CN102548452A

CN102548452A - Chair

Info

Publication number: CN102548452A
Application number: CN2010800469438A
Authority: CN
Inventors: 奥田直之; 井泽晶一
Original assignee: Okamura Manufacturing Co Ltd
Current assignee: Okamura Manufacturing Co Ltd
Priority date: 2009-10-19
Filing date: 2010-10-19
Publication date: 2012-07-04
Also published as: KR20120099014A; JP2011083527A; CA2778166A1; JP5693837B2; US20120205948A1; EP2491822A4; WO2011049073A1; EP2491822A1

Abstract

A chair configured in such a manner that an option member can be stably and easily mounted to the chair using a simple configuration, that the mounting position of the option member in the vertical direction can be easily adjusted, and that the appearance of the backrest after the option member is removed can be kept good. Grooves (19) which are oriented in the vertical direction and are recessed rearward and forward are provided in both the front and rear surfaces of each of both the left and right side sections of the backrest (6), and portions of mounting members (22) provided to both the side sections of a hanger (21), which is the option member, are engaged with the grooves (19) to mount the option member to the backrest (6).

Description

Chair

Technical field

The present invention relates to chair, the chair of alternative pack particularly is installed on backrest.

Background technology

Current chairs is equipped with alternative packs (for example with reference to patent documentation 1～5) such as the clothes hanger that is used to hang clothes, headrest on backrest.

Patent documentation 1: TOHKEMY 2005-245866 communique

Patent documentation 2: TOHKEMY 2006-110013 communique

Patent documentation 3: No. 3801769 communique of japanese

Patent documentation 4: No. 4146890 communique of japanese

Patent documentation 5: No. 4097186 communique of japanese

But, in above-mentioned current chairs, be used on backrest, installing complicated, the installation exercise trouble of mounting structure of alternative pack; And with alternative pack after backrest is pulled down; Residual as the screwed hole of the part of mounting structure etc., it is exposed to the outside, has the problems such as attractive in appearance that diminish.

Summary of the invention

The present invention makes in view of the above problems; Its purpose is to provide a kind of chair; It can be stable and alternative pack is installed reliably on backrest through simple structure; And regulate the installation site of alternative pack on above-below direction easily, and can keep pulling down the attractive in appearance of backrest behind the alternative pack.

According to the present invention, adopt following proposal to solve above-mentioned problem.

(1) two sides, front and back of portion is provided with towards the rear and the place ahead depression and towards the groove of above-below direction in the left and right sides of backrest, and the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

According to said structure; The part of the installing component of alternative pack is fastened in the groove that is arranged at backrest left and right sides portion; Thereby can and alternative pack be installed reliably through simple Stability Analysis of Structures, and, no matter can both alternative pack be installed with same structure in which position (highly) along groove; Therefore, regulate the installation site of alternative pack on above-below direction easily.

In addition, behind the dismounting alternative pack, therefore the part of mounting structure such as residual screwed hole etc., can not keep the attractive in appearance of backrest.

(2) on the basis aspect above-mentioned (1), the groove of front and back that makes the backrest both sides is each other along fore-and-aft direction alignment, and the horizontal cross-section of backrest both sides is formed roughly H shape.

According to said structure,, therefore, can the installing component of alternative pack be installed, thereby can make the installation form variation of alternative pack with the mode of front and back upset because the front and rear surfaces of backrest both sides is symmetrical before and after forming.

(3) be provided with towards rear depression and towards the groove of above-below direction at the front surface of backrest, the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

According to said structure, only be limited to the front surface of backrest through the groove that a part engaged with the installing component of alternative pack, just can play same effect and the effect of invention with above-mentioned (1) aspect.

(4) be provided with on the back surface of backrest towards the place ahead depression and towards the groove of above-below direction, the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

According to said structure, only be limited to the back surface of backrest through the groove that a part engaged with the installing component of alternative pack, just can play identical effect and the effect of invention with above-mentioned (1) aspect.

