CN101242756B

CN101242756B - Chair

Info

Publication number: CN101242756B
Application number: CN2006800300230A
Authority: CN
Inventors: 管智士; 浜克典; 樱井多弥男; 中村保弘
Original assignee: Itoki Corp
Current assignee: Itoki Corp
Priority date: 2005-08-18
Filing date: 2006-08-18
Publication date: 2012-04-25
Anticipated expiration: 2026-08-18
Also published as: CN101242756A; JP4856911B2; JP2007050121A

Abstract

A chair in which the front part of a seat (2) is connected to a base (6) through a front support link (7) and a first pivot shaft (8), and the rear part of the seat (2) is connected to a swing frame (11) through a rear support link (14). The first pivot shaft (8) is slidably fitted to the base (6). The upper part of a backrest (3) is mounted on the upper part of a back frame (212). When a person sits on the chair, the seat (2) is lowered and moved backward, and the lumbar support part (17a) of the backrest (3) is moved forward in conjunction with the movement of the seat (2). Accordingly, even if the person sits forward on the chair, the lumbar support can accurately support the waist portion of the person. An interlocking means comprises an interlocking link mechanism formed of first to fifth interlocking links (43), (46), (48), (21), and (20). The third link (48) can be reversely rotated against the elasticity of a second return spring (49). As a result, the person is not obstructed to sit backward on the seat.

Description

Chair

Technical field

The present invention relates to have the chair of backrest.

Background technology

There are various types of chairs, and carried out various improvement to these respective type.As an example, patent documentation 1 discloses a kind of chair, and wherein when the people who sits down leaned against on the chair, seat support turned forward.On the other hand, patent documentation 2 has been described a kind of chair, and wherein when the people sits down, seat support is shown the middle part greatly for centroclinal along direction forwards, backwards in its side view, and backrest is through tilting with the seat support routing motion that recedes.In two patent documentations, the device for being used to make backrest and seat support interlock has all adopted certain type linkage.

According to patent documentation 1, just when people's seat was on chair, seat support and backrest just kept its posture constant; Lean against on the backrest and work as the people who sits down; Thereby apply big moment when backrest, the rear portion of seat support is pushed upwardly, thereby under the effect of lever principle; Seat support is turned forward, and the purpose of its invention is to eliminate people's the constriction of thigh under swinging condition.

On the other hand, according to patent documentation 2, when the people is sitting on the chair more deeply; Very important person does not lean against on the backrest, and then the posture of backrest all remains unchanged, for example; When the people was sitting in seat support anterior, backrest tilted forward significantly, and people's back receives the top pushing of backrest.Then, the user gets under the state of falling forward, thereby feels unpleasant, so seated position moves backward.According to patent documentation 2, when being sitting in seat support anterior as the people, the happy sense of administration of human, the people can take correct sitting posture thus.Therefore, patent documentation 2 disclosed chairs can be called as a kind of plint.

Patent documentation 1:JP-B-44-20784

Patent documentation 2:JP-B-46-27517

Summary of the invention

Invent problem to be solved

For example, when the people used chair in office, the people must not be sitting on the chair more deeply, but is sitting on the chair often more shallowly.During the action of the posture that turns forward as the people, the people is sitting on the chair often more shallowly.Also has a kind of situation, wherein because people's health is less, so this people is difficult to be sitting on the chair more deeply.And somebody's custom is sitting on the chair more shallowly.

In either case, the fact all is that for the realistic model of using chair, the people is sitting on the chair often more shallowly.On the other hand,,, the lumbar vertebrae support section is set importantly, supports waist from rear side for the burden on the health that alleviates the people who sits down according to chair in recent years.That is to say that when supporting waist from behind, the people keeps being under the state that stretches muscle of back, and therefore, the burden of lumbar vertebrae and pelvis obviously reduces.Therefore, in recent years, have that lumbar vertebrae supports, as to be used for the concentrated people's of support lumbar portion chair and be developed.

But, when the people is sitting on the chair more shallowly, between backrest and waist, stay certain space, and therefore, the people presenting the state of bending over easily, the burden of lumbar vertebrae increases like this, causes flank pain, perhaps owing to the compressing internal causes stomach disorderly.

Therefore, need be a kind of to user friendly and advanced chair, when promptly the person who happens to be on hand for an errand is sitting on the chair more shallowly, also can realize the lumbar vertebrae support function.But patent documentation 1 has only expected waving situation, and does not provide any relevant more shallow consideration that is sitting on the chair.On the other hand, according to the chair of patent documentation 2, when the people was sitting on the chair more shallowly, the people was forced into the state of bending over, and therefore, the burden of user's waist obviously increases.Therefore, this chair is difficult to be applied to the chair of office.

Implemented the present invention, and purpose is to improve present this circumstances.

The means of dealing with problems

Chair of the present invention comprises as seat support and the backrest that can not save element.And; Seat support is supported by the seat support reception part; Thereby realize in the time of on the people is sitting in moving downward, at least a in motion and the banking motion backward; Backrest has constituted the lumbar vertebrae support section, and it can support the people's who sits down waist at place, its underpart, and backrest is connected in the back support frame with the more a large amount of state of lumbar vertebrae support section that can move forward.And chair also comprises linkage, is used for through letting the people be sitting in seat support, moves the lumbar vertebrae support section of the backrest that moves forward by seat support.

According to the present invention, the lumbar vertebrae support section of backrest is sitting on the seat support through the people and moves forward, and therefore; Be that the person who happens to be on hand for an errand is sitting on the seat support more shallowly, the people's who sits down waist (lumbar vertebrae) also can be supported the result from behind; Through stretching muscle of back, can adopt posture with less burden.

According to the present invention, in order to obtain to invent effect, the lumbar vertebrae support section of essential is backrest through the people be sitting in top move forward one more a large amount of, for axial dimension, preferably make chair move forward for example about 100 millimeters.And when seat support moved backward, preferably the summation with seat support size that moves backward and the size that the lumbar vertebrae support section is moved forward was set at about 100 millimeters.Nature, this numeral is a standard, also can adopt step by step (for example, 30 millimeters interval) to regulate the structure of the size of the lumbar vertebrae support section that moves forward relatively.Preferably, move forward the relatively size of lumbar vertebrae support section is at least about 50 millimeters.

The present invention includes by above-mentioned structure make up basic invention described below multiple modification.

(1) first modification

In first modification of the present invention; Seat support is supported by the seat support receiving portion; Moving downward at least, and can when the people is sitting on the seat support, change its posture in side view hardly, the amount that the lumbar vertebrae support section of backrest moves forward is at least the amount that moves downward in the seat support motion.And " changing hardly " of the present invention comprises immovable at all situation and situation about more or less changing.

Though according to above-mentioned patent documentation 2; Seat support turns forward on the people is sitting in more shallowly the time; Therefore and go wrong, promptly the people can occur bending forward and be difficult to stretch the situation of muscle of back, but according to first modification of the present invention; The attitude of seat support in side view changes hardly, and user's pelvis is remained in the stable state by seat support.Therefore, this chair is preferred as being used in the chair that uses in the office work, such as for example PC operation.And the present invention also comprises move forward the ordinatedly structure of lumbar vertebrae support section of backrest of turn forward motion or the motion that recedes with seat support.Can select to utilize which kind of motion of seat support,, and the lumbar vertebrae support section travelled forward ordinatedly through the use chair.

