CN217827280U - Elastic telescopic supporting device for chair and chair - Google Patents

Abstract

The utility model provides an elastic telescopic supporting device for a chair and a chair, which comprises a movable component and a fixed component; the movable member is configured to be movable back and forth relative to the fixed member; the telescopic mechanism is arranged between the movable component and the fixed seat; the telescopic mechanism at least comprises a pair of first sleeve and a second sleeve which are matched in a telescopic sleeving manner; the first sleeve is arranged on the movable component, and the second sleeve is arranged on the fixed seat; the elastic assembly is arranged in the first sleeve and the second sleeve and enables the first sleeve and the second sleeve to elastically stretch and retract; an arm assembly connected between the movable member and the fixed member; the connecting arm assembly comprises a first supporting arm and a second supporting arm which are positioned above the telescopic mechanism and the end parts of which are mutually hinged together; the front end of the first supporting arm is hinged with the movable component; the rear end of the second support arm is hinged with the fixed component; the first support arm and the second support arm rotate relative to each other in response to the telescopic action between the first sleeve and the second sleeve.

Description

Elastic telescopic supporting device for chair and chair

Technical Field

The utility model relates to a thing to sit on field, in particular to elastic stretching strutting arrangement and seat for chair.

Background

The waist rest of the chair is an important part for providing the supporting comfort level of the sitting posture of a human body; the waist rest of the seat in the prior art is generally directly fixed on the back of the seat and cannot be adjusted front and back, so that the requirement of different body shapes of the seat users on the comfort level of the office chair is difficult to meet. In order to effectively provide wider adaptability, the waist support is configured to be adjustable in front-back depth so as to adapt to the waist supporting requirements of different people in sitting postures; however, currently available lumbar adjustment mechanisms on some seats generally have drawbacks.

The utility model discloses a "be applied to waist on office chair and lean on adjusting device" as CN202122877140.5 includes that the waist leans on and the mount pad, the waist leans on and is connected through adjusting device between the mount pad, adjusting device is including being used for the waist to lean on the front and back adjustment mechanism who carries out front and back position control and being used for the waist to lean on the upper and lower adjustment mechanism who carries out position control from top to bottom, front and back adjustment mechanism installs in the mount pad, adjustment mechanism about the action end connection of front and back adjustment mechanism, the waist is leaned on to be connected to upper and lower adjustment mechanism's action end, be equipped with between waist and the mount pad and be used for user's hand to stretch into the operation zone that adjustment mechanism carries out position control around the waist leans on, the simple structure that the waist leaned on, easy and simple operation only need twist adjust knob and promote the waist from top to bottom and lean on, can realize the front and back position control and the upper and lower position control of waist by the waist, can adapt to the crowd of different sizes and use. The waist rest adjusting device adopts a mode of rotating an adjusting knob to adjust the front and back positions of the waist rest, and the adjusting knob is positioned between the seat backrest and the waist rest; when a person sits on the chair, the hand needs to extend backwards to the part between the waist rest and the backrest for adjustment, the moving space of the hand is limited, and the operation is very inconvenient. For children, old people and people with inconvenient joint movement, the adjustment can be carried out even if the chair is away.

In addition, the manually adjusted lumbar support has weak followability, and cannot move after the position of the lumbar support is adjusted; the front and rear positions cannot be changed in accordance with the change of the sitting posture of the user; moreover, users with different body types need to manually adjust the waist support to different using positions repeatedly, and the operation is inconvenient. Moreover, the waist support is a rigid support for the waist of the human body, and even if some waist supports are made of engineering elastic materials, the provided elastic support is limited; not giving the user the best comfort.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide an elastic telescopic supporting device for a chair; the telescopic component is matched with the elastic component; the movable component can elastically stretch relative to the fixed component, and the movable component always has the tendency of resetting forwards; and, still be equipped with the link arm subassembly, make and be connected firmly between movable member and the fixed component.

The chair back can provide elastic support for a user, so that the chair back can always support the back of the user no matter the back of the user moves forwards or backwards; the device can follow the dynamic sitting posture change of a user, and has good follow-up property; no manual adjustment operation is required by the user.

