Lifting seat

Abstract

The utility model discloses a lifting seat which comprises a seat cushion framework, a seat back framework, a leg support framework and lifting supporting legs, wherein the seat back framework and the leg support framework are respectively and rotatably connected with the seat cushion framework; the lifting supporting legs are arranged at the bottom end of the seat cushion framework; the lifting supporting leg comprises a lower supporting pipe, an upper supporting pipe partially arranged on the outer layer of the lower supporting pipe in a sleeving mode, a lead screw assembly used for driving the upper supporting pipe to do lifting motion relative to the lower supporting pipe, and an elastic piece used in cooperation with the lead screw assembly and suitable for deforming along with the lifting motion of the upper supporting pipe relative to the lower supporting pipe. A chair back adjusting driving assembly is arranged between the chair cushion framework and the chair back framework; and a leg support linkage adjusting assembly is arranged between the chair cushion framework and the leg support framework.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a height-adjustable seat. Background Technology

[0002] Height-adjustable chairs are widely used in offices, homes, and cars. In some usage scenarios, such as offices, the backrest of the height-adjustable chair needs to be adjusted to a flat position relative to the seat for easy reclining.

[0003] For example, CN111086421B discloses a method for adjusting a reclining car seat. This method utilizes a ratchet cover and pawl to allow the backrest frame to be adjusted to any angle during rotation. Furthermore, the linkage of the connecting frame, slider, linkage, backrest frame, and seat frame allows the seat frame to move forward and downward simultaneously, and the backrest frame to flip backward and slide forward simultaneously. While this seat structure allows the backrest to be adjusted to a reclining position relative to the seat cushion, many existing adjustable seats also include leg rests to further enhance comfort. When adjusting the backrest to a reclining position relative to the seat cushion, the leg rest must also be adjusted accordingly. Therefore, if the leg rest and backrest each require a separate mechanism for reclining relative to the seat cushion, it increases the complexity of the overall seat structure, raising production and operating costs.

[0004] Furthermore, the height adjustment function of a height-adjustable seat primarily relies on a height-adjustable support leg that moves the seat body up and down. This support leg can be driven pneumatically or electrically. Compared to pneumatic methods, electric mechanisms offer greater stability and safety. Regarding the electric-powered height adjustment mechanism, existing technologies typically suffer from two issues: firstly, the rapid lifting process results in a less than ideal user experience; secondly, when the seat is under load and the height needs to be adjusted upwards, the electric motor requires significant power and consumes more energy.

[0005] Therefore, for existing height-adjustable seats, further optimization of their overall structure is needed. Utility Model Content

[0006] The purpose of this invention is to provide a height-adjustable seat to solve the technical problem of optimizing its overall structure.

[0007] The height-adjustable seat of this utility model is implemented as follows:

[0008] A height-adjustable seat includes: a seat cushion frame, a backrest frame and a leg support frame respectively rotatably connected to the seat cushion frame, and height-adjustable support legs located at the bottom end of the seat cushion frame; wherein...

[0009] The lifting support leg includes a lower support tube, an upper support tube partially fitted onto the outer layer of the lower support tube, a lead screw assembly for driving the upper support tube to move up and down relative to the lower support tube, and an elastic element used in conjunction with the lead screw assembly to deform as the upper support tube moves up and down relative to the lower support tube; and

[0010] A backrest adjustment drive assembly is provided between the seat cushion frame and the backrest frame; a leg rest linkage adjustment assembly is provided between the seat cushion frame and the leg rest frame.

[0011] The backrest adjustment drive assembly includes a drive member adapted to make linear telescopic movement along the backrest frame toward the seat cushion frame, a telescopic rod connected to the drive member, and a connector located between the movable end of the telescopic rod away from the drive member and the backrest frame.

[0012] The leg support linkage adjustment assembly includes a linkage rod extending from the backrest frame to the leg support frame, a first connector disposed between the linkage rod and the backrest frame, and a second connector disposed between the linkage rod and the leg support frame.

[0013] In an optional embodiment of this utility model, the lower support tube includes a lower tube body having a hollow inner cavity and an opening located at one side end of the lower tube body that communicates with the hollow inner cavity.

