CN101505634A - Chair - Google Patents

Abstract

A backrest (4) has a flexible back shell (4a). The upper end of the back shell (4a) is fitted to the upper end of a back support (19). A seat (3) is secured to a horizontal portion (20a) of the back support (19). The back support (19) is connected to a base (2) so as to be movable and tiltable backward. An auxiliary frame (40) is connected to the rear of the base (2) so as to be tiltable backward and is relatively movably connected to the back support (19). The lower portion of the back shell (4a) is held on the auxiliary frame (40) so that they can be relatively moved in the vertical direction and that they cannot be separated from each other in the backward and forward directions, and the lower portion of the back shell (4a) is pressed forward by a support body (54). When the backrest (4) and the seat (3) are tilted backward, the back shell (4a) is extended and deformed to a flat shape. Among portions of the seat (3), a seat front portion (3a) on which the thighs of the seated person is placed can be tilted forward about a connection pin (12). Consequently, swelling of a lower leg of the seated person can be suppressed by eliminating the compression on the thigh.

Description

Chair

Technical field

The present invention relates to backrest and seat interlock and the chair (chair synchronously) of hypsokinesis.Particularly, the present invention relates to chair that the women is fit to.

Background technology

That fascinates behind the backrest waves chair, for example many as the office rotating chairs.Waving chair has and has only that fascinating behind the type of fascinating behind the backrest and seat and the backrest links and then fascinate and (/ or) retreats mobile synchronized model.Also have, about making a lot of motions that are configured with of fascinating behind the backrest.

Also have, as back configuration, have plenty of and set up net on framework, but, be to use mostly on the front of plastic thin back shell and set up pad, the back shell usually is installed on the back of the body support member (back of the body pillar) of its rear configuration.

For example use the occasion of office chair the people, have and make straight the rising in backrest hypsokinesis ground carry out the working method (the non-mode of waving) of personal computer operation's work of etc.ing above the waist and make the backrest hypsokinesis and the mode (waving mode) loosened is (certain, this is to classify easily, also can lean against sometimes to carry out certain work on the backrest).

People at seat directly plays duty above the waist, and it is important that straight and upright back is taked correct posture, and but, the people who seat as if the unstable rule of pelvis is bow-backed easily.Therefore, make backrest have the concentrated area and support people's pelvis, the Health-care waist-protection unit function of lumbar vertebrae., if strong Health-care waist-protection unit function is brought into play too much under swinging condition, then people's waist can be oppressed very doughtily, and usability instead might variation.

The improvement scheme of relevant this point is disclosed in the patent documentation 1 of the previous application of the applicant.That is, be that backrest is formed the side crooked structure of looking in the patent documentation 1, backrest is looked from the side under non-swinging condition, and forwards convex ground is crooked, and backrest integral body is looked from the side when waving becomes the mode of flat condition.Particularly, in the invention of above-mentioned previous application, the folder in the backrest is fixed in separately connecting rod every the upper and lower of bending point, by changing the hypsokinesis degree of connecting rod, makes that the shape that backrest is looked from the side under non-swinging condition and swinging condition is different.

Patent documentation 1: No. 3553301 communique of patent

Summary of the invention

The problem that solution is planned in invention

Yet present inventors find that for masculinity and femininity, the occupation mode of chair is different after having observed the user mode of chair.

Promptly, the male sex uses the occasion of chair, carry out work (for example operation of the operation of keyboard, mouse) for taking whole the leaning against on the backrest of back with the posture of what is called layback, perhaps the bad posture of this bearing of for example armrest being carried out work on desk does not have psychology to conflict, and is delithted with the state that waves and makes backrest hypsokinesis greatly.

On the other hand, in women's occasion, nearly all be continue to adopt to stretch above the waist and the posture of drawing two knees at work, can not take to lean against on the backrest layback or the posture of armrest on desk.Also have, the hypsokinesis angle that can find to be delithted with backrest is a low-angle.A little less than the women likes the little reason of hypsokinesis angle of backrest we can say mainly being the women and the male sex compares abdominal muscle.

On the other hand, as for being sitting in the obstacle that carries out the women of work on the chair, the edema problem of calf is arranged.The main cause of edema is that blood circulation worsens, and the reason that the calf edema takes place the women easily can be presumed as follows.Promptly, can infer, occasion the male sex, can open leg, stretch back ground and take the posture loosened at work at any time, so blood circulation disorder also less occurs, the women then on chair two knees draw in, shank is motionless, and it is very strong to carry out the tendency of work with same posture with forward lean slightly for a long time under the situation of seat surface compressing huckle.

The women's of office work in recent years is to handle the OA machine-man of keyboard, mouse as the center facing to display, and OA machine operation work is to keep same posture for a long time facing to display mostly, significantly occurs in office in recent years so we can say the edema problem of calf.

As mentioned above, observe the relation of women and chair, not talkative existing chair must be the mode/mechanism that is fit to the women., in the past from psychological aspects, action aspect, the such idea of chair that makes it to have the easy-to-use function of women we can say basically do not have.