The technical scheme of the utility model is realized like this:

a resiliently retractable support for a chair, comprising: a movable member and a fixed member; the movable member is configured to be movable forward and backward relative to the fixed member; the telescopic mechanism is arranged between the movable component and the fixed seat; the telescopic mechanism at least comprises a pair of first sleeve and a second sleeve which are matched in a telescopic sleeve way; the first sleeve is arranged on the movable component, and the second sleeve is arranged on the fixed seat; the elastic assembly is arranged in the first sleeve and the second sleeve and enables the first sleeve and the second sleeve to elastically stretch and retract; an arm assembly connected between the movable member and the fixed member; the connecting arm assembly comprises a first supporting arm and a second supporting arm which are positioned above the telescopic mechanism and the end parts of which are mutually hinged together; the front end of the first supporting arm is hinged with the movable component; the rear end of the second support arm is hinged with the fixed component; the first support arm and the second support arm correspondingly rotate mutually in response to the telescopic action between the first sleeve and the second sleeve.

Preferably, the elastic component comprises a guide rod arranged along the length direction of the second sleeve and a spring sleeved on the guide rod; the rear end of the guide rod is provided with a connector for limiting the spring, and the connector is inserted into the rear end of the second sleeve; the front end of the guide rod is inserted into the first sleeve, and a limiting bulge for limiting the spring is arranged in the first sleeve; the movable component moves backwards to enable the first sleeve and the second sleeve to contract, and the limiting protrusions extrude and act on the spring to enable the spring to generate elastic deformation.

Preferably, the diameter of the first sleeve is larger than that of the second sleeve, and the first sleeve is sleeved outside the second sleeve in a sliding manner; an inner pipe is arranged in the first sleeve, and the guide rod is inserted in the inner pipe; the limiting protrusion is arranged on the inner pipe, the limiting protrusion is of an annular structure, and the limiting protrusion is configured to limit the spring only. Because the inner diameter of the first sleeve is larger, if the elastic component is directly inserted into the first sleeve, the interval between the first sleeve and the elastic component is larger, and the spring is easy to arch or deflect when the elastic component moves, so that the movement is unstable; thus, an inner pipe is arranged in the first sleeve; the space between the elastic component and the inner tube is small, and the first sleeve and the elastic component move relatively more stably; the limiting protrusion is of an annular structure, can only limit the spring, and does not influence the guide rod to penetrate through.

Preferably, the connector is in sliding fit with the second sleeve; the connector is in sliding fit with the second sleeve; the connector is provided with at least two limiting slide blocks which protrude outwards, and the inner wall of the second sleeve is correspondingly concavely provided with a limiting sliding groove; the rear connector is embedded in the second sleeve in a sliding mode so that the limiting sliding block is in sliding fit with the limiting sliding groove. So that the guide rod can stably slide in the second sleeve through the connector without rotation and deviation.

Preferably, a sliding adjusting assembly is further arranged between the second sleeve and the connector, the sliding adjusting assembly comprises an adjusting knob which is sleeved at the end part of the second sleeve in a threaded manner, and the adjusting knob rotates to move back and forth along the second sleeve; the second sleeve is provided with a guide groove arranged along the length direction of the second sleeve, and the connecting head is connected with a guide pin which is slidably arranged in the guide groove in a penetrating way; the guide pin penetrates through the second sleeve and is limited with the adjusting knob; the adjusting knob moves forwards along the second sleeve to act on the guide pin to drive the connector to move forwards. So that when the movable member does not move relative to the fixed member in the initial state, the adjusting knob can be moved forward relative to the second sleeve by rotating the adjusting knob; the adjusting knob can drive the guide pin to move forwards in the guide groove, so that the connecting head is driven to move forwards to extrude the spring; the tension degree of the spring in the initial state can be adjusted according to users with different weights; the elastic force can be properly felt by users with different weights, the use is comfortable, and the design is more humanized.

Preferably, the connector is detachably connected with the guide pin; a connecting hole is preset in the connecting head, after the connecting head is inserted in the rear end of the second sleeve, the guide pin penetrates through the guide groove from the outside of the second sleeve and is connected in the connecting hole. During assembly, the connector can be inserted into the second sleeve, and then the guide pin is connected with the connector; the connection of the connector and the second sleeve is not affected.

Preferably, a circle of grooves capable of accommodating the guide pins are formed in the front end of the adjusting knob; the guide pin can be embedded in the groove backwards and is propped against the adjusting knob forwards and backwards. The adjusting knob moves forwards to act as the guide pin to move forwards; and the adjusting knob moves backwards, and the spring can act on the connecting head to enable the connecting pin to move backwards.

