JP6916693B2 - Chair - Google Patents

Description

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

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

By the way, in the one shown in Patent Document 1, the bending ratio of the belt can be changed by adjusting the engagement position between the belt (51) and the buckle (52) constituting the receiving member (5). ing. In other words, in the one shown in Patent Document 1, the engagement position between the belt and the buckle can be changed to adjust the extrusion condition with respect to the waist of the seated person.

However, since the buckle is located at the side end, there is a concern that the bending center of the belt, which is the main body of the receiving member, tends to shift to the left and right, and the waist of the seated person cannot be supported in a well-balanced manner.

Japanese Unexamined Patent Publication No. 2016-30888

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chair capable of suitably adjusting the degree of pressure 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, wherein the backrest is arranged in front of the backrest base and the backrest base, and can support the lumbar region of the seated person from behind. A lumbar plate having a portion and an adjuster arranged 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 are provided, and the adjuster is an adjuster. It is provided with a base and an extrusion member provided on the adjuster base and capable of pressing the lumbar plate from behind. By sliding the adjuster in the vertical direction, the front-rear position of the extrusion member can be changed. The chair is configured so that the degree of pressure applied to the lumbar plate by the extruded member can be adjusted , and the extruded member is supported so as to be movable back and forth with respect to the adjuster base.

The invention according to claim 2 is the chair according to claim 1, wherein the backrest base is provided with a guide portion capable of guiding the extruded member in the front-rear direction as the adjuster slides in the vertical direction. ..

The invention according to claim 3 is configured such that the guide portion includes a guide surface set to be gradually positioned forward toward the upper side, and the extruded member can come into contact with the guide surface. The chair according to claim 2.

According to a fourth aspect of the invention, the guide portion, which has no recessed shape toward the rear, the extrusion least claimed part accommodating space may accommodate is formed section member 2 or It is the chair described in 3.

The invention according to claim 5 is the chair according to claim 1, 2, 3 or 4, wherein the lumbar plate is rotatably supported with respect to the backrest base.

Claims The invention according to claim 6, wherein the lumbar plate, according to claim 1, 2, 3, 4 or 5 chair wherein are arranged to form right and left pairs.

According to the seventh aspect of the present invention, the adjuster base is provided with operation units at both left and right ends thereof for the user to operate, and at least a part of these operation units is outside the backrest base. The chair according to claim 1, 2, 3, 4, 5 or 6, which is provided at a position protruding toward the direction.

As described above, according to the present invention, it is possible to provide a chair capable of suitably adjusting the degree of pressure on the waist of the seated person.

The perspective view which shows one Embodiment of this invention. Front view in the same embodiment. The right side view in the same embodiment. The perspective view in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. The perspective view in the same embodiment. Front view in the same embodiment. The right side view in the same embodiment. The plan view in the same embodiment. Bottom view in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. FIG. 8 is a cross-sectional view taken along line XX in FIG. FIG. 8 is a cross-sectional view taken along the line YY. FIG. 2 is a schematic end view of the ZZ line in FIG. The operation explanatory drawing in the same embodiment. The operation explanatory drawing in the same embodiment. The operation explanatory drawing in the same embodiment. The operation explanatory drawing in the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 22. For convenience of explanation, the ones after FIG. 7 are shown by omitting the upholstery M. Further, the Zhangji M has a structure in which the backrest base main body 1 and the like constituting the backrest base H are covered so that the backrest base main body 1 and the like are not visible from the outside. For convenience of explanation, the upholstery M is intentionally shown by coarse shading.

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

As shown in FIGS. A seat E having a lower portion attached to the seat support D, a back support F whose front end is rotatably supported by a support base C, and a backrest G attached to the rear end of the back support F are provided. It will be done. 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 tilt backward at a constant ratio.

<< Leg B >>
The leg B includes a plurality of leg blades b1 having casters b3 at the lower ends, and leg columns b2 standing up from a portion where the upper ends of the leg blades b1 gather.

