Lifting mechanism and lifting chair

Abstract

The utility model belongs to the technical field of lifting chairs, and particularly relates to a lifting mechanism and a lifting chair, the lifting mechanism comprises a lifting assembly for the lifting chair, the lifting assembly for the lifting chair comprises a first lifting supporting leg, the side of the first lifting supporting leg is rotatably connected with a height adjusting handle, the end part of the height adjusting handle is integrally connected with a transmission worm, and the transmission worm is connected with a transmission shaft. The other end of the transmission worm is integrally connected with a supporting rotating shaft, the side of the transmission worm is meshed with a transmission worm gear, a first bearing is arranged at the bottom of the transmission worm gear, and the inner wall of the transmission worm gear is integrally connected with a lifting lead screw. The lifting of the seat is realized by utilizing the transmission of the worm gear and the worm and the matching of the lead screw structure, the stability is higher, the use is convenient, and meanwhile, the backrest adjusting assembly is convenient to adjust according to users with different body types, so that the supporting force can be provided for the waist of the user, and the comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lift chairs, in particular to a lift mechanism and a lift chair. Background Art

[0002] A lift chair is a chair commonly used in daily work and life. It is mainly composed of a seat, a backrest, a bracket, a rocker arm, a lifting and positioning device and a chair leg. The bracket and the chair leg are correspondingly hinged by a rocker arm. The rocker arm rotates up and down with the hinge axis hinged on the chair leg as the center. When the rocker arm is shaken, the bracket is driven to rise and fall, thereby realizing the lifting and lowering of the seat. In addition, a lifting and positioning device is usually provided between the bracket and the chair leg.

[0003] The patent with application number CN202220759096.X records a pneumatically assisted lifting chair, which includes a seat body, a base arranged at the lower end of the seat body, a lifter for connecting the seat body and the base, and an adjustment mechanism for adjusting the comfort between the lifter and the seat body. The lifter has a fixed plate, and the adjustment mechanism is installed on the fixed plate. The adjustment mechanism consists of an annular member, a hinge, a connecting member, and a plurality of movable cylinders. The connecting member is fixed to the lower end of the seat body by screws, and the lower end of the connecting member has a sleeve that cooperates with the movable cylinder, and the middle of the hinge is hinged on the ear of the annular member. The pneumatically assisted lifting chair can adjust the comfort between the seat body and the lifter through the adjustment mechanism, change the structural relationship between the seat body and the lifter, so that it is no longer a rigid connection, but can adjust the compression state of the spring according to the needs of the user, thereby achieving different comfort effects, effectively improving the practicality of the lifter when in use.

[0004] Most of the existing lifting chairs use pneumatic structures to achieve the lifting of the chair seat. However, pneumatic lifting chairs have certain safety hazards. Frequent lifting and rotation of pneumatic lifting chairs can easily lead to overheating and explosion. After long-term use, the sealing ring of the throttle valve is prone to aging, resulting in air leakage, affecting normal lifting operations. In addition, the backrest of the existing lifting chair is usually provided with a fixed curvature to support the waist of the person. However, due to the differences in each person's body shape, the backrest of these lifting chairs is difficult to support the waist of each user. When using it, some people's waists cannot get strong support, and long-term use is likely to cause waist discomfort. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a lifting mechanism with a smooth, stable and safe lifting process and a lifting chair that is convenient for improving the comfort of users.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] A lifting mechanism, which includes a lifting assembly for a lifting chair, the lifting assembly for a lifting chair includes a first lifting leg, the side of the first lifting leg is rotatably connected to a height adjustment handle, the end of the height adjustment handle is connected to a transmission worm, the other end of the transmission worm is connected to a supporting shaft, the side of the transmission worm is meshed with a transmission worm wheel, the bottom of the transmission worm wheel is provided with a first bearing, the inner wall of the transmission worm wheel is integrally connected with a lifting screw, the upper part of the transmission worm wheel is provided with a lifting nut, the top of the lifting screw is interference connected with a second bearing, the outside of the second bearing is fixedly connected with a lifting block, a limiting slider is provided on one side of the lifting block, the outside of the limiting slider is slidably connected to a limiting slide groove, and the outside of the limiting slide groove is integrally connected with the second lifting leg.