(5) on the basis of arbitrary aspect, utilize and stop up up and down arbitrary side's the end-plugged of sheet in aspect above-mentioned (1)～(4) the groove of backrest.

According to said structure, can utilize stop up installing component that sheet stops alternative pack from backrest to above or below come off.

(6) on the basis of arbitrary aspect, backrest constitutes to have: the pair of right and left side lever in aspect above-mentioned (1)～(5); Two side levers are linked and the thickness backboard littler than the thickness of the fore-and-aft direction of said two side levers of fore-and-aft direction each other, and said two side levers are provided with groove.

According to said structure, side lever and backboard about can utilizing same material integrally formed, and can not reduce the intensity of the backrest both sides of the installing component that alternative pack is installed, and it is flexible also backboard to be had.

(7) in aspect above-mentioned (1)～(6) on the basis of arbitrary aspect, be provided with protuberance or recess, the part of installing component is engaged with this protuberance or recess at the inner face of groove.

According to said structure, engage with the part of installing component through making the protuberance or the recess that are arranged at the groove inner face, can stop the installing component of alternative pack to move along groove.

(8) in aspect above-mentioned (1)～(7) on the basis of arbitrary aspect; The inner face of groove along the vertical direction across appropriate intervals be provided with a plurality of protuberances or recess; Part through making installing component optionally is fastened on this protuberance or recess, thereby the mode of alternative pack with the installation site that can regulate above-below direction is installed on the backrest.

According to said structure, optionally be fastened on a plurality of protuberances or recess through a part that makes installing component, the installation site that can regulate alternative pack is to be installed in it a plurality of height.

(9) on the basis aspect above-mentioned (8), the installing component of alternative pack constitutes to have: select the side of parts to extend and surround the encirclement sheet of the side end of backrest laterally certainly; Be arranged at the elastomeric element of this encirclement sheet; The engaging pawl of end that is arranged at up and down arbitrary side of said encirclement sheet leading section is entrenched in the groove of backrest and optionally is fastened on a plurality of protuberances or recess that are arranged at groove; Can alternative pack be limited to backrest at a plurality of height thus; And; Utilize said elastomeric element with said installing component with respect to backrest to the direction application of force that said engaging pawl is engaged with protuberance or recess, move through making this active force of said alternative pack resistance, can said engaging pawl be broken away from from protuberance or recess.

According to said structure, the installation site that not only can regulate alternative pack to be being installed in it a plurality of height, and; Active force through making alternative pack resistance elastomeric element moves; The engaging pawl is broken away from, under this state, after installing component is moved up and down along groove from protuberance or recess; The engaging pawl is engaged with other protuberances or recess, thus the installation site that can change alternative pack simply.

(10) on the basis of arbitrary aspect, the installing component of alternative pack constitutes to have in aspect above-mentioned (1)～(8): select the side of parts to extend and surround the encirclement sheet of the side end of backrest laterally certainly; Be arranged at the elastomeric element of this encirclement sheet, the leading section of said encirclement sheet and the arbitrary at least side in the elastomeric element are fastened in the groove of backrest, make and utilize the leading section of said encirclement sheet and the side end of elastomeric element clamping backrest from front and back.

According to said structure; Through the leading section that surrounds sheet and the arbitrary at least side in the elastomeric element are fastened in the groove of backrest; Can stop installing component to move up at right and left; Under this state, can utilize the leading section and the elastomeric element that surround sheet to suppress the side end of controlling backrest from front and back.

(11) in aspect above-mentioned (1)～(10) on the basis of arbitrary aspect, alternative pack be the clothes hanger that is used for hanging clothes, headrest, handrail, lumbar support any or a plurality of.

According to said structure, various alternative packs that can function is different are installed on the backrest separately or with a plurality of combinations simply, thereby can make the chair variation.

According to the present invention, a kind of chair can be provided, it can and install alternative pack reliably through simple Stability Analysis of Structures, and regulates the installation site of alternative pack on above-below direction easily, and can keep pulling down the attractive in appearance of backrest behind the alternative pack.

