Lightweight, low force pliers

Abstract

The utility model relates to tool pliers technical field, especially for a kind of light and easy type tool pliers, including jaw, pressure rod and first jaw lever are equipped in the bottom of jaw, second jaw lever is hinged in the rear side of jaw, pressure rod includes lever portion and second extension, second extension extends to upside in the rear end of lever portion, this kind of structural design makes through the bending of pressure rod to the rear side upper side of jaw to improve the length of power arm of pressure rod, improve the amplification factor of pressure rod to force, and make full use of the space of rear side of jaw, so that in improving the amplification factor of force, tool pliers still can be made into relatively light and easy size;Since second jaw lever includes holding lever portion and first extension, first extension extends to front side in the top end of holding lever portion, this kind of structural design makes the fulcrum of second jaw lever be located in front side, and the fulcrum of second jaw lever needs to be supported by jaw, the size of jaw does not need to extend to the rear side of holding lever portion, so that the jaw can be made more small and light.

Description

Technical Field

[0001] This utility model relates to the field of tool and pliers technology, specifically to a lightweight and labor-saving tool and pliers. Background Technology

[0002] Common types of pliers include hole punchers, eyelet pliers, wire strippers, and crimping pliers. One of the most important performance indicators of pliers is their portability and ease of use. Taking hole punchers as an example, hole punchers are used to punch holes in sheet materials such as leather, paper, thin metal, and plastic. The design of hole punchers mainly needs to consider two factors: first, to save as much effort as possible, and second, to be as convenient to use as possible.

[0003] The applicant previously designed a hole punch (see Chinese patent document CN221892117U), which includes a fixed handle, a rotating handle, a clamp base, a punch, and a pressure bar. The pressure bar is a straight rod, with its middle part hinged to the clamp base. The front end of the pressure bar is located below the punch, and the rear end of the pressure bar is located below the pressing part of the rotating handle. This lever method achieves a relatively labor-saving hole punch structure.

[0004] During actual production and subsequent use, the following problems were found with this hole punch pliers: (1) The rotating handle of this hole punch is equivalent to a first-level lever, and the pressure bar is equivalent to a second-level lever. Since the pressure bar is a straight bar, if the amplification factor of the pressure bar is to be increased, the pressure bar needs to be made longer, which will cause the hinge point between the rotating handle and the pliers to move backward, resulting in a larger pliers size and a larger distance between the rotating handle and the fixed handle, making it inconvenient to hold, and the whole hole punch will be quite bulky.

[0005] (2) The rotating handle of this hole punch applies force to the pressure bar through the pressing part set on the rear side. The reason for setting the pressing part on the rear side of the rotating handle is to increase the length of the power arm of the pressure bar. However, this will increase the size of the pliers seat to accommodate the rear part of the pressure bar and the pressing part on the rear side of the rotating handle. It will also make the whole hole punch relatively bulky and unable to be made into a lighter structure.

[0006] Therefore, current hole punchers struggle to achieve a good balance between size and grip strength amplification. Increasing grip strength amplification leads to larger hole punchers, resulting in an uncoordinated and bulky structure. Conversely, making appropriately sized and lighter hole punchers results in reduced grip strength amplification. Utility Model Content

[0007] The present invention aims to provide a lightweight and labor-saving pliers, which has a high amplification factor for grip strength and a smaller and easier-to-use size.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: Design a lightweight and labor-saving pliers, including a pliers head with a jaw. The pliers head has an upper pusher on the lower side of the jaw and a pressure bar at the bottom of the pliers head. The upper pusher is drivenly connected to the pressure bar. The bottom of the pliers head has a first pliers bar, and a second pliers bar is hinged to the rear side of the pliers head. The second pliers bar includes a gripping part and a first extension part. The first extension part extends forward from the top of the gripping part and is connected to the pliers head via a first hinge structure. The pressure bar includes a lever part and a second extension part. The second extension part extends upward from the rear end of the lever part and is connected to the second pliers bar via a first connecting structure. The front part of the lever part is connected to the bottom of the pliers head via a second hinge structure. At least one of the first hinge structure, the first connecting structure, and the second hinge structure is a sliding connection structure.

[0009] Furthermore, the first hinge structure, the first connecting structure, and the second hinge structure each have a first hinge shaft, a first connecting shaft, and a second hinge shaft, respectively. A first resistance arm is formed on the second clamp rod between the axis of the first hinge shaft and the axis of the first connecting shaft, and a second power arm is formed on the pressure rod between the axis of the first connecting shaft and the axis of the second hinge shaft.

