JP4021162B2 - Chair with lumbar support function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair-out with La members support function.
[0002]
[Prior art]
Oite in a chair, so that a person who sat can hold the correct attitude that the burden is not applied to the spine,
A backrest device provided with a lumbar support has been proposed.
[0003]
The lumbar support is for pressing the contact of a seated occupant waist vertebra of the back plate from the back, to produce the backrest board of an elastically deformable material such as synthetic resin, the rear backrest plate with lumbar support It is designed to be bent and deformed by pushing from above.
[0004]
In addition, by making the lumbar support adjustable in height, it is possible to cope with differences in the height (exactly sitting height) of the user.
[0005]
[Problems to be solved by the invention]
Conventional lumbar support are either pressed only left-right center portion of the backrest plate, or supporting the backrest board over the entire width.
[0006]
However, in the case of pushing only the left and right center portions of the backrest plate, there is a possibility that the deformation of the backrest plate becomes too rapid and lacks fit. On the other hand, those extending over the entire left and right width of the backrest plate have a low function of deforming the backrest plate, and there is a possibility that the backrest plate lacks fit.
[0007]
An object of the present invention is to improve such a current situation.
[0008]
[Means for Solving the Problems]
The present invention, "a supported seat body pedestals, and a backrest plate which can moiety bending deformation which corresponds to the waist of the person who least seated behind the backrest board, Vertical among the backrest plate The left and right pressing bodies that push the portions of the hips of the seated person to the near side on both sides of the cord are arranged so that the height can be adjusted , and the back plate and the back side of the pressing body Is provided with a back cover, while the left and right pressing bodies are attached to the handle so as to move up and down together.
[0009]
And in invention of Claim 1, the said handle | steering-wheel has the part extended horizontally in the back side of the said back cover, and the right-and-left end part to which the press body was connected with the both right-and-left both ends. The back cover is surrounded by a handle from the back side and both the left and right sides, and a person is allowed to move the handle up and down while sitting, and the left and right ends of the handle are pressed bodies. And extending downward from the connecting portion.
[0010]
According to a second aspect of the present invention, in the first aspect, an elevating body is disposed between the backrest plate and the back cover so as to be movable up and down, and the left and right pressing bodies are centered on the upper portion of the elevating body. The pressing body is attached to the support shaft so as to rotate back and forth, and the lower portion of the pressing body is in contact with the backrest plate, and a plurality of cam surfaces with different distances from the rotation axis are formed on the outer periphery. The rotation posture can be switched by a cam.
[0011]
The invention of claim 3, Oite to claim 2, wherein the pressing member is comprised of a roller provided on the arm and its lower end which rotates about the upper end portion.
[0012]
[Operation and effect of the invention]
As in the present invention, pressing the pressing member in the both sides of the backrest plate a longitudinal center line, to become a state in which the waist of the seated person via a backrest plate is supported from the left and right sides, the human body against the backrest plate The pressure can be dispersed.
[0013]
By dispersing the body pressure of the person in this way, it is possible to accurately support the waist in a state where the burden on the person is reduced, and the backrest plate can be deformed between the left and right pressing bodies, It is possible to improve the fit of the person to the waist, and together, it is possible to give a comfortable sitting comfort to the seated person while accurately supporting the waist.
[0014]
And since the left and right pressing bodies can be moved up and down at the same time simply by placing the hand on the handle and pushing up and down, the height of the pressing body can be adjusted with one touch according to the height of the user. Is an advantage.
[0015]
Moreover, since the connection body has a portion extending horizontally on the back side of the back cover, it can be used to hang articles such as a jacket or an umbrella, or used as a handle for moving a chair. It can be used for other purposes.
[0016]
By the way, the human skeleton and body shape are various, and the back and forth relationship between the back and the waist is also various. In this regard, if configured as in claim 2 , the protruding position of the pressing body can be adjusted according to the difference in the user's physique and skeleton, and therefore, there is an advantage that the difference in the user's physique and skeleton can be accurately handled.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. The present invention is applied to a synchro-type chair in which the seat body tilts backward in conjunction with the backrest. FIG. 1 is a right side view of the chair, and FIG. 2 is a front view.
[0018]
(1). As shown in outline these FIGS. 1 and 2, chair pedestal and leg having a (gas cylinder) 1, a seat receiving member 2 fixed to the upper end of the pillar 1, the seat receiving body 2, an intermediate support 3 disposed above 2, a seat 4 attached to the intermediate support 3, a backrest 5, and a pair of left and right back support frames (back struts) 6.
[0019]
The front portion of the seat body 4 and the front portion of the intermediate support 3 are connected by a first support shaft 7 that is long in the left-right direction, and the front end portion of the back support frame 6 and the seat support body 2 are in a second support that is long in the left-right direction. The back support frame 6 and the seat body 4 are connected by a left and right long third support shaft 9 at a portion rearward of the second support shaft 8.
[0020]
Each member is connected through shafts 7, 8, and 9 so as to be relatively rotatable, and the hole of the seat body 4 in which the first support shaft 7 is fitted is a long hole 10 that is inclined in a rear view. Thus, the first support shaft 7 is used as a slide shaft. For this reason, when the backrest 5 tilts backward, the intermediate support 3 and the seat body 4 move backward while tilting backward at a rate smaller than the backward tilting rate of the backrest 5.
