JP6326769B2 - Chair - Google Patents

Description

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

  2. Description of the Related Art Conventionally, a chair is known in which an attachment portion of an optional member such as a hanger or a headrest is detachably attached to a portion that constitutes a backrest (see, for example, Patent Document 1).

  However, most of the chairs of this type are designed to be attached to the backrest depending on the structure of the attachment portion on the option member side.

  In addition, since the backrest in the conventional chair configured to be able to attach the option member was formed with protrusions and holes used exclusively for attachment of the option member, the option member is not attached In this case, protrusions and holes are exposed to the outside, which is a factor that impairs the overall aesthetics. If necessary, a concealing cover is additionally required. .

JP 2004-351118 A

  The present invention has been made paying attention to the above circumstances, and in a chair having an optional member detachably attached thereto, it is possible to provide a beautiful appearance for a viewer and to contribute effectively to the mounting of the optional member. The goal is to provide a chair with drowning.

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

The chair according to claim 1 is a chair in which an attachment portion of an optional member can be attached to and detached from an upper frame of a back support member that fastens a tension member, and the upper frame includes left and right side frames of the back support member. The upper frame is provided with a pair of positioning surfaces for determining the mounting position of the mounting portion, and a distance between the pair of positioning surfaces is determined in the horizontal direction of the upper frame. The pair of positioning surfaces is set such that the mounting portion is gradually shortened from the center to the left and right, and the mounting portion is positioned in the left-right direction in close contact with the positioning surface. but the front of the inner surface of upwardly formed groove in the longitudinal direction of the upper frame, which is constituted by a rear and a flat surface forming an outer surface of the upper frame, the groove, viewed The front inner surface arranged in a V-shape projecting toward the seated person side, and the rear inner surface forming a flat surface facing the front inner surface, the front side distance between the inner surface inner surface of the said rear side, it is configured to become gradually shorter with distance from the center to the left and right by the left-right direction center of the upper frame to the boundary.

  Here, the “optional member” mainly includes a hanger for hanging clothes and a headrest for supporting the head of a seated person.

  As described above, according to the present invention, it is possible to provide a chair having a backrest that can favorably provide an aesthetic appearance to the viewer and can contribute effectively to the mounting of the optional member.

The perspective view seen from the front side of the chair concerning one embodiment of the present invention. The right view of the chair which concerns on the same embodiment. The rear view of the chair which concerns on the embodiment. The top view of the chair which concerns on the same embodiment. The disassembled perspective view which abbreviate | omitted the tension member of the chair concerning the embodiment. The disassembled perspective view which shows the principal part of the chair which concerns on the same embodiment. The disassembled perspective view which shows the principal part of the chair which concerns on the same embodiment. AA line sectional view of Drawing 4. BB sectional drawing of FIG. Action explanatory drawing shown in the BB sectional view of FIG. Action | operation explanatory drawing which shows the slide guide mechanism of the embodiment typically. Action | operation explanatory drawing which shows the slide guide mechanism of the embodiment typically. The disassembled perspective view which shows the principal part of the chair which concerns on the same embodiment. The front view which decomposes | disassembles and shows the principal part of the chair which concerns on the same embodiment. The rear view which expands and shows the principal part of the chair which concerns on the same embodiment. The CC sectional view taken on the line of FIG. The DD sectional view taken on the line of FIG. EE sectional view taken on the line of FIG. F arrow line view of FIG. FIG. 4 is a cross-sectional view taken along the line GG in which the hanger and the headrest in FIG. The disassembled perspective view which shows the principal part of the chair which concerns on the same embodiment. HH sectional view taken on the line of FIG. Action explanatory drawing shown in the HH sectional view of FIG. The perspective view which abbreviate | omits and shows the principal part of the lumbar support apparatus which concerns on the same embodiment. The front view which abbreviate | omits and shows the principal part of the lumbar support apparatus which concerns on the same embodiment. The right view which shows the principal part of the armrest which concerns on the same embodiment. The rear view which shows the principal part of the armrest which concerns on the same embodiment. FIG. 4 is a cross-sectional view taken along line GG in which the headrest of FIG. 3 is omitted. FIG. 4 is a cross-sectional view taken along the line I-I in which the hanger in FIG. 3 is omitted. The disassembled perspective view for demonstrating attachment of the hanger which concerns on the embodiment. The disassembled perspective view for demonstrating attachment of the headrest which concerns on the same embodiment. The perspective view which shows typically the back support member which is other embodiment. The perspective view which shows typically the back support member which is other embodiment. The perspective view which shows typically the back support member which is other embodiment. The perspective view which shows typically the back support member which is other embodiment. The front view which shows typically the back support member which is other embodiment. The front view which shows typically the back support member which is other embodiment. The top view which shows typically the upper frame of the back support member which is other embodiment.

  Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair C will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the chair C is a chair body C <b> 1 with an armrest 7, a hanger X that is an optional member, and a headrest Y that is an optional member.

  The chair body C1 includes a leg 1, a support base 2 supported on an upper portion of the leg 1 and capable of horizontal turning, a seat 4 supported on the support base 2 via a seat frame 3, and the support base. 2 is provided with a backrest 6 supported through a back frame 5 so as to be able to tilt backward.

<Legs>
As shown in FIGS. 1 to 5, the leg body 1 includes a leg blade type leg base 11 having casters 13, and a leg column 12 erected at the center of the leg base 11. . The leg strut 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 strut 12.

<Support base>
As shown in FIGS. 2, 5, 6, 8 to 10 and 13, the support base 2 is supported by the legs 1 so as to be horizontally turnable and vertically movable. A housing 21 mounted on the leg column 12, a backrest supporting main shaft 22 penetrating through both side walls 211 of the housing 21, and a first rotating end 231 provided to be rotatable around the main shaft 22. The bracket 23 having the reaction force receiving shaft 232 and the mounting portion 235 for attaching the back frame to the second rotating end 233, and the reaction force receiving shaft 232 of the bracket 23 to urge the backrest. 6 and a tilt reaction force generation mechanism 24 that generates an elastic reaction force with respect to the backward tilt operation.

  A long hole 212 is formed in the front end portion of both side walls 211 of the housing 21 to support a front connecting member 47 described later so as to be slidable in the front-rear direction.

  The bracket 23 includes a pair of plate-like bracket bodies 234 provided on both sides of the housing 21 and the reaction force receiving shaft 232 connecting the first rotating ends 231 of the left and right bracket bodies 234. And the mounting portion 235 provided to extend outward from the second rotation end 233 of each bracket main body 234. A screw hole 236 is formed in the mounting portion 235, and a back support rod 51 of the back frame 5 described later is fixed to the bracket 23 by a bolt (not shown) screwed into the screw hole 236.

  The tilt reaction force generation mechanism 24 is configured to apply an elastic repulsion force to the reaction force receiving shaft 232 using a coil spring 241, but is not described in detail because it is a normal one. To do.

<Seat frame>
As shown in FIGS. 2 and 5 to 14, the seat frame 3 includes a seat frame main body 31 that holds a rear connection member 46, which will be described later, at the rear end portion 33 and supports the entire seat 4, and A seat front tilt guide 32 is provided at the front end portion 34 of the main body 31 and holds a front connecting member 47 described later so as to be movable up and down.

  The seat frame body 31 is integrally formed of a synthetic resin and has a frame shape having left and right side frame portions 35. The rear end portion 33 of the side frame portion 35 of the seat frame main body 31 includes a bearing portion 351 that holds the rear connecting member 46. The front end portion 34 of the side frame portion 35 of the seat frame main body 31 includes an attachment portion 352 for attaching the seat front tilt guide 32. A gas spring mounting portion 353 is provided inside the intermediate portion of the both side frame portions 35.

  The seat forward tilting guide 32 includes a guide main body 36 disposed between the side frame portions 35 of the seat frame main body 31, and an attachment piece 37 for fixing the guide main body 36 to the attachment portion 352 of the side frame portion 35. And is integrally formed of a sheet metal material. The guide main body 36 is inserted between the side frame portions 35 of the seat frame main body 31, and has a ceiling wall 361 positioned above the side frame portion 35 of the seat frame main body 31, and the ceiling wall 361. And side walls 363 that hang downward from both side edges. An arm receiving portion 362 is formed at the front edge of the top wall 361 so as to bend downward. The side walls 363 are formed with guide holes 364 that hold the front connecting member 47 so as to be movable in the vertical direction. The attachment piece 37 is a plate-like one extending outward from the both side walls 363, and the attachment piece 37 is attached to the lower surface of the seat frame body 31 with a screw (not shown).

