Lifting rod retainer

Abstract

The utility model relates to the technical field of lifting rods, in particular to a lifting rod retainer which comprises a retainer body in a circular tube shape, ball grooves which are evenly distributed are formed in the outer wall of the retainer body, balls are placed in the ball grooves, the ball grooves comprise a first groove, a second groove and a third groove, and the first groove is communicated with the second groove. The end of the first groove is communicated with the end of the second groove through a third groove, the third groove is in a circular arc shape, the depth of the first groove is different from that of the second groove, in the retainer, the depth of the first groove is different from that of the second groove, and when a ball rolls to the shallower side of the ball groove, the first groove and the second groove of the ball groove are separated from each other. The top ends of the balls make contact with the inner wall of the lifting rod outer pipe, when the balls roll to the deeper sides of the ball grooves, gaps exist between the balls and the lifting rod outer pipe, and in the lifting process, only the balls circularly rotate around the ball grooves, so that the lifting rod is smoother during lifting.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting rods, in particular to a lifting rod retaining frame. Background Art

[0002] A lifting rod generally includes an inner tube and an outer tube. The inner tube can rise or fall along the axis of the outer tube. Common lifting rods mainly include electric lifting rods, pneumatic lifting rods and manual lifting rods. In a lifting rod, there is generally a gap between the inner tube and the outer tube. In order to improve the stability of the lifting rod when it is lifted or lowered, a retaining frame is generally installed at the lower end of the inner tube or the upper end of the outer tube. The retaining frame is used to improve the stability of the lifting rod when it is lifted or lowered. For example, when the retaining frame is installed at the lower end of the inner tube, the outer wall of the retaining frame can contact the inner wall of the outer tube during the movement of the inner tube, so that the inner tube is not easy to shake. Ball bearings are installed on the retaining frame. Through the friction between the ball bearings and the outer tube or the inner tube, the smoothness of the lifting rod can be further improved. However, the existing ball bearings can only rotate in a fixed area on the retaining frame and cannot roll along the ball bearing grooves, which has certain defects. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a lifting rod retaining frame.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A lifting rod retainer includes a retainer body in the shape of a circular tube, the outer wall of the retainer body is provided with evenly distributed ball grooves, balls are placed in the ball grooves, the ball grooves include a first groove, a second groove and a third groove, the end of the first groove and the end of the second groove are connected through the third groove, the third groove is an arc shape, the depth of the first groove is different from the depth of the second groove, when the ball rolls to the shallower side of the ball groove, the end of the ball extends to the outside of the ball groove.

[0006] Preferably, an undercut is provided at the edge of the ball groove for limiting the balls from falling off.

[0007] Preferably, one end of the retainer body is connected to a limiting sleeve, and a gap for the balls to pass through is provided at the end of the third groove close to the limiting sleeve, and the gap at the end of the third groove is closed by the limiting sleeve.

[0008] Preferably, a connecting portion is provided at one end of the retaining frame body, and the connecting portion is adapted to the limiting sleeve.

[0009] Preferably, a slot is provided on the connecting portion, and a block matching the slot is provided on the limiting sleeve.

[0010] Preferably, a connecting block is provided on the retaining frame body.

[0011] Preferably, a limiting groove is provided at the end of the retaining frame body.

[0012] The beneficial effect of the utility model is that in the retaining frame, the depths of the first groove and the second groove in the ball groove are inconsistent, when the ball rolls to the shallower side of the ball groove, the top of the ball contacts the inner wall of the outer tube of the lifting rod, and when the ball rolls to the deeper side of the ball groove, there is a gap between the ball and the outer tube of the lifting rod. During the lifting process, only the ball circulates around the ball groove, making the lifting and lowering of the lifting rod smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional structural schematic diagram of a lifting rod retainer proposed by the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of a limit sleeve and a holder body of a lifting rod holder proposed by the utility model after being decomposed;

[0015] Figure 3 This is a schematic structural diagram of a cage body of a lifting rod cage proposed by the utility model;

[0016] Figure 4 The utility model is a schematic cross-sectional structure diagram of a retainer body of a lifting rod retainer.

