JP6405770B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a lumbar support for supporting a waist of a seated person.

  Conventionally, this type of chair is known to have a lumbar support that pushes and supports the waist of a seated person forward (see, for example, Patent Document 1).

  The conventional lumbar support is configured to indirectly support the lumbar portion of the seated person via a tensioned fabric or the like by positively pushing the lumbar portion of the seated person forward. For this reason, in a conventional chair, a certain rigidity is required in order to positively push out forward to a portion related to the lumbar support, for example, a portion supporting the lumbar support at both ends of the lumbar support or the backrest. It was supposed to be. In other words, in a conventional chair having a lumbar support, a high degree of rigidity is required in a portion related to the lumbar support, so that the degree of freedom in design for simplifying the structure and reducing the weight is limited. It was a thing.

JP 2006-110014 A

  The present invention has been made by paying attention to the above circumstances, and in a chair having a lumbar support, it is excellent in design flexibility for simplification of the structure and weight reduction in a portion related to the lumbar support. Is to provide a chair.

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

The chair according to claim 1 is a backrest in which a back support member that is elastically bent in a thickness direction in accordance with a load from a seated person is disposed inside the back frame, and a lumbar support provided on the backrest. The lumbar support is disposed on the back side of the backrest with both ends supported by the back frame, and the back support member is bent backward when the back support member is bent backward. a receiving member to suppress the deflection of the back support member back directly or indirectly receiving the state, and are not provided with a deflection amount and adjusting mechanism for changing the position received by the receiving member in the longitudinal direction, the back The frame includes left and right side frame portions, and the receiving member includes a belt in which a base end portion is supported by one of the side frame portions and a distal end side is extended in the direction of the other side frame portion. The base end is supported by the other side frame part. A buckle for holding the front end side of the belt, and the bending amount adjusting mechanism is disposed at an interval in the left-right direction provided on the belt with an engagement portion provided on the buckle. A plurality of engaged portions, wherein the engaging portion can be selectively engaged with any of the engaged portions, and the buckle is inserted into a front end portion of the belt. A buckle body having a belt insertion hole and an operation arm provided in a cantilevered state on the buckle body and capable of elastically rotating in a direction in which a free end side contacts and separates from the belt. together with the engagement portion on the free end side of the arm is provided, on the belt, the plurality of engaged portions are shall be provided.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the lumbar support is disposed on the back side of the plate member, the plate member being in contact with the back surface of the back support member. And a receiving member capable of receiving the back surface indirectly via the plate member.

  According to a third aspect of the present invention, in the configuration according to the second aspect, the plate member is attached to the receiving member, and the plate member and the receiving member are mainly attached to and detached from the back frame. It constitutes a possible unit body.

  According to a fourth aspect of the present invention, in the configuration according to the second or third aspect, the plate member is configured such that both end portions thereof are supported by both end portions of the receiving member.

According to a fifth aspect of the present invention, in the configuration according to the first, second, third, or fourth aspect , the belt includes a finger-hanging portion for hanging a finger, and the finger-holding portion and the buckle are respectively on one hand side. It is configured so that it can be operated in the direction in which both fingers are placed together.

According to a sixth aspect of the present invention, in the configuration according to the first, second, third, fourth, or fifth aspect, the lumbar support is supported by the backrest so as to be movable in the vertical direction.

  As described above, according to the present invention, in a chair having a lumbar support, it is possible to provide a chair having a high degree of design freedom for simplifying the structure and reducing the weight of a portion related to the lumbar support. It will be a thing.

The perspective view which shows one Embodiment of this invention. The partial enlarged front view in the embodiment. The exploded perspective view in the embodiment. AA line sectional view in FIG. Sectional drawing corresponding to FIG. 4 for demonstrating a lumbar support. The expanded sectional view for demonstrating a lumbar support. The disassembled perspective view seen from the back side for demonstrating a lumbar support. The disassembled perspective view seen from the back side for demonstrating a lumbar support. Action | operation explanatory drawing of a lumbar support. The operation explanatory view of lumbar support.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 and 3, for the sake of convenience of explanation, a tension fabric 32 that is a back support member constituting the backrest 3, and a seat and legs are omitted.