[0014] The upper support tube includes an upper tube body with a hollow inner cavity and a pair of openings respectively provided at a pair of side ends of the upper tube body that communicate with the hollow inner cavity; the upper tube body is partially sleeved on the outside of the lower tube body, and the upper tube body is adapted to move up and down along the lower tube body.

[0015] The lead screw assembly includes a nut fixedly connected to the hollow inner cavity of the lower tube and a lead screw mating with the nut; the hollow inner cavity of the lower tube is provided with a connecting part connected to the nut; and

[0016] The upper tube body is provided with a support plate at the end away from the lower tube body, and one end of the screw rod passes through the support plate and extends into the hollow inner cavity of the upper tube body;

[0017] The elastic element is sleeved on the outer layer of the lead screw and clamped axially between the connecting part and the support plate.

[0018] In an optional embodiment of this invention, the elastic element is a tower-shaped spring;

[0019] The large outer diameter shaft end of the tower-shaped spring abuts against the support plate; and

[0020] The small outer diameter shaft end of the tower-shaped spring abuts against the connecting part.

[0021] In an optional embodiment of this utility model, a guide sleeve is further provided between the inner wall of the upper tube and the outer wall of the lower tube;

[0022] The guide sleeve is fixed to the inner wall of the upper tube.

[0023] In an optional embodiment of this utility model, the chair back frame has a support beam that is simultaneously connected to the connector and the first connector; the support beam is located at the corner where the chair back frame and the seat cushion frame are adjacent.

[0024] In an optional embodiment of this utility model, the connecting member has a U-shaped mating groove for hinged engagement with the telescopic rod;

[0025] The connector is fixed to the support beam.

[0026] In an optional embodiment of this utility model, the first connector has a connection port for hinged engagement with the linkage rod, and the first connector is fixed to the support beam.

[0027] In an optional embodiment of this utility model, the leg support frame has a support rod connected to the second connector;

[0028] The support rod is located at the corner where the leg support frame and the seat cushion frame are adjacent;

[0029] The second connector has a connecting portion for hinged engagement with the linkage rod, and the second connector is fixed to the support rod.

[0030] In an optional embodiment of this invention, the chair back frame is further provided with a massage component.

[0031] By adopting the above technical solution, this utility model has the following beneficial effects: In the lifting seat of this utility model, when the upper support tube moves downward relative to the lower support tube during the operation of the screw assembly, the elastic element helps to prevent the downward movement of the upper support tube relative to the lower support tube from being too fast, thus improving the comfort of the lifting seat during the descent process. On the other hand, the elastic element can be compressed and deformed as the lower support tube moves downward, thus playing a role in energy storage. This allows the upper support tube to move upward relative to the lower support tube when it needs to move upward. Not only can the movement of the screw drive the upper support tube, but the restoring effect of the elastic element can also assist the upward movement of the upper support tube, thereby reducing the pressure on the screw assembly caused by the load on the upper support tube. By designing a backrest adjustment drive assembly and a leg rest linkage adjustment assembly, when the telescopic rod retracts under the action of the drive component to pull the connecting component, the backrest frame is adapted to rotate outward relative to the seat cushion frame, gradually increasing the angle between the backrest frame and the seat cushion frame until the backrest frame is flat relative to the seat cushion frame. Simultaneously, as the backrest frame moves, the first connector drives the linkage rod to move towards the leg rest frame, further increasing the angle between the leg rest frame and the seat cushion frame until the leg rest frame is flat relative to the seat cushion frame. This structure allows for both backrest adjustment and leg rest adjustment simultaneously, requiring only one drive component, simplifying the structure and reducing production and operating costs. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the height-adjustable seat of this utility model in a sitting posture.

[0033] Figure 2 This is a first-view structural diagram of the lifting seat of this utility model in a flat position.

[0034] Figure 3 This is a schematic diagram of the second-view structure of the lifting seat of this utility model in a flat position;

[0035] Figure 4 This is a schematic diagram of the overall structure of the lifting support leg of the lifting seat of this utility model;

[0036] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the lifting support leg of the lifting seat of this utility model;

[0037] Figure 6 This is a partial structural diagram of the lifting support leg of the lifting seat of this utility model. Figure 1 ;

[0038] Figure 7 This is a partial structural diagram of the lifting support leg of the lifting seat of this utility model. Figure 2 ;

[0039] Figure 8 This is a schematic diagram of the frame structure of the lifting seat of this utility model in the sitting and reclining positions.

