JPH0611546U - Backrest device in chair - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a comfortable and comfortable chair that supports a person's waist appropriately when leaning backward. [Structure] A backrest 3 is separately formed into a main backrest 4 and a sub-backrest 5, and these main backrest 4 and sub-backrest 5 are
The springs 14 are associated with each other so that the rear seat 5 is tilted backward by an appropriate angle at the same time, and that when the vehicle is tilted backward by a certain angle, the rear tilting of the auxiliary backrest 5 is stopped. Since the auxiliary backrest 5 does not excessively press the waist of the person, the fit is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a backrest device in a chair.

[0002]

[Prior art]

 When a person seated on a chair leans against the backrest, the waist does not move much and the back moves a large amount to the back.Therefore, there is a gap between the lower part of the backrest and the waist of the person, and There was a problem that the shirt was pulled upward and the fit was reduced.

Therefore, it has been practiced that a person sitting on a chair has the backrest fitted to the waist while the upper body is tilted backward, and as an example thereof, Japanese Utility Model Publication No. Sho 63-10765 is disclosed as a prior art. The backrest is formed so that it bends in a side view centering on the mid-height part, and when a person leans on the upper part of the backrest, the bending part projects forward and the bending part of the backrest is formed. A device designed to support a person's waist is described in.

[0004]

[Problems to be solved by the device]

 However, in this prior art, when a person leans against the backrest, the backrest immediately begins to bend, so that the bent portion of the backrest tends to excessively project in a forward convex shape, giving a feeling of pressure to the waist of the person. There was a problem that there were cases. Further, each time the backrest bends, a vertical pulling force is generated on the cushion body and the surface sheet covering the cushion body, so that there is a problem that the durability of the cushion body and the surface sheet is low.

An object of the present invention is to provide a backrest device that solves these problems.

[0006]

[Means for Solving the Problems]

 To achieve this object, the present invention separates the backrest standing upright from the back of the seat into a main backrest that mainly supports the back of a person and an auxiliary backrest that supports the waist of the person. The main backrest is attached to the seat body or the seat receiving body so as to tilt rearwardly against elasticity, while the main backrest and the auxiliary backrest are integrally tilted rearwardly with respect to the main backrest and the auxiliary backrest. In order to obtain the auxiliary backrest against the spring means, the auxiliary backrest is supported against the seat body or the seat support body while the main backrest is tilted rearward by an appropriate angle. The supporting member is provided.

[0007]

[Operation and effect of the device]

 In this configuration, when a person seated on a chair tilts the upper body backwards and the main backrest tilts backwards, the sub-backrest and the main backrest are tilted backwards integrally, and when both are tilted backward by a certain angle, the sub-backrests are supported. After that, the tilting is stopped, and only the main backrest tilts backward while separating from the sub-backrest against the elastic force of the spring means.

Then, when a person leaning against the backrest raises his / her upper body, the auxiliary backrest and the main backrest approach each other by the spring means, and the original state is restored. However, since the sub back and the main back are separated, the sub back does not rotate significantly with the tilting of the main back, so that the sub back does not rotate backward. Is held almost as it is, and the fact that the auxiliary backrest leans backward together with the main backrest to a certain extent, which prevents the auxiliary backrest from excessively pressing the person's waist.

Therefore, according to the present invention, it is possible to support the back and the lumbar region when the body is tilted backward without excessively pressing the lumbar region of the person. Therefore, when the body is leaned against the backrest, It has the effect of improving the fit and providing a comfortable sitting feeling. Further, since the main backrest and the sub-back are separated from each other, when a cushion body is stretched over the main back and the sub-back, when the main back is tilted backward with the sub-back stopped, the main back and the sub-back are stopped. The vertical tension does not act on the cushion body of the sub-back and the surface sheet covering it, and therefore the durability of the backrest can be improved.

[0010]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show the first embodiment. In these drawings, reference numeral 1 denotes a seat body supported by a leg body 2, and reference numeral 3 denotes a backrest standing upright from the seat body 1, respectively. The backrest 3 is divided into a main backrest 4 that mainly supports a person's back and a sub-backrest 5 that supports a person's waist, and a downward recess 4a is formed in the lower part of the main backrest 4. Then, the sub-backrest 5 is arranged in the recess 4a.

The main backrest 4 and the sub-backrest 5 respectively include substrates 4a, 5a and cushion bodies 4b, 5b stretched over the substrates 4a, 5a. At the upper end of the leg body 2, a seat receiving body 6 having a U-shaped cross section is fitted, and as shown in FIG. 6, the seat receiving body 6 is horizontally attached to the left and right side plates 6a, 6a, respectively. The support plate 6b is integrally connected, and the seat 1 is fixed to the horizontal support plate 6b.

Further, a tilting member 7 having a downward U-shaped cross section is arranged between the left and right side plates 6a, 6a of the seat receiving body 6, and the horizontal supporting shaft 8 is used to mount the tilting member 7 on the left and right side plates 6a of the seat receiving body 6. , 6a, and a pair of right and left backrest support rods 9 and 9 made of a square pipe formed in a substantially L shape in a side view are fixed to the tilting member 7, and the backrest support rods 9 and 9 are supported on the upper and lower backrests. The main backrest 4 is fixed with screws 10.