Description of drawings

Fig. 1 is the side view of an embodiment of chair of the present invention.

Fig. 2 is the rearview of chair shown in Figure 1.

Fig. 3 is the vertical view of chair shown in Figure 1.

Fig. 4 is an exploded perspective view of seeing backrest from oblique the place ahead.

Fig. 5 is an exploded perspective view of seeing clothes hanger from oblique the place ahead.

Fig. 6 is the cross-sectional vertical view of amplification along the VI-VI line of Fig. 2.

Fig. 7 is the amplification vertical profile side view along the VII-VII line of Fig. 2.

Fig. 8 is the cross-sectional vertical view of amplification along the VIII-VIII line of Fig. 2.

Fig. 9 is an exploded perspective view of seeing the mounting portion of clothes hanger from oblique rear.

The specific embodiment

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

Like Fig. 1～shown in Figure 3, this chair has pin body 3, and this pin body 3 is included in leading section and has castor 1 and radial five foot levers 2.In the central authorities of pin body 3, erect and to be provided with the have air spring telescopic socle 4 of (omitting diagram), be fixed with the rear portion of bearing (fork group) 5 in the upper end of socle 4.

Bearing 5 constitutes the general hollow case shape of end face opening, and the cover 5a that the peristome of end face can be loaded and unloaded covers.

The set inside of bearing 5 have pair backrest 6 towards the direction that erects be the force application mechanism of the place ahead application of force, to by the force application mechanism (all omitting diagram) of seat support 7 application of force of bearing 5 supportings etc. towards the place ahead; But because above-mentioned force application mechanism and the present invention do not have direct relation; Therefore, omit diagram and detailed description.

As shown in Figure 4, backrest 6 utilizes and sees 9,9 supportings of L-shaped pair of right and left back support bar from the side, and the bend in the middle of this

back support bar

9,9 links through the web 8 towards left and right directions each other.

The leading section of this

back support bar

9,9 is pivotally mounted on the bearing 5 through the axle 10 of left and right directions; The end is attached at the effect of the rearward end of bearing 5 and the air spring 11 (with reference to Fig. 1) on the web 8 before and after utilizing, and back

support bar

9,9 and backrest 6 can be center direction rotation forwards, backwards or stop with desirable hypsokinesis angle with axle 10.

As shown in Figure 4, backrest 6 has: pair of right and

left side lever

12,12; Two side levers 12,12 are linked and the thickness backboard 13 littler than the thickness of the fore-and-aft direction of two side levers 12,12 of fore-and-aft direction each other.

The first half 13a of backboard 13 is near the leading edge of two side levers 12,12 and engage, and likewise, Lower Half 13b is near the trailing edge of two side levers 12,12 and engage, and is formed with the stage portion (omitting diagram) of level in their centre.

This two side lever 12,12 and backboard 13 preferably utilize rubber-like hard resin material integrally formed and form.

Like this; Because backrest 6 has pair of right and

left side lever

12,12 and two side levers 12,12 is linked and the thickness backboard 13 littler than the thickness of the fore-and-aft direction of two side levers 12,12 of fore-and-aft direction each other; Therefore; The intensity of backrest 6 both sides of the installing

component

22,22 of the clothes hanger of stating after the installation 21 can not reduce,

side lever

12,12 and backboard 13 about can utilizing same material integrally formed, and it is flexible also backboard 13 to be had.

Be provided with a plurality of slotted holes 14 that are used to increase length on the flexible above-below direction at the first half 13a of backboard 13.

In addition, the front surface both sides at the Lower Half 13b of backboard 13 are provided with a plurality of ribs 15 that are used to improve rigidity.

Backrest 6 is supported by

back support bar

9,9 with following state; Promptly; With about the upper end of

back support bar

9,9 insert backboard 13 Lower Half 13b front surface about rib 15, between 15; And through omitting the Lower Half 13b that illustrated installing component is fixed on web 8 backboard 13; Through forming the preceding overlay 16 with the roughly the same shape of Lower Half 13b of backboard 13 so that should before the front surface of overlay 16 mode of aliging with the front surface of the first half 13a of backboard 13 with the front surface covering of front surface and the web 8 of the Lower Half 13b of said backboard 13.