(2) second modification

Second modification of the present invention is applicable to rocking chair; The backrest of this chair recedes; This chair comprises the base that is arranged on chair leg upper end; Can the mode of receding being connected in the back support frame of base and being used for the swing spring that resiliency supported back support frame (rather than seat support and backrest) recedes and moves.

And seat support is supported by base and back support frame, so that move downward and recede motion; And can when the people is sitting on the seat support, change the attitude of seat support in side view hardly, and therefore the back support frame has also played the effect of seat support reception part and back support, and the elastic force of swing spring is set to such intensity; Promptly through this intensity; Be person who happens to be on hand for an errand when sitting down, swing spring is strain not also, but when the people who sits down leans against on the backrest strain.

In second modification of the present invention, when the people sat down, seat support moved down and moves backward, and therefore the lumbar vertebrae support section of backrest easily near people's waist.Therefore, accurately realized the lumbar vertebrae support function sitting under the more shallow situation in ground.And swing spring is only indeformable when sitting down, and therefore can also keep swing function securely, and can when more shallow sitting down, not hinder the lumbar vertebrae support function.

(3) the 3rd modification

Equally; In the 3rd modification of the present invention; Chair comprises the base that is arranged at chair leg upper end, can sweptback mode to be connected in the back support frame of base and to be used for the swing spring of the motion that recedes of resiliency supported back support frame (rather than seat support and backrest).

And; In the 3rd modification, through first connecting rod mechanism, seat support is connected in base and back support frame; So that move downward and motion backward; And can when the people is sitting on the seat support, change the attitude of seat support in side view hardly, and seat support receives spring compressing on the direction that moves upward, and the back support frame has second connecting rod mechanism; Being used for the moving backward and move downward travelling forward of the lumbar vertebrae support section that is transformed into backrest of seat support, and second connecting rod mechanism has constituted the core members of linkage.

Can adopt variety of way as the means that are used for when sitting down, moving seat support; And can carry out multiple research and development and be used to realize linkage; And at the mechanism that adopt to move seat support and linkage during as linkage; Obtain following advantage through simple structure, promptly can keep firm motion.

(4) the 4th modification

In the 4th modification of the present invention; Linkage comprises elastic device; The motion of seat support is transformed into the proal transferring elements of the lumbar vertebrae support section of backrest when sitting down as being used for, and allows proal lumbar vertebrae support section to overcome the elastic device effect to move backward.

The people always is seated more shallowly, but also has such a case, and wherein the people is seated more deeply.And the preceding/position, back when sitting down is diversified.Therefore and in the 4th modification of the present invention, the lumbar vertebrae support section that moves forward can overcome the elastic device effect and move backward, and the lumbar vertebrae support section can be maintained on the preceding/position, back according to people's seated position.Therefore, this variation is preferred especially.

And when the people moves the lower part of the body, when under the state that is sitting on the chair, moving backward, the lumbar vertebrae support section that moves forward overcomes the elastic device effect and moves backward more shallowly.But on the other hand, there is situation about just being seated more deeply, in this situation from beginning; Waist just contacts the lumbar vertebrae support section in the moment of sitting down; And therefore the lumbar vertebrae support section does not move forward, and perhaps moves forward hardly, and it is mobile to have only seat support to move down with backward.

The (5) the 5th and the 6th modification

The 5th modification of the present invention is characterised in that backrest; And according to the present invention; Backrest has flexibility, thereby can be by the people's who sits down compressing and make the side view shape and the plan view warpage of backrest, and the top of backrest is connected in back support; The lumbar vertebrae support section is connected in linkage, and the lumbar vertebrae support section is centroclinal and forward backward move with top through making backrest in side view.

The 6th modification is a preferred embodiment of the 5th modification; In the 5th modification of the present invention, according to the 6th modification of the present invention, backrest comprises backboard; It comprises synthetic resin (comprising artificial rubber), and in the front of backboard or back or two sides, front and back be formed with a plurality of vertical elongated ribs.

The the of the present invention the 5th and the 6th modification has obtained following advantage, promptly can improve the health degree of backrest for people's body.Particularly, construct (comprising artificial rubber) material of backboard through utilizing rubber material synthetic resin, the 6th modification of the present invention is excellent aspect health, and has guaranteed the flexibility in the human body contact.

Simultaneously, when the undue flexibility of backrest, what worried is the sensation that the people can feel a bit peculiar.That is to say that preferably backrest has rigidity to a certain degree.In this respect, when in the 6th modification of the present invention, forming a plurality of vertical elongated rib, reached so following state; Wherein through appropriate rigidity, kept the shape in the side view, thus can excessive deformation; While is in the plane of chair, thereby chair can easy deformation encase human body.Therefore, the 6th modification of the present invention is preferred especially.And, in the 6th modification of the present invention, backboard is come out (that is to say that chair cushion is not deployed on the backboard), in the case, obtain following advantage, promptly when the front at backboard formed the vertical elongated rib, permeability was excellent.

(6) the 7th modification

In basic invention, in the 7th modification of the present invention, backrest comprises flexible lumbar vertebrae support section, and it can be crooked, thereby in its side view, be out of shape, and main support section is set to from the lumbar vertebrae support section upwards and almost do not have a flexibility.And the main support section of backrest is connected in the back support frame, and the upper end of lumbar vertebrae support section is connected in support section or back support frame, and its lower end is kept movably.

And the lumbar vertebrae support section has the directionality of distortion, makes that one of lumbar vertebrae support section bending is more a large amount of, becomes outstanding shape, and in its side view, moves forward when its underpart moves up from below receiving extensional process.And the back support frame also has guiding device, the bottom of the lumbar vertebrae support section that is used for when the people sits down, moving up, and this guiding device constitutes the part of linkage.

According to the 7th modification of the present invention, when stretching force acted on the lumbar vertebrae support section, lumbar vertebrae support section strain become outstanding forward shape, and the lumbar vertebrae support section moved forward under the elasticity denaturation.And in the 7th modification of the present invention, the lumbar vertebrae support section moves forward when distortion, and therefore linkage becomes very simple.This point is the distinguishing feature of the 7th modification.

(7) the 8th modification

The 8th modification is a preferred embodiment of the 7th modification.The 8th modification of the present invention comprises the base that is arranged at chair leg upper end in the present invention's the 7th modification, can sweptback mode to be connected in the back support frame of base and to be used for the swing spring of the motion that recedes of resiliency supported back support frame.By means of guiding device; Seat support is supported by base and back support frame; So that move backward with move downward, and can when the people is sitting on the seat support, change the attitude of seat support in side view hardly, and therefore the back support frame has also played the effect of seat support reception part and back support.

And; Downward extension with flexibility is extended to the bottom of lumbar vertebrae support section; Its front end is connected in the rear portion of seat support, and the back support frame has leader, through leader; When seat support moved down and move backward, the downward extension of this of lumbar vertebrae support section moved to the main support section of backrest.The 8th modification of the present invention is made up of simple structure, and this structure is oppressed the downward extension of lumbar vertebrae support section through seat support, and therefore structure obtains further simplifying reliably.

(8) other modification

The present invention also comprises other modification.For example, first to the 6th modification also can combine.And, can also provide switching device shifter to be used for selecting: even if the state of the lumbar vertebrae support section of the backrest that moves forward when sitting down and when sitting down, the state that the lumbar vertebrae support section of backrest does not also move forward.Through the explanation of instantiation described below, can understand the present invention more exactly.

