Sliding sleeve for lifting desk

Abstract

The utility model belongs to the technical field of lifting desks, and particularly relates to a sliding sleeve for a lifting desk, which comprises a sliding sleeve fixedly arranged in an outer tube, a through hole for an inner tube to move is arranged in the middle of the sliding sleeve, first mounting cavities are respectively arranged on two sides of the sliding sleeve, and movable sliding seats are arranged in the first mounting cavities. The two ends of the sliding base are respectively provided with an idler wheel used for making contact with the outer wall of the inner pipe, and a spring is arranged between the sliding base and the sliding sleeve so as to drive the idler wheels to move towards the side close to the inner pipe, through the design of the idler wheels, the friction force between the outer pipe and the inner pipe can be further reduced, and when the vertical pipe is adjusted to move, resistance is smaller; and the mounting position of the sliding seat can be automatically adjusted through the spring and the chute, so that the processing and assembling precision of a product is reduced, or the inner pipe can deform after being used for a long time, and the roller can be ensured to be attached to the outer wall of the inner pipe all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting desks, in particular to a sliding sleeve used for lifting desks. Background Art

[0002] With the continuous development of social education, various educational and teaching equipment are also constantly updated. Among them, desks are one of the most important application tools in the classroom. Technical personnel have developed liftable desks, so that the height of the desks can be adjusted to suit different situations.

[0003] For example, the Chinese utility model, with a publication date of 2023.03.14 and a publication number of CN218605569U, discloses a lifting structure, a lifting desk and a lifting chair, comprising an inner tube, a locking pin, an elastic structure and a positioning sliding sleeve sleeved on the outside of the inner tube; the tube wall of the inner tube is penetrated by a vertical groove and an inclined groove, and the bottom of the inclined groove is connected to the top of the vertical groove; the elastic structure is located in the inner tube and is in a compressed state, and the tension of the elastic structure is applied to the locking pin, and the positioning sliding sleeve is penetrated by a slide groove in the vertical direction, and a side wall of the slide groove close to the inclined groove is alternately provided with a plurality of locking grooves, and under the action of external force, the locking pin slides back and forth between the vertical groove and the inclined groove, and when the inner tube moves upward to a certain position, under the action of the elastic force of the elastic structure, the two ends of the locking pin rebound into the locking groove.

[0004] When adjusting the height, the inner tube moves relative to the outer tube, and friction is generated on the contact surface between the two. By providing a sliding sleeve between the inner tube and the outer tube, the contact area is reduced, thereby reducing the friction force. However, the effect is not obvious, and there is a gap between the inner tube, the outer tube and the sliding sleeve, which will also lead to unstable movement. Therefore, the structure needs to be further improved. Utility Model Content

[0005] The utility model aims to provide a sliding sleeve for lifting desks, which solves the problem of large friction force in the prior art through rollers.

[0006] The purpose of the utility model is achieved as follows: a sliding sleeve for lifting desks, including a sliding sleeve for being fixed in an outer tube, a through hole for the inner tube to move is provided in the middle of the sliding sleeve, installation cavities are provided on both sides of the sliding sleeve, a movable sliding seat is provided in the installation cavity, rollers for contacting the outer wall of the inner tube are respectively installed at both ends of the sliding seat, and a spring is provided between the sliding seat and the sliding sleeve to drive the roller to move toward the side close to the inner tube.

[0007] Preferably, rotating shafts are respectively arranged on both sides of the roller, mounting holes for the rotating shafts to pass through are respectively opened at both ends of the sliding seat, and an inclined hole for the rotating shafts to move is opened on the side wall of the first mounting cavity.

[0008] Preferably, the first mounting cavity is communicated with the through hole, two mounting parts are formed at the end of the sliding seat, and a mounting groove for mounting the roller is formed between the two mounting parts.

[0009] Preferably, a mounting block is provided in the first mounting cavity, the mounting block is connected to the sliding sleeve, a second mounting cavity is provided in the sliding seat, and the spring is abutted between the second mounting cavity and the mounting block.

[0010] Preferably, a first mounting column is formed on the mounting block, a second mounting column is formed in the second mounting cavity, and two ends of the spring are respectively sleeved on the outer circumference of the first mounting column and the second mounting column.

[0011] Preferably, a clamping block is formed on the side surface of the sliding sleeve.

[0012] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0013] The utility model can further reduce the friction between the outer tube and the inner tube through the design of the roller, so that when adjusting the movement of the vertical tube, the resistance is smaller and the movement is smoother and more stable, and through the design of the spring and the inclined groove, the roller can be driven to move toward the side close to the inner tube, so that during the movement of the inner tube, the roller always keeps in contact with the outer wall thereof, reducing the gap between the outer tube, the inner tube and the sliding sleeve, ensuring stable movement and not easy to shake. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure when the outer tube, inner tube and sliding sleeve are separated.

[0015] Figure 2 It is a schematic diagram of the structure when the sliding sleeve and the sliding seat are separated.

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the sliding seat installed in the sliding sleeve.

[0017] Figure 4 The structure of the utility model is shown in FIG. Figure 1 .

[0018] Figure 5 The structure of the utility model is shown in FIG. Figure 2 .