<Za>
As shown in FIGS. 1, 2, 4, 5, and 7 to 12, the seat 4 is provided with an outer shell 41 attached on the seat frame 3 and the outer shell 41. A seat main body 42 having an inner shell 421 is provided. Between the outer shell 41 and the inner shell 421, a slide guide mechanism 43 for sliding the inner shell 421 back and forth with respect to the outer shell 41, and the inner shell 421 moved to a desired sliding position. A slide positioning mechanism 44 is provided for locking.

  The outer shell 41 has a load receiving surface 411 for receiving a load from a seated person on the upper surface side. The load receiving surface 411 is formed around a sitting reference point T set in the second half region, and includes an inclined portion 412 that gradually rises forward from the sitting reference point T to the front side. . By providing the inclined portion 412, the forward displacement of the seated person can be suppressed, and the fit at the time of sitting can be improved.

  The operation grip S1 provided below the outer shell 41 is for reaction force adjustment, and adjusts the spring preload of the tilt reaction force generation mechanism 24 provided in the support base 2. ing. On the lower surface of the outer shell 41, a height adjusting lever S2 for adjusting the height position of the seat 4, a tilt locking lever S3 for locking the backrest 6 at a desired locking position, A push button S4 for locking the slide position for operating the slide guide mechanism 43 is provided. Further, a forward tilting lever S5 for operating a seat forward tilting means 45, which will be described later, is provided at the front edge corner of the outer shell 41.

  The seat body 42 includes an inner shell 421 disposed on the outer shell 41 through a slide guide mechanism 43 so as to be slidable in the front-rear direction, a cushion 422 disposed on the inner shell 421, and the cushion. 422 and a seat skin material 423 that surrounds the lower surface of the peripheral edge 425 of the inner shell 421.

  The inner shell 421 includes a load transmitting portion 424 for supporting a load from a seated person on the load receiving surface 411 at a portion corresponding to the load receiving surface 411. The inner shell 421 has a shell shape including a step portion 426 whose peripheral edge portion 425 becomes higher in the vicinity of the peripheral edge, and is integrally formed of a synthetic resin that can be elastically deformed. The region surrounded by the step portion 426 includes a front half shell portion 427 that can be slidably in contact with the front half region of the outer shell 41 and a rear end shell that can be slidably in close contact with the rear half region of the outer shell 41. The main part is composed of a part 428 and an intermediate shell part 429 that smoothly leads the front edge of the rear end shell part 428 to the rear edge of the front half shell part 427. The intermediate shell portion 429 is provided with the load transmission portion 424.

  The load transmitting portion 424 is formed by forming a plurality of slits 420 extending in the front-rear direction in the intermediate shell portion 429 with a space in the left-right direction. In a no-load state, a space P <b> 1 is formed between the lower surface of the load transmission portion 424 and the load receiving surface 411. The load transmitting portion 424 can be elastically deformed relatively easily in the thickness direction due to the presence of the slit 420. That is, the load transmitting portion 424 is configured to elastically deform downward and contact the load receiving surface 411 of the outer shell 41 when receiving a load from a seated person. In other words, the load from the seated person is finally received by the load receiving surface 411 of the outer shell 41 via the load transmitting portion 424.

  The inner shell 421 is arranged on the outer shell 41 via the slide guide mechanism 43 so as to be slidable in the front-rear direction within a predetermined range. At this time, the seating depth dimension of the seat 4 can be changed without accompanying the interlocking shift of the load receiving surface 411. That is, as schematically shown in FIGS. 11 and 12, the seating depth dimension of the seat 4 can be changed by sliding the inner shell 421 with respect to the outer shell 41. Since 411 is provided in the outer shell 41, it does not move in conjunction with the sliding movement of the inner shell 421.

  The slide guide mechanism 43 is formed at a plurality of locations on the inner shell 421 and extends in the front-rear direction. The slide guide mechanism 43 is slidably inserted in the guide slits 431 and slidably contacts the upper surface of the inner shell 421 at the upper end. A plurality of sliders 432 having retaining heads 433 and a plurality of slider mounting portions 435 provided on the outer shell 41 to fix the lower ends 434 of the sliders 432 are provided. Each of the sliders 432 has a prismatic shape that can slide along the corresponding guide slit 431, and a lower end thereof is attached to the outer shell 41 with a screw (not shown).

  The inner shell 421 that is guided by the slide guide mechanism 43 having the above configuration and slides in the front-rear direction can be positioned and locked at a desired slide position by the slide positioning mechanism 44.

  The slide positioning mechanism 44 includes an operation member 441 that can be moved up and down from a lower lock position to an upper lock release position, and a plurality of positioning units that selectively correspond to the operation member 441 as the inner shell 421 slides. And an engaging portion 443 for use. In the slide positioning mechanism 44, the inner shell 421 is prohibited from sliding while the operation member 441 is lowered to the lower lock position and engaged with the corresponding engagement portion 443, and the operation member 441 is moved to the upper position. The engagement with the engagement portion 443 is released in the state where the lock is raised to the unlocked position, and the sliding movement of the inner shell 421 is allowed. The operation end of the operation member 441 protrudes from the lower surface side of the outer shell 41. By operating the push button S4 of the operation member 441 upward, the main part of the seat 4 including the operation member 441 can be moved with respect to the outer shell 41, and the seating depth dimension of the seat 4 can be changed. It has become.

  The cushion 422 is formed by pasting a nonwoven fabric on the lower surface of molded urethane, for example. More specifically, the cushion 422 is mounted on the upper surface of the inner shell 421 and is wrapped by the seat skin material 423 made of cloth or the like together with the peripheral edge portion 425 of the inner shell 421. .

  The seat 4 described above is supported by the support base 2 via the seat forward tilting means 45.

<Front tilting means>
As shown in FIGS. 5, 6, 9, and 10, the seat forward tilting means 45 is indicated by a solid line in FIG. 9 with the entire seat 4 disposed on the support base 2 as the center. In addition, it is for tilting from a standard posture (A) indicated by a thick two-dot chain line in FIG. 10 to a forward tilt posture (B) indicated by a solid line in FIG. The seat forward tilting means 45 is provided on the seat frame 3 supporting the whole seat 4 and the rear end portion 33 of the seat frame 3, and indirectly pivoted to the support base 2 via the back frame 5. A supported rear connection member 46, a front connection member 47 provided at the front end portion 34 of the seat frame 3 and supported by the front end portion of the support base 2, and a front end portion of the seat frame 3 with respect to the front connection member 47 And a lock mechanism 48 for changing the position 34 in the vertical direction and locking it at a desired position.

  The rear connecting member 46 is a shaft-like member held by a bearing portion 351 provided at the rear end portion 33 of the seat frame 3, and both end portions thereof are pivotally attached to the bearing portion 513 of the back frame 5. .

  The front connecting member 47 is a shaft-like member that is held in a long hole 364 provided in the seat front tilt guide 32 of the seat frame 3 so as to be vertically movable, and can be slid back and forth in the long hole 212 of the support base 2. Is inserted.

  The lock mechanism 48 has one end 491 supported by the seat frame 3, a gas spring 451 capable of changing the position of the other end 454 with respect to the one end 453, and a position change of the other end 454 of the gas spring 451. And a motion conversion unit 452 for converting the position of the front end portion 3 of the third front to the front connection member 47 into a vertical position change.

  The gas spring 451 can be switched between a locked state and a non-lockable state that can be expanded and contracted.

  The motion converting portion 452 has a seat front tilt base 49 attached at one end 491 to the support base 2 via the front connecting member 47 so as to be movable back and forth, and an intermediate fulcrum 401 at the other end 492 of the seat front tilt base 49. And a seat front tilt adjustment arm 40 having one rotation end 402 connected to the seat frame 3 and the other rotation end 404 connected to the gas spring 451.

  The seat forward tilt base 49 is provided with a hanging plate 495 on both left and right edges of a flat plate 493 arranged substantially horizontally, and a bearing portion 496 for holding the front connecting member 47 is formed at the front end of the hanging plate 495. Has been. In addition, standing walls 494 that make a pair are erected on the rear edge of the flat plate 493, and the intermediate fulcrum 401 of the seat front tilt adjustment arm 40 is pivotally attached to the standing walls 494. The lower surface of the flat plate 493 of the seat forward tilt base 49 is supported on the support base 2 so as to be slidable back and forth, and the downward swing of the seat forward tilt base 49 is prohibited. When the seat 4 performs a sinking operation in conjunction with the backward tilting operation of the backrest 6 by the action of the synchro-rocking mechanism R described later, the seat forward tilting base 49 and the front connecting member 47 are moved in the front-rear direction. Configured to move to.

