CN212591134U

CN212591134U - Adjustable seat support

Info

Publication number: CN212591134U
Application number: CN202021019586.3U
Authority: CN
Inventors: 李晓鸿; 傅豪; 钱威
Original assignee: Remacro Machinery and Technology Wujiang Co Ltd
Current assignee: Ruimai Technology Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-02-26
Anticipated expiration: 2030-06-05

Abstract

The utility model relates to an adjustable seat support, which comprises a backrest support, a seat support and a leg support which are connected in sequence, wherein the seat support comprises a seat frame, a seat linkage frame, a seat connecting rod assembly, a fixed seat and a gravity adjusting device; one end of the seat linkage frame is used for being connected with the leg support, the other end of the seat linkage frame is rotatably connected with the seat frame through a seat connecting rod assembly, one end of the fixed seat is rotatably connected with the seat linkage frame, and the other end of the fixed seat is used for being connected with the seat base; the gravity adjusting device comprises a gravity driving piece and a driving connecting piece, one end of the gravity driving piece is hinged to the fixing seat, the other end of the gravity driving piece is connected with the driving connecting piece, the driving connecting piece is connected with the seat linkage frame, and the gravity adjusting device is used for adjusting the seat support to be higher than the height above the ground of the highest point of the leg support. The utility model discloses zero gravity appearance can be adjusted to the seat support, makes health pressure at the buttock, reduces blood circulation's pressure and improves use comfort.

Description

Adjustable seat support

Technical Field

The utility model relates to a multi-functional sofa seat technical field especially relates to an adjustable seat support.

Background

With the continuous improvement of economic life, multifunctional seats are more and more popular in daily life. Sofas at home, lounge chairs, seats at theaters, seats in traffic, office chairs, etc. With the increasing importance of physical and psychological health of people, the requirement on the health care performance of the seat is also higher and higher. In the prior art, office and leisure chairs are generally adjusted to include a sitting position, an extending position and a lying position. Wherein the sitting position is a standard stowed position with the seat in its most original position for normal use by a person sitting in daily life, with the seat portion in a generally horizontal orientation and the backrest arranged to be substantially upright; in the extended position, the legs are extended forward of the seat while the back is held upright enough, or the back is extended rearward to allow the user to relax in office space. And a lying position in which the legs extend forwardly of the seat portion and the backrest is positioned rearwardly from the extended position at an obtuse angle to the seat portion for resting or sleeping.

However, the chair in the prior art is limited by the structure of the stretching posture, when the stretching posture is adjusted to the lying posture, the legs are far lower than the backrest, when the user is in the lying posture, the user still has a feeling that the gravity center slides downwards, and the seat with the gravity center lying at the back position for a long time can cause pain of the waist and the back.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an adjustable seat support further carries out the regulation of corresponding height and angle to the seat through gravity adjusting device when the appearance of lying for final human shank position is higher than the heart or is in the same level with the heart, reaches the purpose that improves blood circulation, alleviates the back and waist pain and alleviate fatigue. The technical problems that an ordinary office leisure chair in the prior art is single in function and poor in comfort in lying posture are solved.

The technical effects of the utility model are through following realization:

the utility model provides an adjustable seat support, which comprises a backrest support, a seat support and a leg support which are connected in sequence, wherein the seat support comprises a seat frame, a seat linkage frame, a seat connecting rod assembly, a fixed seat and a gravity adjusting device;

one end of the seat frame is connected with the backrest support, the other end of the seat frame is connected with the leg support, one end of the seat frame linkage frame is used for being connected with the leg support, the other end of the seat frame linkage frame is rotatably connected with the seat frame through a seat frame connecting rod assembly, one end of the fixed seat is rotatably connected with the seat frame linkage frame, and the other end of the fixed seat is used for being connected with the seat base;

gravity adjusting device includes gravity driving piece and drive connecting piece, gravity driving piece one end with the fixing base is connected, the other end with drive connecting piece connects, drive connecting piece with seat support interlock frame is connected, the gravity driving piece is used for the drive seat support interlock frame and seat frame for the fixing base rotates, when the seat support is adjusted from the appearance of lying to zero gravity appearance, gravity adjusting device will the seat support is adjusted to the terrain clearance of shank support peak and is greater than the terrain clearance of back support peak.

