CN221801194U - Lifting mechanism and self-locking lifting support - Google Patents

Abstract

The utility model discloses a lifting mechanism and a self-locking lifting bracket, wherein the lifting mechanism comprises a pipe body assembly and a driving mechanism connected with the pipe body assembly, the driving mechanism comprises a gear transmission assembly, a screw rod nut assembly and a handle, the connecting mode of the handle and the gear transmission assembly is designed in the scheme, the movable connecting structure can axially slide while restraining circumferential movement, a limiting hole is formed at the pipe body where the gear transmission assembly is positioned, the handle can be forced to rotate during use, the corresponding gear in the gear transmission assembly is driven to rotate, the corresponding pipe body is lifted under the transmission cooperation of the screw rod nut assembly, the handle can be slid to insert the head end part of the handle into the limiting hole after the lifting mechanism is lifted to a preset position, the rotation of the head end part is restrained by the limiting hole, and the synchronous restraining handle forms locking, so that the position of the corresponding lifting pipe body is more stable.

Description

Lifting mechanism and self-locking lifting bracket

Technical Field

The utility model relates to the technical field of lifting devices, in particular to a lifting mechanism and a self-locking lifting bracket comprising the lifting mechanism.

Background Art

The lifting table is a commonly used tool at home or at work. It is generally composed of a base, a lifting mechanism, and a mounting frame. The LCD screen is fixed on the mounting frame, and the mounting frame is raised and lowered by the lifting mechanism to adjust the height of the screen. Some lifting mechanisms are hand-cranked, connected to the driving mechanism in the lifting mechanism by a handle. The corresponding tube body is raised or lowered by turning the handle under the transmission of the gear transmission assembly, the screw assembly, etc. in the lifting mechanism. The screw and nut in the screw assembly must meet certain conditions to achieve self-locking, such as the lead angle requirements. When the self-locking conditions cannot be met, the lifting mechanism will drop by itself under the gravity of the object carried by the mounting frame, which needs to be improved.

Utility Model Content

In order to solve at least one of the above technical defects, the utility model provides the following technical solutions:

The first aspect of the present application document discloses a lifting mechanism, which includes a tube body assembly and a driving mechanism connected to the tube body assembly, wherein the driving mechanism includes a gear transmission assembly, a screw nut assembly, and a handle, wherein the gear transmission assembly is arranged on the tube body assembly, and the handle is connected to the gear transmission assembly, and the corresponding tube body in the tube body assembly is driven to rise and fall by the handle under the transmission cooperation of the gear transmission assembly and the screw nut assembly, and the handle and the gear transmission assembly are dynamically connected, and a limiting hole that is plug-in and cooperated with the head end of the handle is arranged at the gear transmission assembly or at the tube wall on the tube body along the sliding direction of the handle, and when the head end of the handle is inserted into the limiting hole, the limiting hole limits the self-rotation of the handle.

In this solution, a connection form between the handle and the gear transmission assembly is designed, and a dynamic connection structure is used. The handle can slide axially while constraining circumferential movement, and a limiting hole is formed at the tube body where the gear transmission assembly is located. When in use, force can be applied to rotate the handle, thereby driving the corresponding gear in the gear transmission assembly to rotate, and the corresponding tube body is lifted and lowered under the transmission cooperation of the screw nut assembly. After lifting to the predetermined position, the handle can be slid to insert its head end into the limiting hole, and the limiting hole is used to constrain the self-rotation of the head end, and the handle is synchronously constrained to form a lock, so that the position of the corresponding lifting tube body is more stable.

Furthermore, the limiting hole is a polygonal hole type, and the head end of the handle is a polygonal column type. When the polygonal column is inserted into the polygonal hole, the rotation of the polygonal column is limited by the hole wall of the polygonal hole.

Furthermore, a plurality of V-shaped grooves are continuously distributed along the circumference on the hole wall of the limiting hole to facilitate the insertion of polygonal columns of different models.

Furthermore, the gear transmission assembly includes a gear box and bevel gear 1 and bevel gear 2 that match each other in its cavity. Bevel gear 1 is vertically arranged and rotatably connected to the gear box, bevel gear 2 is horizontally arranged and rotatably connected to the gear box, and bevel gear 1 is concentrically connected to the handle and the two are dynamically connected.

Furthermore, a polygonal through hole is axially arranged at the center of the bevel gear one, and the handle part which is plugged into and matched with the through hole is a corresponding polygonal column. The polygonal column is inserted into the polygonal through hole to constrain the circumferential movement, and the handle can synchronously slide axially relative to the through hole to meet the usage requirements.

