Lifting mechanism and seat

Abstract

The utility model provides a lifting mechanism and a seat, the lifting mechanism comprises a support, a lifting seat arranged on the support in a lifting mode and an operating rod arranged on the lifting seat in a rotating mode, and the lifting seat and the support are locked or unlocked through a locking piece and a locking part. The operating rod controls the locking part to be connected with or separated from the locking part by controlling the swinging part to swing, and because the operating rod is directly arranged on the lifting seat, when the operating rod unlocks the lifting seat and the bracket, a user can adjust the height of the lifting seat by directly adjusting the height of the operating rod, so that the operating rod can be operated to unlock and adjust the height in one step; operation can be completed with one hand, operation is easy, and use is convenient; the seat comprises a waist rest, armrests and the lifting mechanism, the waist rest and the armrests are arranged on the lifting seat, and the waist rest and the armrests ascend and descend on the support along with the movement of the lifting seat; the lifting mechanism can achieve lifting movement of the waist rest and the armrests at the same time, and the waist rest and the armrests can be adjusted together during lifting adjustment.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a lifting mechanism and a seat. Background Art

[0002] As people's living standards improve, they have higher requirements for the functionality and comfort of modern furniture. Therefore, more and more movable mechanisms will be used in furniture, such as sliding mechanisms, rotating mechanisms, lifting mechanisms, etc.; among the existing movable mechanisms, basically both hands are required to operate, and some self-circulating mechanisms cannot achieve two-way adjustment at the same time. They can only be adjusted from the initial gear to the final gear before returning to the initial gear, which is not convenient enough.

[0003] Taking the lifting mechanism on a seat as an example, the user is often required to stand up from the seat, then open the pull-cord switch or the pull-out switch with one hand, and move the lifting mechanism with the other hand. This operation is too troublesome. Therefore, in order to simplify the operation and facilitate use, a lifting mechanism is designed. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a lifting mechanism, including a bracket, a lifting seat lifted and lowered on the bracket, and an operating rod rotatably arranged on the lifting seat. The lifting seat and the bracket are locked or unlocked by a locking piece and a locking portion. The operating rod controls the connection or separation of the locking piece and the locking portion by controlling the swinging of the swinging piece. Since the operating rod is directly arranged on the lifting seat, when the operating rod unlocks the lifting seat and the bracket, the user can adjust the height of the lifting seat by directly adjusting the height of the operating rod. Therefore, operating the operating rod to unlock and adjust the height can be done in one step and can be completed with one hand. The operation is simple and convenient to use.

[0005] A chair is further provided, comprising a lumbar support, armrests and the lifting mechanism as described above, wherein the lumbar support and the armrests are both arranged on the lifting seat, and the lumbar support and the armrests are lifted and lowered on the bracket along with the movement of the lifting seat; the lifting mechanism can realize the lifting and lowering movement of the lumbar support and the armrests at the same time, so that the lumbar support and the armrests can be adjusted together during the lifting and lowering adjustment, which is more ergonomic.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A lifting mechanism comprises a bracket, a lifting seat and an operating rod, wherein the lifting seat is slidably arranged on the bracket in a vertical direction, and the operating rod is rotatably arranged on the lifting seat; the lifting seat and the bracket are locked by a locking piece and a locking part; when the locking piece is connected to the locking part, the lifting seat and the bracket are locked, and the lifting seat and the bracket remain relatively still; when the locking part is separated from the locking piece, the lifting seat and the bracket are unlocked, and the lifting seat can slide on the bracket in a vertical direction; a synchronously rotating swinging piece is provided on the operating rod, the swinging piece is inserted in the locking piece, and the swinging piece is configured such that when the operating rod rotates, the swinging piece is driven to swing, and the swinging piece drives the locking piece to be connected or separated from the locking part.