Description of drawings

Fig. 1 is the overall perspective view according to the chair of first embodiment.

Fig. 2 A is the front view of chair, and Fig. 2 B is the side view of chair.

Fig. 3 is the rearview of chair.

Fig. 4 is the partial plan of chair.

Fig. 5 is that part is cut decomposition view open, has shown the device that is used to support seat support.

Fig. 6 is the decomposition view that the line VI-VI from Fig. 5 sees.

Fig. 7 A is the part perspective view of base, and Fig. 7 B is the decomposition diagram that constitutes the parts of first connecting rod mechanism, and Fig. 7 C is the sectional view that under the state that connects seat support, obtains along the line VIIC-VIIC of Fig. 5.

Fig. 8 is the decomposition diagram that constitutes the parts of linkage.

Fig. 9 is to be that the part at center is cut decomposition view open with the parts that constitute linkage.

Figure 10 A is that the part that constitutes linkage is cut exploded plan view open, and Figure 10 B is the decomposition section that the line B-B along Figure 10 A obtains, and Figure 10 C is the sectional view that obtains along the line C-C of 10A being integrated with under the situation of spring.

Figure 11 is to be the plan cross-sectional view at center with the parts that constitute linkage.

Figure 12 is to be that the part at center is cut decomposition diagram open with the parts that constitute linkage.

Figure 13 A is the sectional view that the line XIIIA-XIIIA in Figure 11 obtains; Figure 13 B is the sectional view that the line XIIIB-XIIIB in Figure 11 obtains; Figure 13 C is the sectional view that the line XIIIC-XIIIC in Figure 11 obtains, and Figure 13 D is the sectional view that the line D-D in Figure 13 obtains.

Figure 14 is the vertical cross-section that shows the motion of linkage.

Figure 15 is the decomposition side view that shows the structure that connects backrest.

Figure 16 is the rearview of backrest.

Figure 17 is abridged, the state lower part rearview that is connected in the back support frame at backrest.

Figure 18 is the sectional view that the line XVIII-XVIII in Figure 17 obtains.

Figure 19 is the decomposition plan cross-sectional view that the line XIX-XIX in Figure 16 obtains.

Figure 20 is the decomposition plan cross-sectional view that the line XX-XX in Figure 16 obtains.

Figure 21 is the sectional view that the line XXI-XXI in Figure 20 obtains.

Figure 22 is the sectional view that the line XXII-XXII in Figure 16 obtains.

Figure 23 is the architectural configurations view that shows seat support and back movement.

Figure 24 is the overall perspective view according to the chair of second embodiment.

Figure 25 is the side view according to the chair of the 3rd embodiment.

Figure 26 A is the side view according to the chair of the 4th embodiment, and Figure 26 B is the part zoomed-in view of Figure 26 A, and Figure 26 C is the partial cross section view of Figure 26 A.

Figure 27 is the decomposition diagram of the 4th embodiment.

Figure 28 is the sectional view that the line XXVIII-XXVIII in Figure 26 A obtains.

Figure 29 is the view that shows the motion of the 4th embodiment.

The explanation of Reference numeral and symbol

1 chair leg

2 seat supports

3 backrests

6 bases

Support link before 7

8 first back shafts

11 constitute the swinging mounting of the part of back support frame

12 constitute the back bracket of the part of back support frame

13 second back shafts

17 backboards

18, the rib of 19 backboards

20 5-linkeds are moved connecting rod

21 tetrads move connecting rod

31 swing spring

36 first recovery springs

41 accommodating boxes

42 driving shafts

43 first interlock connecting rods

46 second interlock connecting rods

48 the 3rd interlock connecting rods

49 second recovery springs

The specific embodiment

Below, with embodiment of the invention will be described with reference to drawings.Embodiment is applicable to the swivel chair of purposes such as office.At first, will first embodiment be described with reference to Fig. 1-2 3.

(1)-1 the main points of first embodiment

At first, will be with reference to the main main points of describing chair of Fig. 1-7.Chair comprises chair leg 1 and seat support 2 and backrest 3.Chair leg 1 comprises a component leg 4 and chair leg pillar (cylinder) 5 that extends with horizontal shape, and the upper end of chair leg pillar 5 with process by metallic plate, the base 6 of upward opening is connected.Shown in for example Fig. 5 and Fig. 7 C, seat support 2 comprises seat support inner housing (chair seat board) 2a, the chair cushion 2b that it is formed from a resin and launches in the above.

Know like Fig. 7 C to show that the front part of seat support 2 is connected in base 6 by first back shaft 8 of left and right sides front rod 7 and a left side/right transverse extension.Two pairs of fore-stocks 9 about the front portion of seat support inner housing 2a is formed be used for the left and right sides extruding connecting rod 7 of support link 7 in the past, and fore-stock 9 are connected with the mode that can be pivoted relative to each other by preceding pin 10 with preceding support link 7.In its front view, seat support 2 caves in step by step becomes a spill that makes progress.

The a pair of support 11 that swings has been arranged in the left and right sides of base 6; They are sweptback attitude in side view; And extend to the rear side of base 6, the rear end and the back bracket 12 of the support 11 that swings are fixed together, and be roughly rectangular in its rearview.In this example, like Figure 11 and shown in Figure 15, the rear end of swinging mounting 11 has bossing 11c, and bossing 11c is assembled in the hole (not shown) that is arranged at back bracket 12 places.

According to present embodiment,, constituted the back support frame described in the claim by swinging mounting 11 and back bracket 12.And swinging mounting 11 also can be made up of the structure of one with back bracket 12, and back bracket 12 also can be called the back pillar.

Swinging mounting 11 is connected in the rear portion of base 6 by second back shaft 13, thereby is that center back tilts with its fore-end.And the rear portion of seat support 2 and swinging mounting 11 couple together with the mode that can be pivoted relative to each other through back support link 14 about a pair of.Under neutral state, promptly under the state that the people does not sit down, preceding support link 7 is sweptback slightly attitude with back support link 14 in side view; And therefore when the people sat down, connecting

rod

7 and 14 receded, thereupon together; Seat support 2 moves backward; Move down simultaneously, and can change the attitude (perhaps, moving to parallel) in side view hardly along an oblique rear.

The rear portion of seat support inner housing 2a and a pair of left and right sides after-poppet 15 are integrally formed, be used for from its extruding back, left and right sides support link 14, and after-poppet 15 are connected through the vertical pin 16 in a left side/right side with back support link 14.Before support link 7 constitute a kind of parallel linkage with back support link 14, and the first connecting rod mechanism described in the claim promptly is made up of preceding support link 7 and back support link 14.The relation between back support link 14 and the swinging mounting 11 will be described in the back.

Backrest 3 only is made up of backboard 17, and backboard 17 has flexibility and is formed from a resin.Therefore, according to this embodiment, backrest 3 is restricted to identical with backboard 17.The front and back of backboard 17 has formed a plurality of vertical

elongated ribs

18 and 19, and they roughly are equidistantly (details that them will be described in the back).Backboard 17 becomes in its plane and is bent into the shape of depression forward in corresponding office, top and the bottom gradually.Under the situation of not sitting down, the lower end of backboard 17 is set near seat support 2, and the bottom of backboard 17 constitutes lumbar vertebrae support section 17a, and this part is bent into outstanding forward shape with progressive radius of curvature in its side view.

