CN103202620A - Chair - Google Patents

Abstract

Provided is a chair. A backrest (6) includes a back frame (13) opening in front and back, and a netlike member (17) stretched across the back frame. The right and left ends of the lumber support portion (17a) of the netlike member (17) are supported by a spacer (22) from the back. The spacer (22) is incorporated in a cavity (53) formed in a side member (14) and held at the upper end of a rear link (21) such that the height can be adjusted. At the time of rocking, upper end of the rear link (21) retreats relatively to the backrest (6) and thereby the spacer (22) retreats to loosen the netlike material (17) at the position of the lumber support portion. Consequently, push-up feeling of waist is eliminated in a rocking state.

Description

Chair

The application be submitted on May 29th, 2008, application number be 200880018258.7, denomination of invention divides an application for the application of " rocking chair ".

Technical field

The present invention relates to a kind of rocking chair that fascinates behind the chair back that makes.In detail, be with the chair back used the rocking chair of flexible back backrest and possess have can before and after any one party or both sides in the rocking chair of headrest of action be object.In addition, optimal material as so-called among the present invention " back backrest ", enumerate woven fabric or knitted fabric or its analog that the thin material by monofilament and multifibres and so on constitutes, can be as the material of " back backrest " but have flexible and can support the material of intensity of people's back.

Background technology

Aspect chair, patent documentation 1,2 illustrated for example, the chair back or seat adopt framework to be provided with the structure of the sheet material of netted (it is latticed also being said to), health by sheet material supporting seated person (is called the back backrest that has used netted sheet material " back plate: back sheet " in this manual, especially.）。Use the advantage of netted sheet material as seat, the chair back, can enumerate the good aspect of aeration or have elasticity and the good aspect of resiliency of appropriateness.

On the other hand, aspect chair, have recognized that the importance of the waist (the particularly part centered by third lumbar vertebra) that supports the user from behind in recent years, so, be provided with the side usually in the bottom of the chair back and see that outstanding forward waist is by portion.

And, used in the chair back of back plate at the chair back, also made the chair back have waist by function, under this situation, bend to the form of convex forward from the side by the height part that adopts the waist that in the afterframe that is provided with the back plate, makes the people who takes one's seat basically, thereby form waist by portion at the back plate.In order to bring into play waist better by function, also save land in the dorsal part adjustable height of back plate and be provided with waist by parts.Patent documentation 1 publicity be an example wherein.

On the other hand, aspect chair, also being widely current arranges the headrest of the head that supports the people who takes one's seat.As an example wherein, for example can enumerate patent documentation 3.In this patent documentation 3, headrest can change height and side-looking posture.

Patent documentation 1: TOHKEMY 2004-49658 communique

Patent documentation 2: TOHKEMY 2002-119366 communique

Patent documentation 3: TOHKEMY 2003-265264 communique

Why making the chair back of chair keep waist by function, is the posture that erects above the waist for the people who is easy to keep take one's seat, and therefore we can say at the non-state that shakes and uses under the situation of chair and need the waist of the chair back by function.

And, shaking under the state, the people can loosen under the state that backbone is stretched naturally the most, but the chair back has used the band waist of back plate by the chair of function, when shaking state and the non-section shape that shakes the back plate under the state and compare, for shaking state and non-ly shaking that shape does not have difference under the state in essence, the degree of the slight deformation that the elongation that causes because of user's body weight pressure causes.Therefore, even also continue the performance waist by function shaking under the state, thus, shaking the jack-up sense that is subjected under the state waist sometimes.

On the other hand, headrest can use with shaking under the state two states at the non-state that shakes, and in the past, whether no matter shake, the relative position of the chair back and headrest (posture) all was certain.Can have a rest for the health that makes the user and adopt under the situation of shaking posture, even headrest and the constant problem that also do not have of relative position of the chair back, but under shaking state, watch the screen (screen of the monitor of saying so exactly) of PC or will have problems when reading.

Namely, the people uses under the situation of PC at office, family, sometimes only watch screen under the state or operate with mouse shaking, but see screen in order under nature, to open eyes, the state that head is erected, relative therewith, by shaking when making headrest with chair back hypsokinesis, user's head becomes state upwards, therefore, the user sees screen just must make to direct one's eyes downward at head rest and sees under the state of headrest, as if continuing to look down for a long time, then will make eyes very tired.However, for seeing that screen just must make head erect so that the mode of sight line towards the front of face opened eyes under nature, when head is erected, owing to leaving headrest, head causes neck fatigue.Though also can shake under the state reading or browse data,, head is erected, therefore cause the fatigue of neck.

Summary of the invention

Main purpose of the present invention is to improve the current chairs that does not have problems and have problems under the state of shaking when non-shaking.In addition, present patent application comprises the structure of the improvement that does not have at present, and these new structures can be clear and definite by embodiment.

Chair of the present invention possess behind seat that the people takes a seat, the people on occupying described seat by the time elastic resistance of opposing elastomeric element and the chair back that fascinates after carrying out, and behind the described chair back, fascinate action and power be delivered to the chair back or near the auxiliary drive unit of portion it.Described auxiliary drive unit constitutes feature of the present invention, this auxiliary drive unit has the effect of following active any one or two kinds: for flexible back backrest is arranged under the situation of the structure on the afterframe, make the effect of the tension recovery of back backrest at the described chair back by fascinating behind the chair back; With under situation about headrest being installed on the described chair back, with respect to fascinating behind the chair back, make the effect of the forward travel relatively of resting the head on.

The present invention is main structure with described structure, and this main structure can be launched into many variations.First kind of variation is, the described chair back has the structure of flexible back backrest for the afterframe setting at the front and back opening of the profile that constitutes this chair back, by described auxiliary drive unit, when after making the chair back, fascinating, obtain relaxing at the tension force of left and right directions on the whole height of back backrest or on the height and position of part.

Second kind of variation is, in described main structure, the described chair back has the structure of flexible back backrest for the afterframe setting at the front and back opening of the profile that constitutes this chair back, and on the afterframe that constitutes the described chair back, headrest can be installed the front and back action, when behind the chair back, fascinating, by described auxiliary drive unit, on the whole height of back backrest or on the height and position of part, the tension force of left and right directions obtains relaxing, and headrest relatively carries out forward travel with respect to the chair back.

The third variation is, on the basis of first kind and second kind variation, described back backrest is latticed or netted structure, this back backrest is the most outstanding by portion with the people's who takes one's seat the contacted waist of waist, that sees from the vertical profile side is shaped as convex curvature forward, and then, by described auxiliary drive unit, when fascinating after making the chair back, the height and position of back backrest centered by leaning on portion by the waist tension force of left and right directions at least obtains relaxing.

The 4th kind of variation is, on the basis of first kind of variation, described afterframe has the curb girder of the lengthwise that constitutes afterframe left and right sides sidepiece and constitutes the back timber of roughly growing crosswise on top, in described curb girder, dispose from the movable support body of the left and right sides sidepiece of the described back of dorsal part supporting backrest by the position of described waist by the height and position centered by the portion, to carry out setback by fascinating behind the chair back, described movable support body constitutes the part of described auxiliary drive unit.

The 5th kind of variation is, on the basis of the 4th kind of variation, but possess kiss the earth and have the leg of pin pillar, the base that is fixed on the top of described pin pillar, and the rocking arm that is connected with described base of hypsokinesis ground, described seat is connected with base and rocking arm, to retreat with the afterframe hypsokinesis and hypsokinesis, on the other hand, described auxiliary drive unit has described movable support body is installed on master connecting-rod on the upper end, and described master connecting-rod is connected with rocking arm with seat and is set to according to the ratio hypsokinesis bigger than the chair back.