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

  The chair C is supported by the leg 1, a support base (not shown) attached to the upper end of the leg 1 so as to be horizontally rotatable, a seat 2 supported on the upper side of the support base, and a lower end rotatably on the support base. A back support rod (not shown) mainly composed of a pipe frame and a backrest 3 supported by the back support rod are provided. The backrest 3 is provided with a lumbar support S for supporting the back of the seated person P. The chair C includes a synchro-rocking mechanism mainly composed of a support base (not shown) for causing the seat 2 and the backrest 3 to operate in a backward tilting manner.

  Hereinafter, the chair C will be described in detail.

  The leg 1 includes a plurality of leg blades 12 each having a caster 11 at the lower end, and leg struts (not shown) that stand from a portion where the upper end portions of the leg blades 12 gather.

  The support base is mainly composed of a metal member, and is supported by the upper end portion of the leg column.

  The seat 2 includes a seat cushion (not shown), a skin material 21 stretched on the seat cushion, and a plate material (not shown) disposed on the lower surface of the seat cushion. The plate member is supported by a seat receiver (not shown) rotatably provided on the support base, and is fixed to the seat receiver with screws.

  The back supporter supports the backrest 3 and is interposed between the support base and the backrest 3. The lower portion of the back support rod is rotatably supported by the support base, and the upper portion thereof is connected to the lower end portion of the intermediate portion in the left-right direction in the backrest 3.

  Next, the backrest 3 and the lumbar support S in the present embodiment will be described.

  The backrest 3 is formed by placing a tension fabric 32, which is a back support member that is elastically bent in the thickness direction in accordance with the load from the seated person P, inside the back frame 31 having a square frame shape.

  The back frame 31 is mainly composed of an upper frame portion w1 and a lower frame portion w2 extending in the left-right direction, and left and right side frame portions w3 and w4 extending in the vertical direction connecting the upper frame portion w1 and the lower frame portion w2. It is configured. The left and right side frame portions w3 and w4 are shaped like a letter when viewed from the side. In other words, the left and right side frame portions w3 and w4 have a curved shape so that the portion corresponding to the waist of the seated person P in the middle portion in the vertical direction protrudes most forward.

  The back frame 31 is mainly composed of a front frame member 31f that supports the upholstery 32 and a rear frame member 31r that holds the front frame member 31 in a state where the front frame member 31f is in contact with the front surface side. ing. The upholstery 32 supports the peripheral edge thereof on the peripheral edge of the front frame member 31f.

  The front frame member 31f has a square frame shape when viewed from the front, and is integrally formed of resin. The front frame member 31f includes an upper frame portion f1 and a lower frame portion f2 extending in the left-right direction, and left and right side frame portions f3, f4 extending in the vertical direction connecting the upper frame portion f1 and the lower frame portion f2. ing. The front frame member 31f is provided with a screw insertion hole h at a predetermined location in the front-rear direction. The left and right side frame portions f3 and f4 of the front frame member 31f include front holding portions 311 and 312 for supporting the lumbar support S so as to be slidable in the vertical direction. The front holding portions 311 and 312 constitute a lumbar support support portion for supporting the lumbar support S together with holding portions 313 and 314 of the rear frame member 31r described later. The holding parts 311 and 312 on the front side are engaged with the front walls 311a and 312a that can be engaged with the front surfaces 513a and 523a of the engagement rails 513 and 523 in the lumbar support S, and the outer surfaces 513d and 523d of the engagement rails 513 and 523. Side walls 311b and 312b are provided. The engagement rails 513 and 523 of the receiving member 5 will be described in detail later.

  The rear frame member 31r includes an upper frame part r1 and a lower frame part r2 extending in the left-right direction, left and right side frame parts r3, r4 extending in the vertical direction connecting the upper frame part r1 and the lower frame part r2, and the lower frame part A back support rod connecting portion r5 is provided to project from the middle portion in the left-right direction of the frame portion r2 and connect to the back support rod. The rear frame member 31r is integrally formed of resin.

