A method for quickly and labor-savingly opening a locking pliers

Abstract

The present invention relates to the technical field of manual hardware tools, and particularly relates to a method for quickly and labor-savingly opening a locking plier. The movable jaw is riveted to the fixed handle and the connecting plate respectively through rivet A and rivet B and can rotate freely. The other end of the connecting plate is riveted to the support plate through rivet C and can rotate freely. A cavity for accommodating the support plate is provided inside the connecting plate, and a cam cooperating with the support plate is arranged in the cavity. The connecting plate is arranged in the cavity of the movable handle, and the movable handle, the connecting plate and the cam are connected through a rotating pin. An unlocking pin penetrates through the movable handle, and an arc-shaped groove and a protruding part cooperating with the unlocking pin are arranged on the side of the connecting plate. When clamping a workpiece, the cooperation between the unlocking pin and the arc-shaped groove can realize the locking of the connecting plate. When the unlocking pin is pressed, the unlocking pin loses the restriction on the protruding part, thereby unlocking the connecting plate. Rotating the movable handle drives the cam to rotate, and the cam jacks up the support plate to realize unlocking. The operation is simple and convenient, and the accidental touch to open the locking plier can be avoided.

Description

Technical field:

[0001] The invention relates to the technical field of manual hardware tools, in particular to a method for quickly and labor-saving opening of locking pliers. Background technology:

[0002] Conventional locking pliers, such as the patent application CN209599144U, entitled "A Type of Locking Pliers with Ratchet Wrench Function," generally consist of a fixed jaw, a fixed handle, a movable jaw, a movable handle, a support plate, a lifter, an adjustment bolt, a tension spring, and rivets. The fixed jaw and the fixed handle are welded together, while the movable jaw, the fixed handle, and the movable handle are connected together by rivets. The adjustment bolt is located at the rear of the fixed handle. One end of the support plate is connected to the movable handle by rivets, while the other end contacts the head of the adjustment bolt. When the movable handle is pressed, the movable jaw, with one end of the support plate as a fulcrum, rotates and clamps the workpiece with the fixed jaw. These conventional locking pliers require the lifter to open the jaws, which is cumbersome to operate. Furthermore, the lifter lacks a locking mechanism, making it easy for the lifter to accidentally touch the jaw, causing the pliers to open.

[0003] In summary, how to achieve the problem of quick and effortless opening of locking pliers has become a technical problem that urgently needs to be solved in the industry. Summary of the invention:

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a method for quickly and labor-savingly opening locking pliers, which solves the problem that the lifting pieces of the locking pliers are difficult to operate and are easy to be accidentally touched and opened.

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

[0006] A method for quickly and labor-savingly opening locking pliers comprises a fixed jaw, a movable jaw, a fixed handle, a movable handle, a tension spring, a support plate and an adjusting bolt. The fixed jaw is welded to the front end of the fixed handle, and the adjusting bolt is connected to the rear end of the fixed handle via a thread. The movable jaw is riveted to the fixed handle and the connecting plate via rivets A and B respectively and can rotate freely. The other end of the connecting plate is riveted to the support plate via rivet C and can rotate freely. The movable handle and the connecting plate are connected via a rotating pin. A cam is provided in the middle of the rotating pin to cooperate with the support plate. An unlocking pin is provided between the movable handle and the connecting plate.

[0007] When clamping the workpiece, the unlocking pin cooperates with the connecting plate to lock the connecting plate. When the movable handle is turned, the connecting plate is driven to rotate. The tail of the support plate is clamped into the fixed handle and pressed against the head of the adjusting bolt. When the tail of the support plate, rivet C, and rivet B are in the same straight line, the front end of the support plate is clamped at the minimum diameter point of the cam to generate a lock. At this time, the pliers are locked.

[0008] When the unlocking pin is pressed, the unlocking pin loses its restriction on the connecting plate. When the movable handle is rotated, the connecting plate does not rotate, but the movable handle drives the cam to rotate through the rotating pin. The point with the maximum diameter of the cam jacks up the support plate, so that the tail of the support plate, rivet C, and rivet B are no longer on the same straight line, and unlocking is achieved under the reset action of the tension spring.

[0009] A cavity for accommodating the support plate is provided inside the connecting plate, and a cam cooperating with the support plate is provided in the cavity. The connecting plate is arranged in the cavity of the movable handle, and the movable handle, connecting plate, and cam are connected through a rotating pin.

