CN209219612U - Long stroke leg rest telescoping mechanism and seat - Google Patents

Abstract

The utility model relates to a kind of long stroke leg rest telescoping mechanisms, including base frame unit, and including the seat frame with seat frame and the slide track component being mounted in seat frame, the slide track component is three section rails；Leg rest frame is connected to the slide track component and moves, operating unit with the movement of the slide track component, drive shaft including seat frame rear is arranged in, it is rotatably mounted in the seat frame, and: actuator, for driving drive shaft to rotate around center axis；First connecting rod and bar-link drive, the first connecting rod and drive bar-link drive in response to the rotation of the drive shaft to drive the slide track component to be moved to gathering to another position in expanded position from a position into expanded position is collapsed.The collapsible leg rest mechanism of the utility model folds, expansion is more laborsaving, and maximum angle folding can be carried out to leg rest frame, and after being unfolded leg rest can extend it is longer.

Description

Long stroke leg rest telescoping mechanism and seat

Technical field

The utility model belongs to technical field of furniture more particularly to long stroke leg rest telescoping mechanism and seat.

Background technique

Chair be for it is artificial make, study when the office furniture that is seated, office worker, which is seated for a long time after office, can feel tired Labor, in order to alleviate work fatigue, office worker be seated office duration it is longer after require relax.Traditional office chair All be to be made of backrest, seat cushion and sustainable chair leg, backrest, seat cushion position be all it is relatively-stationary, can not lie for people Lower rest.Office worker usually requires in addition to purchase the furniture for being suitble to lie down and is just able to achieve the office that is seated, recumbency rest, but this Sample needs to occupy office space space, and the office for being not suitable for narrow space uses.Based on the above issues, some band leg rest rests Chair gradually appear, leg rest portion rolls into one with chair by various modes, than if any one kind with leg support frame or putting The chair of leg frame, the leg support frame can be overturn between extended position and folding position；However, the leg branch at folding position Frame is basically perpendicular to seat frame, that is, inwardly collapse it is inadequate, so when leg support frame is in folding position, the leg of user Portion can touch leg support frame, this may cause discomfort；In addition, leg support frame hampers the downside of chair when at folding position Cleaning；It is more laborious when besides leg support frame is unfolded or folds.

In view of the above technical problems, applicant devises a kind of collapsible leg support mechanism and seat, and has applied practical new Type patent, Authorization Notice No. CN27477253U.This collapsible leg support mechanism and seat include seat frame；Leg rest frame Frame is pivotally connected to seat frame and can pivot between folding position and expanded position relative to seat frame；? Leg rest frame setting in folding position is below seat frame and at an acute angle with seat frame；In expanded position leg rest frame and seat Portion's frame is substantially coplanar.However in practical applications, it has been found that this collapsible leg support mechanism, the leg rest expansion of chair The length of elongation is inadequate, causes foot prop inadequate in comfort level above.

Summary of the invention

In order to solve the above technical problems, the purpose of the utility model is to provide leg rests after a kind of expansion can extend more Long collapsible leg rest mechanism, the purpose of this utility model, which also resides in, provides a kind of seat using the mechanism.

In order to achieve the above purpose, the utility model uses technical solution below:

Long stroke leg rest telescoping mechanism, comprising:

Base frame unit, including the seat frame with seat frame and the slide rail group being mounted in seat frame Part, the slide track component are three section rails；

Leg rest frame is connected to the slide track component and moves with the movement of the slide track component,

Operating unit, the drive shaft including seat frame rear is arranged in, is rotatably mounted to the seat frame On, and:

Actuator, for driving drive shaft to rotate around center axis；

First connecting rod and bar-link drive, the first connecting rod and drive connecting rod in response to the rotation of the drive shaft Driving mechanism is to drive the slide track component to be moved to gathering into expanded position from the position collapsed into expanded position Another position.

Preferably, the actuator is operating stick, the operating stick is connected to one end of the drive shaft.

Preferably, the first connecting rod is L-shaped, one end of first connecting rod is fixed on the driving shaft and with the rotation of drive shaft Then rotation.

Preferably, two slide track components are symmetricly set on the two sides of seat frame, sliding rail there are two the slide track components Component includes external slide rail, middle sliding rail and interior sliding rail, and the external slide rail is symmetrically mounted on the two sides of seat frame, middle sliding rail installation It can slide back and forth in external slide rail and along external slide rail, the interior sliding rail is mounted in middle sliding rail and can slide back and forth along middle sliding rail.

