CN221997375U - Linkage telescopic unit and seat support - Google Patents

Abstract

The utility model discloses a linkage telescopic unit and a seat support, which comprise a support assembly with a base and a support piece; the linkage assembly comprises a first linkage piece, a second linkage piece, a third linkage piece and a fourth linkage piece; the backrest assembly is hinged with the support piece; the leg assembly is hinged between the leg assembly and the backrest assembly respectively; the third linkage piece is hinged between the backrest component and the supporting piece and used for driving or following the backrest component to shrink or stretch, the fourth linkage piece is hinged between the first linkage piece and the leg component and used for driving or following the leg component to shrink or stretch, and the power source of the backrest component or the third linkage piece and the power source of the leg component or the fourth linkage piece are mutually independent. The utility model adopts the third linkage piece and the fourth linkage piece to respectively control the backrest component and the leg component, so that the contraction or the expansion between the backrest component and the leg component is not interfered, and the sitting posture, the leisure posture, the lying posture and the lying posture can be completed.

Description

Linkage telescopic unit and seat support

Technical Field

The utility model relates to the technical field related to seat supports, in particular to a linkage telescopic unit and a seat support.

Background

A variety of seating supports for use in movable seating, such as sofas or seats with multiple position changing functions, are known in the art. Along with the improvement of the living standard of people, the comfort requirements on sofas and seats are also increasingly improved. In known designs, the movable seat support is generally provided with mechanical extension means capable of being shifted between a sitting, a resting (i.e. TV) and a lying position, the footrest of the leg assembly extending forward when the seat unit is shifted from the sitting to the resting position, the angle between the backrest assembly and the seat being substantially unchanged, and the footrest being further raised forward and upward from the resting position when the seat unit is shifted from the resting to the lying position, the backrest assembly being affected by the linkage to achieve a significant recline, due to the linkage effect, thereby completing the lying position of the seat unit.

In the above-mentioned seat support, shank subassembly and back subassembly are provided with gangbar or linkage piece and connect generally, realize the linkage effect, and this just causes the seat support when lying down, and the foot rest must be in the lifting position, is unfriendly to some people who custom position of sitting the position of lying down, and can't realize the position of sitting and lie down the effect.

Disclosure of utility model

In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present utility model provides a linkage telescoping unit and a seat support. The third linkage piece and the fourth linkage piece are adopted to respectively control the backrest component and the leg component, so that the contraction or the expansion between the backrest component and the leg component is not interfered, and the sitting posture, the leisure posture, the lying posture and the sitting posture lying down can be completed, thereby meeting the requirements of users.

The utility model adopts the technical proposal for solving the problems that:

A ganged telescoping unit comprising: a support assembly including a base and a support connected to each other; the linkage assembly comprises a first linkage piece, a second linkage piece, a third linkage piece and a fourth linkage piece; a back assembly hinged to the support; a leg assembly, the first and second linkages being hinged between the leg assembly and the backrest assembly, respectively; the third linkage piece is hinged between the backrest component and the supporting piece and used for driving or following the backrest component to shrink or stretch, the fourth linkage piece is hinged between the first linkage piece and the leg component and used for driving or following the leg component to shrink or stretch, and the backrest component or the power source of the third linkage piece and the power source of the leg component or the power source of the fourth linkage piece are mutually independent.

Through adopting above-mentioned scheme, accessible third linkage spare and fourth linkage spare realize the shrink or the extension of back subassembly and shank subassembly respectively, avoid there being forced linkage effect between the two, and then can realize four states of flexible unit.

Further, the third linkage member includes a first linkage rod and a second linkage rod, the rear end of the first linkage rod is hinged to the backrest assembly, the front end of the first linkage rod is hinged to the upper end of the second linkage rod, and the lower end of the second linkage rod is hinged to the support member.

By adopting the scheme, the rotation between the first linkage rod and the second linkage rod can be changed along with the change of the backrest component, so that the independent telescopic effect of the backrest component is realized.

Further, the backrest assembly includes: the first backrest piece comprises a backrest first hinge point, a backrest second hinge point and a backrest third hinge point, the rear end of the first linkage rod is hinged to the backrest first hinge point, and the first linkage piece is hinged to the backrest second hinge point; the second backrest piece comprises a backrest fourth hinge point, a backrest fifth hinge point and a backrest sixth hinge point, wherein the backrest fourth hinge point is hinged with the backrest third hinge point, the supporting piece is hinged with the backrest fifth hinge point, and the rear end of the second linkage piece is hinged with the backrest sixth hinge point.