And the back surface of the front surface of the first half 13a of the front surface of preceding overlay 16, backboard 13 and the first half 13a of backboard 13 is covered by the padded coaming 17 of doubling.

The two sides, front and back of the left and right sides side lever 12,12 in backrest 6; Towards the rear and the place ahead depression and towards the front and back of above-below direction a pair of

groove

18,19 is provided with along fore-and-aft direction alignment ground each other; As shown in Figure 6, the horizontal cross-section of each side lever 12 that is provided with the part of this

groove

18,19 forms roughly H shape.

Be blocked

patch

18a, 18b, 19a, 19b of the upper end of the

groove

18,19 of the front and back in each side lever 12 and lower end stops up, and thus, the installing component of stating after can preventing 22,22 comes off above or below backrest 6.

Need to prove, can be through omitting the arbitrary side among obstruction sheet 18a up and down, 18b, 19a, the 19b, upper end and the arbitrary side in the lower end who makes

groove

18,19 towards above or below open wide.

As shown in Figure 7, the groove bottom of groove 18 forwardly, along the vertical direction across appropriate intervals be provided with that the upper surface is level and the side is seen as leg-of-mutton a plurality of protuberance 20.

Need to prove, also can replace this protuberance 20 and form the lower surface and be level and be seen as leg-of-mutton a plurality of recess (omitting diagram) from the side.

The part of the installing

component

22,22 that the both sides of the clothes hanger 21 that promptly is used at alternative pack shown in Figure 5 to hang clothes are provided with engages with the

groove

18,19 of the front and back that are arranged at left and right

sides side lever

12,12, and clothes hanger 21 is installed on the backrest 6 and is provided in the rear side of backrest 6.

Each installing component 22 of clothes hanger 21 has: the encirclement sheet 23 that extends and surround from rear side to front surface side the side end of backrest 6 from the side of clothes hanger 21 laterally; Utilize bolt/nut 25d can be fixed on the elastomeric element 25 of the interior corner part at these encirclement sheet 23 rears with loading and unloading.

Around the top that respectively surrounds sheet 23 front ends to each side lever 12 front surface; Be provided with towards the rear and the lower end is level, the side is seen as leg-of-mutton engaging pawl 24; This engaging pawl 24 is entrenched in the groove 18 of side lever 12 front surfaces; Optionally be arranged at groove 18 in a plurality of protuberances 20 engage, thereby can clothes hanger 21 be limited to backrest 6 at a plurality of height.

Like Fig. 7～shown in Figure 9, elastomeric element 25 has: utilize bolt/nut 25d to be fixed in the installation portion 25a that surrounds sheet 23; Extend and be entrenched in the groove 19 on each surface, side lever 12 back and be crimped on the elastic tongue piece 25b of the groove bottom of this groove 19 to the front upper place from this installation portion 25a; From the butt sheet 25c of installation portion 25a to the lateral margin butt of the groove 19 on front lower place extension and front end and surface, each side lever 12 back.

Make the lateral margin butt of groove 19 on surface, front end and each side lever 12 back of the butt sheet 25c of elastomeric element 25; And make elastic tongue piece 25b be entrenched in the groove 19 on surface, side lever 12 back and be crimped on the groove bottom of this groove 19; Thus; To engaging pawl 24 application of forces so that it is crimped on the groove bottom of the groove 18 of side lever 12 front surfaces; Utilize the elastic tongue piece 25b and the butt sheet 25c of this engaging pawl 24 and elastomeric element 25, cramping is controlled each side lever 12 from front and back, and then makes the lower edge butt of engaging pawl 24 and be sticked in the end face of any protuberance in a plurality of protuberances 20 in the groove 18; The

side lever

12,12 about thereby the installing component about can making 22,22 is sticked in the mode that can not descend easily securely, so can stablize and powerful supporting clothes hanger 21.