Backboard 17 is connected in back bracket 12 in the part place in the top with on-dismountable mode; On the other hand; The apex portion of lumbar vertebrae support section 17a is connected in the moving connecting rod 20 of the 5-linked that constitutes linkage; The end portion of lumbar vertebrae support section 17a is connected in the moving connecting rod 21 of the tetrad that constitutes linkage, and when seat support 2 moved down and move backward, lumbar vertebrae support section 17a moved forward significantly.

And 21 representatives of mark among Fig. 6 constitute the parts of locking devices 21, even if be used for when sitting down, also seat support 2 are remained on not under the mobile status.When have the people who always is sitting in the custom on the seat support when using more deeply, preferably, keep seat supports 2 not move through locking device 21.The details of various piece below will be described

(1)-2 the details of base peripheral part

At first, will mainly describe with base 6 with reference to Fig. 5-Fig. 7 be the structure of the part at center.As stated, base 6 forms the box-like of upward opening, and its inner and rear portion and reinforced liner 25 are permanently connected and are in the same place, and the upper end of chair leg pillar 5 is connected in lining 26 (referring to Fig. 5), and lining 26 is fixedly connected to base 6 and reinforced liner 25.

The fore-end of the left side plate of base 6 has the slotted hole 27 that in its side view, is square, and this slotted hole roughly slidably assembles up along the fore-and-aft direction and first back shaft 8.Slotted hole 27 assembles up with the lining 28 that is formed from a resin.Lining 28 and parts of bearings 29 assemble up with mode slidably from the outside and with rotatable, and the left and right sides parts of bearings 29 and first back shaft 8 assemble up, and first back shaft 8 is fixed in parts of bearings 29 through screw 30.Parts of bearings 29 is made of metal, and perhaps is formed from a resin.

The internal placement of base 6 two springs that swing (coil compression springs) 31; Be the attitude of extending along fore-and-aft direction, axle 8 and front spring receiving member 32 assemble up from rear side, on the other hand; Reinforced liner 25 is formed with and holds wall 25a, is used to support rear spring receiving member 33.Though therefore saved details because the spring receiving member is relevant hardly with the present invention; But rear spring receiving member 33 is made up of standing part and movable part; When the handle 34a that is located at control stick 34 places (with reference to Fig. 2 A) is operated with rotation; Movable part moves forward backward, and makes the initial elastic force of swing spring 31 change.

Preceding support link 7 comprises the cylindrical section 7a that is horizontal shape, and this cylindrical section 7a and above-mentioned parts of bearings 29 assemble up.Shown in Fig. 7 B, parts of bearings 29 comprise with rotatable be coupled to the projected square part 29a of lining 28 with mode slidably and touch with rotary way before the minor diameter cylindrical section 29b of cylindrical section 7a of support link 7.And the root of minor diameter cylindrical section 29b is formed with a pair of stop portion 29c, and they are along extending with the outward direction with the spaced apart state of minor diameter cylindrical section 29b.

This is disposed on the both sides of axis centre stop portion 29c, and the cylindrical section 7a of preceding support link 7 is formed with circular groove 35 (referring to Fig. 7 C), is used to allow the stop portion 29c certain angle (for example about 50 spend to 55 degree) that pivots.And the minor diameter cylindrical section 29b of parts of bearings 29 and first recovery springs 36 assemble up.First recovery springs 36 is torsion springs, and an end 36a who radially extends contacts with a stop portion 29c, the backstop hole 37 that the cylindrical section 7a place that the other end 36b that extends along the axis centre direction is assembled in preceding support link 7 forms.Backstop hole 37 forms non-annularity, thereby makes the other end part 36b of the recovery springs 36 of winning not mobile along circumferentially.

When the people sat down, preceding support link 7 overcame the elastic force of first recovery springs 36 and recedes, and when people's egress of chair, preceding support link 7 returns to original state under the elastic force of first recovery springs 36.When as present embodiment, when first recovery springs 36 is included in the preceding support link 7, obtain following advantage, that is, make chair compact, and be convenient to make chair integrated.Nature, support link 7 and seat support 2 turn back to kind and the position selection as required and arbitrarily of layout of the spring assembly of neutral state before being used to make.For example, also can below seat support 2 and between the base 6, arrange coil compression springs.

Support link

7 and 14 extends upward, and in its front view, is the attitude that direction tilts outside oblique.This is used for seat support 2 is supported under the stable status, this be because the left and right sides width dimensions of base 6 significantly less than the left and right sides width dimensions of seat support 2.Seat support 2 is supported by

support link

7 and 14 at its part place near right ends, and therefore, when the people sits down, allows seat support 2 distortion to become the shape that is bent into to lower recess.By flexural deformation, make seat support 2 have shock-absorbing capacity.

For example, as shown in Figure 6, pivot brackets 11 is assembled to the side plate of base 6 through lining 38.Second back shaft 13 is by screw or snap ring (not shown) and remain in the swinging mounting 11 with non-removable mode.The fore-end of pivot brackets 11 is formed with the vertical expansion 11a in preceding/back of upward opening.This expansion 11a is used to connect the armrest system (not shown).And pivot brackets 11 is processed by the for example metal of aluminum dipping form system product.Nature, also can adopt the seat support metal product, perhaps adopt the moulded resin product.And the support 11 that swings also can couple together in their rear end one.

(1)-3 the details of linkage (first)

Below, with the details of describing linkage.Roughly the latter half of linkage at first, will be described with Fig. 8-Figure 14.For example, as shown in Figure 8, the linkage of present embodiment comprises accommodating box (reception part) 41, and it is made of metal and upward opening; Driving shaft 42, be square and be assembled to not rotatable mode about back support link 14; The first interlock connecting rod 43 is assembled to driving shaft 42 with not relatively turnable mode about a pair of; The second interlock connecting rod 46 is connected to the first interlock connecting rod 43 by first pin 45; The 3rd interlock connecting rod 48 is connected to the second interlock connecting rod 46 by second pin 47; Tetrad moves connecting rod 21, with can the mode of being pivoted relative to each other be connected to the 3rd interlock connecting rod 48 on/middle part down; With the moving connecting rod 20 of 5-linked, be connected to the upper part of the 3rd interlock connecting rod 48 with the mode that can be pivoted relative to each other.

Moving connecting rod 21 of tetrad and the moving connecting rod 20 of 5-linked have been described above.According to present embodiment, the interlock linkage described in the claim constitutes to the moving connecting rod of 5-linked by first.

The second interlock connecting rod 46 is processed by metallic plate and is comprised top board 46a and left and right sides plate 46b, and the downside of top board 46a has been arranged second recovery springs 49.And second recovery springs has constituted the part of linkage.The details of each component parts will be described below.

Shown in for example Fig. 8 and Figure 13 A, through being left and right sides expansion 41b higher, accommodating box 41 is constituted as stepped differential shapes in its elevational sectional view, and left and right sides expansion 41a is fixed to the inside expansion 11b of swinging mounting 11 by screw 50.And the fore-end that constitutes the left side plate of accommodating box 41 is made up of the supporting part 41b that has circular hole, but and the minor diameter cylindrical section 14a of back support link 14 be assembled to supporting part 41b by lining 52 with the mode of pivots.