By adopting the scheme, the first backrest part and the second backrest part in the backrest assembly can be expanded or contracted, so that the backrest assembly can be freely switched between the standing state and the lying state.

Further, the second backrest part further comprises a backrest seventh hinge point, the backrest seventh hinge point is hinged with a first auxiliary rod, and a second auxiliary rod is hinged between the first auxiliary rod and the supporting part.

By adopting the scheme, the stability of the backrest assembly in switching between the standing state and the lying state is improved, the maximum extension and contraction range of the backrest assembly is limited, and the safety of the seat is improved.

Further, the fourth linkage member comprises a third linkage rod and a fourth linkage rod, the front end of the third linkage rod is hinged to the leg assembly, the rear end of the third linkage rod is hinged to the front end of the fourth linkage rod, and the rear end of the fourth linkage rod is hinged to the first linkage member.

By adopting the scheme, the expansion and contraction between the third linkage rod and the fourth linkage rod can be realized, so that the foot rest of the leg assembly is switched between the lifting state and the descending state.

Further, the leg assembly includes a first leg bar, a second leg bar, a third leg bar, a fourth leg bar, and a leg rest, a rear end of the first leg bar is hinged with the first link, a front end of the first leg bar is hinged with a rear end of the second leg bar, a rear end of the third leg bar is hinged with the first link, a front end of the third leg bar is hinged with a rear end of the fourth leg bar, and the second leg bar and the fourth leg bar are respectively hinged with the leg rest at front ends thereof.

By adopting the scheme, the expansion and contraction state of the leg assembly can be realized, and then the lifting and the descending of the foot rest are realized.

Further, a first leg hinge point and a second leg hinge point are arranged in the middle of the third leg rod, the front end of the third linkage rod is hinged to the first leg hinge point, and the front end of the second linkage member is hinged to the second leg hinge point.

By adopting the scheme, the stability of the leg assembly in switching between the extension state and the contraction state can be improved.

Further, a first hinge point of the linkage piece and a second hinge point of the linkage piece are arranged in the middle of the first linkage piece, the rear end of the third leg rod is hinged to the first hinge point of the linkage piece, and the rear end of the fourth linkage rod is hinged to the second hinge point of the linkage piece.

By adopting the scheme, the hinge effect with the fourth linkage rod and the third leg rod can be realized.

Further, the base includes: the supporting plate is fixedly connected with the supporting piece; the bottom bracket is arranged below the supporting plate; the heightening piece is fixedly connected between the supporting plate and the underframe; the buffer piece is arranged beside the heightening piece and acts on the space between the supporting plate and the underframe respectively.

Through adopting above-mentioned scheme, can be for the backup pad provides certain support and cushioning effect, improves user experience.

The seat support comprises at least two groups of linkage telescopic units, wherein a fixed rod is connected between supporting pieces in two adjacent groups of linkage telescopic units, and a rotating square tube is arranged between first linkage pieces in two adjacent groups of linkage telescopic units.

By adopting the scheme, the linkage effect of at least two groups of linkage telescopic units can be realized.

In summary, the linkage telescopic unit and the seat support provided by the utility model have the following technical effects:

1. By the design of the third linkage piece and the fourth linkage piece, the contraction or the expansion of the backrest component and the leg component can be respectively realized, so that the forced linkage effect is avoided, and more state choices including sitting posture lying down are provided;

2. The leg assembly is designed so that the footrests can be switched between a lifting state and a descending state to meet different requirements;

3. Through the design of the first auxiliary rod and the second auxiliary rod, the stability of the backrest assembly in switching between the standing state and the lying state is improved, the maximum extension and retraction range is limited, and the safety of the seat is improved;

4. Through the arrangement of the fixed rod and the rotating square tube, the linkage of a plurality of groups of linkage telescopic units can be realized, and the flexibility and the applicability of the seat are improved;

5. The backup pad in the support piece, increase and bolster can provide support and cushioning effect for the seat, promotes user experience.

