CN220655167U - Linkage type lifting chair - Google Patents

Abstract

The utility model relates to the technical field of furniture articles, and provides a linkage lifting chair which comprises a base, a backrest, a base body and a lifting mechanism. The backrest has a first stowed position and a second raised position; the base is provided with a first installation cavity with an opening at one side, the base is arranged at the opening, and the base is movably arranged on the base; the part elevating system locates first installation cavity, and elevating system includes first rack and pinion group and second rack and pinion group, and the transmission is connected between first rack and pinion group and the second rack and pinion group, and first rack and pinion group is connected with the pedestal for action pedestal removes, and second rack and pinion group is connected with the back for action back goes up and down in first storage position and second raising position. The backrest can realize automatic lifting and state switching of the seat body and the backrest through the dead weight of a human body, the adjusting mode is simple, and the accommodating state can be better taken in the space below the desk, so that the space utilization rate is improved.

Description

Linkage type lifting chair

Technical Field

The utility model relates to the technical field of furniture articles, in particular to a linkage lifting chair.

Background

The lifting chair is a swivel chair with a height-adjustable seat surface and a horizontally rotatable seat surface, and people commonly call the chair by the names of a swivel lifting chair, a swivel chair, a computer chair, an office chair and the like. The seat surface can be lifted up and down because the lifting device for adjusting the height is arranged below the seat surface of the seat. According to whether the lifting device is pneumatic or hydraulic, the lifting chairs in the prior art are divided into an air pressure lifting chair and a hydraulic lifting chair. Because the hydraulic lifting chair is expensive in cost, relatively complex in structure, and not sensitive enough in height adjustment, the hydraulic lifting chair has a low market share in China. The pneumatic lifting chair has the characteristics of low cost, simple structure, flexible operation and the like, and is popular with consumers. It is estimated that more than 80% of office buildings and companies are using air pressure lift chairs.

However, most of existing lifting chairs can only adjust the height of the chair through the integral lifting of the seat body and the backrest, and the chair backrest is relatively high, so that the lifting chair cannot be integrally accommodated in the lower space of the table, occupies a large space position, is inconvenient to accommodate, and reduces the space utilization rate.

Disclosure of Invention

The utility model provides a linkage type lifting chair, which is used for solving the technical defects that the height of a backrest of the lifting chair cannot be adjusted and the backrest is inconvenient to store in the prior art, realizing the automatic lifting and state switching of a seat body and the backrest by the dead weight of a human body, having simple adjustment mode and better storing state into the lower space of a table so as to realize visual hiding of the lifting chair and improve the space utilization rate.

The utility model provides a linkage type lifting chair, which comprises:

a base;

the backrest is movably arranged on one side of the base, and has a first storage position and a second lifting position on the moving track of the backrest, wherein the backrest is enclosed on one side of the base when the backrest is positioned at the first storage position; when the backrest is in the second raised position, the backrest is away from the base;

the base is provided with a first mounting cavity with an opening at one side, the base is arranged at the opening, and the base is movably arranged on the base;

the lifting mechanism is arranged in the first mounting cavity, the lifting mechanism comprises a first gear rack group and a second gear rack group, the first gear rack group is in transmission connection with the second gear rack group, the first gear rack group is connected with the seat body and used for acting the seat body to move, and the second gear rack group is connected with the backrest and used for acting the backrest to lift at the first storage position and the second lifting position.

According to the linkage lifting chair provided by the utility model, the first gear and rack set is arranged in the first mounting cavity, the first gear and rack set comprises the first gear and the first rack, one end of the first rack is connected to the inner wall surface of the top end of the seat body, the other end of the first rack extends towards the direction of the base, the first gear is rotatably arranged on the base, the first gear and the first rack are meshed for transmission, and the first gear and the second gear and rack set are coaxially and cooperatively arranged.