The 6th kind of variation is, on the basis of the 5th kind of variation, described headrest is installed on the upper end of last connecting rod of the dorsal part that is disposed at the chair back, the described connecting rod of going up is to be connected with the curb girder of afterframe rotationally before and after centered by the part of its lower end, upper end by making master connecting-rod is pressed close to go up the part of the below of rotating fulcrum the connecting rod from side nearby, utilize master connecting-rod after fascinate headrest advanced.

The 8th kind is changed to specializing of main structure, the chair of the 8th kind of variation possesses: but kiss the earth and have the pin pillar leg, be fixed on the rocking arm that the base hypsokinesis ground on the top of described pin pillar is connected with described base, described seat is connected with base and rocking arm, to retreat and hypsokinesis with back backrest hypsokinesis.

And, described auxiliary drive unit has the master connecting-rod that is connected with rocking arm with described seat, master connecting-rod is set to according to the ratio hypsokinesis bigger than the chair back, described headrest is installed on the upper end of last connecting rod of the dorsal part that is disposed at the chair back, the described connecting rod of going up is to be connected with the chair back rotationally before and after centered by the part of its lower end, upper end by making described master connecting-rod is pressed close to go up the part of the below of rotating fulcrum the connecting rod from side nearby, allow to utilize master connecting-rod after fascinate headrest advanced.

In the application's claim and embodiment, for clearly represent direction used " front and back " " about " such word, this word is short of to be specialized, to be seated at the artificial benchmark on the chair.Therefore, when being benchmark with the opposed state of chair, front and back and about direction just in time opposite.

[advantage of main structure～second kind of variation]

Among the present invention, be to have under the situation of structure of flexible back backrest at the chair back, it is lax to utilize auxiliary drive unit that waist is leaned on, thereby can make become softness and applicability of people's health and contacting of back backrest very good.In addition, be equipped with at the chair back under the situation of headrest, utilize auxiliary drive unit that headrest is relatively advanced with respect to the chair back, thereby can support the state that erects for the head that makes the people who is in the state of shaking from behind, thus, can make the people under the state of opening eyes naturally, watch screen or the reading of PC.That is, can not cause the fatigue of eyes and neck, can shake operation and the reading of carrying out computer under the state.

In the present invention, make the back backrest lax and headrest is relatively advanced be optionally structure when shaking, but more preferably as second kind of variation, have both both.In addition, back backrest lax has the relaxing of lax and left and right directions (horizontal direction) of above-below direction (vertical direction), and from making the more reliable this point of the applicability of health, preferably lax (in fact at left and right directions at least as first and second kind variation, the relaxation phase mutual correlation of the lax and above-below direction of left and right directions, situation is that above-below direction is also lax when left and right directions is lax mostly.）。

[advantage of the third variation]

The third variation is, has waist by portion, and become waist when shaking state can be lax and not to the jack-up sense of people's waist at left and right directions by portion.Therefore, can guarantee the body bearing function of shaking under the state non-, and can obtain very good comfort/applicability under the state shaking.

[advantage of the 4th kind of variation]

Though make the lax means of the waist portion of leaning on to adopt various structures, but change like that in employing as the 4th kind and to utilize the setback of left and right sides movable support body and when making the structure that the waist portion of leaning on relaxes, because the back backrest is the state that is arranged on the afterframe, thereby make the back lax structure of backrest become fairly simple.In addition because the movable support body is positioned at the position of the left and right sides of back backrest, even thereby the back backrest be the transparent structure in front and back as mesh members, also can not make the movable support body very showy, so aesthetic appearance is good.

In addition, the 4th kind of variation is by being disposed at the left and right sides with the movable support body, no matter shaking under the state or only shaking under the state all with back back support health (movable support body not with people's Body contact) non-, consequently, when making the back backrest constitute the back plate that is constituted by mesh members, these advantages of applicability/resiliency/aeration are given full play to.

In the 4th kind of variation; become by the movable support body from pushing back, rear portion backrest; but when as the enforcement mode, guard block being set; because the pushing force of movable support body spreads widely by guard block and is delivered to the back backrest; put on the narrow position of backrest, back so prevent from exerting all one's strength, have the advantage that makes the back backrest keep high-durability.Therefore, the method for for example using the such mechanograph of polyurethane resin plate as the back backrest is disclosed.

The advantage of the 7th kind of variation [the 6th ,]

As the method that makes the 4th kind of movable support body action in the variation, also can use the metal wire that for example is inserted in sliding freely in the pipe, but, when adopting the 5th kind to change, owing to as long as therefore the additional master connecting-rod that forcibly moves with the action interlock of rocking arm and seat can utilize simple structure that the back backrest is relaxed reliably.In addition, when adopting the 6th kind to change, owing to the forward travel of the lax and headrest of realizing the back backrest by master connecting-rod, therefore, its advantage is, the good chair of the supporting functions of health when not only obtaining shaking, and can make it simple in structure.

[effect of the 7th kind of variation]

The method that headrest is advanced with fascinating interlock behind the backrest can have many, when still adopting the combination of master connecting-rod and last connecting rod as the 8th kind of variation, can utilize simple structure that headrest is advanced reliably.In addition, the advance amount that also has headrest can be set the position that the rotating fulcrum of connecting rod is gone up in selection simply.

Description of drawings

Fig. 1 is the side view of the chair of first embodiment;

Fig. 2 is the back view that omits the part of chair;

Fig. 3 is the side view under the state that parts are decomposed;

Fig. 4 A is the summary lateral view of the state that shakes of expression head rest device, and Fig. 4 B is the summary lateral view that has omitted the state that shakes of head rest device;

Fig. 5 A is the part side view of deciding what is right and what is wrong, and Fig. 5 B is the summary back view under the state that parts are decomposed;

Fig. 6 A is the rip cutting side view of chair, and Fig. 6 B is the rip cutting side view of the bottom of the chair back, and Fig. 6 C is the rip cutting side view on the top of the chair back;

Fig. 7 is the part of the portion plane of deciding what is right and what is wrong;

Fig. 8 is the plane that shakes the part at the position of using spring;

Fig. 9 is the IX-IX pseudosection of Fig. 7;

Figure 10 is the X-X pseudosection of Fig. 7;

Figure 11 is the approximate three-dimensional map of critical piece;

Figure 12 A is the front elevation of the part of the chair back 6, and Figure 12 B is the B-B pseudosection of Figure 12 A, and Figure 12 C is the C-C pseudosection of Figure 12 A, and Figure 12 D is the D-D pseudosection of Figure 12 A;

Figure 13 A is X III-X III pseudosection of Figure 12 A, and Figure 13 B is the side view of expression head rest device;

Figure 14 A is at the profile that shakes the major part under the state, and Figure 14 B is at the major part side view that shakes under the state;

Figure 15 is the exploded perspective view at the position centered by base in second embodiment;

Figure 16 is the exploded perspective view of the supporting structure of expression seat in second embodiment;

Figure 17 is the exploded perspective view at the position centered by base and rocking arm in second embodiment;

Figure 18 is the rip cutting side view at the position centered by base in second embodiment;

Figure 19 is the exploded perspective view at the position centered by rocking arm and afterframe in second embodiment;

Figure 20 is the exploded perspective view at the position centered by afterframe in second embodiment;

Figure 21 A is the exploded perspective view of afterframe, Figure 21 B is the B-B pseudosection of Figure 21 A, Figure 21 C is the C-C pseudosection of Figure 21 A, Figure 21 D is the D-D pseudosection of Figure 21 A, Figure 21 E is the E-E pseudosection of Figure 21 A, Figure 21 F is the F-F pseudosection of Figure 21 A, and Figure 21 G is the G-G pseudosection of Figure 21 A;