[0008] In the lifting mechanism, the bracket is the main support and remains stationary, the lifting seat is vertically slidably arranged on the bracket, and the operating rod controls the locking and unlocking of the lifting seat and the bracket, that is, the swinging member swings with the rotation of the operating rod, and the swinging member can control the connection or separation of the locking member and the locking part while swinging, so as to realize the locking and unlocking of the lifting; and, since the operating rod is directly arranged on the lifting seat, when the operating rod unlocks the lifting seat and the bracket, the user can adjust the height of the lifting seat by directly adjusting the height of the operating rod, so the operation of the operating rod to unlock and adjust the height can be done in one step, and can be completed by one hand, which is simple to operate and convenient to use.

[0009] Preferably, the lifting seat is provided with a slide groove open toward the bracket, the locking member is slidably arranged in the slide groove, and the locking part is arranged on the bracket; the lifting seat is also provided with a first receiving groove, the swinging member arranged on the operating rod is placed in the first receiving groove, and rotates in the first receiving groove with the rotation of the operating rod; the first receiving groove is connected with the slide groove, the locking member is provided with a second receiving groove, and one end of the swinging rod is inserted in the second receiving groove. The locking member is slidably arranged in the slide groove of the lifting seat, and the locking member enters or leaves the locking part when sliding, and the swinging member is located in the first receiving groove connected with the slide groove, so that the swinging member can drive the locking member to slide in the slide groove when swinging.

[0010] Preferably, an escape space is provided on the swinging member, and a torsion spring is sleeved on the operating rod at the escape space, and two torsion spring arms of the torsion spring are respectively in contact with the groove wall of the first accommodating groove and the swinging member, and the torsion spring is configured to drive the swinging member toward the bracket. The torsion spring provides a reset function for the swinging member, that is, a reset function for the locking member to automatically engage with the locking portion. After the lifting adjustment is completed, the locking member automatically engages with the locking portion and allows the lifting seat to stay at the current height.

[0011] Preferably, one end of the swinging member is sleeved on the operating rod, and the other end of the swinging member is a round head, which is inserted into the second receiving groove. When the swinging member swings due to the manual operation of the operating rod, the round head abuts against the front side wall of the second receiving groove and drives the locking member to move forward, that is, the round head abuts against the groove wall on the side of the second receiving groove away from the bracket and drives the locking member to move away from the bracket and disengage from the locking part; when the swinging member swings due to the elastic force of the torsion spring, the round head abuts against the rear side wall of the second receiving groove and drives the locking member to move backward, that is, the round head abuts against the side wall of the second receiving groove close to the bracket and drives the locking member to approach the bracket and engage with the locking part.

[0012] Preferably, the diameter of the second receiving groove is larger than the diameter of the round head. When the swing rod swings, it contacts the groove wall of the second receiving groove by abutting, and drives the locking member to slide in the slide groove; leaving a margin to reduce the friction between the groove wall of the second receiving groove and the round head, and also reduce the possibility of motion interference.

[0013] Preferably, the locking piece is provided with three rows of locking ridges spaced apart from each other. Compared with a single locking ridge, the three rows of locking ridges are more stable during the snap-fitting.

[0014] Preferably, the locking convex strip is inclined downward. The inclined convex strip can increase the load-bearing capacity on the one hand, and make the automatic clamping smoother on the other hand.

[0015] A chair comprises a lumbar support, an armrest and the lifting mechanism as described above, wherein the lumbar support and the armrest are both arranged on the lifting seat, and the lumbar support and the armrest are lifted and lowered on the bracket along with the movement of the lifting seat. The lifting mechanism can realize the lifting and lowering movement of the lumbar support and the armrest at the same time, so that the lumbar support and the armrest can be adjusted together during the lifting and lowering adjustment, which is more ergonomic.

[0016] Preferably, the armrest includes an armrest frame and a supporting member. The armrest frame is provided with a rotation groove, which is formed by being recessed from top to bottom at the front end of the armrest frame. The supporting member is provided with a rotation column protruding downward, which is inserted into the rotation groove. The rotation column rotates in the rotation groove to drive the supporting member to rotate relative to the armrest frame. The supporting member is used to support the human arm. In this solution, the supporting member can be rotated on the armrest frame, so that the armrest can adaptively support more human arm postures.