Preferably, a lock handle for locking or unlocking the first and second swing arms in a swing manner is provided at a hinge joint of the first and second swing arms. So that the movable member can be locked by locking the first and second rotating arms.

Preferably, the first sleeve and the second sleeve are respectively configured as one; the first sleeve is disposed at the center of the rear end of the movable member and the second sleeve is disposed at the center of the front end of the fixed member. So that the supporting effect is better.

A chair comprises a chair back, a chair rod and an elastic telescopic supporting device of the chair; the chair back is fixedly connected with the movable component; the fixing component is fixedly connected with the chair rod.

Preferably, one or two connecting sleeves for being sleeved with the chair rod are arranged on the fixing component. Can be adapted to a seat of a single-seat bar structure or a seat of a double-seat bar structure.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

the elastic telescopic supporting device for the chair of the utility model is characterized in that a telescopic mechanism and an elastic component are arranged between a movable component and a fixed component; the movable component can elastically stretch and retract relative to the fixed component, and the movable component always has the tendency of forward resetting; in addition, a connecting arm assembly is further arranged, so that the movement between the movable component and the fixed component is more stable. The elastic telescopic supporting device can be used on a seat, the movable component is connected with a seat back, and the fixed component is connected with a seat rod; so that the chair back can elastically stretch and retract relative to the chair rod along the front and back directions. Moreover, the chair back can always support the back of the user no matter the back of the user moves forwards or backwards; the device can follow the dynamic sitting posture change of a user, and has good follow-up property; no manual adjustment operation is required by the user.

Secondly, a sliding adjusting component capable of adjusting the connector to move forwards is arranged between the connector and the second sleeve, so that when the movable component does not move relative to the fixed component in the initial state, the adjusting knob can be rotated to move forwards relative to the second sleeve; the adjusting knob can drive the guide pin to move forwards in the guide groove, so that the connecting head is driven to move forwards to extrude the spring; the tension degree of the spring 5b in the initial state can be adjusted according to users with different weights; the user with different weights can feel the right elastic force, the use is comfortable, and the design is more humanized.

Drawings

Fig. 1 is a schematic perspective view of the elastic telescopic supporting device according to the embodiment of the present invention;

fig. 2 is a side view of the elastically telescopic supporting means in an embodiment of the present invention;

fig. 3 is an exploded view of the elastically telescopic supporting device in an embodiment of the present invention;

fig. 4 is a schematic perspective view illustrating a connection between a first sleeve and a second sleeve according to an embodiment of the present invention;

fig. 5 is a schematic perspective view illustrating the elastic member engaged with the second sleeve according to an embodiment of the present invention;

fig. 6 is a side cross-sectional view of the resilient member engaging the first sleeve in an embodiment of the invention;

fig. 7 is a schematic perspective view illustrating the connection between the elastic member and the second sleeve according to an embodiment of the present invention;

fig. 8 is a schematic perspective view illustrating the fitting of the adjusting knob and the second sleeve according to the embodiment of the present invention;

fig. 9 is a schematic perspective view illustrating the cooperation of the guide pin and the adjusting knob according to the embodiment of the present invention.

The figures are numbered: a movable member 1; a fixed member 2; a connection sleeve 2a; a first sleeve 3; a second sleeve 4; an external thread 4a; an elastic member 5; a guide rod 5a; a spring 5b; a first arm 6; a second support arm 7; an inner tube 8; a limiting bulge 9; a connector 10; a limiting slide block 11; a limiting chute 12; an adjusting knob 13; the internal threads 13a; a guide groove 14; a connecting hole 15; a guide pin 16; a groove 17; the handle 18 is locked.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present embodiment relates to reference orientations of components such as front, rear, etc., which are described in a normal use state in which a user is seated behind a seat.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-9, the utility model provides an elastic telescopic supporting device for chair, which comprises a movable member 1 and a fixed member 2, wherein the movable member 1 is located at the front end of the fixed member 2; be equipped with telescopic machanism between activity member 1 and fixed component 2, this telescopic machanism is including setting up the first sleeve pipe 3 at activity member 1 rear end and setting up the second sleeve pipe 4 at fixed component 2 front end, and first sleeve pipe 3 slip cup joints on second sleeve pipe 4 for activity member 1 can be relative fixed component 2 back-and-forth movement. An elastic component 5 is further arranged in the first sleeve 3 and the second sleeve 4, and the elastic component 5 comprises a guide rod 5a arranged along the front-back direction and a spring 5b sleeved on the guide rod 5; the spring 5b can be pressed during the backward movement of the movable member 1 relative to the fixed member 2, so that the movable member 1 has good damping feeling when moving, and the spring 5b can provide elastic force to enable the movable member 1 to reset after moving backward. A connecting arm assembly is also arranged between the movable member 1 and the fixed member 2, and comprises a first supporting arm 6 and a second supporting arm 7 which are positioned above the telescopic mechanism and the ends of which are hinged together; the front end of the first arm 6 is hinged with the movable component 1; the rear end of the second support arm 7 is hinged with the fixed component 2; the first arm 6 and the second arm 7 rotate mutually in response to the telescopic action between the first sleeve 3 and the second sleeve 4; the first arm 6 and the second arm 7 can further improve the supporting strength, so that the movable member 1 can move back and forth relative to the fixed member 2 more stably.