[0040] Figure 9 This is a schematic diagram of the frame structure of the lifting seat of this utility model in a flat position;

[0041] Figure 10 This is a schematic diagram of the frame structure of the lifting seat of this utility model in a flat position;

[0042] Figure 11 for Figure 8 Enlarged view of part A;

[0043] Figure 12 for Figure 8 Enlarged view of part B.

[0044] In the diagram: Lower tube 1, hollow inner cavity 11, connecting part 12, supporting chassis 2, upper tube 3, hollow inner cavity 31, guide sleeve 4, lead screw 5, screw 51, support plate 61, support seat 62, connecting plate 63, worm gear 71, worm 72, motor 73, tower spring 8, columnar body 91, annular connecting piece 92, chair seat frame 101, chair back frame 102, leg support frame 103, support beam 104, support rod 105, telescopic rod 201, connecting piece 202, U-shaped mating groove 2021, linear lead screw module 203, sleeve 204, linkage rod 301, first connector 302, connecting port 3021, second connector 303, connecting part 3031, hinge 401, armrest 500, connecting piece 601, connecting rod 602, movable piece 603, locking piece 605, massage component 700. Detailed Implementation

[0045] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0046] Example 1:

[0047] Please see Figures 1 to 12 As shown, this embodiment provides a height-adjustable seat, including: a seat cushion frame, a backrest frame and a leg support frame respectively rotatably connected to the seat cushion frame, and a height-adjustable support leg disposed at the bottom end of the seat cushion frame.

[0048] The lifting support leg includes a lower support tube, an upper support tube partially fitted on the outer layer of the lower support tube, a screw assembly for driving the upper support tube to move up and down relative to the lower support tube, and an elastic element used in conjunction with the screw assembly to deform as the upper support tube moves up and down relative to the lower support tube.

[0049] The lower support tube is located below the upper support tube. Regarding the general shape of both the lower and upper support tubes, both can be cylindrical tubes or rectangular columns. This embodiment does not impose an absolute limitation on their specific shapes; in this embodiment, the example using cylindrical tubes is provided with reference to the accompanying drawings. As for the material, to ensure strong support capabilities, both the upper and lower support tubes are made of metal.

[0050] Specifically, the first part is the lower support tube, which includes a lower tube body 1 with a hollow inner cavity 11 and an opening at one side end of the lower tube body 1 that communicates with the hollow inner cavity 11; a support base 2 is also provided at the side end of the lower tube body 1 away from the upper tube body 3, and the support base 2 here can be directly supported on the ground to play a supporting role at the bottom.

[0051] Secondly, there is an upper support tube, which includes an upper tube body 3 having a hollow inner cavity 31 and a pair of openings respectively provided on a pair of side ends of the upper tube body 3, which communicate with the hollow inner cavity 31; the upper tube body 3 is partially sleeved on the outside of the lower tube body 1, and the upper tube body 3 is adapted to move up and down along the lower tube body 1.

[0052] Based on the above structure, and considering that both the upper and lower support tubes are made of metal, a guide sleeve 4 is provided between the inner wall of the upper tube 3 and the outer wall of the lower tube 1 to reduce friction during the vertical movement of the upper support tube relative to the lower support tube. Specifically, the guide sleeve 4 is fixed to the inner wall of the upper tube 3. Optionally, the guide sleeve 4 is made of plastic; and the guide sleeve 4 is adapted to have an interference fit with the hollow inner cavity 31 of the upper tube 3. In this structure, when the upper tube 3 moves vertically relative to the lower tube 1, the plastic guide sleeve 4 directly rubs against the outer wall of the lower tube 1.