Preferably, it is fixed with first crossbar before the front end of described two symmetrically arranged middle sliding rails, it is described two right Claim to be fixed with second crossbar between the front end of the interior sliding rail of setting.

Preferably, the bar-link drive includes leg rest telescoping drive mechanism, the leg rest telescoping drive mechanism is used It collapses in driving the slide track component to be moved to from the position collapsed into expanded position to another in expanded position Position；The leg rest telescoping drive mechanism includes the first drive rod, the second drive rod, third drive rod and the 4th drive rod, One end of first drive rod is flexibly connected with the second drive rod, one end of second drive rod and the side of seat frame Rotation connection, one end of the other end and third drive rod of the second drive rod is hinged, the other end of third drive rod and the second cross Bar is hinged, and one end of the 4th drive rod and the second drive rod are hinged, and the other end and first crossbar of the 4th drive rod are hinged.

Preferably, being provided with limited post on second drive rod.

Preferably, the both ends of first drive rod are provided with universal joint, one end of the first drive rod and first connecting rod The other end be connected by universal joint, the other end of the first drive rod is connect by universal joint with the second drive rod.

Preferably, the tie point of first drive rod and the second drive rod is between the both ends of the second drive rod, Connection of the hinge joint of four drive rods and the second drive rod in the second drive rod other end and the first drive rod and the second drive rod Between point.

Preferably, the 4th drive rod includes the articulated section at both ends and the interconnecting piece of centre, the hinge at the both ends Socket part is not in the same plane.

Preferably, the two sides of the seat frame are also equipped with positive stop spring plate, the positive stop spring plate is located at external slide rail Rear end.

Preferably, the positive stop spring plate includes fixed part and sticking department, the positive stop spring plate by fixed part install to In seat frame, the sticking department is equipped with lead-in chamfered in face of the side of slide track component, and lock tab bubble is provided on sticking department, Limitation locking hole is offered on the interior sliding rail, when leg rest frame collapses, interior sliding rail is slided backward, the limiting lock on interior sliding rail Determine hole and is moved to completion locking on the lock tab bubble of positive stop spring plate.

Preferably, the other end of the drive shaft is hinged with spring guide holder, the seat frame is additionally provided with spring The guiding axis of fixing seat, the spring guide holder is inserted in spring fixed seat, between the spring fixed seat and spring guide holder It is also equipped with pressure spring.

A kind of seat, including back frame and collapsible leg rest mechanism as described above, the back frame connection Seat frame.

Compared with prior art, the utility model has the beneficial effects that

1. the utility model slide track component is more able to satisfy using three section rail mechanisms so that leg rest frame length of run is longer People's needs.

2. the first drive rod both ends of the utility model use universal joint, efficiently solve in drive rod loading process The uncertain problem in the direction of power, it is as a result simply, easy to operate.

3. in the foot telescoping drive mechanism of the utility model, there is angle, and between the first drive rod and the second drive rod The both ends of one drive rod and these three points of one end of the second drive rod constitute triangle, and due to the length of the first drive rod It is constant, and during leg rest overturning driving machine driving, one end of the second drive rod to the first drive rod and the second drive rod The distance between hinge joint does not change, and variation is only between one end of the second drive rod and one end of the first drive rod Distance, the variation of this two edge lengths of triangle is constant, and the variation of control third edge lengths is former to change triangular shaped transformation Reason, to drive the expansion and gathering of slide track component, on the other hand one side stable structure has raised the height of leg rest frame again Degree, so that leg rest is more attractive, hale and hearty.

4. passing through the structure setting of positive stop spring plate and interior sliding rail, structure is simple, and locking effect is good, can effectively avoid sliding rail Component faults occur.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the collapsible leg rest mechanism of the utility model in the deployed state.

Fig. 2 is the explosive view of the collapsible leg rest mechanism of the utility model.

Fig. 3 is the structural schematic diagram at collapsible leg rest mechanism another visual angle in the deployed state of the utility model.

Fig. 4 is structural schematic diagram of the collapsible leg rest mechanism of the utility model during expansion.

Fig. 5 is structural schematic diagram of the collapsible leg rest mechanism of the utility model under rounding state.

Fig. 6 is the structural schematic diagram of drive shaft Yu leg rest telescoping drive mechanism.

