CN102573571A

CN102573571A - Backrest for chair

Info

Publication number: CN102573571A
Application number: CN2010800469546A
Authority: CN
Inventors: 中山健; 胁园浩一郎; 五十岚僚
Original assignee: Okamura Manufacturing Co Ltd
Current assignee: Okamura Manufacturing Co Ltd
Priority date: 2009-10-19
Filing date: 2010-10-19
Publication date: 2012-07-11
Also published as: JP2011083518A; EP2491821A4; CA2778163A1; US20120212027A1; EP2491821A1; KR20120098633A; WO2011049072A1; JP5606717B2

Abstract

Disclosed is a backrest for a chair wherein both side sections of the lower section of an upholstering material are reduced in tendency thereof to slide with respect to side frames in order to prevent occurrence of slacking etc. of the upholstering material due to riding up and to prevent the front surface section of the upholstering material from excessively bending backward, thereby comfortably supporting the vicinity of the waist of a seated person. For these purposes, high friction members (30, 30) capable of increasing sliding resistance at the section where the upholstering material (26) and right and left side frames (18, 18) are in contact with each other are provided on the inner surface of both side sections of the lower section of the upholstering material (26), which supports the vicinity of the waist of the seated person.

Description

The backrest of chair

Technical field

The present invention relates to the stretch tight backrest of the chair that the finishing material of establishing bag shape forms of on seat back frame suit.

Background technology

As the backrest of this chair, for example record and narrate to some extent at

patent documentation

1 and 2.

Technical literature formerly

Patent documentation

Patent documentation 1: european patent application discloses specification No. 0922419

Patent documentation 2: TOHKEMY 2003-135200 communique

For the finishing material of the bag shape in above-mentioned patent documentation 1 and the 2 described backrests, from viewpoints such as aeration and retractility and tensile strength, mostly use is with the synthetic fibers webbed material of weaving.

As if being stretched tight with the tight state suit of stipulating, such finishing material is located on the seat back frame; Then do not take a seat the person when leaning against on the backrest; The rear face that is positioned at the finishing material of seat back frame rear side is stretched and is forwards unrolled; Thus, be positioned at the front face deflection moderately rearward of the finishing material of seat back frame front side.

At this moment,, then scurry on the both sides of the bottom of finishing material etc., thereby on finishing material, lax and gauffer take place if the resistance to sliding of the contact site of the lateral surface of the left and right sides side frame of the both sides of the bottom of finishing material and seat back frame is little.

In addition; If the resistance to sliding of the contact site of near the both sides of the bottom of the finishing material the supporting person's of taking a seat the waist and the lateral surface of side frame is little; Then unroll to the front face side of seat back frame easily in the both sides of the bottom of finishing material; Make near the front face excessive deflection rearward the supporting person's of taking a seat the waist of finishing material, therefore can not bring into play the lumbar support effect, can not cosily support near the person's of taking a seat the waist.

Summary of the invention

The present invention puts in view of the above problems and makes; Its purpose is to provide a kind of backrest of chair; It is difficult to slide with respect to side frame through the both sides that make the finishing material bottom; Can prevent because of scurrying the generation of the lax grade that causes on the finishing material, and the front face that prevents finishing material bottom excessive deflection rearward, thereby can cosily support near the person's of taking a seat the waist.

According to the present invention, above-mentioned problem solves through following each item.

(1) a kind of backrest of chair; It has on the seat back frame of the pair of right and left side frame of above-below direction; The suit finishing material of establishing bag shape that stretches tight forms; At least any side of near the both sides inner face of the lower side that the waist to the person of taking a seat of said finishing material, supports and the lateral surface of the said left and right sides side frame that contacts with this part is provided with the high friction means of the resistance to sliding of the contact site that can increase finishing material and side frame.

If become such structure, then, therefore can prevent to scurry on the bottom of finishing material and the situation of lax and gauffer etc. takes place at finishing material because the both sides of finishing material bottom are difficult to slide with respect to side frame.

In addition; When the person of taking a seat leans against on the backrest; The both sides of the bottom of finishing material are difficult to unroll to the front face side of seat back frame, and therefore, near the front face of the bottom of the finishing material the supporting person's of taking a seat the waist excessively situation of deflection rearward is prevented; Under the lumbar support effect, can cosily support near the person's of taking a seat the waist.

