JP2003010000A - Backrest device with lumbar-supporting function for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backrest device with a lumbar-supporting function which shows better fit performance to the hips of a seated person. SOLUTION: Each supporting axis 32 is secured to right and left lifting bodies 36 attached to a back supporting frame 6a ascendably and descendably. A pendulum-type pressing body 34 is attached to the supporting shaft 32, and the amount of protrusion of a pressing body 34 can be adjusted by changing the amount of forward rotation of the pressing body 34. The supporting shaft 32 is connected integrally by a connecting body 33 extending horizontally at the outside of a back cover 14. Pressing and pulling the connecting body 33 vertically with a hand allows adjustments of the pressing body 34 depending on the seated height of the seated person.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest device with a lumbar support function in a chair.

[0002]

2. Description of the Related Art A backrest device provided with a lumbar support has been proposed so that a person sitting on a chair can maintain a correct posture without burdening the spinal cord.

[0003] This lumbar support is for pushing the contact portion of the back plate between the lumbar vertebra and the spine of a seated person from the rear, and the back plate is made of an elastically deformable material such as synthetic resin. , The back plate is pushed from the rear by the lumbar support to bend and deform.

In addition, the lumbar support is adjustable in height so that it is possible to cope with a difference in height (more accurately, sitting height) of a user.

[0005]

In the conventional lumbar support, only the left and right central portions of the backrest plate are pushed, or the backrest plate is supported over the entire width.

However, in the case of pushing only the right and left central portions of the backrest plate, the deformation of the backrest plate may be too rapid, resulting in a lack of fit. On the other hand, a back plate that extends over the entire width of the right and left has a low function of deforming the back plate, and there is a possibility that the back plate may lack fit.

The present invention aims to improve the present situation.

[0008]

In order to solve the above-mentioned problems, the structure of each claim is adopted. Of these, the invention of claim 1 is provided with a backrest plate capable of flexibly deforming at least a portion corresponding to a person's waist, and behind the backrest plate, portions on both sides of the backrest plate sandwiching the longitudinal center line are in front. The left and right pressing bodies that are pushed to the side are attached so that the height can be adjusted.

According to a second aspect of the present invention, in the first aspect, the backrest plate is attached to a back support mechanism arranged behind the backrest plate, and the pressing body is attached to the back support mechanism in a height-adjustable manner. ing.

According to a third aspect of the present invention, in the second aspect, the left and right pressing bodies are connected to a connecting body (handle) located behind the backrest plate so that they can move up and down together. Is exposed to the outside so that a person can grab it by hand and move it up and down.

The invention of claim 4 is the invention of claim 2 or claim 3.
In the above, the left and right pressing bodies are attached to the back support mechanism in a state in which the amount of forward projection can be adjusted.

[0012]

As described above, when the backrest plate is pushed by the pressing members on both sides of the longitudinal centerline as in the present invention, the waist of the seated person is supported from both the left and right sides through the backrest plate. Therefore, the body pressure of the person on the backrest plate can be dispersed.

By distributing the body pressure of the person in this way, it is possible to accurately support the waist while reducing the burden on the person, and the backrest plate can be deformed between the left and right pressing bodies. By doing so, it is possible to improve the fit to the waist of a person, and in combination with these, for a person who is seated,
It is possible to give a comfortable sitting comfort while accurately supporting the lower back.

According to the third aspect of the present invention, the left and right pressing bodies can be moved up and down at the same time simply by holding the connecting portion and pushing and pulling it up and down. Therefore, the pressing bodies can be moved according to the height of the user. This is an advantage that the height can be adjusted with one touch.

Further, the connecting body can be used for other purposes such as hanging articles such as jackets and umbrellas, or as a handle when moving a chair. , Something useful.

By the way, human skeletons and body shapes are various,
The front and back of the back and waist are various. In this respect, claim 4
With such a configuration, since the protruding position of the pressing body can be adjusted according to the difference in the physique or skeleton of the user, there is an advantage that the difference in the physique or skeleton of the user can be appropriately dealt with.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. INDUSTRIAL APPLICABILITY The present invention is applied to a synchro type chair in which a seat body is tilted backward in conjunction with a backrest. FIG. 1 is a right side view of the chair and FIG. 2 is a front view.

.. Outline As shown in FIGS. 1 and 2, the chair includes a leg having a pedestal (gas cylinder) 1, a seat receiving body 2 fixed to an upper end of the pedestal 1, and a seat receiving body 2 above the seat receiving body 2. The arranged intermediate support 3, the seat 4 attached to the intermediate support 3, and the backrest 5
And a pair of left and right back support frames (back columns) 6.

