Seat lifting device

Abstract

The utility model discloses a seat lifting device which comprises a seat leg and a supporting rod, the seat leg comprises a sliding supporting part with a sleeve-shaped top end, a connecting groove is formed in the sliding supporting part in the vertical direction, and the supporting rod is slidably connected to the sliding supporting part through the connecting groove; a gear adjusting mechanism is arranged between the connecting groove and the supporting rod and comprises a gear groove and a clamping head, the gear groove is formed in one of the groove wall of the connecting groove and the side wall of the supporting rod, and the clamping head is arranged on the other one of the groove wall of the connecting groove and the side wall of the supporting rod; the gear groove comprises a sliding groove channel extending in the vertical direction, and at least one of the left side and the right side of the sliding groove channel is transversely sunken to form a plurality of gear groove channels. According to the seat lifting device, a user rotates the seat to drive the supporting rod to rotate, the clamping head can be driven to be clamped into the gear groove channel to achieve gear fixing or clamped into the sliding groove channel to adjust the height, adjusting operation is easy, and cost is low; and the gravity center of the chair seat can stably fall on the center of the chair leg supporting surface, so that the stability is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sitting furniture, and particularly relates to a seat lifting device. BACKGROUND

[0002] A seat is common sitting furniture in daily life. In the office field, the existing office chair usually uses a gas rod as a support rod between a bottom disc and five claw feet, so that the office chair can not only adjust the height of a seat through the extension and retraction of the gas rod, but also can rotate the gas rod relative to the five claw feet, thereby driving the top seat to rotate, and the seat can also slide freely according to the universal wheels on the five claw feet, so that the degree of freedom is high.

[0003] However, in some use scenarios, in order to make the seat more stable and not easy to shake, people usually need to use a seat with fixed chair feet. The chair feet of the fixed chair feet seat on the market are usually directly fixed to the bottom of the seat, or a support rod with a fixed length is connected between the chair feet and the bottom disc, so that the seat height of the seat cannot be adjusted. If a gas rod is arranged between the fixed chair feet and the bottom disc, the following problems will exist: 1. The cost required for using the gas rod is high, so as to increase the selling price of the seat, which is not convenient for popularization; 2. After the gas rod is used, the seat can rotate relative to the fixed chair feet together with the gas rod, however, for the general fixed chair feet, the support surface is not circular, which makes the center of gravity of the seat when rotating cannot fall on the center of the support surface, so that the stability of the seat is poor, and there is a risk of overturning.

[0004] Therefore, how to make the fixed chair feet seat adjust the seat height without using the gas rod has become the main problem to be solved at present. SUMMARY

[0005] In view of the above defects or deficiencies in the prior art, it is expected to provide a seat lifting device, when a user rotates the seat to drive the support rod to rotate, the clamping head can be clamped into the gear slot to realize gear fixing or clamped into the sliding groove to adjust the height, which is not only simple in adjustment operation, but also does not need to use the gas rod, and the cost is low; the orientation of the seat before and after adjustment is unchanged, so that the center of gravity of the seat can be stably fallen on the center of the support surface of the chair feet, and the stability is good.

[0006] The effect of the utility model is realized as follows:

[0007] The application provides a seat lifting device, which comprises a chair leg and a supporting rod, the chair leg comprises a top-end sleeve-shaped sliding support part, the sliding support part is formed with a sliding cavity in the vertical direction, the supporting rod is slidably connected to the sliding support part through the sliding cavity, and the top end of the supporting rod is configured to be connected to a seat; a gear adjusting mechanism is arranged between the sliding cavity and the supporting rod, the gear adjusting mechanism comprises a gear slot and a clamping head, the gear slot is arranged on one of the sliding cavity slot wall and the supporting rod side wall, and the clamping head is arranged on the other one of the sliding cavity slot wall and the supporting rod side wall; the gear slot comprises a sliding groove extending in the vertical direction, and at least one side of the sliding groove is transversely recessed to form a plurality of gear groove channels.

