Labor-saving torque wrench

Abstract

To provide a labor-saving torque wrench that significantly reduces the difficulty of adjustment. [Solution] This labor-saving torque wrench comprises a torque wrench body, which includes a ratchet wrench, a main pipe, and a rotary handle. The ratchet wrench is attached to one end of the main pipe, and the rotary handle is threadably connected to the other end of the main pipe. A positioning cavity is provided within the main pipe for attaching a torsion spring. A pressure column is slidably mounted to the end of the main pipe remote from the ratchet wrench. A torque adjustment screw is fixed to the end of the rotary handle. A transmission steel ball is fixed to the center of one end of the torque adjustment screw facing the pressure column, and a positioning groove is provided on the end face of the pressure column for tightening the transmission steel ball. Instead of plane friction between the end face of the torque adjustment screw and the contact surface of the pressure column, friction is reduced by designing a point contact between the transmission steel column and the end face of the pressure column.

Description

[Technical Field]

[0001] This utility model relates to a new type of wrench, specifically a labor-saving torque wrench. [Background technology]

[0002] Torque wrenches, also known as torsion wrenches, are a type of wrench that can be divided into electric torque wrenches, pneumatic torque wrenches, hydraulic torque wrenches, and manual torque wrenches according to their power source. Torque wrenches allow an operator to apply a specific torque value.

[0003] When using a conventional torque wrench, the torque wrench adjusts the tension of the internal spring by rotating the rotary handle to tighten or loosen the thread, thereby changing the force value and further adjusting the torque magnitude. During the tightening and loosening process, the end face of the torque adjusting screw comes into contact with the end face of the pressure column, and the rotation of the rotary handle drives the torque adjusting screw, pushing the pressure column forward. The pressure column, positioned by the locating pin, moves axially and presses the spring.

[0004] Although the torque wrench described above can realize the transmission movement of the pressure column, the large planar friction force between the end face of the torque adjustment screw and the contact surface of the pressure column makes adjustment time-consuming. Summary of the Invention [Problem to be solved by the invention]

[0005] The purpose of this utility model is to provide a labor-saving torque wrench to solve the problem that, although conventional torque wrenches can transmit movement of the pressure column, the planar friction force between the end face of the torque adjustment screw and the contact surface of the pressure column is large, making adjustment time-consuming. [Means for solving the problem]

[0006] In order to achieve the above object, the present utility model provides a labor-saving torque wrench, which comprises a torque wrench body, which comprises a ratchet wrench, a main pipe, and a rotary handle, wherein the ratchet wrench is attached to one end of the main pipe, the rotary handle is threadedly connected to the other end of the main pipe, a positioning cavity is provided within the main pipe for mounting a torsion spring, a pressure column is slidably mounted on one end of the main pipe away from the ratchet wrench, and a rod is attached to the end of the rotary handle. A lock nut is fixed, a setting screw is threadedly attached to the lock nut, one end of the setting screw is inserted inside the rotating handle and a spacer is rotatably connected to it, multiple sets of positioning needles are fixedly attached to the side of the spacer facing the pressure column, and the corresponding end surface of the pressure column is provided with positioning teeth surfaces for the positioning needles to abut and lock, a torque adjustment screw is fixed to the end of the rotating handle, a transmission steel ball is fixed to the center of one end of the torque adjustment screw facing the pressure column, and the end surface of the pressure column is provided with a positioning groove for tightening the transmission steel ball.

[0007] In a further aspect of the present invention, the set screw has an end fitted with a rotating cap for manual turning.

[0008] In a further aspect of the present invention, a Karp spring is provided at the end of the main pipe.

[0009] In a further aspect of the present invention, a positioning pin is fixed to the side surface of the pressure column, and a positioning groove is provided in the side wall of the main pipe for the positioning pin to slide into.

[0010] Compared with the prior art, instead of the planar friction force between the end face of the torque adjustment screw and the contact surface of the pressure column, this utility model designs a point contact between the transmission steel column and the end face of the pressure column, thereby reducing the friction force and significantly reducing the difficulty of adjustment. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a structural schematic diagram of the labor-saving torque wrench of this utility model. [Figure 2] FIG. 2 is an enlarged view of the rear structure of the labor-saving torque wrench of this utility model. [Explanation of symbols]

[0012] 001, ratchet wrench; 002, main pipe; 003, rotary handle; 004, positioning pin; 005, torque adjustment screw; 006, positioning needle; 007, lock nut; 008, positioning screw; 009, spacer; 010, pressure column; 011, spring; 012, Karp spring; 013, transmission steel ball. DETAILED DESCRIPTION OF THE INVENTION

[0013] The technical solution of this utility model will be described in more detail below with reference to specific embodiments.