The present invention proposes for improving such present situation, thereby its purpose is to provide a kind of idea that partly follows above-mentioned patent documentation 1, and suitable women's chair.

Solve the scheme of problem

Chair of the present invention as basic comprising, possesses: be installed in the matrix on the leg; Seat by above-mentioned matrix support; The seat after the people can by backrest; And the back of the body support member that above-mentioned backrest has been installed, above-mentioned seat and back of the body support member are supported by matrix, can revolt spring assembly and fascinate at least.

And, above-mentioned backrest possesses the back shell of softness of the body pressure that is supporting the people behind the seat, above-mentioned back shell is under the state of back of the body support member and not hypsokinesis of seat, bend to the convex forward of looking from vertical disconnected side greatly, the waist of the people behind the seat is being supported in the energy concentrated area, if back of the body support member and seat hypsokinesis, then by looking from vertical disconnected side and extensional deformation near flat state.This is the 1st feature.

Also have, above-mentioned back shell be top can not before and after be installed on back of the body support member with breaking away from, thereby can extensional deformation, be linked with on the above-mentioned back of the body support member with this back of the body support member after fascinate to link and then fascinate, thereby make the auxiliary frame of back shell extensional deformation.This is the 2nd feature.In addition, back of the body support member of the present invention is the meaning that the parts of backrest are installed on it, is not the meaning at rear portion that constitutes the chair of seat.

According to the present invention, people behind the seat with the protuberance forward of waist (lumbar vertebrae) contact backrest with the straight posture above the waist that rises, thereby can keep center of gravity above the waist directly over pelvis, continue to keep the correct body position that stretches back giocoso.Particularly, propping up the lumbar vertebrae of the people behind the seat, making the upper part of the body of the people behind the seat become the posture of some arch back by the protuberance forward of backrest, as a result, head is convenient to lift, therefore, can under the graceful posture of straight and upright back, continue for a long time to use, therefore, be particularly suitable for the women.

Also have, under swinging condition, backrest is looked extensional deformation near flat state (can be finally to become flat condition, also can be crooked lentamente) from vertical disconnected side, so can obtain waist is not resisted sense the comfortable swinging condition that the waist and the back of the body are supported equably.This respect also is fit to the women.

(1). variation 1 of the present invention

The present invention has various variation.In the 1st variation, above-mentioned auxiliary frame is set for than back of the body support member big degree hypsokinesis, the bottom of above-mentioned auxiliary frame and back shell (promptly, than the apex of the bend of convex forward part by the below) be coupled at above-below direction the state that can relatively move, can not break away from fore-and-aft direction, auxiliary frame is with than fascinating after the big degree of back of the body support member, thereby makes above-mentioned back shell extensional deformation.

(2). variation 2 of the present invention

In the 2nd variation, above-mentioned seat and back of the body support member are by fascinating after integratedly and to retreat mobile mode fastened to each other, the fulcrum that fascinates of seat and back of the body support member is positioned at the front portion of matrix, on the other hand, above-mentioned auxiliary frame is linked in the rear portion and the back of the body support member of matrix, make auxiliary frame be positioned at the fulcrum that fascinates than seat and back of the body support member by the rear, thereby make auxiliary frame with than the big degree hypsokinesis of back of the body support member the connection position of matrix.

(3). variation 3 of the present invention

In the 3rd variation, above-mentioned back of the body support member possesses near the anterior horizontal portion that present below extends to matrix, be arranged on above-mentioned horizontal portion the front portion fulcrum can after fascinate and retreat and be linked in the long horizontal bearing portion in the front and back that are arranged on the matrix movably, the horizontal portion that seat is fixed in above-mentioned back of the body support member, and, but above-mentioned auxiliary frame hypsokinesis be linked in the rear portion of matrix.

As chair of the present invention, back of the body support member and seat interlock and the chair of hypsokinesis must be if only seat, then seat and the not hypsokinesis of back of the body support member, the people leans against and then carries on the back on the backrest and fascinate after support member (or backrest) and seat begin (perhaps hypsokinesis and retreat).And, in the chair of synchronized model, but as seat hypsokinesis and retreat the device that is linked in matrix movably, be that present (the perhaps metalwork of holder) goes up the installation fulcrum mostly, this fulcrum is embedded in the slotted hole of offering on the matrix slidably, in general synchronized model chair, is to look from the side to form the slotted hole of matrix with the hypsokinesis posture, therefore, while seat fascinate after can descending as a whole and retreat mobile.

But, have now in the formation at this, seat axle is slided arbitrarily in the slotted hole of matrix, so the intensity of the spring of necessary increase back shaft.So, can become greatly the opposing of waving, this is the problem that exists.To this, the 3rd variation according to the application, the bearing portion that fulcrum embeds is horizontal, so a load that is caused can not work by the mode that fulcrum is slided, also have, auxiliary frame is linked in the rear portion of matrix, thus the load that caused of seat can not work by the mode that makes the auxiliary frame hypsokinesis, the two interosculates, even use weak spring also can prevent owing to seat makes seat and the hypsokinesis of back of the body support member.Therefore, can under the situation of the easiness of guaranteeing to wave, prevent hypsokinesis, the sinking of the seat that seat is caused.Generally speaking, it is light that women and the male sex compare body weight, so preferably compare weakly with the occasion that the male sex uses to waving the spring of being resisted, the application's the 3rd variation is considered with chair as the women.