Figure 22 A is the decomposition front elevation centered by afterframe and rocking arm in second embodiment, and Figure 22 B is to be benchmark will be positioned at the rocking arm incision in left side along XX II among Figure 18-XX II sight line profile with the seated person;

Figure 23 A be in second embodiment by afterframe with shake exploded side figure centered by the framework, Figure 23 B is the B-B pseudosection of Figure 23 A under the state after the assembling;

Figure 24 A is the back view of the 3rd embodiment, and Figure 24 B is the schematic side elevational view of the 3rd embodiment, and Figure 24 C is the schematic Action Specification figure of the 3rd embodiment;

Figure 25 A is the approximate three-dimensional map of the 4th embodiment, and Figure 25 B is the general view of the effect of expression the 4th embodiment;

Figure 26 A is the schematic perspective view of the 5th embodiment, and Figure 26 B is the B-B pseudosection of Figure 26 A;

Figure 27 A is the schematic diagram of the variation of prior art, and Figure 27 B is the schematic diagram of the head motion of first and second embodiment.

Symbol description

1: leg device

2: pin pillar (cylinder)

3: base

4: seat

5: frame mounting

6: the chair back

7: head rest device

11: rocking arm

13: the afterframe that constitutes the chair back

14: the curb girder of afterframe

14a: curb girder to front curve

15: the back timber of afterframe

16: the bottom girder of afterframe

17: one of back backrest example i.e. the back plate

17a: the waist of back plate is by portion

21: the master connecting-rod that constitutes the critical piece of auxiliary drive unit

22: the movable support body that constitutes a part that drives auxiliary unit

93: guard block

The specific embodiment

Below, with reference to the description of drawings the embodiments of the present invention.Each embodiment is applicable to the swivel chairs that are used for office usefulness more.Fig. 1～Figure 14 represents first embodiment, and Figure 15～Figure 27 represents second～the 8th embodiment.Below, describe successively from first embodiment.

(1)-1, the summary of first embodiment

The summary of chair at first, is described with reference to Fig. 1～Fig. 5.As shown in Figure 1, the staple of chair possesses has: the leg device 1 with pin pillar 2; Be fixed in the base 3 of the upper end of pin pillar 2; Be disposed at the seat 4 of the top of base 3; A part is also used as the frame mounting 5 of the chair back 6; Be installed on the head rest device 7 on the chair back 6; And be disposed at the seat 4 about the outside armrest system 8.Armrest system 8 is selection, is fixed on the frame mounting 5.In addition, armrest system 8 is owing to thereby explanation irrelevant with the present invention are omitted.

Leg 1 possesses many branch's legs 9 of radial extension, is provided with Caster 10 at the front end of each branch's leg 9.Pin pillar 2 uses retractile cylinder, and therefore possessing has urceolus and inner core.Frame mounting 5 possesses in the left and right sides of base 3 the upwardly extending rocking arm 11 in front and back is arranged.Rocking arm 11 is connected with base 3 by first 12 according to the mode of hypsokinesis centered by its leading section.Rocking arm 11 has the front and back longitudinal part that leans forward a little with respect to level, and its rear end is formed with upwardly extending back of the body pillar 11a.About back of the body pillar 11a on by bolting the afterframe 13 of the profile (on every side) that constitutes the chair back 6 is arranged.

Afterframe 13 is for being similar to the shape of the quadrangle (roughly trapezoidal) of lengthwise basically, therefore, its formation comprise the left and right sides sidepiece that constitutes the chair back 6 lengthwise about curb girder 14, constitute the chair back 6 top roughly grow crosswise (horizontal) back timber 15, constitute the bottom girder of roughly growing crosswise 16 of the lower end of the chair back 6.In addition, by being set at afterframe 13, back plate 17 constitutes the chair back 6.Back plate 17 is netted or latticed profile.

The front portion of seat 4 and the front portion of base 3 are connected by front rod 18, and by fascinating behind the front rod 18, seat 4 can retreat and hypsokinesis.In addition, present 4 be provided with to the outstanding left and right sides guide finger 19 of rocking arm 11 by the rear portion on the other hand, leaves the pilot hole (slotted hole) 20 that confession guide finger 19 embeds slidably at left and right sides rocking arm 11 opposed medial surfaces.

And as shown in Figure 3, by the guide effect of front rod 18 and guide finger 19 and pilot hole 20, the interlock that fascinates behind seat 4 and the chair back 6, retreats and descends hypsokinesis together.Self-evident, the degree of seat 4 hypsokinesis is littler than the degree of the chair back 6 hypsokinesis.

For example shown in Figure 3, chair possesses to be had: the left and right sides master connecting-rod 21 that is connected rotatably with seat 4 and frame mounting 5; Also can be said to the left and right sides this movable support body 22 of movable support body 22(of the front of the upper end that overlaps left and right sides master connecting-rod 21 is the partition adjusting pad.）。Movable support body 22 is from the left and right sides sidepiece of dorsal part supporting back plate 17.Master connecting-rod 21 possess with rocking arm 11 roughly overlapping bottom 21a and from the rear end of rocking arm 11 the upwardly extending 21b of portion that holds up, be the shape that is bordering on the L word on the whole, connect bottom 21a and be connected with the curb girder 14 of afterframe 13 with the bight of holding up the 21b of portion, in being connected with 4 to upper process 21c of the front end formation of bottom 21a.

Because master connecting-rod 21 and movable support body 22 constitute the described auxiliary drive unit of claim, therefore when the chair back 6 hypsokinesis, fascinate relatively with respect to afterframe 13 in the top of the 21b of the portion of holding up of master connecting-rod 21, back plate 17 is relaxed at the position by 22 supportings of movable support body, and (details will be addressed below.）。

Head rest device 7 possess the people head contact headrest 23 and be equipped with this headrest 23 about go up connecting rod 24, about go up connecting rod 24 at an upper portion thereof by reinforced frame 25 connections of growing crosswise.About to go up the bottom of connecting rod 24 overlapping with medial surface on the curb girder 14 of afterframe 13, become the 24a of pivot branch, the upper end of the 24a of pivot branch by about the pin 26 of growing crosswise be connected with curb girder 14.

And, when the chair back 6 hypsokinesis, by master connecting-rod 21 lower end of the 24a of pivot branch is rearward pushed (details will be addressed below), thus, headrest 23 relatively advances with respect to the chair back 6.In addition, in Fig. 4 A, represented head rest device 7, but on Fig. 4 B, do not represented head rest device 7.

(1)-2, the details of head motion

Below, describe structure and the action at each position in detail with reference to the accompanying drawing below Fig. 6.The basic structure of the chair that the structure of base 3 and head motion are so at first, is described with reference to Fig. 6～Figure 10.Shown in Fig. 6 (A), base 3 forms hollow by the shallow case shape main body 28 of upward opening with bolting in the lid 29 under shed of the upper surface of case shape main body 28, as shown in Figure 7, flat shape narrows down on vertically backward a little in front and back, and (certainly, shape can freely be selected.）。

Pin pillar 2 embeds the rear portion of main body 28.First 12 from up and down by main body 28 and lid 29 clampings, the therefore outside outstanding shape bearing portion 30 of splitting about main body 28 and lid 29 are formed with.Leave between shape bearing portion 30 and the rocking arm 11 at interval splitting, therefore, the axle collar 31 is embedded first fulcrum 12.First fulcrum 12 can not be fixed on the left and right sides rocking arm 11 with relatively rotating.