[0021]
The backrest 5 has a structure in which a cushion 12 is stretched on the front surface of a synthetic resin backrest plate (back inner member) 11, and a back support mechanism 13 extends behind the backrest plate 11 . The back support mechanism 13 includes an upper portion 6a of a pair of left and right back support frames (hereinafter, the upper portion of the back support frame is simply referred to as “back support frame 6a”) and a back plate 14 fixed to the back support frame 6a. It is configured.
[0022]
A back cover 15 is disposed behind (back side) the back plate 14. The back cover 15 is fixed to the back plate 14 by a locking means such as hooking a claw.
[0023]
(2). Backrest Next, the details of the backrest device will be described with reference to FIG. 3 and subsequent drawings. 3 is a front view with the backrest 5 omitted, FIG. 4 is a partial perspective view, FIG. 5A is a partial front view of the backrest plate 5, and FIG. 3B is a BB of FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 3, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIGS. 3 and 7.
[0024]
As shown in FIGS. 6 and 7, the upper portion of the back support frame 6a is in the form of a pipe having a square cross section. On the other hand, the back plate 14 is made of synthetic resin, and as clearly shown in FIG. 4, the upper end portion of the back support frame 6 a is fixed to the bracket portion 17 formed on the upper front surface of the back plate 14 with screws 18.
[0025]
The middle part of the back support frame 6a is connected by a reinforcing member 19, and the reinforcing member 19 is fixed to the back plate 14 via a bracket piece.
[0026]
The backrest plate 11 is made of a synthetic resin such as PP, and as shown in FIG. 5, a pair of left and right downward flanges 20 are formed on the upper part thereof, and the downward flanges 20 are formed on the bracket portion 17 of the back plate 14. It engages with the locking hole 21 from above.
[0027]
Further, an upward hook-like lower locking claw 22 is formed at the lower end of the backrest plate 11, and the lower locking claw 22 is deformed against its elasticity to reinforce the reinforcing member of the back support frame 6a. 19 is engaged from below. In this case, it is set so that the lower locking claw 22 can move in the front-rear direction. This is to allow the lower part of the backrest plate 11 to move forward according to the physique of the person.
[0028]
As shown in FIGS. 3 and 4, on the upper front surface of the back plate 14, a cylindrical portion 23 that is opened up and down is arranged at an appropriate distance from the left and right. This is for attaching an additional member 24 such as an upper backrest or a headrest, and a foot 25 provided on the additional member 24 is fitted into the cylindrical portion 23.
[0029]
(3) Elevating mechanism As shown in FIGS. 3 and 6 to 8, for example, a U-shaped elevating body 26 is fitted to the back support frame 6a so as to be movable up and down. The left and right lifting bodies 26 are integrally connected by a connecting plate 27, and a synthetic resin slider 28 is fitted in the left and right lifting bodies 26.
[0030]
As shown in FIGS. 7 and 8, a fixed-side rack 29 is integrally formed on a portion of the front surface of the back plate 14 that overlaps with the upper portion of the back support frame 6a. A movable rack 30 that meshes with the side rack 29 is formed.
[0031]
Both racks 29 and 30 are set so that the engaged state is maintained in a normal state and the engagement is released by elastic deformation when a certain amount of force is applied to the elevating body 26. In addition, when the seated person leans against the backrest 5, both racks 29 and 30 adhere so that it may mutually mesh.
[0032]
(4) Press body A support shaft 32 extending outward in the left and right directions is fixed to the front surface of the upper end portion of the left and right lifting body 26 by welding or the like, and a handle 33 is fixed to the support shaft 32 . That is, the handle 33 has a portion 33 a that horizontally extends behind the back cover 15 (back side) , and left and right end portions 33 b that are continuous at both ends, and a support shaft is provided on the left and right end portions 33 b of the handle 33. It is fixed together. Therefore, the back cover 15 is surrounded by the handle 33 from the back side and the left and right sides. In addition, as shown in FIG. 8, when the handle 33 is grasped and pushed up and down with a certain level of force, the elevating body 26 can be moved up and down.
The left and right end portions 33b of the handle 33 extend upward from the left and right ends of the horizontally extending portion 33a, and the support shaft 32 is located above the left and right ends of the horizontally extending portion 33a of the handle 33. It is fixed to.
[0033]
The upper end portion of the pressing body 34 passes through the base portion of the support shaft 32. As shown in FIG. 3, a window hole 35 opened in the front-rear direction is vacant in the middle part of the pressing body 34. Further, as shown in FIG. 9, the pressing member 34 has its lower end 34a is hitting the rear surface of the backrest board 11.
[0034]
The left and right brackets 36 projecting rearward are integrally formed at the position of the window hole 35 of the pressing body 34, and the cam 38 is fixed to the operation shaft 37 penetrating the bracket 36 so as to be relatively non-rotatable. is doing. The operation shaft 37 penetrates the end portion of the handle 33 with some play, and a knob 37a is attached to the outside.