Furthermore, the chair seat linkage frame is a U-shaped frame, two connecting parts are symmetrically arranged at the opening end of the U-shaped frame, and each connecting part is used for being connected with the chair seat connecting rod assembly; one end of the seat connecting rod assembly is rotatably connected with the connecting part, and the other end of the seat connecting rod assembly is rotatably connected with the rear frame of the seat frame.

Further, the fixing base includes that fixed part and symmetry set up two connection curb plates of fixed part both sides, the fixing base through connect the curb plate with connecting portion rotate and connect, the fixed part is used for being connected with the seat base.

Furthermore, the gravity driving part comprises a first motor and a first push rod, the first motor is used for driving the first push rod, the first motor is hinged to the fixed seat, the first push rod is connected with the driving connecting part, and the driving connecting part is connected with the front frame of the seat linkage frame.

Furthermore, the seat frame is provided with a mounting connecting rod, one end of the mounting connecting rod is connected with the front edge frame of the seat frame, and the other end of the mounting connecting rod is connected with the rear edge frame of the seat frame.

Further, the seat support further comprises a back adjusting device, the back adjusting device is used for connecting and adjusting the backrest support, the back adjusting device comprises a second motor and a second push rod, the second motor is rotatably connected with the mounting connecting rod of the seat frame, and the second push rod is rotatably connected with the backrest support.

Further, the seat support further comprises a leg adjusting device, the leg adjusting device is used for connecting and adjusting the leg support, the leg adjusting device comprises a third motor and a third push rod, the third motor is rotatably connected with the front frame of the seat linkage frame through a mounting piece, and the third push rod is connected with one end, close to the rear frame of the seat frame, of the mounting connecting rod.

Furthermore, one end of the chair seat linkage frame, which is far away from the backrest support, is also provided with a support frame, two sides of the support frame are respectively fixed on two side edges of the chair seat linkage frame, and the support frame is used for fixing the driving connecting piece.

Further, the seat support can be adjusted to the position of sitting, extends the appearance, the appearance of lying and zero gravity appearance, the seat support is adjusted from the position of sitting to it is first regulation stage to extend the appearance, follows extend the appearance and adjust to the appearance of lying and be the second regulation stage, follows the appearance of lying is adjusted to zero gravity appearance and is the third regulation stage, the seat support interlock frame is in the maximum angle variation of third regulation stage is not less than 10, this moment the difference in height of shank support peak with back support peak is 100 and supplyes 260 mm.

Further, the seat support further comprises two leg connecting rod sets which are symmetrically arranged, each leg connecting rod set comprises at least three connecting rods, and two ends of each connecting rod are respectively connected with the seat linkage frame and the leg support in a rotating mode.

As described above, the utility model discloses following beneficial effect has:

(1) the utility model discloses a gravity adjusting device makes the seat support further adjust corresponding part's angle and height under the appearance state of lying that the shank back extends, makes the seat support can reach zero gravity posture, and is provided with the fixing base, when adjusting for zero gravity appearance, the seat support interlock frame and the seat frame of seat support rotate upwards around the tie point of seat support link assembly and fixing base, have guaranteed the stability of seat support.

(2) The utility model discloses zero gravity appearance makes human shank position be higher than the heart or be in the same level with the heart, and blood circulation pressure drops to the minimum, and body pressure greatly alleviates intervertebral disc pressure and back muscle tone nature under standing and the ordinary position of sitting condition at the buttock, reaches the purpose of improving blood circulation, alleviating the back pain, relaxing body and mind.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a seat support according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a gravity adjusting device according to an embodiment of the present invention;

FIG. 3 is a schematic view of a connection structure between a fixing base and a supporting frame according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a fixing base according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a seat link assembly according to an embodiment of the present invention;

fig. 6 is a schematic structural view of the back adjusting device and the leg adjusting device of the present invention;

fig. 7 is a schematic structural diagram of the position of the armrest support of the seat support of the present invention;

FIG. 8 is a schematic structural view of the seat support of the present invention in a normal lying position;

fig. 9 is a schematic structural view of the seat support of the present invention in a zero gravity position.