[0010] Furthermore, the first hinge structure is a sliding connection structure, which includes a sliding hole provided on the pliers head, the sliding hole being inclined downward from front to back, the front end of the first extension of the second pliers bar being provided with a first hinge hole, and the first hinge shaft of the first hinge structure passing through the sliding hole and the first hinge hole.

[0011] Furthermore, a first power arm is formed between the end of the gripping rod of the second clamp and the axis of the first hinge shaft, with a length of 150–350 mm; the length of the first resistance arm is 10–60 mm; the length of the second power arm is 30–110 mm; a second resistance arm is formed on the pressure rod between the axis of the second hinge shaft and the contact point between the upper pusher and the front end of the pressure rod, with a length of 5–40 mm.

[0012] Furthermore, a U-shaped buckle is provided at the bottom of the upper pusher, the U-shaped buckle is hinged to the front end of the pressure rod, and a roller is provided at the front end of the pressure rod, with the bottom of the upper pusher abutting against the roller; a return spring is sleeved on the upper pusher, or a return spring is provided between the first clamp and the second clamp.

[0013] Furthermore, a first toothed segment is provided at the lower part of the upper top member, a second toothed segment is provided on the side of the pliers head or the first pliers bar, and a gear is provided between the first toothed segment and the second toothed segment, the gear being hinged to the front end of the pressure rod.

[0014] Furthermore, a screw for adjusting the distance between the first clamp bar and the second clamp bar is provided on the lever portion of the pressure bar. The screw is screwed into the middle part of the lever portion, and the front end of the screw abuts against the clamp head.

[0015] Furthermore, this lightweight and labor-saving pliers is a hole punch, wherein the upper ejector is a circular ejector pin, a pin seat is correspondingly provided on the top inner side of the jaws, and a hole spacing limiter is provided in the jaws; or, This lightweight and labor-saving pliers is a flat hole pliers, wherein the upper ejector is an oval-shaped ejector pin, a pin seat is correspondingly provided on the top inner side of the jaws, and a hole spacing limiter is provided in the jaws; or... This lightweight and labor-saving pliers is a drain hole pliers, wherein the upper ejector is a drain hole lower mold head, and a drain hole upper mold head is correspondingly provided on the top inner side of the pliers jaws; a hole spacing limiter is provided in the pliers jaws; or... This lightweight and labor-saving pliers is a crimping pliers, wherein the upper pusher is a crimping movable block, the top surface of which has multiple crimping protrusions, and the inner top surface of the pliers jaws has corresponding multiple crimping grooves; or... This lightweight and labor-saving tool is a buttonhole pliers, wherein the upper part is a lower buttonhole mold head, and a corresponding upper buttonhole mold head is provided on the top of the inner side of the pliers jaws.

[0016] Furthermore, the first clamp bar is a grooved bar with a first groove on its inner side, and the bottom of the clamp head is provided with a connecting rod portion, which is fixedly connected to the top of the first groove; the rear side of the lever portion and the second extension portion of the pressure bar are grooved bars with a third groove, the front part of the lever portion is composed of a second plate body on the left and / or right side, and the connecting rod portion is arranged intersecting with the second plate body; the gripping rod portion of the second clamp bar is a grooved bar with a second groove on its inner side, and the second extension portion of the pressure bar is located in the second groove; the bending shape of the lever portion and the second extension portion of the pressure bar is consistent with the bending shape of the bottom and back surfaces of the clamp head; the first extension portion of the second clamp bar includes a first plate body located on the left and / or right side of the top of the gripping rod; Alternatively, the first and second clamp bars are solid bars, the clamp head and the first clamp bar are an integral structure, and weight reduction grooves are provided on the clamp head, the first clamp bar and the second clamp bar respectively.

[0017] Furthermore, the maximum opening distance between the rear ends of the first and second clamp bars is 60-145mm; the length from the top of the clamp head to the bottom of the first clamp bar is 150-350mm.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The pressure bar of this lightweight and labor-saving pliers is equivalent to a two-stage lever. The pressure bar includes a lever part and a second extension part. The second extension part extends upward at the rear end of the lever part. This structural design allows the length of the power arm of the pressure bar to be increased by bending the pressure bar upward at the rear side of the pliers head, thereby increasing the force amplification factor of the pressure bar and making full use of the space at the rear side of the pliers head. This allows the pliers to be made into a relatively lightweight size while increasing the force amplification factor. (2) The second pliers bar of this lightweight and labor-saving pliers is equivalent to a first-stage lever. Since the second pliers bar includes a gripping bar part and a first extension part, the first extension part extends forward at the top end of the gripping bar part. This structural design allows the fulcrum of the second pliers bar to be located at the front side. The fulcrum of the second pliers bar needs to be supported by the pliers head. The size of the pliers head does not need to extend to the rear side of the gripping bar part, thereby making the pliers head smaller and lighter. Attached Figure Description

[0019] The present invention will be explained in detail below with reference to the accompanying drawings. It should be noted that the drawings are used to provide a further understanding of the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but should not impose any limitation on the implementability of the present invention.