[0008] The seat lifting device has switchable adjusting and using states, the supporting rod can rotate relative to the sliding support part in the circumferential direction, when the supporting rod is rotated to make the clamping head clamped into the gear groove channel, the clamping head abuts against the upper side wall of the gear groove channel, so that the supporting rod cannot slide downward relative to the chair leg, and the seat lifting device enters the using state; when the supporting rod is rotated to make the clamping head clamped into the sliding groove, the clamping head can slide up and down along the sliding groove, so that the supporting rod can slide up and down relative to the chair leg, and the seat lifting device enters the adjusting state.

[0009] Further, the supporting rod is in a tubular structure, the supporting rod side wall is hollow to form the gear slot, and the clamping head is correspondingly arranged in the sliding cavity. Not only is the machining simple, but also the supporting rod is not stopped by the clamping head when the supporting rod is assembled or disassembled, so that the assembly and disassembly operation between the supporting rod and the sliding support part is more convenient.

[0010] Further, the upper side wall of the gear groove channel is recessed upward to form a limiting part; in the using state, the clamping head slides into the gear groove channel, when the supporting rod is pressed, the clamping head is clamped into the limiting part and cannot continue to slide in the horizontal direction, so that the sliding support part and the supporting rod are kept relatively fixed in the horizontal direction. In the using state, the seat does not rotate when the user applies a left-right torsional force to the seat, so that the stability of the seat is better.

[0011] Further, a plurality of positioning protrusions are protruded on the side wall of the sliding groove away from the gear groove channel, the positioning protrusions are opposite to the gear groove channel, and the positioning protrusions are configured to guide the clamping head to slide into the gear groove channel. The user does not need to constantly observe the position of the clamping head in the gear slot during the adjusting process, so that the height adjusting operation of the seat is effectively improved in simplicity.

[0012] Further, a connecting hole is radially hollowed out on the side wall of the sliding support part, the connecting hole has an internal thread, and a locking mechanism is further arranged on the sliding support part, the locking mechanism comprises a locking piece, the locking piece comprises a threaded part with an external thread, the threaded part is threadedly connected to the sliding support part through the connecting hole, and when the locking piece rotates, the threaded part is driven to move back and forth relative to the sliding support part; in the use state, the threaded part moves towards the support rod until the support rod is pressed against the inner wall of the sliding cavity, so that the support rod and the sliding support part are relatively fixed; in the adjustment state, the threaded part moves away from the support rod, so that the support rod can be repositioned relative to the sliding support part. The rotation of the locking piece is converted into the movement of the threaded part in the front-back direction, which in turn drives the threaded part to press or avoid the support rod, thereby realizing the locking or unlocking operation between the support rod and the sliding support part, which is simple in structure and convenient to lock, unlock and adjust.

[0013] Further, the end of the threaded part close to the support rod is protruded to form a clamping head, so that the clamping head can be driven to move back and forth by the threaded part. Not only is the structure simple, but also the clamping head can be installed and removed together with the locking piece in the sliding support part, so that the assembly operation of the seat lifting device is more convenient.

[0014] Further, the locking mechanism further comprises an inner nest, the inner nest is embedded in the sliding support part through the sliding cavity; the inner nest comprises a squeezing part movably arranged on the side wall, and the squeezing part faces the connecting hole; in the use state, the threaded part pushes the squeezing part, and the support rod is pressed against the inner wall of the sliding cavity through the squeezing part. The abrasion of the support rod during movement is reduced, and the service life of the seat lifting device is prolonged, which is good in practicability.

[0015] Further, the locking mechanism further comprises a gasket, the gasket is attached to the squeezing part, and the threaded part pushes the squeezing part through the gasket. Not only does it increase the contact area between the threaded part and the squeezing part, prevent loosening, and have better stability, but also it has a buffering effect, prolonging the service life of the seat lifting device.