The front part of the seat body 4 and the front part of the intermediate support body 3 are connected by a first support shaft 7 which is long in the left and right direction, and the front end part of the back support frame 6 and the seat receiving body 2 are in the left and right direction. The second support shaft 8 connects the back support frame 6 and the seat body 4 to each other at a portion rearward of the second support shaft 8 by a third support shaft 9 extending in the left-right direction.

The respective members are connected to each other via shafts 7, 8 and 9 so as to be rotatable relative to each other, and the seat body 4 to which the first support shaft 7 is fitted.
By making the hole of the slanted hole 10 from the side view, the first
The support shaft 7 is used as a slide shaft. For this reason, the backrest 5
When the back tilts, the intermediate support body 3 and the seat body 4 move toward the backrest 5
It moves backward while leaning backward at a rate smaller than the rate of backward leaning.

The backrest 5 has a structure in which a cushion 12 is stretched over the front surface of a backrest plate (back inner member) 11 made of synthetic resin, and a back support mechanism 13 extends behind the backrest plate 12. The back support mechanism 13 includes a pair of left and right upper portions 6a of the back support frame (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.

A back cover 15 is arranged behind the back plate 14. It is fixed to the back plate 15 by a locking means such as hooking of a claw.

.. Backrest Next, details of the backrest device will be described with reference to the drawings starting from FIG. 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. Sectional view, FIG. 6 is a sectional view taken along line VI-VI of FIG. 3, and FIG. 7 is VII-V of FIG.
II is a sectional view as seen from FIG. 8, FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 3, and FIGS. 9 and 10 are sectional views taken along line IX-IX of FIGS. 3 and 7.

As shown in FIGS. 6 and 7, the upper portion of the back support frame 6a is in the shape of a pipe having a rectangular cross section. On the other hand,
The back plate 14 is made of synthetic resin, and as shown in FIG. 4, the upper end of the back support frame 6a is fixed to the bracket portion 17 formed on the upper front surface of the back plate 14 with the screw 18.

The upper and lower middle portions of the back support frame 6a are connected by a reinforcing member 19, and the reinforcing member 19 is fixed to the back plate 14 via a bracket piece.

The backrest plate 11 is made of a synthetic resin such as PP. As shown in FIG. 5, a pair of left and right downward hooks 20 are formed on the upper portion of the backrest plate 11, and the downward hooks 20 are connected to the bracket portion 17 of the back plate 14. It is fitted into the engaging hole 21 formed from above from above.

An upper hook-shaped lower locking claw 22 is formed at the lower end of the backrest plate 11, and the lower locking claw 22 is formed.
Is deformed against the elasticity of the back support frame 6
It is engaged with the reinforcing member 19 a from below. In this case, the lower locking claw 22 is set to be movable in the front-rear direction. This is to allow the lower portion of the backrest plate 11 to move forward according to the physique of the person.

As shown in FIGS. 3 and 4, on the front surface of the upper portion of the back plate 14, there are arranged cylindrical portions 23 which are open vertically and are separated from each other as appropriate. This is for attaching a replenishment member 24 such as an upper backrest or a headrest, and a foot 25 provided on the replenishment member 24.
Fits into the tubular portion 23.

.. Lifting Mechanism As shown in FIGS. 3 and 6 to 8, for example, a U-shaped lifting body 26 is vertically movably fitted to the back support frame 7. The left and right elevating bodies 26 are integrally connected by a connecting plate 27, and synthetic resin sliders 28 are fitted into the left and right elevating bodies 26.

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 which overlaps with the upper portion of the back support frame 6a, while a slider 28 of the lifting body 26 is provided. Forms a movable rack 30 that meshes with the fixed rack 29.

The racks 29, 30 are set so that the racks 29, 30 are kept in an engaged state in a normal state, and are disengaged by elastic deformation when a certain amount of force is applied to the elevating body 26. When the seated person leans against the backrest 5, the racks 29 and 30 are in close contact with each other so as to mesh with each other.

.. A support shaft 32 extending outward in the left-right direction is fixed to the front surface of the upper end portion of the pressing body left-right elevating body 26 by welding or the like, and a connecting body extending horizontally behind the back cover 15 is attached to the support shaft 32 ( The left and right ends of the handle 33 are integrally fixed. Therefore, as shown in FIG. 8, when the connecting body 33 is grasped and pushed up and down with a certain amount of force or more, the elevating body 26 can be moved up and down.

A pressing body 34 is provided at the base of the support shaft 32.
The upper end of is penetrated. As shown in FIG. 3, the pressing body 3
A window hole 35 that is open at the front and back is open in the middle of the upper and lower portions of 4. Further, as shown in FIG. 9, the lower end of the pressing body 34 abuts on the rear surface of the backrest plate 11.