Side nearby near pin pillar 2 in the main body 28 that constitutes base 3 is formed with downward recess 28a, in this recess 28a, by screwing in the fulcrum 32 of approximate vertical posture is installed, on the fulcrum 32 from above embed and have as shaking with the routine helical spring 33 of one of elastomeric element.And, on first 12, can not be equipped with from the spring bearer plate 34 of this first 12 arm shape that extends back with relatively rotating.The leading section of spring bearer plate 34 fascinates after the elastic restoring force that the chair back 6 is resisted helical springs 33 is carried out not become two trouble shapes from the top with shaking with the overlapping mode of spring 33 interferingly with fulcrum 32.

In the present embodiment, form circle for first 12, therefore spring bearer plate 34 is fixed by welding, pin and is fixed in first 12, but, for example also can make spring bearer plate 34 can not relatively rotate ground chimeric (this o'clock also is the same on first 12 fixed structure with rocking arm 11 with first 12 by the dihedral that makes first 12 to form section quadrangle etc.）。In addition, can carry out various specializing to form and the configuration mode that shakes with spring.As spring unit, can use torsion spring, leaf spring or torsion bar.

The front portion of the main body 28 that constitutes base 3 form be useful on connect front rod 18 about the tubular bearing 28b of portion that grows crosswise, by inserting second 35 of leading at this tubular bearing 28b of portion the bottom of front rod 18 is connected with main body 28.In addition, the tubular bearing 28b of portion also can be arranged at the left and right sides of main body 28 branch, separates second 35 about also can distinguishing.

For example Fig. 3, Fig. 6 (A), shown in Figure 9, seat 4 is opened the structure that is provided with cushion pad 38 for inner casing 37 being fixed on the resinous seat supporting mass 36 and at inner casing 37 upper surfaces.Seat supporting mass 36 for the left and right sides width that enters 11 on left and right sides rocking arm, possess downward side plate 36a.And the forward part of the left side plate 36a of present supporting mass 36 forms the preceding end bearing 39 of heavy wall, on this preceding end bearing 39 by about the 3rd 40 upper end that connects front rod 18 respectively of growing crosswise.In addition, the 3rd 40 can be connected with one.

Seat leaves on the supporting mass 36 for allowing seat inner casing 37 certain because of the sink big lightening hole 41(of distortion of people's body weight pressure, also can not have lightening hole 41, and perhaps seat 4 also can adopt network.）。For example in Fig. 9, depict the state that seat 4 is adjacent to for inner casing 37 and seat supporting mass 36 as, but in fact, present 4 and inner casing 37 and seat supporting mass 36 between major part leave the gap.

On the left side plate 36a of present supporting mass 36, be formed with downward tail-bracket 42 in the part near its rear end with the heavy wall shape, outwards give prominence to being provided with above-mentioned guide finger 19 in the lower end of this tail-bracket 42.On the other hand, as Fig. 7 and shown in Figure 10, on rocking arm 11, leave guide finger 19 chimeric pilot hole 20 sliding freely as described above.Rocking arm 11 is the metal work of cast aluminium and so on, is essentially the inboard hollow form that forms opening, and is provided with reinforcement at hollow bulb.

In addition, rocking arm 11 is the posture that leans forward with slow angle with respect to level from the side, and for example shown in Figure 10, and pilot hole 20 is seen in the side and is with respect to relatively the lean forward posture of some angles of rocking arm 11.Utilize the relation at the angle of inclination of such rocking arm 11 and pilot hole 20, present 4 carry out hypsokinesis/retreat/when descending, can obtain not having in ergonomics the comfortable use sense of sense of discomfort with the chair back 6 interlocks.

(1)-3, the details of auxiliary drive unit

Below, except top accompanying drawing, also describe the structure of the chair back 6, the tension adjustment unit of back plate 17 and the mechanism that leans forward that rests the head in detail with reference to the accompanying drawing below Figure 11.In the present embodiment, afterframe 13 is that material monolithic is shaped as single part with the resin, and convex (was for example represented to front curve with symbol 14a at Fig. 3 and Fig. 4 before the part that contacts with the people's who takes one's seat waist in the curb girder 14 became with slow curvature bending from the side.）。Therefore, example is opened the back plate of being located on the afterframe 13 17 and is possessed the waist of the convex forward of concentrating the waist that supports the people who takes one's seat by the 17a of portion as shown in Figure 6A.

Constitute back timber 15 and bottom girder 16 concavity bending backward from the plane of afterframe 13.Therefore, the left and right sides pars intermedia of back plate 17 is pulled rearward to be stretched, and consequently, convex curvature is (perhaps recessed backward to see back plate 17 from side grain.）。Therefore, back plate 17 is drawn into encirclement people's back and the shape of waist.See that from the rip cutting side waist leans on the 17a of portion convex curvature forward, and see concavity bending forward from side grain.

Back plate 17 is installed on the concrete grammar of afterframe 13 shown in Fig. 6 B, Fig. 6 C and Figure 12 B～Figure 12 D.Namely, in the present embodiment, as the installation method of back plate 17, the roughly full week that flat and elongated edge parts 45 with stiffness of appropriateness are fixed in the edge of back plate 17, edge parts 45 are embedded into be formed at each beam 14,15,16 of afterframe 13() the narrow groove 46 of outer peripheral face in.Edge parts 45 carry out under the state of the powerful back plate 17 that stretches of being embedded in of narrow groove 46, and therefore, edge parts 45 can not come off from narrow groove 46.

Example is also omitted edge parts 45, narrow groove 46 as shown in Figure 6A in the accompanying drawings sometimes.In addition, (this point is identical with existing product for the structure of can some elongations on left and right directions extending hardly at above-below direction for back plate 17.）。

For example intelligible like that from Fig. 3, the back of the body pillar 11a of rocking arm 11 extend to afterframe 13 protuberance forward near.And shown in Figure 11 and Figure 12 B, Figure 12 C, the back of the body pillar 11a of rocking arm 11 is the section L word shape roughly with interior plate 11b.

The curb girder 14 of afterframe 13 is fixed on the back of the body pillar 11a by Screw (not shown).In addition, the both ends, the left and right sides of the bottom of curb girder 14 and bottom girder 16 near own side-prominent, are formed with narrow groove 46 at this protuberance than the interior plate 11b that carries on the back pillar 11a.Therefore, on curb girder 14 and bottom girder 16, narrow groove 46 forms and carries on the back pillar 11a and do not cushion in succession state of ground.

In the present embodiment; the front and back longitudinal part of rocking arm 11 and back of the body pillar 11a split constitute; back of the body pillar 11a is embedded into the rear portion of the front and back longitudinal part of rocking arm 11 from the below, and fixing by Screw (not shown) (also can be the structure with rocking arm 11 and back of the body pillar 11a formation one.）。And, express as Figure 11, in the rear end of the front and back of rocking arm 11 longitudinal part by screw the fastening or integrally formed outstanding boss 47 that makes progress that is provided with the inner face that is close to back of the body pillar 11a.On the other hand, express as identical Figure 11, the back side portion that connects the bight of curb girder 14 and bottom girder 16 in afterframe 13 is formed with just in time the otch 48 chimeric with above-mentioned boss 47.

As mentioned above, master connecting-rod 21 possesses bottom 21a and holds up the 21b of portion.And, as Fig. 7 and shown in Figure 9, master connecting-rod 21 to upper process 21c by about grow crosswise the 4th 49 lateral surface with seat supporting mass 36 be connected, the bottom 21a of master connecting-rod 21 rearward extends along the medial surface of rocking arm 11.On the other hand, for example shown in Figure 12, the 21b of the portion of holding up of master connecting-rod 21 extends upward along the front of back of the body pillar 11a, therefore, is formed with the pod 53 that master connecting-rod 21 enters at the curb girder 14 that constitutes afterframe 13.