[0053] Next, we will explain the fit between the lead screw assembly and the upper and lower support tubes:

[0054] The lead screw assembly includes a nut fixedly connected to the hollow inner cavity 11 of the lower tube 1 and a lead screw 5 mating with the nut; wherein the hollow inner cavity 11 of the lower tube 1 is provided with a connecting part 12 connected to the nut. A support plate 61 is provided at the end of the upper tube 3 away from the lower tube 1, and one end of the lead screw 5 passes through the support plate 61 and extends into the hollow inner cavity 31 of the upper tube 3; the support plate 61 is also provided with a power structure for driving the lead screw 5 to rotate. The chair seat frame 101 is fixedly connected to the support plate 61, and the chair seat frame 101 is raised and lowered by the lifting and lowering movement of the upper support tube connected to the support plate 61 relative to the lower support tube.

[0055] The specific structure of the power structure is not absolutely limited in this embodiment. Any structure capable of driving the lead screw 5 to rotate meets the usage requirements of this embodiment. Referring to the accompanying drawings, one example is provided: the power structure includes a worm gear 71 located on the end of the lead screw 5 extending from the side of the support plate 61 facing away from the support tube; a worm 72 meshing with the worm gear 71; and a motor 73 for driving the worm 72. Furthermore, it should be noted that the motor 73 can be directly fixed to the support plate 61. A support seat 62 for rotating with the lead screw 5 is fixed to the side of the support plate 61 facing away from the support tube. This support seat 62 can be directly or indirectly fixed to the support plate 61 via a connecting plate 63. The lead screw 5 can engage with the support seat 62 via a bearing, and the support plate 61 has a through hole suitable for the lead screw 5 to pass through.

[0056] Regarding the fit between the lead screw 5 and the lower support tube: An assembly hole for mates with a nut is provided on the connecting part 12; the nut includes a cylindrical body 91 adapted to pass through the assembly hole and having an internal threaded hole for mates with the lead screw 5, and an annular connecting piece 92 integrally formed on the outer wall of the cylindrical body 91; wherein the annular connecting piece 92 is adapted to overlap the side end face of the connecting part 12 facing the upper tube 3, thereby fixing the nut through the connecting part 12. When the lead screw 5 rotates, the nut remains stationary, and the lead screw 5 support plate 61 and the upper support tube move together. In this structure, to avoid unexpected disengagement between the lead screw 5 and the nut, a screw 51 is fitted at the end of the lead screw 5 that passes through the internal threaded hole of the nut and is away from the support seat 62, and the outer diameter of the screw head end of the screw 51 is larger than the inner diameter of the internal threaded hole.

[0057] Next, it should be explained that the elastic element is sleeved on the outer layer of the lead screw 5 and axially sandwiched between the connecting part 12 and the support plate 61. That is, for the two axial ends of the elastic element, one axial end abuts against the support plate 61, and the other axial end abuts against the connecting part 12. Therefore, in order for the connecting part 12 to better support one axial end of the elastic element, the outer diameter of the connecting part 12 is larger than the outer diameter of the annular connecting piece 92, and the inner diameter of the axial end of the elastic element that abuts against the connecting part 12 is larger than the outer diameter of the annular connecting piece 92. With this structure, the connecting part 12 can simultaneously meet the fitting requirements of both the nut and the elastic element.

[0058] Based on the above, it should be noted that, theoretically, the elastic element here could be implemented using a columnar spring. However, considering the need to extend the service life of the elastic element, a tower-shaped spring 8 is used in this embodiment. The larger outer diameter shaft end of the tower-shaped spring 8 abuts against the support plate 61; and the smaller outer diameter shaft end of the tower-shaped spring 8 abuts against the connecting part 12. Here, the outer diameter of the larger outer diameter shaft end is larger than the outer diameter of the smaller outer diameter shaft end.

[0059] In this embodiment, when the upper support tube descends relative to the lower support tube during the operation of the screw assembly, the elastic element helps to prevent excessive descent speed, thus improving the comfort of the chair's descent. Furthermore, the elastic element can compress and deform as the lower support tube descends, storing energy. This ensures that when the upper support tube needs to rise relative to the lower support tube, not only does the screw 5 move the upper support tube, but the elastic element's resetting action also assists in the upward movement, thereby reducing the load on the upper support tube and the pressure on the screw assembly. Therefore, this invention optimizes the chair's height adjustment process through the use of the elastic element.