Wherein the reference numerals in the figures correspond to: 1-backrest support, 2-seat support, 3-leg support, 21-seat frame, 22-seat linkage support, 221-connecting part, 23-gravity adjusting device, 24-seat connecting rod component, 241-first connecting rod, 242-second connecting rod, 243-fixed connecting part, 4-fixed seat, 41-fixed part, 42-connecting side plate, 230-gravity driving part, 231-first motor, 232-first push rod, 233-driving connecting part, 211-mounting connecting rod, 5-back adjusting device, 51-second motor, 52-second push rod, 6-leg adjusting device, 61-third motor, 62-third push rod, 63-mounting part, 7-support frame, 8-leg connecting rod group, 81-third connecting rod, 82-fourth connecting rod, 83-fifth connecting rod, 9-seat base and 10-armrest support.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

The seat support can be adjusted to position of sitting, extend the appearance, the appearance of lying and zero gravity appearance, the seat support is adjusted extremely from the position of sitting stretch the appearance of stretching is first regulation stage, follows it adjusts to the appearance of lying and is the second regulation stage, follows it adjusts to zero gravity appearance to be the third regulation stage.

Example 1:

as shown in fig. 1-3, an adjustable seat support according to an embodiment of the present invention includes a backrest support 1, a seat support 2, and a leg support 3, which are connected in sequence, where the seat support 2 includes a seat frame 21, a seat linkage frame 22, a seat link assembly 24, a fixed seat 4, and a gravity adjusting device 23;

one end of the seat frame 21 is connected with the backrest support 1, and the other end is connected with the leg support 3. In the embodiment of the present invention, the side of the seat frame 21 connected to the backrest support 1 is a rear frame, and the end of the seat frame 21 connected to the leg support 3 is a front frame. One end of the seat linkage frame 22 is used for being connected with the leg support 3, the other end of the seat linkage frame is rotatably connected with the seat frame 21 through a seat connecting rod assembly 24, one end of the fixed seat 4 is rotatably connected with the seat linkage frame 22, and the other end of the fixed seat is used for being connected with the seat base 9;

the gravity adjusting device 23 comprises a gravity driving member 230 and a driving connecting member 233, wherein one end of the gravity driving member 230 is connected with the fixed seat 4, and the other end of the gravity driving member is connected with the driving connecting member 233. Preferably, the gravity driving member 230 is hinged with the fixed seat 4. The driving connecting piece 233 is connected to the seat linking frame 22, the gravity driving piece 230 is used to drive the seat linking frame 22 and the seat frame 21 to rotate relative to the fixing seat 4, and when the seat support is adjusted from the lying posture to the zero gravity posture, the gravity adjusting device 23 adjusts the seat support to a height above the ground at the highest point of the leg support 3 which is greater than the height above the ground at the highest point of the backrest support 1. Preferably, in this embodiment, the height difference between the highest point of the leg support 3 and the highest point of the backrest support 1 is 100-260mm, and preferably, the leg support 3 is 100mm, 180mm, 200mm, 252mm or 260mm higher than the backrest support, in this embodiment, the ground clearance of the leg support is 652mm, and the ground clearance of the backrest support is 400 mm. Too high a leg can also cause too low a head in a zero gravity position affecting comfort and seat stability.