Drawings

FIG. 1 is a schematic diagram of a sitting posture side configuration of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a sitting position lying side view of an embodiment of the present utility model;

FIG. 3 is a schematic side view of a TV gesture according to an embodiment of the present utility model;

FIG. 4 is a schematic side view of a recumbent side structure of an embodiment of the present utility model;

FIG. 5 is a schematic perspective view of a sitting posture according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a sitting position lying perspective view of an embodiment of the utility model;

fig. 7 is a schematic view of a TV pose in a stereoscopic structure according to an embodiment of the present utility model;

FIG. 8 is a perspective view of a recumbent posture according to an embodiment of the present utility model

Fig. 9 is a schematic perspective view of a support assembly according to an embodiment of the utility model

Fig. 10 is a schematic diagram of a linkage structure of a leg assembly and a fourth linkage according to an embodiment of the present utility model

Fig. 11 is a schematic diagram of a linkage structure of a backrest assembly and a third linkage member according to an embodiment of the utility model.

Wherein the reference numerals have the following meanings: 1. a support assembly; 11. a base; 111. a foot rest; 112. a connecting rib; 113. a support plate; 114. a heightening member; 12. a support; 13. a buffer member; 2. a linkage assembly; 21. a first linkage member; 211. a first hinge point of the linkage member; 212. the second hinge point of the linkage piece; 22. a second linkage member; 23. a third linkage member; 231. a first linkage rod; 232. a second linkage rod; 24. a fourth linkage; 241. a third linkage rod; 242. a fourth link lever; 3. a backrest assembly; 31. a first backrest member; 311. a first hinge point of the backrest; 312. a second hinge point of the backrest; 313. a third hinge point of the backrest; 32. a second backrest member; 321. a fourth hinge point of the backrest; 322. a fifth hinge point of the backrest; 323. a sixth hinge point of the backrest; 324. a seventh hinge point of the backrest; 33. a first auxiliary lever; 34. a second auxiliary lever; 4. a leg assembly; 41. a first leg bar; 411. a limit structure; 42. a second leg bar; 43. a third leg bar; 431. a leg first hinge point; 432. a leg second hinge point; 44. a fourth leg bar; 45. a foot rest; 5. a fixed rod; 6. and rotating the square tube.

Detailed Description

For a better understanding and implementation, the technical solutions of the embodiments of the present utility model will be clearly and completely described and discussed below in conjunction with the accompanying drawings, and it is apparent that what is described herein is only a part, but not all, of the examples of the present utility model, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.

For the purpose of facilitating an understanding of the embodiments of the present utility model, reference will now be made to the drawings, by way of example, of specific embodiments, and the various embodiments should not be construed to limit the embodiments of the utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

1-11, A linkage telescopic unit is disclosed, comprising a support assembly 1, a linkage assembly 2, a backrest assembly 3 and a leg assembly 4, wherein the support assembly 1 comprises a base 11 and a support 12 which are connected with each other, the linkage assembly 2 comprises a first linkage member 21, a second linkage member 22, a third linkage member 23 and a fourth linkage member 24, the backrest assembly 3 is hinged with the support 12, and the first linkage member 21 and the second linkage member 22 are respectively hinged between the leg assembly 4 and the backrest assembly 3; the third linkage member 23 is hinged between the backrest assembly 3 and the support member 12, and is used for driving or following the backrest assembly 3 to shrink or stretch, the fourth linkage member 24 is hinged between the first linkage member 21 and the leg assembly 4, and is used for driving or following the leg assembly 4 to shrink or stretch, the shrinkage or stretching of the backrest assembly 3 and the leg assembly 4 can be respectively realized through the third linkage member 23 and the fourth linkage member 24, a forced linkage effect is avoided between the third linkage member 23 and the leg assembly 4, a power source of the backrest assembly 3 or the third linkage member 23 and a power source of the leg assembly 4 or the fourth linkage member 24 are mutually independent, the power sources include, but are not limited to, a power effect caused by manual driving and motor driving, a common manual driving mode is that the power source directly acts on a sofa surface, and a motor driving mode is that the power source directly acts on the third linkage member 23 or the fourth linkage member 24. The following four states of the telescopic unit can thus be achieved: the first state is a sitting state, as shown in fig. 1 and 5, in which the backrest module 3 and the leg module 4 are retracted; the second state is a sitting, lying down state, as shown in figures 2 and 6, in which the backrest module 3 is extended and the leg module 4 is contracted; the third state is a TV position, as shown in fig. 3 and 7, in which the backrest module 3 is retracted and the leg module 4 is extended; the fourth state is a fully reclined state, as described with reference to fig. 4 and 8, with both the backrest assembly 3 and the leg assembly 4 extended.