Fig. 7 is the partial enlarged view in Fig. 1 at A.

Fig. 8 is the partial enlarged view in Fig. 4 at B.

Fig. 9 is the cooperation schematic diagram of drive shaft, first connecting rod, the first drive rod and spring guide holder.

Figure 10 is the side view that leg rest frame cooperates between leg rest frame and slide track component in rounding state.

Figure 11 is cooperation schematic diagram of the leg rest frame in rounding state between leg rest frame and slide track component.

Figure 12 is the anti-excessively dead schematic diagram of leg rest frame first crossbar in rounding state.

It is identified in figure as follows:

Seat frame 1, slide track component 2, leg rest frame 3, the first pivot axis 4, drive shaft 5, actuator 6, first connecting rod 7, external slide rail 8, middle sliding rail 9, interior sliding rail 10, first crossbar 11, second crossbar 12, leg rest telescoping drive mechanism 13, leg rest overturning It is driving mechanism 14, the first drive rod 15, the second drive rod 16, third drive rod 17, the 4th drive rod 18, universal joint 19, hinged Portion 20, interconnecting piece 21, footrest rack 22, toe board 23, second connecting rod 24, the 5th drive rod 25, positive stop spring plate 26, spring guide holder 27, spring fixed seat 28, guide rail fixed metal plate 29, middle rail metal plate 30, internal rail metal plate 31, munnion 32, C-shaped axle bed 33, C-shaped baffle 34, reinforcing rod 35, fixed part 36, sticking department 37, lead-in chamfered 38, lock tab steep 39, limitation locking hole 40, limited post 41.

Specific embodiment

Specific embodiment of the present utility model is made a detailed explanation with reference to the accompanying drawing.

The reference azimuth of each component of the utility model is defined first, and the utility model makes on chassis and seat in normal mounting Used time, the front of seat are front end, and the rear of seat includes that the position where backrest is rear end, and the two sides of seat are side.

Embodiment:

Long stroke leg rest telescoping mechanism, including

Base frame unit, including the seat frame with seat frame 1 and the slide rail group being mounted in seat frame 1 Part 2, seat frame 1 has substantially quadrilateral structure, and slide track component 2 is three section rail assemblies；

Leg rest frame 3, is pivotally connected to the slide track component 2 and can be relative to the slide track component 2 around the One pivot axis 4 pivots between folding position and expanded position；As shown in figure 5, in the folding position, the leg rest frame 3 settings are below the seat frame 1 and at an acute angle with the seat frame 1；As shown in Figure 1, Figure 3, in the expansion position It sets, the leg rest frame 3 is substantially on the same face with the seat frame 1；

Operating unit, the drive shaft 5 including 4 rear of the first pivot axis is arranged in, is parallel to first pivot It shaft axis 4 and is rotatably mounted in the seat frame 1, and:

Actuator 6, for driving drive shaft 5 to rotate around center axis, specifically, actuator 6 is operating stick, behaviour One end of the drive shaft 5 is connected to as bar, and operating stick is approximately perpendicular to the setting of drive shaft 5；

First connecting rod 7 and bar-link drive, rotation of the first connecting rod 7 in response to the drive shaft 5, and the company of drive Bar driving mechanism is to drive the slide track component 2 to be moved to gathering to expanded position from the position collapsed into expanded position In another position, and drive leg rest frame 3 to be moved to from the position folded and unfolded in position and fold and unfold position Another position in setting.Specifically, first connecting rod 7 is L-shaped, and one end of first connecting rod 7 is fixed in drive shaft 5 and with drive The rotation of moving axis 5 and rotate, fixed point is substantially at the center of drive shaft 5.

It is fixed with the fixed metal plate 29 of guide rail in the two sides of seat frame 1, slide track component 2 there are two groups, and two groups of slide track components 2 are right Claim on the fixed metal plate 29 of the guide rail for being mounted on two sides.Specifically, slide track component 2 includes external slide rail 8, middle sliding rail 9 and interior cunning Rail 10, wherein external slide rail 8 is symmetrically mounted on the fixed metal plate 29 of guide rail of two sides, and middle sliding rail 9 is mounted in external slide rail 8 and can edge External slide rail 8 slides back and forth, and interior sliding rail 10 is mounted in middle sliding rail 9 and can slide back and forth along middle sliding rail 9.

