CN101573061B

CN101573061B - Backrest device for chair

Info

Publication number: CN101573061B
Application number: CN2007800415510A
Authority: CN
Inventors: 益永浩; 五十岚僚; 小田洋一郎
Original assignee: Okamura Manufacturing Co Ltd
Current assignee: Okamura Corp; Okamura Manufacturing Co Ltd
Priority date: 2006-11-10
Filing date: 2007-11-09
Publication date: 2012-06-13
Anticipated expiration: 2027-11-09
Also published as: JP4948975B2; CN101573061A; JP2008119221A

Abstract

A backrest device for a chair, capable of, without a reduction in its strength and rigidity, effectively bending backward so as to follow the shape of the back of a person seated on the chair, providing the person with excellent sitting comfort. In the backrest device, a back board (11) is supported by a backrest frame, and the back board (11) has a flexible back stopper (13) on the inner side of a back frame (12). The thickness of a vertical intermediate section of the back stopper (13) is gradually increased from both left and right sections of the intermediate section toward the center suchthat the thickness is less in both left and right sections and is maximum at the center.

Description

The back-rest means for chair of chair

Technical field

The present invention relates to a kind of back-rest means for chair of chair, the back-rest means for chair of said chair is included in the back support of the deflection at the back of supporting seated person in the back frame.

Background technology

Among JP2002-125797A, JP2005-160558A (especially accompanying drawing 10-17) and the JP2001-128785A such backrest device for chair is being disclosed for example.

In the backrest shell of the back-rest means for chair of JP2002-125797A and JP2005-160558A, a plurality of openings are formed on the whole backrest shell, the deflection backward when the pushing of the back that receives the people of said backrest shell.But the thickness of backrest shell about equally, and whole backrest shell can not be along the shape deflection backward effectively at back, the comfort that therefore can't obtain to take a seat.

In order to overcome said shortcoming, for deflection more easily, the backrest shell can be made into thinner, but the strength and stiffness of backrest shell reduce, and makes to have reduced durability and because excessive deflection possibly make the comfort that takes a seat become even worse.

In the back-rest means for chair of JP2001-128785A, in the top of backrest shell, have two vertical elongated openings, the engages on the top of said elongated open and back frame is so that the backrest shell can move up and down.In addition, in the bottom of back frame, has the maintaining part of giving prominence to and have groove forward.On the backrest shell, have and combine with maintaining part and be pressed against the lug boss (lobe) on the groove downwards, make the backrest shell supported so that the deflection backward of backrest shell by back frame.

Yet in the supporting construction that is used for the backrest shell, the right side of the backrest shell that is supported by back frame and left side be around the vertical axis rotation, makes that whole backrest shell can not be along the shape deflection backward effectively at people's back.

Summary of the invention

In view of said shortcoming, an object of the present invention is to provide a kind of backrest device for chair, wherein the backrest shell can be effectively reduce the strength and stiffness of backrest shell along the shape deflection at people's back, and said device provides the comfort that takes a seat.

Description of drawings

Fig. 1 is the side view that comprises the chair of back-rest means for chair according to of the present invention.

Fig. 2 is the horizontal cross-section end-view along the amplification of the cutting of the line II-II among Fig. 1.

Fig. 3 is the horizontal cross-section end-view along the amplification of the cutting of the line III-III among Fig. 1.

Fig. 4 is the vertical cross-section side view along the amplification of the cutting of the line IV-IV among Fig. 2.

Fig. 5 is the vertical cross-section side view along the amplification of the cutting of the line V-V among Fig. 3.

Fig. 6 is the decomposition diagram at the jockey of upper end between back frame and backrest shell.

Fig. 7 is the decomposition diagram at the jockey at place, bottom.

Fig. 8 A-8C is the view that shows the backrest shell that how to be supported on the back frame top.

Fig. 9 is the front view of backrest shell.

Figure 10 is the rearview of backrest shell.

Figure 11 is the horizontal cross-section end-view along the amplification of the cutting of the line XI-XI among Fig. 9.

Figure 12 is the horizontal cross-section end-view along the amplification of the cutting of the line XII-XII among Fig. 9.

Figure 13 is the front view of the amplification of back support.

Figure 14 is the horizontal cross-section plan view along the amplification of the cutting of the line XIV-XIV among Figure 13.

The specific embodiment

To describe one embodiment of the present of invention with reference to accompanying drawing.

Fig. 1 is the side view that comprises the chair of backrest device for chair according to of the present invention.Fig. 2 is the horizontal cross-section end-view along the amplification of the cutting of the line II-II among Fig. 1; And Fig. 3 is the horizontal cross-section end-view along the amplification of the cutting of the line III-III among Fig. 1.