[0008] Furthermore, the lifting screw rod forms a rotating structure with the lifting block through the second bearing, and the lifting block forms a sliding structure with the second lifting leg through the limiting slider, the limiting slide groove, and the second lifting leg, and the second lifting leg and the lifting nut are fixedly connected; the second lifting leg forms a lifting structure with the lifting screw rod through the lifting nut; the transmission worm rod forms a rotating structure with the first lifting leg through the supporting shaft, and the transmission worm rod forms a transmission structure with the lifting screw rod through the transmission worm wheel; the bottom end of the lifting screw rod and the first bearing are interference connected, and the lifting screw rod forms a rotating structure with the first lifting leg through the first bearing.

[0009] A lifting chair, which includes the lifting mechanism described above, and also includes a movable bottom plate arranged at the bottom end of a lifting assembly for the lifting chair, a rotating assembly is installed on the top of the lifting assembly for the lifting chair, a lifting chair seat plate is fixedly connected to the top of the rotating assembly, a lifting chair backrest is fixedly connected to the top of the lifting chair seat plate, a backrest adjustment assembly is installed on the back of the lifting chair backrest, the backrest adjustment assembly includes a supporting cross bar, an adjusting screw is threadedly connected to the inner part of the supporting cross bar, a rotating disc is integrally connected to the end of the adjusting screw, the outer part of the rotating disc is rotatably connected to a fixed ring, and a back adjustment support block is fixedly connected to the side of the fixed ring.

[0010] Furthermore, the adjusting screw rod forms a rotating structure through a rotating disc, a fixed ring and a back adjusting support block, and the back adjusting support block and the lifting chair backrest are integrated.

[0011] Furthermore, the rotating assembly comprises an angle-adjusting rotating drum, the interior of the angle-adjusting rotating drum is rotatably connected to an angle-adjusting rotating shaft, and the outer wall of the angle-adjusting rotating drum is fixedly connected to a reinforcing support rod.

[0012] Furthermore, the longitudinal section shape of the reinforcement support rod is set to a right triangle, and the reinforcement support rod is at the same angle with respect to the vertical center axis of the angle adjustment drum. The angle adjustment drum forms a rotating structure with the second lifting leg through the angle adjustment shaft.

[0013] The beneficial effects of the utility model are:

[0014] 1. The present application is provided with a lifting assembly for a lifting chair, which utilizes a transmission worm and a transmission worm wheel to cooperate with each other, and can rotate the lifting screw by rotating the height adjustment handle, and utilizes the worm wheel and the worm wheel to cooperate with each other, and there is no need to add a limit mechanism, and the transmission worm wheel cannot reversely rotate the transmission worm, thereby ensuring that when the seat is lifted to a certain height, it will not automatically slide down even if the seat is stressed. The lifting screw and the lifting nut form a screw structure, and the lifting is completed by the screw structure, and the lifting process is smoother and more stable, and the structure is simple and easy to operate;

[0015] 2. The present application is provided with a backrest adjustment assembly. By turning the adjustment screw, the end of the screw moves forward and backward with the back adjustment support block, and then bends and adjusts against the middle position of the lift chair backrest, so that the lift chair backrest of the chair can be against the user's waist position, providing a support force for the user's waist, thereby improving the user's comfort;

[0016] 3. The present application is provided with a rotating assembly, and four reinforced support rods can enhance the support for the lifting chair seat plate, thereby improving the stability and service life of the chair. The angle adjustment cylinder and the angle adjustment shaft cooperate with each other, and the user can freely rotate and adjust the chair when sitting on the lifting chair, which is more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model as a whole from the side;

[0018] Figure 2 This is a schematic diagram of the internal structure of the lifting assembly part of the lifting chair of the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the lifting nut part of the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the backrest adjustment component of the utility model;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the rotating component part of the utility model.