<< Support base C >>
The support base C is mainly composed of a metal support base body (not shown) supported by the leg support b2. The support base portion C includes a support base cover c1 that covers the support base main body. The support base body is invisible from the outside when the support base cover c1 is attached.

<< Seating D >>
The seat D is arranged on the support base C. The front portion of the seat receiver D is rotatably and rotatably supported with respect to the support base portion C, and the rear portion is rotatably supported in the vicinity of the base end portion of the back support body F.

<< 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 that is arranged on the seat shell e1. The seat shell e1 is arranged on the upper side of the seat support D, and is configured to be slidable in a certain range in the front-rear direction with respect to the seat support D.

<< Back Support F >>
The back support F can support the backrest G so as to be able to move 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 body F is axially supported by the support base portion C.

<< Backrest G >>
The backrest G includes a backrest base H having a rigidity and a size capable of supporting the back of the seated person from behind, a lumbar support mechanism J provided on the backrest base H and capable of supporting the waist of the seated person, and a backrest. Except for the cap K, which is attached to the through holes 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 penetrates, the upper part of the backrest base H, and the left and right ends. It is provided with an upholstery M capable of covering substantially the entire lumbar support mechanism J.

The lumbar support mechanism J has a lumbar plate 3 that is rotatably supported in the front-rear direction with respect to the backrest base H, and an up-and-down position that is arranged behind the lumbar plate 3 and can adjust the front-rear position of the lumbar plate 3. It is mainly composed of an movable adjuster 4 and a cover member 5 which is attached to the left and right ends of the adjuster 4 and serves as an operation end of the user.

<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 surface portions 11 are formed at appropriate locations on the upper and lower parts in front view and appropriate locations on the upper and lower parts in rear view, and a backrest base main body. It is provided with a lower frame member 2 connected to the lower end portion of 1.

First, the backrest base main 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 and convex toward the front side in a side view so as to be able to favorably support the seated person. It has a substantially bent shape.

The backrest base main body 1 has through holes 13 provided on both the left and right sides in the front view, and a guide having a concave shape provided in pairs at a position closer to the center than the through holes 13 in the front view. The portions 14 and the groove 15 for maintaining the posture of the adjusters 4 provided in pairs at a position closer to the center than the guide portion 14 in the front view, and a position above the guide portion 14 in the front view. A bearing portion 16 which is a shaft support portion for rotatably supporting the lumbar plate 3 in the front-rear direction, a recessed portion 17 to which a plate member p provided on the upper portion on the back surface side and displaying a trademark or the like is attached, and a lower end. The arm portion mounting recess 18 provided on both the left and right sides of the portion and into which the arm portion 22 of the lower frame member 2 can be fitted, and the erection frame portion 23 of the lower frame member 2 provided in the middle portion in the left-right direction of the lower end portion. The fitting protrusion 231 is provided with a fitting recess (not shown) to which the fitting protrusion 231 can be fitted.

The through hole 13 penetrates in the left-right direction. The operation portion 42 of the adjuster 4 arranged 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 has an elongated hole shape that communicates in the left-right direction and extends in the vertical 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 main body 1. That is, the backrest base main body 1 is provided with a bent portion 12 bent in an abbreviated shape so as to form a convex toward the front side in the vertical intermediate portion in the side view. A peak point 121 is set at the foremost end of the bent portion 12. The through hole 13 is provided in a portion of the backrest base main body 1 that extends substantially linearly in a state of being tilted backward in a side view located above the peak point 121 of the bent portion 12 and avoiding the peak point 121. Has been done. By setting the arrangement 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 a vertical position (S) corresponding to the waist portion of the seated person on the backrest base main body 1. The guide portion 14 can guide the extruded member 43 provided in 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 corresponding to the lumbar plates 3 provided in pairs on the left and right.

The guide portion 14 includes a guide surface 141 that is set to be gradually positioned forward as it goes upward. In other words, the guide surface 141 is in a forward leaning posture even when facing a virtual plumb bob. The guide surface 141 is configured so that the rear end portion of the extrusion member 43 can come into contact with the guide surface 141.

