JP2019037666A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair having a lumbar support mechanism, in which the complexity of the structure for holding the upholstery on the backrest base is suppressed. A backrest G penetrates a backrest base H, a cap K that can be fitted into through holes 13 provided on both sides of the backrest base H, and a guide hole k1 formed in the cap K. It includes a lumbar support mechanism J and an upholstery M that covers the backrest base H. A part of the upholstery M is sandwiched between the through hole 13 of the backrest base H and the cap K. [Selection diagram] FIG. 5

Description

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

  Conventionally, through holes are formed in the left and right side surfaces of the backrest base, and caps are attached to these through holes (see, for example, Patent Document 1). A vertically long guide hole is formed in the cap, and an operation lever constituting the lumbar support mechanism can pass through the guide hole.

  By the way, the backrest base is often covered with a tension fabric. Conventional chairs have been held by a separate tension retaining structure that is independent of the cap described above, so that the tension does not move relative to the backrest base. In other words, the conventional chair has a problem that the structure is complicated as a whole because it is necessary to provide the tension holding means independent of the cap.

JP 2013-94595 A

  The present invention has been made paying attention to the above-described circumstances, and provides a chair having a lumbar support mechanism, in which the complexity of the structure for holding the upholstery on the backrest base is suppressed. There is.

  That is, the present invention has the following configuration.

  The invention according to claim 1 is a chair having a backrest, wherein the backrest is a backrest base, and a cap that can be fitted into through holes provided on both sides of the backrest base; The lumbar support mechanism which penetrates the guide hole formed in these caps, and the tension ground which covers the backrest base are provided, and a part of the tension ground includes the through-hole and the cap of the backrest base. It is a chair sandwiched between.

  The invention according to claim 2 is the chair according to claim 1, wherein the exposed portion of the cap and the exposed portion of the backrest base that are not covered by the upholstery are set to substantially the same color. .

  According to a third aspect of the present invention, an end portion of the constituent member constituting the lumbar support mechanism is located outward from the guide hole, and a cover member is provided at the end portion of the constituent member. It is the chair of Claim 1 or 2 with which it has mounted | worn.

  According to a fourth aspect of the present invention, a portion near the end of the constituent member constituting the lumbar support mechanism is located in the guide hole extending in the vertical direction, and the constituent member is provided on the backrest base. The adjuster can adjust the degree of pressure on the lumbar portion of the seated person by moving up and down, and the vicinity of the end of the adjuster is engaged with the guide hole so that the adjuster can be held at a predetermined position. It is a chair of Claim 1, 2, or 3 comprised by these.

  According to a fifth aspect of the present invention, the backrest base is provided with a bent portion bent in a substantially U shape so as to protrude toward the front side at an intermediate portion in the vertical direction in a side view. The chair according to claim 1, 2, 3 or 4, wherein the through hole is provided above a peak point set at the foremost end of the section.

  According to a sixth aspect of the present invention, the cap has a cylindrical shape with the guide hole communicating in the left-right direction, and has a locking portion that can be locked to the backrest base at the inner end and outward. The chair according to claim 1, 2, 3, 4 or 5, wherein the chair has a heel portion at an end.

  The invention according to claim 7 is the chair according to claim 6, wherein a gap in which the tension fabric can be arranged is formed between the flange portion and the opening edge of the through hole.

  As described above, according to the present invention, in the chair having the lumbar support mechanism, it is possible to provide a chair in which the complexity of the structure for holding the tensioned fabric on the backrest base is suppressed.

The perspective view which shows one Embodiment of this invention. The front view in the embodiment. The right view in the same embodiment. The perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The perspective view in the embodiment. The front view in the embodiment. The right view in the same embodiment. The top view in the embodiment. The bottom view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. XX sectional drawing in FIG. The YY sectional view taken on the line in FIG. FIG. 3 is a schematic end view taken along line ZZ in FIG. 2. Operation | movement explanatory drawing in the same embodiment. Operation | movement explanatory drawing in the same embodiment. Operation | movement explanatory drawing in the same embodiment. Operation | movement explanatory drawing in the same embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, the thing after FIG. 7 is abbreviate | omitting and showing the fabric M for convenience of explanation. Further, the tension fabric M has a structure in which the backrest base body 1 and the like constituting the backrest base H are covered so that the backrest base body 1 and the like are not visible from the outside, but in FIGS. For the convenience of explanation, the upholstery M is dared to be shown by rough shading.