[0017] In the figure: 1 cage body, 2 ball groove, 3 ball, 4 limit sleeve, 11 connecting part, 12 clamping groove, 13 connecting block, 14 limit groove, 15 convex strip, 21 first groove, 22 second groove, 23 third groove, 24 undercut, 41 clamping block, 42 ​​groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-4 A lifting rod holder includes a holder body 1 in a round tube shape, and the outer wall of the holder body 1 is provided with evenly distributed ball grooves 2, and balls 3 are placed in the ball grooves 2. The ball grooves 2 include a first groove 21, a second groove 22, and a third groove 23. The end of the first groove 21 and the end of the second groove 22 are connected through the third groove 23. The third groove 23 is an arc shape. The depth of the first groove 21 is different from the depth of the second groove 22. When the ball 3 rolls to the shallower side of the ball groove 2, the end of the ball 3 extends to the outside of the ball groove 2, such as Figure 4 As shown, the first trench 21 is shallower than the second trench 22 .

[0020] An undercut 24 is provided at the edge of the ball groove 2 to prevent the ball 3 from falling off.

[0021] One end of the retainer body 1 is connected to the limiting sleeve 4, and a gap for the ball 3 to pass through is set at the end of the third groove 23 near the limiting sleeve 4. The gap at the end of the third groove 23 is closed by the limiting sleeve 4. After removing the limiting sleeve 4, the ball 3 can be installed in the ball groove 2. After the ball 3 is installed, the limiting sleeve 4 can be installed to prevent the ball 3 from falling off.

[0022] A connecting portion 11 is provided at one end of the retainer body 1 , and the connecting portion 11 is matched with the limiting sleeve 4 .

[0023] A card slot 12 is provided on the connecting portion 11, and a card block 41 matched with the card slot 12 is provided on the limiting sleeve 4. An annular convex strip 15 is also provided on the connecting portion 11, and an annular groove 42 is provided on the inner wall of the limiting sleeve 4. The convex strip 15 cooperates with the groove 42, and the limiting sleeve 4 will not axially disengage. Furthermore, the convex strip 15 can also be installed on the limiting sleeve 4, and the groove 42 is provided on the connecting portion 11, that is, the positions of the two are replaced.

[0024] A connecting block 13 is provided on the retainer body 1, and the retainer can be installed on the inner tube of the lifting rod through the connecting block 13; a limiting groove 14 is provided at the end of the retainer body 1, and the retainer body 1 cooperates with the limiting block of the inner tube of the lifting rod through the limiting groove 14, which can prevent the retainer body 1 from circumferential rotation and also facilitate the mold structure design.

[0025] In a conventional cage, when the depth of the ball groove 2 is consistent, during the lifting process, the balls 3 in the ball groove 2 will rotate simultaneously, and the balls 3 will be in tangential contact with each other, so that the balls 3 cannot roll along the ball groove 2 .

[0026] In the retaining frame, the depths of the first groove 21 and the second groove 22 in the ball groove 2 are different. When the ball 3 rolls to the shallower side of the ball groove 2, the top of the ball 3 contacts the inner wall of the outer tube of the lifting rod. When the ball 3 rolls to the deeper side of the ball groove 2, there is a gap between the ball 3 and the outer tube of the lifting rod. During the lifting process, only the ball 3 circulates around the ball groove 2, making the lifting of the lifting rod smoother.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lifting rod holder, comprising a holder body (1) in the shape of a circular tube, characterized in that: The outer wall of the retainer body (1) is provided with evenly distributed ball grooves (2), and balls (3) are placed in the ball grooves (2). The ball grooves (2) include a first groove (21), a second groove (22) and a third groove (23). The end of the first groove (21) and the end of the second groove (22) are connected through the third groove (23). The third groove (23) is in an arc shape. The depth of the first groove (21) is different from the depth of the second groove (22). When the ball (3) rolls to the shallower side of the ball groove (2), the end of the ball (3) extends to the outside of the ball groove (2).

2. A lifting rod holder according to claim 1, characterized in that: An undercut (24) for limiting the falling off of the ball (3) is arranged at the edge of the ball groove (2).

3. The lifting rod holder according to claim 1, characterized in that: One end of the retainer body (1) is connected to a limiting sleeve (4); a gap for the ball (3) to pass through is provided at the end of the third groove (23) close to the limiting sleeve (4); and the gap at the end of the third groove (23) is closed by the limiting sleeve (4).

4. A lifting rod holder according to claim 2, characterized in that: A connecting portion (11) is provided at one end of the retaining frame body (1), and the connecting portion (11) is adapted to fit the limiting sleeve (4).

5. A lifting rod holder according to claim 4, characterized in that: The connecting portion (11) is provided with a clamping groove (12), and the limiting sleeve (4) is provided with a clamping block (41) adapted to the clamping groove (12).

6. A lifting rod holder according to any one of claims 1 to 5, characterized in that: A connecting block (13) is provided on the retaining frame body (1).

7. A lifting rod holder according to claim 6, characterized in that: A limiting groove (14) is provided at the end of the retaining frame body (1).

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