According to the linkage lifting chair provided by the utility model, the backrest is provided with the second mounting cavity, the second gear rack group comprises the second gear and the second rack, the second rack is arranged in the second mounting cavity, one end of the second rack is connected with the backrest, the other end of the second rack extends towards the direction of the base, the second gear is rotatably arranged on the base, the second gear and the second rack are meshed for transmission, and the first gear and the second gear are coaxially and cooperatively arranged.

According to the linkage type lifting chair provided by the utility model, the lifting mechanism further comprises a rotating shaft, the rotating shaft is arranged in the first mounting cavity, and the first gear and the second gear are fixedly arranged on the rotating shaft in a penetrating mode.

According to the linkage type lifting chair provided by the utility model, the linkage type lifting chair further comprises a supporting seat, wherein the supporting seat is arranged on the base, and the rotating shaft is rotatably connected to the supporting seat.

According to the linkage lifting chair provided by the utility model, the supporting seat is provided with the first supporting rod and the second supporting rod which are arranged at intervals, the rotating shaft is rotatably connected to one ends of the first supporting rod and the second supporting rod, which are far away from the base, and the first gear and the second gear are arranged between the first supporting rod and the second supporting rod.

According to the linkage lifting chair provided by the utility model, the outer peripheral wall of the seat body facing the backrest is provided with the first connecting port, the opposite position of one side of the backrest facing the base to the first connecting port is provided with the second connecting port, part of the second gears extend out of the first mounting cavity from the first connecting port, and extend into the second mounting cavity from the second connecting port to be in meshed connection with the second racks.

According to the linkage lifting chair provided by the utility model, the number of teeth of the second gear is greater than or equal to that of the first gear.

According to the linkage lifting chair provided by the utility model, the first gear rack group comprises two first gears and two first racks, the two first gears are sleeved on the rotating shaft at intervals, the second gear is clamped between the two first gears, and the two first racks are arranged on the inner wall surface of the top end of the seat body corresponding to the first gears.

According to the linkage lifting chair provided by the utility model, the end, close to the base, of the supporting seat is provided with the limiting part, the limiting part extends towards the top end direction of the seat body, and the limiting part is matched with the opening to limit the circumferential direction of the seat body.

According to the lifting chair, linkage between the first gear rack group and the second gear rack group in the lifting mechanism is adopted to achieve lifting of the backrest between the first storage position and the second lifting position under action of the seat body, when a user sits down on the seat body, the seat body moves downwards, so that the first gear rack group is driven to carry out meshing transmission, the first gear rack is coaxially linked with the second gear rack, the second gear rack group is synchronously meshed with the first gear rack to drive, so that the backrest is moved at the first storage position and the second lifting position in a moving mode, the backrest can be used for providing dependence for the user at the second lifting position, and when the backrest is located at the first storage position, the backrest descends and is retracted to be approximately equal in height with the seat body, so that the overall height of the lifting chair is reduced, the visual hiding of the lifting chair is achieved, and the space utilization rate of the lifting chair is improved.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a linkage lift chair according to an embodiment of the present utility model;

FIG. 2 is a partial cross-sectional view of the ganged lift chair of the present utility model in a stowed condition;

FIG. 3 is a partial cross-sectional view of the ganged lift chair of the present utility model in an extended position;

fig. 4 is an application scene diagram of a storage state of the linkage type lifting chair provided by the utility model;

fig. 5 is an application scene diagram of the unfolding state of the linkage type lifting chair.

Reference numerals:

100. linkage type lifting chair;

110. a base;

120. a backrest; 121. a second mounting cavity; 122. a second connection port;

130. a base; 131. a first mounting cavity; 132. an opening; 133. a first connection port;

140. a lifting mechanism; 141. a first rack and pinion set; 141a, a first gear; 141b, a first rack; 142. a second rack and pinion set; 142a, a second gear; 142b, a second rack; 143. a rotating shaft;

150. a support base; 151. a first support bar; 152. a second support bar; 153. a limit part;

200. a table.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.

The utility model provides a linkage type lifting chair.