The bottom 21a of master connecting-rod 21 staggers with holding up about the 21b of portion.Therefore, for example Figure 11 expresses, and is formed with at the rear portion of the bottom of master connecting-rod 21 21a be used to making this rear portion enter the bending part 21d of the inside of rocking arm 11, and is formed with the peristome 50 of interfering with bending part 21d be used to avoiding at rocking arm 11.Thus, allow to fascinate interlock behind master connecting-rod 21 and the chair back 6 and rotate.

As can understanding according to Figure 11, master connecting-rod 21 is at bottom 21a and hold up the bight that the 21b of portion intersects, and is connected with the boss 47 of rocking arm 11 by the 5th 51.Be formed with pod 47a for the 21b of the portion of holding up of chimeric master connecting-rod 21 at boss 47.In addition, substitute bolt at the 5th 51, in addition, the interior plate 11b of back of the body pillar 11a leave be used to avoid with the 5th 51 interfere dodge hole 52.

The pod 53 of curb girder 14 spreads all over its whole and opening in the wings, and also opening forwardly of the position that movable support body 22 is installed.Movable support body 22 is resin system, is the shape of the approximate ellipsoidal of growing up and down from the side, sees the rectangle that is lengthwise from the front.In addition, be provided with the interior side-prominent 22a that handles knob to curb girder 14 in the bottom of movable support body 22.

And, be formed with the aft-opening gathering sill 55 of the 21b of the portion of holding up that embeds master connecting-rod 21 in the centre position, the left and right sides of movable support body 22, be formed with at the pars intermedia up and down of this gathering sill 55 and be protruding backward chevron brake 56 from the side.And, on the 21b of the portion of holding up of master connecting-rod 21, be formed with continuously up and down for a plurality of concavo-convex 57 of the selective chimeric triangle of the chevron brake 56 of movable support body 22.

Interior side-prominent pin 58 to curb girder 14 is installed in the upper end of the 21b of the portion of holding up of master connecting-rod 21, makes pin 58 be resisted against the lower end of the last connecting rod 24 of head rest device 7 from the place ahead.The last connecting rod 24 of head rest device 7 is seen from the front and is formed thin tabularly, is formed with the otch 59 of chimeric pin 58 in the lower end of last connecting rod 24.In addition, on the curb girder 14 of afterframe 13, also be formed with otch 60 for the setback that allows pin 58.

(1)-4, sums up

Shake under the state the non-of the chair back 6 not hypsokinesis, shown in Figure 13 A and Figure 13 B, to nearby side-prominent, therefore pressed to thruster nearby by the both ends, the left and right sides of the 17a of portion by the waist of back plate 17 than the front of curb girder 14 for movable support body 22, and on left and right directions powerful the stretching.Therefore, waist is seen the curvature minimum by the 17a of portion from the rip cutting side, and sees the curvature maximum from side grain.Therefore, can support people's waist reliably.

In addition, can catch handles knob makes the elasticity of movable support body 22 opposing back plates 17 and knee-action thus, can be regulated waist by the height and position on the summit of the 17a of portion.In addition, because movable support body 22 quilts pass through the tension force of back plate 17 and pushing backward, thereby movable support body 22 can not come off.

On the other hand, when the people who takes one's seat leaned against on the chair back 6 and fascinates after making the chair back 6, master connecting-rod 21 relatively fascinated with respect to afterframe 13, carry out setback so that hold up the upper end of the 21b of portion, so as shown in figure 14, movable support body 22 enters the pod 53 of curb girder 14 fully.Therefore, the waist of back plate 17 leans on the 17a of portion relatively to carry out setback with respect to the curb girder 14 of afterframe 13, and consequently, waist relaxes into the state of pushing elongation backward by the 17a of portion.

Therefore, from the rip cutting side, waist obviously becomes big (according to circumstances even may be stretched to flat) by the curvature of the bending of the 17a of portion, and presents people's back and the trend that waist is encased dearly by back plate 17.Therefore, can guarantee higher applicability/comfortableness.In addition, even under the state that movable support body 22 retreats, the pushing force that acts on backward to this movable support body 22 by people's body weight pressure, in addition, because back plate 17 has elasticity and also apply to a certain degree tension force under lax state, therefore the trouble that does not have movable support body 22 to come off.

In addition, as mentioned above, head rest device 7 pushes backward by the lower end that will go up connecting rod 24 with master connecting-rod 21, and headrest 23 is relatively advanced with respect to the chair back 6.

But, leaning on though possess waist in the patent documentation 2, this waist is by being to be configured under the state that the dorsal part of plate broadens significantly backward.On the other hand, even having certain difference also can see through dorsal part, back plate sees, therefore, as described in patent documentation 1, when the dorsal part of back plate disposes waist by parts, can see through the front and see it, in addition, though expose fully and as seen from dorsal part, waist is too showy by parts like this, and aesthetic property is not necessarily good sometimes.

Relative therewith, in the present embodiment, owing to be used for that height that waist leans on is regulated and the master connecting-rod 21 of tension adjustment is built in the curb girder 14 and can attracts much attention hardly, thereby chair becomes happy design as a whole, so aesthetic property is good.This point is the advantage of present embodiment.

In addition, as making the lax method of back plate, as patent documentation 1, leaning on component configuration in the structure of the dorsal part of back plate in waist, though also consider and make waist lean on parts relatively to carry out setback with respect to the chair back, but under this situation, though since be non-shake state or the state that shakes all to be waist pass through the back plate by parts contact with people's waist, thereby with only with after plate situation about supporting compare, we can say that applicability and aeration or resiliency are all poor.Relative therewith, in the present embodiment, though since be non-shake state or the state that shakes all only with back plate 17 supporting healths, thereby given full play to the advantage of these netted back plates of applicability/resiliency/aeration.

Make under seat 4 and the situation of the chair back 6 interlocks, mostly be usually just that seat 4 retreats and hypsokinesis, but as present embodiment, when also making 4 to carry out down maneuver, we can say when having promoted to shake after the encirclement effect of 17 pairs of healths of plate.When being built in the 21a of the portion of holding up of master connecting-rod 21 and movable support body 22 in the curb girder 14, can make overall compactization, and aesthetic property is also good.This point also is one of present embodiment advantage.

(2)-1, the structure of the part centered by base and seat in second embodiment

Below, second embodiment of describing among Figure 15～Figure 23 is described.At first, with reference to Figure 15～head motion of Figure 18 explanation centered by base 3.In addition, for having the label identical with first embodiment with the parts mark of the first embodiment identical functions, the explanation of this situation is omitted in principle.

In the present embodiment, as having added the elastomeric element of elastic resistance to fascinating behind the chair back 6, used the torsion bar 62 as Figure 15 and left and right sides lengthwise shown in Figure 180.As shown in figure 15, the left and right sides pars intermedia of torsion bar 62 is fixed on the central bracket 63, at central bracket 63 left and right sides cylinder cover 64 is arranged fixedly.Left and right sides cylinder cover 64 remains on the base 3 rotationally by bearing 65 and push part 66 up and down.Therefore, be formed with the recess 67 of upward opening at base 3.Torsion bar 62 is made of a plurality of leaf springs.