[0060] Based on the above structure, a backrest adjustment drive assembly is provided between the seat cushion frame 101 and the backrest frame 102; and a leg support linkage adjustment assembly is provided between the seat cushion frame 101 and the leg support frame 103.

[0061] In this embodiment, when the height-adjustable chair is used normally as a chair and the person is seated, the backrest frame forms an obtuse angle with respect to the seat cushion frame 101, which is slightly larger than a right angle. The leg rest frame 103 forms an angle with respect to the seat cushion frame 101, which is either a right angle or an obtuse angle slightly larger than a right angle. When the height-adjustable chair is to be used as a recliner, in its maximum deformation state, the backrest frame and leg rest frame 103 can form a flat angle or a very close flat angle with respect to the seat cushion frame 101.

[0062] In general, the backrest adjustment drive assembly includes a drive member adapted to perform linear telescopic movement along the backrest frame 102 toward the seat cushion frame 101, a telescopic rod 201 connected to the drive member, and a connector 202 located between the movable end of the telescopic rod 201 away from the drive member and the backrest frame 102. The telescopic rod 201 does not specifically refer to the rod itself being able to extend and retract, but rather to its ability to extend closer to and retract further away from the backrest frame under the action of the drive member. The drive member can be, for example, but not limited to, a cylinder or a linear screw module 203. When a cylinder is used, the telescopic rod 201 is connected to the piston rod of the cylinder. When a linear screw module 203 is used, the telescopic rod 201 can be connected to a screw body adapted to perform linear movement. In this case, the linear screw module 203 is equipped with a sleeve 204 fitted over the outer layer of the screw body. The telescopic rod 201 can move in and out of the sleeve 204 through linear movement under the action of the screw body. This embodiment does not impose absolute limitations on the specific structure and implementation principle of the driving component. As long as the driving component can drive the telescopic rod 201 to extend closer to the chair back frame and retract further away through a linear motion, the usage requirements of this embodiment can be met.

[0063] Secondly, the leg rest linkage adjustment assembly includes a linkage rod 301 extending from the backrest frame 102 towards the leg rest frame 103, a first connector 302 disposed between the linkage rod 301 and the backrest frame 102, and a second connector 303 disposed between the linkage rod 301 and the leg rest frame 103. The linkage rod 301 is parallel to the telescopic rod 201, allowing the linkage rod 301 and the telescopic rod 201 to follow each other. It should be noted that, in this embodiment, the leg rest linkage adjustment assembly can be symmetrically arranged in two forms, or only one form can be used, both meeting usage requirements. The specific number is not absolutely limited in this embodiment.

[0064] It should be noted that the backrest frame has a support beam 104 that is connected to both the connector 202 and the first connector 302. The support beam 104 is located at the corner where the backrest frame and the seat cushion frame 101 are adjacent. The leg support frame 103 has a support rod 105 that is connected to the second connector 303; the support rod 105 is located at the corner where the leg support frame 103 and the seat cushion frame 101 are adjacent.

[0065] More specifically, the connector 202 has a U-shaped groove 2021 for hinged engagement with the telescopic rod 201, for example, but not limited to, a connecting shaft; the connector 202 is fixed to the support beam 104. The length of the connector 202 along the direction from the backrest frame 102 to the seat cushion frame 101 is much smaller than the length of the telescopic rod 201. As the telescopic rod 201 moves a different distance relative to the backrest frame, the angle of the hinged engagement between the telescopic rod 201 and the connector 202 will also be different, resulting in different angles between the corresponding backrest frame and the seat cushion frame 101. This allows for adjustment of the backrest frame's operating angle, meeting different user needs and improving comfort.

