Locking protection method for locking pliers

Abstract

The invention relates to the technical field of manual hardware tools, in particular to a locking protection method for locking pliers. Comprising a fixed jaw, a movable jaw, a fixed handle and a movable handle, the movable jaw is connected with the fixed handle through a rivet A, the movable jaw is connected with the movable handle through a rivet B, an adjusting screw makes contact with the rear end of a supporting plate, the front end of the supporting plate is connected with the movable handle through a rivet C, and a tension spring is arranged between the middle of the fixed handle and the movable jaw. A safety switch is arranged at the position, close to the front end of the supporting plate, in the movable handle, a damping compression spring is arranged between the side portion of the safety switch and the side wall of the movable handle, and the safety switch and the damping compression spring are connected with the movable handle through a rivet E. When a workpiece is clamped, after the notch of the safety switch makes contact with the front end of the supporting plate, the safety switch locks the locking pliers at the moment, the locking pliers cannot be opened no matter the handle is opened or in other modes, safety is achieved, the situation that the locking pliers are opened due to mistaken touch can be avoided, and potential safety hazards are eliminated.

Description

Technical fields:

[0001] This invention relates to the field of manual hardware tools, and more particularly to a locking and protection method for bolt cutters. Background technology:

[0002] Traditional bolt clamps, such as the patent application CN209599144U entitled "A Bolt Clamp Pliers with Ratchet Wrench Function," consist of a fixed jaw, a fixed handle, a movable jaw, a movable handle, a support plate, an opening handle, an adjusting bolt, a tension spring, and rivets. The fixed jaw and fixed handle are welded together. The movable jaw is connected to both the fixed and movable handles via rivets. The adjusting bolt is located at the end of the fixed handle. One end of the support plate is connected to the movable handle via a rivet, and the other end contacts the head of the adjusting bolt. The opening handle is connected to the movable handle via a rivet. The tension spring is hooked at both ends to the movable jaw and the fixed handle, respectively. When the movable handle is pressed, it uses one end of the support plate as a fulcrum to move the movable jaw, causing it to rotate and engage with the fixed jaw to clamp the workpiece. This traditional bolt clamp structure lacks any locking or protective mechanism. Accidental activation of the opening handle can cause the bolt clamp to open unintentionally. If a workpiece is clamped at a height, the bolt clamp and the workpiece could fall, posing a significant safety hazard.

[0003] In conclusion, how to achieve locking protection for bolt cutters has become a technical challenge that urgently needs to be solved in the industry. Summary of the Invention:

[0004] To overcome the shortcomings of the prior art, this invention provides a locking and protection method for bolt clamps, which solves the problem that the bolt clamps in the past lacked a locking and protection structure and were easily opened by accident, posing a safety hazard.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A locking protection method for bolt clamps, the bolt clamps include a fixed jaw, a movable jaw, a fixed handle, and a movable handle. The fixed jaw and the fixed handle are welded together. The movable jaw is connected to the fixed handle by rivet A and the movable jaw is connected to the movable handle by rivet B. The rear end of the fixed handle is provided with an adjusting screw that contacts the rear end of a support plate. The front end of the support plate is connected to the movable handle by rivet C. A tension spring is provided between the middle of the fixed handle and the movable jaw. The middle of the movable handle is connected to an opening handle by rivet D. A safety switch is provided inside the movable handle near the front end of the support plate. A damping spring is provided between the side of the safety switch and the side wall of the movable handle. The safety switch and the damping spring are connected to the movable handle by rivet E.

[0007] When clamping the workpiece, first push the safety switch to the locked position, then grip the movable handle to close the support plate. When the tail of the support plate, rivet C, and rivet B are in a straight line, the front end of the support plate is in contact with the safety switch, and the front end of the support plate cannot continue to move downward. At this time, the safety switch will lock the clamp.

[0008] When unlocking, first push the safety switch to rotate in the opposite direction, so that the safety switch is disengaged from the front end of the support plate. At this time, the safety switch is opened, and the front end of the support plate is no longer restricted by the safety switch. By opening the handle, the support plate is lifted up, so that the tail end of the support plate, rivet C, and rivet B are no longer in the same straight line. Under the reset action of the tension spring, the clamps are unlocked and the workpiece is released.

