bolt and nut spanner

Abstract

The utility model discloses a bolt nut head spanner, including reverse hook arm, lever arm, movable pin and tension spring, the reverse hook arm middle part and lever arm middle part articulate, and the reverse hook arm front part forms the containing space of bolt outer hexagonal head with lever arm front part, and the reverse hook arm rear part is connected through tension spring between lever arm rear part. After installing the bolt nut head spanner, the handle portion of the rear end of lever arm is held clockwise or counterclockwise rotation, and after rotating a certain angle, reverse rotation is carried out again, and the reverse hook arm will be opened automatically under the action of hexagonal head convex position, and after rotating a certain angle in reverse, the reverse hook arm is embraced again under the pulling of tension spring, and the process is repeated until the bolt is tightened or loosened, which is simple in structure and convenient to operate.

Description

Technical Field

[0001] This utility model relates to a bolt and nut head wrench. Background Technology

[0002] When using existing standard open-end bolt wrenches for installation, the cross-flat width A of the bolt's hexagonal head needs to be adjusted. Figure 1 As shown, tightening and loosening can only be done with a certain tool, resulting in low efficiency. Although hex wrenches are more efficient, each type of external hex head requires a matching internal hex head, making the tool inconvenient to carry. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a bolt and nut head wrench that is simple in structure, easy to operate, and has a wide range of applications.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is: a bolt and nut head wrench, including a reverse hook arm, a lever arm, a movable pin and a tension spring. The middle part of the reverse hook arm and the middle part of the lever arm are hinged together. The front part of the reverse hook arm and the front part of the lever arm form a space for receiving the hexagonal head of the bolt. The rear part of the reverse hook arm and the rear part of the lever arm are connected by a tension spring.

[0005] The aforementioned bolt and nut wrench includes a hook arm body, the front end of which is bent outward and then backward to form a hook.

[0006] The aforementioned bolt and nut wrench has a first pin hole in the middle of the reverse hook arm body.

[0007] The aforementioned bolt and nut wrench includes a lever arm body with the front end of the lever arm body bent outward to form a bent portion. The orientation of the bent portion is opposite to the orientation of the hook portion of the reverse hook arm, so as to form a space for accommodating the hexagonal head of the bolt.

[0008] The aforementioned bolt and nut wrench has a second pin hole in the middle of the lever arm body. The pin passes through the first pin hole and the second pin hole to hinge the middle of the hook arm and the middle of the lever arm.

[0009] The aforementioned bolt and nut wrench has a mounting pin on the lever arm body, one end of the tension spring is fixed to the mounting pin, and the other end of the tension spring is fixed to the rear end of the reverse hook arm body.

[0010] The beneficial effects of this utility model are as follows: This utility model utilizes the action of a movable curved arm lever. The fulcrum acts on one side of the bolt's hexagonal head through the reverse hook arm. The tension spring pulls the reverse hook arm to keep it "clamping" the edge of the bolt's hexagonal head. The resistance point acts on the other side of the bolt's hexagonal head. When the wrench is tightened, the reverse hook arm pulls the edge of the bolt's hexagonal head through the movable pin, and the force acting on the resistance point drives the bolt's hexagonal head to rotate through the lever arm, thus realizing the tightening and loosening of the bolt's hexagonal head. It has the advantages of simple structure, convenient operation, and wide applicability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the operation of a standard bolt open-end wrench.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] Figure 3 for Figure 2 A schematic diagram of the structure of the anti-hook arm.

[0014] Figure 4 for Figure 2 A schematic diagram of the middle lever arm.

[0015] Figure 5 This is a schematic diagram illustrating the working principle of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 2 As shown, a bolt and nut head wrench includes a reverse hook arm 1, a lever arm 2, a movable pin 3, and a tension spring 4. The middle part of the reverse hook arm 1 and the middle part of the lever arm 2 are hinged together. The front part of the reverse hook arm 1 and the front part of the lever arm 2 form a space for receiving the hexagonal head 5 of the bolt. The rear part of the reverse hook arm 1 and the rear part of the lever arm 2 are connected by the tension spring 4.