[0022] In the figure: 1. movable bottom plate; 2. lifting assembly for lifting chair; 3. rotating assembly; 4. lifting chair seat plate; 5. lifting chair backrest; 6. backrest adjustment assembly; 201. first lifting leg; 202. height adjustment handle; 203. transmission worm; 204. supporting shaft; 205. transmission worm gear; 206. first bearing; 207. lifting screw; 208. lifting nut; 209. second bearing; 210. lifting block; 211. limiting slider; 212. limiting slide; 213. second lifting leg; 301. angle adjustment drum; 302. angle adjustment shaft; 303. reinforcement support rod; 601. supporting cross bar; 602. adjusting screw; 603. rotating disc; 604. fixing ring; 605. back adjustment support block. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1: Figure 2 As shown, a lifting mechanism includes a lifting component 2 for a lifting chair, and the lifting component 2 for a lifting chair includes a first lifting leg 201, and the side of the first lifting leg 201 is rotatably connected to a height adjustment handle 202, the end of the height adjustment handle 202 is integrally connected to a transmission worm 203, and the other end of the transmission worm 203 is integrally connected to a support shaft 204, and the side of the transmission worm 203 is meshed with a transmission worm wheel 205, and the bottom of the transmission worm wheel 205 is provided with a first bearing 206, and the inner wall of the transmission worm wheel 205 is integrally connected to a lifting screw 207, and the upper part of the transmission worm wheel 205 is provided with a lifting nut 208, and the top of the lifting screw 207 is interference-connected with a second bearing 209, and the outside of the second bearing 209 is fixedly connected with a lifting block 210, and a limiting slider 211 is provided on one side of the lifting block 210, and the outside of the limiting slider 211 is slidably connected to a limiting slide groove 212, and the outside of the limiting slide groove 212 is integrally connected with a second lifting leg 213.

[0025] like Figure 2 , Figure 3As shown, the lifting screw 207 forms a rotating structure with the lifting block 210 through the second bearing 209, and the lifting block 210 forms a sliding structure with the second lifting leg 213 through the limiting slider 211 and the limiting slide groove 212; the second lifting leg 213 is fixedly connected to the lifting nut 208, and the second lifting leg 213 forms a lifting structure with the lifting screw 207 through the lifting nut 208, the transmission worm 203 forms a rotating structure with the first lifting leg 201 through the supporting shaft 204, and the transmission worm 203 forms a transmission structure with the lifting screw 207 through the transmission worm wheel 205; there is a The interference fit connection is used, and the lifting screw 207 forms a rotating structure with the first lifting leg 201 through the first bearing 206; the cooperation between the transmission worm 203 and the transmission worm wheel 205 is used to facilitate the rotation of the lifting screw 207 by rotating the height adjustment handle 202, and the worm wheel and worm cooperate with each other, and there is no need to add a limiting mechanism. The transmission worm wheel 205 cannot rotate the transmission worm 203 in the opposite direction, ensuring that when it is lifted to a certain height, even if the seat is subjected to force, it will not automatically slide down; the lifting screw 207 and the lifting nut 208 form a screw structure, and the screw structure is used to complete the lifting, and the lifting process is smoother and more stable, with a simple structure and convenient operation.

[0026] Embodiment 2: Figure 1 As shown, a lifting chair comprises the lifting mechanism described in Example 1, and also comprises a movable bottom plate 1 arranged at the bottom end of a lifting component 2 for the lifting chair, a rotating component 3 is installed on the top of the lifting component 2 for the lifting chair, a lifting chair seat plate 4 is fixedly connected to the top of the rotating component 3, a lifting chair backrest 5 is fixedly connected to the top of the lifting chair seat plate 4, and a backrest adjustment component 6 is installed on the back of the lifting chair backrest 5.