In order to better achieve the purpose of switching the two states of the leg assembly 4, in this embodiment 1, referring to fig. 10, the fourth link 24 includes a third link lever 241 and a fourth link lever 242, a first link lever first hinge point 211 and a second link lever second hinge point 212 are disposed in the middle of the first link 21, the leg assembly 4 includes a first leg lever 41, a second leg lever 42, a third leg lever 43, a fourth leg lever 44 and a leg rest 45, the rear end of the first leg lever 41 is hinged to the front end of the first link lever 21, the front end of the first leg lever 41 is hinged to the rear end of the second leg lever 42, the rear end of the third leg lever 43 is hinged to the first hinge point 211 of the first link lever 21, the front end of the third leg lever 43 is hinged to the rear end of the fourth leg lever 44, and the second leg lever 42 and the fourth leg lever 44 are respectively hinged to the front end of the first link lever 42, and the leg rest 45 are further raised and lowered to the leg assembly 45. The middle part of the third leg rod 43 is provided with a first leg hinge point 431 and a second leg hinge point 432, the front end of the third linkage rod 241 is hinged to the first leg hinge point 431 of the leg assembly 4, the front end of the second linkage member 22 is hinged to the second leg hinge point 432, the rear end of the third linkage rod 241 is hinged to the front end of the fourth linkage rod 242, and the rear end of the fourth linkage rod 242 is hinged to the second hinge point 212 of the linkage member of the first linkage member 21, so that the leg rest 45 of the leg assembly 4 is switched between the raised state and the lowered state.

In order to better achieve the purpose of switching the two states of the backrest assembly 3, the third link 23 is described in detail, and in this embodiment 1, referring to fig. 11, the third link 23 includes a first link lever 231 and a second link lever 232, the backrest assembly 3 includes a first backrest member 31 and a second backrest member 32, the first backrest member 31 includes a backrest first hinge point 311, a backrest second hinge point 312, and a backrest third hinge point 313, and the second backrest member 32 includes a backrest fourth hinge point 321, a backrest fifth hinge point 322, and a backrest sixth hinge point 323. The rear end of the first link 231 is hinged to a first hinge point 311 of the backrest assembly 3, the rear end of the first link 21 is hinged to a second hinge point 312 of the backrest assembly 3, a fourth hinge point 321 of the backrest is hinged to a third hinge point 313 of the backrest, the support 12 is hinged to a fifth hinge point 322 of the backrest, and the rear end of the second link 22 is hinged to a sixth hinge point 323 of the backrest, so that the first and second backrest members 31 and 3 of the backrest assembly 3 can be extended or contracted to freely switch the backrest assembly 3 between an upright and a reclined state. The front end of the first linkage rod 231 is hinged to the upper end of the second linkage rod 232, and the lower end of the second linkage rod 232 is hinged to the supporting member 12, so that rotation between the first linkage rod 231 and the second linkage rod 232 can be changed along with the change of the backrest assembly 3, and the independent telescopic effect of the backrest assembly 3 is achieved.

In some embodiments, referring to fig. 11, in order to improve the stability of the backrest module 3 in switching between the upright and reclined states, a seventh hinge point 324 of the backrest is further provided on the second backrest member 32, the seventh hinge point 324 of the backrest is hinged with a first auxiliary lever 33, and a second auxiliary lever 34 is hinged between the first auxiliary lever 33 and the support member 12, so that the maximum range of extension and retraction of the backrest module 3 can be limited while improving the stability of the backrest module 3 in switching between the upright and reclined states, thereby improving the safety of the seat.

The present utility model also designs a seat support, which comprises at least two groups of linkage expansion units, as shown in fig. 5-8, wherein in this embodiment 1, two groups of linkage expansion units are provided, a fixing rod 5 is connected between the supporting members 12 in two adjacent groups of linkage expansion units, a rotating square tube 6 is provided between the first linkage members 21 in two adjacent groups of linkage expansion units, so that the linkage effect of at least two groups of linkage expansion units can be achieved, and specifically, the rotating square tube 6 passes through the two first linkage members 21 and is fixedly connected with the rear end of the fourth linkage rod 242.