[0016] Further, the inner nest and the sliding support part are detachably connected through a clamping hook mechanism, the clamping hook mechanism comprises a clamping hook arranged on one of the end of the inner nest and the end of the sliding support part. Not only is the connection strength good and the stability high, but also the assembly and disassembly operation is very simple.

[0017] The seat lifting device provided by the application can adjust the height of the seat relative to the chair leg by sleeving the support rod on the sliding support part and adjusting the up and down sliding of the support rod relative to the sliding support part. When the user sits on the seat, the seat lifting device is in the use state, the clamping head is clamped into the gear slot, the support rod and the sliding support part are relatively fixed, and the seat can stably support the user. When the user needs to adjust the height of the seat, the user only needs to rotate the seat to drive the synchronous rotation of the support rod, and the clamping head slides into the sliding groove, so that the seat can be pulled up and down to drive the up and down sliding of the support rod relative to the sliding support part. When the height is adjusted to the appropriate gear, the user only needs to rotate the seat in the opposite direction to make the clamping head re-clamp into the gear slot, so that the support rod and the sliding support part are relatively fixed again, that is, the height of the seat is fixed. Therefore, the height of the seat is adjusted by a mechanical structure, which is simple to operate and low in cost without the use of an air rod. The orientation of the seat does not change before and after adjustment, so that even if the fixed chair leg is not circular, the seat can keep the center of gravity of the seat in the use state on the center of the support surface of the chair leg, avoiding side turning and being good in stability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings:

[0019] Figure 1 The seat lifting device provided by the application provides a perspective structural schematic view;

[0020] Figure 2 The seat lifting device provided by the application provides a perspective structural schematic view;

[0021] Figure 3 The seat lifting device provided by the application provides a perspective structural schematic view;

[0022] Figure 4 The seat lifting device provided by the application provides a perspective structural schematic view;

[0023] Figure 5 The seat lifting device provided by the application provides a perspective structural schematic view;

[0024] Figure 6 The seat lifting device provided by the application provides a perspective structural schematic view;

[0025] Figure 7 The seat lifting device provided by the application provides a perspective structural schematic view;

[0026] Figure 8 A schematic diagram of the connection structure between the locking member and the sliding support part in the adjusting state provided by the embodiment of the present application is shown in the figure;

[0027] Figure 9 A schematic diagram of the connection structure between the locking member and the sliding support part in the using state provided by the embodiment of the present application is shown in the figure.

[0028] The reference numerals are as follows: 1-chair leg, 101-support part, 110-sliding support part, 111-sliding cavity, 112-connection hole, 120-locking member, 121-clamping head, 122-threaded part, 123-handle part, 130-inner nest, 131-pressing part, 132-claw, 133-first avoiding hole, 140-gasket, 141-second avoiding hole, 2-supporting rod, 210-gear slot, 211-sliding groove, 212-gear groove, 213-limiting part, 214-positioning protrusion. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and are not a limitation on the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings.

[0030] Please refer to the drawings Figures 1-9 The embodiment of the present application provides a seat lifting device, which comprises a chair leg 1 and a supporting rod 2. The chair leg 1 comprises a top-end sleeve-shaped sliding support part 110, and a sliding cavity 111 is formed in the sliding support part 110 along the vertical direction. The supporting rod 2 is connected to the sliding support part 110 through the sliding cavity 111, and the top end of the supporting rod 2 is configured to connect a seat. A gear adjusting mechanism is arranged between the sliding cavity 111 and the supporting rod 2. The gear adjusting mechanism comprises a gear slot 210 and a clamping head 121. The gear slot 210 is arranged on one of the groove wall of the sliding cavity 111 and the side wall of the supporting rod 2, and the clamping head 121 is arranged on the other one of the groove wall of the sliding cavity 111 and the side wall of the supporting rod 2. The gear slot 210 comprises a sliding groove 211 extending along the vertical direction, and at least one side of the sliding groove 211 is laterally recessed to form a plurality of gear grooves 212.