When the installation site wanted at above-below direction adjusted clothes hanger 21, make elastic tongue piece 25b strain and make clothes hanger 21 shown in double dot dash line among Fig. 7, revolt its active force, be that fulcrum forwards rotates or promotes towards the place ahead with its bottom.

So engaging pawl 24 is that fulcrum forwards rotates with butt sheet 25c lower front end or encirclement sheet 23 anterior lower end inner edges, thereby forwards breaks away from from protuberance 20.

Under this state, with clothes hanger 21 integral body to above or below move, engaging pawl 24 is engaged with any other protuberance 20 up and down gets final product.

Need to prove, when clothes hanger 21 is moved,, then engage the protuberance 20 that pawl 24 is sticked in the below naturally downwards as if making clothes hanger 21 return original hypsokinesis posture and it being descended.

Make clothes hanger 21 to above when moving; Even if make clothes hanger 21 return original hypsokinesis posture and make its rising; Engaging pawl 24 also can be climbed on the lower edge that tilts towards the front upper place of top protuberance 20, in case after forwards being pushed, this engaging pawl 24 can engage with the end face of this protuberance 20.

In this embodiment, clothes hanger 21 has: the above-mentioned a pair of installing

component

22,22 that is installed in the left and right sides portion of backrest 6 as stated; The a pair of bearing

support

26,26 that extends towards the inboard each other in the rear side of backrest 6 from two installing

components

22,22; The inner from two bearing supports 26,26 erects

frame

27,27 towards the top with the pair of angled that the mode of expanding is toward the outer side each other extended; Link to each other setting and of the upper end that each end and two tilts to erect

frame

27,27 towards the upper shelf 28 of left and right directions.At least above-mentioned inclination erects

frame

27,27 and upper shelf 28 and is formed by material that can strain.

In addition, below upper shelf 28, towards the both ends of the auxiliary frame 29 of left and right directions with about inclination

erect frame

27,27 setting that links to each other.

In this embodiment; Upper shelf 28 is seen from behind bend to circular-arc to the top; And; Auxiliary frame 29 is seen from behind bend to downwards circular-arc, with the right ends portion of upper shelf 28 and auxiliary frame 29 each other with about inclination erect the setting that links to each other of mode that the upper end of

frame

27,27 mutually combines.

And the central part of auxiliary frame 29 is in the place ahead of the central portion of upper shelf 28.

Clothes hanger 21 is preferably; Utilize

encirclement sheet

23,23, bearing

support

26,26, the inclination of the integrally formed installing

component

22,22 of hard resin material to erect

frame

27,27, upper shelf 28, auxiliary frame 29; Utilize other material only to form

elastomeric element

25,25, utilize bolt/nut 25d that above-mentioned

elastomeric element

25,25 is installed in and surround on the

sheet

23,23.

Because this clothes hanger 21 is installed in installing

component

22,22 left and right sides portion of backrest 6; Therefore, stress can not concentrate on central authorities but about disperse, clothes hanger 21 self can not roll; Can stably support clothes etc., and 22,22 miniaturizations of the installing component about can making.

In addition, the back side shape that clothes hanger 21 is installed in 6 last times of backrest forms and makes two Z-shaped unique shapes of practising physiognomy and combining over the ground, and outward appearance is good; And, not only when clothes hanger 21 is installed, even and if after pulling down clothes hanger 21; Also residual screwed hole etc. not on backrest 6, so outward appearance is good.

And; Through forming at least to tilt to erect

frame

27,27 and upper shelf 28, when the even load of pledging clothes puts on upper shelf 28, tilt to erect

frame

27,27 and upper shelf 28 produces strains by material that can strain; Thereby left and right

sides bearing support

26,26 is a fulcrum with installing

component

22,22; Particularly, the parts that are connected to surface, side lever 12 back with the front end of the butt sheet 25c of elastomeric element 25 are that the torque that fulcrum is desired to rotate towards the below is worked, and utilize this torque; Installing

component

22,22 firmly is fastened on the both sides of backrest 6, thereby also has the advantage of the bond strength that increases installing

component

22,22 and backrest 6.