  The seat forward tilt adjustment arm 40 has a width dimension that can be disposed between the upright walls 494, and has an L-shape in side view that bends at the position of the intermediate fulcrum 401 pivotally attached to the upright wall 494. ing. A shaft-like protrusion 403 is provided on one rotation end 402 of the seat front tilt adjustment arm 40. The shaft-like protrusion 403 is pivotally supported by the arm receiving portion 362 of the seat front tilt guide 32 of the seat frame 3 so as to be rotatable. A shaft hole 405 is formed in the other rotation end 404 of the seat front tilt adjustment arm 40. The rotating end 404 is pivotally attached to the other end 492 of the gas spring 451 through a connecting shaft 406 inserted into the shaft hole 405.

  In this embodiment, as described above, all the components of the lock mechanism 48 are assembled into the seat frame 3 to form a unit.

<Back frame>
As shown in FIGS. 2, 3, 5, 9, 10, 13, 13-18, 22 and 23, the back frame 5 has an L-shape in a side view having a rising portion. The left and right dorsal support rods 51 extending horizontally in the front-rear direction, the left and right connecting members 52 attached to the rear ends of the dorsal support rods 51 to form the rising portion, and the left and right dorsal support rods 51 are coupled. And a horizontal member 53. In other words, the back frame 5 that supports the backrest 6 is supported by the support base 2 provided on the leg body 1, and the left and right back support rods 51 extending rearward, and the rear ends of these back support rods 51. The left and right connecting members 52 extending upward are mainly configured, and the connecting members 52 are respectively attached to the upper sides of the left and right back support rods 51, and the lower end portion of the backrest 6 is supported via the connecting members 52. ing.

  Each said back support rod 51 is open | released inside, and is integrally formed by aluminum die-casting. The base end portion of each back support rod 51 has a boss portion 511 fitted to the end portion of the main shaft 22 and is fixed to the attachment portion 235 of the bracket 23 using a bolt (not shown) in the vicinity of the base end portion. An intermediate rib 512 is provided. An intermediate portion of each back support rod 51 includes a bearing portion 513 for pivotally attaching the rear connecting member 46. The tip of each back support rod 51 has a mounting base 514 for screwing the horizontal member 53 and a plate-like connecting member mounting protrusion 515 extending integrally upward. The left and right back support rods 51 can be pivoted to the support base 2 by screwing the intermediate rib 512 to the mounting portion 235 of the bracket 23 with the boss portion 511 fitted to the main shaft 22. It is attached.

  The connecting member 52 has a shape that fits between the left and right side edges of the backrest 6 in a front view. Each of the connecting members 52 is interposed between the backrest 6 and the backrest 51, and is separate from the backrest 51 and the backrest 6, respectively. Each connecting member 52 is integrally provided with facing walls 54 and 55 that form a pair each provided with opposing pressing surfaces 541 and 551. That is, each connecting member 52 includes an upper facing wall 54 that supports the lower edge of the backrest 6, a lower facing wall 55 disposed below the upper facing wall 54, both the facing walls 54, A base end side connecting wall 56 that integrally connects the base end sides of 55, and a back side connecting wall 57 that connects the front edge portions excluding the front end portions of the two facing walls 54, 55; It is molded integrally by die casting.

  On the upper surface of the upper facing wall 54, a backrest mounting projection 542 having a nut portion 545 for mounting the backrest 6 is provided. The upper facing wall 54 has an escape hole 544 for preventing interference with a first mounting bolt B4 for mounting an armrest 7 described later provided on the base end side, and an armrest described later provided on the distal end side. And a nut portion 545 for attaching 7.

  The lower facing wall 55 has a bolt insertion hole 552 corresponding to the first mounting bolt B4 and a bolt insertion hole 553 for inserting the second mounting bolt B5 for screwing into the nut portion 545. Is provided. The lower facing wall 55 is formed with an opening 554 into which the connecting member mounting protrusion 515 can be inserted.

  The proximal-side coupling wall 56 is for rigidly coupling the proximal ends of the upper and lower facing walls 54 and 55, and the left and right back support rods are disposed between the inner side surfaces of the left and right proximal-side coupling walls 56. A space P <b> 2 that is continuous with the space P <b> 3 formed between 51 is formed.

  The back side connecting wall 57 is connected to the connecting member mounting protrusion 515 by a bolt (not shown) inserted from the rear in a state where the connecting member mounting protrusion 515 inserted into the opening 554 of the lower facing wall 55 is overlapped. It is fixed to the connecting member 52. That is, the back side coupling wall 57 is provided with a nut portion 571, and a bolt insertion hole 516 is formed in the connecting member mounting projection 515 so as to coincide with the nut portion 571. . The connecting member 52 is fixed to the back support rod 51 by the bolt screwed to the nut portion 571 through the bolt insertion hole 516.

  The upper and lower facing walls 54, 55 of each connecting member 52 have a free end structure on the front end side, and are configured so that the pressing surfaces 541, 551 can be brought close to each other by utilizing elastic deformation of the members. Yes. A mounting region 58 that is opened rearward is formed by the facing walls 54 and 55 having at least the clamping surfaces 541 and 551 and the back side coupling wall 57. In other words, the attachment region 58 extends in the left-right direction along the lower edge of the backrest 6 on the back surface of the chair body C1 provided with the backrest 6, and the armrest 7 as an optional member is attached to the attachment region 58. I try to install it. That is, the attachment region 58 is formed by recessing a specific portion of the chair body C1, and specifically, is provided on the connecting member 52 that is a rising portion of the back frame 5.

  The horizontal member 53 is for connecting the front ends of the back support rods 51, and both ends thereof are fixed to the mounting bases 514 of the back support rods 51 by bolts B6. Between the horizontal member 53 and the support base 2, a gas spring 50 for backward tilt locking is disposed in the space P3. The gas spring 50 has a function of fixing the rearward tilting operation of the back frame 5 at a desired position in the locked state, and in the unlocked state, the gas spring 50 generates the biasing force of the tilting reaction force generating mechanism 24 by its elastic repulsive force. It has a function to assist.

<Backrest>
As shown in FIGS. 1 to 5, 9, 10, and 13 to 27, the backrest 6 includes a frame-like back support member 61 called a so-called back frame, and a back support member 61. It is provided with a mesh-like tension member 62 that is tensioned and receives the load of a seated person, and a lumbar support device 8 that is provided on the back support member 61, and is attached on the connecting member 52 of the back frame 5. Yes.

  The back support member 61 has a gate shape including at least left and right side frames 64 and an upper frame 66 disposed between upper ends of the side frames 64. Specifically, the back support member 61 is integrally formed of synthetic resin, and includes a left and right side frame 64, a lower frame 65 that joins the lower ends of the side frames 64, and an upper end of the side frame 64. And an upper frame 66 for joining the two.

  Each of the side frames 64 includes side frame bodies 641a and 642a that form the side edges of the backrest 6, and a lumbar support member that is assembled in the side frame bodies 641a and 642a and forms a part of the lumbar support device 8. 81a and 82a.

  The side frame bodies 641a and 642a are arranged integrally with a first frame forming a front frame portion having a first back surface 643 and a rear side of the first frame, and are attached to the first back surface 643. And a second frame forming a rear frame portion having an adjacent second back surface 644. The first back surface 643 and the second back surface 644 are flush with each other in the upper portion 646, but are formed so as to be gradually separated in the front-rear direction from the middle toward the bottom. That is, the second back surface 644 is set so as to be gradually located rearward with respect to the first back surface 643, and the entire side frame bodies 641a and 642a gradually increase in thickness in the front-rear direction from the middle. It has a form that increases. In other words, the front frame portion and the rear frame portion are largely separated in the front-rear direction in the protruding portion corresponding to the vicinity of the waist of the seated person with the center portion protruding most forward, and in the front-rear direction arranged in this portion The front frame part and the rear frame part are connected by the extending wall. Therefore, the side frame main bodies 641a and 642a are configured so that the strength of the portion corresponding to the waist of the seated person can be increased and the lumbar support device 8 can be attached to this portion. More specifically, the side frame main bodies 641a and 642a have a waist part 645 that protrudes most forward slightly below the center part and the two back faces 643 and 644 are most separated from each other, and is inclined upward from the waist part 645 while being inclined rearward. And a lumbar device attachment portion for attaching the lumbar support device 8 to the waist portion 645 having the largest longitudinal dimension, and the lumbar device attachment portion of the waist portion 645 has the lumbar device attachment portion. 8 is provided.