In an embodiment of the present utility model, as shown in fig. 1 to 3, a linkage type elevating chair 100 includes a base 110, a backrest 120, a base 130, and an elevating mechanism 140. The base 110 is used for supporting the installation of other components; the backrest 120 is movably mounted on one side of the base 110, and the backrest 120 has a first storage position and a second lifting position on a moving track of the backrest 120, wherein the backrest 120 is enclosed on one side of the base 110 when the backrest 120 is positioned at the first storage position; when the backrest 120 is in the second raised position, the backrest 120 is away from the base 110; the base 130 has a first installation cavity 131 with an opening 132 at one side, the base 110 is arranged at the opening 132, and the base 130 is movably arranged on the base 110; the lifting mechanism 140 is disposed in the first mounting cavity 131, the lifting mechanism 140 includes a first rack and pinion set 141 and a second rack and pinion set 142, the first rack and pinion set 141 and the second rack and pinion set 142 are in transmission connection, the first rack and pinion set 141 is connected with the seat 130 for moving the seat 130, and the second rack and pinion set 142 is connected with the backrest 120 for moving the backrest 120 to lift in the first storage position and the second lifting position.

Specifically, in the embodiment of the present utility model, referring to fig. 4 and 5, the linkage type lifting chair 100 may be applied to a meeting room or a dining table, and the like, specifically, a plurality of linkage type lifting chairs 100 may be arranged at intervals on both sides of the table 200, the periphery of the table 200 may be lifted out when needed, the backrest 120 may be automatically lifted up after sitting down, the backrest 120 may be automatically lowered after leaving the linkage type lifting chair 100, in a storage state, and then pushed under the table 200 to complete storage thereof, so as to save a part of space of the meeting room or the living room, and the like, and maximize space utilization.

In the embodiment of the present utility model, the linkage type lifting chair 100 includes a base 110, a base 130, a backrest 120 and a lifting mechanism 140, the base 110 is generally in a plate shape, the base 110 has an upper end face and a lower end face opposite to each other, the lower end face is used for being supported against the ground, the base 130 is generally in a cylinder shape, one end of the base 130 has an opening 132, the base 130 is covered on the base 110, the outer wall surface of the top end of the base 130 is provided with a sitting position for providing a user with sitting, the base 130 and the base 110 are enclosed to form a first mounting cavity 131, the first mounting cavity 131 is used for mounting at least part of the lifting mechanism 140, the backrest 120 is generally in a wedge shape, although other embodiments may be in a plate shape or a curve shape, etc., without being limited thereto. The backrest 120 is movably disposed at one side of the seat 130, and the lifting mechanism 140 is connected between the backrest 120, the seat 130 and the base 110 for controlling the lifting of the backrest 120 according to the movement of the seat 130. Specifically, the backrest 120 has a first storage position and a second lifting position on a moving path, the seat 130 has a third storage position and a fourth lifting position, when the user sits on the seat, a downward force is applied to the seat 130 due to the gravity of the user, so that the seat 130 moves downwards from the third storage position to the fourth lifting position, and the first rack and pinion set 141 is moved during the lifting of the seat 130, so as to drive the second rack and pinion set 142 in driving connection with the first rack and pinion set 141, and the second rack and pinion 142a moves the backrest 120 from the first storage position to the second storage position. Thus, the backrest 120 is automatically lifted, and after the user leaves the sitting position, i.e. removes the downward force applied to the seat 130, the backrest 120 descends from the second lifted position to the first storage position under the action of self gravity, and the second rack and pinion set 142 acts against the first rack and pinion set 141 during the movement, so that the seat 130 ascends from the fourth lowered position to the third storage position, thereby completing the automatic storage of the lifting chair. Thus, to realize the self-circulation of backrest 120 and pedestal 130 lift adjustment, the regulation mode is simple, and elevating system 140 wholly set up in first installation cavity 131 be difficult for interfering with other parts, when improving the stability of lift operation, improve the whole outward appearance aesthetic measure of coordinated type lift chair 100.