Since upper shelf 28 see from behind bend to the top circular-arc, therefore, with respect to the easy deflection of load from the top, thereby can dispersive stress.

In addition and since auxiliary frame 29 see from behind bend to downwards circular-arc, therefore; Can on this auxiliary frame 29, hang up the garment appendage article of necktie, scarf, tippet and so on etc.; Not only can increase convenience, and owing to hang over the central portion of the accessory etc. of the clothes on the auxiliary frame 29 near auxiliary frame 29, therefore; Even if hang under the state on the upper shelf 28 at last clothing, also can be easily with taking-ups such as above-mentioned accessories.

And,, therefore,, also can be easily hang on the auxiliary frame 29 accessory of clothes etc. or from its taking-up even if hang under the state of upper shelf 28 at last clothing because the central portion of auxiliary frame 29 is in the place ahead of upper shelf 28 central portions.

Since with about installing component 22 be installed in the both sides of backrest 6 with the mode that can regulate the installation site on the above-below direction, therefore, when not using clothes hanger 21; Upper end height such as grade through making upper shelf 28 and backrest 6 or be in than its low down position, clothes hanger 21 has no relations, in addition; When using clothes hanger 21; Through making upper shelf 28 be in the lifting position of the top of backrest 6 upper ends, easily clothes etc. is hung on the clothes hanger 21, can prevent that the lower end of clothes etc. from running into the floor.

In illustrated embodiment; Pair of right and left

handrail

30,30 is installed in two sides at bearing 5; But also can constitute; The same parts of parts that after the rear end of this handrail 30 is installed and overturn in above-mentioned installing component 22 front and back, obtain are installed in it on each side lever 12 to compare preposterous relation with above-mentioned situation, each handrail 30 are installed in the both sides of backrest 6 with the mode that can regulate height.

Like this, as alternative pack, except that above-mentioned clothes hanger 21 and handrail; Can select headrest, lumbar support etc.; The part of any or a plurality of installing component that is arranged at both

sides

22,22 of above-mentioned alternative pack is fastened in the

groove

18,19 of arbitrary of front and back that are arranged at backrest 6 left and right sides portions, thereby above-mentioned alternative pack is installed on the backrest 6, thus; Can be through simple Stability Analysis of Structures and above-mentioned alternative pack is installed on backrest 6 reliably; And,, can both alternative pack be installed with same structure no matter in which position (highly) along groove 18,19.Therefore, regulate the installation site of alternative pack on above-below direction easily.

In addition, after pulling down alternative pack, therefore screwed hole of not residual part as mounting structure etc., can keep the attractive in appearance of backrest.

And, be installed on the backrest alone or in combination through the various alternative packs that function is different a plurality ofly, can make the chair variation.

The present invention is not limited in above-mentioned embodiment, can adopt following various deformation mode to implement.

(1) the arbitrary side in the

groove

18,19 of front and back only is set and omits the opposing party on each side lever 12; The engaging pawl 24 of installing component 22 is entrenched in

set groove

18 or 19; The elastic tongue piece 25b and the butt sheet 25c of elastomeric element 25 are crimped on the face that this side of groove is not set in side lever 12 front-backs; Elastic tongue piece 25b and the butt sheet 25c that utilizes engaging pawl 24 and elastomeric element 25 from front and back cramping control each side lever 12, thereby clothes hanger 21 is supported.

(2) omit protuberance 20; With engaging pawl 24 be entrenched in the groove 18 and with the groove bottom butt of groove 18; Only elastic tongue piece 25b through utilizing engaging pawl 24 and elastomeric element 25 and butt sheet 25c from front and back cramping control each side lever 12, just can support clothes hanger 21.