  The waist portions 645 of the side frame bodies 641a and 642a include bottom walls 647b and 648b, left and right side walls 647d and 648d, top walls 647e and 648e, and rear walls 647f and 648f, and are opened forward. Further, lumbar mounting spaces 647a and 648a, which are the lumbar device mounting portions, are formed. The left lumbar mounting space 647a of the left side frame body 641a in the front view has a deeper shape than the right lumbar mounting space 648a of the right side frame body 642a in the front view. Further, a rear surface 647g of the rear wall 647f forming the left lumbar mounting space 647a partially protrudes rearward from the first and second rear surfaces 643 and 644. Bolt insertion holes 647c and 648c corresponding to the nut portion 545 of the connecting member 52 are formed in the bottom walls 647b and 648b of the left and right side frame bodies 641a and 642a, and these bolt insertion holes 647c and 648c are viewed from above through the bolt insertion holes 647c and 648c. The back support member 61 is fastened to the connecting member 52 by bolts B <b> 7 and B <b> 8 screwed to the upper half of the nut portion 545. An attachment groove 649 for accommodating the end edge of the tension member 62 is formed in the vicinity of the front edge of the side frame 64.

  The lower frame 65 is integrated with a central portion 651 located in the center in the left-right direction, and extends obliquely upward while gradually protruding forward from both ends of the central portion 651 and is continuously integrated with the lower inner surface of the side frame 64. The left and right end portions 652 are integrally provided, and the left and right end portions 652 are attached to the left and right connecting members 52. More specifically, the lower frame 65 has a hollow body shape opened downward, and includes a front structural wall 653, a rear structural wall 656 provided on the rear side of the front structural wall 653, and the rear structural wall. And a decorative wall 658 provided on the rear side of 656.

  The front structural wall 653 includes a plurality of bolt insertion holes 654 having counterbore holes through which the head of the bolt B1 can pass on the front end side. Then, the back support member 61 is fixed to the connecting member 52 by screwing the bolt B1 inserted from the front side into the bolt insertion holes 654 into the nut portion 543 of the backrest mounting projection 542 of the connecting member 52. ing. That is, the back mounting protrusion 542 of the connecting member 52 is inserted between the front structural wall 653 and the rear structural wall 656 of the lower frame 65, and the lower end of the front structural wall 653 on the upper surface of the connecting member 52. The back support member 61 is attached to the connecting member 52 in a state where the lower end of the rear structural wall 656 is in contact. In this attached state, the back surface 59 of the connecting member 52 and the back surface 657 of the rear structure wall 656 of the lower frame 65 are set to be flush with each other. Further, the back surface 657 of the rear structure wall 656 of the lower frame 65 is continuous with the first back surface 643 of the side frame 64, and the back surface 659 of the decorative wall 658 is the second back surface of the side frame 64. It is continuous with 644. An attachment groove 655 for accommodating the end edge of the tension member 62 is formed at the lower end of the front structural wall 653.

  The upper frame 66 connects the upper ends of the left and right side frames 64, and is an edge fixing portion for fixing the edge of the tension member 62 to the edge 667 of the upper edge of the back support member 61. A groove 661 is provided. The upper frame 66 is provided on the front side of the mounting groove 661, a backing curved surface 662 capable of backing up the tension member 62 and smoothly leading to the mounting groove 661, and an optional member provided on the rear side of the mounting groove 661. It has a groove 663 that is an engaging linear part for detachably attaching an attachment part of a certain hanger. The groove 663 is formed along the end edge 667, and the width dimension is gradually changed from the center toward the outer side. Specifically, the groove 663 has a width dimension, which is a separation distance L1 between the inner surface 664 on the front side and the inner surface 665 on the rear side, set to be gradually smaller from the center toward the left and right outer sides. The rear inner side surface 665 extends in the vertical direction at the center in the left-right direction, and has a V-shape that is flat when viewed from the rear and has a ridge line corresponding part 666 corresponding to the ridge line X211b formed on the attachment part X2 of the hanger X that is an optional member It is formed to make. Further, the groove 663 is set such that the distance between the front inner side surface 664 and the rear inner side surface 665 decreases toward the bottom surface 670.

  In more detail, the chair C is configured such that the hanger X and the mounting portions X2 and Y2 of the headrest Y, which are optional members, are detachably attached to the upper frame 66 of the back support member 61 that fastens the tension member 62. The upper frame 66 is provided with a mounting surface (a front inner surface 664 that forms a groove 663 and a rear inner surface 665) that are a pair of positioning surfaces that determine the mounting positions of the mounting portions X2 and Y2. The distance between the pair of mounting surfaces 664 and 665 is set so as to gradually change from the center to the left and right with the center in the left-right direction of the upper frame 66 as a boundary. , Y2 is in close contact with the mounting surfaces 664, 665 so that the mounting portions X2, Y2 are positioned in the left-right direction.

  In addition, the engaging wire including the groove 663 includes a slit, a rib, and the like.

  On the other hand, in this embodiment, a pair of front inner side surface 664 and / or rear inner side surface 665 constituting the groove 663 and a downward surface 669 which is the outer surface of the upper frame 66 are also paired. A mounting surface which is a positioning surface is configured.

  That is, the mounting surfaces (the front side inner surface 664 that forms the groove 663 and the rear side inner surface 665) that are the pair of positioning surfaces are arranged in pairs in the front-rear direction, and the front side inner surface that forms the groove 663 is arranged. The distance between the pair of mounting surfaces formed by the side surface 664 and the rear inner surface 665 is set so as to gradually decrease from the center to the left and right with the center in the left-right direction of the upper frame 66 as a boundary. Yes.

  In addition, a pair of positioning surfaces, the mounting surfaces (the front inner surface 664 (or the rear inner surface 665) and the downward surface 669) are arranged in a pair diagonally up and down. The separation distance is set so as to gradually become shorter from the center to the left and right with the left-right direction center of the upper frame 66 as a boundary.

  In the present embodiment, the upper frame 66 is positioned on the pair of mounting surfaces (the front inner surface 664 and the rear inner surface 665), and the mounting portions X2, Y2 of the headrest Y are the upper A fixing element for preventing the frame 66 from coming off is not provided.

  In this embodiment, the upper frame 66 is provided with a pair of left and right mounting surfaces that determine the mounting positions of the mounting portions X2 and Y2. Specifically, the pair of left and right mounting surfaces is based on the center of the upper frame 66 in the left-right direction, that is, the line corresponding to the center line in the left-right direction of the upper frame 66, that is, the valley line 669b corresponding to the ridge line Alternatively, it is a plane that is symmetric with respect to the boundary, and in this embodiment, the symmetric plane extends in a substantially straight line toward the front. Note that the symmetrical surface may extend rearward, or may be a non-circular arc shape that is not limited to a substantially straight line shape.

  The groove 663 has a shape for causing an aesthetic appearance, and the attachment portions X2 and Y2 of the attachment portions X2 and Y2 are in the left-right direction in a state where the attachment portions X2 and Y2 of the hanger X and the headrest Y which are optional members are in close contact with each other. The design-shaped part which has the attachment surface which also performs positioning of is formed. The design shape portion is provided on the upper frame 66, and the mounting surfaces constituting the design shape portion correspond to the inner side surfaces 664 and 665 of the groove 663 in the present embodiment.

  That is, the design-shaped portion is formed on the fore edge surface forming the edge 667 of the back support member 61. The small edge surface constitutes an end edge 667 of the back support member 61, a backing curved surface 662, a mounting groove 661 which is an edge fixing portion located on the rear side of the backing curved surface 662, and the mounting groove The groove 663, which is a linear part for engagement that exhibits a positioning function for attaching an optional member while exhibiting a function for improving the designability provided on the rear side of 661, is mainly configured.

  Here, the “designed shape portion” is configured so as to cause an aesthetic appearance (aesthetic appearance) through the shape of the article. For example, a mounting protrusion, a screw insertion hole, etc. are exclusively attached. This is a concept excluding the shape only for the purpose or the shape only for the positioning.