[0019] Figure markings: 1-outer tube; 2-inner tube; 3-sliding sleeve; 4-through hole; 5-mounting cavity one; 6-sliding seat; 7-roller; 8-spring; 9-rotating shaft; 10-mounting hole; 11-inclined hole; 12-mounting part; 13-mounting groove; 14-mounting block; 15-mounting cavity two; 16-mounting column one; 17-mounting column two; 18-block. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-5 As shown, a sliding sleeve for lifting desks includes a sliding sleeve 3 fixed in an outer tube 1, a through hole 4 for the inner tube 2 to move is provided in the middle of the sliding sleeve 3, mounting cavities 5 are provided on both sides of the sliding sleeve 3, a movable sliding seat 6 is provided in the mounting cavity 5, rollers 7 for contacting the outer wall of the inner tube 2 are respectively installed at both ends of the sliding seat 6, and a spring 8 is provided between the sliding seat 6 and the sliding sleeve 3 to drive the roller 7 to move toward the side close to the inner tube 2.

[0022] The utility model can further reduce the friction between the outer tube 1 and the inner tube 2 through the design of the roller 7, so that when adjusting the movement of the vertical tube, the resistance is smaller and the movement is smoother and more stable. In addition, through the design of the spring 8 and the inclined groove, the roller 7 can be driven to move to the side close to the inner tube 2, so that during the movement of the inner tube 2, the roller 7 always keeps in contact with the outer wall thereof, reducing the gap between the outer tube 1, the inner tube 2 and the sliding sleeve, ensuring stable movement and not easy to shake.

[0023] The two sides of the roller 7 are provided with rotating shafts 9, and the two ends of the sliding seat 6 are provided with mounting holes 10 for the rotating shaft 9 to pass through. The side wall of the mounting cavity 15 is provided with an inclined hole 11 for the rotating shaft 9 to move. The length of the inclined hole 11 is 6-8 mm, and the inclination angle is small, which is an acute angle, which can effectively prevent the table from being displaced in the horizontal direction. If the inner tube is squeezed in the horizontal direction, it will act on the inclined groove. With the support of the spring, the inner tube will not be displaced in the horizontal direction and will not shake. The installation position of the sliding seat 6 is adjusted to adapt to the deviation of the inner tube size of ±0.6mm during the production process. For example, during the processing of the inner tube and the outer tube, there will be a certain deviation in the size of the production. Through this technical solution, the processing and assembly accuracy of the product can be reduced, or the inner tube will be deformed under long-term use, resulting in a change in the gap between the inner tube and the outer tube, and it can also ensure that the roller 7 always stays in contact with its outer wall.

[0024] The mounting cavity 15 is communicated with the through hole 4, and two mounting parts 12 are formed at the end of the sliding seat 6. The mounting part 12 is protruding to one side, and a mounting groove 13 for mounting the roller 7 is formed between the two mounting parts 12. Rolling friction is used to replace the sliding friction in the prior art, thereby effectively reducing resistance.

[0025] A mounting block 14 is provided in the mounting cavity 1 5, and the mounting block 14 is connected to the sliding sleeve 3. A mounting cavity 2 15 is provided in the sliding seat 6, and the spring 8 is abutted between the mounting cavity 2 15 and the mounting block 14. The spring 8 can keep pushing the sliding seat 6 upward through its own elastic force, that is, to make the roller 7 close to the outer wall of the inner tube.

[0026] The mounting block 14 is formed with a mounting post 16 , and the mounting cavity 15 is formed with a mounting post 2 17 . Both ends of the spring 8 are respectively sleeved on the outer periphery of the mounting post 1 16 and the mounting post 2 17 to prevent the spring 8 from falling.

[0027] A clamping block 18 is formed on the side surface of the sliding sleeve 3 so as to fix the sliding sleeve 3 in the outer tube 1 .

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A sliding sleeve for lifting desks, characterized in that: The invention comprises a sliding sleeve (3) for being fixed in an outer tube (1), a through hole (4) for allowing an inner tube (2) to move is provided in the middle of the sliding sleeve (3), mounting cavities (5) are provided on both sides of the sliding sleeve (3), a movable sliding seat (6) is provided in the mounting cavity (5), rollers (7) for contacting the outer wall of the inner tube (2) are provided at both ends of the sliding seat (6), and a spring (8) is provided between the sliding seat (6) and the sliding sleeve (3) to drive the roller (7) to move toward a side close to the inner tube (2).

2. The sliding sleeve for lifting desks according to claim 1, characterized in that: Rotating shafts (9) are respectively arranged on both sides of the roller (7), mounting holes (10) for the rotating shaft (9) to pass through are respectively opened at both ends of the sliding seat (6), and an inclined hole (11) for the rotating shaft (9) to move is opened on the side wall of the mounting cavity 1 (5).

3. The sliding sleeve for lifting desks according to claim 2, characterized in that: The installation cavity 1 (5) is connected to the through hole (4); two installation parts (12) are formed at the end of the sliding seat (6); and an installation groove (13) for installing the roller (7) is formed between the two installation parts (12).

4. The sliding sleeve for lifting desks according to claim 1, characterized in that: The first installation cavity (5) is provided with an installation block (14), the installation block (14) is connected to the sliding sleeve (3), the sliding seat (6) is provided with a second installation cavity (15), and the spring (8) is abutted between the second installation cavity (15) and the installation block (14).

5. The sliding sleeve for lifting desks according to claim 4, characterized in that: A first mounting column (16) is formed on the mounting block (14), a second mounting column (17) is formed in the second mounting cavity (15), and two ends of the spring (8) are respectively sleeved on the outer periphery of the first mounting column (16) and the second mounting column (17).

6. The sliding sleeve for lifting desks according to claim 1, characterized in that: A clamping block (18) is formed on the side surface of the sliding sleeve (3).

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