(4). variation 4 of the present invention

In the 4th variation, the supporter that supports from dorsal part in the apex that is provided with on the above-mentioned auxiliary frame the bend of the convex forward on the shell of back.Because auxiliary frame is provided with supporter, even thereby the back shell be made of the raw material of softness can be because of body pressure be out of shape yet, people's waist can be supported well.Form supporter if press the roller shape, then relatively moving of auxiliary frame and back shell becomes smooth and easy, and the result follows fascinating of back of the body support member, and the back shell can positively be out of shape.Therefore, preferably press the roller shape and form supporter.

The present invention also has the variation relevant with seat.In the 5th variation, above-mentioned seat folder is divided into the anterior and seat rear portion of seat every the bend that extends at left and right directions, the seat front portion can be to lean forward in the center with above-mentioned bend, the anterior front and back width dimensions of above-mentioned seat be made as than the front and back width dimensions of seat integral body 1/4 big, than its 1/2 little size, and, the anterior parts by the present below of configuration of above-mentioned seat support, so as by the rotating operation of bar stage ground or have stage ground and change the posture of looking from the side.

(5). variation 5,6 of the present invention

As mentioned above, the women's of office calf edema problem is serious, but, if adopt the formation of the 5th variation, then can make anterior the leaning forward of seat and eliminates compressing to huckle, eliminates or suppress significantly the edema of calf.Particularly importantly 1/4 of the anterior front and back width dimensions of the seat front and back width dimensions more whole big here, 1/2 littler than it than seat.Under this size, pelvis suppresses the compressing of huckle effectively with regard under the situation of rear portion with the stable state maintenance of being present.

In the application's the 6th variation, the leading section of seat collapses to overlooks the concavity of looking forward.Like this, if the leading section of seat collapses to and overlooks the concavity of looking forward, then the people behind the seat will be subjected to making the guiding function of two knees near the center line of seat, the result just keeps drawing in the posture of two knees easily.This is to consider that the women likes drawing in the mode that two knees are sat down.

Also have, in order correctly to support people's waist by the protuberance forward of backrest, preferably sit down as far as possible, but, owing to sit down very darkly, the curved front end of running into seat of leg can be uncomfortable.The women usually takes leg is reached the posture of seat below, so the curved front end of running into seat especially easily of leg.But according to the application's the 6th variation, the leading section of seat subsides from overlooking to look, thereby can sit down under the situation that prevents the curved front end of running into seat of leg very darkly.The 6th expansion invention also is to consider as the chair that the women is fit to.

Description of drawings

[Fig. 1] Figure 1A is the front view of chair, and Figure 1B is the side view of chair.

[Fig. 2] Fig. 2 A is the vertical view of chair, Fig. 2 B be the IIA-IIA from Figure 1A look overlook sectional drawing, Fig. 2 C is the chair rearview.

[Fig. 3] Fig. 3 A is the vertical disconnected side view of chair, and Fig. 3 B is the vertical disconnected side view of seat and backrest.

[Fig. 4] is the vertical view that has omitted under the state of seat.

[Fig. 5] is the stereogram that constitutes the parts of wabbler mechanism.

[Fig. 6] is the stereogram that separates of matrix and undercarriage parts.

[Fig. 7] is the sectional drawing that the VII-VII from Fig. 4 looks.

[Fig. 8] is the sectional drawing that the VIII-VIII from Fig. 4 looks.

[Fig. 9] is the separation stereogram of shell in the seat.

[Figure 10] is the approximate three-dimensional map of outer shell.

[Figure 11] is the separation stereogram that constitutes the parts at back.

[Figure 12] Figure 12 A is the part of the backrest front view of deciding what is right and what is wrong, and Figure 12 B has omitted under the state of mat the separation sectional drawing of looking from B-B of Figure 12 A, and Figure 12 C has omitted under the state of mat the sectional drawing of looking from C-C of Figure 12 A.

[Figure 13] is the separation stereogram that constitutes the parts at back.

[Figure 14] Figure 14 A and Figure 14 B are the stereogram of parts under assembled state that constitutes wabbler mechanism, and Figure 14 A is the figure that takes off the state of front shroud, and Figure 14 B is the figure that takes off the state of front shroud.

[Figure 15] is the vertical disconnected side view in the part at back.

[Figure 16] Figure 16 A is the dynamic concept map that is used to illustrate backrest and seat, and Figure 16 B is the concept map of expression Health-care waist-protection unit function.

[Figure 17] is the separation stereogram of the anterior supporting mechanism portion of expression seat.

[Figure 18] is the vertical view of the anterior supporting mechanism portion of expression seat.

[Figure 19] is the sectional drawing of looking of the XIX-XIX from Figure 18.

[Figure 20] is the sectional drawing of looking of the XX-XX from Figure 18.