[0031] The seat lifting device has switchable adjustment state and use state, the support rod 2 can rotate relative to the sliding support part 110 in the circumferential direction, when the support rod 2 is rotated so that the clamping head 121 is clamped into the gear slot 212, the clamping head 121 abuts against the upper side wall of the gear slot 212, so that the support rod 2 cannot slide downward relative to the chair leg 1, and the seat lifting device enters the use state; when the support rod 2 is rotated so that the clamping head 121 is clamped into the sliding slot 211, the clamping head 121 can slide up and down along the sliding slot 211, and then the support rod 2 can slide up and down relative to the chair leg 1, and the seat lifting device enters the adjustment state.

[0032] In the embodiment, the sliding support part 110 is sleeved with the support rod 2, and as the support rod 2 slides up and down relative to the sliding support part 110 for adjustment, the height of the seat relative to the chair leg 1 can also be adjusted. Moreover, by arranging the gear adjustment mechanism between the sliding support part 110 and the support rod 2, please refer to the accompanying drawings Figure 3 When the user sits on the seat, the seat lifting device is in the use state, the clamping head 121 is clamped into the gear slot 212, so that the support rod 2 and the sliding support part 110 are relatively fixed, and the seat can stably support the user; please refer to the accompanying drawings Figure 4 When the user needs to adjust the height of the seat, only needs to rotate the seat to drive the support rod 2 to rotate synchronously, and make the clamping head 121 slide into the sliding slot 211, and then can pull the seat up and down to drive the support rod 2 to slide up and down relative to the sliding support part 110; please refer to the accompanying drawings Figure 6 When the adjustment is to the appropriate gear, only needs to rotate the seat in the opposite direction to make the clamping head 121 re-clamp into the gear slot 212, and then can make the support rod 2 and the sliding support part 110 relatively fixed again, that is, fix the height of the seat. Thus, the height of the seat is adjusted by the mechanical structure, not only the adjustment operation is simple, but also does not need to use the air rod, and the cost is lower; the orientation of the seat does not change before and after the adjustment, so that even if the fixed chair leg is not circular, the seat can keep the center of gravity of the seat in the use state falling on the center of the support surface of the chair leg 1, and the stability is better.

[0033] Preferably, the gear slot 212 is located on the left side of the sliding slot 211, and four gear slots 212 are arranged on the sliding slot 211, so that the seat has four gears for adjustment, and the degree of freedom is higher. Of course, in other embodiments of the present application, the number of gear slots 212 can also be two, three, five, etc.

[0034] The chair leg 1 is a fixed structure, including two support parts 101 which are parallel to each other and grounded, and the upper ends of the two support parts 101 meet at the sliding support part 110, so that the support surface of the chair leg 1 is square.

[0035] Please refer to the accompanying drawings Figure 2In some embodiments of the present application, the support rod 2 is a tubular structure, and the side wall of the support rod 2 is hollowed out to form the gear slot 210, and the clamping head 121 is located in the sliding cavity 111.

[0036] In the present embodiment, by hollowing out the gear slot 210 on the side wall of the tubular support rod 2, not only is the machining simple, but also the support rod 2 is not stopped by the clamping head 121 when being assembled or disassembled, so that the assembly and disassembly operation between the support rod 2 and the sliding support part 110 is more convenient.

[0037] Please refer to the accompanying drawings Figures 2-6 In some embodiments of the present application, the upper side wall of the gear slot 212 is recessed upward to form a limiting part 213; in the use state, the clamping head 121 slides into the gear slot 212, and when the support rod 2 is pressed, the clamping head 121 is clamped into the limiting part 213 and cannot continue to slide in the horizontal direction, so that the sliding support part 110 and the support rod 2 are relatively fixed in the horizontal direction.