[0018] like Figure 3 As shown, the reverse hook arm 1 includes a reverse hook arm body 6. The front end of the reverse hook arm body 6 is bent outward and then bent backward to form a hook part 7. A first pin hole 8 is opened in the middle of the reverse hook arm body 6.

[0019] like Figure 4As shown, the lever arm 2 includes a lever arm body 9. The front end of the lever arm body 9 is bent outward to form a bent portion 10. The orientation of the bent portion 10 is opposite to the orientation of the hook portion 7 of the reverse hook arm 1, so as to form a receiving space for the hexagonal head 5 of the bolt. A second pin hole 11 is opened in the middle of the lever arm body 9. The pin passes through the first pin hole 8 and the second pin hole 11 to hinge the middle of the reverse hook arm 1 and the middle of the lever arm 2. A mounting pin 12 is provided on the lever arm body 9. One end of the tension spring 4 is fixed to the mounting pin 12, and the other end of the tension spring 4 is fixed to the rear end of the reverse hook arm body 6.

[0020] like Figure 5 As shown, Figure 5 Two straight arrows indicate the direction of torque, and one curved arrow indicates the direction of wrench rotation. When using the wrench, after installing the bolt and nut head, hold the handle at the rear end of lever arm 2 and rotate clockwise (tightening) or counterclockwise (loosening). After rotating a certain angle, rotate in the opposite direction. Due to the action of the protruding position of the hexagonal head, the reverse hook arm 1 will automatically open. After rotating in the opposite direction for a certain angle, the tension spring 4 pulls the reverse hook arm 1 to "grip" the edge of the hexagonal head 5 of the bolt. Repeat this process until the bolt is tightened or loosened.

[0021] This utility model utilizes the action of a movable curved arm lever. The fulcrum (the bent part 10 at the front end of the lever arm body 9) acts on one side of the bolt's outer hexagonal head 5 through the reverse hook arm 1. The tension spring 4 pulls the reverse hook to keep it "clutching" the edge of the bolt's outer hexagonal head 5. The resistance point (the hook part 7 of the reverse hook arm 1) acts on the other side of the bolt's outer hexagonal head 5. When the force point (hand grip position) is used to tighten the wrench, the reverse hook arm 1 pulls the edge of the bolt's outer hexagonal head 5 through the movable pin 3, and the force from the resistance point, through the lever arm 2, drives the bolt's outer hexagonal head 5 to rotate, thus realizing the tightening and loosening of the bolt's outer hexagonal head 5.

Claims

1. A bolt and nut head wrench, characterized in that: It includes a reverse hook arm, a lever arm, a movable pin, and a tension spring. The middle parts of the reverse hook arm and the middle parts of the lever arm are hinged together. The front part of the reverse hook arm and the front part of the lever arm form a space for receiving the hexagonal head of the bolt. The rear part of the reverse hook arm and the rear part of the lever arm are connected by a tension spring.

2. The bolt and nut head wrench according to claim 1, characterized in that: The reverse hook arm includes a reverse hook arm body, the front end of which bends outward and then backward to form a hook.

3. The bolt and nut head wrench according to claim 2, characterized in that: The anti-hook arm body has a first pin hole in the middle.

4. The bolt and nut head wrench according to claim 2, characterized in that: The lever arm includes a lever arm body, the front end of which is bent outward to form a bent portion. The orientation of the bent portion is opposite to the orientation of the hook portion of the reverse hook arm, so as to form a receiving space for the hexagonal head of the bolt.

5. The bolt and nut head wrench according to claim 4, characterized in that: The lever arm body has a second pin hole in the middle, and the pin passes through the first pin hole and the second pin hole to hinge the middle of the hook arm and the middle of the lever arm.

6. The bolt and nut head wrench according to claim 4, characterized in that: The lever arm body is provided with a mounting pin, one end of the tension spring is fixed to the mounting pin, and the other end of the tension spring is fixed to the rear end of the reverse hook arm body.

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