Preferably, in the embodiment of the present invention, the seat linkage frame 22 is a U-shaped frame, two connecting portions 221 are symmetrically disposed at an opening end of the U-shaped frame, and each of the connecting portions 221 is configured to be connected to the seat link assembly 24. Preferably, in some embodiments, the connection portion 221 may be a connection member such as a connection plate, a connection sheet, or a connection rod, and a support member may be disposed between the two connection portions 221 for stable connection. One end of the seat connecting rod assembly 24 is rotatably connected with the connecting part 221, and the other end of the seat connecting rod assembly 24 is rotatably connected with the rear frame of the seat frame 21. In some embodiments, as shown in fig. 5, the seat link assembly 24 includes a first link 241 and a second link 242, and the first link 241 and the second link 242 have one end rotatably connected to the connecting portion 221 and the other end rotatably connected to the rear frame of the seat frame 21 by a fixed connecting member 243.

Specifically, as shown in fig. 4, the fixing base 4 includes a fixing portion 41 and two connecting side plates 42 symmetrically disposed at two sides of the fixing portion 41, the fixing base 4 is rotatably connected to the connecting portion 221 of the seat linking frame 22 through the connecting side plates 42, and the fixing portion 41 is configured to be connected to the seat base 9. Preferably, the two connecting side plates 42 are symmetrically arranged at the outer sides of the two connecting portions 221 and are rotatably connected by a rotating shaft or other rotating connection member. The fixing portion 41 is provided with an attachment hole to be connected to a support rod of the seat base 9.

Specifically, as shown in fig. 2, the gravity driving member 230 includes a first motor 231 and a first push rod 232, the first motor 231 is used for driving the first push rod 232, the first motor 231 is hinged to the fixing base 4, the first push rod 232 is connected to the driving connection member 233, and the driving connection member 233 is connected to the front frame of the seat linking frame 22. Specifically, when the chair support is adjusted from the lying posture to the zero gravity posture, the first motor 231 drives the first push rod 232 to move forward linearly, and the first push rod 232 pushes the front frame of the chair seat linkage frame 22 through the driving connecting member 233, so that the connecting point of the chair seat linkage frame 22 and the fixed seat 4 is rotated upward as a circle center.

Specifically, as shown in fig. 6, a mounting link 211 is disposed on the seat frame 21, one end of the mounting link 211 is connected to the front frame of the seat frame 21, and the other end of the mounting link 211 is connected to the rear frame of the seat frame 21.

Specifically, the seat support further comprises a back adjusting device 5, the back adjusting device 5 is used for connecting and adjusting the backrest support 1, the back adjusting device 5 comprises a second motor 51 and a second push rod 52, the second motor 51 is rotatably connected with the mounting link 211 of the seat frame 21, and the second push rod 52 is rotatably connected with the backrest support 1.

Specifically, when the seat support is adjusted to a zero gravity posture, the angle between the backrest support 1 and the seat frame 21 is 110-130 degrees, the angle between the backrest support 1 and the ground is 20-30 degrees, and the angle between the leg support and the ground is 20-25 degrees. In some embodiments, the angle between the backrest support 1 and the seat frame 21 may be 110 °, 118 °, 120 °, 125 °, 130 °, or the like, the angle between the backrest support 1 and the ground may be 20 °, 25 °, 26 °, 28 °, or 30 °, and the angle between the leg support and the ground may be 20 °, 23 °, or 25 °. Preferably, in the embodiment of the present invention, when the seat support is adjusted to the zero gravity position, the angle between the backrest support 1 and the seat frame 21 is 120 °, the angle between the backrest support 1 and the ground is 26 °, and the angle between the leg support and the ground is 23 °.

Specifically, the seat support further comprises a leg adjusting device 6, the leg adjusting device 6 is used for connecting and adjusting the leg support 3, the leg adjusting device 6 comprises a third motor 61 and a third push rod 62, the third motor 61 is rotatably connected with the front frame of the seat linking frame 22 through a mounting part 63, and the third push rod 62 is connected with one end of the mounting connecting rod 211 close to the rear frame of the seat frame 21.