[0027] like Figure 4 As shown, the backrest adjustment component 6 includes a supporting cross bar 601, the internal thread of the supporting cross bar 601 is connected with an adjusting screw 602, the end of the adjusting screw 602 is integrally connected with a rotating disc 603, the outer rotation of the rotating disc 603 is connected with a fixed ring 604, the side of the fixed ring 604 is fixedly connected with a back adjustment support block 605, the adjusting screw 602 forms a rotating structure through the rotating disc 603, the fixed ring 604 and the back adjustment support block 605, and the back adjustment support block 605 is integrated with the lifting chair backrest 5; by twisting the adjusting screw 602, its end can move back and forth with the back adjustment support block 605 to bend and adjust the middle position of the lifting chair backrest 5, so that the lifting chair backrest 5 of this chair can resist the user's waist position, provide a supporting force for the user's waist, and facilitate improving the user's comfort.

[0028] like Figure 5As shown, the rotating component 3 includes an angle adjustment cylinder 301, the internal rotation of the angle adjustment cylinder 301 is connected to the angle adjustment shaft 302, the outer wall of the angle adjustment cylinder 301 is fixedly connected to the reinforcement support rod 303, the longitudinal section shape of the reinforcement support rod 303 is set to a right triangle, the reinforcement support rod 303 is at an equal angle with respect to the vertical center axis of the angle adjustment cylinder 301, the angle adjustment cylinder 301 forms a rotating structure with the second lifting leg 213 through the angle adjustment shaft 302, the four reinforcement support rods 303 are convenient for enhancing the support for the lifting chair seat plate 4, and for improving the stability and service life of this chair, the angle adjustment cylinder 301 and the angle adjustment shaft 302 cooperate with each other, and the user can freely rotate and adjust when sitting on this lifting chair, which is more flexible and convenient.

[0029] Working principle: when the height of the lifting chair needs to be adjusted, it is only necessary to rotate the height adjustment handle 202, and the height adjustment handle 202 rotates with the transmission worm 203. Since the transmission worm 203 and the transmission worm wheel 205 are meshed with each other, the transmission worm 203 can rotate with the lifting screw 207 through the transmission worm wheel 205; when the lifting screw 207 rotates, since the lifting nut 208 cannot rotate with the lifting screw 207, and a ball is provided between the threads that fit the two, the lifting nut 208 will move up and down on the outside of the lifting screw 207, and then move up and down with the second lifting leg 213, and then lift the lifting chair seat plate 4 and the lifting chair backrest 5 on the top thereof for lifting and lowering adjustment. If you want to control the rise or fall, you only need to change the rotation direction of the height adjustment handle 202;

[0030] When the user sits on the lift seat plate 4 of this chair and the lift backrest 5 cannot support the user's back and waist, the user can rotate the adjusting screw 602, and the end of the adjusting screw 602 rotates inside the fixed ring 604 with the rotating disc 603. Since the adjusting screw 602 and the supporting cross bar 601 are threadedly connected, when the adjusting screw 602 is rotated, the distance between the end and the supporting cross bar 601 will change, and the end of the adjusting screw 602 can move forward or backward with the back adjustment support block 605. Since the lift backrest 5 is composed of a circle of flexible plastic on the outside supporting a layer of mesh breathable fabric on the inside, the back adjustment support block 605 can bend forward or backward with the lift backrest 5, so that the middle position of the lift backrest 5 is against the user's waist, providing support for the user's waist, and when the user sits on the lift seat plate 4, the angle can be freely adjusted through the angle adjustment drum 301 and the angle adjustment shaft 302.