As shown in Fig. 1, Fig. 3~Fig. 6, the rail metal plate 30 in being fixedly arranged at the front end with of middle sliding rail 9, between two middle rail metal plates 30 It is fixed with first crossbar 11；It is fixedly arranged at the front end with internal rail metal plate 31 in interior sliding rail 10, is fixed between two internal rail metal plates 31 Two cross bars 12.

As shown in Fig. 1~Fig. 6, bar-link drive includes leg rest telescoping drive mechanism 13 and leg rest turnover driving mechanism 14.Wherein the leg rest telescoping drive mechanism 13 is for driving the slide track component 2 one from gathering into expanded position Position is moved to gathering to another position in expanded position, and the leg rest turnover driving mechanism 14 is described for driving Leg rest frame 3 is moved to another position folded and unfolded in position from the position folded and unfolded in position.

Specifically, leg rest telescoping drive mechanism include the first drive rod 15, the second drive rod 16, third drive rod 17 with And the 4th drive rod 18.The both ends for stating the first drive rod 15 are provided with universal joint 19, and one end of the first drive rod 15 connects with first The other end of bar 7 is connected by universal joint 19, and the other end of the first drive rod 15 is connected by universal joint 19 and the second drive rod 16 It connects.One end of second drive rod 16 and the side of seat frame 1 are rotatablely connected, and the other end and third of the second drive rod 16 drive One end of bar 17 is hinged, and the other end of third drive rod 17 and second crossbar 12 are hinged, and hinge joint is close to second crossbar Middle part.One end of 4th drive rod 18 and the second drive rod 16 are hinged, the other end of the 4th drive rod 18 and the first cross Bar 11 is hinged, and hinge joint is close to the middle part of first crossbar 11.Further, the first drive rod 15 and the second drive rod 16 Tie point is between the both ends of the second drive rod 16, and the hinge joint of the 4th drive rod 18 and the second drive rod 16 is in the second drive rod Between 16 other ends and the first drive rod 15 and the tie point of the second drive rod 16.As optimization, the 4th drive rod 18 includes two The interconnecting piece 21 of the articulated section 20 at end and centre, the articulated section 20 at the both ends is not in the same plane.This design avoids It contacts between second drive rod 16 and first crossbar 11, has avoided between the two abrasion, while also reducing the 4th driving The contact area of bar 18 and the second drive rod 16 reduces abrasion, increases service life.It was collapsed in leg rest telescoping drive mechanism Cheng Zhong, if first crossbar 11 is moved rearwardly into after the second drive rod 16 and the hinge joint of seat frame 1, the second drive rod 16 The driving capability to leg rest telescoping drive mechanism will be lost, this position namely dead point.Occurs dead point situation in order to prevent, Limited post 41 is provided on two drive rods 16, when first crossbar 11 is moved rearwardly into certain position, first crossbar 11 will be in limit Column 41, thus avoid crossing dead point, as shown in Figure 10,

Leg rest frame 3 includes the footrest rack 22 being symmetrical arranged in interior 10 two sides of sliding rail, is set in the front end of two footrest racks 22 It is equipped with toe board 23.

Leg rest turnover driving mechanism 14 includes being symmetricly set on two second connecting rods 24 of middle 9 front end of sliding rail and being symmetrical arranged Two the 5th drive rods 25 in interior 10 front end of sliding rail.One end of second connecting rod 24 is fixed on middle rail metal plate 30, is particularly located at The lateral surface of middle 9 front end of sliding rail, the other end of second connecting rod 24 and the rear end of ipsilateral footrest rack 22 are hinged.5th drive rod 25 One end and internal rail metal plate 31 it is hinged, specific hinge joint is located at the front end of interior sliding rail 10, the other end of the 5th drive rod 25 with together The footrest rack 22 of side is hinged, and hinge joint is between the both ends of footrest rack 22.At this point, second connecting rod 24, the 5th drive rod 25, interior Four-bar mechanism is constituted between sliding rail 10 and footrest rack 22, as shown in Figure 10,11.