Though back support link is support link 7 before it is similar in appearance, back support link 14 has the concrete structure that is described below.At first, shown in Figure 13 D was clear, back support link 14 to be can not relatively rotating mode and above-mentioned driving shaft 42 assembles up, and driving shaft 42 is kept by back support link 14 by screw 53 on-dismountablely.Secondly; Back support link 14 comprises with the overlapping lap 14b of circular arc and the sunk part that is directed upwards towards 54; This circular arc is formed at swinging mounting 11 places, and this lap 14b is formed with stop portion 14c, is used for limiting range of pivot through contact swinging mounting 11.

Below, the first interlock connecting rod 43 will be described.The fore-end of the first interlock connecting rod 43 is formed with and cuts groove 43a, and it is assembled to first set bar 45.And the one side of the first interlock connecting rod 43 is overlapping with the guard block that is formed from a resin 55.Shown in for example Figure 10 A, guard block 55 covers the first interlock connecting rod 41, and the incision groove 43a of its fore-end and the first interlock connecting rod 41 is constituted as a form of bifurcation accordingly.Therefore, when the first interlock connecting rod 41 and the second interlock connecting rod, 46 cooperation pivots, can not send metal sound.

The first interlock connecting rod 41 has square hole, and it is assembled to driving shaft 42, and shown in Figure 14 B, guard block 55 is formed with the groove 56 of downward sensing, and it is assembled to driving shaft 42 from above.Therefore, protection part 55 is connected easily and is unloaded.And, preferably the first interlock connecting rod 41 is fixed to driving shaft 42, to wait it can't be moved therefrom through welding.

(1)-4 the details of linkage (part 2)

Below, the second interlock connecting rod 46 will be described.As for example from Figure 11 and Figure 13 B, can understand easily, the rear end part of the second interlock connecting rod 46 is connected in accommodating box 41 through back shaft 47.And the left side plate 46b that constitutes the second interlock connecting rod 46 comprises the extension 46c that points to forward, and first pin 45 slidably is assembled to the slotted hole 58 that forms at the 46c place, extension that points to forward.And slotted hole 58 is equipped with lining 46d, and it is formed from a resin, and is a bag shape (for example with reference to Figure 10 B, according to the accompanying drawing situation, omitting lining 46d).

First pin 45 assembles up with the incision groove 43a of the above-mentioned first interlock connecting rod 43.When the first interlock connecting rod 43 pivoted downwards, the second interlock connecting rod 46 was that the center pivots with back shaft 47, thereby its fore-end is moved down.And like what from Figure 13 B, can understand, the range of pivot of first pivot link 43 is restricted through the bottom surface of contact accommodating box 41.

The top board 46a of the second interlock connecting rod 46 is formed with downward sensing part 59 through cutting; Thereby top board 46a is raise; Cylindrical part 61 is connected to this by pin 60 and points to part 59 and a side plate 46b downwards; And cylindrical part 61 assembles up (and in Fig. 9 and Figure 10 A and Fig. 8, the position that is used to form the hole of downward sensing part 59 is opposite indication at left and right directions) from the outside and second recovery springs 49.Second recovery springs 49 is torsion spring (English P24), and an end parts 49a and two all radially extensions of other end part 49b.And like clear demonstration the among Figure 13 B for example, the top board 46a of an end parts 49a of second recovery springs 49 and the second interlock connecting rod 46 is from descending side contacts.

On the other hand; The 3rd interlock connecting rod 48 is connected in accommodating box 41 through above-mentioned back shaft 57; And; The lower end of the 3rd interlock connecting rod 48 is formed with the ledge 48a of sensing forward, and this of the other end part 49b of second recovery springs 49 and the 3rd interlock connecting rod 48 points to ledge 48a forward and contact.And like clear demonstration the among Figure 13 B, the ledge 48a that points to forward of the 3rd interlock connecting rod 48 is formed with the sunk part 62 under shed, and sunk part 62 is assembled to pin 63, and pin 63 gets up the left side plate 46b bridge joint of the second interlock connecting rod 46.

When the second interlock connecting rod 46 pivoted downwards, the 3rd interlock connecting rod 48 was that the center turns forward with back shaft 47.And, since the 3rd interlock connecting rod 48 point to the compressing that ledge 48a only receives second recovery springs 49 forward, the 3rd interlock connecting rod 48 that therefore turns forward can recede through the elasticity that self overcomes second recovery springs 49 (pivot returns).And, can also be that the 3rd interlock connecting rod 48 does not turn forward, and just the second interlock connecting rod 46 pivot downwards.

Below, with the part on the top of describing the linkage relevant with backrest 3.Also will provide explanation with reference to the accompanying drawing after Figure 15 and Figure 15.As stated, linkage comprises moving connecting rod 21 of tetrad and the moving connecting rod 20 of 5-linked.For example, like Figure 15 and shown in Figure 19, on moving connecting rod 21 of tetrad and the 3rd interlock connecting rod 48/following middle part is connected with the end portion of backboard 17.

On the moving connecting rod 21 of tetrad and the 3rd interlock connecting rod 48/middle part is sold 64 and is coupled together (with reference to Figure 14) through a left side/right side is vertical down.On the other hand, the lower end of a left side/right middle of backboard 17 is extruded with a pair of left and right sides lower support part 65, pushes the moving connecting rod 21 of tetrad from its left and right sides, and the moving connecting rod 21 of tetrad and lower support part 65 are sold 66 and coupled together (with reference to Figure 14) through a left side/right side is vertical.

Though the left and right sides width dimensions of the moving connecting rod 21 of tetrad is less; Shown in figure 19; But the moving connecting rod 20 of 5-linked has bigger left and right sides length; This length is slightly less than the left and right sides width dimensions of backboard 17, and the moving connecting rod 20 of 5-linked constitutes one in the arc shape of pointing to forward in the concave shape that bends in its plane.And like Figure 14 and shown in Figure 15, a left side/right middle of the moving connecting rod 20 of 5-linked has a pair of left and right sides bearing support 67, the upper part of bearing support 67 and the 3rd interlock connecting rod 48 through about vertically sell 68 and couple together.

And each all is formed with three supporting members 69 (in Fig. 8, only having shown two supporting members 69) left and right end portions of the moving connecting rod 20 of 5-linked.The left and right end portions of the lumbar vertebrae support section 17a of backboard 17 all is extruded with two upper support framves 70, and upper support frame 70 is assembled to the supporting member 69 of the moving connecting rod 20 of 5-linked, and upper support frame 70 and supporting member 69 through about vertically pin 71 couple together.

Backboard 17 is connected by the state that the moving connecting rod 20 of 5-linked supports with its two ends.Therefore, allow the lumbar vertebrae support section 17a distortion of backboard 17, so that under the effect of the people's who sits down body pressure, in plane, sink to the back.

(1)-5 backboard

Below, with the syndeton on the structure of describing backboard 17 and its top.As stated, backboard 17 forms through the material done by rubber material synthetic resin of structure, and it has flexibility, and under the flexibility effect, backboard 17 can the obvious flexural deformation through adult hand under the situation of single parts.Under the situation of single parts, side view shape and plan view shape can all be held backboard 17 and toward back plate 17 application of forces and obviously distortion through two hands of people.Provide the flexibility of above-mentioned degree.