  The rear frame member 31 is a quadrangular frame-shaped portion having a quadrangular frame shape when viewed from the front, mainly including the upper frame portion r1, the lower frame portion r2, and the left and right side frame portions r3 and r4. The square frame-shaped portion is located on the front surface on the outer periphery side of the front frame member 31f and is exposed to the outside on the outer periphery region m1, and on the front surface on the inner periphery side of the square frame-shaped portion on the front surface of the front frame member 31f. And an inner peripheral edge area m2 on the side. The rear frame member 31r is provided with a nut n to which a screw v that has passed through the screw insertion hole h of the front frame member 31f described above is screwed at a predetermined position in the inner peripheral edge region m2.

  The left and right side frame parts r3, r4 in the rear frame member 31r include rear holding parts 313, 314 for supporting the lumbar support S so as to be slidable in the vertical direction. The rear holding portions 313 and 314 together with the front holding portions 311 and 312 constitute a lumbar support support portion for supporting the lumbar support S. The holding parts 313 and 314 on the rear side are rear walls 313a and 314a that can be engaged with the back surfaces 513b and 523b of the engagement rails 513 and 523 in the lumbar support S, and inner side surfaces 513c and 523c of the engagement rails 513 and 523, respectively. Side walls 313b and 314b that can be engaged are provided.

  The upholstery 32 has a stretchable mesh shape, and its outer peripheral end is sandwiched between the front frame member 31f and the rear frame member 31r.

  Next, the lumbar support S will be described in detail.

  The lumbar support S is disposed on the back side of the backrest 3 with both ends supported by the back frame 31. The lumbar support S is a plate member 4 that directly receives and supports the back surface of the stretched fabric 32 when the stretched fabric 32 is deflected rearward, and the stretched fabric 32 is disposed on the rear side of the plate member 4. And a receiving member 5 that indirectly receives the back surface of the upholstery 32 and suppresses the bending of the upholstery 32. In other words, the lumbar support S is provided on the back surface of the tension member 32 and the rear surface of the tension member 32 is indirectly received through the plate member 4. Receiving member 5 to be obtained.

  In addition, the plate member 4 may have received the back surface of the tension fabric 32 before the tension fabric 32 bends.

  In this embodiment, the plate member 4 is mounted on the receiving member 5, and the plate member 4 and the receiving member 5 constitute the unit body that can be attached to and detached from the back frame 31. . That is, the unit body including the plate member 4 and the receiving member 5 can be detachably attached to the back frame 31.

  The plate member 4 is mainly composed of a horizontally long plate-shaped portion, and is made of resin. The plate member 4 is supported in such a manner that its both end portions can be allowed to bend at both end portions of the receiving member 5. In other words, the plate member 4 is supported so that both ends thereof can be rotated and slidable in the left-right direction at both ends of the receiving member 5. More specifically, the left end portion that is one end side of the plate member 4 is supported by a belt 51 that constitutes the receiving member 5, and the right end portion that is the other end side of the plate member 4 is a buckle that constitutes the receiving member 5. 52 is supported. In other words, the plate member 4 includes a shaft support portion 42 for supporting an end portion of the shaft J provided in the receiving member 5 and extending in the vertical direction.

  The plate member 4 is for receiving a waist portion of the seated person P in a relatively wide area and providing a suitable holding feeling to the seated person P. The plate member 4 has a plate member main body 41 having a plate shape whose left and right end portions are set between the front frame member 31f and the upholstery 32 and is set in a horizontal size, and a rear surface of the plate member main body 41. Shaft support portions 42 provided at the four corners on the side for supporting the shaft j of the receiving member 5 described later. The plate member 4 is not directly supported by the back frame 31 but is indirectly supported by the back frame 31 via the receiving member 5.

  The plate member main body 41 is substantially linear in the left-right direction in plan view when not receiving the load of the seated person P, and protrudes rearward when receiving the load of the seated person P. It is a plate-like thing which can be bent like this. When the plate member main body 41 receives the load of the seated person P, the front surface side can be brought into contact with the back surface of the stretched fabric 32 and the rear surface side can be brought into contact with the front surface of the receiving member 5. .