Left and right brackets 36 projecting rearward are integrally formed at a position of the window hole 35 of the pressing body 34, and a cam 38 is relatively rotated with respect to an operation shaft 37 rotatably penetrating the bracket 36. It is fixed to be impossible. The operating shaft 37 penetrates the end of the connecting body 33 with some play, and a knob 37a is attached to the outside.

On the outer peripheral surface of the cam 38, a plurality (five) of cam surfaces 38a having different distances from the axial center of the operating shaft 37 are formed, and it is set so that an arbitrary cam surface contacts the support plate 39. ing.

For example, as shown in FIG. 5, a backrest plate 11
A large number of slits 40 that extend in a substantially horizontal shape are formed at portions of the left and right ends of the pressing body 34 that are abutted against the pressing body 34.
For this reason, the backrest plate 11 is easily made to have a forward convex shape in a side view on both left and right sides thereof.

.. In the above configuration, the height position of the pressing body 34 can be adjusted to the waist height of the seated person by manually moving the connecting body 33 up and down. The height of the pressing body 34 can be adjusted by getting out of the chair, or by putting a hand on both left and right sides of the connecting body 33 while sitting down.

By rotating the operating shaft 37 while seated, the pressing body 34 is rotated as shown in FIGS. 9 to 10.
Can be rotated. This makes the back plate 1
The forward protrusion amount of 1 can be adjusted according to the physique, skeleton, etc. of the seated person.

In this case, the pressing body 3 of the backrest plate 11
Since the slits 40 are provided in a multi-step manner at the portion where the pressing body 4 hits, even if the pressing body 34 is changed to an arbitrary height, the pressing body 34
It can be deformed into a forward convex shape in a side view so that the portion hitting by the projecting portion largely projects. Therefore, the backrest plate 11 can be fitted to the waist of people of various heights and physiques.

Instead of forming the pressing body 34 as an integral structure, as shown in FIG.
A roller 42 may be rotatably provided as a pressing body on the first unit. With this configuration, the pressing body 34 can be lifted and lowered more smoothly.

When the left and right ends of the connecting body 33 are positioned below the support shaft 37 as in the embodiment, there is an advantage that a person can easily perform the lifting operation while sitting down.

.. 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 connecting body around the support shaft. In this case, a rotary system in which the cam returns to the original state when the connected body is rotated several times in one direction makes the operation simple and easy to use.

The back support frame is not limited to the square pipe shape,
It is also possible to use round pipes or flat plates. The pressing body can also be made of various structures such as a rubber type or an air bag type.

The weakening means for facilitating the deformation of the backrest plate is not limited to the slit as in the embodiment, and a thin portion or a cutting line may be formed. The adjusting means for adjusting the amount of forward movement of the pressing body is not limited to using the cam as in the embodiment, and may be a screw using a wedge body or the like.

[Brief description of drawings]

FIG. 1 is a front view of a chair according to the present 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.

[FIG. 5] (A) is a partial front view of the backrest plate, (B) is (A)
FIG.

6 is a sectional view taken along line VI-VI of FIG.

7A is a sectional view taken along line VII-VII of FIG. 3, and FIG. 7B is a partial sectional view of a modified example.

8 is a sectional view taken along line VIII-VIII of FIG.

9 (A) is a sectional view taken along line IXA-IXA of FIGS. 3 and 7, and (B) is shown.
[Fig. 3] is a diagram showing movement of a pressing body.

FIG. 10 is a diagram showing a movement of a 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 spindles 33 Connected body (handle) 37 Operation axis 40 slits

Claims (4)

[Claims] 1. A backrest plate, at least a portion of which is in contact with a person's waist, can be flexibly deformed. Behind this backrest plate, both sides of the backrest plate sandwiching a longitudinal center line are pushed to the front side. A backrest device with a lumbar support function in a chair, in which the left and right pressing bodies are attached so that their height can be adjusted. 2. The chair according to claim 1, wherein the backrest plate is attached to a back support mechanism arranged behind the backrest plate, and the pressing body is attached to the back support mechanism in a height-adjustable manner. Backrest device with lumbar support function. 3. The left and right pressing bodies are connected to a connecting body (handle) located behind the backrest plate so that they can move up and down together. It is exposed to the outside so that it can be caused.
Backrest device with lumbar support function in the chair described in. 4. The left and right pressing bodies are provided on the back support mechanism.
The backrest device with a lumbar support function in the chair according to claim 2 or 3, wherein the backrest device is mounted so that the amount of forward protrusion can be adjusted.