Specifically, one end of the seat linkage frame 22, which is far away from the backrest support 1, is further provided with a support frame 7, two sides of the support frame 7 are respectively fixed on two side edges of the seat linkage frame 22, and the support frame is used for fixing the driving connecting piece 233. Specifically, the driving connecting member 233 is obliquely disposed on the supporting frame 7 and the seat linking frame 22.

The maximum angle variation of the seat linkage frame 22 in the third adjustment stage is not less than 10 °. Preferably, in some embodiments, the angle of the gravity driving device driving the seat linkage frame 22 and the seat frame 21 to rotate upward may be 10 °, 15 °, 18 ° or the like, and preferably, the angle of the upward rotation of the seat linkage frame 22 in the third adjustment stage is 15 °.

Specifically, as shown in fig. 5, the seat support further includes two leg link sets 8 symmetrically disposed, each leg link set 8 includes at least three connecting rods, and two ends of each of the at least three connecting rods are respectively rotatably connected to the seat linkage frame 22 and the leg support 3. In the embodiment of the present invention, the leg linkage 8 includes a third connecting rod 81, a fourth connecting rod 82 and a fifth connecting rod 83, the third connecting rod 81 is connected to the seat linkage frame 22, one end of the fourth connecting rod 82 is connected to the third connecting rod 81, the other end is connected to the leg support 3 and the seat frame 21, one end of the fifth connecting rod 83 is connected to the third connecting rod 81, the other end is connected to the leg support 3, and the leg linkage 8 is used for unfolding and retracting the leg support 3.

As shown in fig. 7, the seat support of the present invention further includes a handle support 10, the handle support 10 is fixed at two ends of the seat frame 21, and further includes an electric control switch, the electric control switch is fixed at one side of the support frame 7, the electric control switch is electrically connected with the gravity adjusting device 23, the back adjusting device 5 and the leg adjusting device 6, and the seat support can be controlled by the electric control switch to realize various postures.

The utility model can adjust the seat support, the normal sitting posture is the initial posture, the backrest support of the seat support can be controlled to be unfolded in the first adjusting stage, and the back part is extended backwards to the extending posture; as shown in fig. 8, the second adjusting stage can control the leg support of the seat support to be unfolded to realize a lying posture state that the legs and the back are unfolded; as shown in fig. 9, the third adjustment stage can further control the seat support to rotate upward to achieve a zero gravity position in which the height of the leg support above the ground is greater than the height of the back support above the ground. The multiple postures can be independently controlled to maintain one posture, and can also be linked to control and convert different postures, for example, the lying posture can be independently controlled and adjusted to be a zero-gravity posture through the lying posture, and the lying posture can also be directly adjusted to be the zero-gravity posture.

The utility model discloses a gravity adjusting device makes the seat support further adjust corresponding part's angle and height under the appearance state of lying that the shank back extends, makes the seat support can reach zero gravity posture, and is provided with the fixing base, when adjusting for zero gravity appearance, the seat support interlock frame and the seat frame of seat support rotate upwards around the tie point of seat support link assembly and fixing base, have guaranteed the stability of seat support. The utility model discloses zero gravity appearance makes human shank position be higher than the heart or be in the same level with the heart, and blood circulation pressure drops to the minimum, and body pressure greatly alleviates intervertebral disc pressure and back muscle tone nature under standing and the ordinary position of sitting condition at the buttock, reaches the purpose of improving blood circulation, alleviating the back pain, relaxing body and mind.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. An adjustable seat support is characterized by comprising a backrest support (1), a seat support (2) and a leg support (3) which are sequentially connected, wherein the seat support (2) comprises a seat frame (21), a seat linkage frame (22), a seat connecting rod assembly (24), a fixed seat (4) and a gravity adjusting device (23);

one end of the seat frame (21) is connected with the backrest support (1), the other end of the seat frame is connected with the leg support (3), one end of the seat frame linkage frame (22) is used for being connected with the leg support (3), the other end of the seat frame linkage frame is rotatably connected with the seat frame (21) through a seat frame connecting rod assembly (24), one end of the fixed seat (4) is rotatably connected with the seat frame linkage frame (22), and the other end of the fixed seat is used for being connected with the seat base (9);

