Guide sleeve and lifting table leg

Abstract

The invention relates to the technical field of linear guiding, and discloses a guide sleeve and a lifting table leg, the lifting table leg comprises a fixed pipe and an adjusting pipe lifted in the fixed pipe, the guide sleeve is assembled between the fixed pipe and the adjusting pipe, the guide sleeve comprises a sleeve body, and a plurality of holding lubricating assemblies are arranged on the inner wall of the sleeve body at intervals in the circumferential direction of the sleeve body; the enclasping guide assembly comprises a movable block which moves on the sleeve body in a guiding mode in the tendency of inclining towards the axis of the sleeve body by a preset acute angle; the rolling body is rotationally arranged on the movable block and partially extends to one side, close to the axis of the sleeve body, of the movable block; the elastic piece is arranged between the sleeve body and the movable block and used for driving the rolling body to move to the position closest to the axis of the sleeve body along with the movable block, and the guide sleeve can eliminate shaking caused by size deviation or assembly deviation of the adjusting pipe, and meanwhile the adjusting pipe can smoothly move in the guide sleeve in a labor-saving mode.

Description

Technical Field

[0001] The invention relates to the technical field of linear guides, and in particular to a guide sleeve and a lifting table leg. Background Art

[0002] Desks are essential teaching aids in schools. In order to increase the adaptability of desks, the legs of desks currently on the market can basically be raised and lowered. Most of the lifting legs include a fixed tube and an adjustment tube that can be raised and lowered relative to the fixed tube. The bottom of the fixed tube is fixed to the support foot, and the top of the adjustment tube is fixed to the tabletop. A guide sleeve is fixedly inserted into the inner wall of the fixed tube for the adjustment tube to be inserted and vertically guided.

[0003] In order to improve the smoothness of the lifting and lowering of the adjusting tube, some guide sleeves are provided with balls for reducing friction. The specific structure can refer to the integrated ball guide sleeve disclosed in the Chinese patent with the announcement number CN213733591U, including a guide sleeve, the inner guide hole of the guide sleeve is provided with a ball bushing, the ball bushing is evenly distributed on the ball bushing, and the ball bushing is fixed to the guide sleeve by a fixing part.

[0004] When this ball guide sleeve is applied to the table leg, it can improve the smoothness of the adjustment tube's relative lifting and lowering relative to the fixed tube. However, due to production errors, the adjustment tube and the guide sleeve are often too tight or too loose when assembled. Too tightness may cause the adjustment tube to get stuck when it is lifted, while too looseness may cause the adjustment tube to shake when it is lifted. Summary of the invention

[0005] The present invention aims to solve the problem that the existing guide sleeve structure cannot eliminate the problem of the guide sleeve and the pipe fitting matched therewith being too tight or too loose due to errors. The first purpose of the present invention is to provide a guide sleeve that can adaptively eliminate matching errors.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A guide sleeve comprises a sleeve body, wherein a plurality of groups of clamping and lubricating components are arranged on the inner wall of the sleeve body at intervals around the circumference of the sleeve body, and the clamping and guiding components comprise:

[0008] The movable block is guided to move on the sleeve body in a manner of being inclined toward the axis of the sleeve body at a preset acute angle;

[0009] The rolling body is rotatably arranged on the movable block and partially extends to a side of the movable block close to the axis of the sleeve body;

[0010] The elastic member is arranged between the sleeve body and the movable block, and is used for driving the rolling body to move with the movable block to the axis closest to the sleeve body.

[0011] The above scheme is adopted to add a clamping guide component, in which the movable block is guided to move in a trend of inclination toward the axis direction of the sleeve body (that is, forming a preset acute angle with the inner wall of the sleeve body), so as to adjust the distance of the rolling body along the axis center of the sleeve body, so that all the rolling bodies can always be elastically pressed against the outer ring wall of the adjusting tube, which can not only overcome the shaking caused by the size deviation or assembly deviation of the adjusting tube, but also significantly reduce the significant increase in friction caused by the elastic force of the elastic part. Combined with the design of the rolling body, the guide sleeve can eliminate the adverse effects caused by the size deviation or assembly deviation of the adjusting tube while making the adjusting tube move very smoothly and labor-saving therein.

[0012] Preferably, the angle at which the movable block is inclined toward the axis of the sleeve body is 5° to 15°.