[0020] In the attached diagram: Figure 1 This is a front view of an embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0021] Figure 2 This is an exploded view of an embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0022] Figure 3 This is a mechanical analysis diagram of an embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of different shaped pressure bars in one embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0024] Figure 5 This is a front view of another embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0025] Figure 6 for Figure 5 A schematic diagram of the structure of the intermediate gear and the first and second tooth segments.

[0026] Figure 7This is a front view of another embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0027] Figure 8 This is a schematic diagram of the structure of different shaped pressure bars in one embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0028] Figure 9 This is a front view of the second clamp bar in another embodiment of the lightweight and labor-saving tool pliers of this utility model.

[0029] Figure 10 This is a front view of another embodiment of the lightweight and labor-saving tool pliers of this utility model, which is a crimping pliers.

[0030] Figure 11 This is a front view of another embodiment of the lightweight and labor-saving tool pliers of this utility model, which is a buttonhole pliers.

[0031] Figure 12 This is a front view of another embodiment of the lightweight and labor-saving tool pliers of this utility model, which is a drain hole pliers.

[0032] In the picture: 10. Pliers head, 11. Pliers jaw, 12. First hinge structure, 121. First hinge shaft, 13. Sliding hole, 14. Second hinge structure, 141. Second hinge shaft, 15. Connecting rod, 16. Hole spacing limiter, 17. Screw, 18. Second tooth segment, 19. Crossbar. 20. Top ejector, 21. U-shaped buckle, 22. Roller, 23. Return spring, 24. Pin seat, 25. First tooth section, 26. Gear, 27. Movable block ejector rod, 28. Lower mold head ejector rod of the buttonhole, 29. Lower mold head ejector rod of the drainage hole; Pressure bar 30, lever part 31, second plate 311, second extension part 32, third groove 33, first front rod part 34; First clamp 40, first groove 41; Second clamp bar 50, gripping bar 51, upper bar 511, lower bar 512, second groove 513, first extension 52, first hinge hole 521, first plate 522, first connecting structure 53, first connecting shaft 531, second front bar 54; Buttonhole mold head 60; The mold head on the drain hole is 70mm. Detailed Implementation

[0033] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0034] In one embodiment, a lightweight and labor-saving pliers tool is provided. In this embodiment, the lightweight and labor-saving pliers tool is a hole punch, such as... Figure 1-2 As shown, this lightweight and labor-saving pliers includes a plier head 10, which is used for drilling operations and for mounting other components of the pliers. The plier head 10 has a jaw 11, in which the part of the thin sheet material to be drilled is placed. The jaw 11 has a slit structure and is wider on the left and right sides so that the depth of the thin sheet material placed in the jaw can be adjusted as needed. The lower side of the jaw 11 has an upper pusher 20, which is a circular pusher pin. The upper pusher 20 drills the thin sheet material by pushing upward. At the bottom of the plier head 10, there is a pressure bar 30. The lower end of the upper pusher 20 is located above the front end of the pressure bar 30. The pressure bar 30 is used to apply upward pushing force to the upper pusher 20 by lever.

[0035] The bottom of the pliers head 10 is provided with a first pliers bar 40, and a second pliers bar 50 is hinged to the rear side of the pliers head 10. By holding the first pliers bar 40 and the second pliers bar 50 and squeezing them together, the upper top member 20 can be driven to move upward. The second pliers bar 50 includes a gripping rod portion 51 and a first extension portion 52. The first extension portion 52 is a relatively short rod-shaped part. The first extension portion 52 extends forward from the top of the gripping rod portion 51. The front end of the first extension portion 52 is connected to the pliers head 10 through a first hinge structure 12. Through the connection method of the first hinge structure 12, the first extension portion 52 can rotate relative to the pliers head 10.

