JP2601906Y2 - Backrest device in chair - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a backrest device for a chair.

[0002]

2. Description of the Related Art When a person sitting on a chair leans against a backrest, the back moves largely without moving the waist, so that a gap is formed between the lower part of the backrest and the waist of the person. Therefore, there has been a problem that a person's shirt is pulled upward or the fit is reduced.

[0003] In view of this, a person sitting on a chair is required to fit his / her back to the waist while the upper body is tilted backward.
In the publication No. 0765, the backrest is formed so as to bend in side view around the halfway height portion, and when a person leans on the upper part of the backrest, the bent portion is configured to protrude forward. A device is described in which a bent portion of a backrest supports a human waist.

[0004]

However, in this prior art, when a person leans against the backrest, the backrest immediately starts to bend, and the bent portion of the backrest tends to protrude excessively in a forward convex shape. However, there is a problem that a person's waist may be pressed. Further, each time the backrest is bent, the cushion body and the top sheet covering the cushion body generate a tensile force in the vertical direction, so that the cushion body and the top sheet have low durability. Furthermore, Japanese Utility Model Publication No. 2-1075 discloses that in a chair in which the upper part of the backrest tilts backward, a waist plate is overlapped with the front of the lower part of the backrest, and when a person leans on the backrest, the waist plate protrudes forward. However, in this case as well, since the waist pad only protrudes forward, there is a possibility that the waist of the person may be pressed. On the other hand, 62-161851
In the publication, a connecting plate for supporting the waist of a person is attached to the rear part of the seat so as to be tiltable rearward, and then the tilt is supported by a spring. It is disclosed that the back tilting is supported by a spring. With this type, the connecting plate's rearward tilt angle is smaller than the backrest's rearward tilting angle, and the fit during locking can be improved as compared with a configuration in which the backrest simply tilts backward, but the connecting plate is more rigid than the backrest. Since it is not possible to protrude forward, there is a possibility that the waist of a person cannot be properly supported.

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

[0006]

In order to achieve this object, the present invention separates the backrest into a main backrest mainly supporting the back of a person and a sub-backrest supporting the waist of the person. , attached to the back support member mounted freely rear tilted seat support or seat receiving body, while elastically supported by a spring means tilting after the back support, said sub backrest, front
Rotatably mounted back and forth to dress the support, the sub backrest
Is urged by a spring so that it comes into close contact with the back support and becomes selfish,
Further, the back support member is tilted backward in the seat or the seat support.
Abuts against the backrest in the rear and after the backrest
A configuration is provided in which a support member that stops tilting is provided.

[0007]

[Function and effect of the invention] In this configuration, the backrest
Because it is urged by a spring so as to be in close contact with the back support,
When a person sitting on a chair leans on the back,
Until the back rests against the support member, the main backrest and the
The back is tilted back to a certain angle and the backrest
After contacting the support member, the tilting of the backrest stops and stops.
Only the back support and the main backrest elastically deform the spring.
Tilting back while moving the main backrest away from the secondary backrest
I will do it.

[0008] Then, when a person leaning against the backrest causes the upper body, the main backrest及beauty back support is rotated back to its original state by the spring means, and the main backrest and
When the back support returns halfway, the secondary backrest is
Adhering to the back support, the back support, the main backrest and the vice back
It returns and rotates together with the lean. However, in the present invention, the secondary backrest does not protrude forward in conjunction with the primary backrest, but the secondary backrest tilts backward with the primary backrest within a certain range and then stops.
And excessive pressure child human lumbar vice backrest can be suppressed in the locking state. In addition, since the auxiliary backrest and the main backrest can move relative to each other in the front-rear direction, the auxiliary backrest can be made to protrude from the main backrest. Can be set. In addition, the back support
Because it is attached to the waist, it can accurately support the waist of the person
Although it is a thing, it can be made compact.

Therefore, according to the present invention, the back and the waist can be supported when the body is tilted backward without excessively pressing the waist of the person, so that the user can feel the fit in the rocking state with the body leaning on the backrest. And a comfortable sitting comfort can be obtained. Further, since the main backrest and the sub-backrest are separated from each other, when the main backrest and the sub-backrest are provided with a cushion body, the main backrest and the sub-backrest are tilted backward when the sub-backrest is stopped. The tension in the vertical direction does not act on the cushion body or the top sheet covering the cushion body, and therefore, the durability of the backrest can be improved.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show a first embodiment, FIG. 1 is a perspective view of a chair, FIG. 2 is a partially cutaway perspective view showing a main part, FIG. 3 is a longitudinal side view of the chair, and FIG. 5 is a sectional view taken along the line IV-IV, FIG. 5 is a sectional view taken along the line VV of FIG. 4, FIG. 6 is a view showing the operation in the sectional view taken along the line VI-VI of FIG. 4, and FIG.
In these figures, reference numeral 1 denotes a seat body supported by legs 2, and reference numeral 3 denotes a backrest standing upright behind the seat body 1. The backrest 3 is formed separately as a main backrest 4 for supporting a person's back and a sub-backrest 5 for supporting a person's waist, and a downward recess is provided at a lower portion of the main backrest 4.
4c is hollowed out, and the sub-backrest 5 is arranged in the recess 4c.