[0035]
A plurality of (five) cam surfaces 38 a having different distances from the axis of the operation shaft 37 are formed on the outer peripheral surface of the cam 38, and an arbitrary cam surface is set so as to contact the support plate 39.
[0036]
For example, as shown in FIG. 5, a large number of slits 40 extending substantially horizontally are formed in the backrest plate 11 near the left and right ends where the lower end 34 a of the pressing body 34 abuts. For this reason, the backrest plate 11 is easily deformed into a forwardly convex shape in the left and right side portions in a side view.
[0037]
(5) Summary In the above configuration, the height position of the pressing body 34 can be adjusted to the height of the seated person's waist by moving the handle 33 up and down by hand. Height adjustment of the pressing member 34, to be this both carried down from the chair, can also be performed by applying a hand on the right and left side portions of the handle 33 while seated.
[0038]
Further, by rotating the operation shaft 37 while seated, the pressing body 34 can be rotated as shown in FIGS. Thereby, the amount of forward protrusion of the backrest plate 11 can be adjusted according to the physique or skeleton of the person who is seated.
[0039]
In this case, since the slits 40 are provided in multiple stages in the portion of the backrest plate 11 where the pressing body 34 hits, even if the pressing body 34 is changed to an arbitrary height , the pressing body 34 hits the backrest plate 11. It can be deformed into a convex shape facing forward so that the portion that protrudes protrudes greatly. For this reason, the backrest board 11 can be fitted to the waist of people of various heights and physiques.
[0040]
Instead of the pressing body and integral structure 34, as shown in FIG. 7 (B), as the pressing portion downward of the rotating type arm 41 roller 42 may be rotatably provided with configure. If it does in this way, raising / lowering of the press body 34 can be performed more smoothly.
[0041]
Since the right and left end portions of the portion 33a extending horizontally out of the handle 33 is positioned below the supporting shaft 32, there is likely to advantage performed lifting operations in a state a person is sitting.
[0042]
(6). Others The present invention can be embodied in various ways. For example, the forward protrusion adjustment of the pressing body may be performed by rotating the handle around the support shaft. In this case, when the cam and several times turning the handle in one direction to the rotary system, such as return to its original state, the operation use without permission is good and easy.
[0043]
Back support frame is not limited to the square pipe shape, Ru possible der be like a flat plate made or is made of round pipe.
[0044]
The weakening means for facilitating deformation of the backrest plate is not limited to the slit as in the embodiment, and a thin portion or a cut line may be formed. The adjusting means for adjusting the advancement amount of the pressing member is not limited to using a cam such as the embodiment may be such or use screws Ri using the wedge member.
[Brief description of the drawings]
FIG. 1 is a front view of a chair according to an embodiment.
FIG. 2 is a right side view of the chair.
FIG. 3 is a front view of the backrest device with the backrest omitted.
FIG. 4 is a partial perspective view.
5A is a partial front view of a backrest plate, and FIG. 5B is a cross-sectional view taken along the line BB of FIG. 5A.
6 is a cross-sectional view taken along the line VI-VI in FIG. 3;
7A is a cross-sectional view taken along the line VII-VII in FIG. 3, and FIG. 7B is a partial cross-sectional view of a modification.
8 is a cross-sectional view taken along the line VIII-VIII in FIG.
9A is a cross-sectional view taken along the line IXA-IXA in FIGS. 3 and 7, and FIG. 9B is a diagram illustrating the movement of the pressing body.
FIG. 10 is a diagram illustrating the movement of the pressing body.
[Explanation of symbols]
5 backrest 6 back support frame 11 back plate 13 back support mechanism 14 back plate 15 back cover 26 lifting body 32 support shaft 33 c command Le
34 Pressing body 37 Operating shaft 40 Slit

Claims (3)

A seat body supported by a pedestal, and a backrest plate which can moiety bending deformation which corresponds to the waist of the person who least seated behind the backrest board, across the longitudinal center line of the backrest board The left and right pressing bodies that push the portion of the height position of the seated person's waist on both sides are arranged so that the height can be adjusted, and a back cover is provided on the back side of the backrest plate and the pressing body. While the left and right pressing bodies are attached to the handle so as to move up and down together,
A movable chair called
The handle has a horizontally extending portion on the back side of the back cover and left and right end portions that are continuous with the left and right ends and to which a pressing body is connected. Therefore, the back cover is separated from the back side by the handle. It is enclosed from both the left and right sides, and it is possible to operate the handle up and down while sitting down.
Furthermore, the left and right end portions of the handle extend downward from the connecting portion with the pressing body,
Chair with lumbar support function. An elevating body is disposed between the backrest plate and the back cover so as to be movable up and down. The pressing body has a lower portion that abuts against a backrest plate, and a rotating posture can be switched by a cam having a plurality of cam surfaces with different distances from the rotation axis on the outer periphery. Yes,
The chair with a lumbar support function according to claim 1. The pressing body is composed of an arm that rotates around the upper end and a roller provided at the lower end.
A chair with a lumbar support function according to claim 2.

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