In order to improve the support stability of the seat support, as shown in fig. 9, the base 11 includes a chassis, a support plate 121 and a height increasing member 122, the chassis includes at least two foot frames 111, and at least two connecting ribs 112 are disposed between the two foot frames 111, so as to improve the fixing effect of the foot frames 111 and further improve the support stability of the chassis. In this embodiment 1, two supporting members 12 are provided, one supporting plate 121 and one heightening member 122 are provided below each supporting member 12, each supporting plate 121 is an L-shaped plate, the upper half of the L-shaped plate of each supporting plate 121 is connected with the supporting member 12, the connection manner includes, but is not limited to, integral connection, welding or screw connection, the lower half of the L-shaped plate of each supporting plate 121 is connected with the heightening member 122, the connection manner includes, but is not limited to, integral connection, welding or screw connection, the bottom end of each heightening member 122 is fixed on the base 11, the fixation manner includes, but is not limited to, welding or screw connection, and since each supporting plate 121 is connected with one supporting member 12, each supporting plate 121 corresponds to one set of linkage telescoping units, a fixing rod 5 is connected between the supporting plates 121 in two adjacent sets of linkage telescoping units, and the two ends of the fixing rod 5 can also be fixed with the supporting member 12 through the supporting plates 121. The shape of the elevating member 122 is not particularly limited, and may be integrally formed with the support plate 121.

In order to improve the buffering capacity of the seat support, as shown in fig. 9, in some embodiments, a buffer member 13 is further added, where the buffer member 13 is disposed adjacent to the height-increasing member 122 and acts on the lower portion of the fixing rod 5 of the support plate 121 and the upper portion of the connecting rib 112 of the base 11, so as to provide a certain supporting and buffering function for the support plate 121, thereby improving the user experience; in embodiment 1, the shock-resistant spring is preferably used for the shock-absorbing member 13. If the buffer member 13 is not required, the mounting of the elevating member 122 may be omitted, and the support plate 121 may be directly connected to the base 11.

In order to enable the backrest component 3 and the leg component 4 to realize intelligent extension and contraction, in some embodiments, two driving motors may be added, where the driving motors include, but are not limited to, a slider motor or a telescopic rod motor, and the respective control on the backrest component 3 and the leg component 4 may be realized through the driving motors, so as to realize intelligent control.

In some embodiments, a return spring may also be provided between the backrest assembly 3 and the third linkage 23 to assist in the assisted retraction of the backrest; preferably, the return spring is connected between the first link lever 231 and the support member 12, or between the first link lever 231 and the second backrest member 32.

When the user uses, the seat is in a sitting posture state, the user sits on the seat, and when the user needs to lie down in a sitting posture, the first backrest piece 31 and the second backrest piece 32 in the backrest assembly 3 are rotated and stretched through the driving motor or manual adjustment, so that the first backrest piece 31 rotates towards the rear end to realize lying down. When the user needs to lie, the leg assembly 4 is extended by a drive motor or manual adjustment to achieve a fully reclined state. When the user needs the TV gesture, the first backrest piece 31 and the second backrest piece 32 in the backrest assembly 3 are rotated and contracted by the driving motor or manual adjustment, so that the first backrest piece 31 rotates towards the money end to realize the standing effect, and the conversion of the TV gesture is completed.

In summary, the linkage telescopic unit and the seat support provided by the utility model have the following technical effects:

1. By the design of the third and fourth linkage members 23, 24, the retraction or extension of the backrest and leg assemblies 3, 4, respectively, can be achieved, thereby avoiding forced linkage effects, providing more state options, including sitting recline;

2. the design of leg assembly 4 enables footrests 45 to be switched between raised and lowered conditions to meet different requirements;

3. By the design of the first auxiliary lever 33 and the second auxiliary lever 34, the stability of the backrest module 3 in switching between the standing and lying states is improved, the maximum range of extension and contraction is limited, and the safety of the seat is increased;

4. Through the arrangement of the fixed rod 5 and the rotary square tube 6, the linkage of a plurality of groups of linkage telescopic units can be realized, and the flexibility and the applicability of the seat are improved;

5. The supporting plate 121, the heightening element 122 and the buffer element 13 in the supporting element 12 can provide supporting and buffering functions for the seat, so that the user experience is improved.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (10)

1. A ganged telescoping unit comprising:

-a support assembly (1), the support assembly (1) comprising a base (11) and a support (12) connected to each other;

a linkage assembly (2), wherein the linkage assembly (2) comprises a first linkage piece (21), a second linkage piece (22), a third linkage piece (23) and a fourth linkage piece (24);

-a backrest assembly (3), the backrest assembly (3) being hinged to the support (12);

-a leg assembly (4), the first and second linkage members (21, 22) being hinged between the leg assembly (4) and the backrest assembly (3), respectively;

The third linkage piece (23) is hinged between the backrest component (3) and the supporting piece (12) and is used for driving or following the backrest component (3) to shrink or stretch, the fourth linkage piece (24) is hinged between the first linkage piece (21) and the leg component (4) and is used for driving or following the leg component (4) to shrink or stretch, and the power source of the backrest component (3) or the third linkage piece (23) and the power source of the leg component (4) or the fourth linkage piece (24) are mutually independent.