On the both ends, the left and right sides of torsion bar 62 rotor 68 is arranged fixedly, be fixed on the rotor 68 by the leading section of bolted with rocking arm 11.Rotor 68 is by lid 69 coverings of separate type up and down.The left and right sides of torsion bar 62 pars intermedia can not relatively rotate ground is chimeric that the central rocking arm 70 that extends below tiltedly from this torsion bar 62 arranged.

In addition, the side nearby of the central rocking arm 70 of the inside of base 3 dispose carry out about the wedge parts 71 of action, screw at wedge parts 71 and to have 72 the bar 73 of handling knob.Wedge parts 71 be fixed in two holding members 74 up and down on the base 3 be held in only carry out about action, and the back side of wedge parts 71 from the plane read fortune for about the line of growing crosswise tilt.

On the other hand, bar 73 be retained can not about the action.Therefore, when bar 73 is rotated, action about wedge parts 71 carry out, so, can make central rocking arm 70 rotations and the initial torsion with respect to torsion bar 62 is changed.That is, by handle knob 72 operation of rotation, can regulate the elastic resistance (hardness) when shaking.Dispose auxiliary bearing 75 in the left and right sides of central rocking arm 70, auxiliary bearing 75 is fixed on the central bracket 63.

As shown in figure 16, in the present embodiment, seat 4 is for being arranged at cushion pad 38 structure on the inner casing 37, and this is identical with first embodiment.In addition, be with the first embodiment difference, dispose shells (bottom) 76 such as resin system between present supporting mass 36 and the inner casing 37.Inner casing 37 is fixed on the shell 76, and in addition, shell 76 can not be fixed on the supporting mass 36 on action ground, front and back.Chair possess for operation pin pillar 2 be the action bars of cylinder and be used for the locking chair back 6 after the action bars (all not shown) that fascinates, these action bars all are installed on the shell 76.

Base 3, seat supporting mass 36 and rocking arm 11 threes' relation is identical with first embodiment basically, but, be characterised in that as present embodiment the front rod 18 of Connection Block supporting mass 36 and base 3 constitutes by carrying out chimeric two parts 18a, 18b up and down slidably.Therefore, can make seat 4 the amounts of retreating when shaking bigger than first embodiment, consequently, can be suppressed at that health improves applicability with separating of the chair back 6 under the state of shaking.

In Figure 16, depicted and accompany seat 4 and the parts of seat on the supporting mass 36, but owing to be omitted with the little so explanation of relevance of the present invention.In addition, as shown in figure 17, leave for the cross-drilled hole 77 that armrest system 8 is installed at the lateral surface of rocking arm 11, under the situation that armrest system 8 is not installed, with covering 78 cross-drilled hole 77 clogged.

(2)-2, the structure centered by the chair back in second embodiment

Below, the structure of the chair back 6 and periphery thereof is described.In the first embodiment, the integral body of afterframe is structure as a whole, but in the present embodiment, for example as Figure 20 and shown in Figure 21, left and right sides curb girder 14 and the back timber 15 of afterframe 13 are structure as a whole, and bottom girder 16 arranges separately, and as shown in figure 21, bottom girder 16 is fixed in the lower end of curb girder 14 by bolt 80.Bolt 80 is threaded in the nut that is entrenched on the curb girder 14.In addition, be formed with the just in time location recess 81 of the left and right end portions of chimeric bottom girder 16 in the lower end of curb girder 14.In addition, as shown in figure 20, bottom 82 is installed from behind on bottom girder 16.

But, although will be installed in for example Figure 12 of the edge parts 45(of back on the plate 17) embed four members of afterframe 13 successively, but when the integral body of afterframe 13 is structure as a whole, even owing to be easy to carry out edge parts 45 are embedded three members of afterframe 13, the back plate 17 of also must exerting oneself to stretch carries out to the embedding of last member, therefore, make the installation exercise of the back plate 17 of afterframe 13 become difficult sometimes.Relative therewith, as described in present embodiment, can be easy to back plate 17 is installed on the curb girder 14 according to following order: if bottom girder 16 manufactured the member 14,15 that is independent of other, after being installed on back plate 17 on curb girder 14 and the back timber 15, at last back plate 17 is installed on the bottom girder 16 of stationary state not, then, bottom girder 16 is fixed on the curb girder 14.

Expression back plate 17 among most of figure of second embodiment, but back plate 17 is by being installed on the afterframe 13 with the same method of first embodiment.In addition, in the present embodiment, though not shown head rest device 7 can be installed head rest device 7 by the method identical with first embodiment.For example shown in Figure 20 and Figure 21 A, the B, the medial surface of the pars intermedia up and down of the curb girder 14 of afterframe 13 be formed with chimeric on the recess 82 of bottom of connecting rod 24, be formed with pin-and-hole 83 for connecting rod 24 on connecting at recess 82.

Shown in Figure 21 A, the curb girder 14 of afterframe 13 is the roughly trapezoidal cross-section shape along with the back thickness thickening that steps forward of outside-in.The front and back tilts in the mode of skew along with to the inside trend and rearwards, and the angle of inclination of back is bigger than the angle of inclination of front.

The back of the body pillar 11a of rocking arm 11 goes up fixedly afterframe 13, and this point is identical with first embodiment, but concrete structure difference.Below, this point is described.For example shown in Figure 23 B, the roughly L shaped flat cutting face shape of the back of the body pillar 11a of rocking arm 11 for being constituted by outer panel 11a ' and the backboard 11a 〞 that is connected with its rear end, outer panel 11a ' by about two screws 85 be fixed in the medial surface of curb girder 14.Screw 85 is threaded in the tabular nut 87 of the groove 86 that is embedded in curb girder 14.

Master connecting-rod 21 is the mode almost identical with first embodiment, and the rearward end of bottom 21a is rotated on the medial surface that is installed in rocking arm 11 freely.That is, Figure 17～shown in Figure 180 for example, the first peritreme portion 88 forms one with the medial surface at the position, close rear end of the front and back longitudinal part of rocking arm 11, shown in Figure 22 B, bottom 21a is embedded the first peritreme portion 88, the screw 89 screw-ins first peritreme portion 88 that anticreep is used.Therefore, in second embodiment, the first peritreme portion 88 has realized the 5th 51 function of first embodiment.

In addition, Figure 17～shown in Figure 180 for example, be formed with in the bottom of the outer panel 11a ' of rocking arm 11 by the secondary formula outstanding second peritreme portion 90 to the inside, shown in Figure 22 B, the 21b of the portion of holding up of master connecting-rod 21 is embedded the minor diameter part of the second peritreme portion 90, then, anticreep is screwed in the second peritreme portion 90 with screw 92.Under this situation, as Figure 17 and shown in Figure 180, the hole 92 of holding up the second peritreme portion 90 that embeds among the 21b of portion becomes slotted hole, therefore, allows master connecting-rod 21 front and back centered by the first peritreme portion 88 to rotate.

Being characterized as of present embodiment, the 21b of the portion of holding up of master connecting-rod 21 is positioned at the inboard of the outer panel 11a ' of rocking arm 11, therefore, as first embodiment, need not form for example Figure 12 B～D) of pod 53(at curb girder 14.In addition, in the first embodiment, movable support body 22 embeds the pod 53 of curb girder 14, but in the present embodiment, movable support body 22 just embeds the 21b of the portion of holding up of master connecting-rod 21.The 21b of the portion of holding up of master connecting-rod 21 is surrounded from the inboard by side cover 90.