[0036] The pressure rod 30 includes a lever portion 31 and a second extension portion 32, which is also rod-shaped. The second extension portion 32 extends upward from the rear end of the lever portion 31. The upper end of the second extension portion 32 is connected to the second clamp rod 50 via a first connecting structure 53. The first connecting structure 53 is located at the rear end of the second extension portion 32. The first connecting structure 53 enables the second clamp rod 50 to drive the second extension portion 32 to rotate relative to the second clamp rod 50. The first connecting structure 53 can be a fixed connecting structure or a hinged structure. A fixed connecting structure means that the upper end of the second extension portion 32 is fixedly connected to the second clamp rod 50. A hinged structure means that the upper end of the second extension portion 32 can rotate relative to the second clamp rod 50. In this embodiment, the first connecting structure 53 is a hinged structure.

[0037] The front part of the lever 31 is connected to the bottom of the pliers head 10 via a second hinge structure 14. The connection method of the second hinge structure 14 allows the lever 31 to rotate relative to the bottom of the pliers head 10. It should be noted that at least one of the first hinge structure 12, the first connecting structure 53, and the second hinge structure 14 is a sliding connection structure. Here, a sliding connection structure means that the two parts connected by the sliding connection structure can slide relative to each other within a defined range to avoid the first hinge structure 12, the first connecting structure 53, and the second hinge structure 14 forming a stable triangle with the three vertices that prevents them from moving.

[0038] The working principle of this lightweight and labor-saving pliers is as follows: (Combined with...) Figure 1-2 As shown, the part of the thin sheet material that needs to be punched is placed in the jaws 11. The first clamp bar 40 and the second clamp bar 50 are held and squeezed together. The second clamp bar 50 rotates downward with the first hinge structure 12 as the fulcrum. At the same time, the second clamp bar 50 drives the pressure bar 30 to rotate downward with the second hinge structure 14 as the fulcrum. The front end of the pressure bar 30 applies an upward pressure to the upper pusher 20, causing the upper pusher 20 to move upward and punch a hole in the thin sheet material in the jaws 11.

[0039] The lightweight and labor-saving pliers have the following advantages: (1) The lever 30 of the lightweight and labor-saving pliers is equivalent to a two-stage lever. The lever 30 includes a lever part 31 and a second extension part 32. The second extension part 32 extends upward at the rear end of the lever part 31. This structural design allows the length of the power arm of the lever 30 to be increased by bending the lever 30 upward at the rear side of the pliers head 10, thereby increasing the force amplification factor of the lever and making full use of the space at the rear side of the pliers head 10. This allows the pliers to be made into a relatively lightweight size while increasing the force amplification factor. (2) The second pliers 50 of the lightweight and labor-saving tool is equivalent to a first-level lever. Since the second pliers 50 includes a gripping bar 51 and a first extension 52, the first extension 52 extends forward from the top of the gripping bar 51. This structural design makes the fulcrum (first hinge structure 12) of the second pliers 50 located on the front side. The fulcrum of the second pliers 50 needs to be supported by the pliers head 10. The size of the pliers head 10 does not need to extend to the rear side of the gripping bar 51, so that the pliers head 10 can be made smaller and lighter.

[0040] Furthermore, in another embodiment, such as Figure 1-2As shown, the first hinge structure 12, the first connecting structure 53, and the second hinge structure 14 of this lightweight and labor-saving pliers each have a first hinge shaft 121, a first connecting shaft 531, and a second hinge shaft 141, respectively. In addition, the first hinge structure 12 also includes hinge holes provided at corresponding positions on the front end of the first extension 52 and the pliers head 10; the first connecting structure 53 also includes connecting holes provided at corresponding positions on the rear end of the first extension 52 and the upper end of the second extension 32, and the first connecting structure 53 is a hinge structure; the second hinge structure 14 also includes hinge holes provided at corresponding positions on the front side of the lever portion 31 and the lower part of the pliers head 10.

[0041] Combination Figure 3 As shown, a first resistance arm L1 is formed on the second clamp 50 between the axis of the first hinge shaft 121 and the axis of the first connecting shaft 531. A second power arm L2 is formed on the pressure rod 30 between the axis of the first connecting shaft 531 and the axis of the second hinge shaft 141. The angle between the first resistance arm and the second power arm is between 0° and 30°. Since at least one of the first hinge structure 12, the first connecting structure 53, and the second hinge structure 14 is a sliding connection structure, the angle between the first resistance arm L1 and the second power arm L2 will change slightly during the clamping of the first clamp 40 and the second clamp 50, but the change is controlled within a small range. The angle between the first resistance arm L1 and the second power arm L2 is between 0° and 5°. This small angle allows the force exerted by the first resistance arm L1 on the second power arm L2 to become the power of the secondary lever formed by the pressure rod 30 to the maximum extent.