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

The groove 15 can accommodate a protrusion 412 projecting from the back surface of the adjuster 4. The groove 15 has a shape extending in the vertical direction.

The bearing portion 16 can pivotally support the lumbar plate 3 by engaging with the shaft 321 which is a pivoting portion provided on the lumbar plate 3. In this embodiment, the bearing portion 16 is formed on the rib surface portion 11 of the backrest base main body 1. The bearing portion 16 can support a pair of shafts 321 projecting from the upper portion of the lumbar plate 3 in the left-right direction.

The recessed portion 17 is provided in the middle portion in the left-right direction and the vicinity of the upper end portion of the backrest base main body 1 in the rear view. The recessed portion 17 is formed to be horizontally elongated. The recessed portion 17 is provided with an engaging hole 171 to which the claw p1 provided on the plate member p can engage. The plate member p is capable of sandwiching the upholstery M covered with the backrest base main body 1 with respect to the backrest base main body 1.

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

Subsequently, 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 main body 1 and the back support body F. The lower frame member 2 includes a base portion 21 having a plate-shaped 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 erection frame portion 23 erected between the upper and lower intermediate portions of the left and right arm portions 22 is provided.

The arm portion 22 is configured such that the upper portion 221 projecting upward from the erection frame portion 23 fits into the arm portion mounting recess 18 provided on the back side at the lower end portion of the backrest base main body 1. There is.

The erection frame portion 23 includes a plurality of fitting protrusions 231 that can be fitted into a fitting recess that is formed at the lower end of the backrest base main body 1 and is opened downward (not shown). In this embodiment, the fitting protrusions 231 are erected at three places so as to be arranged in the lateral direction. The erection frame portion 23 is joined to the lower end portion of the backrest base body 1 by a screw v2 in a state where the fitting projection 231 is internally 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 open upward as a whole when viewed from the rear. An inner fitting portion 19 formed at a lower end portion on the back surface side of the backrest base main body 1 and having a convex downward shape can be fitted to the outer fitting portion 24.

<Lumber 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 arranged between the lumbar plate 3 having a plate-shaped portion 31 arranged in front of the backrest base main body 1 and capable of supporting the waist of the seated person from behind, and between the backrest base H and the lumbar plate 3. It includes an adjuster 4 that is arranged and slidably supported in the vertical direction with respect to the backrest base body 1, and a cover member 5 attached to the left and right ends of the adjuster 4. A part of the lumbar support mechanism J, that is, the left and right ends of the adjuster 4 penetrate the guide hole k1 formed in the cap K.

The lumbar plate 3 is rotatably supported with respect to the backrest base body 1. In this embodiment, lumbar plates 3 are arranged in pairs on the left and right. The lumbar plate 3 is for rotatably supporting the plate-shaped portion 31 having a substantially trapezoidal plate shape in front view and the plate-shaped portion 31 projecting diagonally upward and backward from the upper end portion of the plate-shaped portion 31. It is provided with a support portion 32 of the above.

The plate-shaped portion 31 is located on the front side of the adjuster 4 and on the rear side of the upholstery M that bears the backrest surface. The plate-shaped 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-shaped portion 31. The support portion 32 includes a shaft 321 projecting from the tip 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 rotatably supported with respect to the backrest base H. The axes of the plurality of axes 321 provided on the left and right lumbar plates 3 are set so as to coincide with each other on 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 vertically movable with respect to the backrest base body 1. That is, as shown in FIGS. 19 to 22, the adjuster 4 is configured to be slidable between the lower position (S) and the upper position (U) with respect to the backrest base main body 1.

The adjusters 4 are paired with an adjuster base 4b having operation portions 42 for the user to operate at both left and right ends, and left and right pairs provided in the middle portion in the left-right direction of the adjuster base 4b and capable of pressing the lumbar plate 3 from the rear. It includes an eggplant extrusion member 43. The adjuster base 4b and the extrusion member 43 are integrally formed of a synthetic resin.