Furthermore, the elastic telescopic supporting device is particularly applied to parts with the function of moving back and forth of the chair, such as a waist rest, a chair back and the like; the method specifically comprises the following steps: the fixed component 2 is fixedly connected with the chair, and the waist support or the chair back is connected with the movable component 1; the waist support or the chair back can provide elastic support for the user, and the waist support and the chair back can always support the waist or the back of the user no matter the back of the user moves forwards or backwards; the device can follow the dynamic sitting posture change of a user, and has good follow-up property; and no manual adjustment operation is required by the user.

Specifically, the method comprises the following steps: the diameter of the first sleeve 3 is larger than the diameter of the second sleeve 4; as shown in fig. 3-6, an inner tube 8 which is contracted relative to the first sleeve 3 is arranged in the first sleeve 3, and the front ends of the guide rod 5a and the spring 5b can be inserted in the inner tube 8; when the first sleeve 3 slides back and forth relative to the second sleeve 4, the guide rod 5a and the spring 5b move back and forth relative to the inner tube 8; because the inner diameter of the first sleeve 3 is larger, if the elastic component 5 is directly inserted into the first sleeve 3, the interval between the two is larger, and the elastic component 5 is easy to arch or deflect the spring 5b when moving, so that the movement is unstable; so that the inner tube 8 is arranged in the first sleeve 3; the space between the elastic component 5 and the inner tube 8 is small, and the relative movement of the first sleeve 3 and the elastic component 5 is more stable. As shown in fig. 5 and 6, the inner tube 8 is further provided with a limiting protrusion 9 protruding toward the center, the limiting protrusion 9 is of an annular structure, and the limiting protrusion 9 is only configured to limit the spring 5b without limiting the movement of the guide rod 5a; when the movable component 1 slides backwards from the initial position, the limiting bulge 9 can not limit the movement of the guide rod 5a, and the guide rod 5a can relatively pass through the limiting bulge 9 forwards; the limiting bulge 9 is abutted with the spring 5b in a front-back manner, so that the spring 5b is extruded to be compressed and deformed; the spring 5b is elastically deformed to provide an elastic force to return the movable member 1 forward again.

As shown in fig. 3-8, a connector 10 protruding outward relative to the circumference of the guide rod 5a is provided at the rear end of the guide rod 5a, and the connector 10 can limit the rear end of the spring 5b; the rear end of the guide rod 5a is inserted in the second sleeve 4, and the connector 10 is in sliding fit with the second sleeve 4; the method specifically comprises the following steps: two sides of the connector 10 are respectively provided with a limiting slide block 11 protruding outwards, and correspondingly, the inner wall of the second sleeve 4 is also provided with a limiting slide groove 12 arranged along the length direction; the connector 10 is embedded in the second sleeve 4 in a sliding manner so that the limiting slide block 11 is in sliding fit with the limiting slide groove 12; then under the sliding fit action of the connector 10 and the second sleeve 4, the elastic component 5 can stably slide back and forth in the second sleeve 4 without deflection, so that the structure is stable. And as illustrated in fig. 8, the length of said second sleeve 4 is greater than or equal to the length of the spring 5b, so that the elastic member 5 can be substantially completely inserted inside the second sleeve 4; so that the elastic component is not exposed outside in the process of extension and retraction.

