Self-locking reducing sleeve capable of rotating forwards and backwards

Abstract

The utility model discloses a self-locking reducing sleeve capable of rotating forwards and backwards. The self-locking reducing sleeve comprises an outer sleeve, an inner sleeve arranged in the outer sleeve, a telescopic column arranged in the inner sleeve and a clamping jaw arranged on the telescopic column. The concave blocks of the outer cylinder are matched with the convex surfaces of the clamping jaws, so that the convex surfaces of the clamping jaws can be extruded by the concave blocks of the outer cylinder no matter the outer cylinder is rotated forwards or reversely, the clamping jaws are drawn close to the center, torsion of the outer cylinder is converted into clamping force of a screw, the screw is firmly clamped, and self-locking is achieved; and the device can be suitable for screwing in and screwing out screws of different specifications.

Description

Technical Field

[0001] The utility model belongs to the technical field of hardware tools, in particular to a self-locking variable diameter sleeve which can rotate forward and reverse. Background Art

[0002] Existing wrench sockets can usually only be used to screw screws of one specification. For screws of different specifications, wrench sockets of different specifications need to be replaced, which makes use inconvenient.

[0003] Chinese patent CN 110757382A discloses a self-locking reducer wrench sleeve. The problem with this technical solution is that the screw can only be screwed in (or screwed back), but not screwed back (or screwed in), because the rotation directions of the sleeve for screwing in and screwing back are opposite, and the sleeve in this technical solution has only one rotation direction to produce radial compression on the clamping jaws, and the other rotation direction does not produce radial compression on the clamping jaws, so the clamping jaws cannot clamp the screw. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the utility model provides a self-locking variable diameter sleeve which can rotate forward and reverse.

[0005] The technical solution adopted by the utility model is: a self-locking variable diameter sleeve capable of forward and reverse rotation, comprising an outer cylinder, an inner cylinder arranged in the outer cylinder, a telescopic column arranged in the inner cylinder, and a clamping claw arranged on the telescopic column;

[0006] The outer cylinder is a hollow cylinder with one end open and the other end closed. Three identical concave blocks are evenly distributed on the inner wall of the outer cylinder. The surface of the concave blocks facing the center of the cylinder is V-shaped. An axial hole is provided at the center of the inner side surface of the closed end of the outer cylinder.

[0007] The inner cylinder is a hollow cylinder with one end open and the other end closed. A central axis protrudes outward from the center of the closed end. The inner cylinder is rotatably arranged in the outer cylinder through the central axis and the axial hole of the outer cylinder. Three through holes are evenly arranged along the cylinder wall of the open end of the inner cylinder. The shape of the through holes matches the clamping claw. A column hole is arranged at the center of the closed end of the inner cylinder, and the column hole extends to the inside of the central axis.

[0008] One end of the telescopic column extends into the column hole, and the other end is provided with a center hole and three connecting blocks. A first spring is provided in the center hole, and a contact is provided at the outer end of the first spring. The contact extends out of the center hole. A second spring is sleeved on the telescopic column, and the two ends of the second spring are respectively against the inner cylinder and the connecting block, and the stiffness of the second spring is less than that of the first spring.

[0009] There are three clamping jaws, which are respectively embedded in the three through holes of the inner cylinder. The top ends of the three clamping jaws are hinged to the three connecting blocks through levers. The outer side walls of the clamping jaws are provided with convex surfaces matching the concave blocks. When the outer cylinder rotates forward and reversely, the concave blocks of the outer cylinder abut against the convex surfaces of the clamping jaws and squeeze the clamping jaws radially.

[0010] Furthermore, a connector that cooperates with an electric wrench is provided at the center of the outer side surface of the closed end of the outer cylinder.

[0011] The working process of the utility model is as follows: the contact head is pressed against the top surface of the screw. Since the stiffness of the first spring is greater than the stiffness of the second spring, the telescopic column moves upward, and the telescopic column drives the three clamping jaws to move toward the center through the lever, and clamps the outer wall of the screw to complete the initial clamping of the screw; after the clamping jaws clamp the screw, no matter whether the outer cylinder is rotated forward or reversely, the concave blocks of the outer cylinder will squeeze the convex surfaces of the clamping jaws, so that the clamping jaws move toward the center, and then further firmly clamp the screw to achieve a self-locking function.

[0012] The utility model has the beneficial effects that the concave block of the outer cylinder cooperates with the convex surface of the clamping jaw. No matter the outer cylinder is rotated forward or reversely, the concave block of the outer cylinder will squeeze the convex surface of the clamping jaw, so that the clamping jaw moves closer to the center, and the torque of the outer cylinder is converted into the clamping force of the screw, so that the screw is firmly clamped to achieve self-locking, and it can be suitable for screwing in and out of screws of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] like Figure 1 It is a schematic diagram of the longitudinal section structure of the utility model.

[0014] like Figure 2 It is a schematic diagram of the longitudinal section structure of the outer cylinder.