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

  As shown in FIGS. 1 to 3, the chair A includes a leg B, a support base C attached to the upper end of the leg B so as to be horizontally pivotable, a seat D whose front is supported by the support base C, A seat E having a lower portion attached to the seat D, a back support F whose front end is rotatably supported by the support base C, and a backrest G attached to the rear end of the back support F Do it. The seat E and the backrest G are supported by the support base C and the back support F so as to perform a so-called synchro-rocking operation that can be tilted backward at a constant ratio.

<< Leg B >>
The leg B includes a plurality of leg blades b1 each having a caster b3 at the lower end, and a leg column b2 standing from a portion where the upper end portions of the leg blades b1 are gathered.

<< support base C >>
The support base C is mainly composed of a metal support base main body (not shown) supported by the leg support b2. The support base C includes a support base cover c1 that covers the support base main body. The support base body cannot be visually recognized from the outside in a state where the support base cover c1 is attached.

<< Seat D >>
The seat D is arranged on the support base C. The seat D is supported so that the front portion thereof can move back and forth and turn with respect to the support base C, and the rear portion thereof is supported in the vicinity of the base end portion of the back support F so as to be turnable.

<< Seat E >>
The seat E includes a seat shell e1 that plays a role as a structural member that receives the load of the seated person, and a seat cushion e2 disposed on the seat shell e1. The seat shell e1 is disposed on the upper side of the seat D, and is configured to be slidable within a certain range in the front-rear direction with respect to the seat D.

<< Back support F >>
The back support F can support the backrest G so as to be movable back and forth. The rear end portion of the back support F is connected to the lower end portion of the backrest G. The front end portion of the back support F is axially supported by the support base C.

<< Backrest G >>
The backrest G includes a backrest base H having rigidity and size capable of supporting the back of the seated person from the rear, a lumbar support mechanism J provided on the backrest base H and capable of supporting the waist of the seated person, and the backrest. Excluding the cap K, which is mounted in the through-hole 13 provided on the left and right sides of the base H and has a guide hole k through which a part of the lumbar support mechanism J passes, the upper part of the backrest base H, and the left and right ends And a tension fabric M capable of covering substantially the entire lumbar support mechanism J.

  The lumbar support mechanism J includes a lumbar plate 3 that is supported so as to be pivotable in the front-rear direction with respect to the backrest base H, and a vertical position that is arranged on the rear side of the lumbar plate 3 and that can adjust the front-rear position of the lumbar plate 3. The movable adjuster 4 is mainly composed of a movable adjuster 4 and a cover member 5 which is an operation end of a user attached to the left and right ends of the adjuster 4.

<Backrest base H>
The backrest base H has a substantially rectangular shape when viewed from the front. The backrest base H includes a backrest base body 1 in which rib exposed portions 11 are formed at appropriate locations in the upper and lower portions in the front view and upper and lower portions in the rear view, and the backrest base body. 1 and a lower frame member 2 connected to the lower end portion of 1.

  First, the backrest base body 1 constituting the backrest base H will be described.

  As a whole, the backrest base body 1 has a curved shape so as to be convex rearward in a plan view so as to favorably support a seated person, and is convex toward the front side in a side view. It has a generally bent shape.

  The backrest base body 1 has a through hole 13 provided on both left and right sides in a front view, and a recessed guide provided in a left-right pair at a position closer to the center than the through hole 13 in a front view. And a groove 15 for maintaining the posture of the adjuster 4 provided in a left-right pair at a position closer to the center part than the guide part 14 in a front view, and a position above the guide part 14 in a front view. A bearing portion 16 as a shaft support portion for supporting the lumbar plate 3 so as to be rotatable in the front-rear direction, a recessed portion 17 to which a plate member p provided on the back side and displaying a trademark or the like is attached, and a lower end Provided on the left and right side portions of the lower portion of the lower frame member 2 and the arm portion mounting recessed portion 18 in which the arm portion 22 of the lower frame member 2 can be fitted, and the installation frame portion 23 of the lower frame member 2 provided in the middle portion in the left and right direction Fitting And a fitting recess (not shown) projecting 231 is capable of fitting.

