Rotational locking force method for f-clip

Abstract

The present application relates to the technical field of manual hardware tools, and particularly relates to a rotating locking force adding method of F clamp. The F clamp comprises a main body, a moving jaw, a screw rod, a ball head, a pressure foot, a ratchet, a handle, a locking claw and an unlocking button. One end of the screw rod is connected with the ball head, the other end of the screw rod is provided with the ratchet, the center of the ratchet is connected with the handle through a pin shaft, the handle is provided with the locking claw at a position close to the ratchet, the head of the locking claw is matched with the ratchet, the handle is provided with the unlocking button at a position corresponding to the tail of the locking claw, the locking claw is separated from the ratchet when the unlocking button is pressed, the handle can rotate around the pin shaft to adjust the angle, the locking claw is re-engaged with the ratchet when the unlocking button is released, and the handle is locked at this position. The specific rotating angle of the handle can be selected according to the space on site, even in the area with limited horizontal space, the handle can be used to drive the screw rod to rotate without the aid of other tools, the operation is convenient, time and labor are saved, and the application scene and range of the F clamp are expanded.

Description

Technical Field

[0001] This invention relates to the field of manual hardware tools, and more particularly to a method for rotating and locking force application of an F-clamp. Background Technology

[0002] Currently, traditional F-clamps, such as the patent application CN219805983U entitled "An Insert-Type F-clamp with a Rotating Mechanism," disclose the basic structural form of existing F-clamps. In use, they all involve rotating a crossarm to drive a lead screw, causing the lead screw to shift vertically and thus applying clamping force. Currently, all crossarms are horizontally inserted into the end of the lead screw, and their position can only be adjusted horizontally to adjust the length of the force-applying lever arm, thereby adjusting the clamping force. This structure works normally in areas with unrestricted space. However, in actual use, areas with limited space often arise where the horizontal direction cannot provide sufficient rotation space for the crossarm, preventing it from being adjusted to the maximum force-applying lever arm length. This results in insufficient clamping force, requiring operators to use other tools to assist in rotating the crossarm to achieve the required clamping force. This operation is difficult, time-consuming, and labor-intensive, and there is currently no good solution to these problems.

[0003] In summary, the aforementioned problems encountered by existing F-clamps in space-constrained areas have become a pressing technical challenge that needs to be addressed within the industry. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides a rotational locking force application method for an F-clamp, which solves the problem that the crossarm of the previous F-clamp could not be adjusted to the maximum force application arm length when used in space-constrained areas, resulting in insufficient clamping force and the need to use other tools to assist in applying force.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A rotational locking force application method for an F-clamp includes an F-clamp body and a movable jaw. One end of the movable jaw is slidably connected to the F-clamp body, and the other end is threadedly connected to a lead screw. One end of the lead screw is fitted with a pressure foot via a ball head, and the other end of the lead screw is provided with a ratchet. The center of the ratchet is rotatably connected to a handle via a pin. A locking pawl is provided inside the handle near the ratchet, and the head of the locking pawl engages with the ratchet. An unlocking button is provided inside the handle corresponding to the tail of the locking pawl. When the unlocking button is pressed, the locking pawl disengages from the ratchet, and the handle can rotate around the pin for angle adjustment. When the unlocking button is released, the locking pawl re-engages with the ratchet, and the handle is locked in this position.

[0006] The handle has a pawl hole near the ratchet, and the locking pawl is movably installed in the pawl hole. The tail of the locking pawl has a button hole, and the unlocking button is installed in the button hole. The unlocking button cooperates with the tail of the locking pawl to control the head of the locking pawl to engage or disengage from the ratchet.

[0007] The tail of the locking claw is hemispherical.

[0008] The upper surface of the unlock button has a groove in the middle that mates with the tail of the locking claw. The inner side of the upper surface of the unlock button has an inclined push surface that mates with the tail of the locking claw. The lower inner side of the unlock button has a spring groove. A spring is installed in the spring groove. One end of the spring abuts against the bottom of the spring groove, and the other end abuts against the inner wall of the button hole.

[0009] When the unlock button is pressed, the compression spring moves inward. When the groove aligns with the locking pawl, the tail of the locking pawl falls into the groove. At this point, the locking pawl disengages from the ratchet, and the handle can rotate freely around the pin. When the unlock button is released, the spring force causes the unlock button to move outward and reset. The tilting push surface cooperates with the tail of the locking pawl to push the locking pawl forward, causing the locking pawl to re-engage with the ratchet. At this point, the handle is locked in this position and cannot be rotated further.

[0010] An extension tube is movably sleeved on the outside of the handle, and a locking structure that cooperates with the handle is installed on the extension tube.