[0010] An unlocking pin penetrates through the movable handle, and an arc-shaped groove and a convex part cooperating with the unlocking pin are provided on the side of the connecting plate.

[0011] The rotating pin is a special-shaped pin. A hole with the same shape as the rotating pin is provided in the middle of the cam, and a hole with the same shape as the rotating pin is provided on the movable handle. When the movable handle is rotated, the cam is driven to rotate through the rotating pin.

[0012] The hole on the connecting plate corresponding to the rotating pin is a round hole, and the diameter of the round hole is the same as the circumscribed circle of the rotating pin, and the rotating pin does not drive the connecting plate to rotate.

[0013] The unlocking pin is a push-type unlocking pin, which is movably installed in the round hole of the movable handle. The shaft diameters at both ends of the unlocking pin are thick, and the shaft diameter in the middle is thin. A boss and a spring are provided at one end, and a snap ring is provided at the other end.

[0014] In the initial position, the arc-shaped groove on the side of the connecting plate cooperates with the thick shaft diameter position of the unlocking pin, and when the movable handle is rotated, the connecting plate is driven to rotate at the same time.

[0015] When the unlocking pin is pressed, the convex part on the side of the connecting plate cooperates with the thin shaft diameter position of the unlocking pin, and the connecting plate does not rotate when the movable handle is rotated.

[0016] Both ends of the rotating pin are installed with torsion springs, and both ends of the torsion springs are in contact with the movable handle and the connecting plate respectively.

[0017] The present invention adopts the above scheme and has the following beneficial effects:

[0018] By arranging an unlocking pin in the movable handle and providing an arc-shaped groove and a convex part cooperating with the unlocking pin on the side of the connecting plate, when clamping a workpiece, the unlocking pin cooperating with the arc-shaped groove can lock the connecting plate. When the unlocking pin is pressed, the unlocking pin loses its restriction on the convex part, thereby unlocking the connecting plate. Rotating the movable handle drives the cam to rotate, and the cam jacks up the support plate to achieve unlocking. The operation is simple and can avoid the large pliers from being opened due to accidental touch. Description of the drawings:

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2Schematic diagram of the locking state of the present invention.

[0021] Figure 3 Schematic diagram of the unlocking state of the present invention.

[0022] Figure 4 Stereo structure diagram of the cam, support plate, connecting plate and movable handle of the present invention.

[0023] Figure 5 Stereo structure diagram of the connecting plate and the unlocking pin part of the present invention.

[0024] Figure 6 Stereo structure diagram of the movable handle of the present invention.

[0025] Figure 7 Stereo structure diagram of the cam of the present invention.

[0026] Figure 8 Stereo structure diagram of the unlocking pin part of the present invention.

[0027] In the figure, 1, fixed jaw; 2, movable jaw; 3, fixed handle; 4, movable handle; 5, tension spring; 6, support plate; 7, adjusting bolt; 8, rivet A; 9, rivet B; 10, rivet C; 11, connecting plate; 12, cam; 13, rotating pin; 14, unlocking pin; 15, arc groove; 16, convex part; 17, boss; 18, spring; 19, snap ring; 20, torsion spring. Specific implementation mode:

[0028] To clearly illustrate the technical features of this solution, the present invention will be elaborated in detail below through specific implementation modes and in conjunction with its accompanying drawings.

[0029] As Figure 1-8 shown, a method for quickly and labor-saving opening of a powerful clamp includes a fixed jaw 1, a movable jaw 2, a fixed handle 3, a movable handle 4, a tension spring 5, a support plate 6 and an adjusting bolt 7. The front end of the fixed handle 3 is welded with the fixed jaw 1, and the adjusting bolt 7 is threadedly connected to the tail of the fixed handle 3. The movable jaw 2 is riveted to the fixed handle 3 and the connecting plate 11 respectively through rivet A 8 and rivet B 9 and can rotate freely. The other end of the connecting plate 11 is riveted to the support plate 6 through rivet C 10 and can rotate freely. The movable handle 4 and the connecting plate 11 are connected through a rotating pin 13. A cam 12 cooperating with the support plate 6 is provided in the middle of the rotating pin 13. An unlocking pin 14 is provided between the movable handle 4 and the connecting plate 11;

[0030] When clamping the workpiece, the unlocking pin 14 and the connecting plate 11 cooperate to lock the connecting plate 11. When the movable handle 4 is rotated, it drives the connecting plate 11 to rotate. The tail of the support plate 6 is stuck into the fixed handle 3 and abuts against the head of the adjusting bolt 7. When the tail of the support plate 6, the rivet C10, and the rivet B9 are in the same straight line, the front end of the support plate 6 is stuck at the minimum diameter point of the cam 12 to generate locking, and at this time the locking pliers are locked.