[0066] The first connector 302 has a connection port 3021 for hinged engagement with the linkage rod 301 using, for example, but not limited to, a connecting shaft, and the first connector 302 is fixed to the support beam 104. The length of the first connector 302 along the direction from the backrest frame 102 to the seat cushion frame 101 is much smaller than the length of the linkage rod 301. Optionally, the length of the first connector 302 along the direction from the backrest frame 102 to the seat cushion frame 101 can be the same as the length of the connector 202. The second connector 303 has a connection portion 3031 for hinged engagement with the linkage rod 301 using, for example, but not limited to, a connecting shaft, and the second connector 303 is fixed to the support rod 105. The length of the second connector 303 along the direction from the seat cushion frame 101 to the leg rest frame 103 is much smaller than the length of the linkage rod 301. Here, the length of the second connector 303 along the direction from the backrest frame 102 to the seat cushion frame 101 can be the same as the length of the first connector 302. Alternatively, the length of the linkage rod 301 can be approximately the same as the length of the seat cushion frame 101 along the direction from the backrest frame 102 to the leg rest frame 103. Referring to the accompanying drawings, in one possible scenario, the connector 202 is approximately perpendicular to the support beam 104, and the first connector 302 is approximately perpendicular to the support beam 104, as is the second connector 303 relative to the support rod 105.

[0067] In this regard, it should also be noted that, regarding the seat in this embodiment, the rotatable connection between the backrest frame 102 and the seat cushion frame 101, and the rotatable connection between the leg support frame 103 and the seat cushion frame 101, can be achieved using any mature means in the prior art. This embodiment does not impose an absolute limitation on this; here, we will illustrate an optional implementation with reference to the accompanying drawings:

[0068] A pair of hinges 401 are also provided between the leg support frame 103 and the seat cushion frame 101. A pair of connecting rod assemblies, corresponding one-to-one with the armrests 500 on the backrest frame, are also provided between the backrest frame and the seat cushion frame 101. These connecting rod assemblies include a connecting piece 601 connected to the seat cushion frame 101, a connecting rod 602 with one end rotatably engaged with the connecting piece 601, and a movable piece 603 with the end of the connecting rod 602 away from the connecting piece 601; wherein the end of the movable piece 603 away from the connecting rod 602 rotatably engages with a locking piece 605 fixed to the backrest frame. The length of the connecting rod 602 is much greater than the lengths of the connecting piece 601 and the movable piece 603. In this structure, when the backrest frame adjusts the angle between itself and the seat cushion frame 101 under the action of the backrest adjustment drive component, the linkage assembly deforms accordingly. In other words, the linkage assembly can not only satisfy the reliable connection between the backrest frame 102 and the seat cushion frame 101, but also meet the linkage requirements during the deformation process of the two, thereby improving the reliability of the mating structure formed by the two.

[0069] In summary, for the height-adjustable seat of this embodiment, when the telescopic rod 201 retracts under the action of the drive member to pull the connecting member 202, the backrest frame is adapted to rotate outward relative to the seat cushion frame 101 so that the angle formed between the backrest frame and the seat cushion frame 101 gradually increases until the backrest frame is flat relative to the seat cushion frame 101. At the same time, as the backrest frame 102 moves, the first connector 302 drives the linkage rod 301 to move towards the leg support frame 103 so that the angle formed between the leg support frame 103 and the seat cushion frame 101 gradually increases until the leg support frame 103 is flat relative to the seat cushion frame 101 (of course, in the actual use of the seat, it is not necessary to adjust the backrest frame 102 and the leg support frame 103 to be flat relative to the seat cushion frame 101 every time; flattening is just one of the most extreme adjustment situations). When the telescopic rod 201 extends under the action of the driving component to push the connecting member 202, the backrest frame is adapted to rotate inward relative to the seat cushion frame 101, so that the angle between the backrest frame and the seat cushion frame 101 gradually decreases until the backrest frame is perpendicular to the seat cushion frame 101. At the same time, with the movement of the backrest frame, the first connecting head 302 drives the linkage rod 301 to move away from the leg support frame 103, so that the angle between the leg support frame 103 and the seat cushion frame 101 gradually decreases until the leg support frame 103 is perpendicular. In other words, the size of the angles formed by the seat cushion frame 101 and the backrest frame relative to the seat cushion frame 101 is controlled by the size of the movement trajectory of the telescopic rod 201 under the action of the driving component.