[0031] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments, and that the utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A lifting mechanism, characterized in that: The invention comprises a lifting assembly (2) for a lifting chair, wherein the lifting assembly (2) for a lifting chair comprises a first lifting leg (201), the side of the first lifting leg (201) is rotatably connected to a height adjustment handle (202), the end of the height adjustment handle (202) is connected to a transmission worm (203), and the other end of the transmission worm (203) is connected to a support shaft (204); the side of the transmission worm (203) is meshed with a transmission worm wheel (205), the bottom of the transmission worm wheel (205) is provided with a first bearing (206), and the transmission worm wheel (205) is provided with a first bearing (206). 05) is integrally connected with a lifting screw (207), a lifting nut (208) is arranged on the upper part of the transmission worm wheel (205), the top end of the lifting screw (207) is interference-connected with a second bearing (209), the outside of the second bearing (209) is fixedly connected with a lifting block (210), a limiting slider (211) is arranged on one side of the lifting block (210), the outside of the limiting slider (211) is slidably connected with a limiting slot (212), and the outside of the limiting slot (212) is integrally connected with a second lifting leg (213).

2. A lifting mechanism according to claim 1, characterized in that: The lifting screw rod (207) forms a rotating structure with the lifting block (210) through the second bearing (209), and the lifting block (210) forms a sliding structure with the limiting sliding block (211), the limiting sliding groove (212) and the second lifting leg (213).

3. A lifting mechanism according to claim 2, characterized in that: The second lifting leg (213) and the lifting nut (208) are fixedly connected, and the second lifting leg (213) forms a lifting structure through the lifting nut (208) and the lifting screw rod (207).

4. A lifting mechanism according to claim 1, characterized in that: The transmission worm (203) forms a rotating structure with the first lifting leg (201) through the supporting rotating shaft (204), and the transmission worm (203) forms a transmission structure with the lifting screw (207) through the transmission worm wheel (205).

5. A lifting mechanism according to claim 4, characterized in that: The bottom end of the lifting screw rod (207) and the first bearing (206) are in interference connection, and the lifting screw rod (207) forms a rotating structure with the first lifting leg (201) through the first bearing (206).

6. A lifting chair, characterized in that: The invention comprises the lifting mechanism described in any one of claims 1 to 5.

7. The lifting chair according to claim 6, characterized in that: It also comprises a movable bottom plate (1) arranged at the bottom end of a lifting assembly (2) for a lifting chair, a rotating assembly (3) is installed on the top of the lifting assembly (2) for the lifting chair, a lifting chair seat plate (4) is fixedly connected to the top of the rotating assembly (3), a lifting chair backrest (5) is fixedly connected to the top of the lifting chair seat plate (4), and a backrest adjustment assembly (6) is installed on the back of the lifting chair backrest (5); The backrest adjustment assembly (6) comprises a supporting cross bar (601), the internal thread of the supporting cross bar (601) is connected to an adjusting screw (602), the end of the adjusting screw (602) is integrally connected to a rotating disc (603), the external rotation of the rotating disc (603) is connected to a fixed ring (604), and the side of the fixed ring (604) is fixedly connected to a back adjustment support block (605).

8. The lifting chair according to claim 7, characterized in that: The adjusting screw (602) forms a rotating structure through a rotating disc (603), a fixed ring (604) and a back adjusting support block (605), and the back adjusting support block (605) and the lifting chair backrest (5) are integrated.

9. The lifting chair according to claim 7, characterized in that: The rotating assembly (3) comprises an angle adjustment rotating drum (301), the interior of the angle adjustment rotating drum (301) is rotatably connected to an angle adjustment rotating shaft (302), and the outer wall of the angle adjustment rotating drum (301) is fixedly connected to a reinforcement support rod (303).

10. A lifting chair according to claim 9, characterized in that: The longitudinal section of the reinforcement support rod (303) is set to a right triangle, and the reinforcement support rod (303) is at the same angle as the vertical center axis of the angle adjustment rotating drum (301). The angle adjustment rotating drum (301) forms a rotating structure with the second lifting leg (213) through the angle adjustment rotating shaft (302).

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