[0038] In the present embodiment, by setting the limiting part 213, in the use state, when the seat is pressed by the user, the support rod 2 is driven to have a downward sliding trend, and because the clamping head 121 abuts against the limiting part 213, the support rod 2 is kept fixed, and the seat can also stably support the user; and the clamping head 121 cannot slide left and right in the limiting part 213, that is, the support rod 2 cannot continue to rotate, so that when the user sitting on the seat applies a left and right twisting force to the seat, the seat will not rotate, thereby making the stability of the seat better.

[0039] Of course, in other embodiments of the present application, the clamping head 121 can also be arranged on the side wall of the support rod 2, and the inner wall of the sliding cavity 111 is recessed to form the gear slot 210. In the use state, the support rod 2 is pressed to have a downward movement trend, and drives the clamping head 121 to abut against the lower side wall of the gear slot 212, and thus the lower side wall of the gear slot 212 is recessed to form a limiting part 213, so that the clamping head 121 in the use state can be clamped into the limiting part 213 and limit the rotation of the support rod 2.

[0040] Please refer to the accompanying drawings Figures 2-6 In some embodiments of the present application, a plurality of positioning protrusions 214 are protruded on the side wall of the sliding slot 211 away from the gear slot 212, the positioning protrusions 214 are opposite to the gear slot 212, and the positioning protrusions 214 are configured to guide the clamping head 121 to slide into the gear slot 212.

[0041] In the present embodiment, because the support rod 2 is located at the bottom of the seat, in the adjustment state, the user is not convenient to directly observe the position of the clamping head 121 in the gear slot 210, so as to be not convenient to judge the position of the gear slot 212. Therefore, please refer to the accompanying drawings Figure 5, by setting positioning protrusions 214 on the sliding groove 211 opposite the gear groove 212, so that in the adjustment state, when the user pulls the seat up and down and drives the clamping head 121 to slide in the sliding groove 211, every time the clamping head 121 touches the positioning protrusion 214, the support rod 2 cannot continue to slide and the user feels a pause touch, reminding the user that the current position is opposite the gear groove 212, and only needs to rotate the seat in the horizontal direction to drive the clamping head 121 to be clamped into the gear groove 212, switching to the use state. Thus, the user does not need to constantly watch the position of the clamping head 121 in the gear groove 210 during adjustment, effectively improving the simplicity of the seat height adjustment operation.

[0042] Please refer to the accompanying drawings Figures 7-9 In some embodiments of the present application, the side wall of the sliding support part 110 is radially hollowed out to form a connecting hole 112, the connecting hole 112 has an internal thread, and the sliding support part 110 is further provided with a locking mechanism, the locking mechanism includes a locking piece 120, the locking piece 120 includes a threaded part 122 with an external thread, the threaded part 122 is threadedly connected to the sliding support part 110 through the connecting hole 113, and when the locking piece 120 rotates, the threaded part 122 is driven to move back and forth relative to the sliding support part 110; in the use state, the threaded part 122 moves towards the support rod 2 until the support rod 2 is pressed against the inner wall of the sliding cavity 111, so that the support rod 2 and the sliding support part 110 are relatively fixed; in the adjustment state, the threaded part 122 moves away from the support rod 2, so that the support rod 2 can move relative to the sliding support part 110 again.

[0043] In the present embodiment, by screwing the threaded part 122 to the sliding support part 110, the rotation of the locking piece 120 is converted into the movement of the threaded part 122 in the front and back directions, thereby driving the threaded part 122 to press or avoid the support rod 2, so as to realize the locking or unlocking operation between the support rod 2 and the sliding support part 110, which is simple in structure and easy to operate.

[0044] The locking piece 120 further includes a handle part 123 at the front end of the threaded part 122, and the handle part 123 has a larger width, thereby facilitating the user to turn the locking piece 120.

[0045] Please refer to the accompanying drawings Figures 7-9 In some embodiments of the present application, the end of the threaded part 122 near the support rod 2 protrudes to form a clamping head 121, so that the clamping head 121 can be driven to move back and forth by the threaded part 122.