[0013] With the above solution, an angle range of 5° to 15° is more appropriate.

[0014] Preferably, the cross section of the sleeve body is circular, elliptical, regular polygonal or rectangular.

[0015] By adopting the above scheme, the cross-section of the sleeve can be adaptively changed according to the cross-section of the adjusting tube matched with the sleeve, so as to achieve the expected lubrication and labor-saving effects. The number of groups and the installation position of the clamping lubrication assembly can be changed according to the actual shape finally adopted by the sleeve, and the inclination angle of the movable block can also be adaptively changed within a range.

[0016] Preferably, a matching structure for guiding the movable block and limiting its stroke is provided between the movable block and the sleeve body, the matching structure comprising a first through groove opened on the side wall of the sleeve body and capable of accommodating and allowing the movable block to move, guide rods protruding on both sides of the movable block, and guide grooves obliquely provided on both side walls of the first through groove and capable of partially inserting the guide rods, the inclination angle of the guide groove being the inclination angle of the movable block toward the axis of the sleeve body.

[0017] With the above solution, the inclination angle of the guide groove represents the angle between the movable block and the inner wall of the sleeve when the movable block moves, and the length of the guide groove can be used to convert the radial movement stroke of the movable block and the error range that can be eliminated.

[0018] Preferably, the rolling body is a roller, and the movable block is provided with a second through slot which can accommodate the roller and partially expose the roller. After the central axis of the roller passes through the second through slot, its extended section is a guide rod which is plugged into the guide slot.

[0019] By adopting the above scheme, the central axis assembles the roller, the movable block and the sleeve. One component has the triple functions of support, connection and guidance. The structure is ingenious. The roller cannot deflect. After elastically contacting with the adjusting tube, it can also prevent the adjusting tube from slightly deflecting.

[0020] Preferably, at least two groups of guide grooves are arranged at intervals along the axial direction of the sleeve body, and a corresponding number of rollers are arranged correspondingly.

[0021] With the above solution, since the central axis is a circular axis, more than two groups of rollers need to be provided to prevent the movable block from deflecting around the axis and ensure that the movable block is always guided and moved in a vertical state along a preset angle inclined toward the axis.

[0022] Preferably, the elastic member is a spring, a positioning column is protruding from the bottom of the first through groove, a positioning groove is recessed at the lower end of the movable block, the lower end of the spring is sleeved outside the positioning column and the upper end of the spring is inserted into the positioning groove, and the two ends of the spring are elastically abutted against the bottom of the first through groove and the bottom of the positioning groove respectively.

[0023] By adopting the above solution, the spring can provide elastic force to enable the roller to press against the outer wall of the adjusting tube, and the spring itself can also eliminate the angular deviation caused by the movement of the movable block through twisting.

[0024] Preferably, a first weight-reducing groove is recessed between two adjacent first through grooves on the outer wall of the sleeve, and the first weight-reducing groove drives both sides of the guide groove to penetrate; a second weight-reducing groove is arranged between adjacent rollers on the movable block.

[0025] By adopting the above solution, the provision of the weight-reducing groove can reduce material usage and reduce costs.

[0026] Preferably, a lap ring is horizontally protruded outwardly at the upper end of the sleeve body, and the lower end of the sleeve body is configured to be a frustum with the tip facing downward.

[0027] With the above solution, the overlapping ring at the upper end of the sleeve is used to limit the insertion depth of the sleeve, and the frustum-shaped design at the lower end of the sleeve facilitates the insertion of the sleeve.

[0028] The second purpose of the present invention is to provide a lifting table leg, including a fixed tube and an adjusting tube, wherein the guide sleeve is interference-inserted at one end of the fixed tube, one end of the adjusting tube is inserted into the guide sleeve and the outer wall of the adjusting tube is elastically abutted against the rolling body.

[0029] By adopting the above solution and applying the guide sleeve to the lifting table leg, the lifting and lowering of the adjusting tube relative to the fixed tube can be smoother, more stable and more labor-saving.