[0015] like Figure 3 It is a schematic diagram of the cross-section structure of the outer cylinder.

[0016] like Figure 4 It is a schematic diagram of the longitudinal section structure of the inner tube.

[0017] like Figure 5 It is a three-dimensional schematic diagram of the inner tube appearance.

[0018] like Figure 6 It is a schematic diagram of the telescopic column structure.

[0019] like Figure 7 It is a schematic diagram of the clamping jaw structure. DETAILED DESCRIPTION

[0020] In order to further understand the content of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings.

[0021] A self-locking variable diameter sleeve capable of forward and reverse rotation comprises an outer cylinder 10, an inner cylinder 20 disposed in the outer cylinder 10, a telescopic column 30 disposed in the inner cylinder 20, and a clamping claw 40 disposed on the telescopic column 30;

[0022] The outer cylinder 10 is a hollow cylinder with one end open and the other end closed. Three identical concave blocks 11 are evenly distributed on the inner wall of the outer cylinder 10. The surface of the concave block 11 facing the center of the cylinder is V-shaped. An axial hole 12 is provided at the center of the inner side surface of the closed end of the outer cylinder 10. A connector 50 that cooperates with an electric wrench is provided at the center of the outer side surface of the closed end of the outer cylinder 10.

[0023] The inner cylinder 20 is a hollow cylinder with one end open and the other end closed. A central axis 21 protrudes outward from the center of the closed end. The inner cylinder 20 is rotatably arranged in the outer cylinder 10 by cooperating with the shaft hole 12 of the outer cylinder 10 through the central axis 21. Three through holes 22 are evenly arranged along the cylinder wall of the open end of the inner cylinder 20. The shape of the through holes 22 matches the clamping claw 40. A column hole 23 is arranged at the center of the closed end of the inner cylinder 20. The column hole 23 extends to the inside of the central axis 21.

[0024] One end of the telescopic column 30 extends into the column hole 23, and the other end is provided with a center hole 31 and three connecting blocks 32. A first spring 33 is provided in the center hole 31, and a contact 34 is provided at the outer end of the first spring 33. The contact 34 extends out of the center hole 31. A second spring 35 is sleeved on the telescopic column 30, and the two ends of the second spring 35 are respectively pressed against the inner cylinder 20 and the connecting block 32, and the stiffness of the second spring 35 is less than that of the first spring 33.

[0025] There are three clamping jaws 40, which are respectively embedded in the three through holes 22 of the inner cylinder 20. The top ends of the three clamping jaws 40 are hinged to the three connecting blocks 32 through levers. The outer side walls of the clamping jaws 40 are provided with convex surfaces 41 matching the concave blocks 11. When the outer cylinder 10 rotates forward and reverse, the concave blocks 11 of the outer cylinder 10 abut against the convex surfaces 41 of the clamping jaws 40 and squeeze the clamping jaws 40 radially.

Claims

1. A self-locking variable diameter sleeve capable of forward and reverse rotation, comprising an outer cylinder, an inner cylinder arranged in the outer cylinder, a telescopic column arranged in the inner cylinder, and a clamping claw arranged on the telescopic column, wherein: The outer cylinder is a hollow cylinder with one end open and the other end closed. Three identical concave blocks are evenly distributed on the inner wall of the outer cylinder. The surface of the concave blocks facing the center of the cylinder is V-shaped. An axial hole is provided at the center of the inner side surface of the closed end of the outer cylinder. The inner cylinder is a hollow cylinder with one end open and the other end closed. A central axis protrudes outward from the center of the closed end. The inner cylinder is rotatably arranged in the outer cylinder through the central axis and the axial hole of the outer cylinder. Three through holes are evenly arranged along the cylinder wall of the open end of the inner cylinder. The shape of the through holes matches the clamping claw. A column hole is arranged at the center of the closed end of the inner cylinder, and the column hole extends to the inside of the central axis. One end of the telescopic column extends into the column hole, and the other end is provided with a center hole and three connecting blocks. A first spring is provided in the center hole, and a contact is provided at the outer end of the first spring. The contact extends out of the center hole. A second spring is sleeved on the telescopic column, and the two ends of the second spring are respectively against the inner cylinder and the connecting block, and the stiffness of the second spring is less than that of the first spring. There are three clamping jaws, which are respectively embedded in the three through holes of the inner cylinder. The top ends of the three clamping jaws are hinged to the three connecting blocks through levers. The outer side walls of the clamping jaws are provided with convex surfaces matching the concave blocks. When the outer cylinder rotates forward and reversely, the concave blocks of the outer cylinder abut against the convex surfaces of the clamping jaws and squeeze the clamping jaws radially.

2. According to claim 1, a self-locking reducing sleeve capable of forward and reverse rotation is characterized in that: A connector matched with an electric wrench is arranged at the center of the outer side surface of the closed end of the outer cylinder.

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