  The through hole 13 penetrates in the left-right direction. An operation portion 42 of an adjuster 4 disposed on the front side of the intermediate portion in the left-right direction of the backrest base main body 1 communicates with the through-hole 13. The through hole 13 communicates in the left-right direction and has a long hole shape extending in the up-down direction. A cap K can be fitted into the through hole 13.

  As shown in FIG. 9 and the like, the through hole 13 is provided above the peak point 121 set at the foremost end of the bent portion 12 of the backrest base body 1. That is, the backrest base body 1 includes a bent portion 12 that is bent in a generally U-shape so as to be convex toward the front side at an intermediate portion in the vertical direction in a side view. A peak point 121 is set at the foremost end of the bent portion 12. And the through-hole 13 is provided in the part extended in the substantially linear form in the state inclined backward in the side view located above it, avoiding the peak point 121 of the bending part 12 in the backrest base main body 1. It has been. By setting the location of the through hole 13 in this way, the adjuster 4 can be easily moved smoothly in the vertical direction.

  The guide portion 14 is provided at the vertical position (S) corresponding to the waist of the seated person in the backrest base body 1. The guide portion 14 can guide the push-out member 43 provided on the adjuster 4 in the front-rear direction as the adjuster 4 slides in the vertical direction. The guide portions 14 are provided in pairs on the left and right sides corresponding to the lumbar plates 3 provided in pairs on the left and right.

  The guide unit 14 includes a guide surface 141 that is set to gradually move forward as it goes upward. In other words, the guide surface 141 is inclined forward with respect to the virtual vertical surface. The guide surface 141 is configured so that the rear end portion of the pushing member 43 can come into contact therewith.

  The guide part 14 has a shape recessed toward the rear. The guide portion 14 is formed with an accommodating space sp that can accommodate at least a part of the pushing member 43, that is, a lower portion and a rear portion of the pushing member 43. A portion corresponding to a so-called bottom surface of the recessed guide portion 14 is a guide surface 141. The guide portion 14 is provided with a partition wall 142 for maintaining the posture of the pushing member 43 extending in the vertical direction at the middle portion in the left-right direction.

  The groove 15 can accommodate a protrusion 412 protruding from the back surface of the adjuster 4. The groove 15 extends in the vertical direction.

  The bearing portion 16 is capable of pivotally supporting the lumbar plate 3 by engaging with a shaft 321 that is a pivot portion provided on the lumbar plate 3. In this embodiment, the bearing portion 16 is formed in the rib exposed portion 11 of the backrest base body 1. The bearing portion 16 can support a pair of shafts 321 that protrude in the left-right direction on the upper portion of the lumbar plate 3.

  The recessed part 17 is provided in the left-right direction middle part and upper end vicinity of the backrest base main body 1 in back view. The recessed portion 17 is formed to be recessed horizontally. The recessed portion 17 is provided with an engagement hole 171 in which a claw p1 provided on the plate member p can be engaged. The plate member p is capable of sandwiching the tension fabric M covered with the backrest base body 1 with respect to the backrest base body 1.

  The arm mounting recesses 18 are formed on the left and right sides of the lower end of the backrest base body 1. The arm portion mounting recess 18 has a recess shape that opens downward, rearward, and outward. In addition, the through hole 13 is provided adjacently on the arm portion mounting recess 18 in a side view.

  Next, the lower frame member 2 constituting the backrest base H will be described.

  The lower frame member 2 constitutes the backrest base H. The lower frame member 2 is interposed between the backrest base body 1 and the back support F. The lower frame member 2 includes a base portion 21 having a plate-like portion located at the lower end portion and screwed to the back support F, and left and right arm portions 22 erected on the left and right sides of the base portion 21. The installation frame portion 23 is provided between the middle portions of the left and right arm portions 22 in the vertical direction.

  The arm portion 22 is configured such that an upper portion 221 protruding upward from the erection frame portion 23 is fitted into an arm portion mounting recess 18 provided on the back side of the lower end portion of the backrest base body 1. Yes.

  The erection frame portion 23 includes a plurality of fitting protrusions 231 that can be fitted into fitting recesses that are formed at the lower end of the backrest base body 1 and that open downward (not shown). In this embodiment, the fitting protrusions 231 are erected at three locations so as to be aligned in the lateral direction. The erection frame portion 23 is joined to the lower end portion of the backrest base body 1 by the screw v <b> 2 in a state where the fitting protrusion 231 is fitted in the fitting recess of the backrest base body 1.