[0042] Furthermore, in another embodiment, such as Figure 1-2 As shown, the first hinge structure 12 of this lightweight and labor-saving pliers is a sliding connection structure, while the first connection structure 53 and the second hinge structure 14 are both ordinary non-sliding hinge structures connected by a shaft. The first hinge structure 12 includes a sliding hole 13 on the pliers head 10, which slopes downwards from front to back. Figure 2 The first extension 52 of the second clamp bar 50 is provided with a first hinge hole 521 at its front end. The first hinge shaft 121 of the first hinge structure 12 passes through the sliding hole 13 and the first hinge hole 521. This structure of the first hinge structure 12 allows the first extension 52 to rotate relative to the clamp head 10. At the same time, the first hinge shaft 121 can also slide along the sliding hole 13, preventing the three vertices of a stable triangle from forming between the first hinge structure 12, the first connecting structure 53 and the second hinge structure 14, thus preventing them from moving.

[0043] Furthermore, in another embodiment, such as Figure 3As shown, the first power arm L3 is located between the end of the gripping rod 51 of the second lever 50 of the lightweight and labor-saving pliers and the axis of the first hinge shaft. The length of the first power arm L3 ranges from 150 to 350 mm. In this embodiment, the length of the first power arm L3 is designed to be 252.64 mm. The length of the first resistance arm L1 ranges from 10 to 60 mm. In this embodiment, the length of the first resistance arm L1 is designed to be 24 mm. The length of the second power arm L2 ranges from 30 to 110 mm. In this embodiment, the length of the second power arm L2 is designed to be 55 mm. A second resistance arm L4 is formed on the pressure bar 30 between the axis of the second hinge shaft 141 and the contact point between the upper push member 20 and the front end of the pressure bar 30. The length of the second resistance arm L4 ranges from 5 to 40 mm. In this embodiment, the length of the second resistance arm L4 is designed to be 12.5 mm.

[0044] The theoretical amplification factor of this lightweight, labor-saving pliers for grip force is as follows: The second lever 50 is equivalent to a primary lever, and the pressure lever 30 is equivalent to a secondary lever. The amplification factor of the primary lever on grip force is: 252 ÷ 24 = 10.5 times; the amplification factor of the secondary lever on the primary lever is: 55 ÷ 12.5 = 4.2 times; the total amplification factor = primary lever amplification factor × secondary lever amplification factor = 10.5 × 4.4 = 46.2 times. Therefore, theoretically, this lightweight, labor-saving pliers amplifies grip force by 46.2 times, which is very high. Even considering some wear and tear, the amplification factor can still reach over 40 times, demonstrating excellent labor-saving effect.

[0045] Furthermore, in another embodiment, such as Figure 1 As shown, the maximum opening distance between the rear ends of the first jaw 40 and the second jaw 50 of this lightweight and labor-saving pliers is 60-145mm. In this embodiment, the maximum opening distance L5 is 120mm. In this embodiment, the stroke of the upper support 20 is 5.7mm. The length from the top of the jaw 10 to the bottom of the first jaw 40 ranges from 150-350mm. In this embodiment, the length from the top of the jaw 10 to the bottom of the first jaw 40 is 275mm, meaning the total length of this lightweight and labor-saving pliers is 275mm. Based on the above dimensional data of this lightweight and labor-saving pliers, it can be seen that it achieves a relatively large magnification while maintaining a compact size and structure.

[0046] Furthermore, in another embodiment, such as Figure 1-2As shown, the first clamp bar 40 of this lightweight and labor-saving pliers is a grooved bar with a first groove 41 on its inner side. The bottom of the clamp head 10 has a connecting rod portion 15, which is fixedly connected to the top of the first groove 41. This type of first clamp bar 40 is a sheet metal part with good machining precision. The connecting rod portion 15 is fixedly connected to the top of the first groove 41 by two rivets. The rear side of the lever portion 31 and the second extension portion 32 of the pressure rod 30 are grooved bars with a third groove 33 on their inner side. The front side of the lever portion 31 is formed by the left and right second plates 311. The connecting rod portion 15 on the lower side of the clamp head 10 passes between the left and right second plates 311, resulting in a suitable and compact connection structure between the connecting rod portion 15 and the pressure rod 30. In other embodiments, combined with... Figure 4 As shown, the front side of the lever can also be formed by one of the second plates 311 on the left or right.

[0047] In this lightweight and labor-saving pliers, the gripping rod 51 of the second pliers 50 is a groove-shaped rod with a second groove 513 on the inner side. The rear side of the second extension 32 of the pressure rod 30 is located at the top of the second groove 513. Similarly, the second pliers 50 of this structure is also a sheet metal part with good machining accuracy. By accommodating the rear side of the second extension 32 at the top of the second groove, the whole structure is made more compact and small.