  The shaft support portion 42 supports the plate member main body 41 so as to be rotatable with respect to the receiving member 5 and slidable in the left-right direction in cooperation with the plate member supporting portions 514 and 524 of the receiving member 5. The shaft support portion 42 extends rearward from the plate member main body 41 and a horizontal wall 421 for restricting the vertical movement of the plate member main body 41 relative to the receiving member 5, and inward from the rear end portion of the horizontal wall 421. A rear wall 422 for restricting the forward movement of the extending plate member 41 relative to the receiving member 5, and a horizontal movement of the extending plate member 41 relative to the receiving member 3 downward from the inner end of the horizontal wall 421. And an inner wall 423 for restricting. Note that the plate member main body 41 is engaged with projecting plates 514a and 524a of the receiving member 5 described later, and the rearward movement is restricted at the portion engaged with the projecting plates 514a and 524a.

  The receiving member 5 includes a belt 51 having a base end portion supported by a left side frame portion w3 which is one side frame portion and a distal end side extended in a right side frame portion w4 direction which is the other side frame portion; A buckle 52 that holds the distal end side of the belt 51 by supporting the base end portion on the right side frame portion w4 that is the other side frame portion is provided. The receiving member 5 is configured such that the length in the left-right direction can be changed by the cooperation of the belt 51 and the buckle 52. In other words, the receiving member 5 is configured to be able to adjust the degree of bending that protrudes backward by the bending amount adjusting mechanism J. The receiving member 5 directly receives the deflection of the plate member 41 that has been deformed by receiving the deflection of the stretch 32 due to the load of the seated person P.

  The belt 51 is mainly composed of a belt-like portion extending in the left-right direction, and has a belt body 511 that is bent so as to protrude backward in the initial state, and a belt body 511 provided at the base end of the belt body 511. A finger hooking portion 512 having a block shape in which a finger hanging recess portion 512a is arranged on the left side, and a left engaging rail 513 that is provided at an outer end portion of the finger hanging portion 512 and engages with the left side frame portion w3 in the back frame 31; And a left-side plate member support portion 514 that protrudes forward from the outer end portion of the finger hanging portion 512 and supports the plate member 4. The belt 51 is integrally formed of resin.

  The belt main body 511 is provided with engaging recesses 511a that are a plurality of engaged portions in the left-right direction on the back side of the tip portion on which the buckle 52 is disposed. In this embodiment, the engagement recesses 511a are provided at three locations, and the height of the engagement recesses 511a located on the most distal end side is fixed at a certain height to prevent the engagement recesses 511a from being pulled out from the buckle 52. An end edge wall 511b having the above is provided. The belt main body 511 is provided with a through hole 511c which is a finger hook portion through which fingers can be inserted in the middle portion in the left-right direction and the up-down direction. The through-hole 511c has a rectangular shape extending in the left-right direction, and in particular, functions when the buckle 52 and the belt 51 are operated in directions close to each other.

  The finger hanging part 512 has a shape protruding rearward from the belt main body 511, and includes a recessed part 512a that is recessed so that an operator's finger can be hung on the upper end part and the lower end part thereof. The recess 512a exhibits a function particularly when the buckle 52 and the belt 51 are operated in directions away from each other.

  The engagement rail 513 is a columnar column extending in the up-down direction and projecting so as to form an L shape in a plan view on the outer side of the finger hanging portion 512. The engagement rail 513 has a front surface 513a, a back surface 513b, an inner surface 513c, and an outer surface 513d that are engaged with the front frame member 31f and the rear frame member 31r.

  The plate member support portion 514 is for supporting the plate member 4, and is a rectangular plate-like protruding plate 514a protruding forward from the outer side of the finger hanging portion 512, and the upper and lower sides from the tip end portion of the protruding plate 514a. And a protruding shaft j. The shaft j is engaged with the shaft support portion 42 of the plate member 4.

  The buckle 52 has a buckle body 521 having a belt insertion hole 521a into which the front end portion of the belt 51 is inserted, and a buckle body 521 that is cantilevered on the buckle body 521. An operation arm 522 that is elastically deformable in the direction of contact and separation, a right engagement rail 523 that is provided at an outer end of the buckle body 521 and engages with a right side frame portion w4 of the back frame, and the buckle body And a right plate member support portion 524 that protrudes forward from the outer end portion of 521 and supports the plate member 4. The buckle 52 is integrally formed of resin.