As shown in fig. 4-9, the connector 10 is located at the rear end of the second sleeve 4, a sliding adjusting assembly capable of moving the connector 10 is further disposed between the second sleeve 4 and the connector 10, the sliding adjusting assembly includes an adjusting knob 13 sleeved at the rear end of the second sleeve 4, the rear end of the second sleeve 4 is provided with an external thread 4a, the adjusting knob 13 is provided with an internal thread 13a, and the adjusting knob 13 is in threaded connection with the second sleeve 4; then, the adjusting knob 13 can be moved back and forth along the second sleeve 4 and stay at any position by rotating the adjusting knob 13. The rear end of the second sleeve 4 is also provided with a guide groove 14 extending along the front-rear direction, a connecting hole 15 with internal threads is preset on the connecting head 10, after the connecting head 10 is inserted into the second sleeve 4, a guide pin 15 passes through the guide groove 14 from the outside of the second sleeve 4 and is connected into the connecting hole 15, and the guide pin 16 is a screw rod, so that the guide pin 16 is only required to be connected onto the connecting head 10 in a threaded manner; the design is ingenious, and the connection of the elastic component 5 is not interfered. After the guide pin 16 is connected, the guide pin 16 partially penetrates out of the second sleeve 4; a circle of grooves 17 capable of accommodating the guide pins 16 are formed at the front end of the adjusting knob 13; after the adjusting knob 13 is connected to the second sleeve 4, the guide pin 16 can be embedded in the groove 17, and the guide pin 16 abuts against the adjusting knob 13 front and back. Then, by means of the sliding adjustment assembly, when the movable member 1 does not move relative to the fixed member 2 in the initial state, the adjustment knob 13 can be moved forward relative to the second sleeve 4 by rotating the adjustment knob 13; the adjusting knob 13 can drive the guide pin 16 to move forwards in the guide groove 14, so that the connecting head 10 is driven to move forwards to press the spring 5b; and when the adjusting knob 13 moves backwards, the spring 5b can act on the connecting head 10 to reset the connecting head 10 backwards. The tension degree of the spring 5b in the initial state can be adjusted according to users with different weights; the user with different weights can feel the right elastic force, the use is comfortable, and the design is more humanized.

Furthermore, as shown in fig. 1 and 2, the first sleeve 3 and the first arm 6 are both disposed at the center of the movable member 1; the second sleeve 4 and the second support arm 7 are both arranged at the central position of the fixed member 2; and the first sleeve 3, the second sleeve 4, the first support arm 6 and the second support arm 7 are integrally in a triangle-like structure, so that the structural strength between the movable member 1 and the fixed member 2 is better, and the stability of the movable member 1 is better. Furthermore, a locking handle 18 which can lock or unlock the first support arm 6 and the second support arm 7 in a rotating way is arranged at the hinged position of the two support arms; in the unlocking state, the first support arm 6 and the second support arm 7 can freely rotate; in the locking state, the first support arm 6 and the second support arm 7 can be mutually extruded by pulling the locking handle 18, and the rotation of the two is limited by the friction force between the two; then, the movable member 1 can freely and elastically extend and contract relative to the fixed member 2, and if the movable member 1 needs to be locked at a certain fixed position, only the locking handle 18 needs to be used to enable the first support arm 6 and the second support arm 7 to be rotationally locked, so that the locking is very convenient.

The utility model further provides a chair (not shown), which comprises a chair back, a chair rod and the elastic telescopic supporting device for the chair; wherein, the chair back is fixedly connected with the front end of the movable component 1; the fixing component 2 is provided with a connecting sleeve 2a, and the connecting sleeve 2a is configured to be sleeved on the chair rod; thereby enabling the chair back to elastically stretch and retract relative to the chair rod along the front and back directions. Correspondingly, the chair back can provide elastic support for the user, so that the chair back can always support the back of the user no matter the back of the user moves forwards or backwards; the device can follow the dynamic sitting posture change of a user, and has good follow-up property; no manual adjustment operation is required by the user.