(2) on the basis of above-mentioned (1) item,,, fix a side end of high friction means through stitching with the mode that covers said suturing part at suturing part its both side ends is folding to the inside and that sew up in order finishing material to be formed a bag shape.

If become such structure, through sew up a side end of high friction means with the mode of the suturing part of the both side ends that covers finishing material, then the both side ends of finishing material is strengthened, and does not worry bursting at the seams etc.

In addition, because slip via the high friction means and the side frame that are fixed on its both sides inner face the bottom of finishing material, therefore, the abrasion of the both sides of the bottom of finishing material are inhibited, the time lengthening of replacement finishing material, and cost reduces.

(3) on the basis of above-mentioned (1) or (2), form high friction means by any one of polyurethane resin or its foaming body, urethanes based elastomers, rubber.

If become such structure, then any material is all preferred as high friction means, and, because be to be shaped easily and the high material of versatility, so enforcement that can be less expensive.

The invention effect

According to the present invention, a kind of backrest of chair can be provided, it can prevent to scurry on the finishing material generation of the lax grade that causes, and the front face that can prevent finishing material bottom excessive deflection rearward, thereby can cosily support near the person's of taking a seat the waist.

Description of drawings

Fig. 1 is the side view of dormant state of chair with embodiment of backrest of the present invention.

Fig. 2 is the side view of the state of taking one's seat of chair shown in Figure 1.

Fig. 3 is a stereogram of watching the state before the suit finishing material on seat back frame from the oblique rear of backrest.

Fig. 4 is the amplification cross-sectional view of the IV-IV line of Fig. 1.

Fig. 5 is the amplification cross-sectional view of the V-V line of Fig. 1.

Fig. 6 is the enlarged drawing of the A portion of Fig. 4.

Fig. 7 is the enlarged drawing of the B portion of Fig. 5.

Fig. 8 is the variation of the mode of hanging down friction means and high friction means is installed in an amplification sectional view from expression to seat back frame.

Fig. 9 is other variation of the mode of hanging down friction means and high friction means are installed in an amplification sectional view from expression to seat back frame.

The specific embodiment

Below, based on description of drawings embodiment of the present invention.

Fig. 1 and Fig. 2 are the side views of chair with embodiment of backrest of the present invention, and this chair has in that the central authorities of discoideus pedestal 1 are upright and is provided with socle 2, is fixed with the substructure body 4 of bearing 3 in the upper end of this socle 2.

Bearing 3 overlook with side-looking under, constitute from the upper end of socle 2 and forwards be extended to leg-of-mutton shape substantially.

The leading section that the boom shaft (standard shaft) 6 of the preceding bottom of seat support 5 by left and right directions is articulated in bearing 3; Seat support 5 constitutes, and is the standby position that tilts to the back upper place as shown in Figure 1 of middle mind-set and the level as shown in Figure 2 or the use location rotation of tilting to the back lower place slightly with boom shaft 6.

At the rear portion, both sides of seat support 5, on seat support 5, formed pair of right and

left handrail

7,7.

Each handrail 7 is made up of backrest pivot 7a of branch and the elbow pad 7b of portion; The backrest pivot 7a of branch erects from the both sides, rear portion of seat support 5; And give prominence to for the side-looking semicircle arcuation at center or fan-shaped flexure plane 8 to the fulcrum 11 of the backrest of stating later on 9 on back surface; The elbow pad 7b of portion is extended forward upwards arcuation from the top of this backrest pivot 7a of branch, handrail 7 whole being shaped as, and convergence and side-looking are triangle forward roughly down towards the front upper place.

The size of the fore-and-aft direction of the elbow pad 7b of portion is set at, and at standby position shown in Figure 1, its leading section is compared through the vertical line S as the center of the boom shaft 6 of the articulated section of seat support 5 and is positioned at its place ahead.

In addition, as shown in Figure 2, when seat support 5 was in the use location, the leading section of the elbow pad 7b of portion was compared above-mentioned vertical line S and is positioned at its rear, the position after the boom shaft 6 that promptly is positioned at than articulates seat support 5 is leaned on a little.