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

The adjuster base main body 41 has a shape curved so as to be convex rearward in a plan view along the front surface of the backrest base main body 1. On the back surface of the adjuster base main body 41, a protrusion 412 that leans back and engages with the groove 15 of the base main body 1 is projected rearward at a position inside the arrangement space 411.

The operation unit 42 has a strip shape extending in the left-right direction. The end portion of the operation unit 42, that is, the left and right tip portions 421, passes 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 front view. It is set so that it can be located outside the hole k1. The tip portion 421 of the operation portion 42 is provided with a nut portion 422 to which the screw v can be screwed. 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 tip portion 421 of the operation portion 42 is internally fitted into the fitting hole 51 of the cover member 5, and the cover member 5 is attached to the tip portion 421 of the operation portion 42 by the screw v. By attaching the cover member 5 to the end of the operating portion 42, the adjuster 4 is configured so as not to come out of the cap K and the backrest base H.

The extruded member 43 has a shape in which the dimension in the front-rear direction gradually increases toward the lower end side in the side view. The extruded member 43 is a hollow block-shaped member having a substantially triangular shape when viewed from the side. The extruded 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 extrusion member 43 is arranged in the arrangement space 411 of the adjuster base main body 41, and the resin hinge portion h, which is a hinge portion interposed between the adjuster base main body 41 and the upper end portion of the extrusion member 43, is provided. It is supported so as to be movable back and forth with respect to the adjuster base 4b. In other words, the extrusion member 43 is suspended and supported with respect to the adjuster base main body 41 via the resin hinge portion h.

The extruded member 43 is configured such that the trailing edge 43e can come into contact with the guide surface 141 of the guide portion 14. Then, when the adjuster 4 is slid from the lower position (S) to the upper position (U), the extrusion member 43 is guided by the guide surface 141 of the guide portion 14 and gradually moves to the front side with respect to the adjuster base 4b. It has become possible.

The extrusion member 43 is provided with a groove portion 431 extending in the vertical direction in the middle portion in the left-right direction on the back surface side. A partition wall 142 provided in the guide portion 14 of the backrest base main body 1 is located in the groove portion 431 of the extrusion member 43.

The cover member 5 is attached to the left and right ends of the adjuster 4 and constitutes an operation end that can be grasped by the user. The cover member 5 includes a fitting hole 51 into which the tip portion 421 of the operating portion 42 is inserted, and a screw insertion hole 52 communicating with the fitting hole 51. The cover member 5 is screwed to the tip portion 421 of the operation portion 42 by using the screw v inserted into 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 is an extrusion member in cooperation with a guide portion 14 provided on the backrest base H by gripping the cover member 5 so as to be picked by the user and sliding the adjuster 4 in the vertical direction. The front-rear position of the 43 is changed so that the degree of pressing by the extrusion member 43 on the lumbar plate 3 can be adjusted.

<Cap K>
The cap K can be fitted into 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 upholstery M to the backrest base H, and also has a function of engaging with the adjuster 4 constituting the lumbar support mechanism J and holding the adjuster 4 in a predetermined vertical position. What you get.

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

The locking claws k2 are provided at the upper and lower ends at the inner end and the upper and lower intermediate portions at the inner end, respectively. The locking claw k2 can be locked to the 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 elongated annular shape provided at the outer end of the cap K along the guide hole k1. A gap sk in which the upholstery M can be arranged 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 operating portion 42, which is a portion near the end of the adjuster 4, is located in the guide hole k1 of the cap K extending in the vertical direction. Then, 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 operating portion 42 of the adjuster 4 located in the guide hole k1 can be slidably contacted with the inner peripheral surface of the guide hole k1.

The exposed portion of the cap K and the lower frame member 2 which is the exposed portion of the backrest base H that is not covered by the upholstery M are 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, it is possible to give the user the impression that the entire backrest base H has the same color based on the color of the cap K.