[0017] Preferably, the lower end of the rotating column is sleeved with an elastic shift ring, which is located in the rotating groove and relatively stationary with the rotating groove. The shift ring is provided with a plurality of first shift grooves, which are arranged circumferentially; corresponding to the first shift grooves, the lower end of the rotating column is provided with a first protrusion protruding in the radial direction, which is elastically engaged with the first shift groove, and the first protrusion switches between different first shift grooves when the supporting member rotates. The shift ring is elastic, and when the first protrusion switches between different first shift grooves, the shift ring undergoes elastic deformation; the gear switching when the supporting member rotates is realized by the cooperation between the first protrusion and different first shift grooves, and the current position is maintained after the supporting member rotates.

[0018] Preferably, a radially protruding limiting portion is provided on the rotating column, and a limiting groove is provided on the gear ring. The limiting portion is located in the limiting groove. When the supporting member rotates, the limiting portion rotates in the limiting groove. The limiting portion and the limiting groove are configured to limit the rotation angle of the supporting member.

[0019] Preferably, a limit platform is provided on the groove wall at the lower end of the rotating groove, and the gear ring is radially recessed to form a matching groove. The gear ring is arranged in the rotating groove and is kept circumferentially stationary through the matching groove and the limit platform.

[0020] Preferably, the supporting member includes a frame and a sliding seat, the sliding seat is slidably arranged on the frame, the frame is provided with a gear member, the sliding seat is provided with a sliding groove, the gear member is located in the sliding groove, the gear member is provided with a second elastic protrusion, the groove wall of the sliding groove is provided with a plurality of second gear grooves, and the second gear grooves are arranged along the front-to-back direction; when the sliding seat slides on the supporting member, the second protrusion switches between different second gear grooves. The gear switching when the sliding seat slides is realized by switching the second protrusion between different second gear grooves, and the sliding seat is kept at the current position after sliding.

[0021] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0022] In the lifting mechanism, the bracket is the main support and remains stationary, the lifting seat is vertically slidably arranged on the bracket, and the operating rod controls the locking and unlocking of the lifting seat and the bracket, that is, the swinging member swings with the rotation of the operating rod, and the swinging member can control the connection or separation of the locking member and the locking part while swinging, so as to realize the locking and unlocking of the lifting; and, since the operating rod is directly arranged on the lifting seat, when the operating rod unlocks the lifting seat and the bracket, the user can adjust the height of the lifting seat by directly adjusting the height of the operating rod, so the operation of the operating rod to unlock and adjust the height can be done in one step, and can be completed by one hand, which is simple to operate and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the lifting mechanism in the embodiment of the utility model;

[0024] Figure 2 This is a front view of the lifting mechanism in the embodiment of the utility model;

[0025] Figure 3 is a cross-sectional view of the lifting mechanism in the embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the bracket in the embodiment of the utility model;

[0027] Figure 5 This is a three-dimensional structural diagram of various components installed on the lifting seat in the embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the three-dimensional structure in which the operating rod is inserted on the lifting seat in the embodiment of the utility model;

[0029] Figure 7 It is a three-dimensional structural schematic diagram of the swinging member and the locking member in the embodiment of the utility model;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of a seat in an embodiment of the present utility model;

[0031] Fig. 9 This is a schematic diagram of the three-dimensional structure of the handrail in the embodiment of the utility model;

[0032] Fig.10 It is a cross-sectional view of the handrail in the embodiment of the utility model;

[0033] Fig.11 It is an exploded view of the handrail in the embodiment of the present utility model.