[0031] When the unlocking pin is pressed, the unlocking pin 14 loses the restriction on the connecting plate 11. When the movable handle 4 is rotated, the connecting plate 11 does not rotate, and the movable handle 4 drives the cam 12 to rotate through the rotating pin 13. The maximum diameter point of the cam 12 jacks up the support plate 6, so that the tail of the support plate 6, the rivet C10, and the rivet B9 are no longer in the same straight line, and unlocking is achieved under the reset action of the tension spring 5.

[0032] A cavity for accommodating the support plate 6 is provided in the connecting plate 11, and a cam 12 cooperating with the support plate 6 is provided in the cavity. The connecting plate 11 is arranged in the cavity of the movable handle 4, and the movable handle 4, the connecting plate 11, and the cam 12 are connected by a rotating pin 13.

[0033] An unlocking pin 14 is penetrated through the movable handle 4, and an arc-shaped groove 15 and a convex part 16 cooperating with the unlocking pin 14 are provided on the side of the connecting plate 11.

[0034] The rotating pin 13 is a special-shaped pin. A hole with the same shape as the rotating pin 13 is provided in the middle of the cam 12. Two groups of through holes are processed on the movable handle 4, one group corresponding to the rotating pin 13 and the other group corresponding to the unlocking pin 14. A hole with the same shape as the rotating pin 13 is provided on the movable handle 4, and when the movable handle 4 is rotated, the cam 12 is driven to rotate through the rotating pin 13.

[0035] Three groups of through holes are processed on the connecting plate 11, two of which correspond to the rivet B9 and the rivet C10, and the other group corresponds to the rotating pin 13. The hole on the connecting plate 11 corresponding to the rotating pin 13 is a round hole, and the diameter of the round hole is the same as the circumscribed circle of the rotating pin 13, and the rotating pin 13 does not drive the connecting plate 11 to rotate.

[0036] The unlocking pin 14 is a press-type unlocking pin, which is movably installed in the round hole of the movable handle 4. The shaft diameters at both ends of the unlocking pin 14 are thick, and the shaft diameter in the middle is thin. A boss 17 and a spring 18 are provided at one end, and a snap ring 19 is provided at the other end.

[0037] In the initial position, the arc-shaped groove 15 on the side of the connecting plate 11 cooperates with the thick shaft diameter position of the unlocking pin 14, and when the movable handle 4 is rotated, it drives the connecting plate 11 to rotate at the same time.

[0038] When the unlocking pin 14 is pressed, the convex part 16 on the side of the connecting plate 11 cooperates with the thin shaft diameter position of the unlocking pin 14, and when the movable handle 4 is rotated, the connecting plate 11 does not rotate.

[0039] Torsion springs 20 are installed at both ends of the pin 13. The two ends of the torsion springs 20 are respectively in contact with the movable handle 4 and the connecting plate 11, so that the movable handle 4 and the connecting plate 11 maintain a certain initial angle.

[0040] Working principle:

[0041] When clamping a workpiece, the thick part of the shaft diameter of the unlocking pin 14 is stuck in the arc-shaped groove 15 on the side of the connecting plate 11. The unlocking pin 14 restricts the arc-shaped groove 15 and the convex part 16. At this time, rotating the movable handle 4 can drive the connecting plate 11 to rotate simultaneously. The tail of the support plate 6 is stuck into the fixed handle 3 and abuts against the head of the adjusting bolt 7. When the tail of the support plate 6, the rivet C10, and the rivet B9 are in the same straight line, the front end of the support plate 6 just gets stuck at the minimum diameter point of the cam 12 to generate locking. At this time, the locking pliers can be locked; when pressing the unlocking pin 14, the thick part of the shaft diameter of the unlocking pin 14 can slide out of the arc-shaped groove 15. Since the middle diameter of the unlocking pin 14 is smaller, the restriction on the convex part 16 is lost. At this time, when rotating the movable handle 4, the connecting plate 11 does not rotate, and the movable handle 4 drives the cam 12 to rotate through the pin 13. The maximum diameter point of the cam 12 jacks up the support plate 6, so that the tail of the support plate 6, the rivet C10, and the rivet B9 are no longer in the same straight line, and unlocking is achieved under the reset action of the tension spring 5.