Chair 1 comprises that leg unit 4 and each leg 3 with five legs 3 that radially extend have caster 2 endways; Be positioned at the center of leg unit 4 and the post 5 that stretches with the gas spring (not shown); And the pedestal 6 that is fixed on the upper end of said post 5.

At said lower end seat support frame 7 is mounted on the front end of base 6.For pedestal 6, the front end of the lateral frame 8a of back frame 8 is installed on the pivot 9 pivotally.Always promote back frame 8 forward and downwards through the thrust unit (urging means, not shown) in the pedestal 6.

Seat 10 is supported and is supported by lateral frame 8a in rear end by seat support frame 7 at the front end place.

Backrest shell 11 is installed on the front of lateral frame 8a of back frame 8.

In Fig. 9 and 10, backrest shell 11 comprises the high rigidity back frame 12 of rectangle and the back support 13 of deflection, and forms by synthetic resin is Unitarily molded.

Back frame 8 and backrest shell 11 be bent make in Fig. 1 middle and upper part more outstanding slightly than the bottom.

The lateral frame 8a of back frame 8 and the distance between the 8a narrow down backward.

In Fig. 1,2,4 and 6, when first ledge 14 being arranged on the front of upper end of each lateral frame 8a, first holding portion 15 is formed on the back of lower end of back frame 12.

First ledge

14,14 upwards is assemblied in

first holding portion

15,15, makes the back of back frame 12 supported by the front of

lateral frame

8,8.

In Fig. 6, first ledge 14 comprises first 16 and support member 17, and outstanding forward on the front of the upper end of lateral frame 8a.

Bring on the section pipe 18 through closed C shape and form first holding portion 15, said pipe at the rear end opening as slit.First 16 of first ledge 14 upwards is assemblied in the pipe 18 of first holding portion 15 and support member 17 is assemblied in the pipe 18, and the axle 16 of winning is assemblied in the pipe 18 to rotate around vertical axis.

In Fig. 1,3,5 and 7, second ledge 21 is arranged on the back side of sidepiece of sweep 20 of back frame 12, and second holding portion 23 is arranged on the sweep 22 of lateral frame 8a simultaneously.

Second ledge

21,21 is bonded in

second holding portion

23,23, makes the back frame 12 of backrest shell 11 be supported on the

sweep

20,22.

In Fig. 7, second holding portion 23 comprises a pair of

projection

24,24 that is spaced apart from each other, and inner surface 24a, the 24a of

projection

24,24 are become by interior concave relief.

Second 25 a pair of horizontal component and the following

horizontal component

27,27 gone up that comprises the axle main body 26 of slightly being longer than

projection

24,24 and be slightly larger than the diameter of a main body 26 of second ledge 21.

The axle main body 26 of second ledge 21 is pressed on the opening 28 between the

projection

24 and 24 of second holding portion 23 so that opening 28 is flexibly opened.Therefore, axle main body 26 is assemblied between interior surface opposing 24a and the 24a, and second 25 of second ledge 21 is bonded in second holding portion 23 to rotate around vertical axis.

Fig. 8 A-8C shows how back frame 8 supports backrest shell 11.

In Fig. 8 A and 6, backrest shell 11 moves down.First 16 of first ledge 14 is bonded in the pipe 18 of first holding portion 15, simultaneously first 16 support member 17 that is fixed on the lateral frame 8a is assemblied in the opening 19 of pipe 18.

Subsequently; In Fig. 8 B and 7; The axle 26 of second ledge 21 that will be on the sweep 20 of back frame 12 is pressed in the opening 28 between the

projection

24 and 24 of second holding portion 23 on the sweep 22 of lateral frame 8a backward, and makes opening 28 open so that axle 26 is bonded between

projection

24 and 24.

Therefore, in Fig. 8 C, backrest shell 11 is supported rotating around vertical axis, and has enough intensity at the sweep 22 of the lateral frame 8a of back frame 8 with four some places on the upper end.

In Fig. 2 and 3, after backrest shell 11 is installed, between the front of the back of the sidepiece of back support 13 and lateral frame 8a, formed space 29, in each sidepiece deflection backward of said space 29 place's back support 13.

Afterwards, in Fig. 9-14, will be described in detail backrest shell 11.

Two

vertical ribs

30,30 are outstanding on the back surface of the sidepiece of the back frame 12 of backrest shell 11.