  In the present embodiment, the design-shaped portion is formed on a fore edge surface that forms the edge 667 of the upper frame 66 and a downward surface 669 that is an outer surface continuous to the fore edge surface. Unlike the simple flat plate surface, the downward surface 669 has a curved shape so as to protrude outward, and constitutes a design shape portion that can give an aesthetic impression to the viewer. . The design-shaped portion has a bilaterally symmetric shape with the center in the left-right direction of the upper frame 66 as the center, and the ridge line X211b of the mounting portion X2 of the hanger X is formed on the inner surface 665 on the rear side that is the mounting surface in the center in the left-right direction A ridge line corresponding portion 666 to be positioned is provided.

  The distance between the mounting surfaces 664 and 665 of the groove 663 serving as the engaging linear portion and the outer surface 669 for mounting the mounting portion X2 in cooperation with the mounting surfaces 664 and 665 is outward from the center. It gradually becomes different. In particular, the separation distance between the front inner surface 664 as the mounting surface and the downward surface 669 of the upper frame 66 as the outer surface is significantly different, and the separation distance gradually decreases from the center toward the outside. It is set to be.

  Further, as shown in FIGS. 19 and 20, the backrest 6 includes a visual recognition edge 621 on the seating surface side of the tension member 62 and the edge fixing as viewed from the direction in which the end edge 667 of the back support member 61 extends. The separation distance L2 from the viewing edge 622 on the fixed side fixed to the portion is partially different. Specifically, the separation distance L2 of the tension member 62 fixed to the upper frame 66 is gradually decreased from the center toward the outer side. That is, in this embodiment, an attachment groove 661 that opens in the direction in which the end edge 667 extends is formed in the end edge 667 of the upper frame 66, and the edge of the tension member 62 is inserted into the attachment groove 661. It is fixed. The visible edge on the side fixed to the mounting groove 661 is referred to as the fixed-side visual edge 622. The “direction in which the end edge 667 extends” means a direction in which the center line in the thickness direction of the upper frame 66 extends, as shown in FIG. 20, and the mounting groove 661 is also formed along this direction. Yes. The visible edge on the side forming the seating surface guided by the backing curved surface 662 is referred to as the viewing edge 621 on the seating surface side.

  The tension member 62 has a mesh shape that receives the load of the seated person. More specifically, the tension member 62 has its left and right edges inserted and fixed in the mounting groove 642 of the side frame 64, its lower edge inserted and fixed in the mounting groove 655 of the lower frame 65, and its upper edge fixed. By being inserted into the mounting groove 661 of the upper frame 66 and being fixed, it is stretched on the back support member 61 having a frame shape.

  The lumbar support device 8 includes the left and right side frames 64, a plurality of lines 83 extending between the side frames 64, and a line in another line by an external force applied to the lines 83 in a specific line. And a tension state adjusting mechanism 84 that reciprocally changes the tension of the strip 83. In the present embodiment, the plurality of linear bodies 83 are arranged in parallel to each other, and the “row” is used for convenience to count the linear bodies 83 that are extended in the left-right direction. It is.

  The left side frame 64 in the front view includes the side frame main body 641a, a lumbar support member 81a that is disposed in the left lumbar mounting space 647a of the side frame main body 641a and supports the linear body 83, and the lumbar support member. And a cover 81d covering the front side of 81a. The lumbar support member 81a and the cover 81d are fastened together with a bolt B9 inserted from the front side to the front end of a mounting boss 647h protruding from the rear wall 647f of the side frame body 641a. The main part of the tension state adjusting mechanism 84 is disposed between the lumbar support member 81a and the rear wall 647f. The lumbar support member 81a is provided with a plurality of bending guide portions 81b that guide the rear end while slidably supporting the left end portions 831 of the plurality of lines 83, and these bending guide portions. The front side of 81b is closed by the cover 81d.

  The right side frame 64 in the front view includes the side frame main body 642a, a lumbar support member 82a disposed in the right lumbar mounting space 648a of the side frame main body 642a, and a cover that covers the front side of the lumbar support member 82a. 82d. The lumbar support member 82a and the cover 82d are fastened together with a bolt B10 inserted from the front side to the front end of a mounting boss 648h provided on the rear wall 648f of the side frame body 642a. The lumbar support member 82a includes a plurality of linear guide portions 82b that slidably support the right end portion 834 of the plurality of lines 83, and outer ends of the linear guide portions 82b that are vertically adjacent to each other. And a curved guide portion 82c having a semicircular arc shape that smoothly continues, and the front sides of the linear guide portion 82b and the curved guide portion 82c are closed by the cover 82d.

  The linear body 83 is made of a wire that can be flexibly deformed, and the plurality of rows of linear bodies 83 are made of a single wire material. In other words, except for the left end portion 832 of the top row of line bodies 83 and the left end portion 833 of the bottom row of line bodies 83, each row of line bodies 83 is a lumbar. The mounting spaces 647a and 648a are integrally continuous. In other words, the wire 83 in each row and the connecting wire 835 that connects the ends 831 and 834 of the adjacent wire 83 in the side frame 64 are constituted by one wire material. . In this embodiment, the line 83 in each row is located in the vicinity of the tension member 62 that receives the load of the seated person, and is movable relative to the tension member 62. The linear bodies 83 in each row are arranged in a state of being stretched between the side frames 64, and come into contact with the tension members 62 deformed rearward when seated. Therefore, the outer periphery is individually covered with the covering member 836 for the purpose of preventing the tension member 62 from being damaged.

  The covering member 836 is a tube-like member that is separate from the linear body 83 and covers the entire circumference of the linear body 83. Specifically, the covering member 836 is for exposure prevention that covers a main tube 837 that covers the entire circumference of the linear body 83 and a frame proximity portion of the linear body 83 including both ends of the main tube 837. And a sub tube 838.

  The tension state adjusting mechanism 84 is supported by the side frame main body 641a and disposed in the lumbar mounting space 647a, and a center portion in the vertical direction is rotatably supported by the fulcrum member 841. And an adjusting arm 842 capable of performing a balance operation in the front-rear direction in the lumbar mounting space 647a. The fulcrum member 841 and the adjustment arm 842 are disposed between the lumbar support member 81a and the rear wall 647f. The adjustment arm 842 includes an end portion attaching portion 843 for attaching the end portions of the wire 83 provided at both upper and lower end portions, and a plurality of curved guide portions 844 provided in the middle for smoothly guiding the wire material. ing. Each curved guide portion 844 is mainly composed of a semi-arc-shaped guide projection 845 formed on the side surface of the adjustment arm 842, and a wire material is removed from the protruding end of the guide projection 845. A flange 846 is provided integrally to prevent it.

  A plurality of rows of line bodies 83 are arranged in parallel with a space between the left lumbar support member 81a and the right lumbar support member 82a, and the left end of the line bodies 83 of each adjacent row is arranged. The left connecting wire portion 835 that connects the portions 831 is guided rearward by the bending guide portion 81b and is slidably supported by the curved guide portion 844 of the adjusting arm 842, and the adjacent line members A right connecting line portion 835 that connects the right end portions 834 of 83 is slidably supported by the curved guide portion 82c of the right lumbar support member 82a. Further, the left end portion 832 of the uppermost line 83 is guided to the rear by the bending guide portion 81b and is rotatably attached to the upper end mounting portion 843 of the adjustment arm 842. . The left end portion 833 of the lowermost line 83 is guided rearward by the bending guide portion 81b and rotatably attached to the lower end attachment portion 843 of the adjustment arm 842. Yes.

  The lumbar support device 8 also includes a tension adjusting unit 85 for changing the average tension of the line 83 in each row. The tension adjusting unit 85 is for changing the holding position of the fulcrum member 841 in the front-rear direction. The tension adjustment unit 85 is provided with a screw hole 851 in the fulcrum member 841 and a screw rod 852 screwed into the screw hole 851 on the side. An operation grip 853 for rotating the screw rod 852 is provided at the outer penetrating end of the screw rod 852 so as to be rotatably inserted in the rear wall 647f of the frame main body 641a. The front end of the screw rod 852 is rotatably supported by the lumbar support member 81a.

  In such a lumbar support device 8, the adjusting arm 842 is appropriately rotated in the front-rear direction by an external force applied to the linear body 83 in a specific row, and the tension of the linear body 83 in other rows is relatively changed. It is like that. Specifically, for example, when the upper linear member 83 is pushed rearward, the upper end side of the adjustment arm 842 is pulled forward and rotated, that is, the fulcrum member 84 that is the rotation axis of the adjustment arm 842 is a boundary. Thus, the tension of the linear body 83 is changed relative to the upper and lower sides, and the tension of the linear body 83 in another row attached or held to the lower end side of the adjustment arm 842 becomes stronger.