(3) will engage pawl 24 and be arranged on bottom around encirclement sheet 23 front ends that arrive each side lever 12 front surface; Therewith explicitly; Make the elastic tongue piece 25b of elastomeric element 25 extend setting towards the front lower place from installation portion 25a, and, butt sheet 25c is extended towards the front upper place from installation portion 25a be provided with; Other alternative packs beyond the clothes hanger 21 are rotated to the back lower place, thereby engaging pawl 24 is broken away from towards the place ahead from protuberance 20.

Description of reference numerals

1 castor

2 foot levers

3 pin bodies

4 socles

5 bearings

The 5a cover

6 backrests

7 seat supports

8 webs

9 back support bar

10

11 air springs

12 side levers

13 backboards

The 13a first half

The 13b Lower Half

14 slotted holes

15 ribs

Overlay before 16

17 padded coamings

18,19 grooves

18a, 18b, 19a, 19b stop up sheet

20 protuberances

21 clothes hangers (alternative pack)

22 installing components

23 surround sheet

24 engaging pawls

25 elastomeric elements

The 25a installation portion

The 25b elastic tongue piece

25c butt sheet

26 bearing supports

27 tilt to erect frame

28 upper shelf

29 auxiliary frames

30 handrails

Claims

1. a chair is characterized in that,

The two sides, front and back of portion is provided with towards the rear and the place ahead depression and towards the groove of above-below direction in the left and right sides of backrest, and the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

2. chair as claimed in claim 1 is characterized in that,

The groove of front and back that makes the backrest both sides is each other along fore-and-aft direction alignment, and the horizontal cross-section of backrest both sides is formed roughly H shape.

3. a chair is characterized in that,

Be provided with towards rear depression and towards the groove of above-below direction at the front surface of backrest, the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

4. a chair is characterized in that,

Be provided with towards the place ahead depression on the back surface of backrest and towards the groove of above-below direction, the part of the installing component through will being arranged at the alternative pack both sides is fastened in the said groove and alternative pack is installed on the said backrest.

5. like each described chair in the claim 1～4, it is characterized in that,

Utilize and stop up up and down arbitrary side's the end-plugged of sheet the groove of backrest.

6. like each described chair in the claim 1～5, it is characterized in that,

Backrest constitutes to have: the pair of right and left side lever; Two side levers are linked and the thickness backboard littler than the thickness of the fore-and-aft direction of said two side levers of fore-and-aft direction each other,

Said two side levers are provided with groove.

7. like each described chair in the claim 1～6, it is characterized in that,

Inner face at groove is provided with protuberance or recess, and the part of installing component is engaged with this protuberance or recess.

8. like each described chair in the claim 1～7, it is characterized in that,

The inner face of groove along the vertical direction across appropriate intervals be provided with a plurality of protuberances or recess; Part through making installing component optionally is fastened on this protuberance or recess, thereby the mode of alternative pack with the installation site that can regulate above-below direction is installed on the backrest.

9. chair as claimed in claim 8 is characterized in that,

The installing component of alternative pack constitutes to have: select the side of parts to extend and surround the encirclement sheet of the side end of backrest laterally certainly; Be arranged at the elastomeric element of this encirclement sheet,

The engaging pawl of end that is arranged at up and down arbitrary side of said encirclement sheet leading section is entrenched in the groove of backrest and optionally is fastened on a plurality of protuberances or recess that are arranged at groove, can alternative pack be limited to backrest at a plurality of height thus,

And, utilize said elastomeric element with said installing component with respect to backrest to the direction application of force that said engaging pawl is engaged with protuberance or recess, move through making this active force of said alternative pack resistance, can said engaging pawl be broken away from from protuberance or recess.

10. like each described chair in the claim 1～8, it is characterized in that,

The leading section of said encirclement sheet and the arbitrary at least side in the elastomeric element are fastened in the groove of backrest, make and utilize the leading section of said encirclement sheet and the side end of elastomeric element clamping backrest from front and back.

11. like each described chair in the claim 1～10, it is characterized in that,

Alternative pack be the clothes hanger that is used for hanging clothes, headrest, handrail, lumbar support any or a plurality of.