In this specification, "color" means a color recognized through human vision.

<Zhangji M>
As shown in FIGS. 1 to 6, the upholstery M covers at least a part of the backrest base H. The upholstery M can cover substantially the entire backrest base main body 1 constituting the upper part of the backrest base H. The upholstery M includes a upholstery main body m1 formed by sewing a cloth cloth into a bag shape having an open lower end portion, and a cushion (not shown) attached to the inner surface of the upholstery main body m1.

In the upholstery M, a side opening m11 capable of communicating the inside and the outside is provided at the left and right side edge portions facing the through hole 13 of the backrest base main body 1. Then, a part of the upholstery M, that is, the opening edge of the side opening m11 in the upholstery M is configured to be sandwiched between the through hole 13 of the backrest base H and the cap K.

The upper end portion on the back surface side of the upholstery M is fastened to the backrest base main body 1 by attaching the plate member p to the recessed portion 17. Further, the lower end edge of the upholstery M is configured to be sandwiched between the backrest base main body 1 and the lower frame member 2.

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

As shown in FIGS. 19 to 22, the adjuster 4 has a lower position (S) in which the operation unit 42 is located at the lowest position in the guide hole k1 of the cap K, and the operation unit 42 is the most in 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 with respect to the upper position (U) located above.

In the adjuster 4 at the lower position (S), the rear portion of the extrusion member 43 is located in the accommodation space sp of the guide portion 14. That is, when the adjuster 4 is in the lower position (S), the extrusion member 43 does not take a posture of projecting forward with respect to the adjuster base 4b, and the front surface of the adjuster base 4b and the front surface of the extrusion member 43 are substantially flush with each other. It is in the state of. When the extruded member 43 rotatably supported with respect to the adjuster base 4b via the resin hinge portion h is in the lower position (S), the extruded member 43 receives the load of the lumbar plate 3 and the upholstery M and rotates backward. It moves and the rear part is pushed into the guide part 14.

When the adjuster 4 is slid and moved toward the upper position (U) by the user's operation from the state where the adjuster 4 is in the lower position (S), the extrusion located in the accommodation space sp of the guide portion 14 is extruded. 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 center of rotation. In other words, the extruded member 43 supported so as to be movable back and forth with respect to the adjuster base 4b by the operator grasping the cover member 5 and sliding the adjuster 4 upward is the backrest base main body 1. Due to the guiding action (cam action) of the guiding surface 141 in the above, the posture is changed so as to protrude forward from the front surface of the adjuster base 4b.

As the adjuster 4 gradually slides upward, the extruded member 43 that has transitioned so that the degree of gradual protrusion toward the front side gradually increases the plate-shaped portion 31 of the lumbar plate 3 from the rear to the front side. Will be pushed out. As a result, the plate-shaped portion 31 of the lumbar plate 3 can press the waist portion of the seated person via the upholstery M. That is, the front-rear position of the lumbar plate 3 can be adjusted by sliding the adjuster 4 in the vertical direction. Therefore, with the lumbar support mechanism J in this embodiment, the degree of pressure on the waist of the seated person can be finely adjusted by operating the adjuster 4 in the vertical direction.

As described above, the chair A according to the present embodiment is provided with a backrest G. Then, the backrest G has a backrest base H, a lumbar plate 3 having a plate-like portion 31 arranged in front of the backrest base H and capable of supporting the waist of the seated person from behind, and a backrest base H and a lumbar. It is provided with an adjuster 4 arranged between the plate 3 and slidably supported in the vertical direction with respect to the backrest base H. The adjuster 4 includes an adjuster base 4b and an extrusion 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 front-rear position of the extrusion member 43 can be changed, and the degree of pressing of the extrusion member 43 against the lumbar plate 3 can be adjusted. Therefore, it is possible to provide a chair A capable of suitably adjusting the degree of pressure on the waist of the seated person. That is, by sliding the adjuster 4 in the vertical direction, the front-rear position of the extrusion member 43 can be changed, and the degree of pressure of the extrusion member 43 on the lumbar plate 3 can be adjusted. The degree of pressure on the waist can be preferably set. Since the adjuster 4 slides in the vertical direction, it can always press the back of the seated person in a well-balanced manner between the lower position (S) and the upper position (U).

