JP2019037665A - Chair - Google Patents

Abstract

To provide a chair for favorably adjusting a pressure degree with respect to a lumber part of a seated person.SOLUTION: A backrest G of a chair A includes: a backrest base H; a lumber plate 3 arranged in front of the backrest base H and having plate-like portions 31 capable of supporting a lumber part of a seated person from behind; and an adjuster 4 arranged between the backrest base H and the lumber plate 3 and supported to be vertically slidable with respect to the backrest base H. When the adjuster 4 is vertically moved by sliding, front and rear positions of extrusion members 43 are changed so as to adjust a pressure degree with respect to the lumber plate 3.SELECTED DRAWING: Figure 12

Description

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

  Conventionally, various chairs having a lumbar support function capable of pressing and supporting a seated person's waist from behind have been known (see, for example, Patent Document 1).

  By the way, what was shown in patent document 1 can change the curvature of a belt by adjusting the engagement position of the belt (51) and buckle (52) which comprise a receiving member (5). ing. In other words, the one disclosed in Patent Document 1 can adjust the degree of push-out of the seated person by changing the engagement position between the belt and the buckle.

  However, since the position of the buckle is located at the side end, there is a concern that the center of curvature of the belt, which is the main body of the receiving member, is likely to be shifted to the left and right, and the seated person's waist cannot be supported in a balanced manner.

Japanese Unexamined Patent Publication No. 2016-30088

  The present invention has been made paying attention to the above situation, and it is an object of the present invention to provide a chair capable of suitably adjusting the degree of pressing on the waist of a seated person.

  That is, the present invention has the following configuration.

  The invention according to claim 1 is a chair provided with a backrest, the backrest being arranged in front of the backrest base and the backrest base, and capable of supporting a seated person's waist from behind. A lumbar plate having a portion, and an adjuster disposed between the backrest base and the lumbar plate and supported so as to be slidable in the vertical direction with respect to the backrest base. A base and an extrusion member provided on the adjuster base and capable of pressing the lumbar plate from the rear; by sliding the adjuster up and down, the front and rear positions of the extrusion member are changed; The chair is configured to be able to adjust the degree of pressing of the lumbar plate by the push member.

  The invention according to claim 2 is the chair according to claim 1, wherein the pushing member is supported so as to be movable back and forth with respect to the adjuster base.

  The chair according to claim 1 or 2, wherein the backrest base includes a guide portion that can guide the push-out member in the front-rear direction as the adjuster slides in the up-down direction. It is.

  The invention according to claim 4 is configured such that the guide portion includes a guide surface set so as to be gradually positioned forward as it goes upward, and the push-out member can contact the guide surface. The chair according to claim 3.

  According to a fifth aspect of the present invention, the guide portion has a shape recessed toward the rear, and an accommodating space capable of accommodating at least a part of the pushing member is formed. 4 is a chair.

  A sixth aspect of the present invention is the chair according to the first, second, third, fourth or fifth aspect, wherein the lumbar plate is rotatably supported with respect to the backrest base.

  A seventh aspect of the present invention is the chair according to the first, second, third, fourth, fifth or sixth aspect, wherein the lumbar plates are arranged in pairs on the left and right.

  According to an eighth aspect of the present invention, the adjuster base is provided with an operation unit for a user to operate at both right and left ends, and at least a part of the operation unit is located outside the backrest base. The chair according to claim 1, 2, 3, 4, 6, or 7, which is provided at a position protruding in the direction.

  As described above, according to the present invention, it is possible to provide a chair that can suitably adjust the degree of pressing on the waist of a seated person.

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. The backrest G has a backrest base H, a lumbar plate 3 having a plate-like portion 31 that is arranged in front of the backrest base H and can support the waist of the seated person from the rear, and the backrest base H and the lumbar. An adjuster 4 is provided between the plate 3 and the backrest base H so as to be slidable in the vertical direction. The adjuster 4 includes an adjuster base 4b and a push member 43 provided on the adjuster base 4b and capable of pressing the lumbar plate 3 from the rear. By sliding the adjuster 4 in the vertical direction, the longitudinal position of the pushing member 43 can be changed, and the degree of pressing the lumbar plate 3 by the pushing member 43 can be adjusted. For this reason, the chair A which can adjust suitably the press degree with respect to a seated person's waist | hip | lumbar part can be provided. That is, since the adjuster 4 is slid in the vertical direction, the front and rear positions of the pushing member 43 can be changed, and the degree of pressing of the pushing member 43 against the lumbar plate 3 can be adjusted. The degree of pressing against the lower back can be suitably set. Since the adjuster 4 slides in the vertical direction, the back of the seated person can be constantly pressed between the lower position (S) and the upper position (U).