[0009] The safety switch has a notch at the top that matches the front end of the support plate.

[0010] The safety switch has an arc-shaped boss on its side that cooperates with the damping spring.

[0011] The bottom of the safety switch has anti-slip texture.

[0012] The damping spring is used to create resistance to the rotation of the safety switch.

[0013] The present invention adopts the above-described solution and has the following beneficial effects:

[0014] A safety switch is located inside the movable handle near the front end of the support plate. When clamping a workpiece, the safety switch notch contacts the front end of the support plate, locking the clamp. The clamp cannot be opened by opening the handle or by any other means, ensuring safety and preventing accidental opening of the clamp, thus eliminating safety hazards. After clamping, the safety switch is rotated to disengage from the front end of the support plate, freeing the support plate from restriction. Then, the clamp can be opened by opening the handle, releasing the workpiece. Attached image description:

[0015] Figure 1 This is a schematic diagram of the locking state structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the unlocked state structure of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the cooperation between the support plate and the safety switch of the present invention.

[0018] Figure 4 This is a schematic diagram of the damping compression spring of the present invention.

[0019] In the diagram, 1. Fixed jaws, 2. Movable jaws, 3. Fixed handle, 4. Movable handle, 5. Rivet A, 6. Rivet B, 7. Adjusting screw, 8. Support plate, 9. Rivet C, 10. Tension spring, 11. Rivet D, 12. Opening handle, 13. Safety switch, 14. Damping spring, 15. Rivet E, 16. Notch, 17. Arc-shaped boss, 18. Anti-slip texture. Detailed implementation method:

[0020] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0021] like Figure 1-4 As shown, a locking protection method for bolt cutters is described. The bolt cutters include a fixed jaw 1, a movable jaw 2, a fixed handle 3, and a movable handle 4. The fixed jaw 1 and the fixed handle 3 are welded together. The movable jaw 2 is connected to the fixed handle 3 by rivet A5 and to the movable handle 4 by rivet B6. An adjusting screw 7 is provided at the rear end of the fixed handle 3, which contacts the rear end of a support plate 8. The front end of the support plate 8 is connected to the movable handle 4 by rivet C9. The middle part of the fixed handle 3 is connected to the movable jaw 2. A tension spring 10 is provided between the two parts. The middle part of the movable handle 3 is connected to the opening handle 12 by a rivet D11. A safety switch 13 is provided inside the movable handle 4 near the front end of the support plate 8. The top of the safety switch 13 contacts the front end of the support plate 8 to lock the support plate 8. A damping spring 14 is provided between the side of the safety switch 13 and the side wall of the movable handle 4. A rivet E15 passes through the through hole on the safety switch 13 and the center hole of the damping spring 14 to connect the safety switch 13 and the damping spring 14 to the movable handle 4.

[0022] When clamping a workpiece, first push the safety switch 13 to the locked position, then grip the movable handle 4 to close the support plate 8. When the tail of the support plate 8, rivet C9, and rivet B6 are in a straight line, the front end of the support plate 8 is in contact with the safety switch 13. The front end of the support plate 8 cannot continue to move downward. At this time, the safety switch 13 locks the clamp.

[0023] When the lock is released, first push the safety switch 13 to rotate in the opposite direction, so that the safety switch 13 is disengaged from the front end of the support plate 8. At this time, the safety switch 13 is opened, and the front end of the support plate 8 is no longer restricted by the safety switch 13. By opening the handle 12, the support plate 8 is lifted up, so that the tail end of the support plate 8, rivet C9, and rivet B6 are no longer in the same straight line. Under the reset action of the tension spring 10, the clamp is unlocked and the workpiece is released.

[0024] The top of the safety switch 13 is provided with a notch 16 that matches the front end of the support plate 8. The shape of the notch 16 matches the shape of the front end of the support plate 8, which makes the top of the safety switch 13 contact the front end of the support plate 8 more tightly and stably, preventing slippage.