[0030] The present invention has significant technical effects due to the adoption of the above technical scheme: an additional clamping guide assembly is provided, in which the movable block is guided to move with a tendency of being inclined 5° to 15° toward the axial direction of the sleeve body, that is, the adjustment of the roller distance along the axial center of the sleeve body is realized, so that all the rollers can always be elastically pressed against the outer ring wall of the adjusting tube, which can not only overcome the shaking caused by the size deviation or assembly deviation of the adjusting tube, but also significantly reduce the significant increase in friction caused by the spring elastic force. With the cooperation of the rollers, the guide sleeve can eliminate the adverse effects caused by the size deviation or assembly deviation of the adjusting tube while enabling the adjusting tube to move therein very stably, smoothly and labor-savingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is an axonometric view of a guide sleeve of the present embodiment;

[0032] Figure 2 is a front view of a guide sleeve of this embodiment;

[0033] Figure 3 yes Figure 2 AA cross-sectional view;

[0034] Figure 4 It is an axonometric view of the lifting table leg equipped with the guide sleeve of this embodiment.

[0035] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. sleeve; 2. first through groove; 3. first weight-reducing groove; 4. lap ring; 5. movable block; 6. roller; 7. second through groove; 8. second weight-reducing groove; 9. guide groove; 10. guide rod; 11. spring; 12. positioning column; 13. positioning groove; 14. fixing tube; 15. adjusting tube. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] A lifting table leg, referring to Figure 1 to Figure 4 As shown, it includes a fixed tube 14 fixed to the support leg and an adjusting tube 15 fixed to the desktop. The lower end of the adjusting tube 15 is inserted into the fixed tube 14, and a guide tube sleeve is inserted at the upper end of the fixed tube 14 to allow the adjusting tube 15 to be smoothly, stably and labor-savingly lifted and lowered.

[0038] The guide sleeve includes a sleeve body 1, see Figure 1 As shown, the cross-section of the sleeve body 1 is circular, and the upper end of the sleeve body 1 extends horizontally outward to have a lap ring 4 that can overlap with the upper end of the fixed tube 14. The lower end of the sleeve body 1 is arranged in a cone shape for easy introduction into the fixed tube 14. Three first through grooves 2 are evenly spaced circumferentially on the outer ring wall of the sleeve body 1, and a set of clamping and lubricating components is assembled in each first through groove 2.

[0039] The clamping and lubricating assembly includes a movable block 5 which is guided and slidably moved at an acute angle of 10° to the inner wall of the sleeve body 1, a roller 6 is mounted on the side wall of the movable block 5 close to the axis of the sleeve body 1, and a spring 11 is arranged between the bottom of the first through groove 2 and the bottom of the movable block 5 to realize the elastic pressing of the roller 6 against the outer ring wall of the adjusting tube 15.

[0040] The assembly structure of the roller 6, the movable block 5 and the sleeve 1 is as follows: a second through groove 7 for assembling the roller 6 and allowing the roller 6 to partially expose the movable block 5 is opened on the movable block 5, and the roller 6 is rotatably sleeved on the central axis. The two ends of the central axis of the roller 6 extend to the outside of the movable block 5 after passing through the groove wall of the second through groove 7. Guide grooves 9 inclined 10° to the axial direction of the sleeve 1 are provided on both side walls of the first through groove 2. The two extended ends of the central axis become guide rods 10 that cooperate with the guide grooves 9. Two groups of guide grooves 9 are arranged at intervals along the axial direction of the sleeve 1, and two groups of rollers 6 are arranged accordingly.

[0041] A positioning column 12 is protruding from the bottom of the first through groove 2, and a positioning groove 13 is recessed at the lower end of the movable block 5. The lower end of the spring 11 is sleeved outside the positioning column 12 and the upper end of the spring 11 is inserted into the positioning groove 13. The two ends of the spring 11 are elastically abutted against the bottom of the first through groove 2 and the bottom of the positioning groove 13 respectively. The spring 11 is used to drive the movable block 5 to move at an inclined angle of 10° relative to the inner wall of the sleeve body 1 until the roller 6 thereon elastically presses against the outer wall of the adjusting tube 15.

[0042] A first weight-reducing groove 3 is recessed between two adjacent first through grooves 2 on the outer wall of the sleeve 1. The first weight-reducing groove 3 drives the two sides of the guide groove 9 to pass through, which is convenient for the assembly of the central axis; a second weight-reducing groove 8 is arranged between adjacent rollers 6 on the movable block 5.