  The lower frame member 2 includes an outer fitting portion 24 having a concave shape that is opened upward as a whole in a rear view. The outer fitting portion 24 can be fitted with an inner fitting portion 19 that protrudes downward and is formed at the lower end portion on the back side of the backrest base body 1.

<Lumbar support mechanism J>
The lumbar support mechanism J can support the seated person's waist by pressing it from behind. The lumbar support mechanism J is disposed between the backrest base H and the lumbar plate 3, and includes a lumbar plate 3 having a plate-like portion 31 arranged in front of the backrest base body 1 and capable of supporting the occupant's lower back from behind. The adjuster 4 is arranged and supported so as to be slidable in the vertical direction with respect to the backrest base body 1, and the cover member 5 is mounted on the left and right ends of the adjuster 4. A part of the lumbar support mechanism J, that is, the left and right end portions of the adjuster 4 pass through the guide hole k1 formed in the cap K.

  The lumbar plate 3 is supported so as to be rotatable with respect to the backrest base body 1. In this embodiment, the lumbar plates 3 are arranged in pairs on the left and right. The lumbar plate 3 has a plate-like portion 31 having a substantially trapezoidal plate shape when viewed from the front, and protrudes obliquely upward and rearward from the upper end portion of the plate-like portion 31 so as to rotatably support the plate-like portion 31. The support part 32 is provided.

  The plate-like portion 31 is located on the front side of the adjuster 4 and on the rear side of the tension fabric M that bears the backrest surface. The plate-like portion 31 has a rigidity that hardly bends even when it receives a load of a seated person.

  The support portion 32 is cantilevered with respect to the plate-like portion 31. The support portion 32 includes a shaft 321 that protrudes from the front end portion in the left-right direction. The shaft 321 is engaged with the bearing portion 16 of the backrest base body 1 so that the lumbar plate 3 is supported so as to be rotatable with respect to the backrest base H. The axes of the plurality of shafts 321 provided on the left and right lumbar plates 3 are set so as to coincide with the same virtual axis.

  The adjuster 4 has a form extending in the left-right direction as a whole. The adjuster 4 is configured to be movable up and down with respect to the backrest base body 1. That is, the adjuster 4 is configured to be slidable between the lower position (S) and the upper position (U) with respect to the backrest base body 1 as shown in FIGS.

  The adjuster 4 is provided with an adjuster base 4b having an operation portion 42 for a user to operate at both left and right ends, and a left and right pair provided on the middle portion in the left and right direction of the adjuster base 4b so as to press the lumbar plate 3 from the rear. And an extruding member 43 formed. The adjuster base 4b and the pushing member 43 are integrally formed of synthetic resin.

  The adjuster base 4b has a belt-like outer shape formed wider in the vertical direction than the operation portion 42, and an adjuster base main body 41 provided with disposition spaces 411 in which the pushing members 43 can be disposed on both the left and right sides in a front view. And an operating portion 42 that is set to have a shorter vertical width than the adjuster base body 41 and extends in the left-right direction from the left and right ends of the adjuster base body 41.

  The adjuster base body 41 has a curved shape so as to protrude rearward in plan view so as to follow the front surface of the backrest base body 1. On the back surface of the adjuster base body 41, a protrusion 412 that protrudes rearward and engages with the groove 15 of the backrest base body 1 at a position inside the installation space 411.

  The operation unit 42 has a strip shape extending in the left-right direction. The end of the operation unit 42, that is, the left and right tip portions 421 pass through the through hole 13 of the backrest base body 1 and the guide hole k1 of the cap K, and the side edge of the backrest base body 1 and the guide of the cap K in a front view. It is set so that it can be located outward from the hole k1. A nut portion 422 to which the screw v can be screwed is provided at the distal end portion 421 of the operation portion 42. A screw v that has passed through a screw insertion hole 52 formed in the lower surface side of the cover member 5 is screwed into the nut portion 422. That is, the distal end portion 421 of the operation portion 42 is fitted into the fitting hole 51 of the cover member 5, and the cover member 5 is attached to the distal end portion 421 of the operation portion 42 by the screw v. By attaching the cover member 5 to the end portion of the operation unit 42, the adjuster 4 is configured not to come out of the cap K and the backrest base H.