2. A linked telescopic unit according to claim 1, wherein the third linkage member (23) comprises a first linkage rod (231) and a second linkage rod (232), the rear end of the first linkage rod (231) is hinged to the backrest assembly (3), the front end of the first linkage rod (231) is hinged to the upper end of the second linkage rod (232), and the lower end of the second linkage rod (232) is hinged to the support member (12).

3. A ganged telescopic unit as claimed in claim 2, wherein the backrest assembly (3) comprises:

A first backrest (31), the first backrest (31) comprising a backrest first hinge point (311), a backrest second hinge point (312) and a backrest third hinge point (313), the rear end of the first linkage rod (231) being hinged to the backrest first hinge point (311), the first linkage (21) being hinged to the backrest second hinge point (312);

The second backrest (32) comprises a backrest fourth hinge point (321), a backrest fifth hinge point (322) and a backrest sixth hinge point (323), wherein the backrest fourth hinge point (321) is hinged with the backrest third hinge point (313), the support (12) is hinged with the backrest fifth hinge point (322), and the rear end of the second linkage (22) is hinged with the backrest sixth hinge point (323).

4. A linked telescopic unit according to claim 3, wherein the second backrest member (32) further comprises a seventh backrest hinge point (324), the seventh backrest hinge point (324) being hinged with a first auxiliary rod (33), and a second auxiliary rod (34) being hinged between the first auxiliary rod (33) and the support member (12).

5. A linkage telescopic unit according to claim 1, wherein the fourth linkage member (24) comprises a third linkage rod (241) and a fourth linkage rod (242), the front end of the third linkage rod (241) being hinged to the leg assembly (4), the rear end of the third linkage rod (241) being hinged to the front end of the fourth linkage rod (242), the rear end of the fourth linkage rod (242) being hinged to the first linkage member (21).

6. A linked telescopic unit according to claim 5, wherein the leg assembly (4) comprises a first leg bar (41), a second leg bar (42), a third leg bar (43), a fourth leg bar (44) and a foot rest (45), the rear end of the first leg bar (41) being hinged to the first linkage (21), the front end of the first leg bar (41) being hinged to the rear end of the second leg bar (42), the rear end of the third leg bar (43) being hinged to the first linkage (21), the front end of the third leg bar (43) being hinged to the rear end of the fourth leg bar (44), the second leg bar (42) and the fourth leg bar (44) being hinged to the foot rest (45) at their front ends, respectively.

7. A ganged telescopic unit as claimed in claim 6, wherein a first leg hinge point (431) and a second leg hinge point (432) are provided in the middle of the third leg lever (43), the front end of the third ganged lever (241) is hinged to the first leg hinge point (431), and the front end of the second ganged member (22) is hinged to the second leg hinge point (432).

8. The linkage telescopic unit according to claim 6, wherein a first hinge point (211) of the linkage member and a second hinge point (212) of the linkage member are arranged in the middle of the first linkage member (21), the rear end of the third leg rod (43) is hinged to the first hinge point (211) of the linkage member, and the rear end of the fourth linkage rod (242) is hinged to the second hinge point (212) of the linkage member.

9. A ganged telescopic unit as claimed in any one of claims 1 to 8, wherein the base (11) comprises:

A support plate (121), the support plate (121) being fixedly connected to the support (12);

A bottom frame arranged below the support plate (121);

The heightening piece (122), the heightening piece (122) is fixedly connected between the supporting plate (121) and the underframe;

The buffer piece (13), the buffer piece (13) is located just next to increase piece (122), and act on respectively backup pad (121) with between the chassis.

10. A seat support comprising at least two sets of linked telescopic units according to any one of claims 1-8, wherein a fixed rod (5) is connected between the support members (12) in two adjacent sets of linked telescopic units, and a rotating square tube (6) is arranged between the first linkage members (21) in two adjacent sets of linked telescopic units.