And; The front-back of backboard 17 all is formed with a plurality of vertical

elongated ribs

18 and 19; For example as can see from Figure 20 and Figure 22 that these ribs 18 are arranged to 19 group: along with holding the height increase of rib about advancing to from a left side/right middle; And like what from Figure 15, can see, the group of rib 18 is arranged to: height increases near the apex portion of lumbar vertebrae support section 17a.Therefore, the lumbar vertebrae support section 17a of backboard 17 gets into a kind of like this state, and in this state, its side view can not change a lot, but sees easy deformation from the plane.

According to present embodiment, front and back

rib

18 and 19 is formed at identical position (therefore, backboard 17 also helps in plane, to be out of shape) in Ping Tutu (or rearview).And the rib group 18 of front and the rib group 19 of back are roughly to form near state symmetrical on fore-and-aft direction.Nature, the rib 18 of front and the rib 19 of back can form through moving along left and right directions.

When forming rib 18 with the front, the spacing of rib 18 is set to for example about 15 millimeters small size.Therefore, when promptly convenient human body was directly supported by backboard 17, the people can not feel the sensation of wondering yet.And

rib

18 and 19 thickness are set to the size with the degree that is of uniform thickness of backboard 17.

For example, like what from Figure 18, can understand easily, the top of backboard 17 is formed with the coupling part 17b that bends to the concave shape of pointing to backward, and the top 12a of back bracket 12 is assembled to coupling part 17b from rear side.The coupling part 17b of backboard 17 and the top 12a of back bracket 12 keep with inseparable mode through for example screwing.Backboard 17 can be the top 12a that centroclinal state is connected to back bracket 12 with its top also.

Therefore according to present embodiment, the top 12a of back bracket 12 extends near the left and right end portions of backboard 17, and the top of backboard 17 is indeformable in plane.Because when the backboard excessive deformation, the bad stability of human body and the obvious variation of the comfort that is seated are so the top of backboard 17 is roughly along all being supported by back bracket 12 on the whole length of left and right directions.

Though exist the people who sits down under the state of waist contact backrest 3 (backboard 17), to take the situation that sways one's hips and move; But allow backboard 17 part distortion downward from the middle part; Make left and right end portions break away from; Therefore move to rear side, and when swaying one's hips with transverse guidance above the waist, backboard 17 is followed people's motion easily and is out of shape.Therefore, the present invention is excellent on matching property.On the other hand, the top at back is by the upper support of indeformable backboard 17, and therefore the stability of health is guaranteed.

(1)-6 sums up

Figure 23 has shown total situation of the motion of above-mentioned chair.That is to say that when the people sat down, front and

back support link

7 and 14 receded, move down simultaneously and seat support 2 is mobile backward.And; Through cooperation recede back support link 14 and rotating driveshaft 42; The first interlock connecting rod 43 recedes; Thereby the pivot of the first interlock connecting rod 43 passes to the 3rd interlock connecting rod 48 through the second interlock connecting rod 46 and second recovery springs 49, and the 3rd interlock connecting rod 48 is turned forward.Thus, the lumbar vertebrae support section 17a of backboard 17 moves forward.According to present embodiment, the mobile backward size of seat support 2 is set to the size that moves forward of lumbar vertebrae support section 17a, and is about 50 millimeters.

Only sit down through the people, back bracket 12 does not recede, and therefore, the upper part of backboard is keeping by move mode.And the lumbar vertebrae support section 17a of backboard 17 is made into and can moves forward through moving connecting rod 21 of the tetrad that pivots and the moving connecting rod 20 of 5-linked.

The lumbar vertebrae support section 17a of backboard 17 is through being that center pivot backboard 17 moves forward with the upper part.Therefore, lumbar vertebrae support section 17a trends towards increasing height simultaneously moving forward.Though under the neutral state that the people does not sit down; Lumbar vertebrae support section 17a obviously is arranged on the downside; But when the people sits down; Seat support 2 moves backward, and lumbar vertebrae support section 17a becomes higher simultaneously moving forward, and lumbar vertebrae support section 17a is set on the optimum height of the lumbar vertebra (particularly the 3rd joint lumbar vertebra) that supports the people that contact sits down thus.

The 3rd interlock connecting rod 46 can overcome the elastic force of second recovery springs 49 and recede; And therefore allow under the more shallow situation about being seated of people, to move backward; And allow through from beginning with regard to sitting down more deeply only downwards with move seat support 2 backward, and the backboard 17 that need not to move forward.This point was described.

Simultaneously, in rocking chair, in the time of on leaning against backrest, the phenomenon of turning on the so-called shirt often occurs, this is because people's the buttocks and the position of seat support keep constant against each other, and that seat support and backrest trend towards is separated from one another.

In contrast; According to present embodiment, when the people who sits down leans against 17 last times of backboard, the moving connecting rod 21 of tetrad and the moving connecting rod 20 of 5-linked trend towards in side view pivot downwards; Backboard 17 trends towards to extending below; And therefore, can prevent the phenomenon of turning on the shirt, and the increase of the relative distance through preventing or limit seat support 2 and the backboard 17 this phenomenon that received significant limitation.This point is the advantage of present embodiment.

According to present embodiment, through accommodating box 41, each parts that constitute linkage are turned to one through these parts of primordial by the unit.Therefore, through before integrated and the parts that constitute linkage are carried out blocking and accommodating box 41 is fixed to swinging mounting 11, the linkage of blocking (interlocking equipment) can connect and unload.Therefore, chair can combine easily, and the motion of each interlock connecting rod also becomes steady.This point also is the remarkable advantage of present embodiment.

(2) second embodiment

Figure 24 has shown the outward appearance of second embodiment.Present embodiment is the improvement instance of first embodiment, and itself and the first embodiment difference only are that back inner housing 3a that backrest 3 is formed from a resin and the chair cushion parts 3b that on its front, stretches constitute.

Though back inner housing 3a also can consider cost by the resin manufacture of the artificial rubber that comprises the backboard 17 that is similar to first embodiment, preferably adopts the resin of common purpose, such as polypropylene.As flexible method is provided, can take for example to form a plurality of left and right sides transverse extension slits when the resin (such as polypropylene) that adopts common purpose is used for the back inner housing.

(3) the 3rd embodiment

Figure 25 has shown the 3rd embodiment.And, though used present embodiment first to the 3rd the interlock connecting rod technical term, these technical terms are specific for present embodiment, with first embodiment and inconsistent.

According to present embodiment, backrest 3 is constituted as a kind of structure that chair cushion parts b is expanded to the front of back inner housing 3a.And according to present embodiment, intermediate member 75 is connected in first back shaft 8 and back support frame 74 with the mode that can be pivoted relative to each other, and intermediate member 75 couples together with front and back support link 7 and 14.Intermediate member 75 is connected through the 3rd back shaft 76 with back support frame 74.

And, being furnished with reinforcement feature 77 below the seat support 2, it is processed by rigid body, and the upper end of front and

back support link

7 and 14 is connected in reinforcement feature 76.Therefore,

support link

7 and 14 smooth and easy pivots, and the influence that not be out of shape by the seat support inner housing.Intermediate member 75 is constituted as in its front view the form under shed.Omitted spring such as swing spring.