  The pushing member 43 is supported so as to be movable back and forth with respect to the adjuster base 4b. For this reason, the adjuster base 4b can stably move up and down with respect to the backrest base H, and only the pushing member 43 moves back and forth, so that the desired action can be exerted with a relatively small operating force. It has become.

  The backrest base H includes a guide portion 14 that can guide the push-out member 43 in the front-rear direction as the adjuster 4 slides in the vertical direction. For this reason, the pushing member 43 can operate | move suitably in the front-back direction.

  The guide unit 14 includes a guide surface 141 that is set to gradually move forward as it goes upward. And it is comprised so that the extrusion member 43 can contact | abut to the guide surface 141. FIG. For this reason, the pushing member 43 can be suitably guided in the front-rear direction by the guide surface 141.

  The guide portion 14 has a shape recessed toward the rear. The guide portion 14 is formed with an accommodation space sp that can accommodate at least a part of the pushing member 43. For this reason, the structure which the extrusion member 43 does not press the lumbar plate 3 can also be set easily.

  The lumbar plate 3 is supported so as to be rotatable with respect to the backrest base H. For this reason, the lumbar plate 3 can be suitably moved forward by being pushed by the pushing member 43.

  Lumber plates 3 are arranged in pairs on the left and right. For this reason, the right and left sides of the waist of the seated person can be suitably supported.

  The adjuster base 4b is provided with an operation part 42 for the user to operate at both left and right ends thereof. And the operation part 42 is provided in the position which protrudes outward rather than the backrest base H. As shown in FIG. For this reason, the adjuster 4 can be suitably operated by the user.

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

  In the above-described embodiment, the push member has been described in which the front-rear position with respect to the adjuster base can be changed as the adjuster slides in the vertical direction. However, the push member is not limited to this. For example, the adjuster may be one in which the adjuster base and the extrusion member are integrally formed.

  The backrest does not have to be provided with a stretch. For example, the lumbar plate may be capable of directly contacting the seated person.

  The lumbar plate is not limited to a pair of left and right, and may be a single plate having a plate-like portion.

  The upholstery may not be in the form of a bag. For example, only the backrest base and the front side of the lumbar plate may be covered.

  The guide portion is not limited to a recessed shape, and any guide portion may be used as long as it can exhibit a cam action and guide the pushing member in the front-rear direction.

  The guide unit may include a guide surface that is set so as to gradually be positioned forward as it goes downward.

  The lumbar plate is not limited to one that is rotatably supported with respect to the backrest base. For example, the lumbar plate may be attached to the inner surface side of the tension fabric.

  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 3 ... Lumber plate 31 ... Plate-like part 4 ... Adjuster 4b ... Adjuster base 43 ... Extruded member

Claims (8)

A chair with a backrest,
The backrest includes a backrest base, a lumbar plate having a plate-like portion disposed in front of the backrest base and capable of supporting a seated person's waist from the rear, and between the backrest base and the lumbar plate. And an adjuster supported so as to be slidable in the vertical direction with respect to the backrest base,
The adjuster includes an adjuster base and an extrusion member provided on the adjuster base and capable of pressing the lumbar plate from the rear.
A chair configured to change the front-rear position of the push-out member by sliding the adjuster in the up-down direction, and to adjust the degree of pressing the lumbar plate by the push-out member. The chair according to claim 1, wherein the push member is supported so as to be movable back and forth with respect to the adjuster base. The chair according to claim 1 or 2, wherein the backrest base includes a guide portion that can guide the push-out member in the front-rear direction as the adjuster slides in the vertical direction. The chair according to claim 3, wherein the guide portion includes a guide surface set so as to gradually be positioned forward as it goes upward, and the pusher member can contact the guide surface. The chair according to claim 3 or 4, wherein the guide portion has a shape recessed toward the rear, and an accommodation space capable of accommodating at least a part of the pushing member is formed. The chair according to claim 1, 2, 3, 4 or 5, wherein the lumbar plate is rotatably supported with respect to the backrest base. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein the lumbar plates are arranged in pairs on the left and right. The adjuster base is provided with an operation part for a user to operate at both right and left ends, and at least a part of the operation part is provided at a position protruding outward from the backrest base. A chair according to claim 1, 2, 3, 4, 5, 6 or 7.

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