[0048] like Figure 1-2 As shown, the bending shapes of the lever portion 31 and the second extension portion 32 of the pressure bar 30 are consistent with the bending shapes of the bottom and back surfaces of the pliers head 10. The first extension portion 52 of the second pliers bar 50 includes first plates 522 respectively disposed on the left and right sides of the top end of the gripping bar 51. The first plates 522 on the left and right sides clamp the pliers head 10, ensuring that the first extension portion 52 has high strength. In other embodiments, the first extension portion may also be a first plate disposed only on the left or right side of the top end of the gripping bar 51.

[0049] Furthermore, in another embodiment, such as Figure 1-2As shown, this lightweight and labor-saving pliers has a U-shaped buckle 21 at the bottom of the upper push member 20. The U-shaped buckle 21 is inverted, and the top surface of the U-shaped buckle 21 has a hole in the middle for the upper push member 20 to pass through upward. The bottom of the upper push member 20 has a limiting pin cap, and a roller 22 is provided at the front end of the pressure rod 30. The roller 22 is set inside the U-shaped buckle 21, and the roller 22 and the U-shaped buckle 21 are hinged together at the front end of the pressure rod 30. The bottom of the upper push member 20 abuts against the roller 22. When the front end of the pressure rod 30 is lifted, the roller 22 contacts the bottom of the upper push member 20 to ensure that there is always a vertical upward force on the upper push member 20. A hole is provided on the lower side of the jaws 11 of the pliers head 10 for the upper pusher 20 to pass through. A return spring 23 is fitted on the upper pusher 20 between the pliers head 10 and the U-shaped buckle 21. A needle seat 24 corresponding to the upper pusher 20 is provided on the top inner side of the jaws 11. The needle seat 24 has a round hole corresponding to the needle tip of the upper pusher 20. After drilling, the return spring 23 can reset the upper pusher 20, the pressure rod 30, and the second pliers bar 50. In other embodiments, a return spring can also be provided between the first pliers bar and the second pliers bar, with one end of the return spring abutting against the side of the first pliers bar and the other end abutting against the side of the second pliers bar, which can also achieve reset.

[0050] like Figure 1-2 As shown, a hole spacing limiter 16 is provided in the jaw 11. The lower front end of the hole spacing limiter 16 is a baffle that matches the spacing of the jaw 11. The two ear plates on the rear side are provided with elongated holes. The hole spacing limiter 16 is connected to the rear side of the jaw 10 by setting bolts in the elongated holes. After the hole spacing limiter 16 is moved back and forth to adjust to a suitable position, it can be positioned by bolts.

[0051] In addition, such as Figure 1-2 As shown, a screw 17 for adjusting the distance between the first clamp bar 40 and the second clamp bar 50 is provided on the lever portion 31 of the pressure bar 30. A screw hole is provided in the middle of the lever portion 31, and the screw 17 is screwed into the screw hole in the middle of the lever portion 31. The front end of the screw 17 abuts against the lower rear end of the pliers head 10. By turning the screw 17, the distance between the first clamp bar 40 and the second clamp bar 50 can be finely adjusted. The use of the screw 17 for adjustment has two advantages: first, it allows the distance between the first clamp bar 40 and the second clamp bar 50 to be adjusted to a suitable size according to the user's hand size; second, since there may be a certain amount of play in the assembly of the various parts of this lightweight and labor-saving pliers, the stroke of the upper lifting member 20 may have a certain amount of play. By finely adjusting the distance between the first clamp bar 40 and the second clamp bar 50, the stroke of the upper lifting member 20 can be made to be the true stroke, and the stroke fits the feel.

[0052] Furthermore, such as Figure 5 and Figure 6As shown, a first toothed segment 25 is provided at the lower part of the upper pusher 20, and a second toothed segment 18 is provided on the front side of the jaw head 10 (or the second toothed segment can be provided on the front side of the first jaw bar). A gear 26 is provided between the first toothed segment 25 and the second toothed segment 18. The gear 26 is hinged to the front end of the pressure rod 30. By engaging the first jaw bar 40 and the second jaw bar 50, the front end of the pressure rod 30 can drive the gear 26 to move upward. During the movement, the front side of the gear 26 meshes with the first toothed segment 25, and the rear side meshes with the second toothed segment 18, thereby pushing the upper pusher 20 to move upward. That is, the upper pusher 20 and the pressure rod 30 are driven and connected by the engagement of the gear and the toothed segment. A crossbar portion 19 is provided at the bottom front side of the jaw head 10, and a guide hole corresponding to the upper pusher 20 is provided on the crossbar portion 19 to guide the up and down movement of the upper pusher 20.