Symbol description

1 leg

2 matrixes

3

3a seat front portion

3b seat rear portion

4 back shells

4 backs

9 anterior interior shell

Shell in 10 the rear portion

12 connect pin

19 back of the body support members

20 constitute the pipe of back of the body support member

The horizontal portion of 20a

20b carries on the back pillar

22 the 1st fulcrums

26 lower bearing parts

27 upper bearing (metal) parts

31 wave the spring of usefulness

34 be used for to the seat front portion fascinate the operation preceding bar

35 be used for can fascinate the parts of bearings of supporting seat front portion, ground

36 cam parts

40 auxiliary frames

42 the 2nd fulcrums

49 the 3rd fulcrums

54 push the supporter of back shell from the rear

56 guide pin

The specific embodiment

Secondly, according to accompanying drawing embodiments of the present invention are described.

(1). the summary of chair

The summary of chair at first, is described according to Fig. 1～Fig. 3.Chair possesses: leg 1; Be installed on the matrix 2 of the upper end of leg 1; Be disposed at the seat 3 of its top; And the backrest 4 that is disposed at seat 3 rears.The branch foot 6 that leg 1 possesses the leg post 5 that is made of cylinder and extends from leg post 5 radially is provided with Caster 7 at the front end of each foot 6.The locking of leg post 5 is removed by the operation of the bar 8 (with reference to Figure 1A) of setting on the matrix 2.

Shown in Fig. 3 A, B, seat 3 possesses in the seat of resinous front and back shell (seat) 9,10 and extend the pad 11 that ground is laid continuously on them, thereby, seat 3 comprise do not wave with regard to motionless seat rear portion 3b and can before the anterior 3a of seat that fascinates.The details aftermentioned, anterior in shell 9 and the rear portion shell 10 by about the connection pin 12 of growing crosswise connect, the anterior 3a of seat can be to lean forward in the center with connection pin 12.

Backrest 4 is structures of laying mat 4b on the front of plastic back shell 4a, at the rear of back shell 4a, has disposed the roughly overall height that relates to back shell 4a and the back of the body cover 13 that extends (back of the body cover 13 is fixed in back of the body support member 19 described later).Backrest 4 possesses the side protection department 4 ' that stretches out by the mode of the waist that surrounds the people behind the seat from the left and right sides.The main cause that side protection 4 ' is set is to improve that the postural stability of the people behind the seat and the people behind seat wear low waist trousers and it is blocked when exposing psoas, makes and cannot see from the outside.

Space between back of the body cover 13 and the matrix 2 is blocked by hood 14, and in the place ahead of matrix 2 front shroud 15 has been installed, and in the left and right sides of front shroud 15, has exposed and has been used for the fascinate handle 16 (details aftermentioned) of preceding bar of operation to the anterior 3a of seat.In addition, front shroud 15 is installed on the anterior interior shell 9 of seat 3.The symbol 17 of Figure 1 and Figure 2 is but that backrest is switched to retroverted state and bar 4 that can not retroverted state.

(2). seat and supporting mechanism thereof

Secondly, with reference to Fig. 4～Figure 10 seat 3 and supporting mechanism thereof are described.Matrix 2 becomes the support shape of upward opening, and is for example shown in Figure 4 on matrix 2, connect the back of the body support member 19 that seat 3 and backrest 4 are housed.Back of the body support member 19 possesses as 2 pipes 20 about critical piece.Pipe 20 comprises horizontal 20a that is positioned at seat 3 belows and extends at fore-and-aft direction and the back of the body pillar 20b that upwards rises from the rear end of horizontal 20a.

The front rack 21 of upward opening grooved of looking from the front is bonded to the leading section of the left and right sides pipe 20 that constitutes back of the body support member 19 by welding.And, about the 1st fulcrum (also can be called sliding axle) of growing crosswise 22 front rack 21 about being bonded to by welding, also have, about horizontal 20a of pipe 20 be coupled to one by the 1st attachment body 23 and the 2nd union body 24.The 1st fulcrum 22 dispose than horizontal 20a of pipe 20 by the below.

As shown in Figure 3, resinous outer shell (mounting plate) 25 is disposed at the below of shell 10 in the rear portion, and shell 10 is fixed in outer shell 25 removably in the rear portion, and outer shell 25 is fixed in the 1st union body 23 of back of the body support member 19 by screw etc.

As shown in Figure 9, anterior interior shell 9 is roughly near dull and stereotyped form.On the other hand, shell 10 is looked from the front and is bent to concavity upwards lentamente in the rear portion, also has, and looking from vertical disconnected front bends to concavity upwards lentamente.And shell the 9, the 10th in the front and back, by about insert among each a pair of tubular bearing 9a of portion, 10a and the semicircle shape bearing 9b of portion, the 10b and connect pin 12 and connect flexiblely.Connect pin 12 to the 1 fulcrums 22 and be positioned at rear (in other words, the 1st fulcrum 22 is positioned at the front than the bending point of the anterior 3a of seat) slightly.