  The buckle body 521 includes a buckle tip 521b having a belt insertion hole 521a into which the tip of the belt 51 is inserted, a buckle upper wall 521c extending outward from the upper end of the buckle tip 521b, A buckle lower wall portion 521d extending outward from a lower end portion of the buckle tip portion 521b, and a buckle outer wall portion 521e connecting the buckle upper wall portion 521c and the outer end portions of the buckle lower wall portion 521d are provided. .

  The buckle tip portion 521b projects a belt guide portion 521f, which contacts the front side of the belt body 511 and guides the belt body 511 to the belt insertion hole 521a, inwardly to a position in front of the belt insertion hole 521a. It is provided. The buckle upper wall portion 521c and the buckle lower wall portion 521d have a triangular shape formed so that the dimension in the front-rear direction gradually increases from the inside toward the outside. On the buckle upper wall portion 521c and the buckle lower wall portion 521d, projecting protruding pieces 521g and 521h to which the front side of the belt main body 511 can abut are projected inwardly from the respective front end edges.

  The buckle outer wall portion 521e has a shape in which an intermediate portion in the vertical direction on the rear end side is recessed, and has a shape in which a finger can easily access the operation arm 522. The buckle body 521 has reinforcing ribs rb projecting from the front-rear direction intermediate portion on the inner side surface of the buckle outer wall portion 521e to the front-rear direction intermediate portion on the inner side surface of the buckle upper wall portion 521c and the buckle lower wall portion 521d. ing.

  One end of the operation arm 522 is supported by the buckle body 521 in a cantilever state, and is configured to be able to rotate in the front-rear direction using elastic deformation of resin. Specifically, the inner end of the operation arm 522 is integrally connected to the buckle tip 521b. The operation arm 522 is disposed inside the buckle body 521 having a frame shape. The operation arm 522 includes an operation arm main body 522a on which an operator's finger is hung and an engagement convex portion 522b which is an engagement portion provided to project forward from the operation arm main body 522a. The engaging convex portion 522b is provided in a shape protruding forward on the free end side of the operation arm main body 522a, and appropriate portions are reinforced by ribs.

  The engagement rail 523 has a columnar shape extending in the vertical direction and protruding from the outer side of the buckle body 521 so as to form an L shape in plan view. The engagement rail 523 has a front surface 523a, a back surface 523b, an inner surface 523c, and an outer surface 523d that are engaged with the front frame member 31f and the rear frame member 31r.

  The plate member support portion 524 is for supporting the plate member 4, and is a rectangular plate-like protruding plate 524 a protruding forward from the outer side of the buckle body 521, and the upper and lower sides from the distal end portion of the protruding plate 524 a. And a protruding shaft j. The shaft j is engaged with the shaft support portion 42 of the plate member 4.

  Next, the deflection amount adjusting mechanism J will be described in detail.

  The bending amount adjusting mechanism J includes an engaging convex portion 522b provided on the buckle 52 and a plurality of engaging concave portions 511a provided on the belt 51 and spaced apart in the left-right direction. The bending amount adjusting mechanism J is configured such that the engagement convex portion 522b can be selectively engaged with any of the plurality of engagement concave portions 511a.

  In other words, the lumbar support S is provided with the deflection amount adjusting mechanism J that changes the receiving position of the receiving member 5 for receiving the stretched fabric 32 in the front-rear direction. The bending amount adjusting mechanism J is configured to be able to change the receiving position of the receiving member 5 that indirectly receives the tension fabric 32 via the plate member 4 in the front-rear direction by changing the degree of bending. The receiving member 5 adjusts the degree of bending (curving degree) of the receiving member 5 mainly composed of the belt 51 by the bending amount adjusting mechanism J, and the front position (F) and the front position (F ), The degree of bending can be changed between the rear position (R) having a larger degree of bending than that in the state in FIG. The receiving member 5 is set to be bent backward to a certain extent even at the front position (F). In the present embodiment, the engagement convex portion 522b provided on the operation arm 522 of the buckle 52 and the three engagement concave portions 511a arranged in a plurality on the front end side of the belt 51 are engaged with each other, thereby In addition to the front position (F) and the rear position (R), the degree of bending of the receiving member 5 is larger than the state at the front position (F) and smaller than the state at the rear position (F). The state at the intermediate position can be set.