For example shown in Figure 23 A, the B, in the present embodiment, between back plate 17 and movable support body 22, accompany the guard block 93 that is constituted by the such elastic plate of resin plate.Guard block 93 forms the band shape of the lengthwise up and down of the inboard that extends to movable support body 22, and it is screwed on curb girder 14 at both ends up and down.The moving range that guard block 93 surpasses movable support body 22 is extended up and down, so the supporting force of movable support body 22 extensively disperses to transmit on the plate 17 of back.Consequently, prevent that power from concentrating on the privileged site of back plate 17.

(2)-3, the advantage of second embodiment

The situation that second embodiment mentions, also has other advantage in top explanation.For example, in second embodiment, the back of the body pillar 11a of rocking arm 11 is fixed on the medial surface of curb girder 14 of afterframe 13, but utilizes this structure can carry out the assembling of chair simply.

That is, in second embodiment, master connecting-rod 21 is installed on the back of the body pillar 11a of rocking arm 11 in advance, afterframe 13 can be fixed in then on the back of the body pillar 11a.Therefore, by plate 17 after on afterframe 13, installing in advance, and finish as the chair back 6, then, the chair back 6 can be fixed on the back of the body pillar 11a.Therefore, can carry out the assembling of chair expeditiously.And, because the 21b of the portion of holding up of master connecting-rod 21 hidden by side cover 90, thereby can not produce the aesthetic property difference or the trouble of clamping people's hand.

In addition, if the 21b of the portion of holding up of master connecting-rod 21 is embedded the second peritreme portion 90, then have prevent master connecting-rod 21 with about the advantage that contacts.In addition, when constituting torsion bar 62 with a plurality of leaf springs, has the advantage that can increase the torsion of specific load than the integrative-structure product.

(3) the 3rd embodiments

Expression the 3rd embodiment among Figure 24 A～C.This embodiment utilizes the deflection deformation of curb girder 14 as the auxiliary drive unit that the tension force of back plate 17 is regulated.Though also be that the chair back 6 possesses the afterframe 13 that the back side is seen as rectangle in the present embodiment, but it is different with first embodiment; that the back of the body pillar 11a of rocking arm 11 sees from the back side and be the Y font that the position of intermediate altitude up and down of left and right sides curb girder 14 is fixed in two trouble shape leading section 11c of back of the body pillar 11a.

The leading section of rocking arm 11 enters the inside of base 3, and front end is connected with base 3 by first 12.In addition, present 4 front portion is provided with downward left and right sides front rack 4a, and front rack 4a is connected with base 3 by the sliding axle 96 of left and right sides lengthwise, and sliding axle 98 embeds slidably from the side in the slotted hole 97 of hypsokinesis posture.In addition, be arranged at seat on 4 about intermediate bracket 4b be connected rotatably by jackshaft 98 with rocking arm 11.Seat 4 is with the chair back 6 interlocks and hypsokinesis and retreat, but the degree of seat 4 hypsokinesis is littler than the degree of the chair back 6 hypsokinesis.

And in the present embodiment, the ring as tension adjustment unit disposes side connecting rod 99 in the left and right sides of base 3.The front end of side connecting rod 99 is connected the position at the rear of the center of rotation of rocking arm 11 in the base 3 by front axle 100, and the front and back pars intermedia of side connecting rod 99 by rear axle 101 rotationally with from seat 4 downwards the outstanding intermediate bracket 4c that arrange be connected.The dorsal part of the chair back 6 is expanded and be erected to side connecting rod 96 to the left and right, and the upper end of side connecting rod 99 becomes the circular-arc 99a of pushing portion that sees in the side to lordosis.And the 99a of this pushing portion contacts with the left and right sides both ends of plate 17 middle parts of the side, back by the 17a of portion from dorsal part under the state near the curb girder 14 of afterframe 13.

In this embodiment, be positioned at the rear and the rear of the connecting portion that makes curb girder 14 and seat 4 in the connecting portion of rocking arm 11 and seat 4 of the fulcrum that fascinates of rocking arm 11 by the fulcrum that fascinates that makes side connecting rod 99, thereby make the hypsokinesis degree of side connecting rod 99 bigger than the hypsokinesis degree of rocking arm 11, therefore same with first embodiment, when shaking, back plate 17 is lax by the position of the 17a of portion at waist.Bring into play the effect same with first embodiment thus.

(4) the 4th embodiments

Figure 25 represents the 4th embodiment.In this embodiment, also be that afterframe 13 has left and right sides curb girder 14 and form the front to see it is rectangle, the upper end of back of the body pillar 11a is fixed on the pars intermedia up and down of curb girder 14 (preferred waist is by near the 17a of portion or its).

And, in this embodiment, the curb girder 14 of afterframe 13 is regarded the distortion as direction bending to the left and right as from the front, in addition, be connected with base 3 by first 12 leading section with rocking arm 11, make first 12 axle center with respect to about the vertual (virtual) horizontal line 102 of growing crosswise some angle θ that only tilt, with from the plane more to the left and right the outside advance and more retreat.

Like this, by first 12 axle center is tilted, when rocking arm 11 hypsokinesis, about the upper end of back of the body pillar 11a between the interval narrow down, consequently, the flexible deformation takes place in left and right sides curb girder 14, so that narrower with respect to the interval of the fixed part of carrying on the back pillar 11a, thus, back plate 17 is centered by the position of the front end of back of the body pillar 11a and relax.Therefore, the performance effect same with first embodiment.

In addition, the flexible deformation takes place in curb girder 14 by shaking, but owing to the two ends up and down of curb girder 14 are supported by back timber 15 and bottom girder 16, so the interval of the interval of the upper end of left and right sides curb girder 14 and lower end does not change.

In the present embodiment, make first 12 axle center see run-off the straight from the plane, but, see (perhaps the plane is seen with the front and seen both sides) in the front even run-off the straight is also brought into play identical effect (under the situation of seeing the axle center run-off the straight that makes first 12 from the front, as long as the mode run-off the straight to advance more high more laterally.）

(5), the 5th embodiment

Figure 26 represents the 5th embodiment.This embodiment also is by shaking the interval of back of the body pillar 11a to be narrowed down, and therefore, the relation between back of the body pillar 11a and the afterframe 13 is identical with the 4th embodiment.

And, in this embodiment, about first 12 be separated from each other, they can be laterally inserted the logical cylindrical shell 103 that is fixed in base 3 slidably, and left and right sides rocking arm 11 is connected with the rear portion of base 3 by overlapping flexible wire rod 104.Therefore, when 11 hypsokinesis of left and right sides rocking arm, this left and right sides rocking arm 11 is moved by the stretching action of wire rod 104, so that interval each other narrows down.That is, in this embodiment, the parallel as a whole movement of left and right sides rocking arm 11.Rocking arm 11 pushes laterally by the helical spring 105 that is embedded on first 12.

In order to ensure the level and smooth slip of left and right sides rocking arm 11, as the slip auxiliary unit, fixedly have and the opposed axis of guide 106 of the rear side of wire rod 104 at rocking arm 11, two axis of guides 106 are embedded common guide cylinder 107 slidably.

(6), other

The present invention also can carry out various specializing except above-mentioned embodiment.For example, applicable object not necessarily is limited to swivel chair, for example also applicable to the fixed chair of arenas with chair, bench and so on.As mentioned above, seat also can be made web frame.

In addition, the mode of each inscape and structure can be carried out various selections as required.For example, as the structure of afterframe, can be to make each beam respectively to assemble, perhaps with curb girder with bottom girder is made of one and back timber is made independent parts.In addition, also can be the structure that left and right sides rocking arm is linked into an integrated entity, perhaps can the integral body of the frame mounting that is made of afterframe and rocking arm be formed as one by resin and light metal.In addition, afterframe also can have the mode that does not have bottom girder.