In addition, in the present embodiment, before and after connecting in after the shell 9,10, utilize to sandwich the forming process mat 11 that is shaped integratedly, but, also can make, install mat 11 in addition.Outer shell 25 be disposed at shell 10 in the rear portion under, the poroid holding section 10c's of shell 10 is chimeric in claw-like holding section 25a by outer shell 25 and the rear portion, and shell in the rear portion 10 is installed on outer shell 25.

Be appreciated that from Fig. 4,7,8, the 1st fulcrum 22 of back of the body support member 19 is clipped by the lower bearing parts 26 and the upper bearing (metal) parts 27 that overlap up and down, and pressing component 28 is overlapped in upper bearing (metal) parts 27, and this three is fastening jointly by screw (not shown) on matrix 2 with the state that overlaps each other.

Example as shown in Figure 5 and Figure 6, on lower bearing parts 26,4 connecting hole 29 up/down perforations all around, on the other hand, on matrix 2, above-mentioned connecting hole 29 lucky nested bossy body 2a have been formed, nested lower bearing parts 26 on bossy body 2a and keep lower bearing parts 26 can not move in the horizontal direction.Pressing component 28 is anchored on bossy body 2a by screw.

On matrix 2, formed with the umbo 2b of the back end in contact of lower bearing parts 26, hole 2c that leg post 5 embeds, be used to install the extension 2d of handrail (not shown) etc.In addition, matrix 2, metal (upper parts the 26, the 27th, the die cast product of aluminium etc., pressing component 28 are sheet metal goods, but, the raw material of these parts, processing method can be selected arbitrarily.

For example be appreciated that at metal ( upper parts 26,27 and formed the elongated slot 30 of allowing that the 1st fulcrum 22 front and back are sliding from Fig. 8.Elongated slot 30 up and down overlaps each other and becomes slotted hole.Between metal ( upper parts 26,27, disposed spring (coil compression springs) 31, formed rear wall 32 in the rear end of lower bearing parts 26 from rear support spring 31.On the other hand, overlapping from the front springs frame 33 of the place ahead support spring 31 with the 1st fulcrum 22 of back of the body support member 19.

Thereby back of the body support member 19 (and seat 3 and backrest 4) can be revolted spring 31 and rearward and can be center and hypsokinesis with the 1st fulcrum 22.The elongated slot (slotted hole) 30 of metal ( upper parts 26,27 extends in the horizontal direction.Therefore, even the spring force of spring 31 is not too big, just the words seat 3 that is seated on the seat 3 of people can hypsokinesis yet.

In addition, also can not use lower shaft bearing parts 26,27, the 1st fulcrum 22 directly is installed on matrix 2, also have, also can come in 19 minutes and make the 1st fulcrum 22, the 1st fulcrum 22 is embedded in the slotted hole that forms on the matrix 2 with back of the body support member.

As shown in Figure 4, at the leading section of left and right sides front rack 21, the parts of bearings 35 of bar before being used for keeping freely to rotate has been installed, by parts of bearings 35 supporting cam wheel parts 36.Details aftermentioned about this point.

(3). backrest and wave structure

Secondly, backrest 4 is described and waves structure with reference to Fig. 3 and Figure 11～Figure 15.As mentioned above, backrest 4 possesses resinous back shell 4a and the mat 4b that is layed in its front (also laying the cloth of bag shape).Shown in Figure 12 A, on the shell 4a of back, formed many slits of growing crosswise 38, because the group's of this slit 38 existence, the shape of looking from vertical disconnected side on the shell 4a of back can keep the easy flexibility that changes.

Shown in Figure 11, Figure 14 A, B, about back of the body pillar 20b the upper end by section backward the last union body 39 of opening grooved connect, the upper end of back shell 4a can not before and after disengaging be installed on union body 39 on this.Particularly, shown in Figure 12 B, form card-tight part 4c, nested this card-tight part 4c on last union body 39 on the top of back shell 4a.

As Fig. 3 A, shown in Figure 13, as the part of wabbler mechanism, disposed with about 2 roughly scriptus auxiliary frames 40 of L (auxiliary frame also can be called afterframe or connecting rod) of looking from the side that tubing is critical piece.About the 2nd fulcrum 42 of growing crosswise be bonded to integratedly by carrier frame plate 41 constitute auxiliary frame 40 about the leading section of pipe.

As shown in Figure 3A, above-mentioned the 2nd fulcrum 42 is sandwiched in the rear portion of matrix 2 by the bearing 43,44 that is divided into up and down two with rotating state, and bearing 43,44 is fixed in matrix 2 by pressing component 45 by means of screw.Therefore, auxiliary frame 40 can be to fascinate in the center with the 3rd fulcrum 42.In addition, auxiliary frame 40 also can be linked in matrix 2 by pin.Fig. 3 middle (center) bearing 43,44 should have section to show, because numerous and diverse and do not provide section and show (hatching).Also have, only shown the parts of bearings 43 of top among Figure 13.