At back support frame 74 places; The first interlock connecting rod 78 and the second interlock connecting rod 79 of showing horizontal shape extension greatly couple together through common axis 80, and the bottom of the lumbar vertebrae support section 3c of the upper end of the second interlock connecting rod 79 and back inner housing 3a couples together through the 3rd interlock connecting rod 81.

The fore-end of the first interlock connecting rod 78 is formed with slotted hole 82, and this slotted hole 82 slidably assembles up with the directing pin 83 that place below seat support 2 is provided with.And the first interlock connecting rod 78 extends back from axle 80, and its rear end and the second interlock connecting rod 79 on/down the middle part couples together with the mode that can be pivoted relative to each other through scalable cylinder 84.Cylinder 84 discharges from lock-out state usually, and can freely stretch.

According to present embodiment, when seat support 2 moves when moving down simultaneously backward, under the state of Figure 25, the first interlock connecting rod 78 is along counterclockwise pivoting.Then, the lumbar vertebrae support section 3c of backrest 3 receives the contention effect of the second interlock connecting rod 79 and cylinder 84 and moves forward.And the second interlock connecting rod 79 can be independent of compressing and shrink cylinder 84 and return to initial attitude.Cylinder 84 is instances of elastic device, and it also can be replaced by wind spring.

Top 74a and its underpart of back support frame 74 are left, and top 74a links to each other through wind spring 85 with the bottom.Therefore, the top 74a of back support frame 74 can overcome the elasticity of wind spring 85 and tilt forward or backward.According to present embodiment, backrest 3 is holding downward part place to a certain degree to be connected in back support frame 74 from it.

(4) the 4th embodiment

Below, will the 4th embodiment be described with reference to Figure 26-29.According to present embodiment, chair comprises the intermediate member 75 that is connected in first back shaft 8 and back support frame 74.This point is identical with the 3rd embodiment.

Deflector roll 87 (can be slide block) with left and right sides longitudinal rotating shaft is outstanding from the rear and front end parts transversely of middle parts 3.On the other hand; Be formed from a resin (can be made of metal) and supporting plate 88 that be the plate shape at the lateral surface place that is arranged on intermediate member 75 be arranged on below the seat support 2 be positioned at left and right sides part and two before/the part place of rear section, and deflector roll 87 is assemblied in supporting plate 88 places and forms and in side view, be in the bullport 89 of the shape that recedes.Therefore, seat support 2 can move down and move backward, and can not change the attitude in its side view.

Backrest 3 comprises main support member 3d and the lumbar vertebrae support section 3c that arranges from main support member downwards.Lumbar vertebrae support section 3c is made up of the part that can be out of shape, and the shape of this part can be out of shape in its side view.And back support frame 74 is made up of left and right arms 74a and back, the left and right sides pillar 74b that is attached thereto, and left and right arms constitutes the front portion of back support frame 74, and the main support member 3d of backrest 3 is fixed in the top of back pillar 74b.The chair leg is the form identical with the chair leg of first embodiment.

The main support member 3d of backrest 3 is constituted as chair cushion is expanded to the structure (can not having chair cushion) on the front of upper inner case.On the other hand, lumbar vertebrae support section 3c comprises resin plate (lower inner case of being processed by polypropylene etc.) 90 as critical piece, and chair cushion 91 expands on the front of resin plate 90 at resin plate 90 contact people's part place.Nature, chair cushion can save, and as the device that is used for softening sense of touch to the people, also can expand the rubber material material of artificial rubber etc.And, also can adopt metallic plate, such as spring leaf, replace resin plate 90.

Show that as Figure 26 B is clear the upper end of resin plate 90 is connected in the support member 92 that is provided with at the back side of the end portion of main support member 3d through articulated elements 93.Therefore, resin plate 90 can be that the center pivots along fore-and-aft direction with its upper end easily.Support member 92 can be integrally moulded with the inner housing of main support member 3d, perhaps can be made up of the parts that separate with inner housing.And the upper end of resin plate 90 can be connected in back pillar 74b.

Resin plate 90 comprises the extension 90a of the downside that extends to seat support 2, the front end of extension 90a be connected in seat support 2 the rear portion below.That is to say; Shown in Figure 26 C; Through left and right sides longitudinal rod 95 being connected in a plurality of left and right sides supporting part 94 that the place forms below the seat support inner housing; And the fore-end of extension that makes resin plate 90 is around longitudinal rod 95, and the front end of the extension of resin plate 90 forms cylindricality, and this cylindricality state is kept by screw.Therefore, the front end of the extension 90a of resin plate 90 can be that the center pivots with bar 95 easily.And, the front end of the extension 90a of resin plate 90 can through screw etc. be fixed in seat support 2 below.

Under the state of not sitting down, between the rear end of seat support 2 and back pillar 74b, constitute tangible spacing.And back pillar 74b couples together with guide member 96 regularly, and guide member 96 has and bending to concave shape on the diagonal upward direction, in its side view, looking up at the guide surface 96a of the rear end of (lookup) seat support 2.Guide member 96 is formed from a resin, and is fixed in back, left and right sides pillar 74b through screw is fastening etc., and is shown in figure 28.And back pillar 74 can have guide member 96 integratedly.

The part of the depressed part office that under the state of not sitting down, is arranged on guide member 96 at resin plate 90 back sides is fixedly connected with being block multistage limit deformation parts 97, and is perhaps integrally moulded with it.Limit deformation parts 97 are arranged between the left and right sides guide member 96, and therefore, and limit deformation parts 97 have also been realized the function that prevents that resin plate 90 from departing from left and right directions.Though resin plate 90 have limit deformation parts 97 this part be deformed into concave shape forward, this part can not be out of shape becomes outstanding forward shape.That is to say, the deformation direction property of resin plate 90 is provided through limit deformation parts 97.

The part of resin plate 90 between its upper end and guide member 96 bends to outstanding forward shape in side view, but just outstanding slightly.This is for inceptive direction property is provided, so that make resin plate 90 outstanding forward under the effect that the people sits down.Guided plate 96 can extend the upper part up to resin plate 90.

In above-mentioned structure, when the people sat down, seat support 2 moved backward and moves down simultaneously, and can not change the attitude in the side view, and along with the motion of seat support 2, the extension 90a of resin plate 90 is pushed to the end portion of guide member 96.Then; Because the length overall of resin plate 90 remains unchanged, thus outstanding forward by the resin plate 90 of operation stretching, extension, and the while is under the guiding function of the curved guide face 96a of guide member 96; Be bent to outstanding forward shape from the part place that guide member 96 makes progress at it, shown in figure 29.Thus, promptly the person who happens to be on hand for an errand is sitting in 2 last times of seat support more shallowly, and people's waist also can access the accurate support of resin plate 90 (lumbar vertebrae support section 3c).

In this example; Through making resin plate 90 have limit deformation parts 97, the part that resin plate 90 has limit deformation parts 97 keeps being in the straight line states in its side view, and therefore; Resin plate 90 bends to outstanding forward shape; Outstanding with positively, and be that person who happens to be on hand for an errand's body pressure acts on the resin plate 90, bending to forward, this shape of outstanding shape can not dissipate yet.That is to say that resin plate 90 bends to constant state under 97 effects of limit deformation parts, and curved shape remains unchanged.

Though be that convenient people is sitting in 2 last times of seat support more deeply, the outstanding forward identical amount of resin plate 90 is owing to resin plate 90 has flexibility; Even if therefore under the state that is seated more deeply; The people can not feel yet the compressing sensation, on the contrary, resin plate 90 positively cooperates waist.