According to the lifting mechanism, linkage between the first gear 141a rack set 141 and the second gear 142a rack set 142 in the lifting mechanism 140 is adopted to realize lifting of the backrest 120 between the first storage position and the second lifting position under the action of the seat body 130, when a user sits down on the seat body 130, the seat body 130 moves downwards, so that the first gear 141a rack set 141 is driven to carry out meshing transmission, the first gear 141a rack is coaxially linked with the second gear 142a rack, the second gear 142a rack set 142 also carries out meshing transmission with the first gear 141a rack synchronously, so that the backrest 120 is moved between the first storage position and the second lifting position, and the backrest 120 can be used for providing a depending on the user in the second lifting position.

Referring to fig. 2 and 3, in some embodiments, a first rack and pinion set 141 is disposed in the first mounting cavity 131, the first rack and pinion set 141 includes a first gear 141a and a first rack and pinion 141b, one end of the first rack and pinion 141b is connected to an inner wall surface of a top end of the base 130, the other end of the first rack and pinion 141b extends toward the base 110, the first gear and pinion 141a is rotatably disposed on the base 110, the first gear and pinion 141a and the first rack and pinion 141b are engaged and driven, and the first gear and pinion 141a and the second rack and pinion set 142 are coaxially and cooperatively disposed. It is to be understood that the first rack and pinion 141 includes a first gear 141a and a first rack 141b, the first rack 141b is connected to the base 130, the first rack 141b and the first gear 141a are in meshed transmission, the first gear 141a is coaxially connected to the second rack and pinion 142, so as to drive the first rack 141b to move in the moving process of the base 130, and the first rack 141b and the first rack 141a are in meshed transmission to drive the second rack and pinion 142a to move, so as to further move the backrest 120 to lift between the first storage position and the second lifting position, where the first rack and pinion 141a and the second rack and pinion 142 share the same axis, and linkage is realized through the connection of the axes. So as to ensure that the movement of the seat 130 is synchronized with the movement of the backrest 120.

Referring to fig. 2 and 3, in some embodiments, the backrest 120 has a second mounting cavity 121, the second rack and pinion set 142 includes a second gear 142a and a second rack 142b, the second rack 142b is disposed in the second mounting cavity 121, one end of the second rack 142b is connected with the backrest 120, the other end of the second rack 142b extends toward the direction of the base 110, the second gear 142a is rotatably disposed on the base 110, the second gear 142a and the second rack 142b are engaged and driven, and the first gear 141a and the second gear 142a are coaxially and cooperatively disposed. It can be understood that in the present embodiment, the backrest 120 is disposed in a substantially wedge-shaped cavity structure, the second mounting cavity 121 is disposed in the backrest 120, the second rack 142b is disposed in the second mounting cavity 121 along the moving direction of the backrest 120, the second gear 142a is coaxially linked with the first gear 141a, when the first rack 141b is meshed with the first gear 141a to rotate, the first gear 141a drives the second gear 142a to synchronously rotate, and the second rack 142b meshed with the second gear 142a moves along a predetermined direction, so as to drive the backrest 120 connected with the second rack 142 to lift between the first storage position and the second lifting position, the lifting movement of the backrest 120 is realized by the second rack and pinion 142, and the coordination movement of the seat and the backrest 120 is realized by the coaxial linkage of the first gear 141a and the second gear 142 a.

Referring to fig. 3, in some embodiments, the lifting mechanism 140 further includes a rotating shaft 143, the rotating shaft 143 is disposed in the first mounting cavity 131, and the first gear 141a and the second gear 142a are fixedly disposed through the rotating shaft 143. It can be understood that, in the present application, the rotating shaft 143 is rotatably disposed in the first mounting cavity 131, and the first gear 141a and the second gear 142a are both disposed on the rotating shaft 143 and fixedly connected with the rotating shaft 143, so that when the first gear 141b moves to rotate with the first gear 141a, the second gear 142a is synchronously driven to rotate, or when the second gear 142b moves to rotate with the second gear 142a, the first gear 141a also synchronously rotates, so as to drive the first gear 141b to move, thereby realizing the linkage lifting effect of the backrest 120 of the seat 130.