For example shown in Figure 13, the 3rd union body 46 of metallic plate system is bonded to the bottom of the left and right sides pipe that constitutes auxiliary frame 40 integratedly, also has, and the 4th union body 47 of metallic plate system is bonded to the upper end of left and right sides pipe integratedly.The 3rd union body 46 possesses groove 46a and impeller 46b forward up and down, and on the other hand, the 3rd fulcrum 49 is carried on the back the bottom of pillar 20b about being fixed in integratedly by carriage material 48.

And as shown in figure 15, two bearing body 50,51 clips the 3rd fulcrum 49 rotationally by being divided into up and down, and front and back bearings 50,51 is fixed in the 3rd union body 46 by the pressing component overlapping from the place ahead 52.Therefore, back of the body support member 19 (back of the body pillar 20b) and auxiliary frame 40 rotate in linkage.The bearing 50 of rear side is embedded in the 46a of groove forward of the 3rd union body 46, and pressing component 52 is fixed in the impeller 46b of the 3rd union body 46 by screw.

For example shown in Figure 13, upwardly extending pair of right and left bearing plate 47a is integrally formed in the 4th union body 47 on the auxiliary frame 40, this left and right sides of pin 52 break-through bearing plate 47a, the supporter 54 of roller shape (or roller shape) rotatably is placed in pin 52, and supporter 54 contacts with the back side of back shell 4a.Supporter 54 separates about being, also have, about supporter 54 are the forms (being that central portion attenuates as a whole) that become the conoid type of minor diameter area circle with the approaching part in the lengthwise center of backrest 4.

The part that contact with people's the back of the body behind the seat among the shell 4a of back is positioned at the mode of front by the part of supporter 54 contacts and looks from the side and bend to convex forward.Also have, shown in Figure 16 B, the 4a ' of apex portion forward of back shell 4a become with seat after people's the roughly the same height of the 3rd lumbar vertebrae Y3.

As shown in Figure 3A, in the back side of back shell 4a in the 3rd union body 46 of auxiliary frame 40 and the part between the 4th union body 47, the guide pin 56 (guide pin 56 also can be the parts that separate with back shell 4a) of having grown crosswise about the bracket part 54 by rearwardly projecting case shape has formed.

On the other hand, as shown in figure 15, the guide pin 56 of backrest 4 is embedded in wherein guide body 57 is fixed in auxiliary frame 40 by screw the 3rd union body 46 and the 4th union body 47.Guide body 57 has up and down the long and bottom guiding groove 57a to open front, and guide pin 56 is embedded in guiding groove 57a, thereby makes back shell 4a not break away from forward and can be kept (chucking) with moving relatively up and down with respect to auxiliary frame 40.In addition, the bottom of guiding groove 57a is in order to allow that guide pin 56 is chimeric from the front side, to break away to open front.

Be appreciated that from Figure 13 and Figure 14 A auxiliary frame 40 is hidden from the place ahead by assist shroud 58, and as shown in Figure 14B, the part in the portion of mechanism of support backrest 4 except that the periphery of supporter 54 is hidden by front shroud 59.Offered the fenestra 59a that is used to allow roughly the first half of assist shroud 59 expose on the front shroud 58.Back of the body cover 13 is provided with the pawl that is used to install it, but, has omitted demonstration among Fig. 9.Shown in Figure 14 A, on the last union body 39 of back of the body support member 19 suspension bracket 60 can be installed.

Be appreciated that from Fig. 3 auxiliary frame 40 is installed on matrix 2 with the position near seat 3 rear ends, therefore, the central point (position of the black arrow points of Fig. 3 A) that load worked when the rotating fulcrum of auxiliary frame 40 seat with the people is compared rearward and is departed from.Therefore, seat and not under the state by backrest 4 the people, back of the body support member 19 become by auxiliary frame 40 from the rear state to upper support, also can stop thus the people be seat will make the 1st fulcrum 22 retreat mobile situation.

(4). the action of Health-care waist-protection unit function/seat and backrest

Secondly, the action of backrest 4 and the action of seat 3 and backrest 4 are described.Under non-swinging condition, shown in Figure 16 B, backrest 4 is looked from vertical disconnected side and is bent to convex forward greatly, therefore, people's the lumbar vertebrae Y (particularly the 3rd lumbar vertebrae Y3) that behind the seat is positively supported from behind, therefore the stability of the pelvis of the people behind the seat and vertebra high.As a result, the people can not continue with the posture of straight and upright back to be seated not tiredly for a long time.

Also have, the 4a ' of apex forward in the backrest 4 is supported from behind by supporter 54, so the 4a ' of apex forward of backrest 4 can not subside owing to people's body pressure or crooked degree diminishes.Therefore, can keep the Health-care waist-protection unit function well.

Secondly, the action of seat 3 and backrest 4 is described.Seat 3 and backrest 4 are installed on back of the body support member 19 in the present embodiment, and the hypsokinesis and retreat mobilely so seat 3 and backrest 4 become one also has, and the degree of the degree of the hypsokinesis of back of the body support member 19 and 3 hypsokinesis is consistent.