  Further, when the operation grip 853 is rotated to change the holding position of the fulcrum member 841 in the front-rear direction, the tension of the line bodies 83 in all rows changes. As described above, when the tension of the line 83 in each row changes in a reciprocal manner, each connecting line 835 slides appropriately with respect to the corresponding curved guides 82c and 844. Become.

  The lumbar support device 8 configured as described above includes left and right lumbar support members 81a and 82a, an adjustment arm 842 disposed on the rear side of the lumbar support members 81a and 82a, the lumbar support members 81a and 82a, and the adjustment. A unit 86 having a linear body 83 spanned over the arm 842 and a tension adjusting portion 85 excluding the operation grip 853 is provided, and the unit 86 is incorporated into the side frame main bodies 641a and 642a from the front side. ing. The threaded rod 852 of the tension adjusting unit 85 includes a threaded rod main body 854 screwed to the fulcrum member 841 and a retaining rod 855 screwed to the rear end of the threaded rod main body 854. When the unit 86 is attached to the side frame main body 641a, the screw rod main body 854 is passed through the rear wall 647f of the side frame main body 641a with the retaining rod 846 removed, and the screw rod main body 854 An operation grip 853 is attached to the outer periphery of the penetrating end, and a retaining rod 855 is screwed to the penetrating end. The lumbar support members 81a and 82a are screwed and fixed to the side frame bodies 641a and 642a together with the covers 81d and 82d while being accommodated in the lumbar mounting spaces 647a and 648a.

  The backrest 6 having the above-described configuration and the seat 4 described above are tilted at a constant ratio by the synchro-rocking mechanism R.

<Synchloro-packing mechanism>
As shown in FIGS. 9 and 10, the synchro-rocking mechanism R supports the front connection member 47 held by the seat frame 3 to the support base 2 so as to be movable back and forth, and is held by the seat frame 3. Further, the rear connecting member 46 is pivotally supported on the back frame 5 so that the backward tilting operation of the backrest 6 and the sinking operation of the seat 4 are interlocked. That is, the synchro-rocking mechanism R is connected to the front end portion 34 of the support base 2 via the front connecting member 47 so that the front end side of the seat frame 3 that supports the seat 4 can be moved back and forth. The rear end side is pivotally supported on the back frame 5 via the rear connecting member 46. Specifically, the front connecting member 47 is slidably supported by a long hole 212 provided in the front end portion of the support base 2 and extending in the front-rear direction. The rear connecting member 46 also serves as a pivot point of the seat forward tilting means 45 described above, and is rotatable on a bearing portion 513 provided on the back support rod 51 of the back frame 5.

<Armrest>
As shown in FIGS. 1 to 5, 13 to 18, 22, 23, 26, and 27, the armrest 7 is one of optional members that are detachably attached to the chair body C1. And an elbow frame 71 having a base end portion 73 attached to the attachment region 58 of the connecting member 52 of the chair main body C1 and an armrest main body 72 provided at a distal end portion 75 of the elbow frame 71.

  The elbow frame 71 includes a base end portion 73 that extends along the lower edge of the backrest 6, an intermediate bend portion 74 that is provided continuously with the base end portion 73 and bends forward and upward, and this intermediate bend. It is provided with the front-end | tip part 75 provided continuously from the part 74 and extended in front upper direction. The armrest main body 72 is provided at the upper end of the distal end portion 75.

  The armrest main body 72 includes an elbow rest 721 formed integrally with the elbow frame 71 and an elbow rest 722 attached on the elbow rest 721. The elbow receiver 721 is integrally formed with the elbow frame 71 and a synthetic resin.

  The base end portion 73 of the elbow frame 71 corresponding to the base end portion of the armrest 7 has a shape that fits into the recessed mounting region 58 of the connecting member 52, and mainly from the rear side to the mounting region 58. It is designed to be fitted. That is, the base end portion 73 of the elbow frame 71 includes an upper surface 731 that is in close contact with or very close to the facing wall 54 on the connecting member 52, a lower surface 732 that is in close contact with or very close to the lower facing wall 55, and the base A base end surface 733 that is in close contact with or very close to the end side coupling wall 56, a back surface 734 that is flush with the back surface 59 of the connection member 52, and a front surface 735 that corresponds to the back side connection wall 57 of the connection member 52. It is a thing. The front surface 735 includes an inner region 76 that faces the head of the bolt, an intermediate region 77 that abuts on the inner coupling wall 57, and an outer region that is located outside the outer edge 572 of the inner coupling wall 57. 78. At the boundary between the inner region 76 and the intermediate region 77, an inner stepped portion 79 that engages with the edge of the connecting member mounting protrusion 515 of the back support rod 51 is formed. Further, an outer stepped portion 70 is formed at the boundary between the intermediate region 77 and the outer region 78 so as to engage with the outer edge 572 of the back side coupling wall 57.

  The base end portion 73 of the elbow frame 71 is fixed to the connecting member 52 using the first mounting bolt B4 and the second mounting bolt B5. More specifically, the base end portion 73 of the elbow frame 71 has a first bolt insertion hole 736 whose axis is aligned with the bolt insertion hole 552 and the escape hole 544 of the connection member 52, and the connection member 52. The bolt insertion hole 553 and the nut part 545 are provided with a second bolt insertion hole 738 whose axis is aligned. An embedded nut 737 is disposed in the middle of the first bolt insertion hole 736. Then, the base mounting end B5 is inserted into the bolt insertion hole 552 of the connecting member 52 and the first bolt insertion hole 736 of the elbow frame 71 from below, and is screwed into the embedded nut 737 and tightened to tighten the base end. The portion 73 is brought into close contact with and fixed to the facing wall 55 below the connecting member 52. The tip of the first mounting bolt B4 that has passed through the embedded nut 737 is inserted into a relief hole 544 provided in the upper facing wall 54. Also, a nut portion provided on the facing wall 54 above the connecting member 52 includes a second mounting bolt B5 inserted from below into the bolt inserting hole 553 of the connecting member 52 and the second bolt inserting hole 738 of the elbow frame 71. The base end portion 73 is brought into close contact with and fixed to the upper and lower facing walls 54 and 55 of the connecting member 52 by screwing and tightening to the lower half portion of 545. In other words, the base end portion 73 is clamped from above and below by the clamping surface 541 of the upper facing wall 54 and the clamping surface 551 of the lower facing wall 55 by the tightening force of the second mounting bolt B5 as a fastening member. It is fixed. That is, the tip portions of the upper and lower facing walls 54 and 55 that are not supported by the inner side coupling walls 57 form a cantilever support structure. Therefore, the base end portion 73 is firmly fixed to the connecting member 52 by elastically deforming the tip portions of the upper and lower facing walls 54 and 55 with the second mounting bolt B5 and bringing the pressing surfaces 541 and 551 closer to each other. Has been.

  When the armrest 7 is not attached to the chair body C1, a cover 7a that is one of optional members is attached instead of the armrest 7. As shown in FIGS. 26 and 27, the cover 7 a is attached to the attachment region 58 in the connecting member 52 of the chair body C <b> 1 and extends along the lower edge of the backrest 6. That is, the cover 7a has the same shape as the base end portion 73 of the armrest 7 described above, and has a shape that fits into the recessed mounting region 58 of the connecting member 52. The cover 7a is attached to the chair body C1. In the mounted state, the top edge of the upper and lower facing walls 54 and 55 of the connecting member 52 and the outer edge of the cover 7a are configured to coincide with each other.

<Hanger>
As shown in FIGS. 1 to 4, 28, and 30, the hanger X, which is an optional member, is used to hang and hold clothes. Mounting portion X2).

  The hanger body X1 is made of an elastically deformable resin. The hanger body X1 supports a garment hanging portion X11 extending substantially horizontally in the left-right direction at the upper portion and a lower side of the garment hanging portion X11, and forms a pair that moves toward each other in the downward direction when viewed from the front. The main component is the arm X12.

  The hanger mounting portion X2 is formed at a portion where the lower ends of the pair of support arms X12 are gathered, the mounting portion main body X21 formed integrally with the hanger main body X1 and resin, and fixed to the mounting portion main body X21. And a fixing member X22 that is fastened by means of a mounting screw N1.

  The attachment portion main body X21 has a portion protruding rearward from the upper frame 66 so as to support the hanger main body X1 while being separated from the backrest 6 rearward. The attachment main body X21 has the projection X211 fitted in the groove 663 constituting the design shape portion provided on the upper frame 66 of the backrest 6 described above, and the attachment that has passed through the screw insertion hole X221a of the fixing member X22. And a nut portion X212 to which the screw N1 is screwed. The convex portion X211 of the mounting portion main body X21 projects forward and obliquely downward, and matches the ridge line corresponding portion 666 provided on the inner side surface 665 on the rear side of the groove 663 on the lower surface X211a of the convex portion X211. A ridge line X211b is formed.