As shown in figure 8, prevent middle sliding rail 9 and interior sliding rail 10 from skidding off external slide rail to limit to slide track component 2, The two sides of seat frame 1 are also equipped with positive stop spring plate 26, and the positive stop spring plate 26 is located at the rear end of external slide rail 8.The limit Elastic slice 26 includes fixed part 36 and sticking department 37, and the positive stop spring plate 26 is installed by fixed part 36 to seat frame 1, described Sticking department 37 is equipped with lead-in chamfered 38 in face of the side of slide track component 2, and lock tab bubble 39 is provided on sticking department 37, described interior Limitation locking hole 40 is offered on sliding rail 10, leg rest frame 3 collapse when, interior sliding rail 10 slides backward, when interior sliding rail 10 after When end touches lead-in chamfered 38, interior sliding rail 10 inwardly squeezes lead-in chamfered 38, when interior sliding rail 10 slides backwards on limiting lock When determining hole 40 and being moved to the lock tab bubble 39 of positive stop spring plate 26, the homing under the effect of elasticity of sticking department 37, lock tab bubble 39 Into in limitation locking hole 40, to complete to lock.

As shown in fig. 1~fig. 5, be further fixed on munnion in the lower end of seat frame 1, the munnion 32 and seat frame 1 it Between be connected with reinforcing rod 35, for reinforcing the intensity of munnion 32.C-shaped axle bed is fixed with the two sides of the lower beam in munnion 32 33, drive shaft 5 is connected at the c-shaped opening of C-shaped axle bed 33, and C-shaped axle bed 33 is close in drive shaft 5 and is provided with C-shaped baffle 34, C The opening of shape baffle 34 and c-shaped opening it is contrary, C-shaped baffle 34, which is installed, simultaneously to be fixed afterwards and C-shaped axle bed 33 by screw Complete axis hole is formed, for fixing drive shaft 5.

As shown in Figure 1, the other end of drive shaft 5 is hinged with spring guide holder 27, it is solid to be additionally provided with spring in seat frame 1 Reservation 28, the guiding axis of spring guide holder 27 are inserted in spring fixed seat 28, between spring fixed seat 28 and spring guide holder 27 It is also equipped on pressure spring figure and does not identify.This design is in order to the power-assisted when folding and unfolding.

The present embodiment separately provides a kind of seat, including not identifying on back frame figure and collapsible leg rest described above Mechanism, the back frame connect seat frame 1.It is placed in seat frame 1 and leg rest frame 3 and fixes the Soft Rolls such as cushion Material forms seat, and people is sitting in seat frame, can hand operating stick, driving drive shaft rotation makes to drive first connecting rod movement, And then the movement of the first drive rod is driven, a drive rod drives the movement of the second drive rod, third drive rod and the 4th drive rod fortune again It is dynamic, and then stretch leg rest telescoping drive mechanism 13 forward, meanwhile, third drive rod 17 drives second crossbar movement, and then band Dynamic 5th drive rod 25 movement finally makes second connecting rod 24, the 5th drive rod 25, structure between interior sliding rail 10 and footrest rack 22 It is operated at four-bar mechanism, leg rest frame 3 is finally made to overturn opening forward.When needing to fold leg rest frame 3, opposite direction is only needed Rotate operating stick.

Above content is only illustrate to examples for clearly illustrating the present invention described in this specification.The utility model Person of ordinary skill in the field can make various modifications or additions to the described embodiments or using class As mode substitute, content without departing from the utility model specification or surmount model defined in the claims It encloses, all should belong to the protection range of the utility model.

Claims (14)

1. long stroke leg rest telescoping mechanism, characterized by comprising:

Base frame unit, including the seat frame with seat frame (1) and the slide rail group being mounted on seat frame (1) Part (2), the slide track component (2) are three section rails；

Leg rest frame (3) is connected to the slide track component (2) and moves with the movement of the slide track component (2),

Operating unit is rotatably mounted to the portions frame including the drive shaft (5) at seat frame (1) rear is arranged On frame (1), and:

Actuator (6), for driving drive shaft (5) to rotate around center axis；

First connecting rod (7) and bar-link drive, the first connecting rod (7) and drive in response to the rotation of the drive shaft (5) Bar-link drive is to drive the slide track component (2) to be moved to gathering to expansion from the position collapsed into expanded position Another position in position.

2. according to long stroke leg rest telescoping mechanism described in claim 1, it is characterised in that: the actuator (6) is operating stick, The operating stick is connected to one end of the drive shaft (5).

3. according to long stroke leg rest telescoping mechanism described in claim 1, it is characterised in that: the first connecting rod (7) is L-shaped, the One end of one connecting rod (7) is fixed on drive shaft (5) and rotates with the rotation of drive shaft (5).