[0025] The safety switch 13 has an arc-shaped boss 17 on its side that cooperates with the damping spring 14. When installing the safety switch 13 and the damping spring 14 into the movable handle 4, the damping spring 14 can be pressed tightly on the safety switch 13 near the arc-shaped boss 17 first. Under the action of the arc-shaped boss 17, the damping spring 14 and the safety switch 13 are pushed into the movable handle 4 together. Then, the rivet E15 is passed through the through hole on the movable handle 4, the safety switch 13 and the damping spring 14. Finally, the two ends of the rivet E15 are pressed to complete the installation.

[0026] The bottom of the safety switch 13 is provided with anti-slip texture 18, which can prevent slipping when the safety switch 13 is rotated.

[0027] The damping spring 14 is used to resist the rotation of the safety switch 13. The safety switch 13 can only rotate under the action of external force, ensuring stability and reliability when locked, and preventing the safety switch 13 from rotating and disengaging from the front end of the support plate 8 when it is not subjected to external force, which would lead to locking failure.

[0028] Working principle:

[0029] When clamping a workpiece, first push the anti-slip texture 18 to rotate the safety switch 13 to the locked position, then grip the movable handle 4 to close the support plate 8. When the tail of the support plate 8, rivet C9, and rivet B6 are in a straight line, the front end of the support plate 8 is in contact with the notch 16 of the safety switch 13. The front end of the support plate 8 cannot continue to move downward. At this time, the safety switch 13 can lock the clamp. The clamp cannot be opened by opening the handle 12, which can prevent the clamp from being opened due to accidental contact and eliminate safety hazards.

[0030] When the clamping work is completed and the locking needs to be released, first push the anti-slip texture 18 to drive the safety switch 13 to rotate in the opposite direction, so that the notch 16 of the safety switch 13 is disengaged from the front end of the support plate 8. At this time, the safety switch 13 is open, and the front end of the support plate 8 is no longer restricted by the safety switch 13. By opening the handle 12, the support plate 8 is lifted up, so that the tail of the support plate 8, rivet C9, and rivet B6 are no longer in the same straight line. Under the reset action of the tension spring 10, the clamp is unlocked and the workpiece is released.

[0031] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0032] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A locking and protection method for bolt clamps, the bolt clamps comprising a fixed jaw, a movable jaw, a fixed handle, and a movable handle, wherein the fixed jaw and the fixed handle are welded together, the movable jaw is connected to the fixed handle via rivet A, the movable jaw is connected to the movable handle via rivet B, an adjusting screw is provided at the rear end of the fixed handle, the adjusting screw contacts the rear end of a support plate, the front end of the support plate is connected to the movable handle via rivet C, a tension spring is provided between the middle of the fixed handle and the movable jaw, and the middle of the movable handle is connected to the opening handle via rivet D, characterized in that: A safety switch is located inside the movable handle near the front end of the support plate. A damping spring is located between the side of the safety switch and the side wall of the movable handle. The safety switch and the damping spring are connected to the movable handle by rivet E. When clamping the workpiece, first push the safety switch to the locked position, then grip the movable handle to close the support plate. When the tail of the support plate, rivet C, and rivet B are in a straight line, the front end of the support plate is in contact with the safety switch, and the front end of the support plate cannot continue to move downward. At this time, the safety switch will lock the clamp. When unlocking, first push the safety switch to rotate in the opposite direction, so that the safety switch is disengaged from the front end of the support plate. At this time, the safety switch is opened, and the front end of the support plate is no longer restricted by the safety switch. By opening the handle, the support plate is lifted up, so that the tail end of the support plate, rivet C, and rivet B are no longer in the same straight line. Under the reset action of the tension spring, the clamps are unlocked and the workpiece is released.

2. The locking and protection method for bolt cutters according to claim 1, characterized in that: The safety switch has a notch at the top that matches the front end of the support plate.

3. The locking and protection method for bolt cutters according to claim 1, characterized in that: The safety switch has an arc-shaped boss on its side that cooperates with the damping spring.

4. The locking and protection method for bolt cutters according to claim 1, characterized in that: The bottom of the safety switch has anti-slip texture.

5. The locking and protection method for bolt cutters according to claim 1, characterized in that: The damping spring is used to create resistance to the rotation of the safety switch.

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