  The lumbar support S described above is supported by the backrest 3 so as to be movable in the vertical direction. That is, the left and right engagement rails 513 and 523 in the lumbar support S are supported by the lumbar support support portions provided on the left and right side frame portions w3 and w4 of the backrest 3 so as to be slidable in the vertical direction. In this embodiment, since the left and right engagement rails 513 and 523 have a columnar shape extending in the vertical direction, the lumbar support S can be moved up and down stably while maintaining a horizontal posture. Since the plate member 4 is supported by the receiving member 5, if the operator slides the receiving member 5 in the vertical direction while holding a predetermined portion of the receiving member 5, the plate member 4 is moved in the vertical direction together with the receiving member 5. Move to slide.

  Next, the operation of the lumbar support S in the present embodiment will be described mainly with reference to FIGS.

  As shown in FIG. 10, the receiving member 5 of the lumbar support S is held at a certain degree of bending so as to protrude rearward even at the front position (F). In a state where the seated person P is not drowning in the tension fabric 32, the receiving member 5 is not positively pressed forward against the tension fabric 32.

  As shown in FIG. 10, as a result of the seated person P drowning in the tension fabric 32, when a backward load is applied to the tension fabric 32, the plate member 4 slidably supported by the receiving member 5 is moved. It will bend backwards through. At this time, the shaft support portion 42 of the plate member 4 moves relative to the plate member support portions 514 and 524 of the receiving member 5. Specifically, the shaft support portion 42 slides inward with respect to the plate member support portions 514 and 524. Thereafter, the plate member 4 is prevented from being bent backward by the receiving member 5 set at the front position (F) when the amount of backward deflection is relatively small. When the bending of the plate member 4 is blocked by the receiving member 5, the load to the rear of the seated person P is received by the receiving member 5, and a so-called lumbar support function that supports the waist of the seated person P is exhibited. It becomes.

  On the other hand, as shown in FIG. 9, the receiving member 5 of the lumbar support S is bent in a rearward position (R) so as to protrude rearward greatly compared to the front position (F). . As in the case where the receiving member 5 is in the front position (F), the receiving member 5 is positively pressed forward against the upholstery 32 in a state where the seated person P is not leaning on the upholstery 32. Not in a state.

  As shown in FIG. 9, as a result of the seated person P falling on the tension fabric 32, when a backward load is applied to the tension fabric 32, the plate member 4 slidably supported by the receiving member 5 is moved. It will bend backwards through. At this time, the shaft support portion 42 of the plate member 4 moves relative to the plate member support portions 514 and 524 of the receiving member 5. Specifically, the shaft support portion 42 slides relatively large inward with respect to the plate member support portions 514 and 524. Thereafter, the plate member 4 is prevented from being bent backward by the receiving member 5 set at the rear position (R) when the plate member 4 is largely bent backward compared to the case of the front position (F). Become. For example, when the plate member 4 does not bend until the plate member 4 is blocked by the receiving member 5 in the rear position (R) due to the tension of the tension fabric 32, the so-called lumbar support S supports the seated person's P waist. The lumbar support function will not work. As shown in an example shown in FIG. 9, the seat member P receives a load against the tension of the tension 32 and is bent until the plate member 4 is blocked by the receiving member 5 at the rear position (R). In this case, a so-called lumbar support function for supporting the lumbar portion of the seated person P by the lumbar support S can be achieved.

  As described above, the chair C according to the present embodiment is provided with the upholstery 32 as a back support member that is elastically bent in the thickness direction in accordance with the load from the seated person P inside the back frame 31. A backrest 3 and a lumbar support S provided on the backrest 3 are provided. The lumbar support S is disposed on the back side of the backrest 3 with both ends supported by the back frame 31, and the back side of the upholstery 32 is indirectly attached when the upholstery 32 is bent backward. And a receiving member 5 that suppresses the bending of the upholstery 32 and a bending amount adjusting mechanism J that changes the receiving position of the receiving member 5 in the front-rear direction. For this reason, in the chair C which has the lumbar support S, it becomes excellent in the freedom degree of the design for aiming at the simplification of the structure in the site | part relevant to the lumbar support S, or weight reduction. That is, unlike the conventional lumbar support, the lumbar support S of the present embodiment is configured such that the back surface of the stretched fabric 32 is indirectly received only when the receiving member 5 is deflected rearward and the stretched fabric 32 is bent. And the waist portion of the seated person P is supported. For this reason, in the expected state, it is possible to reduce the necessity of excessively treating a portion related to the lumbar support S in order to strengthen the scaffold.