Guarantee to be that the person who happens to be on hand for an errand sits down by different way for being used for, perhaps sit down more deeply, the means of the corresponding conformability during perhaps more shallow sitting down, the overhang forward of lumbar vertebrae support section 3c can be regulated according to the state that is seated automatically.For the means that are used to regulate, be out of shape in plane except making resin plate 90, can consider following means.

Just: (a) motion of leaving of the upper end of resin plate 90 is supported by the elastic device (not shown), and when applying to a certain degree or during bigger resistance, resin plate 90 overcomes the effect of elastic device and leaves on diagonal upward direction; (b) opposite with above-mentioned a; Between the lower end and seat support 2 that elastic device are arranged in resin plate 90; And resin plate 90 is left arrive the downside of seat support 2, when applying to a certain degree or during bigger resistance, even when seat support 2 slides, also prevented resin plate 90 distortion; (c) through can move backward or recede and by the motion backward or the sweptback state of elastic device supporting guide parts 96; Guide member 96 is connected in back support frame 74; When having applied pressure to a certain degree, prevented that resin plate 90 from moving forward; (d) appropriate section except contact people's the part of waist of resin plate 90 has buffer portion, and this part is deformed into outstanding shape or zigzag in its side view when external force becomes to a certain degree or is bigger.

Can otherwise realize present embodiment.For example, the deflection of deformable segment (such as resin plate 90) can be conditioned.For concrete regulating measure, can expect regulating the upper end of resin plate 90 or the position of lower end, perhaps can regulate when seat support 2 begins to slide the distance that acts on resin plate 90 up to stretching force.

(5) other embodiment

Except the foregoing description, the present invention can realize by different way.For example, be sitting in the device that moves seat support on the seat support through the people, for example can adopt the system that guide rail and roller are assembled up for being used for.

And; For the proal device that is used for the motion of seat support is changed over the lumbar vertebrae support section; This device is not limited to linkage; But can be, through moving down seat support pressure being acted on oil, the lumbar vertebrae support section is then by under the effect of compressed oil, being promoted by cylinder (piston).And, other examples for linkage, can be, when sitting down, seat support move downward the tensile force that is transformed into wire rod, and the lumbar vertebrae support section is pushed through the stretching wire rod.Nature, can use hydraulic pressure, wire rod and connecting rod.

And, use the swivel chair that the object of the invention is not limited to have caster, but the present invention can be applied to the chair of other types, such as the chair that comprises as the chair leg of frame structure.And the form of back support frame or material can freely be set as required.In the application's specification, the wherein part of disclosed the application embodiment in requiring the application of priority has been described just.This is in order to reduce to explain book, and the present invention includes all respective embodiments.

Claims

1. a chair comprises seat support and backrest,

Wherein seat support is supported by the seat support reception part; So as when the people is sitting on the seat support, to move downward, backward the motion and banking motion at least a motion; Backrest constitutes the lumbar vertebrae support section, and said lumbar vertebrae support section can support the people's who sits down waist at place, its underpart, and can make said lumbar vertebrae support section more a large amount of state that moves forward; Make said backrest be connected in back support

Except backrest and seat support, said chair also comprises the interlock unit, be used for being sitting in seat support through the people, and by the motion of seat support, the lumbar vertebrae support section of the backrest that moves forward,

Wherein seat support is supported by the seat support receiving portion, so that when the people is sitting on the seat support, carries out said moving downward at least, and can change the attitude of seat support in its side view hardly; And

The lumbar vertebrae support section of backrest moves forward through said at least the moving downward in the seat support motion.

2. chair according to claim 1 also comprises:

Be arranged at the base of chair leg upper end;

Can sweptback mode to be connected in the back support frame of base; With

The swing spring that is used for the motion that recedes of resiliency supported back support frame;

Wherein seat support is supported by base and back support frame, so that when the people is sitting on the seat support, carries out said moving downward and the said motion that recedes, and can change the attitude of seat support in side view hardly;

The back support frame is as said seat support reception part and said back support; And

The elastic force of swing spring is set to following intensity, and through this intensity, promptly the person who happens to be on hand for an errand sits down, and swing spring can strain yet, but after the people who sits down leans against on the backrest, strain takes place.

3. chair according to claim 1 also comprises:

Be arranged at the base of chair leg upper end;

Can sweptback mode to be connected in the back support frame of base; With

Wherein seat support is connected in base and back support frame, so that when the people is sitting on the seat support, by means of first connecting rod mechanism, carries out said moving downward and said motion backward, and can change the attitude of seat support in side view hardly;

Through said spring, seat support is oppressed on the direction that moves upward; And

The back support frame has second connecting rod mechanism, and it is used for the travelling forward of lumbar vertebrae support section that is transformed into backrest with motion backward that move downward with said seat support, and second connecting rod mechanism constitutes the core members of said interlock unit.

4. chair according to claim 1, the unit that wherein links comprises elastic device as transferring elements, is used for the travelling forward of lumbar vertebrae support section that when the sitting down motion of seat support is transformed into backrest; And

The effect that allows proal lumbar vertebrae support section to overcome elastic device then moves.

5. chair according to claim 1, wherein backrest has flexibility, can the side view shape and the plan view shape of backrest deformed through the people's that sat down compressing;

The top of backrest is connected in said back support, and the lumbar vertebrae support section is connected in said linkage; And

Through make backrest with said top be the center in its side view medium dip, thereby make forward and the backward motion of lumbar vertebrae support section.

6. chair according to claim 5, wherein backrest comprises backboard, said backboard comprises synthetic resin, synthetic resin comprises artificial rubber, and in the front of said backboard or back or place, front and back form a plurality of vertical elongated ribs.

7. chair according to claim 1, wherein backrest comprises: flexible lumbar vertebrae support section, it can be bent, thereby in the side view of backrest, is out of shape; With main support section, it upwards is provided with from office, said lumbar vertebrae support portion and does not almost have a flexibility,

Wherein the main support section of backrest is connected in the back support frame;

The upper end of lumbar vertebrae support section is connected in the back support frame or goes up support section, and its lower end is kept movably;

The lumbar vertebrae support section has deformation direction property, thereby makes the bottom of lumbar vertebrae support section move upward through receiving from following extensional process;

The lumbar vertebrae support section is bent to outstanding shape more in large quantities, and in its side view, travels forward; And

The back support frame has guidance unit, the bottom of the lumbar vertebrae support section that is used for when the people sits down, moving up, and said guidance unit has constituted the part of said interlock unit.

8. chair according to claim 7 also comprises:

Be arranged at the base of chair leg upper end;

Can sweptback mode to be connected in the back support frame of base; With

The swing spring of the motion that recedes of resiliency supported back support frame;

Wherein seat support is supported by base and back support frame by said guidance unit, so that when the people is sitting on the seat support, carries out said motion and said moving downward backward, and can change the attitude of seat support in side view hardly;

Downward sensing extension with flexibility is extended to the bottom of lumbar vertebrae support section, and its front end is connected in the rear portion of seat support;

The back support frame has leader, and this leader makes the downward sensing extension of lumbar vertebrae support section move towards the said main support section of backrest when seat support moves downward and move backward.

9. chair according to claim 4, wherein said elastic device comprises wind spring.