[0046] In the present embodiment, by setting the clamping head 121 and the locking piece 120 as an integrated structure, not only is the structure simple, but also the clamping head 121 can be installed and removed together with the locking piece 120 on the sliding support part 110, so that the assembly operation of the seat lifting device is relatively simple.

[0047] Of course, in other embodiments of the present application, the clamping head 121 and the locking member 120 can be separately arranged, and the clamping head 121 is arranged on the inner wall of the sliding cavity 111 away from the threaded portion 122.

[0048] Please refer to the accompanying drawings Figure 7 In some embodiments of the present application, the locking mechanism further comprises an inner nest 130, which is embedded in the sliding support portion 110 through the sliding cavity 111; the inner nest 130 comprises an extrusion portion 131 movably arranged on the side wall, and the extrusion portion 131 is opposite to the connecting hole 112; in use, the threaded portion 122 pushes the extrusion portion 131, and the extrusion portion 131 presses the support rod 2 against the inner wall of the sliding cavity 111.

[0049] In the present embodiment, the support rod 2 is connected to the sliding support portion 110 through the hollow portion of the inner nest 130, and the threaded portion 122 presses or avoids the support rod 2 by pushing the extrusion portion 131 on the inner nest 130; the inner nest 130 is made of wear-resistant material, thereby reducing the frictional force on the support rod 2, reducing the wear of the support rod 2 during movement, prolonging the service life of the seat lifting device, and having good practicability.

[0050] The extrusion portion 131 is provided with a first avoiding hole 133, and the clamping head 121 on the threaded portion 122 passes through the first avoiding hole 133 and enters the gear slot 210.

[0051] Please refer to the accompanying drawings Figure 7 In some embodiments of the present application, the locking mechanism further comprises a gasket 140, which is attached to the extrusion portion 131, and the threaded portion 122 pushes the extrusion portion 131 through the gasket 140.

[0052] In the present embodiment, by arranging the gasket 140 between the threaded portion 122 and the extrusion portion 131, the gasket 140 not only increases the contact area between the threaded portion 122 and the extrusion portion 131, but also makes the pressure applied by the threaded portion 122 to the extrusion portion 131 more uniform, prevents loosening, and has better stability; and when the seat lifting device is impacted, the gasket 140 acts as a buffer, thereby reducing damage to the threaded portion 122 and the extrusion portion 131, and prolonging the service life of the seat lifting device.

[0053] The gasket 140 is provided with a second avoiding hole 141, and the clamping head 121 on the threaded portion 122 passes through the second avoiding hole 141 and enters the gear slot 210.

[0054] Please refer to the accompanying drawings Figure 7In some embodiments of the present application, the inner nest 130 and the sliding support part 110 are detachably connected through a snap mechanism, which includes a snap 132 arranged on one of the end of the inner nest 130 and the end of the sliding support part 110.

[0055] In the present embodiment, the inner nest 130 is connected with the sliding support part 110 through the snap mechanism, which not only has good connection strength and high stability, but also can be easily assembled and disassembled through the elastic deformation of the snap 132.

[0056] Preferably, the snap 132 is arranged at the bottom end of the inner nest 130, and when the inner nest 130 is snapped into the sliding support part 110, the snap 132 is snapped with the lower edge of the sliding support part 110, thereby realizing the assembly operation between the two. Of course, in other embodiments of the present application, the snap 132 can also be arranged at the top end of the inner nest 130 or the inner wall of the sliding cavity 111.

[0057] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is more than three.