[0042] The above specific implementation manners cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art of this technology, any alternative improvement or transformation made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0043] The parts not detailed in the present invention are all well-known technologies to those skilled in the art of this technology.

Claims

1. A method for quickly and labor-savingly opening locking pliers, comprising a fixed jaw, a movable jaw, a fixed handle, a movable handle, a tension spring, a support plate, and an adjusting bolt. The fixed jaw is welded to the front end of the fixed handle, and the adjusting bolt is threadedly connected to the rear end of the fixed handle. The pliers are characterized by: The movable jaw is riveted to the fixed handle and the connecting plate by rivets A and B respectively and can rotate freely. The other end of the connecting plate is riveted to the support plate by rivet C and can rotate freely. The movable handle and the connecting plate are connected by a rotating pin. A cam that cooperates with the support plate is provided in the middle of the rotating pin. An unlocking pin is provided between the movable handle and the connecting plate. When clamping the workpiece, the unlocking pin cooperates with the connecting plate to lock the connecting plate. When the movable handle is turned, the connecting plate is driven to rotate. The tail of the support plate is clamped into the fixed handle and pressed against the head of the adjusting bolt. When the tail of the support plate, rivet C, and rivet B are in the same straight line, the front end of the support plate is clamped at the minimum diameter point of the cam to generate a lock. At this time, the pliers are locked. When the unlocking pin is pressed, the unlocking pin loses its restriction on the connecting plate. When the movable handle is turned, the connecting plate does not turn, and the movable handle drives the cam to rotate through the rotating pin. The maximum diameter point of the cam lifts the support plate, so that the tail of the support plate, rivet C and rivet B are no longer in the same straight line, and unlocking is achieved under the reset action of the tension spring; The connecting plate is provided with a groove cavity for accommodating the support plate, the groove cavity is provided with a cam that cooperates with the support plate, the connecting plate is provided in the groove cavity of the movable handle, and the movable handle, the connecting plate and the cam are connected by a rotating pin; The rotating pin is a special-shaped pin, a hole having the same shape as the rotating pin is provided in the middle of the cam, and a hole having the same shape as the rotating pin is provided on the movable handle. When the movable handle is rotated, the rotating pin drives the cam to rotate; The hole on the connecting plate corresponding to the rotating pin is a circular hole, the diameter of the circular hole is consistent with the circumscribed circle of the rotating pin, and the rotating pin will not drive the connecting plate to rotate.

2. The method for quickly and labor-savingly opening locking pliers according to claim 1, characterized in that: An unlocking pin is provided through the movable handle, and an arc groove and a protrusion that match the unlocking pin are provided on the side of the connecting plate.

3. The method for quickly and labor-savingly opening locking pliers according to claim 1, characterized in that: The unlocking pin is a push-type unlocking pin, which is movably installed in the circular hole of the movable handle. The unlocking pin has a thick shaft diameter at both ends and a thin shaft diameter in the middle. One end is provided with a boss and a spring, and the other end is provided with a retaining spring.

4. The method for quickly and labor-savingly opening locking pliers according to claim 3, characterized in that: In the initial position, the arc groove on the side of the connecting plate matches the thick position of the unlocking pin shaft, and rotating the movable handle drives the connecting plate to rotate at the same time.

5. The method for quickly and labor-savingly opening locking pliers according to claim 4, characterized in that: When the unlocking pin is pressed, the raised portion on the side of the connecting plate is matched with the thinner portion of the unlocking pin shaft diameter, and the connecting plate does not rotate when the movable handle is turned.

6. The method for quickly and labor-savingly opening locking pliers according to claim 1, characterized in that: Torsion springs are installed at both ends of the rotating pin, and both ends of the torsion spring are in contact with the movable handle and the connecting plate respectively.

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