[0014] As shown in Figures 1 and 2, an embodiment of the present invention is a labor-saving torque wrench, the labor-saving torque wrench comprising a torque wrench body, the torque wrench body comprising a ratchet wrench 001, a main pipe 002, and a rotary handle 003, the ratchet wrench 001 is attached to one end of the main pipe 002, the rotary handle 003 is threadedly connected to the other end of the main pipe 002, a mounting cavity for mounting a torsion spring 011 is provided within the main pipe 002, a pressure column 010 is slidably mounted on one end of the main pipe 002 remote from the ratchet wrench 001, and a lock nut is attached to the end of the rotary handle 003. 007 is fixed, a setting screw 008 is threadedly attached to the lock nut 007, one end of the setting screw 008 is inserted inside the rotating handle 003 and a spacer 009 is rotatably connected to the spacer 009, multiple sets of positioning needles 006 are fixedly attached to the side facing the pressure column 010, and the corresponding end face of the pressure column 010 is provided with positioning teeth surfaces for the positioning needles 006 to abut and lock into, a torque adjustment screw 005 is fixed to the end of the rotating handle 003, a transmission steel ball 013 is fixed to the center of the one end of the torque adjustment screw 005 facing the pressure column 010, and a positioning groove is provided on the end face of the pressure column 010 for tightening the transmission steel ball 013.

[0015] Specifically, the basic operating principle of this utility model is as follows.

[0016] 1. The torque wrench adjusts the force value by rotating the rotary handle 003 through the tightening and loosening of the thread, thereby adjusting the tightening of the internal spring and further adjusting the torque magnitude.

[0017] 2. Rotate the positioning screw 008 to drive the positioning needle 006 and the upper part of the pressure column 010 to separate from each other. At this time, unlock the rotary handle 003 and the pressure column 010. Through the rotation of the rotary handle 003, drive the transmission steel ball 013 to press the pressure column 010, thereby moving the pressure column 010 linearly in the axial direction and pressing the spring 011.

[0018] 3. After adjusting the torque, rotate the positioning screw 008 to press the positioning pin 006 against the positioning tooth surface of the pressure column 010 to position it, thereby completely locking the rotating handle 003 and the pressure column 010 together.

[0019] As shown in Figures 1 and 2, in an embodiment of the present invention, a rotating cap is attached to the end of the set screw 008 for a person to turn, making it easier for a person to rotate the set screw 008.

[0020] As shown in FIGS. 1 and 2, in this embodiment of the present invention, a carb spring 012 is provided at the end of the main pipe 002.

[0021] As shown in Figures 1 and 2, in an embodiment of the present utility model, a positioning pin 004 is fixed to the side of the pressure column 010, and a positioning groove is provided on the side wall of the main pipe 002 for the positioning pin 004 to slide into. During the process of tightening or loosening the rotary handle 003, the pressure column 010 is pushed forward by the rotation, and the pressure column 010 is positioned by the positioning pin 004 and can only move in the axial direction.

[0022] In short, instead of the planar friction force between the end face of the torque adjustment screw 005 and the contact surface of the pressure column 010, this utility model designs a point contact between the transmission steel column and the end face of the pressure column 010, thereby reducing the friction force and greatly reducing the difficulty of adjustment.

[0023] The above describes in detail preferred embodiments of the present utility model, but the present utility model is not limited to the above embodiments, and various modifications can be made within the scope of knowledge possessed by a person skilled in the art, provided that they do not deviate from the spirit of the present utility model.

Claims

1. a torque wrench body including a ratchet wrench, a main pipe, and a rotary handle; the ratchet wrench is attached to one end of the main pipe, the rotary handle is threadedly connected to the other end of the main pipe, a positioning cavity is provided within the main pipe for attaching a torsion spring; a pressure column is slidably mounted to one end of the main pipe remote from the ratchet wrench; a lock nut is fixed to one end of the rotary handle, a set screw is threadedly attached to the lock nut, one end of the set screw is inserted into the rotary handle and a spacer is rotatably connected to the set screw, a plurality of sets of positioning pins are fixedly attached to the side of the spacer facing the pressure column, and the corresponding end face of the pressure column is provided with locating teeth for abutting and locking the positioning pins; a torque adjustment screw is fixed to the end of the rotary handle, a transmission steel ball is fixed to the center of one end of the torque adjustment screw facing the pressure column, and a locating groove is provided on the end face of the pressure column for tightening the transmission steel ball.

2. 2. The labor-saving torque wrench according to claim 1, wherein a rotating cap for manual rotation is attached to the end of the set screw.

3. 2. The labor-saving torque wrench according to claim 1, wherein a Karp spring is provided at an end of the main pipe.

4. 2. The labor-saving torque wrench according to claim 1, wherein a positioning pin is fixed to a side surface of the pressure column, and a positioning groove is provided in the side wall of the main pipe for the positioning pin to be slidably mounted therein.

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