The backrest pivot 7a's of branch of

handrail

7,7 in the left and right sides a little near the lateral surface in the place ahead; Articulate through the fulcrum 11 of cardinal principle by the forwards extended leading section of two side lower parts of backrest 9 towards left and right directions to coxopleure 10; Backrest 9 is that middle mind-set set-up positions shown in Figure 2 and not shown reclined position are rotated with respect to seat support 5 and handrail 7 with fulcrum 11.

Two side lower parts of backrest 9 and the relative part in the rear surface backrest pivot 7a of branch; Constitute the circular-arc concave curved surface 12 of complementary shape (mending shape) substantially as flexure plane 8 with the rear surface of the backrest pivot 7a of branch; Make opposed faces each other close, backrest 9 can be rotated with fulcrum 11 centers.

Between the leading section upper surface of the central portion of the left and right directions of stating lower section frame 20 behind the backrest 9 and bearing 3, be provided with first force application mechanism 13, it is by backrest 9 is constituted to the gas spring that erects the direction application of force or compression spring etc.

In addition, in bearing 3, be provided with second force application mechanism 14, its through to seat support 5 to the standby position application of force, can help seated person to stand up.

This second force application mechanism 14 for example comprises: axis is towards the rubber twist cell 15 of left and right directions; Be connected with this rubber twist cell 15, by the counter clockwise direction application of force under Fig. 1 side-looking and towards the first connecting rod 16 at rear; The bottom is articulated in the leading section of this first connecting rod 16 through the axle of left and right directions, and the axle of upper end through left and right directions be articulated in seat support 5 fore-and-aft direction pars intermedia lower surface, towards the second connecting rod 17 of oblique back upper place.

As shown in Figure 3; Backrest 9 has the seat back frame 22 that front shape is a lengthwise square box shape; It forms through following mode: utilize upper frame 19 towards left and right directions connect towards above-below direction and the lower end be provided with above-mentioned to coxopleure 10, front and back be of a size of towards below between the upper end of the pair of right and

left side frame

18,18 that strengthens gradually; And connect through lower section frame 20 between the lower end of both

sides framework

18,18 towards left and right directions; And then, connecting through central frame 21 between the pars intermedia of left and right directions of upper frames 19 and lower section frame 20, central frame 21 compares that both

sides framework

18,18 is positioned at the rear and towards above-below direction.

This seat back frame 22 is integrally formed by having appropriate flexible synthetic resin material.Preferably in this synthetic resin material, add reinforcing fibers such as glass fibre or carbon fiber to improve intensity.

The bottom of both

sides framework

18,18 and the bottom of central frame 21 are positioned at the circular-arc curved shape in the place ahead for the center of curvature under side-looking, upper frame 19 is overlooked the curved shape that is positioned at the rear down for pars intermedia than both sides with lower section frame 20.Thus, during the finishing material 26 of the bag shape of stating after establishing when on seat back frame 22, stretching tight, the place ahead that is positioned at seat back frame 22 of finishing material 26 and the front face at rear are understood with the rear face front and back and separated than significantly.

In addition, the bottom of backrest 9 is also rearward left from the rear end of seat support 5 and handrail 7, thus, when backrest 9 rotates, prevents to interfere with the rear end of seat support 5 and handrail 7, can increase backrest 9 rearward slewing areas.

Central frame 21 forms carefully than other framework component parts of seat back frame 22, than other parts strain takes place more easily thus, during the front face of the finishing material of after load is applied to, stating 26, can make central frame 21 that strain rearward takes place.

Upper end at seat back frame 22 is provided with head restraint frame 25 integratedly; It forms through following mode: the upper end of

framework

18,18 is provided with and prolongs

framework

23,23 in both sides; Prolong

framework

23,23 towards the top; And more crooked with pars intermedia under side-looking than the mode that top and the bottom are positioned at the place ahead, connect two through top frame 24 and prolong between the upper end of

framework

23,23 towards left and right directions.

As shown in Figure 3, the finishing material 26 of the bag shape with retractility of lower end and both sides lower openings is stretched tight by the top suit and is located on seat back frame 22 and the head restraint frame 25.This finishing material 26 for example is to constitute by synthetic fibers being woven webbed material.Finishing material 26 is made up of headrest covering part that covers head restraint frame 25 27 and the backrest covering part 28 that covers seat back frame 22.