[0053] Furthermore, in another embodiment, such as Figure 7-9 As shown, the head 10 and the first bar 40 of this lightweight and labor-saving pliers are an integral structure. Weight-reducing grooves are provided on both sides of the head 10, the first bar 40, and the second bar 50. This type of structure, with the head 10, the first bar 40, and the second bar 50 being cast, results in high strength. Specifically, a first front bar portion 34 is provided at the front end of the pressure bar 30, with the bottom end of the head 10 located within the first front bar portion 34. A second front bar portion 54 is provided at the top of the second bar 50, and a second extension portion 32 on the rear side of the pressure bar 30 is located within the second front bar portion 54. The inclusion of the first front bar portion 34 and the second front bar portion 54 facilitates quick assembly of the entire pliers.

[0054] like Figure 8 As shown, in some embodiments, the first front rod portion 34 can be as follows: Figure 8 The fork shape shown in -C can also be as follows: Figure 8 -A and Figure 8 -B shows a single-sided plate shape provided on the left or right side. Similarly, in some embodiments, the second front rod portion 54 can be a fork shape or a single-sided plate shape provided on the left or right side.

[0055] like Figure 9 As shown, the gripping lever 51 of the second clamp lever 50 includes an upper lever 511 and a lower lever 512. The upper lever 511 is perpendicular to the first extension 52, and the lower lever 512 is inclined forward relative to the upper lever 511. This structure ensures that the length of the power arm of the first-stage lever formed by the second clamp lever 50 is approximately equal to the distance between the end of the lower lever 512 and the fulcrum (the central axis of the first hinge structure between the front end of the first extension 52 and the clamp head 10). The length of the power arm maximizes the utilization of the dimensions of the second clamp lever 50. The slight forward inclination of the lower lever 512 relative to the upper lever 511 makes the direction of the grip force most reasonable, maximizing the utilization of the grip force.

[0056] Furthermore, in another embodiment, the lightweight and labor-saving tool pliers have an elliptical pin as the upper ejector, with a corresponding pin seat on the top inner side of the jaws, and a hole spacing limiter also provided in the jaws. The difference between this embodiment and the previous embodiment lies in the shape of the upper ejector; in this embodiment, the upper ejector is elliptical, used for drilling flat holes in thin sheet-like plates, while the tool pliers in the previous embodiments were used for drilling round holes.

[0057] Furthermore, in another embodiment, such as Figure 10 As shown, this lightweight and labor-saving pliers is a crimping pliers, used for crimping wires and terminals when connecting them. In this embodiment, the upper top member 20 is a crimping movable block, which is located on the lower inner side of the jaw 11. The bottom of the crimping movable block has a movable block top rod 27 that passes through the bottom of the jaw 11, and a spring is also fitted on the movable block top rod 27. The top surface of the crimping movable block has multiple crimping protrusions, and the top inner side of the jaw 11 has corresponding multiple crimping grooves. Different sized crimping protrusions and crimping grooves are used to crimp terminals of different sizes. Figure 10 In this example, the jaws of the lightweight and labor-saving pliers are separate from the first jaw bar on its lower side. It is understood that, as described in the previous embodiment, the jaws of the lightweight and labor-saving pliers and the first jaw bar on its lower side can also be a solid, integrated structure.

[0058] Furthermore, such as Figure 11 As shown, in another embodiment, this lightweight and labor-saving pliers is a buttonhole pliers. The upper pusher 20 is a lower buttonhole mold head. A lower buttonhole mold head push rod 28, penetrating the lower part of the jaws 11, is provided at the bottom of the lower buttonhole mold head. A spring is also fitted onto the lower buttonhole mold head push rod 28. A corresponding upper buttonhole mold head 60 is provided at the top inner side of the jaws 11. A buttonhole push rod is provided at the bottom of the upper buttonhole mold head 60. A corresponding buttonhole push rod hole is provided in the lower buttonhole mold head. The buttonhole pliers are used for punching buttonholes on fabrics, etc. Figure 11 In this example, the jaws of the lightweight and labor-saving pliers are separate from the first jaw bar on its lower side. It is understood that, as described in the previous embodiment, the jaws of the lightweight and labor-saving pliers and the first jaw bar on its lower side can also be a solid, integrated structure.