[0034] The reference numerals of the figures are as follows: bracket 1; lifting seat 2; operating rod 3; locking piece 4; locking part 5; swinging piece 6; round head part 61; rotating handle 7; sliding groove 8; first accommodating groove 9; second accommodating groove 10; torsion spring 11; locking convex strip 12; locking groove 13; lumbar support 14; armrest frame 16; supporting member 17; cushion 18; frame 19; sliding seat 20; rotating groove 21; rotating column 22; gear ring 23; first gear groove 24; first protrusion 25; limiting part 26; limiting groove 27; limiting platform 28; matching groove 29; deformation part 30; gear piece 31; sliding groove 32; protrusion 33; second protrusion 34; second gear groove 35. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0037] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0038] The specific implementation of the utility model is as follows:

[0039] like Figure 1-3 As shown, the utility model provides a lifting mechanism, including a bracket 1, a lifting seat 2 and an operating rod 3, the lifting seat 2 is slidably arranged on the bracket 1 in the vertical direction, and the operating rod 3 is rotatably arranged on the lifting seat 2; the lifting seat 2 and the bracket 1 are locked by a locking member 4 and a locking portion 5 that are engaged; when the locking member 4 is engaged with the locking portion 5, the lifting seat 2 and the bracket 1 are locked, and the lifting seat 2 and the bracket 1 remain relatively stationary; when the locking portion 5 is disengaged from the locking member 4, the lifting seat 2 and the bracket 1 are unlocked, and the lifting seat 2 can slide on the bracket 1 in the vertical direction; a synchronously rotating swinging member 6 is provided on the operating rod 3, and the swinging member 6 is inserted in the locking member 4, and the swinging member 6 is configured so that when the operating rod 3 rotates, the swinging member 6 is driven to swing, and the swinging member 6 drives the locking member 4 to disengage from the locking portion 5.

[0040] In the lifting mechanism, the bracket 1 is the main support and remains stationary, the lifting seat 2 is vertically slidably arranged on the bracket 1, and the operating rod 3 controls the locking and unlocking of the lifting seat 2 and the bracket 1, that is, the swinging member 6 swings with the rotation of the operating rod 3, and the swinging member 6 can control the engagement and separation of the locking member 4 and the locking part 5 while swinging, thereby realizing the locking and unlocking of the lifting; and, since the operating rod 3 is directly arranged on the lifting seat 2, when the operating rod 3 unlocks the lifting seat 2 and the bracket 1, the user can adjust the height of the lifting seat 2 by directly adjusting the height of the operating rod 3, so the unlocking and height adjustment of the operating rod 3 can be done in one step, which can be completed with one hand, and the operation is simple and convenient to use.

[0041] like Figure 4-6As shown, the operating rod 3 is inserted on the lifting seat 2 in the left and right directions, and both ends of the operating rod 3 protrude from the lifting seat 2, and a rotating handle 7 is provided at both ends of the operating rod 3, and the user can operate the rotating handle 7 on either side to rotate the operating rod 3; a sliding groove 8 open to the bracket 1 is provided on the lifting seat 2, and the locking member 4 is slidably arranged in the sliding groove 8, and the locking portion 5 is arranged on the bracket 1; a first accommodating groove 9 is also provided on the lifting seat 2, and the swinging member 6 arranged on the operating rod 3 is placed in the first accommodating groove 9 and rotates in the first accommodating groove 9 with the rotation of the operating rod 3; the sliding groove 8 is located above the first accommodating groove 9, and the first accommodating groove 9 is connected with the sliding groove 8, and a second accommodating groove 10 is provided on the locking member 4, and one end of the swinging rod is inserted in the second accommodating groove 10; the locking member 4 is slidably arranged in the sliding groove 8 of the lifting seat, and the locking member 4 enters or leaves the locking portion 5 when sliding, and the swinging member 6 is located in the first accommodating groove 9 connected with the sliding groove 8, so that the swinging member 6 can drive the locking member 4 to slide in the sliding groove 8 when swinging.