Referring to fig. 2 and 3, in some embodiments, the linkage lift chair 100 further includes a support base 150, the support base 150 is disposed on the base 110, and the rotating shaft 143 is rotatably connected to the support base 150. Specifically, the support base 150 has a first support rod 151 and a second support rod 152 disposed at intervals, the rotation shaft 143 is rotatably connected to one ends of the first support rod 151 and the second support rod away from the base 110, and the first gear 141a and the second gear 142a are disposed between the first support rod 151 and the second support rod 152. It can be appreciated that in order to realize the rotation support of the rotating shaft 143 by providing the first support rod 151 and the second support rod 152 on the support base 150, the rotating shaft 143 may be connected to the first support rod 151 and the second support rod 152 by means of bearings or the like, the first support rod 151 and the second support rod 152 are disposed on the support base 150 at intervals, and the first support rod 151 and the second support rod 152 extend toward the top end direction of the base 130. The first support rod 151 and the second support rod 152 are arranged at an included angle with the top end surface of the base 110, and the first support rod 151 and the second support rod 152 are arranged in parallel with the first rack 141b and the second rack 142b, so that the height setting of the seat body 130 can be reduced, the height control of the seat body 130 is facilitated, and the linkage type lifting chair 100 is convenient to store.

Referring to fig. 2, in some embodiments, a first connection port 133 is disposed on an outer peripheral wall of the seat body 130 facing the backrest 120, a second connection port 122 is disposed on a side of the backrest 120 facing the base 110 opposite to the first connection port, and a portion of the second gear 142a extends from the first connection port 133 out of the first mounting cavity 131, and extends from the second connection port 122 into the second mounting cavity 121 to be engaged with the second rack 142 b. It can be understood that the second gear 142a and the first gear 141a are coaxially disposed on the rotating shaft 143 and are located in the first mounting cavity 131, and the second rack 142b is disposed in the second mounting cavity 121 of the backrest 120, so that in order to achieve the meshing transmission between the second gear 142a and the second rack 142b, in this embodiment, the first connection port 133 and the second connection port 122 are disposed at positions opposite to the backrest 120 and the seat 130, so that the second gear 142a extends out of the first mounting cavity 131 to mesh with the second rack 142 b.

Referring to FIG. 3, in some embodiments, the number of teeth of the second gear 142a is greater than or equal to the number of teeth of the first gear 141 a. Thus, in order to achieve a higher gear ratio, by making the number of teeth of the second gear 142a greater than or equal to the number of teeth of the first gear 141a, the lifting speed and the lifting distance of the backrest 120 when the rotation shaft 143 rotates can be increased.

In some embodiments, the first rack-and-pinion set 141 includes two first gears 141a and two first racks 141b, the two first gears 141a are sleeved on the rotating shaft 143 at intervals, the second gear 142a is sandwiched between the two first gears 141a, and the two first racks 141b are disposed on an inner wall surface of the top end of the base 130 corresponding to the first gears 141 a. It can be appreciated that, in order to balance the driving force applied to the rotating shaft 143, the first rack and pinion set 141 in this embodiment may include two first gears 141a and two first racks 141b, where the two first gears 141a are spaced and symmetrically arranged at the middle of the rotating shaft 143, and the second gear 142a is sleeved between the rotating shaft 143 and the two first gears 141a, so as to improve the stability of the lifting mechanism 140 in the moving process, and the two first racks 141b are spaced and arranged on the inner wall surface of the top end of the base 130 corresponding to the two first gears 141a to cooperate with the first gears 141a to act on the rotating shaft 143 to rotate, thereby improving the motion stability of the lifting mechanism 140 and ensuring the stability of the linked lifting chair 100 in the using process.