  The fixing member X22 is attached to the attachment portion main body X21 with an attachment screw N1. The fixing member X22 is configured to be able to tightly hold the upper frame 66 of the backrest 6 in cooperation with the attachment portion main body X21. The fixing member X22 is integrally provided at the front end of the lower fixing portion X221 with a lower fixing portion X221 having a screw insertion hole X221a and an upper surface having a contact surface X221b that contacts the downward surface 669 of the upper frame 66. And a front fixing portion X222. The front fixing portion X222 has a substantially L shape in cross-section, and in cooperation with the lower fixing portion X221, a protruding portion formed to protrude forward and obliquely downward to the lower portion of the upper frame 66 of the backrest 6. It fits closely to 668.

  Therefore, the hanger X is attached to the backrest 6 as follows. First, the fitting recess X223 formed between the front fixing portion X222 and the lower fixing portion X221 of the fixing member X22 is externally fitted to the protruding portion 668 at the center in the left-right direction of the upper frame 66. Next, the ridge line X211b formed on the convex part X211 of the attachment part main body X21 is made to coincide with the ridge line corresponding part 666 of the groove 663 of the backrest 6, and the convex part X211 is fitted in the groove 663. At this time, the lower surface X211a having the ridge line 211b of the hanger body X1 and the convex portion X211 is in close contact with the inner side surface 665 on the rear side of the groove 663 constituting the mounting surface, and positioning in the left-right direction is performed. Thereafter, the attachment screw N1 is passed through the screw insertion hole X221a of the fixing member X22 and then screwed into the attachment portion main body X21, and the fixing member X22 and the attachment portion main body X21 are connected with the upper frame 66 of the backrest 6. Screwed in the sandwiched state.

<Headrest>
As shown in FIGS. 1 to 4, 29, and 31, the headrest Y that is an optional member supports the seated person's head from the rear, and the headrest body Y1 and attachment for attaching the headrest body Y1 Part Y2 (headrest attachment part Y2).

  The headrest body Y1 has a cushion member Y11 having a substantially rectangular shape in front view that supports the head of the seated person at the top, a support member Y12 that supports the rear part of the cushion member Y11, and a pair of left and right from the lower end of the support member Y12. The support arm Y13 extending downward is mainly configured.

  The headrest mounting portion Y2 includes a mounting portion main body Y21 formed integrally with the lower end of the pair of support arms Y13, and a fixing member Y22 fixed to the mounting portion main body Y21 by a mounting screw N2 serving as a fixing tool. It has.

  The mounting portion main body Y21 is a nut portion Y212 in which the convex portion Y211 that fits into the groove 663 provided in the upper frame 66 of the backrest 6 and the mounting screw N2 that has passed through the screw insertion hole Y221a of the fixing member Y22 are screwed together. And have. The convex portion Y211 of the attachment portion main body Y21 projects forward and obliquely downward. The convex portion Y211 is set so that its thickness dimension gradually decreases as it goes outward, and the grooves 663 located on the left and right sides of the upper frame 66 corresponding to the convex portion Y211 are outward. The width dimension is set to be short.

  The fixing member Y22 is attached to the attachment portion main body Y21 with an attachment screw N2. The fixing member Y22 is configured to be able to tightly sandwich the upper frame 66 of the backrest 6 in cooperation with the attachment portion main body Y21. The fixing member Y22 includes a lower fixing portion Y221 having a screw insertion hole Y221a and a contact surface Y221b that contacts the downward surface 669 of the upper frame 66, and a front fixing integrally formed at the front end of the lower fixing portion Y221. And a portion Y222. The front fixing portion Y222 has a substantially L shape in cross section, and is a protruding portion formed in front of the upper frame 66 and projecting diagonally downward in cooperation with the lower fixing portion Y221. It fits into 668.

  Therefore, the attachment of the headrest Y to the backrest 6 is performed as follows. First, the fitting recess Y223 formed between the front fixing portion Y222 and the rear fixing portion Y222 of the fixing member Y22 is externally fitted to the protruding portions 668 on the left and right sides of the upper frame 66 in the backrest 6. At this time, the headrest main body Y1 and the mounting portion main body Y21 are positioned in the left-right direction by closely contacting the front inner side surface 664 and the rear inner side surface 665 on the left and right sides of the groove 663 constituting the mounting surface. The distance between the front inner side surface 664 and the rear inner side surface 665 at both left and right sides of the upper frame 66 is a gradually narrower groove that is set shorter toward the outside. The protrusion Y211 is closely fitted into the gradually narrow groove. Next, the convex portion Y211 of the attachment portion main body Y21 is fitted into the groove 663. Thereafter, the mounting screw N2 is passed through the screw insertion hole Y221a of the fixing member Y22 and then screwed into the mounting portion main body Y21, and the fixing member Y22 and the mounting portion main body Y21 are sandwiched between the upper frames 66. Screw it on.

  As described above, the chair C according to the present embodiment is detachable with the hanger X as an optional member and the attachment portions X2 and Y2 of the headrest Y on the upper frame 66 of the back support member 61 for fastening the tension member 62. The upper frame 66 is provided with a pair of mounting surfaces (a front inner surface 664 and a rear inner surface 665) that determine the mounting positions of the mounting portions X2, Y2. The separation distance between the mounting surfaces 664 and 665 is set so as to gradually change from the center to the left and right with the horizontal center of the upper frame 66 as a boundary, and the mounting portions X2 and Y2 are connected to the mounting surface. The mounting portions X2, Y2 are positioned in the left-right direction while being in close contact with 664, 665. For this reason, the chair C provided with the backrest 6 which can play the beauty | look with respect to a viewer suitably and can contribute effectively to mounting | wearing of the hanger X and headrest Y which are optional members can be provided.

  That is, the chair C according to the present embodiment is configured such that the hanger X and the attachment portions X2 and Y2 of the headrest Y as the optional members are detachably attached to the upper edge portion of the back support member 61 constituting the backrest 6. The back support member 61 has a shape for causing aesthetic appearance, and the mounting surface 664 also positions the mounting portions X2, Y2 in the left-right direction in a state where the mounting portions X2, Y2 are in close contact with each other. , 665 which is a design-shaped portion having 665. For this reason, the chair C provided with the backrest 6 which can play the beauty | look with respect to a viewer suitably and can contribute effectively to mounting | wearing of the hanger X and headrest Y which are optional members can be provided.

  A groove 663 is formed in a fore surface forming the end edge 667 of the back support member 61 and a downward surface 669 which is an outer surface on the back side continuous with the fore edge surface. In other words, the design-shaped portion is formed in the groove 663 serving as the engaging linear portion formed along the end edge 667 forming the facet surface and the downward surface 669 serving as the outer surface. For this reason, in order to comprise the site | part which is easy to be seen by a viewer, not only the design property can be effectively exhibited but also the attachment portions X2 and Y2 of the hanger X and the headrest Y can be easily attached.

  The groove 663 serving as the engaging linear portion has a gradually varying width dimension from the center toward the outside, and more specifically, the width dimension gradually decreases from the center toward the outside. Is set to That is, the distance between the mounting surfaces 664 and 665 of the groove 663 and the downward surface 669 for mounting the mounting portions X2 and Y2 in cooperation with the mounting surfaces 664 and 665 is outward from the center. It is gradually different. For this reason, it becomes easy to perform the molding for positioning the option member in the left-right direction, and can contribute to the improvement of the design.

  Particularly, in this embodiment, the back support member 61 has a frame shape having at least an upper frame 66, and the upper frame 66 is provided with a groove 663 and a downward surface 669 which are the design-shaped portions. Therefore, the design freedom for attaching the hanger X and the headrest Y, which are optional members, is high. That is, since it has the upper frame 66 in which a space is formed in the lower part, for example, the lower part of the upper frame 66 is configured with an optional member such that the mounting portions X2 and Y2 are sandwiched between the upper frame 66 It is easy to use for mounting.

  The back support member 61 does not include fixing elements such as screw holes and protrusions for attaching optional members. More specifically, fixing of screw holes and protrusions for preventing the hanger X and the mounting portions X2 and Y2 of the headrest Y, which are optional members positioned on the mounting surfaces 664 and 665, from coming off from the back support member 61. Since the element is not included in the back support member 61, there is no loss of aesthetic appearance, and the design freedom for exhibiting an appearance with excellent design is excellent.