Furthermore, one or two connection sleeves 2a can be provided on the fixing member 2 so as to be adapted to a seat of a single-seat bar structure or a seat of a double-seat bar structure.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art should understand that without departing from the spirit of the present invention, the person skilled in the art should not inventively design the similar structural modes and embodiments to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (10)

1. An elastically stretchable supporting apparatus for a chair, comprising:

a movable member and a fixed member; the movable member is configured to be movable forward and backward relative to the fixed member;

the telescopic mechanism is arranged between the movable component and the fixed seat; the telescopic mechanism at least comprises a pair of first sleeve and a second sleeve which are matched in a telescopic sleeve way; the first sleeve is arranged on the movable member, and the second sleeve is arranged on the fixed seat;

the elastic assembly is arranged in the first sleeve and the second sleeve and enables the first sleeve and the second sleeve to elastically stretch and retract;

an arm assembly connected between the movable member and the fixed member; the connecting arm component comprises a first supporting arm and a second supporting arm which are positioned above the telescopic mechanism and the end parts of which are mutually hinged together; the front end of the first supporting arm is hinged with the movable component; the rear end of the second support arm is hinged with the fixed component; the first support arm and the second support arm rotate relative to each other in response to the telescopic action between the first sleeve and the second sleeve.

2. The elastically stretchable support device for a chair according to claim 1, wherein: the elastic component comprises a guide rod arranged along the length direction of the second sleeve and a spring sleeved on the guide rod; the rear end of the guide rod is provided with a connector for limiting the spring, and the connector is inserted into the rear end of the second sleeve; the front end of the guide rod is inserted in the first sleeve, and a limiting bulge for limiting the spring is arranged in the first sleeve; the movable component moves backwards to enable the first sleeve and the second sleeve to contract, and the limiting protrusions extrude and act on the spring to enable the spring to generate elastic deformation.

3. The elastically stretchable support device for a chair according to claim 2, wherein: the diameter of the first sleeve is larger than that of the second sleeve, and the first sleeve is sleeved outside the second sleeve in a sliding manner; an inner pipe is arranged in the first sleeve, and the guide rod is inserted in the inner pipe; the limiting protrusion is arranged on the inner pipe and is of an annular structure, and the limiting protrusion is configured to limit the spring only.

4. The elastically stretchable support device for a chair according to claim 2, wherein: the connector is in sliding fit with the second sleeve; the connector is in sliding fit with the second sleeve; the connector is provided with at least two limiting slide blocks which protrude outwards, and the inner wall of the second sleeve is correspondingly concavely provided with a limiting sliding groove; the rear connector is embedded in the second sleeve in a sliding mode so that the limiting sliding block is in sliding fit with the limiting sliding groove.

5. The elastically stretchable support device for a chair according to claim 2, wherein: a sliding adjusting component is also arranged between the second sleeve and the connector, the sliding adjusting component comprises an adjusting knob which is sleeved at the end part of the second sleeve in a threaded manner, and the adjusting knob rotates to move back and forth along the second sleeve; the second sleeve is provided with a guide groove arranged along the length direction of the second sleeve, and the connecting head is connected with a guide pin which is slidably arranged in the guide groove in a penetrating way; the guide pin penetrates through the second sleeve and is limited with the adjusting knob; the adjusting knob moves forwards along the second sleeve to act on the guide pin to drive the connector to move forwards.

6. The elastically stretchable support device for a chair according to claim 5, wherein: the connector is detachably connected with the guide pin; a connecting hole is preset in the connecting head, after the connecting head is inserted in the rear end of the second sleeve, the guide pin penetrates through the guide groove from the outside of the second sleeve and is connected in the connecting hole.

7. The elastically stretchable support device for a chair according to claim 5, wherein: a circle of grooves capable of accommodating the guide pins are formed in the front end of the adjusting knob; the guide pin can be embedded into the groove backwards and is propped against the adjusting knob forwards and backwards.

8. The elastically stretchable support device for a chair according to claim 1, wherein: and a locking handle for locking or unlocking the first rotating arm and the second rotating arm in a rotating way is arranged at the hinged part of the first rotating arm and the second rotating arm.

9. The elastically stretchable supporting apparatus for a chair according to claim 1, wherein: the first sleeve and the second sleeve are respectively configured into one; the first sleeve is disposed at the center of the rear end of the movable member and the second sleeve is disposed at the center of the front end of the fixed member.

10. A seat, characterized by: comprising a chair back, a chair bar and a resiliently retractable support means for a chair as claimed in any one of claims 1 to 9; the chair back is fixedly connected with the movable component; the fixing component is fixedly connected with the chair rod, and one or two connecting sleeves used for being sleeved with the chair rod are arranged on the fixing component.

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