Furthermore, the screw-nut assembly comprises a screw and a nut matched therewith, and the screw is fixed concentrically with the bevel gear.

Furthermore, the tube body assembly comprises an inner tube and an outer tube which fit together, a nut is fixed in the cavity of the outer tube and the inner tube is fixed to the gear box.

The second aspect of the present application document discloses a self-locking lifting bracket, including the lifting mechanism described in any of the above items, wherein a mounting frame is arranged at the movable end of the lifting mechanism, the lifting mechanism is fixed on a base, and a LCD screen is fixed by the mounting frame, and a base is added to facilitate placement and improve stability.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model improves the connection structure of the handle, and the handle can be axially slidable and inserted into the limit hole to limit rotation, thereby realizing the locking of the lifting mechanism and improving stability.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the overall structure of the self-locking lifting bracket in Example 1;

FIG2 is a schematic cross-sectional view of the structure of FIG1 ;

Fig. 3 is a schematic diagram of the enlarged structure of part A;

Fig. 4 is a schematic diagram of the enlarged structure of part B;

FIG5 is a schematic diagram of the structure of the limiting hole;

Wherein, the accompanying drawings are marked as follows:

1. Mounting frame; 2. Lifting mechanism; 3. Base; 201. Inner tube; 202. Outer tube; 203. Support tube; 204. Gear box; 205. Handle; 206. Bevel gear one; 207. Limiting hole; 208. Bevel gear two; 209. Screw; 210. Nut; 211. V-groove.

DETAILED DESCRIPTION

The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1 to 5, in this example, the self-locking lifting bracket includes a lifting mechanism 2, a mounting frame 1, and a base 3. The lifting mechanism 2 is fixed on the base 3, and the mounting frame 1 is fixed at the moving end of the lifting mechanism 2. The base is added to facilitate the placement of the bracket. The mounting frame can be freely selected from the configurations disclosed in the market according to needs, and is mainly used to fix the LCD screen.

In this example, the lifting mechanism 2 includes a tube body assembly and a driving mechanism connected to the tube body assembly, wherein the driving mechanism includes a gear transmission assembly, a screw nut assembly, and a handle 205. The tube body assembly includes an inner tube 201 and an outer tube 202. The outer tube 202 is sleeved on the inner tube 201 and the two are slidably matched. The outer tube 202 is fixed on the base 3, and the mounting frame 1 is fixed at the head end of the inner tube 201.

The gear transmission assembly is installed on the inner tube 201 in the tube body assembly. The handle 205 is connected to the screw nut assembly by the gear transmission assembly. The gear transmission assembly is operated by rotating the handle, and then the screw nut assembly is operated, and then the corresponding tube in the tube body assembly is driven to rise and fall. In this example, the head end of the handle 205 and the gear transmission assembly are dynamically connected, that is, the handle can slide axially while constraining circumferential movement. As shown in Figure 3, the gear transmission assembly includes a gear box 204 and bevel gears 1 206 and 208 that match each other in its cavity. The gear box 204 is fixed in the head end cavity of the inner tube 201, the bevel gear 1 206 is vertically arranged in the cavity and is rotatably connected to the side wall of the gear box through bearings, etc., the bevel gear 208 is horizontally arranged and is rotatably connected to the bottom wall of the gear box through bearings, etc., the bevel gear 1 206 is concentrically connected to the handle 205 and the two are dynamically connected, a limiting hole 207 is formed at the side wall opposite to the bevel gear 1 206, or a limiting hole is formed at the wall of the inner tube and a hole for the head end of the handle to pass through is formed at the side wall of the gear box corresponding to the limiting hole, so that the limiting hole is plug-fitted with the head end of the handle and constrains its rotation.

The dynamic connection structure can be freely selected according to public technology or common sense, such as a multi-sided through hole, such as a hexagonal hole, formed axially at the center of the bevel gear 206. In the state shown in Figure 3, the right side part of the handle 205 is in the shape of a hexagonal prism. In the initial state, the right side part of the handle 205 is inserted into the through hole and the clearance fits. Rotating the handle can synchronously drive the bevel gear 1 to rotate, and the handle can be axially slid relative to the bevel gear 1 so that the head end of the handle on the right side is exposed from the through hole and inserted into the limiting hole 207. The limiting hole is consistent with the through hole structure and is also a hexagonal hole shape. The hexagonal head end of the handle is inserted into the limiting hole and the clearance fits. The self-rotation of the head end of the handle is limited by the limiting hole, and the rotation of the entire handle is synchronously limited, thereby locking the lifting mechanism.