[0042] Specifically, if Figure 7 As shown, one end of the swing member 6 is sleeved on the operating rod 3, and the other end of the swing member 6 is a round head 61 with a roughly circular cross-section. The round head 61 is inserted into the second accommodating groove 10, and the groove diameter of the second accommodating groove 10 is larger than the diameter of the round head 61; when the swing member 6 swings due to the manual operation of the operating rod 3, the round head 61 abuts against the front side wall of the second accommodating groove 10 and drives the locking member 4 to move forward, that is, the round head 61 abuts against the groove wall of the side of the second accommodating groove 10 away from the bracket 1 and drives the locking member 4 to move away from the bracket 1 and engages with the locking portion 5. Disengage the engagement; when the swinging member 6 swings due to the elastic force of the torsion spring 11, the round head portion 61 abuts against the rear side wall of the second accommodating groove 10 and drives the locking member 4 to move backward, that is, the round head portion 61 abuts against the side wall of the second accommodating groove 10 close to the bracket 1 and drives the locking member 4 close to the bracket 1 and engages with the locking portion 5; when the swinging rod swings, it contacts the groove wall of the second accommodating groove 10 by abutting, and drives the locking member 4 to slide in the sliding groove 8; leaving a margin to reduce the friction between the groove wall of the second accommodating groove 10 and the round head portion 61, and also reduce the possibility of motion interference.

[0043] Furthermore, an escape space is opened on the swing member 6, and a torsion spring 11 is sleeved on the operating rod 3 at the escape space. The two torsion spring arms of the torsion spring 11 respectively abut against the groove wall of the first accommodating groove 9 and the swing member 6. The torsion spring 11 is configured to always give the swing member 6 a force to rotate toward the bracket 1; the torsion spring 11 provides a reset function for the swing member 6, that is, it provides a reset function for the locking member 4 to automatically engage with the locking part 5. After the lifting adjustment is completed, the locking member 4 is automatically engaged with the locking part 5 and allows the lifting seat 2 to stay at the current height.

[0044] The locking member 4 is provided with three rows of locking ridges 12 arranged at intervals in the upper and lower parts. The locking ridges 12 are inclined downward and the length of the locking ridges 12 is 60-70 mm. In this embodiment, the length of the locking ridges 12 is 68 mm. Correspondingly, the locking portion 5 is provided with a plurality of locking grooves 13. The locking grooves 13 are arranged at intervals in the vertical direction. The locking ridges 12 enter the locking grooves 13 to achieve the clamping of the locking member 4 and the locking portion 5. There are three rows of locking ridges 12. Compared with a single locking ridge 12, this solution is more stable during the clamping fit. The ridges are inclined, which can increase the load-bearing capacity on the one hand and make the automatic clamping smoother on the other hand. Compared with the commonly used locking teeth, the length of the ridges is longer, which further increases the load-bearing capacity and stability.

[0045] A seat is provided, such as Figure 8 As shown, the waist support 14, the armrests and the lifting mechanism as described above are included, the waist support 14 and the armrests are both arranged on the lifting seat 2, and the waist support 14 and the armrests are lifted and lowered on the bracket 1 along with the movement of the lifting seat 2. The lifting mechanism can realize the lifting and lowering movement of the waist support 14 and the armrests at the same time, so that the waist support 14 and the armrests can be adjusted together during the lifting and lowering adjustment, which is more ergonomic.

[0046] like Figure 9-11 As shown, the armrest includes an armrest frame 16 and a supporting member 17, the armrest frame 16 is connected to the lifting seat 2, the supporting member 17 is rotatably set on the armrest frame 16 and is used to support the human arm; the supporting member 17 includes a cushion 18, a frame 19 and a sliding seat 20, the frame 19 is rotatably set on the armrest frame 16, the sliding seat 20 is slidably set on the frame 19 back and forth, and the cushion 18 is installed on the sliding seat 20; combined with the lifting mechanism, the armrest can be lifted, rotated and adjusted back and forth when supporting the human arm, thereby realizing multi-dimensional adjustment of the armrest.