[0011] The locking structure includes several ball grooves spaced apart on the surface of the handle. The ball grooves are connected by guide grooves. A ball that matches the ball groove is installed inside the side wall of the extension tube. An unlocking sleeve is provided outside the ball and fits over the extension tube. An upper retaining spring and a lower retaining spring are provided between the unlocking sleeve and the extension tube. An annular boss is provided on the inner wall of the unlocking sleeve between the upper retaining spring and the lower retaining spring. A compression spring is provided between the annular boss and the lower retaining spring.

[0012] When the unlocking sleeve is pulled down, the compression spring is compressed, the steel ball loses the pressure of the annular boss, and the steel ball disengages from the steel ball groove on the handle. At this time, the extension tube loses the restraining effect of the steel ball, and the extension tube can drive the steel ball to move along the guide groove to the next steel ball groove, thereby realizing the length adjustment. Then, the unlocking sleeve is released, and the unlocking sleeve returns to its original position under the elastic action of the compression spring. The annular boss compresses the steel ball again, pressing the steel ball into the steel ball groove, thus locking the extension tube and the handle.

[0013] The extended tube has a rubber handle on its outer side.

[0014] The F-clamp body is a square L-bar. The tail of the square L-bar is provided with a threaded hole, and a limiting screw is installed in the threaded hole. The head of the square L-bar is provided with a clamping plane, and the end of the movable jaw is provided with a square through hole that slides with the square L-bar.

[0015] The present invention adopts the above-described solution and has the following beneficial effects: A ratchet is located at the other end of the lead screw. The center of the ratchet is rotatably connected to the handle via a pin. A locking pawl is installed inside the handle near the ratchet, and an unlocking button is also installed inside the handle. The unlocking button controls the engagement or disengagement of the locking pawl with the ratchet. When in use, press the unlocking button, at which point the locking pawl disengages from the ratchet, and the handle can rotate freely around the pin. When the desired position is reached, release the unlocking button, and the locking pawl re-engages with the ratchet. At this point, the handle is locked in this position and cannot continue to rotate, preventing accidental rotation of the handle during force application and causing personal injury to the operator. The specific rotation angle of the handle can be arbitrarily selected according to the available space. Even in areas with limited horizontal space, no other tools are needed to assist in applying force; the handle alone can drive the lead screw to rotate. The operation is convenient, time-saving, and labor-saving, expanding the application scenarios and scope of the F-clamp. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is an enlarged structural diagram of the connection between the lead screw and the handle of the present invention.

[0018] Figure 3 This is an enlarged structural diagram of the unlocking sleeve part of the present invention.

[0019] Figure 4 This is a schematic diagram of the handle of the present invention.

[0020] In the diagram, 1. F-clamp body, 2. Moving jaws, 3. Lead screw, 4. Presser foot, 5. Ratchet, 6. Pin, 7. Handle, 8. Claw hole, 9. Locking claw, 10. Button hole, 11. Unlock button, 12. Groove, 13. Inclined push surface, 14. Compression spring groove, 15. Compression spring, 16. Extension tube, 17. Steel ball groove, 18. Guide groove, 19. Steel ball, 20. Unlock sleeve, 21. Upper circlip, 22. Lower circlip, 23. Annular boss, 24. Compression spring, 25. Rubber handle, 26. Limit screw. Detailed Implementation

[0021] 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.

[0022] like Figure 1-4As shown, a rotational locking force application method for an F-clamp includes an F-clamp body 1 and a movable jaw 2. One end of the movable jaw 2 is slidably connected to the F-clamp body 1, and the other end is threadedly connected to a lead screw 3. One end of the lead screw 3 is fitted with a pressure foot 4 via a ball head, and the other end of the lead screw 3 is provided with a ratchet 5. The center of the ratchet 5 is rotatably connected to a handle 7 via a pin 6. A locking pawl 9 is provided inside the handle 7 near the ratchet 5. The head of the locking pawl 9 engages with the ratchet 5. An unlocking button 11 is provided inside the handle 7 corresponding to the tail of the locking pawl 9. When the unlocking button 11 is pressed, the locking pawl 9 disengages from the ratchet 5, and the handle 7 can rotate around the pin 6 for angle adjustment. When the unlocking button 11 is released, the locking pawl 9 re-engages with the ratchet 5, and the handle 7 is locked in this position.

[0023] The handle 7 has a pawl hole 8 near the ratchet 5 inside. The locking pawl 9 is movably installed in the pawl hole 8. The tail of the locking pawl 9 has a button hole 10. The unlocking button 11 is installed in the button hole 10. The unlocking button 11 cooperates with the tail of the locking pawl 9 to control the head of the locking pawl 9 to engage or disengage from the ratchet 5.

[0024] The tail of the locking claw 9 is hemispherical, which facilitates seamless engagement with the unlocking button 11 without jamming.