  The pushing member 43 has a shape in which the dimension in the front-rear direction gradually increases toward the lower end in a side view. The pushing member 43 is a hollow block having a substantially triangular shape in a side view. The push-out member 43 is supported by the adjuster base 4b via a thin resin hinge portion h whose upper end is a hinge portion. That is, the pushing member 43 is disposed in the arrangement space 411 of the adjuster base body 41, and a resin hinge portion h that is a hinge portion interposed between the adjuster base body 41 and the upper end portion of the pushing member 43 is provided. And is supported so as to be movable back and forth with respect to the adjuster base 4b. In other words, the pushing member 43 is supported by being suspended from the adjuster base body 41 through the resin hinge portion h.

  The pushing member 43 is configured such that the rear end edge 43e can come into contact with the guide surface 141 of the guide portion 14. When the adjuster 4 is slid from the lower position (S) to the upper position (U), the pusher member 43 is guided by the guide surface 141 of the guide portion 14 and gradually moves forward relative to the adjuster base 4b. It has come to be able to do.

  The pushing member 43 is provided with a groove portion 431 extending in the up-down direction in the middle portion on the back side in the left-right direction. In the groove portion 431 of the pushing member 43, a partition wall 142 provided in the guide portion 14 in the backrest base body 1 is positioned.

  The cover member 5 constitutes an operation end that is attached to the left and right ends of the adjuster 4 and can be gripped by the user. The cover member 5 includes a fitting hole 51 into which the distal end portion 421 of the operation unit 42 is inserted, and a screw insertion hole 52 that communicates with the fitting hole 51. The cover member 5 is screwed to the distal end portion 421 of the operation portion 42 using a screw v inserted through the screw insertion hole 52. The cover member 5 can exhibit a retaining function for preventing the tip portion 421 of the adjuster 4 from coming out of the cap K and the backrest base H.

  The lumbar support mechanism J described above cooperates with the guide portion 14 provided on the backrest base H by gripping the user so that the user grips the cover member 5 and sliding the adjuster 4 in the vertical direction. The front-rear position of 43 is changed, and the pressing degree to the lumbar plate 3 by the pushing member 43 can be adjusted.

<Cap K>
The cap K can be fitted into the through holes 13 provided on both sides of the backrest base H. The cap K can exert a function of fixing a part of the tension fabric M to the backrest base H, and engages with the adjuster 4 constituting the lumbar support mechanism J, and functions to hold the adjuster 4 at a predetermined vertical position. To get.

  The cap K has a cylindrical shape having a guide hole k1 having a long hole shape extending in the vertical direction communicating with the horizontal direction. The cap K includes a locking claw k2 that is a locking portion that is provided at the inner end and can be locked to the backrest base H, and a collar k3 that is provided at the outer end.

  The locking claw k <b> 2 is provided in the vertical direction at the inner end and the intermediate portion in the vertical direction at the inner end. The locking claw k2 can be locked to a through-hole forming wall 131 which is a locking portion provided in the through-hole 13 in the backrest base H.

  The collar portion k3 is a vertically long ring provided at the outer end of the cap K along the guide hole k1. A gap sk in which the tension fabric M can be disposed is formed between the collar portion k3 and the opening edge of the through hole 13 in the backrest base H.

  In this embodiment, a part of the operation part 42 which is the vicinity of the end of the adjuster 4 is located in the guide hole k1 of the cap K extending in the vertical direction. A part of the operation unit 42 is engaged with the guide hole k1 so that the adjuster 4 can be held at a predetermined vertical position. More specifically, a part of the operation portion 42 of the adjuster 4 located in the guide hole k1 can come into sliding contact with the inner peripheral surface of the guide hole k1.

  The lower frame member 2 that is an exposed portion of the cap K and an exposed portion of the backrest base H that is not covered with the tension fabric M is set to have substantially the same color. With this configuration, it is not necessary to set the backrest base body 1 to the same color as the lower frame member 2. In other words, based on the color of the cap K, the user can make an impression that the entire backrest base H has the same color.

  In this specification, “color” refers to a color recognized through human vision.

<Zhangji M>
The upholstery M covers at least a part of the backrest base H as shown in FIGS. The upholstery M can cover substantially the entire backrest base body 1 constituting the upper portion of the backrest base H. The upholstery M includes a upholstery main body m1 formed by sewing a cloth material into a bag shape having an open lower end, and a cushion (not shown) attached to the inner surface of the upholstery main body m1.