  Since the groove 663 has a bilaterally symmetric shape with the center in the left-right direction of the back support member 61 as a center, it becomes easy to form a suitable appearance excellent in design and the left-right direction of the hanger X and the headrest Y Can be effectively positioned.

  The attachment surface 665 has a ridge line corresponding portion 666 where the ridge line X211b of the attachment part X2 of the hanger X which is an optional member is positioned. For this reason, when the hanger X is attached, the ridgeline X211b formed by the top of the mountain shape is aligned with the ridgeline corresponding portion 666, so that the hanger X can be suitably attached without making a mistake at a desired position.

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

  A pair of mounting surfaces, which are a pair of positioning surfaces, may be provided on the upper frame, may be paired in the vertical direction, may be paired in the front-rear direction, or paired in the left-right direction. It may be an eggplant. Further, the mounting surface may be a straight line (flat plate), or the mounting surface may be a non-circular arc (curved surface).

  In other words, the design-shaped part may be provided on the upper edge portion of the back support member, and is not limited to that shown in the present embodiment.

  Hereinafter, the example will be described as another embodiment with reference to schematic views partially showing the back support member shown in FIGS. In the other embodiments, the same or corresponding components as those of the above-described embodiment will be described with the same reference numerals, and detailed description thereof will be omitted or simplified.

  A back support member 61 shown in FIG. 32 has a groove 663 that linearly extends to the left and right on the small edge surface that forms the upward edge 667 of the upper frame 66 that is the upper edge portion, and an outer surface that is continuous with the small edge surface. It has a back surface 669. The back surface 669 constitutes a design-shaped portion in which a curved surface curved so as to protrude rearward is formed. That is, the designed shape portion is formed only on the back surface 669. In this case, the attachment portion (not shown) of the optional member is positioned in the left-right direction by being in close contact with the attachment surfaces as a pair of positioning surfaces of the groove 663 and the back surface 669. Even such a thing will exhibit its intended purpose.

  The back support member 61 shown in FIG. 33 has a groove 663 extending in the left-right direction on the small edge surface forming the upward edge 667 of the upper frame 66 that is the upper edge portion, and the rear surface that is an outer surface continuous with the small edge surface. 669. The groove 663 has a symmetrical shape from the center in the left-right direction of the upper frame 66. The front inner surface 664 and the rear inner surface 665 that form a flat plate surface project from the center toward the outer side in a V shape that protrudes toward the seated person in plan view. Is set to be gradually shorter. The back surface 669 forms a flat plate surface. In other words, the design-shaped portion is formed only in the engaging linear portion which is the groove 663 formed along the end edge 66. In this case, the attachment portion (not shown) of the optional member is positioned in the left-right direction by being in close contact with the attachment surfaces as a pair of positioning surfaces of the groove 663 and the back surface 669. Even such a thing will exhibit its intended purpose.

  A back support member 61 shown in FIG. 34 has a flat surface as a small edge surface that forms an upward edge 667 of the upper frame 66 that is an upper edge portion, and a back surface 669 that is an outer surface continuous to the small edge surface. is there. The back surface 669 constitutes a design-shaped portion that is convex rearward and has a ridge line 669a at the center in the left-right direction. In this embodiment, no groove is formed. That is, the design-shaped part is formed mainly with the back surface 66. In this case, the mounting portion (not shown) of the optional member is positioned in the left-right direction by being in close contact with the mounting surface that is a pair of positioning surfaces on the left and right sides of the ridge line 669a that is the center line in the left-right direction of the back surface 669 Is made. Even such a thing will exhibit its intended purpose.

  The back support member 61 shown in FIG. 35 has a flat surface as the small edge surface that forms the upward edge 667 of the upper frame 66 that is the upper edge portion, and has a back surface 669 that is an outer surface continuous to the small edge surface. is there. The back surface 669 constitutes a design-shaped portion that protrudes forward and has a valley line 669b at the center in the left-right direction. In this embodiment, no groove is formed. That is, the design-shaped part is formed mainly with the back surface 66. In this case, the mounting portion (not shown) of the optional member is in close contact with the mounting surface which is a pair of positioning surfaces on the left and right sides of the valley bottom line 669b which is the center line in the horizontal direction of the back surface 669. Positioning is done. Even such a thing will exhibit its intended purpose.

  The back support member 61 shown in FIGS. 36 and 37 is formed by forming a lower surface 671 of the upper frame 66 as an upper edge so as to protrude upward in a rear view, and constitutes a design-shaped portion. . The upper frame 66 of the back support member 61 in FIG. 36 constitutes a design-shaped part having a valley line 671a at the center in the left-right direction of the lower surface 671. In addition, the upper frame of the back support member 61 in FIG. 37 constitutes a design-shaped portion in which the lower surface 671 is curved. In each of the embodiments shown in FIGS. 36 and 37, no groove is formed. That is, the design-shaped portion of the back support member 61 in FIGS. 36 and 37 is mainly formed of the lower surface 671. In this case, the attachment portion (not shown) of the optional member is positioned in the left-right direction in close contact with the attachment surfaces as a pair of positioning surfaces of the upper surface and the lower surface 671. Even such a thing will exhibit its intended purpose.

  What is shown in FIG. 38 is a plan view and schematically shows the upper frame 66 of the back support member 61. This includes an intermediate upper frame component 66a extending in the left-right direction at the center of the upper frame 66, and left and right upper frame components extending diagonally forward from the end of the intermediate upper frame component 66a on the seating surface side. 66b, 66c. In this embodiment, a symmetrical shape is formed with the center line ce in the left-right direction as a boundary, and the pair of mounting surfaces 66b1 and 66c1 which are the outer surfaces of the left and right upper frame components 66b and 66c are linearly facing forward. It extends. The left and right end portions of the upper frame 66 are connected to the upper end portions of the left and right side frames 64. In this case, the mounting portions (not shown) of the option members are positioned in the left-right direction by being in close contact with the mounting surfaces 66b1 and 66c1, which are positioning surfaces provided in pairs on the left and right. Even such a thing will exhibit its intended purpose.

  In this embodiment, the pair of mounting surfaces 66b1 and 66c1 extend in a straight line. However, instead of this, they may extend in a non-circular arc shape. That is. In this embodiment, the pair of attachment surfaces 66b1 and 66c1 extend forward, but it goes without saying that they may extend rearward.

  Each embodiment mentioned above is an illustration to the last, and a various deformation | transformation is possible in the range which does not deviate from this invention besides. For example:

  The option member is not limited to a hanger or a headrest, and may be a lighting device or a display device, for example. In other words, the optional member has a device main body that can provide a convenient function for a seated person and a support arm that supports the device main body, and any attachment member is provided on the support arm. It may be a thing.

  The back support member is not limited to the frame shape as described in the present embodiment, and various shapes can be employed. For example, the back support member may be plate-shaped, or may be a plate-shaped material in which a plurality of through holes are formed, or a so-called resin mesh type.

  The engaging linear member is not limited to the groove, and may be a slit or a rib-like member.

  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.

6 ... Backrest 61 ... Back support member 663 ... Groove 667 ... End edge 664 ... Front inner surface (mounting surface)
665 ... rear inner surface (mounting surface)
X ... Hanger (optional member)
Y ... Headrest (optional member)
X2 ... Hanger attachment part (attachment part)
Y2 ... Headrest attachment part (attachment part)

Claims (1)

In the chair in which the attachment portion of the optional member can be attached to and detached from the upper frame of the back support member for fastening the tension member,
The upper frame connects the upper ends of the left and right side frames of the back support member,
The upper frame is provided with a pair of positioning surfaces that determine the mounting position of the mounting portion,
The separation distance between the pair of positioning surfaces is set so as to gradually shorten as the distance from the center in the left-right direction in the upper frame increases .
Positioning in the left-right direction of the mounting portion is performed in a state where the mounting portion is in close contact with the positioning surface,
The pair of positioning surfaces are configured by a front inner surface in a groove formed upward in the longitudinal direction of the upper frame and a back surface which is a flat plate surface forming the outer surface of the upper frame ,
The groove includes a front inner surface disposed in a V shape projecting toward a seated person in plan view, and a rear inner surface forming a flat plate surface facing the front inner surface. And
The chair set so that the separation distance between the front inner surface and the rear inner surface is gradually shortened from the center to the left and right with the horizontal center of the upper frame as a boundary .

Images