Further, one end of the gas cylinder 12 is rotatably locked to a horizontal support pin 11 mounted between the tips of the left and right side plates 7a, 7a of the tilting member 7 so that the main backrest 4 Can be tilted backward against the elasticity of the gas cylinder 12. Bolts 13 extending through the backrest support rods 9 and 9 are respectively screwed to the left and right ends of the substrate 5a of the sub-backrest 5, while springs are provided in the hollow portions of the left and right backrest support rods 9 and 9. As an example of the means, a leaf spring 14 having a trapezoidal shape in a side view opened toward the front of the chair is arranged, the bolt 13 is passed through the proximal end portion of the leaf spring 14, and a nut 15 is attached to the tip of the bolt 13. The main backrest 4 and the sub-backrest 5 can be separated from each other in the front-rear direction of the chair against the elasticity of the leaf springs 14 by screwing.

Square holes 16 for inserting the leaf springs 14 are formed in the rear surfaces of the left and right backrest support rods 9, 9. Then, a supporting member 17 having a substantially L-shape in a side view, which extends toward the back surface of the auxiliary backrest 5, is fixed to the lower surface of the rear portion of the seat body 1, and an appropriate space is provided between the upper portion of the supporting member 17 and the auxiliary backrest 5. Set so that the gap E is open. An elastic cushioning body 17a made of urethane rubber or the like is stretched on the upper portion of the support member 17 to cushion the sub backrest 5.

In the above structure, when a person sitting on a chair leans against the backrest 3, the main backrest 4 and the sub-backrest 5 are integrally tilted backwards at first, and the alternate long and short dash line in FIG. 6B and FIG. When the auxiliary backrest 5 contacts the support member 17, the auxiliary backrest 5 stops rearward tilting and almost maintains its posture, as shown in FIG. As indicated by the chain line, only the main backrest 4 tilts rearward against the elasticity of the gas cylinder 12 while deforming the leaf spring 14.

When the person sitting on the chair raises his / her upper body, the main backrest 4 is restored to its original state by the elastic force of the gas cylinder 12, and the auxiliary backrest 9 is restored by the elastic restoring force of the leaf spring 14. , The main backrest 4 and the original state are restored. When a person sitting on a chair leans back on the backrest 3, the back of the person moves a large amount to the back with a slight tilting of the back, but the backrest 5 also tilts backward by such an angle. And that the auxiliary backrest 5 is kept in the same posture with the backward tilt stopped and does not rotate forcibly, so that the auxiliary backrest 5 excessively presses the person's waist. Therefore, it is possible to give a suitable fit feeling to a person in a backward leaning state.

In the above-mentioned embodiment, the leaf spring is used as the spring means. However, as shown in FIG. 8 as the second embodiment, the coil spring 18 may be used, and the sub backrest can be used. 6 is not attached to the backrest support rod 9, but the backside of the sub-backrest 5 and the backside of the main backrest 4 are bent into a U-shape in plan view as shown by the alternate long and short dash line in FIG. 6 (A). The leaf springs 14 'may be used for connection.

When the springs 14 and 18 are built into the hollow backrest support rod 9 as in the first and second embodiments, there is an advantage that the structure can be made compact. FIG. 9 shows the third embodiment. In this embodiment, the support member 17 is pivotally attached to the lower surface of the seat body 1 by the longitudinally extending pins 19, and the upper end of the support member 17 is attached to the auxiliary backrest 5. While being fixed to the rear surface or the like, an appropriate gap is provided between the front end of the support member 17 and the lower surface of the seat 1 so that the rear tilting is stopped when the auxiliary backrest 5 tilts backward to some extent. In that case, the adjusting screw 20 is provided at the front end of the support member 17 so that the angle at which the sub backrest 5 tilts backward can be adjusted.

As shown by the alternate long and short dash line in FIG. 9, the auxiliary backrest 5 may be configured to be tilted in the front-rear direction with an appropriate height portion as the center, and the support member may be a seat. It may be attached to the receiver.

[Brief description of drawings]

FIG. 1A is a schematic perspective view of a chair as seen from the front,
(B) is a schematic perspective view of the chair as seen from the rear.

FIG. 2 is a partially cutaway perspective view showing a main part.

FIG. 3 is a vertical sectional side view of a chair.

4 is a front sectional view taken along the line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a diagram showing an action in a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a side view showing the operation.

FIG. 8 is a diagram showing a second embodiment.

FIG. 9 is a schematic sectional view showing a third embodiment.

[Explanation of symbols]

 1 seat body 2 leg body 3 backrest 4 main backrest 5 sub-backrest 5 seat support body 9 backrest support rod 14, 14 'leaf spring 18 coil spring

Claims (1)

[Scope of utility model registration request] 1. A backrest erected on the rear side of a seat body is separately formed into a main backrest mainly supporting a person's back and a sub-backrest supporting a person's waist, and the main backrest is elastically resistant. While being attached to the seat body or the seat receiving body so as to be tilted rearward, the main backrest and the sub-backrest are associated with each other through spring means so that the main backrest and the sub-backrest can be integrally tilted backward. In the chair, the seat body or the seat receiving body is provided with a support member configured to support the sub backrest against the spring means in a state where the main backrest is tilted rearward by an appropriate angle so as not to be tiltable rearward. Backrest device.