On the whole surface of back support 13, form a plurality of vertical slits 31 at regular intervals.Flatly adjacent slit 31 is flatly staggered by half length with said slit 31.Said slit 31 vertically in line.

Through the layout of said slit 31, the connecting portion between the slit 31 (web) flatly staggers but is misaligned.A plurality of slits 31 can not make the intensity of back support 13 reduce.

In Figure 11, back support 13 is the thickest and flatly reduce gradually to side at the mid portion of width, and back support 13 is the thickest and vertically reduce gradually to top and bottom at the mid portion of vertical length in Figure 12 simultaneously.

In Figure 13 and 14, back support 13 has the vertically extending rib 32 of square-section and therefore has the level cross-sectionn of the U-shaped among Figure 11 on the surface, back.Said slit 31 forms along the thin part 33 between adjacent rib 32.

As stated; In the foregoing embodiments; The back support 13 of being pushed by people's back is the thickest and reduce gradually with left-hand end thickness to the right at the mid portion of width, make flexible rigidity in the middle maximum so that left and right sides shown in the two point dotted line among Figure 11 than more easily deflection of centre.Therefore, the mid portion of back support 13 makes that entire back is stably supported, thereby the comfort that takes a seat is provided along the shape deflection at people's back.

Back support 13 is the thickest in to increase flexible rigidity at the mid portion of length.The mid portion of being pushed by the back powerfully be prevented from taking place shown in the two point dotted line among Figure 12 like convex ground (convex) deflection backward exceedingly.The mid portion at said back is suitably supported, and the intensity of back support 13 can not reduce.

The cross section rib 32 of a plurality of rectangles is outstanding and extension vertically on the back surface of back support 13.Therefore, back support 13 increases bending stiffness along the thickness direction perpendicular to width.No matter what of the number of slit, the intensity of back support 1 is improved.Back support 13 has U type level cross-sectionn, and slit 31 forms along the thin part 33 between adjacent rib 32.Therefore, back support 13 centers on slit 31 to after-opening on the surface, back, and deflection backward easily.

The present invention is not limited in aforesaid embodiment.

In force, the adjacent slit 31 in the back support 13 flatly staggers, and makes each other in a straight line but can be formed.Can form the slit of different length.

Except above-mentioned slit, can form with said embodiment is similar but the back support that thickness is different.

Claims

1. backrest device for chair, the backrest shell that wherein has the back support of the deflection in back frame is supported by back frame, it is characterized in that:

Said back support is the thickest and to side attenuation gradually at the mid portion of width.

2. backrest device for chair, the backrest shell that wherein has the back support of the deflection in back frame is supported by back frame, and said back support is the thickest and to top and bottom attenuation gradually at the mid portion of length, it is characterized in that:

Said back support has along the slit of a plurality of vertical length of said length and width setting.

3. backrest device for chair, the backrest shell that wherein has the back support of the deflection in back frame is supported by back frame, it is characterized in that:

Said back support is the thickest and to side attenuation gradually at the mid portion of width, and said back support is the thickest and to top and bottom attenuation gradually at the mid portion of length.

4. like claim 1 or 3 described backrest device for chair, wherein said back support has along the slit of a plurality of vertical length of said length and width setting.

5. backrest device for chair as claimed in claim 4, wherein slit is flatly staggered.

6. backrest device for chair as claimed in claim 4; Wherein along the back lip-deep space that is provided with between thickness has the rib of square-section flatly in said back support; Said back support has the U-shaped cross-section of level, and said slit forms along the thin part between the adjacent rib.

7. backrest device for chair as claimed in claim 1; Wherein between the front of the right side of the right side on the back of said back support and left side and said back frame and left side frame, have the space, make the side of said back support by deflection and the bending backward of the weight backward at the back of seated person.

8. backrest device for chair as claimed in claim 7, the level cross-sectionn of the lateral frame of wherein said back frame are outstanding backward so that the V-arrangement in said space to be provided.

9. backrest device for chair as claimed in claim 1; Wherein said back frame and said back frame are the soft V-arrangements with upper and lower; Wherein said top is more outstanding slightly than said bottom, and said back support is supported with the vertical axis of at least one place around left side and right side in sweep and upper end by said back frame and rotates.

10. backrest device for chair as claimed in claim 9; Wherein holding portion is arranged on of apparent surface of said back frame and said back frame; Another has vertical axis; Said vertical axis engages to center on said vertical axis with the described accommodation section branch and rotates, thereby makes said back frame by the anterior support of said back frame.

11. backrest device for chair as claimed in claim 1, wherein vertical rib is arranged on the back surface of sidepiece of said back frame.