And, auxiliary frame 40 and back of the body pillar 20b (back of the body support member 19) are connecting, so auxiliary frame 40 also with back of the body pillar 20b after fascinate interlock and hypsokinesis, but, auxiliary frame 40 is because rotating fulcrum is positioned at the rear than the rotating fulcrum of back of the body pillar 20b, so auxiliary frame 40 is with than the big angle hypsokinesis of back of the body pillar 20b.Also have, back of the body support member 19 is also retired moving after the meeting, so while auxiliary frame 40 is pushed to the rear hypsokinesis, according to this point, auxiliary frame 40 is understood with than carrying on the back the big degree hypsokinesis of pillar 20b.

Therefore, supporter 54 and the common hypsokinesis of back of the body pillar 20b, supporter 54 is at back of the body pillar 20b hypsokinesis relatively thereupon.And, the bottom of back shell 4a can not be kept front and back with respect to auxiliary frame 40 because guide pin 52 is embedded in guide member 57 with breaking away from, so if supporter 54 relatively retreats at back of the body pillar 20b, then shell 4a in back is subjected to the effect of traction downwards, looks from vertical disconnected side to become forward by warpage greatly that the shape extensional deformation of convex becomes near flat shape.Therefore do not have the back of the body to the people, the resistance sense of waist under swinging condition, the people is very comfortable.

Also have, backrest 4 hypsokinesis on one side are extensional deformations on one side, and therefore backrest 4 will be installed on seat 3 and backrest 4 under the situation of the back of the body support member 19 that hangs down with the angle hypsokinesis bigger than seat 3 as a result, and backrest 4 can obtain enough hypsokinesis angles for guaranteeing comfortable swinging condition.

In the present embodiment, the size up and down of the bracket part 55 of back shell 4a is little, so therefore the bottom easy deformation of back shell 4a, can make back shell 4a warpage become to have the state of nature circle.Therefore, the adaptability to people's waist is good.

(5). the supporting mechanism that seat is anterior

Secondly, the supporting mechanism of the anterior 3a of seat mainly is described according to Figure 17～Figure 20.The front rack 21 of back of the body support member 19 constitutes the part of the bracing or strutting arrangement of the anterior 3a of seat, and front rack 21 has the outstanding forward tank shape extension 21a from horizontal 20a of pipe 20.

Parts of bearings 35 overlay configuration are in the extension 21a of left and right sides front rack 21.Parts of bearings 35 possess be positioned at about the outside side plate 35a, be positioned at side plate 35a inboard supporting surface 35b, downward protuberance 35c that the groove of tank shape extension 14a is embedded in, enter into the 35d of protuberance backward below the pipe 13, about the inboard inside sheet 35e that stretches out with the backplate 35f that contacts previously of front rack 14, protuberance 35d is linked in front rack 21 by pin 62 backward.

Thereby parts of bearings 35 keeps to such an extent that can not change posture with respect to front rack 21.The supporting surface 35b of parts of bearings 35 is that base end part is horizontal, is the inclined plane than it by the front side.

The anterior 3a of seat changes posture with the rotation of preceding bar 34.Before bar 34 comprise: go up the dead eye 63 that the forms left and right sides central shaft 34a of embedding mutually with the side plate 35a of parts of bearings 35; The centre-crank 34b that between the central shaft 34a of the left and right sides, is bent to form; The side crank 34c that is bent to form in the outside of left and right sides central shaft 34a; And angle the 34d of portion what the front end of side crank 34c was bent to form, fixing previously described handle 16 on the 34d of portion angling.

The direction of stretching out of stretching out direction and side crank 34c of centre-crank 34b is looked from the direction of principal axis of central shaft 35a and is departed from roughly 90 degree.Before the bight circle slightly of bar 34, and the side plate 35a of parts of bearings 35 approaches, before the institute bar 34 can dead eye 63 with its central shaft 34a embedding parts of bearings 35 in.

As shown in figure 19, the both ends, the left and right sides of the centre-crank 34b of bar 34 before cam part 36 is enclosed within from the outside.Cam part 36 possesses the centre-crank 34b of preceding bar 34 can be at the slotted hole 36a that slides with the direction of its axis quadrature, forms by the tubular of general flat, and an end mounting is on the supporting surface 35a of parts of bearings 35.Cam part 36 is that rotate at the center with its cardinal extremity, can change posture by the preceding posture (horizontal posture) of the orthostatism of the backplate 35f that is overlapped in parts of bearings 35 and the rake that is overlapped in supporting surface 35b.Present 3 anterior in formed on shell 9 following and be used to keep cam part 36 to stop projection 65 for orthostatism.

As shown in figure 20, forwardly in shell 9 anterior and be left and right sides pars intermedia, looking from the side that the left and right sides pars intermedia of the centre-crank 34b of bar 34 embeds before being provided with is circular-arc bullport 66.Bullport 66 is by the last guide surface 67 that forms downward concavity on the shell 9 in forwardly and installs upwards that the following guide body 68 of concavity forms that following guide body 68 is embedded in the connecting hole 69 that is installed on formation on the forwardly interior shell 9.