In addition, a circular hole can be formed axially at the center of the bevel gear one and a groove can be formed axially on the hole wall, and a convex ridge can be formed on the peripheral wall of the corresponding handle part. The cooperation between the convex ridge and the groove enables the bevel gear one and the handle to rotate synchronously and the handle can slide axially to form a dynamic connection. The limiting hole can also select a configuration in which a groove is formed axially on the wall of the circular hole.

Preferably, the limiting hole 207 has a plurality of V-shaped grooves 211 continuously distributed along the circumferential direction on the hole wall, as shown in FIG. 5 . This configuration facilitates the insertion of handle heads of different configurations and forms rotation constraints.

In this example, the screw nut assembly includes a screw 209 and a nut 210 matched therewith. The upper part of the screw 209 is in the cavity of the inner tube 201 in the tube body assembly and its head end is fixed concentrically with the bevel gear 208. When the bevel gear 1 206 rotates, the bevel gear 208 rotates synchronously, thereby driving the screw 209 to rotate. The nut 210 is fixed in the cavity of the outer tube 202 in the tube body assembly. When the screw 209 rotates, the inner tube is raised and lowered relative to the outer tube. The support tube 203 can be fixed in the outer tube 202, and the nut 210 is fixed at the end of the support tube 203. As shown in FIG. 4, a guide groove is formed between the support tube 203 and the cavity wall of the outer tube 202 to guide the movement of the inner tube, thereby improving the stability of the lifting.

The configuration of the handle can be selected according to needs, such as the Z-shape shown in FIG. 2 of this example. The tail end of the handle 205 can be selected to have a hinge structure for easy folding.

The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (8)

1. The lifting mechanism comprises a pipe body assembly and a driving mechanism connected with the pipe body assembly, wherein the driving mechanism comprises a gear transmission assembly, a screw nut assembly and a handle (205), the gear transmission assembly is arranged on the pipe body assembly, the handle (205) is connected with the gear transmission assembly, the handle (205) is used for driving the corresponding pipe body in the pipe body assembly to lift under the transmission fit of the gear transmission assembly and the screw nut assembly, and the lifting mechanism is characterized in that the handle (205) is in movable connection with the gear transmission assembly, a limiting hole (207) which is in plug-in fit with the head end part of the handle is arranged at the position of the gear transmission assembly or the pipe wall on the pipe body along the sliding direction of the handle (205), and the rotation of the handle (205) is limited by the limiting hole (207) when the head end part of the handle (205) is inserted into the limiting hole (207).

2. The lift mechanism of claim 1, wherein: the limiting hole (207) is of a polygonal hole type, and the head end part of the handle (205) is of a polygonal column type.

3. The lift mechanism of claim 2, wherein: a plurality of V-shaped grooves (211) are continuously distributed on the hole wall of the limiting hole (207) along the circumferential direction.

4. The lift mechanism of claim 1, wherein: the gear transmission assembly comprises a gear box (204) and a bevel gear I (206) and a bevel gear II (208) which are matched with each other in a cavity of the gear box, wherein the bevel gear I (206) is vertically arranged and is rotationally connected with the gear box (204), the bevel gear II (208) is horizontally arranged and is rotationally connected with the gear box (204), and the bevel gear I (206) is concentrically connected with a handle (205) and is in movable connection with the handle.

5. The lift mechanism as recited in claim 4 wherein: a polygonal through hole is axially formed in the center of the bevel gear I (206), and a handle (205) which is in plug-in fit with the polygonal through hole is of a corresponding polygonal column shape.

6. The lift mechanism as recited in claim 4 wherein: the screw-nut assembly comprises a nut (210) matched with the screw (209), and the screw (209) is concentrically fixed with the bevel gear II (208).

7. The lift mechanism as recited in claim 6 wherein: the pipe body assembly comprises an inner pipe (201) and an outer pipe (202) which are sleeved, wherein a nut (210) is fixed in a cavity of the outer pipe (202), and the inner pipe is fixed with a gear box (204).

8. Self-locking lifting support comprising a lifting mechanism according to any one of claims 1 to 7, characterized in that: the movable end of the lifting mechanism (2) is provided with a mounting frame (1), and the lifting mechanism (2) is fixed on the base (3).