  In the upholstery M, the left and right side edge portions facing the through-hole 13 of the backrest base body 1 are provided with side openings m11 that allow communication between the inside and the outside. A part of the tension fabric M, that is, an opening edge of the side opening m11 in the tension fabric M is configured to be sandwiched between the through hole 13 of the backrest base H and the cap K.

  The upper end of the back side of the tension fabric M is fixed to the backrest base body 1 by attaching the plate member p to the recessed portion 17. Further, the lower end edge of the stretch fabric M is configured to be sandwiched between the backrest base body 1 and the lower frame member 2.

  Next, the operation of the lumbar support mechanism J in this embodiment will be described.

  19 to 22, the adjuster 4 has a lower position (S) where the operation portion 42 is located at the lowest position in the guide hole k1 of the cap K, and the operation portion 42 is the most within the guide hole k1 of the cap K. It is supported so as to be slidable in the vertical direction with respect to the backrest base H between the upper position (U) positioned above.

  The adjuster 4 is such that the rear portion of the pushing member 43 is located in the accommodation space sp of the guide portion 14 at the lower position (S). That is, when the adjuster 4 is in the lower position (S), the pushing member 43 does not take a posture of protruding forward with respect to the adjuster base 4b, and the front surface of the adjuster base 4b and the front surface of the pushing member 43 are substantially flush. The state is made. When the push-out member 43 supported rotatably with respect to the adjuster base 4b via the resin hinge portion h is in the lower position (S), it receives the load of the lumbar plate 3 and the tension M and rotates backward. The rear part is moved into the guide part 14.

  When the adjuster 4 is slid in the upward position (U) direction by the user's operation from the state where the adjuster 4 is in the lower position (S), the extrusion that has been positioned in the accommodation space sp of the guide portion 14 is performed. The member 43 is guided by the guide surface 141 and is gradually pushed out toward the front side with the resin hinge portion h as the rotation center. In other words, when the operator holds the cover member 5 and slides the adjuster 4 upward, the pusher member 43 supported so as to be movable back and forth with respect to the adjuster base 4b is supported by the backrest base body 1. Due to the guide action (cam action) of the guide surface 141 in FIG. 8, the posture shifts forward from the front face of the adjuster base 4b.

  As the adjuster 4 gradually slides upward, the pushing member 43 that has shifted so as to gradually protrude toward the front side gradually moves the plate-like portion 31 of the lumbar plate 3 from the rear side toward the front side. Will be pushed out. As a result, the plate-like portion 31 of the lumbar plate 3 can press the seated person's waist through the tension M. That is, the lumbar plate 3 can be adjusted in its front-rear position by sliding the adjuster 4 in the vertical direction. Therefore, with the lumbar support mechanism J in this embodiment, the degree of pressing against the waist of the seated person can be finely adjusted by the vertical operation on the adjuster 4.

  As described above, the chair A according to this embodiment includes the backrest G. A lumbar support mechanism in which the backrest G passes through the backrest base H, a cap K that can be fitted into the through holes 13 provided on the left and right sides of the backrest base H, and a guide hole k1 formed in the cap K. J and the upholstery M covering the backrest base H. A part of the tension fabric M, that is, a side opening m11 provided in the tension fabric M is sandwiched between the through hole 13 of the backrest base H and the cap K. For this reason, in the chair A having the lumbar support mechanism J, it is possible to provide a configuration in which complication of the structure for holding the tension fabric M on the backrest base H is suppressed. That is, the cap K can not only exhibit the guide function of the lumbar support mechanism J, but can also exhibit the function for holding the tensioned fabric M on the backrest base H. Since the cap K has two functions, the design flexibility for avoiding the complicated structure of the backrest G is excellent.

  The collar part k3 and the guide hole k1 which are the exposed part in the cap K, and the lower frame member 2 which is the exposed part which is not covered by the tension fabric M in the backrest base H are set to substantially the same color. Therefore, no matter what color the member constituting the backrest base H covered with the upholstery M (that is, the backrest base main body 1) is, the backrest can be provided to the user or the like. It is possible to give an impression as if the entire base H is a common color.