[0047] Specifically, a rotation groove 21 is provided on the armrest frame 16, and the rotation groove 21 is formed by being recessed from top to bottom at the front end of the armrest frame 16. A rotation column 22 is protruded downwardly from the supporting member 17, and the rotation column 22 is inserted into the rotation groove 21. The rotation of the rotation column 22 in the rotation groove 21 drives the supporting member 17 to rotate relative to the armrest frame 16; the rotation column 22 is located on the frame 19; the supporting member 17 is used to support the human arm. In this solution, the rotation of the supporting member 17 on the armrest frame 16 can be realized, so that the armrest can adaptively support more human arm postures.

[0048] Furthermore, an elastic shift ring 23 is sleeved on the lower end of the rotating column 22. The shift ring 23 is located in the rotating groove 21 and is relatively stationary with the rotating groove 21. A plurality of first shift grooves 24 are provided on the shift ring 23. The first shift grooves 24 are arranged along the circumferential direction. Corresponding to the first shift grooves 24, a first protrusion 25 protruding in the radial direction is provided on the lower end of the rotating column 22. The first protrusion 25 is elastically engaged with the first shift groove 24. When the supporting member 17 rotates, the first protrusion 25 switches between different first shift grooves 24. The rotating column 22 is also provided with a radially protruding A limiting portion 26 and a limiting groove 27 are provided on the shift ring 23, and the limiting portion 26 is located in the limiting groove 27. When the supporting member 17 rotates, the limiting portion 26 rotates in the limiting groove 27. The limiting portion 26 and the limiting groove 27 are configured to limit the rotation angle of the supporting member 17; the shift ring 23 is elastic, and when the first protrusion 25 switches between different first gear grooves 24, the shift ring 23 undergoes elastic deformation; the gear switching when the supporting member 17 rotates is achieved by the cooperation of the first protrusion 25 and the different first gear grooves 24, and the current position is maintained after the supporting member 17 rotates.

[0049] A limit platform 28 is provided on the groove wall at the lower end of the rotating groove 21, and the gear ring 23 is radially recessed to form a matching groove 29. The gear ring 23 is arranged in the rotating groove 21 and maintains circumferential stillness with the limit platform 28 through the matching groove 29; a deformation part 30 is provided on the side of the first first gear groove 24 and the side of the last first gear groove 24. The deformation part 30 is bent to further generate a gap between the limit platform 28 and the first gear groove 24, thereby ensuring that when the gear is switched, the deformation ability of the gear ring 23 is sufficient to allow the first protrusion 25 to switch between different first gear grooves 24.

[0050] Furthermore, a shift piece 31 is provided on the framework 19, and a sliding groove 32 is provided on the sliding seat 20. A convex portion 33 is convexed inwardly at the lower part of the sliding groove 32. The shift piece 31 is located in the sliding groove 32 and is installed above the convex portion 33 from top to bottom, and the convex portion 33 is restricted between the shift piece 31 and the framework 19; a second elastic protrusion 34 is provided on the shift piece 31, and the middle part of the shift piece 31 is hollow to make the second protrusion 34 elastic; the shift piece 31 and the framework 19 remain relatively still, there are two second protrusions 34, which are symmetrically arranged on the shift piece 31, and a plurality of second gear grooves 35 are correspondingly opened on the two groove walls of the sliding groove 32, and the second gear grooves 35 are arranged along the front-to-back direction; when the sliding seat 20 slides on the supporting member 17, the second protrusion 34 switches between different second gear grooves 35; the gear switching when the sliding seat 20 slides is realized by switching the second protrusion 34 between different second gear grooves 35, and the sliding seat 20 remains in the current position after sliding.

Claims

1. A lifting mechanism, characterized in that: The invention comprises a bracket, a lifting seat and an operating rod, wherein the lifting seat is slidably arranged on the bracket in a vertical direction, and the operating rod is rotatably arranged on the lifting seat; the lifting seat and the bracket are locked by a locking piece and a locking part; when the locking piece is connected to the locking part, the lifting seat and the bracket are locked, and the lifting seat and the bracket remain relatively still; when the locking part is separated from the locking piece, the lifting seat and the bracket are unlocked, and the lifting seat can slide on the bracket in a vertical direction; a synchronously rotating swinging piece is provided on the operating rod, and the swinging piece is inserted in the locking piece, and the swinging piece is configured as follows: when the operating rod rotates, the swinging piece is driven to swing, and the swinging piece drives the locking piece to be connected or separated from the locking part.