  In addition, since the receiving member 5 is configured to indirectly receive the back surface of the stretched fabric 32 at the stage where the stretched fabric 32 is bent backward, the bending of the stretched fabric 32 is suppressed. In a state where it is not received, a state where it is bent backward to a certain extent is maintained. For this reason, it is possible to easily confirm the degree of supporting the waist by simply grasping the receiving member 5 by visual observation.

  The lumbar support S is disposed on the back side of the plate member 4 that is in contact with the back surface of the tension member 32 and can receive the back surface of the tension member 32 indirectly via the plate member 4. Since the receiving member 5 is provided, the waist part of the seated person P can be suitably supported. That is, since the receiving member 5 supports the waist of the seated person P via the plate member 4 that is bent backward when receiving the load of the seated person P, the so-called hitting strength is involved. It will be possible to exert an action of relaxing.

  Moreover, since the degree of strength for supporting the waist of the seated person P can be adjusted by the degree of bending of the plate member 4 to the rear, the degree of freedom in design for adjusting the support force for the waist is improved. To be.

  Since the plate member 4 has both end portions thereof supported on both end portions of the receiving member 5 so as to be rotatable and slidable in the left-right direction, the plate member 4 is suitably moved relative to the receiving member 5. To get. For this reason, even if the receiving member 5 changes its posture between the front position (F) and the rear position (F), appropriate bending can be realized.

  The back frame 31 is provided with left and right side frame portions w3 and w4, and the receiving member 5 supports the base end portion on the left side frame portion w3 which is one side frame portion and the distal end side. The belt 51 extended in the direction of the right side frame portion w4, which is the other side frame portion, and the base end portion are supported by the right side frame portion w4, which is the other side frame portion, and the front end side of the belt 51 is And a buckle 52 to be held. For this reason, the waist part of the seated person P can be suitably supported by the cooperation of the belt 51 and the buckle 52.

  The bending amount adjusting mechanism J includes an engagement convex portion 522b provided on the buckle 52 and a plurality of engagement concave portions 511a provided on the belt 51 and spaced apart in the left-right direction, and the engagement Since the convex portion 522b can be selectively engaged with any of the engaging concave portions 511a, the engagement position can be changed in a multi-stage manner, and the amount of flexure is adjusted appropriately. Will be able to.

  The buckle 52 is provided in a cantilevered state with a buckle body 521 having a belt insertion hole 521a into which the tip of the belt 51 is inserted, and a direction in which the free end side comes into contact with and separates from the belt 51. And an operation arm 522 that is elastically deformable. In addition, the engagement convex portion 522 b is provided on the free end side of the operation arm 522, and the plurality of engagement concave portions 511 a are provided in the belt 51. For this reason, the relative position between the belt 51 and the buckle 52 can be suitably changed by the operation of the buckle 52.

  The belt 51 includes a through-hole 511c as a finger-hanging portion for placing a finger, and the belt 51 is configured to be able to be operated in a direction in which both fingers are hooked on the through-hole 511c and the buckle 52, and both are brought together. ing. For this reason, adjustment of the amount of bending by cooperation of belt 51 and buckle 52 can be performed suitably.

  Since the lumbar support S is supported by the backrest 3 so as to be movable in the vertical direction, the waist can be appropriately supported according to the physique of the seated person P and the like.

  In this embodiment, since the backrest 3 is provided with the upholstery 32 as the back support member, the back of the seated person P can be suitably supported by utilizing the elastic deformation of the upholstery 32.