Referring to fig. 2 and 3, in some embodiments, a limiting portion 153 is disposed at an end of the support base 150 near the base 110, the limiting portion 153 extends toward the top end of the base 130, and the limiting portion 153 cooperates with the opening 132 to limit the circumference of the base 130. It can be appreciated that the limiting portion 153 extends toward the top end of the base 130 and cooperates with the opening 132 of the base 130 to limit the base 130 circumferentially, thereby limiting the movement of the base 130 in the circumferential direction. The seat 130 is prevented from tilting or shaking in an unnecessary direction. Meanwhile, the design of the limiting part 153 can simplify the structure of the chair and improve the manufacturing efficiency.

In embodiments of the utility model, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A ganged-lift chair, comprising:

a base;

the backrest is movably arranged on one side of the base, and has a first storage position and a second lifting position on the moving track of the backrest, wherein the backrest is enclosed on one side of the base when the backrest is positioned at the first storage position; when the backrest is in the second raised position, the backrest is away from the base;

the base is provided with a first mounting cavity with an opening at one side, the base is arranged at the opening, and the base is movably arranged on the base;

the lifting mechanism is arranged in the first mounting cavity, the lifting mechanism comprises a first gear rack group and a second gear rack group, the first gear rack group is in transmission connection with the second gear rack group, the first gear rack group is connected with the seat body and used for acting the seat body to move, and the second gear rack group is connected with the backrest and used for acting the backrest to lift at the first storage position and the second lifting position.

2. The linkage type lifting chair according to claim 1, wherein the first gear rack set is arranged in the first mounting cavity, the first gear rack set comprises a first gear and a first rack, one end of the first rack is connected to an inner wall surface at the top end of the base, the other end of the first rack extends towards the direction of the base, the first gear is rotatably arranged on the base, the first gear and the first rack are in meshed transmission, and the first gear and the second gear rack set are coaxially arranged in linkage.

3. The linkage type lifting chair according to claim 2, wherein the backrest is provided with a second mounting cavity, the second gear rack group comprises a second gear and a second rack, the second rack is arranged in the second mounting cavity, one end of the second rack is connected with the backrest, the other end of the second rack extends towards the direction of the base, the second gear is rotatably arranged on the base, the second gear and the second rack are in meshed transmission, and the first gear and the second gear are coaxially arranged in linkage.

4. A linked lift chair according to claim 3, wherein the lift mechanism further comprises a shaft disposed within the first mounting cavity, the first gear and the second gear being fixedly disposed through the shaft.

5. The linked lift chair of claim 4, further comprising a support base disposed on the base, the shaft rotatably coupled to the support base.

6. The linkage lift chair of claim 5, wherein the support base has a first support bar and a second support bar disposed in spaced relation, the shaft is rotatably coupled to the first support bar and the second support bar at an end thereof remote from the base, and the first gear and the second gear are disposed between the first support bar and the second support bar.

7. The linkage type lifting chair according to any one of claims 3 to 6, wherein a first connecting port is formed in the outer peripheral wall of the seat body facing the backrest, a second connecting port is formed in a position, opposite to the first connecting port, of one side of the backrest facing the base, and part of the second gear extends out of the first mounting cavity through the first connecting port, and extends into the second mounting cavity through the second connecting port to be in meshed connection with the second rack.

8. The linkage lift chair of any one of claims 3-6, wherein the second gear has a number of teeth greater than or equal to the number of teeth of the first gear.

9. The linkage type lifting chair according to any one of claims 4 to 6, wherein the first rack and pinion set includes two first gears and two first racks, the two first gears are sleeved on the rotating shaft at intervals, the second gear is sandwiched between the two first gears, and the two first racks are disposed on an inner wall surface of the top end of the base body corresponding to the first gears.

10. The linkage type lifting chair according to claim 5, wherein a limiting portion is arranged at one end, close to the base, of the supporting seat, the limiting portion extends towards the top end of the seat body, and the limiting portion is matched with the opening to limit the circumferential direction of the seat body.