gravity adjusting device (23) include gravity driving piece (230) and drive connection spare (233), gravity driving piece (230) one end with fixing base (4) are connected, the other end with drive connection spare (233) are connected, drive connection spare (233) with seat support interlock frame (22) are connected, gravity driving piece (230) are used for the drive seat support interlock frame (22) and seat frame (21) for fixing base (4) rotate, when the seat support adjusts to zero gravity appearance from lying the appearance, gravity adjusting device (23) will the height from ground of seat support regulation to shank support (3) peak is greater than the height from ground of back support (1) peak.

2. The adjustable seat support according to claim 1, wherein the seat linkage frame (22) is a U-shaped frame, two connecting portions (221) are symmetrically arranged at the open end of the U-shaped frame, and each connecting portion (221) is used for connecting with the seat connecting rod assembly (24); one end of the seat connecting rod assembly (24) is rotatably connected with the connecting part (221), and the other end of the seat connecting rod assembly (24) is rotatably connected with the rear frame of the seat frame (21).

3. An adjustable seat support according to claim 2, wherein the fixed seat (4) comprises a fixed portion (41) and two connecting side plates (42) symmetrically arranged at two sides of the fixed portion (41), the fixed seat (4) is rotatably connected with the connecting portion (221) through the connecting side plates (42), and the fixed portion (41) is used for being connected with the seat base (9).

4. The adjustable seat support of claim 1, wherein the gravity driving member (230) comprises a first motor (231) and a first push rod (232), the first motor (231) is used for driving the first push rod (232), the first motor (231) is hinged to the fixed seat (4), the first push rod (232) is connected to the driving connecting member (233), and the driving connecting member (233) is connected to the front frame of the seat linking frame (22).

5. The adjustable seat support according to claim 1, wherein the seat frame (21) is provided with a mounting link (211), one end of the mounting link (211) is connected with the front frame of the seat frame (21), and the other end of the mounting link (211) is connected with the rear frame of the seat frame (21).

6. An adjustable seat support according to claim 1, further comprising a back adjustment device (5), wherein the back adjustment device (5) is used for connecting and adjusting the backrest support (1), the back adjustment device (5) comprises a second motor (51) and a second push rod (52), the second motor (51) is rotatably connected with the mounting link (211) of the seat frame (21), and the second push rod (52) is rotatably connected with the backrest support (1).

7. The adjustable seat support according to claim 1, further comprising a leg adjusting device (6), wherein the leg adjusting device (6) is used for connecting and adjusting the leg support (3), the leg adjusting device (6) comprises a third motor (61) and a third push rod (62), the third motor (61) is rotatably connected with the front frame of the seat linking frame (22) through a mounting part (63), and the third push rod (62) is connected with one end of the mounting connecting rod (211) close to the rear frame of the seat frame (21).

8. The adjustable seat support of claim 1, wherein a support frame (7) is further disposed at an end of the seat linkage frame (22) away from the backrest support (1), two sides of the support frame (7) are respectively fixed at two sides of the seat linkage frame (22), and the support frame is used for fixing the driving connecting member (233).

9. The adjustable seat support according to claim 1, wherein the seat support can be adjusted to a sitting posture, an extending posture, a lying posture and a zero gravity posture, the adjustment of the seat support from the sitting posture to the extending posture is a first adjustment stage, the adjustment from the extending posture to the lying posture is a second adjustment stage, the adjustment from the lying posture to the zero gravity posture is a third adjustment stage, the maximum angle variation of the seat linkage frame (22) in the third adjustment stage is not less than 10 °, and the height difference between the highest point of the leg support (3) and the highest point of the backrest support (1) is 260mm and 100 degrees.

10. The adjustable seat support according to claim 1, further comprising two leg linkages (8) symmetrically disposed, each leg linkage (8) comprising at least three links, wherein two ends of at least three links are respectively connected to the seat linkage frame (22) and the leg support (3) in a rotatable manner.