  A tip portion 421 of the adjuster 4 that is an end portion of a constituent member constituting the lumbar support mechanism J is located outside the guide hole k1 of the cap K, and a cover is provided on the tip portion 421 of the adjuster 4. A member 5 is attached. For this reason, the cover member 5 is not only suitable for the operation end of the lumbar support mechanism J, but can also suitably exhibit the function of preventing the leading end portion 421 of the adjuster 4 from coming off.

  A portion in the vicinity of the tip portion 421 of the adjuster 4 constituting the lumbar support mechanism J is located in a guide hole k1 extending in the vertical direction of the cap K. The adjuster 4 plays a role of adjusting the degree of pressing on the waist of the seated person by moving up and down with respect to the backrest base H. The adjuster 4 is configured such that the vicinity of the tip portion 421 is in sliding contact with the inner peripheral surface of the guide hole k1 so that the adjuster 4 can be held at a predetermined position. For this reason, the adjuster 4 is engaged with the cap K and can be held at a desired vertical position.

  The backrest base H is provided with a bent portion 12 bent in a generally U shape so as to protrude toward the front side at an intermediate portion in the vertical direction in a side view. And the through-hole 13 is provided above the peak point 121 set to the foremost end in the bending part 12. FIG. For this reason, the cap K and the guide hole k1 can be set as linearly as possible, and the smooth movement of the adjuster 4 constituting the lumbar support mechanism J can be easily realized.

  The cap K has a cylindrical shape having a guide hole k1 communicating in the left-right direction, and has a locking claw k2 that is a locking portion that can be locked to the backrest base H at the inner end and a collar at the outer end. k3. For this reason, the cap K can be suitably locked to the backrest base H by the locking claw k2, and the cap K can have a suitable appearance exposed by the collar k3.

  A gap sk in which the stretch fabric M can be disposed is formed between the flange portion k3 of the cap K and the opening edge of the through hole 13 of the backrest base H. For this reason, between the cap K and the backrest base H, the upholstery M can be arranged without difficulty.

  As shown in FIG. 18, the gap sk on the front side of the cap K is configured to be larger than the gap sk on the rear side of the cap K. A cushion (not shown) provided on the front side of the tension fabric M is used. This is because the thickness of the film is taken into consideration.

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

  Various structures and shapes of the backrest can be adopted, and the backrest structure and shape are not limited to those described above.

  Various cap structures and shapes can be employed, and the cap structure is not limited to that described above. For example, a cap or a guide hole provided in the cap may be long in the front-rear direction.

  The configuration of the lumbar support mechanism may be any configuration as long as it can press and adjust the waist portion of the seated person.

  The upholstery may not be in the form of a bag.

  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.

A ... Chair G ... Backrest H ... Backrest base J ... Lumber support mechanism K ... Cap k1 ... Guide hole

Claims (7)

A chair with a backrest,
The backrest includes a backrest base, a cap that can be fitted into through holes provided on both sides of the backrest base, a lumbar support mechanism that penetrates guide holes formed in the caps, and the backrest. With a stretch fabric covering the base,
A chair in which a part of the upholstery is sandwiched between the through hole of the backrest base and the cap. The chair according to claim 1, wherein an exposed portion of the cap and an exposed portion of the backrest base that are not covered by the upholstery are set to substantially the same color. The end of the constituent member constituting the lumbar support mechanism is located outside the guide hole,
The chair according to claim 1 or 2, wherein a cover member is attached to an end of the component member. The portion near the end of the constituent member constituting the lumbar support mechanism is located in the guide hole extending in the vertical direction,
The component is an adjuster that can adjust the degree of pressing on the waist of the seated person by moving up and down with respect to the backrest base,
The chair according to claim 1, 2, or 3, wherein a portion near the end of the adjuster is engaged with the guide hole so that the adjuster can be held at a predetermined position. The backrest base is provided with a bent portion bent in a substantially U shape so as to protrude toward the front side at the intermediate portion in the vertical direction in a side view, and the peak set at the foremost end of the bent portion The chair according to claim 1, 2, 3 or 4, wherein the through hole is provided above a point. The cap has a cylindrical shape with the guide hole communicating in the left-right direction, and has a locking portion that can be locked to the backrest base at the inner end and a flange at the outer end. The chair according to claim 1, 2, 3, 4 or 5. The chair according to claim 6, wherein a gap in which the upholstery can be arranged is formed between the flange and the opening edge of the through hole.

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