Forwards giving prominence to from the opening of its two side lower part about finishing material 26 makes to

coxopleure

10,10; And; Below the lower section frame 20 of seat back frame 22; Between front face 28a that is bonded to each other at the place ahead of seat back frame 22 and rear through face drag-line, hook, drag-line, other engagement means (diagram is all omited) and the bottom of rear face 28b, thus, finishing material 26 is stretched and located on seat back frame 22 and the head restraint frame 25 with the tight state of regulation.

Need to prove, in the time need not resting the head on, omit the headrest covering part 27 of head restraint frame 25 and finishing material 26 and implement to get final product.

Like Fig. 3～shown in Figure 7; Inner face in the both sides of finishing material 26; Promptly; The inner face of the part that contacts with the lateral surface of the

prolongation framework

23,23 of head restraint frame 25 at the lateral surface except to 10 ones of coxopleures of the

side frame

18,18 of seat back frame 22 is equipped with for the little flexible low friction means 29,29 of thin-walled of two frameworks, 18,23 resistances to sliding.

In addition; Near the both sides inner face of the finishing material 26 the supporting person's of taking a seat waist; That is,, be equipped with for the big flexible high friction means 30,30 of thin-walled of side frame 18 resistances to sliding at the inner face of the finishing material 26 that contacts with the lateral surface of the bottom of both sides framework 18.

Material as above-mentioned low friction means 29; Preference such as polyamide (trade name Na イロ Application), fluororesin (テ Off ロ Application (registration mark), trade name ダイ Off ロ Application), polyacetals etc.; In addition; As the material of high friction means 30, preference such as polyurethane resin or its foaming body, urethanes based elastomers, rubber etc.

Shown in the amplification sectional view of Fig. 6 and Fig. 7; Finishing material 26 with left and right sides side frame 18 the approaching position of inner face with any side's who prolongs framework 23 toe lateral; The folding to the inside and stitching with its both side ends; Form a bag shape thus, when carrying out this stitching so that the part that is folded into U word shape of the leading section of low friction means 29 and high friction means 30 cover finishing material 26 the folding part mode and sew up.Like this, the suturing part 26a of the both side ends of finishing material 26 is able to strengthen.Need to prove, also can not be folded into U word shape with high friction means 30, and just its leading section is sewn to simultaneously the suturing part 26a of the both side ends of finishing material 26 hanging down friction means 29.

Need to prove,, except above-mentioned stitching, also can utilize bonding agent etc. directly to be bonded in the inner face of side frame 18 and the both sides of lateral surface that prolongs framework 23 or finishing material 26 as the installation method of low friction means 29 and high friction means 30.

In addition; As shown in Figure 8; Be provided with groove 31 at side frame 18 and the lateral surface that prolongs framework 23 towards above-below direction; In this groove 31, be entrenched in the prominent protuberance of establishing 32 of medial surface of low friction means 29 and high friction means 30, thus, also can be installed in side frame 18 and the lateral surface that prolongs framework 23 removably with high friction means 30 hanging down friction means 29 towards above-below direction.

In addition; As shown in Figure 9; Can the low friction means 29 and outer removably side frame 18 and the lateral surface that prolongs framework 23 of being embedded in of high friction means 30 of elastically deformable like this, then need be provided with the such groove of Fig. 8 31 with prolonging on the framework 23 at side frame 18 yet.

Need to prove that low friction means 29 also can be the epithelium that forms at side frame 18 and the lateral surface that prolongs framework 23 through coating etc. with high friction means 30.

In the backrest 9 of above-mentioned such structure, if the person of taking a seat leans against on the backrest 9, then shown in two chain-dotted lines of Fig. 4; The front face 28a of finishing material 26 is while extending deflection rearward; The thing followed is that the rear face 28b of finishing material 26 is stretched and extends, and thus, its both sides are shown in arrow; It is a little to unroll to front face 28a side, and the rearward deflection of front face 28a increases.At this moment, be installed in the contacting except the lateral surface of bottom and the lateral surface that prolongs framework 23 of low friction means 29 and side frame 18 of inner face of the both sides of finishing material 26, therefore, the resistance to sliding of these contact sites diminishes.