[0070] Example 2:

[0071] Please see Figures 1 to 4As shown, based on the height-adjustable seat of Embodiment 1, the height-adjustable seat provided in this embodiment further includes a massage component 700 mounted on the backrest frame. This massage component 700 is used to massage the back of a person sitting on the height-adjustable seat. Regarding the structure of the massage component 700 itself, any mature method from the prior art can be used; this embodiment does not impose absolute limitations on this, such as, but not limited to, the multifunctional massage device disclosed in publication number CN102727367A or the massage structure with multi-directional massage effects disclosed in publication number CN205569288U. By directly assembling the massage component onto the backrest frame, the overall functionality of the height-adjustable seat can be improved, meeting the massage needs of people in a state of fatigue.

[0072] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0073] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0074] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0076] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0077] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A lifting seat, characterized in that The chair backrest framework and the leg rest framework are respectively rotatably connected with the chair cushion framework, and a lifting support leg is arranged at the bottom end of the chair cushion framework. The lifting support leg comprises a lower support pipe, an upper support pipe partially sleeved outside the lower support pipe, a screw rod assembly for driving the upper support pipe to make lifting movement relative to the lower support pipe, and an elastic member adapted to deform with the lifting movement of the upper support pipe relative to the lower support pipe and used in cooperation with the screw rod assembly. The chair backrest adjusting drive assembly is arranged between the chair cushion framework and the chair backrest framework, and the leg rest linkage adjusting assembly is arranged between the chair cushion framework and the leg rest framework. The chair backrest adjusting drive assembly comprises a drive member adapted to make linear extension and retraction movement in the direction from the chair backrest framework to the chair cushion framework, an extension and retraction rod connected with the drive member, and a connecting member arranged between the movable end of the extension and retraction rod away from the drive member and the chair backrest framework. The leg rest linkage adjusting assembly comprises a linkage rod extending from the chair backrest framework to the leg rest framework, a first connecting head arranged between the linkage rod and the chair backrest framework, and a second connecting head arranged between the linkage rod and the leg rest framework. The lower support pipe comprises a lower pipe body formed with a hollow inner cavity and an opening arranged at one side end of the lower pipe body and penetrating through the hollow inner cavity. The upper support pipe comprises an upper pipe body formed with a hollow inner cavity and a pair of openings arranged at a pair of side ends of the upper pipe body and penetrating through the hollow inner cavity; the upper pipe body is partially sleeved outside the lower pipe body and is adapted to make lifting movement along the lower pipe body.

2. The lift chair of claim 1, wherein, The screw rod assembly comprises a nut fixedly connected with the hollow inner cavity of the lower pipe body and a screw rod matched with the nut; the hollow inner cavity of the lower pipe body is provided with a connecting portion connected with the nut; and One end of the upper pipe body away from the lower pipe body is provided with a support plate, and one end of the screw rod penetrates through the support plate and extends into the hollow inner cavity of the upper pipe body. The elastic member is sleeved outside the screw rod and is axially clamped between the connecting portion and the support plate. The elastic member adopts a tower-shaped spring. The large-diameter shaft side end of the tower-shaped spring abuts against the support plate; and 3. The lift chair of claim 2, wherein, The small-diameter shaft side end of the tower-shaped spring abuts against the connecting portion. A guide sleeve is further arranged between the inner wall of the upper pipe body and the outer wall of the lower pipe body. The guide sleeve is fixed on the inner wall of the upper pipe body.

4. A lifting seat according to claim 2 or 3, characterised in that The chair backrest framework has a support beam connected with the connecting member and the first connecting head; the support beam is located at the corner part adjacent to the chair cushion framework of the chair backrest framework. The connecting member has a U-shaped matching groove for hinged matching with the extension and retraction rod.

5. The lift chair of claim 1, wherein, The connecting member is fixed on the support beam.

6. The lift chair of claim 5, wherein, The first connecting head has a connecting port for hinged matching with the linkage rod, and the first connecting head is fixed on the support beam. The leg rest framework has a support rod connected with the second connecting head.

7. A lifting seat according to claim 5 or 6, characterised in that The support rod is located at the corner part adjacent to the chair cushion framework of the leg rest framework.

8. The lift chair of claim 1, wherein, The second connecting head has a connecting portion for hinged matching with the linkage rod, and the second connecting head is fixed on the support rod. The chair backrest framework is further provided with a massage assembly. ​ 9. The lift chair of claim 1, wherein, ​

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