[0025] The upper surface of the unlock button 11 has a groove 12 in the middle that mates with the tail of the locking claw 9. The inner side of the upper surface of the unlock button 11 has an inclined push surface 13 that mates with the tail of the locking claw 9. The lower inner side of the unlock button 11 has a spring groove 14. A spring 15 is installed in the spring groove 14. One end of the spring 15 abuts against the bottom of the spring groove 14, and the other end abuts against the inner wall of the button hole 10.

[0026] When the unlock button 11 is pressed, the compression spring 15 of the unlock button 11 moves inward. When the groove 12 is aligned with the locking pawl 9, the tail of the locking pawl 9 falls into the groove 12. At this time, the locking pawl 9 disengages from the ratchet 5, and the handle 7 can rotate freely around the pin 6. When the unlock button 11 is released, under the elastic force of the compression spring 15, the unlock button 11 moves outward to reset. The inclined push surface 13 can cooperate with the tail of the locking pawl 9, so that the locking pawl 9 and the ratchet 5 re-engage. At this time, the handle 7 is locked in this position and cannot continue to rotate.

[0027] An extension tube 16 is movably sleeved on the outside of the handle 7. The extension tube 16 is adjustable in length to achieve a labor-saving function. A locking structure that cooperates with the handle 7 is installed on the extension tube 16 to lock the extension tube 16 and the handle 7.

[0028] The locking structure includes several ball grooves 17 spaced apart on the surface of the handle 7. The ball grooves 17 are connected by guide grooves 18. A ball 19 that mates with the ball groove 17 is installed inside the side wall of the extension tube 16. An unlocking sleeve 20 is provided outside the ball 19 and is fitted over the extension tube 16. An upper retaining spring 21 and a lower retaining spring 22 are provided between the unlocking sleeve 20 and the extension tube 16. An annular boss 23 is provided on the inner wall of the unlocking sleeve 20 between the upper retaining spring 21 and the lower retaining spring 22. A compression spring 24 is provided between the annular boss 23 and the lower retaining spring 22.

[0029] When the unlocking sleeve 20 is pulled down, the compression spring 24 is compressed, and the steel ball 19 loses the pressure of the annular boss 23. The steel ball 19 can then disengage from the steel ball groove 17 on the handle 7. At this time, the extension tube 16 loses the restraining effect of the steel ball 19, and the extension tube 16 can drive the steel ball 19 to move along the guide groove 18 into the next steel ball groove 17, thereby achieving length adjustment. Then, the unlocking sleeve 20 is released, and the unlocking sleeve 20 returns to its original position under the elastic action of the compression spring 24. The annular boss 23 then re-presses the steel ball 19, pressing the steel ball 19 into the steel ball groove 17, thus achieving locking between the extension tube 16 and the handle 7.

[0030] The extended tube 16 is provided with a rubber handle 25 on the outside for easy hand-held application of force.

[0031] The F-clamp body 1 is a square L-shaped rod. The tail of the square L-shaped rod is provided with a threaded hole, and a limiting screw 26 is installed in the threaded hole to prevent the moving jaw 2 from slipping. The head of the square L-shaped rod is provided with a clamping plane, and the end of the moving jaw 2 is provided with a square through hole that slides with the square L-shaped rod. The moving jaw 2 and the square L-shaped rod can slide freely but cannot rotate relative to each other.

[0032] Working principle: In use, the operator rotates the lead screw 3 by using the handle 7. The pressure foot 4 at the front end of the lead screw 3 engages with the clamping plane of the head of the F-clamp body 1 to clamp and fix the workpiece. The angle between the handle 7 and the lead screw 3 can be adjusted arbitrarily. The specific rotation angle of the handle 7 can be selected according to the available space. Even in areas with limited horizontal space, no other tools are needed to assist in applying force, making operation convenient, time-saving, and labor-saving. When adjusting the angle, press the unlock button 11. The unlock button 11 compresses the spring 15 and moves inward. When the groove 12 is aligned with the locking pawl 9, the tail of the locking pawl 9 falls into the groove 12. At this time, the locking pawl 9 disengages from the ratchet 5, and the handle 7 can rotate freely around the pin 6. Then release the unlock button 11. Under the elastic force of the spring 15, the unlock button 11 moves outward to reset. The tilting push surface 13 can cooperate with the tail of the locking pawl 9, so that the locking pawl 9 and the ratchet 5 re-engage. At this time, the handle 7 is locked in this position and cannot continue to rotate, preventing the handle 7 from accidentally rotating and causing personal injury to the operator when force is applied. In addition, an extension tube 16 is provided on the outside of the handle 7. The length between the extension tube 16 and the handle 7 can be adjusted to achieve a labor-saving function. When adjusting, pull down the unlocking sleeve 20, the compression spring 24 is compressed, the steel ball 19 loses the squeezing of the annular boss 23, and the steel ball 19 can disengage from the steel ball groove 17 on the handle 7. At this time, the extension tube 16 loses the restraining effect of the steel ball 19, and the extension tube 16 can drive the steel ball 19 to move along the guide groove 18 to the next steel ball groove 17, thereby realizing the length adjustment. Then, release the unlocking sleeve 20, the unlocking sleeve 20 returns to its original position under the elastic action of the compression spring 24, the annular boss 23 squeezes the steel ball 19 again, pressing the steel ball 19 into the steel ball groove 17, realizing the locking between the extension tube 16 and the handle 7.