The extruded member 43 is supported so as to be movable back and forth with respect to the adjuster base 4b. Therefore, the adjuster base 4b can stably move up and down with respect to the backrest base H, and since only the extrusion member 43 moves back and forth, it is possible to exert a desired action with a relatively small operating force. It has become.

The backrest base H includes a guide portion 14 capable of guiding the extrusion member 43 in the front-rear direction as the adjuster 4 slides in the up-down direction. Therefore, the extrusion member 43 can preferably operate in the front-rear direction.

The guide portion 14 includes a guide surface 141 that is set to be gradually positioned forward as it goes upward. The extrusion member 43 is configured to come into contact with the guide surface 141. Therefore, the guide surface 141 can preferably guide the extrusion member 43 in the front-rear direction.

The guide portion 14 has a shape that is recessed toward the rear. The guide portion 14 is formed with a storage space sp that can accommodate at least a part of the extrusion member 43. Therefore, it is possible to easily set a configuration in which the extrusion member 43 does not press the lumbar plate 3.

The lumbar plate 3 is rotatably supported with respect to the backrest base H. Therefore, the lumbar plate 3 can be preferably moved forward by being pressed by the extrusion member 43.

The lumbar plates 3 are arranged in pairs on the left and right. Therefore, the left and right sides of the lumbar region of the seated person can be suitably supported.

The adjuster base 4b is provided with an operation unit 42 for the user to operate at both left and right ends thereof. The operation unit 42 is provided at a position where it projects outward from the backrest base H. Therefore, the adjuster 4 can be operated more preferably by the user.

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

The backrest does not have to be provided with upholstery. For example, the lumbar plate may be able to come into direct contact with the seated person.

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

The upholstery does not have to be in the shape of a bag. For example, it may cover only the backrest base and the front side of the lumbar plate.

The guide portion is not limited to the one having a concave shape, and may be any guide portion as long as it can exert a cam action to guide the extruded member in the front-rear direction.

The guide portion may be provided with a guide surface that is set to be gradually 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 upholstery.

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-shaped part 4 ... Adjuster 4b ... Adjuster base 43 ... Extruded member

Claims (7)

A chair with a backrest
The backrest is between the backrest base, a lumbar plate having a plate-like portion arranged in front of the backrest base and capable of supporting the waist of the occupant from behind, and the backrest base and the lumbar plate. It is equipped with an adjuster that is slidably supported 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.
By sliding the adjuster in the vertical direction, the front-rear position of the extrusion member can be changed, and the degree of pressure of the extrusion member on the lumbar plate can be adjusted .
A chair in which the extruded member is supported so as to be movable back and forth with respect to the adjuster base. The chair according to claim 1, wherein the backrest base includes a guide portion capable of guiding the extruded member in the front-rear direction as the adjuster slides in the vertical direction. The chair according to claim 2 , wherein the guide portion includes a guide surface set to be gradually positioned forward as it goes upward, and the extruded member can come into contact with the guide surface. The chair according to claim 2 or 3 , wherein the guide portion has a shape recessed toward the rear, and a storage space capable of accommodating at least a part of the extruded member is formed. The chair according to claim 1, 2, 3 or 4, wherein the lumbar plate is rotatably supported with respect to the backrest base. The chair according to claim 1, 2, 3, 4 or 5, wherein the lumbar plates are arranged in pairs on the left and right sides. The adjuster base is provided with operation parts for the user to operate at both left and right ends thereof, and at least a part of these operation parts is provided at a position protruding outward from the backrest base. The chair according to claim 1, 2, 3, 4, 5 or 6.

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