[0043] In this solution, three groups of clamping guide components are evenly spaced circumferentially arranged on the inner ring wall of the sleeve body 1. In the clamping guide component, the movable block 5 is guided to move with a tendency of being inclined 10° toward the axial direction of the sleeve body 1, that is, the adjustment of the roller 6 along the axial center of the sleeve body 1 is realized, so that all the rollers 6 can always be elastically pressed against the outer ring wall of the adjusting tube 15, which can not only overcome the shaking caused by the size deviation or assembly deviation of the adjusting tube 15, but also significantly reduce the significant increase in friction caused by the elastic force of the spring 11. With the cooperation of the roller 6, the guide sleeve can eliminate the adverse effects caused by the size deviation or assembly deviation of the adjusting tube 15 while allowing the adjusting tube 15 to move very stably, smoothly and labor-savingly therein.

[0044] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A guide sleeve, comprising a sleeve body (1), characterized in that: A plurality of groups of clamping and lubricating components are arranged on the inner wall of the sleeve body (1) at intervals in the circumferential direction of the sleeve body (1), and the clamping and guiding components include: The movable block (5) is guided to move on the sleeve body (1) in a manner inclined at a preset acute angle toward the axis of the sleeve body (1); A rolling body, rotatably arranged on the movable block (5) and partially extending to a side of the movable block (5) close to the axis of the sleeve body (1); The elastic member is arranged between the sleeve (1) and the movable block (5) and is used to drive the end of the movable block (5) close to the axis of the sleeve (1) to move to the point with the shortest distance from the axis and to drive the rolling body to move with the movable block (5) to the point closest to the axis of the sleeve (1).

2. A guide sleeve according to claim 1, characterized in that: The included angle of inclination of the movable block (5) to the axis of the sleeve body (1) is 5° to 15°.

3. A guide sleeve according to claim 2, characterized in that: The cross section of the sleeve body (1) is circular, elliptical, regular polygonal or rectangular.

4. A guide sleeve according to claim 2 or 3, characterized in that: A matching structure for guiding the movable block (5) and limiting the stroke is provided between the movable block (5) and the sleeve (1). The matching structure comprises a first through slot (2) provided on the side wall of the sleeve (1) and capable of accommodating and allowing the movable block (5) to move, a guide rod (10) protrudingly provided on both sides of the movable block (5), and a guide slot (9) provided obliquely on both side walls of the first through slot (2) and capable of partially inserting the guide rod (10). The inclination angle of the guide slot (9) is the inclination angle of the movable block (5) toward the axis of the sleeve (1).

5. A guide sleeve according to claim 4, characterized in that: The rolling body is a roller (6), and a second through slot (7) is provided on the movable block (5) in which the roller (6) can be internally housed and partially exposed. After the central axis of the roller (6) passes through the second through slot (7), its extended section is a guide rod (10) plugged into and matched with the guide slot (9).

6. A guide sleeve according to claim 5, characterized in that: At least two groups of guide grooves (9) are arranged at intervals along the axial direction of the sleeve body (1), and a corresponding number of rollers (6) are arranged correspondingly.

7. A guide sleeve according to claim 4, characterized in that: The elastic member is a spring (11), a positioning column (12) is protruding from the bottom of the first through slot (2), a positioning groove (13) is recessed at the lower end of the movable block (5), the lower end of the spring (11) is sleeved outside the positioning column (12) and the upper end of the spring (11) is inserted into the positioning groove (13), and the two ends of the spring (11) are elastically abutted against the bottom of the first through slot (2) and the bottom of the positioning groove (13) respectively.

8. A guide sleeve according to claim 6, characterized in that: A first weight-reducing groove (3) is recessed between two adjacent first through grooves (2) on the outer wall of the sleeve (1), and the first weight-reducing groove (3) drives the two sides of the guide groove (9) to penetrate through; a second weight-reducing groove (8) is arranged between adjacent rollers (6) on the movable block (5).

9. A guide sleeve according to claim 1, characterized in that: The upper end of the sleeve body (1) is provided with a lap ring (4) protruding outward horizontally, and the lower end of the sleeve body (1) is arranged in a frustum shape with the tip facing downward.

10. A lifting table leg, comprising a fixing tube (14) and an adjusting tube (15), characterized in that: A guide sleeve as claimed in any one of claims 1 to 9 is interference-inserted at one end of the fixed tube (14), one end of the adjustment tube (15) is inserted into the guide sleeve and the outer wall of the adjustment tube (15) is elastically abutted against the rolling body.

Images