[0033] 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.

[0034] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A method for rotary locking and applying force to an F-clamp, the F-clamp comprising an F-clamp body and a movable jaw, one end of the movable jaw being slidably connected to the F-clamp body and the other end being threadedly connected to a lead screw, one end of the lead screw being fitted with a pressure foot via a ball head, characterized in that: The other end of the lead screw is provided with a ratchet. The center of the ratchet is rotatably connected to the handle through a pin. A locking pawl is provided inside the handle near the ratchet. The head of the locking pawl engages with the ratchet. An unlocking button is provided inside the handle corresponding to the tail of the locking pawl. When the unlocking button is pressed, the locking pawl disengages from the ratchet, and the handle can rotate around the pin to adjust the angle. When the unlocking button is released, the locking pawl re-engages with the ratchet, and the handle is locked in this position.

2. The rotational locking force application method for the F-clamp according to claim 1, characterized in that: The handle has a pawl hole near the ratchet, and the locking pawl is movably installed in the pawl hole. The tail of the locking pawl has a button hole, and the unlocking button is installed in the button hole. The unlocking button cooperates with the tail of the locking pawl to control the head of the locking pawl to engage or disengage from the ratchet.

3. The rotation locking force application method for the F-clamp according to claim 2, characterized in that: The tail of the locking claw is hemispherical.

4. The rotation locking force application method for the F-clamp according to claim 3, characterized in that: The upper surface of the unlock button has a groove in the middle that mates with the tail of the locking claw. The inner side of the upper surface of the unlock button has an inclined push surface that mates with the tail of the locking claw. The lower inner side of the unlock button has a spring groove. A spring is installed in the spring groove. One end of the spring abuts against the bottom of the spring groove, and the other end abuts against the inner wall of the button hole.

5. The rotational locking force application method for the F-clamp according to claim 4, characterized in that: When the unlock button is pressed, the compression spring moves inward. When the groove aligns with the locking pawl, the tail of the locking pawl falls into the groove. At this point, the locking pawl disengages from the ratchet, and the handle can rotate freely around the pin. When the unlock button is released, the spring force causes the unlock button to move outward and reset. The tilting push surface cooperates with the tail of the locking pawl to push the locking pawl forward, causing the locking pawl to re-engage with the ratchet. At this point, the handle is locked in this position and cannot be rotated further.

6. The rotational locking force application method for an F-clamp according to claim 1, characterized in that: An extension tube is movably sleeved on the outside of the handle, and a locking structure that cooperates with the handle is installed on the extension tube.

7. The rotational locking force application method for an F-clamp according to claim 6, characterized in that: The locking structure includes several ball grooves spaced apart on the surface of the handle. The ball grooves are connected by guide grooves. A ball that matches the ball groove is installed inside the side wall of the extension tube. An unlocking sleeve is provided outside the ball and fits over the extension tube. An upper retaining spring and a lower retaining spring are provided between the unlocking sleeve and the extension tube. An annular boss is provided on the inner wall of the unlocking sleeve between the upper retaining spring and the lower retaining spring. A compression spring is provided between the annular boss and the lower retaining spring.

8. The rotational locking force application method for an F-clamp according to claim 7, characterized in that: When the unlocking sleeve is pulled down, the compression spring is compressed, the steel ball loses the pressure of the annular boss, and the steel ball disengages from the steel ball groove on the handle. At this time, the extension tube loses the restraining effect of the steel ball, and the extension tube can drive the steel ball to move along the guide groove to the next steel ball groove, thereby realizing the length adjustment. Then, the unlocking sleeve is released, and the unlocking sleeve returns to its original position under the elastic action of the compression spring. The annular boss compresses the steel ball again, pressing the steel ball into the steel ball groove, thus locking the extension tube and the handle.

9. The rotational locking force application method for an F-clamp according to claim 6, characterized in that: The extended tube has a rubber handle on its outer side.

10. The rotational locking force application method for an F-clamp according to claim 1, characterized in that: The F-clamp body is a square L-bar. The tail of the square L-bar is provided with a threaded hole, and a limiting screw is installed in the threaded hole. The head of the square L-bar is provided with a clamping plane, and the end of the movable jaw is provided with a square through hole that slides with the square L-bar.

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