For example, as shown in FIG. 2, the main backrest 4 and the sub-backrest 5 are respectively provided with substrates 4a, 5a and cushion bodies 4b, 5b extended therefrom. FIG. 3 and FIG. 4
As shown in the figure, a seat receiver 6 having a U-shaped front section is fitted on the upper end of the leg 2, and horizontal support plates 6 b are integrated with left and right side plates 6 a of the seat receiver 6, respectively. The seat 1 is fixedly connected to the horizontal support plate 6b.

As shown in FIGS. 3 and 4, a tilting member 7 having a downward U-shaped cross section is disposed between the left and right side plates 6a of the seat receiving body 6, and the tilting member 7 is mounted on the horizontal support shaft 8 for the seat. Receiver 6
Pivotally attached to the left and right side plates 6a, and the tilting member 7
A pair of left and right back supports 9 made of a square pipe formed in a letter shape are fixed, and the main backrest 4 is fixed to the upper portions of both back supports 9 with screws 10 (see FIGS. 2 and 4).

Further, as shown in FIG.
One end of a gas cylinder 12 is rotatably locked to a horizontal support pin 11 mounted between the front ends of the left and right side plates 7a. Therefore, the main backrest 4 can tilt rearward against the elasticity of the gas cylinder 12. As shown in FIGS. 2 and 5, bolts 13 extending through both back supports 9 are screwed to left and right end portions of the substrate 5 a in the sub backrest 5, respectively.
A leaf spring 14 formed in a concave shape facing forward is disposed in the hollow portion of the left and right back support 9, the bolt 13 penetrates the top of the leaf spring 14, and a nut 15 is screwed to the tip of the bolt 13. . Therefore, the main backrest 4 and the sub-backrest 5 can relatively move in the front-rear direction of the chair against the elasticity of the leaf spring 14.

A leaf spring is provided on the rear surface of the left and right back support 9.
A square hole 16 for inserting 14 is formed. Then, a substantially L-shaped support member 17 as viewed from the side, which extends toward the back surface of the auxiliary backrest 5, is fixed to the rear lower surface of the seat body 1, and the support member 17 is fixed.
A space E is appropriately provided between the upper part of the vehicle and the sub backrest 5. An elastic buffer 17a made of urethane rubber or the like is stretched over the support member 17 to buffer the auxiliary backrest 5.

In the above configuration, when the person sitting on the chair leans against the backrest 3, the main backrest 4 and the sub-backrest 5 are integrally formed against the elasticity of the gas cylinder 12 in a certain range in the initial stage of the backward tilt. When the sub-backrest 5 comes into contact with the support member 17 as shown by the dashed line in FIGS. 6B and 7, the sub-backrest 5 stops the backward-tilt and almost maintains its posture. Thereafter, as shown by the dashed line in FIGS. 6C and 7, only the main back 4 is
Tilts backward against the elasticity of Tilting after the main backrest 4及beauty back support member 9 is allowed by the leaf spring 14 is elastically deformed.

When the person sitting on the chair raises his / her upper body, the main backrest 4 returns to the original state by the elastic force of the gas cylinder 12, while the auxiliary backrest 5 returns to the main state by the elastic restoring force of the leaf spring 14. While moving so as to approach the backrest 4, the gas cylinder 12 tilts forward together with the main backrest 4 to return to the original state. However, in the state where the person sitting on the chair leans on the backrest 3, the back of the person moves slightly backward with the waist slightly inclined,
Since the sub-back 5 also tilts backward by a certain angle, the lower back 5 does not excessively compress the waist of the person, and therefore, a moderate fit can be given to the person in the rocking state. is there.

In the above-described embodiment, the leaf spring 14 is used as the spring means for returning the sub-backrest 5. However, as shown in FIG.
18 but it may also be used.

As in the first and second embodiments , the back support 9 is formed in a hollow shape and the spring
The configuration incorporating 4,18 has the advantage that the structure can be made more compact.

Further, supporting support member may be attached to the seat receiving member.

[Brief description of the drawings]

FIG. 1A is a schematic perspective view of a chair viewed from the front, and FIG. 1B is a schematic perspective view of the chair viewed from the back.

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

FIG. 3 is a longitudinal side view of a chair.

4 is a front sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a diagram showing an operation in a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a side view showing the operation.

FIG. 8 is a diagram showing a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat 2 Leg 3 Backrest 4 Main backrest 5 Secondary backrest 6 Seat support 9 Back support 14 Leaf spring 17 Support member 18 Coil spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-193107 (JP, A) JP-A-57-50251 (JP, U) JP-A-47-14408 (JP, U) JP-A-62 5048 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) A47C 1/00-9/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A backrest is divided into a main backrest mainly supporting a person's back and a sub-backrest supporting a person's waist, and the main backrest is attached to a seat or a seat receiving body so as to be tiltable rearward . Attached to the back support , the back tilt of the back support is elastically supported by spring means, and the sub-backrest is movable back and forth with respect to the back support.
Attach and attach the backrest to the back support.
Urging with a spring, and furthermore,
During the backward tilt of the support, contact the backrest from behind
A support member for stopping the tilting of the backrest is provided.
A backrest device for a chair.