Certainly, make the mechanism of chair back hypsokinesis be not limited to embodiment, in addition, the present invention is also applicable to the chair that is chair back hypsokinesis.As the back plate is fixed in method on the afterframe, can adopt the method for utilizing welding or bonding method of fixing, using secure component, perhaps will the back plate form bag shape and make it cover method on the afterframe.Under the situation of using the movable support body as first embodiment, by connecting left and right sides movable support body with cross bar, also can make the lifting simultaneously of left and right sides movable support body.

(7), be contained in invention in the present embodiment

In addition, present inventors in No. the 6896369th, No. the 6709057th, United States Patent (USP), United States Patent (USP) publicity the simple structure of head motion (making the lazy-tongs of the chair back and the action of seat interlock).Similar with this United States Patent (USP) shown in Figure 27 A.Namely, the head motion of Figure 27 A possess the base 111 that is fixed on the pin pillar 110, after the rocking arm 112 that fascinates and be connected with base 111 freely, the front portion of seat portion 113 is connected via front rod 114 rotatably with base 111, in addition, base 111 is connected by the back link 115 of hypsokinesis posture from the side rotatably with rocking arm 112.

Connect rotationally with respect to base 111 by the lower end of pin 116 with back link 115, on the other hand, the upper end of back link 115 connects under the state that allows with respect to the slip of rocking arm 112 front and back.For example, the pin 117 of the upper end by will being arranged at back link 115 embeds the slotted hole (perhaps elongated slot) 118 that is formed at the front and back lengthwise on the rocking arm 112, thereby allows back link 115 and rocking arm 112 relatively to slide.

And, being formed with the downward protuberance 119 that extends to slotted hole 118 in the present portion 113, protuberance 119 is connected by pin 117 with back link 115 that (in addition, the seat portion 113 under this situation is also to contain the generalized concept use of a supporting mass downwards.）。Therefore, when the people leans against on the chair back, the rocking arm 11(chair back) the opposing spring members that is built in base 111 then fascinates, and seat portion 113 hypsokinesis and retreating.

The chair of this Figure 27 A is the same with above-mentioned United States Patent (USP), has the advantage that can utilize simple linkage to make a portion 113 and chair back interlock.Yet the present inventor studies the back and finds, also has the leeway of improvement.For example, seat portion 113 is subjected to front rod 114 and the supporting at 119 two positions of protuberance downwards, but front rod 114 is owing to can relatively rotate with respect to seat portion 113 and base 111 both sides, when therefore worry applies downward load in the front portion to seat portion 113, front rod 114 hypsokinesis, seat portion 113 rocks as a result.That is, the postural stability of worry seat portion 113 is poor.

Figure 27 B is the figure that schematically shows first embodiment and second embodiment, as understandable from the contrast of Figure 27 A and Figure 27 B, the head motion of first embodiment and second embodiment has followed the improving technology of Figure 27 A, but it is characterized in that having added master connecting-rod 21.

That is, in first embodiment and second embodiment, the invention publicity " a kind of chair has: base 3; Be disposed at the seat portion 4 of the top of above-mentioned base 3 '; And can after the rocking arm 11 that is connected with base 3 with fascinating, wherein, seat portion 4 ' forward position be connected rotatably (in other words by front rod 18 with base 3, be exactly that front rod 18 is connected with the 4 ' both sides of seat portion rotatably with respect to base 3), seat portion 4 ' can be connected with rocking arm 11 slidingly back and forth at the position of the rear side of front rod 18, and seat portion 4 ' by auxiliary connecting rod 21 ' with rocking arm 11 in slidably Connection Block portion 4 ' the position of back of part (for example slotted hole 20) be connected.”。

In this invention, seat portion 4 ' be to have enlisted the services of the concept of having removed the parts of rocking arm 11 in the parts of the top that is disposed at base 3 is with chair back interlock and comprise the generalized concept of a supporting mass and shell.In addition, publicity has been carried out in concrete being formed in first embodiment and second embodiment of this invention.

In the head motion of this first embodiment and second embodiment, owing to keep connecting rod 21 to be connected with rocking arm 11 at the position of the back of tail-bracket (protuberance downwards) 42, thereby seat portion 4 ' posture be subjected to auxiliary connecting rod 21 ' restriction (from behind stretch), even therefore seat portion 4 ' the front portion apply big downward load and also can not become forward lean, make a portion 4 ' always be held in stable posture, this point is the advantage of described invention.

As intelligible from the comparative illustration of above Figure 27 A and Figure 27 B, auxiliary connecting rod 21 ' as himself possessing skills property meaning.That is, the function that auxiliary connecting rod 21 ' with making back plate 17 is lax and the function that headrest is advanced are irrelevant, have the meaning of the value that improves head motion.Therefore, have auxiliary connecting rod 21 ' head motion can be used as the invention that is independent of claim scope of the present invention.In addition, though may not be as described,, as present embodiment utilization have concurrently auxiliary connecting rod 21 ' function master connecting-rod 21 and make back plate 17 lax or when headrest is advanced, will be more useful.

Claims (12)

1. chair possesses:

Seat;

The chair back possesses the waist of the waist that supports the people who takes one's seat by portion; And

Two movable support bodies support the described waist of the described chair back by the left and right sides sidepiece of portion from dorsal part,

Described movable support body is constituted as and can moves up and down to regulate the described waist of the described chair back by the height and position on the summit of portion.

2. chair as claimed in claim 1, wherein,

Described movable support body is provided with the handling knob by the described height and position on the described summit of portion of the described waist of regulating the described chair back.

3. chair as claimed in claim 1 or 2, wherein,

The described chair back is for opening the structure of being located at afterframe with flexible back backrest.

4. chair as claimed in claim 3, wherein,

Described back backrest is netted.

5. chair as claimed in claim 1 or 2, wherein,

Described waist bends to preceding convex by the shape of portion on the vertical profile side view.

6. chair as claimed in claim 1 or 2, wherein,

Described movable support body is the shape of the approximate ellipsoidal of growing up and down from the side, sees the rectangle that is lengthwise from the front.

7. chair as claimed in claim 1 or 2, wherein,

Described movable support body is resin system.

8. chair as claimed in claim 3, wherein,

The curb girder of described afterframe about by the left and right sides sidepiece that constitutes the described chair back constitutes, and is provided with in the bottom of described movable support body to the interior side-prominent described of described curb girder to handle knob.

9. chair as claimed in claim 1 or 2, wherein,

Possessing the action of behind the described chair back, fascinating and power being delivered to the chair back or near the auxiliary drive unit of portion it.

10. chair as claimed in claim 3, wherein,

On the afterframe that constitutes the described chair back, headrest can be installed with seesawing.

11. chair as claimed in claim 9 wherein, possesses:

Kiss the earth and have the leg of pin pillar;

Be fixed in the base of described pin pillar; And

But the rocking arm that is connected with described base hypsokinesis,

Described seat is connected with base and rocking arm, retreating also hypsokinesis when the afterframe hypsokinesis together,

Described auxiliary drive unit has the master connecting-rod that described movable support body is installed on the upper end,

Described master connecting-rod is connected with described rocking arm with described seat and is set to according to the ratio hypsokinesis bigger than the described chair back.

12. chair as claimed in claim 9, wherein,

The curb girder of described afterframe about by the left and right sides sidepiece that constitutes the described chair back constitutes,

Described auxiliary drive unit has the master connecting-rod that described movable support body is installed on the upper end,

Be formed with the pod that described master connecting-rod enters at described curb girder,

The described pod of described curb girder spreads all over its whole and opening in the wings, and also opening forwardly of the position that described movable support body is installed.

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