Rotate the preceding bar 34 of (rotation) operation by handle 16,, thereby make the anterior 3a of seat become common posture and the forward lean (with reference to the chain-dotted line of Figure 20) that does not lean forward by orthostatism and the preceding change of falling posture cam part 36.The forward leaning angle of this occasion is the degree of 10～15 degree preferably.For example can select to make can with the scales of 5 degree fixedly forward leaning angle etc. can keep the structure of a plurality of forward leans.

Cam part 36 is overlapped in the supporting surface 35b of the inclination of parts of bearings 35 under the forward lean of present anterior 3a, so can keep the forward lean of the anterior 3a of seat.In addition, cam part 36 when it fascinates, by push anterior in shell 9 stride across and stop projection 65.

The size relationship of the anterior 3a of seat of seat 3 and seat rear portion 3b is shown in Fig. 3 B.If the front and back width dimensions of seat 3 integral body is made as W0, the front and back width dimensions of the anterior 3a of seat is made as W1, then have (1/4W0＜W1＜(1/2W0), and W1 presses the preferably degree of 200mm of actual size.Also have, it is the front of 90～110mm that attachment (as the axle center of the connection pin 12 of flexural center) preferably is positioned at the part 3b ' that the rear portion 3b that disseats subsides most.Rear, the center, front and back 3 of recess 3b ' ratio 3 integral body of seat rear portion 3b ' be positioned at.

(6). other

Embodiments of the present invention are not limited to foregoing, also can be embodied as other variety of ways.For example the mode of each parts such as matrix, seat, back of the body support member, auxiliary frame, backrest needs only its function of maintenance, and any way can.Object lesson as, the back of the body support member and auxiliary frame all can be formed products such as sheet metal goods or die casting.

Can also be, the back of the body be positioned at horizontal of seat below in the support member and be die cast product or sheet metal goods, and back of the body pillar is a pipe system.Also has the chair that the present invention also links and then fascinates applicable to seat just and backrest.

Claims (7)

1. a chair possesses: be installed in the matrix on the leg; Seat by above-mentioned matrix support; The seat after the people can by backrest; And the back of the body support member that above-mentioned backrest has been installed, above-mentioned seat and back of the body support member are supported by matrix, and can revolt spring assembly and fascinate at least,

Above-mentioned backrest possesses the back shell of softness of the body pressure that is supporting the people behind the seat, above-mentioned back shell is under the state of back of the body support member and not hypsokinesis of seat, bend to the convex forward of looking from vertical disconnected side greatly, the waist of the people behind the seat is being supported in the energy concentrated area, if back of the body support member and seat hypsokinesis, then by looking from vertical disconnected side and extensional deformation near flat state

Wherein, above-mentioned back shell be top can not before and after be installed on back of the body support member with breaking away from, thereby extensible distortion, be linked with on the above-mentioned back of the body support member with this back of the body support member after fascinate to link and then fascinate, thereby make the auxiliary frame of back shell extensional deformation.

2. chair according to claim 1, wherein, above-mentioned auxiliary frame is set for than back of the body support member big degree hypsokinesis, the state that the bottom of above-mentioned auxiliary frame and back shell is coupled at above-below direction and can relatively moves, can not break away from fore-and-aft direction, auxiliary frame is with than fascinating after the big degree of back of the body support member, thereby makes above-mentioned back shell extensional deformation.

3. chair according to claim 2, wherein, above-mentioned seat and back of the body support member are by fascinating after integratedly and to retreat mobile mode fastened to each other, the fulcrum that fascinates of seat and back of the body support member is positioned at the front portion of matrix, on the other hand, above-mentioned auxiliary frame is linked in the rear portion and the back of the body support member of matrix, makes auxiliary frame be positioned at the fulcrum that fascinates than seat and back of the body support member by the rear to the connection position of matrix, thereby makes auxiliary frame with than the big degree hypsokinesis of back of the body support member.

4. chair according to claim 3, wherein, above-mentioned back of the body support member possesses near the anterior horizontal portion that present below extends to matrix, be arranged on above-mentioned horizontal portion the front portion fulcrum can after fascinate and retreat and be linked in the long horizontal bearing portion in the front and back that are arranged on the matrix movably, the horizontal portion that seat is fixed in above-mentioned back of the body support member, and, but above-mentioned auxiliary frame hypsokinesis be linked in the rear portion of matrix.

5. chair according to claim 1, wherein, the supporter that supports from dorsal part in the apex that is provided with on the above-mentioned auxiliary frame the bend of the convex forward on the shell of back.

6. chair according to claim 1, wherein, above-mentioned seat folder is divided into the anterior and seat rear portion of seat every the bend that extends at left and right directions, the seat front portion can be to lean forward in the center with above-mentioned bend, the anterior front and back width dimensions of above-mentioned seat be made as than the front and back width dimensions of seat integral body 1/4 big, than its 1/2 little size, and the anterior parts by the present below of configuration of above-mentioned seat support, so as by the rotating operation of bar stage ground or have stage ground and change the posture of looking from the side.

7. chair according to claim 6, wherein, the leading section of seat collapses to overlooks the concavity of looking forward.

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