2. The lifting mechanism according to claim 1, characterized in that: The lifting seat is provided with a slide groove open toward the bracket, the locking piece is slidably arranged in the slide groove, and the locking part is arranged on the bracket; the lifting seat is also provided with a first accommodating groove, the swinging piece arranged on the operating rod is placed in the first accommodating groove, and rotates in the first accommodating groove with the rotation of the operating rod; the first accommodating groove is connected with the slide groove, the locking piece is provided with a second accommodating groove, and one end of the swinging rod is inserted in the second accommodating groove.

3. The lifting mechanism according to claim 2, characterized in that: An escape space is provided on the swinging member, and a torsion spring is sleeved on the operating rod at the escape space. Two torsion spring arms of the torsion spring respectively abut against the groove wall of the first accommodating groove and the swinging member, and the torsion spring is configured to drive the swinging member toward the bracket.

4. The lifting mechanism according to claim 2, characterized in that: One end of the swinging member is sleeved on the operating rod, and the other end of the swinging member is a round head portion, which is inserted into the second accommodating groove.

5. The lifting mechanism according to claim 4, characterized in that: The diameter of the second accommodating groove is greater than the diameter of the round head portion.

6. The lifting mechanism according to claim 1, characterized in that: The locking piece is provided with three rows of locking convex strips which are arranged at intervals up and down.

7. The lifting mechanism according to claim 6, characterized in that: The locking rib is inclined diagonally downward.

8. A seat, characterized in that: It comprises a waist support, an armrest and a lifting mechanism as claimed in any one of claims 1 to 7, wherein the waist support and the armrest are both arranged on the lifting seat, and the waist support and the armrest are lifted and lowered on the bracket along with the movement of the lifting seat.

9. The seat according to claim 8, characterized in that: The handrail includes an handrail frame and a supporting member. The handrail frame is provided with a rotating groove, which is formed by being recessed from top to bottom at the front end of the handrail frame. The supporting member is provided with a rotating column protruding downward, and the rotating column is inserted in the rotating groove. The rotating column rotates in the rotating groove to drive the supporting member to rotate relative to the handrail frame.

10. The seat according to claim 9, characterized in that: An elastic gear ring is sleeved on the lower end of the rotating column. The gear ring is located in the rotating groove and is relatively stationary with the rotating groove. A plurality of first gear grooves are provided on the gear ring, and the first gear grooves are arranged along the circumferential direction. Corresponding to the corresponding first gear grooves, a first protrusion protruding along the radial direction is provided on the lower end of the rotating column. The first protrusion is elastically engaged with the first gear groove, and when the supporting member rotates, the first protrusion switches between different first gear grooves.

11. The seat according to claim 10, characterized in that: A radially protruding limiting portion is also provided on the rotating column, and a limiting groove is provided on the gear ring. The limiting portion is located in the limiting groove. When the supporting member rotates, the limiting portion rotates in the limiting groove. The limiting portion and the limiting groove are configured to limit the rotation angle of the supporting member.

12. The seat according to claim 10, characterized in that: A limit platform is arranged on the groove wall at the lower end of the rotating groove, and a matching groove is formed in the radial direction of the gear ring. The gear ring is arranged in the rotating groove and keeps circumferential stillness through the matching groove and the limit platform.

13. The seat according to claim 9, characterized in that: The supporting member includes a frame and a sliding seat. The sliding seat is slidably arranged on the frame forward and backward. A gear member is provided on the frame. A sliding groove is provided on the sliding seat. The gear member is located in the sliding groove. A second elastic protrusion is provided on the gear member. A plurality of second gear grooves are opened on the groove wall of the sliding groove. The second gear grooves are arranged along the front-to-back direction. When the sliding seat slides on the supporting member, the second protrusion switches between different second gear grooves.

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