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

  In the above-described embodiment, the back support member is mainly composed of the tension fabric, but is not limited to this. As the back support member, in addition to the stretched fabric, a so-called resin mesh made of a hard resin or a net-like material, or a cushion material coated with a skin material can be considered.

  The receiving member is not limited to a belt and a buckle. In other words, the receiving member only needs to be able to adjust the degree of deflection of the receiving member, and may have various configurations. For example, it may be provided with two strip members. In this case, it is preferable that the outer ends of the two belt-like members are fixed to the back frame and the inner ends are engaged with each other by a predetermined method.

  The lumbar support only needs to have at least a receiving member, and may have no plate member.

  The lumbar support may not be configured to be movable up and down with respect to the backrest.

  The bending amount adjusting mechanism may be any mechanism provided with an engaging portion provided on one of the belt and the buckle and a plurality of engaged portions provided on the other side and spaced apart in the left-right direction. The present invention is not limited to the embodiment provided with the engagement recesses and the engagement projections as shown in this embodiment.

  Of course, an armrest may be appropriately attached to the seat or the support base, and a headrest or a hanger may be appropriately attached to the backrest.

  In the case where a through-hole through which a finger can be inserted is provided in the belt, various shapes and the like can be considered, and the belt is not limited to the above-described embodiment.

  In the above-described embodiment, the belt has a finger hanging portion for hanging fingers, and in a state where the engaging portion provided on one side of the belt or the buckle and the engaged portion provided on the other are not engaged, Although it is configured to be able to be operated in a direction in which both fingers are placed on the finger-holding portion and the buckle, and the both are close to each other, the present invention is not limited to such a configuration. In other words, in a state where the engaging portion and the engaged portion are engaged, it may be configured to be operable in a direction in which both the finger hooking portion and the buckle come together.

  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.

DESCRIPTION OF SYMBOLS 1 ... Leg 2 ... Seat 3 ... Backrest 4 ... Plate member 5 ... Receiving member 31 ... Back frame 32 ... Back support member (tension ground)
C ... Chair J ... Deflection adjustment mechanism S ... Lumber support

Claims (6)

A chair provided with a backrest in which a back support member that is elastically bent in the thickness direction according to a load from a seated person is disposed inside the back frame, and a lumbar support provided in the backrest,
The lumbar support is disposed on the back side of the backrest with both ends supported by the back frame, and the back surface of the back support member is received directly or indirectly when the back support member is bent backward. a receiving member to suppress the deflection of the back support member Te state, and are not provided with a deflection amount and adjusting mechanism for changing the position received by the receiving member in the longitudinal direction,
The back frame is provided with left and right side frame portions,
The receiving member supports a base end portion supported by one of the side frame portions and has a distal end extended in the direction of the other side frame portion, and a base end portion supported by the other side frame portion. It is equipped with a buckle that holds the tip side of the belt,
The bending amount adjusting mechanism includes an engaging portion provided on the buckle and a plurality of engaged portions provided on the belt and spaced apart in the left-right direction, and the engaging portion is provided on the covered portion. It can be selectively engaged with any of the engaging portions,
The buckle body is provided with a buckle body having a belt insertion hole into which the front end portion of the belt is inserted, and the buckle body is cantilevered, and the free end side can be elastically rotated in a direction in which the free end side comes into contact with and separates from the belt. manipulation, that an arm, together with the engaging portion is provided on the free end side of the operating arm, said belt, said plurality of chairs that have engaged portion is provided. A plate member that contacts the back surface of the back support member; and the receiving member that is disposed on the back side of the plate member and that can indirectly receive the back surface of the back support member via the plate member; The chair according to claim 1, comprising: The chair according to claim 2, wherein the plate member is mounted on the receiving member, and the unit member is configured to be detachable from the back frame mainly using the plate member and the receiving member. The chair according to claim 2 or 3, wherein the plate member has both end portions supported by both end portions of the receiving member. The belt is intended to with a finger hook for placing a finger, claim 1 and 2 respectively to the finger hooking portion and the buckle over the hand side of the fingers are operably configured in a direction Aiyoru both A chair according to 3 or 4 . The chair according to claim 1, 2, 3, 4 or 5, wherein the lumbar support is supported by the backrest so as to be movable in the vertical direction.

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