each other. An elbow rest surface portion may be provided.

  The elbow pad may be any one as long as it is mainly composed of a cushion member, and various types can be considered.

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

3 ... Seat 6 ... Armrest 62 ... Elbow rest 62m ... Elbow rest surface 62m1 ... First elbow rest surface portion 62m2 ... Second elbow rest surface portion 621 ... Elbow support member 621b ... Peripheral portion 622 ... Elbow pad (A) ... Standard position (B) ... Forward tilt position w1 ... Thickness dimension w2 ... Thickness dimension

Claims (5)

A chair provided with an armrest having an armrest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat,
The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. It becomes closer to the horizontal than the contact surface, and when the seat is in a forward tilt position, the second elbow contact surface is closer to the horizontal than the first elbow contact surface ,
The armrest includes an armrest having the armrest surface on an upper surface,
The elbow rest includes an elbow support member and an elbow pad mainly composed of a cushion member provided on the elbow support member;
The chair in which the elbow pad sets a thickness dimension of a part corresponding to the first elbow pad surface part to be larger than a thickness dimension of a part corresponding to the second elbow pad surface part . A chair provided with an armrest having an armrest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat,
The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. It becomes closer to the horizontal than the contact surface, and when the seat is in a forward tilt position, the second elbow contact surface is closer to the horizontal than the first elbow contact surface,
The armrest includes an armrest having the armrest surface on an upper surface,
The elbow rest includes an elbow support member and an elbow pad provided on the elbow support member;
The chair provided with the peripheral part for the said elbow receiving member to make the area | region visually recognizable from the outside in the surrounding surface of the said elbow pad substantially constant . A chair provided with an armrest having an armrest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat,
The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. It becomes closer to the horizontal than the contact surface, and when the seat is in a forward tilt position, the second elbow contact surface is closer to the horizontal than the first elbow contact surface,
A chair provided with an elbow strut supported by the armrest or a member tilting forward together with the seat, and the elbow rest provided on the elbow strut so that the position of the armrest can be changed in the front-rear direction . A chair provided with an armrest having an armrest surface on a seat that can tilt at least from a standard position to a forward tilt position, and a member that tilts together with the seat,
The elbow rest surface includes a first elbow rest surface portion and a second elbow rest surface portion, and the first elbow rest surface portion is the second elbow when the seat is in a standard position. It becomes closer to the horizontal than the contact surface, and when the seat is in a forward tilt position, the second elbow contact surface is closer to the horizontal than the first elbow contact surface,
The armrest includes an elbow frame attached to the seat or a member tilting forward together with the seat, an elbow strut held by the elbow frame, and the elbow rest provided on the elbow strut. Yes,
The elbow frame includes a cylindrical portion that holds the elbow post, and a mounting arm that is connected to an intermediate position in the vertical direction of the cylindrical portion and has a base end attached to the seat or a member that tilts forward together with the seat. A chair that is a thing . The chair according to claim 1 , 2, 3, or 4 , wherein the elbow rest surface is formed by continuously arranging the second elbow rest surface portion after the first elbow rest surface portion.

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