[0058] The above description is only the preferred embodiments of the present application and the explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by replacing the above-mentioned features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A seat lifting device, characterized by The chair leg (1) comprises a top-end sleeve-shaped sliding support part (110) with a sliding cavity (111) formed in the vertical direction inside the sliding support part (110), and the support rod (2) is slidably connected to the sliding support part (110) through the sliding cavity (111), and the top end of the support rod (2) is configured to be connected to a chair seat; a gear adjusting mechanism is arranged between the sliding cavity (111) and the support rod (2), the gear adjusting mechanism comprises a gear slot (210) and a clamping head (121), the gear slot (210) is arranged on one of the sliding cavity (111) groove wall and the support rod (2) side wall, and the clamping head (121) is arranged on the other one of the sliding cavity (111) groove wall and the support rod (2) side wall; the gear slot (210) comprises a sliding groove (211) extending in the vertical direction, and at least one side of the sliding groove (211) is transversely recessed to form a plurality of gear grooves (212). The seat lifting device has switchable adjusting state and use state, the support rod (2) can rotate relative to the sliding support part (110) in the circumferential direction, when the support rod (2) is rotated so that the clamping head (121) is clamped into the gear groove (212), the clamping head (121) abuts against the upper side wall of the gear groove (212), so that the support rod (2) cannot slide downward relative to the chair leg (1), and the seat lifting device enters the use state; when the support rod (2) is rotated so that the clamping head (121) is clamped into the sliding groove (211), the clamping head (121) can slide up and down along the sliding groove (211), and then the support rod (2) can slide up and down relative to the chair leg (1), and the seat lifting device enters the adjusting state.

2. The seat lift device of claim 1, wherein The support rod (2) is a tubular structure, and the side wall of the support rod (2) is hollow to form the gear slot (210), and the clamping head (121) is correspondingly located in the sliding cavity (111).

3. The seat lift device of claim 2, wherein, The upper side wall of the gear groove (212) is recessed upward to form a limiting part (213); in the use state, the clamping head (121) slides into the gear groove (212), when the support rod (2) is pressed, the clamping head (121) is clamped into the limiting part (213) and cannot continue to slide in the horizontal direction, so that the sliding support part (110) and the support rod (2) are relatively fixed in the horizontal direction.

4. The seat lift device of claim 1, wherein, The side wall of the sliding groove (211) away from the gear groove (212) is protruded with a plurality of positioning protrusions (214), the positioning protrusions (214) are opposite to the gear groove (212), and the positioning protrusions (214) are configured to guide the clamping head (121) to slide into the gear groove (212).

5. The seat lift of claim 1, wherein, The side wall of the sliding support part (110) is radially hollowed to form a connecting hole (112) with internal thread, and the sliding support part (110) is further provided with a locking mechanism, which comprises a locking piece (120) including a threaded part (122) with external thread, the threaded part (122) being threadedly connected to the sliding support part (110) through the connecting hole (112), and when the locking piece (120) rotates, the threaded part (122) is driven to move back and forth relative to the sliding support part (110); in use, the threaded part (122) moves towards the support rod (2) until the support rod (2) is pressed against the inner wall of the sliding cavity (111), so that the support rod (2) and the sliding support part (110) are relatively fixed; in adjustment, the threaded part (122) moves away from the support rod (2), so that the support rod (2) can move relative to the sliding support part (110) again.

6. The seat lift device of claim 5, wherein, The threaded part (122) protrudes to form a clamping head (121) near the end of the support rod (2), so that the clamping head (121) can be driven to move back and forth by the threaded part (122).

7. The seat lift device of claim 5, wherein, The locking mechanism further comprises an inner nest (130) embedded in the sliding support part (110) through the sliding cavity (111); the inner nest (130) comprises a squeezing part (131) movable back and forth on the side wall, and the squeezing part (131) faces the connecting hole (112); in use, the threaded part (122) pushes the squeezing part (131), and the support rod (2) is pressed against the inner wall of the sliding cavity (111) through the squeezing part (131).

8. The seat lift device of claim 7, wherein, The locking mechanism further comprises a gasket (140) attached to the squeezing part (131), and the threaded part (122) pushes the squeezing part (131) through the gasket (140).

9. The seat lift of claim 7, wherein, The inner nest (130) and the sliding support part (110) are detachably connected through a clamping mechanism, and the clamping mechanism comprises a clamping hook (132) arranged on one of the end of the inner nest (130) and the end of the sliding support part (110).

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