4. according to long stroke leg rest telescoping mechanism as claimed in claim 3, it is characterised in that: there are two the slide track components (2), and two A slide track component (2) is symmetricly set on the two sides of seat frame (1), slide track component (2) include external slide rail (8), middle sliding rail (9) with And interior sliding rail (10), the external slide rail (8) are symmetrically mounted on the two sides of seat frame (1), middle sliding rail (9) is mounted on external slide rail (8) it can slide back and forth in and along external slide rail (8), the interior sliding rail (10) is mounted in middle sliding rail (9) and can be before middle sliding rail (9) After slide.

5. according to long stroke leg rest telescoping mechanism as claimed in claim 4, it is characterised in that: described two symmetrically arranged middle sliding rails (9) it is fixed with first crossbar (11) before front end, is fixed between the front end of described two symmetrically arranged interior sliding rails (10) Second crossbar (12).

6. according to the long stroke leg rest telescoping mechanism described in claim 5, it is characterised in that: the bar-link drive includes leg rest Telescoping drive mechanism (13), the leg rest telescoping drive mechanism (13) is for driving the slide track component (2) from collapsing expansion A position in position is moved to gathering to another position in expanded position；The leg rest telescoping drive mechanism includes the One drive rod (15), the second drive rod (16), third drive rod (17) and the 4th drive rod (18), first drive rod (15) one end is flexibly connected with the second drive rod (16), and the one of one end of second drive rod (16) and seat frame (1) Side rotation connection, one end of the other end and third drive rod (17) of the second drive rod (16) is hinged, third drive rod (17) The other end and second crossbar (12) hingedly, one end and the second drive rod (16) of the 4th drive rod (18) hingedly, 4 wheel driven The other end of lever (18) and first crossbar (11) are hinged.

7. according to long stroke leg rest telescoping mechanism as claimed in claim 6, it is characterised in that: be arranged on second drive rod (16) There are limited post (41).

8. according to long stroke leg rest telescoping mechanism as claimed in claim 6, it is characterised in that: the both ends of first drive rod (15) It being provided with universal joint (19), one end of the first drive rod (15) is connected with the other end of first connecting rod (7) by universal joint (19), The other end of first drive rod (15) is connect by universal joint (19) with the second drive rod (16).

9. according to long stroke leg rest telescoping mechanism as claimed in claim 7, it is characterised in that: first drive rod (15) and second The tie point of drive rod (16) is between the both ends of the second drive rod (16), the 4th drive rod (18) and the second drive rod (16) Hinge joint is between the second drive rod (16) other end and the first drive rod (15) and the tie point of the second drive rod (16).

10. according to long stroke leg rest telescoping mechanism as claimed in claim 9, it is characterised in that: the 4th drive rod (18) includes The interconnecting piece (21) of the articulated section (20) at both ends and centre, the articulated section (20) at the both ends is not in the same plane.

11. according to long stroke leg rest telescoping mechanism as claimed in claim 4, it is characterised in that: the two sides of the seat frame (1) are also It is equipped with positive stop spring plate (26), the positive stop spring plate (26) is located at the rear end of external slide rail (8).

12. according to the long stroke leg rest telescoping mechanism described in claim 11, it is characterised in that: the positive stop spring plate (26) includes solid Determine portion (36) and sticking department (37), the positive stop spring plate (26) is installed by fixed part (36) on seat frame (1), the lock Determine portion (37) and be equipped with lead-in chamfered (38) in face of the side of slide track component (2), lock tab bubble is provided on sticking department (37) (39), limitation locking hole (40) are offered on the interior sliding rail (10), when leg rest frame (3) are collapsed, interior sliding rail (10) is backward It slides, the limitation locking hole (40) on interior sliding rail (10), which is moved on the lock tab bubble (39) of positive stop spring plate (26), completes locking.

13. according to long stroke leg rest telescoping mechanism as claimed in claim 2, it is characterised in that: the other end of the drive shaft (5) is cut with scissors It is connected to spring guide holder (27), the seat frame (1) is additionally provided with spring fixed seat (28), the spring guide holder (27) Guiding axis is inserted in spring fixed seat (28), is also equipped with pressure between the spring fixed seat (28) and spring guide holder (27) Spring.

14. seat, it is characterized in that including that back frame and the long stroke leg rest as described in claim 1 to 13 any one stretch Mechanism, the back frame connect seat frame (1).