Consequently; Successfully unroll to front face side in the both sides except the top of bottom of finishing material 26; Thus; The front face 28a of finishing material 26 of back and head that can make the supporting person of taking a seat is with the mode deflection rearward effectively of coincide back and head, and back and head have flexibility and quilt cosily supports.

In addition, when the both sides of finishing material 26 when front face 28a side is unrolled, can prevent to send ear-piercing sliding sound.

In addition, finishing material 26 slides with respect to side frame 18 via the low friction means 29 that is fixed on its both sides inner face, and therefore, the abrasion of the both sides of finishing material 26 are inhibited, and it replaces time lengthening, and cost reduces.

On the other hand; Since near the both sides of the finishing material the supporting person's of taking a seat the waist 26 inner face, promptly with about the inner face of finishing material 26 of the part that contact of the bottom lateral surface of side frame 18 high friction means 30 is installed, so the resistance to sliding increase of the both sides, bottom of side frame 18 and finishing material 26.

Consequently, circular-arc even the bottom of side frame 18 forwards bends to, also scurry on not the bottom of the both sides of finishing material 26, prevents that the bottom of finishing material 26 from producing lax or wrinkling.

In addition, owing to prevent or unroll to the front face side of seat back frame 22 in the both sides, bottom that suppress finishing material 26, so near the tension force of the part the person's of taking a seat the waist, not deflection are rearward exceedingly promptly supported in the bottom of having guaranteed the front face 28a of finishing material 26.Thus, performance lumbar support effect cosily supports the person's of taking a seat waist, so seat comfort improves.

Need to prove; In Fig. 8 and embodiment shown in Figure 9; Slide with respect to low friction means that is installed on side frame 18 29 and high friction means 30 in both sides through finishing material 26; Reduce or increase the resistance to sliding of finishing material 26 and side frame 18, obtain and above-mentioned same action effect.

The invention is not restricted to above-mentioned embodiment, can implement with the mode of many distortion.

For example, in the above-described embodiment, at the both sides inner face except above the bottom of finishing material 26 low friction means 29 is set, but also can omits this low friction means 29, have only the high friction means 30 of bottom.

In addition; In the above-described embodiment; Illustrative be with high friction means 30 be located at finishing material 26 both sides inner face form be located at the form of the lateral surface of side frame 18; But also can high friction means 30 be set, high friction means 29 be contacted with each other, thereby can increase resistance to sliding at the lateral surface of side frame 18 and this two side of both sides inner face of finishing material 26.

The present invention also is applicable to the backrest of the general chair that seat support 5 can't fascinate up and down certainly.

The explanation of symbol

1 pedestal

2 socles

3 bearings

4 substructure bodies

5 seat supports

6 boom shaft

7 handrails

7a backrest pivot branch

7b elbow pad portion

8 flexure planes

9 backrests

10 to coxopleure

11 fulcrums

12 concave curved surfaces

13 first force application mechanisms

14 second force application mechanisms

15 rubber twist cell

16 first connecting rods

17 second connecting rods

18 side frames

19 upper frames

20 lower section frame

21 central frames

22 seat back frames

23 prolong framework

24 top frame

25 head restraint frame

26 finishing materials

The 26a suturing part

27 headrest covering part

28 backrest covering part

The 28a front face

The 28b rear face

29 low friction means

30 high friction means

31 grooves

The S vertical line

Claims

1. the backrest of a chair, it has on the seat back frame of the pair of right and left side frame of above-below direction, and the suit finishing material of establishing bag shape that stretches tight forms, it is characterized in that,

At least any side of near the both sides inner face of the lower side that the waist to the person of taking a seat of said finishing material, supports and the lateral surface of the said left and right sides side frame that contacts with this part is provided with the high friction means of the resistance to sliding of the contact site that can increase finishing material and side frame.

2. the backrest of chair according to claim 1, wherein,

In order finishing material to be formed a bag shape,, fix a side end of high friction means through stitching with the mode that covers said suturing part at suturing part its both side ends is folding to the inside and that sew up.

3. the backrest of chair according to claim 1 and 2, wherein,

Form high friction means by any one of polyurethane resin or its foaming body, urethanes based elastomers, rubber.