[0059] Furthermore, such as Figure 12As shown, in another embodiment, the lightweight and labor-saving pliers are drainage hole pliers. These pliers are used to create drainage holes on illuminated advertising signs that allow water to drip but not light to pass through. This drainage hole is formed by creating a three-dimensional triangular protrusion on the metal panel of the illuminated sign, with a drainage hole formed on one side of the triangular protrusion. In this embodiment, the upper part 20 is a drainage hole lower mold head. The bottom of the drainage hole lower mold head has a drainage hole lower mold head top rod 29 that passes through the bottom of the pliers jaw 11. A spring is also fitted on the drainage hole lower mold head top rod 29. A drainage hole upper mold head 70 is correspondingly provided on the top inner side of the pliers jaw 11. A hole spacing limiter is also provided in the pliers jaw. The bottom of the drainage hole lower mold head has a three-dimensional triangular top cone, and the drainage hole upper mold head 70 has a corresponding slot. Figure 12 In this example, the jaws of the lightweight and labor-saving pliers are separate from the first jaw bar on its lower side. It is understood that, as described in the previous embodiment, the jaws of the lightweight and labor-saving pliers and the first jaw bar on its lower side can also be a solid, integrated structure.

[0060] It should be noted that the crimping pliers, eyelet pliers, flat hole pliers, and drain hole pliers differ from hole punching pliers in that they use different punching heads. The punching heads of crimping pliers, eyelet pliers, flat hole pliers, and drain hole pliers are pre-existing parts, and their shapes will not be described in detail here. Furthermore, apart from these crimping pliers, eyelet pliers, flat hole pliers, and drain hole pliers, other similar pliers can be used to achieve the same results by replacing the corresponding punching heads.

[0061] It should be noted that, unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains, and terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art. It should also be understood that the above is a description of this disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of this disclosure have been described, those skilled in the art will readily understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this invention. Therefore, all such modifications are intended to be included within the scope of this disclosure as defined in the claims, and will not be detailed here.

Claims

1. A lightweight and labor-saving pliers, comprising a pliers head, a jaw being provided in the pliers head, an upper pusher being provided on the lower side of the jaw, a pressure bar being provided at the bottom of the pliers head, the upper pusher being drivenly connected to the pressure bar, a first pliers bar being provided at the bottom of the pliers head, and a second pliers bar being hinged to the rear side of the pliers head, characterized in that: The second clamp bar includes a gripping rod portion and a first extension portion. The first extension portion extends forward from the top of the gripping rod portion, and the front end of the first extension portion is connected to the clamp head via a first hinge structure. The pressure bar includes a lever portion and a second extension portion. The second extension portion extends upward from the rear end of the lever portion, and the upper end of the second extension portion is connected to the second clamp bar via a first connecting structure. The front portion of the lever portion is connected to the bottom of the clamp head via a second hinge structure. At least one of the first hinge structure, the first connecting structure, and the second hinge structure is a sliding connection structure.

2. The lightweight and labor-saving pliers according to claim 1, characterized in that: The first hinge structure, the first connecting structure, and the second hinge structure each have a first hinge shaft, a first connecting shaft, and a second hinge shaft, respectively. A first resistance arm is formed on the second clamp rod between the axis of the first hinge shaft and the axis of the first connecting shaft, and a second power arm is formed on the pressure rod between the axis of the first connecting shaft and the axis of the second hinge shaft.

3. The lightweight and labor-saving pliers according to claim 2, characterized in that: The first hinge structure is a sliding connection structure, which includes a sliding hole provided on the pliers head. The sliding hole is inclined downward from front to back. The front end of the first extension of the second pliers bar is provided with a first hinge hole. The first hinge shaft of the first hinge structure passes through the sliding hole and the first hinge hole.

4. The lightweight and labor-saving pliers according to claim 2, characterized in that: The first power arm is located between the end of the gripping rod of the second clamp and the axis of the first hinge shaft, and the length of the first power arm is 150-350mm; the length of the first resistance arm is 10-60mm; the length of the second power arm is 30-110mm; a second resistance arm is formed on the pressure rod between the axis of the second hinge shaft and the contact point between the upper push member and the front end of the pressure rod, and the length of the second resistance arm is 5-40mm.

5. The lightweight and labor-saving pliers according to claim 1, characterized in that: A U-shaped buckle is provided at the bottom of the upper pusher, the U-shaped buckle is hinged to the front end of the pressure rod, and a roller is provided at the front end of the pressure rod, with the bottom of the upper pusher abutting against the roller; a return spring is sleeved on the upper pusher, or a return spring is provided between the first clamp and the second clamp.

6. The lightweight and labor-saving pliers according to claim 1, characterized in that: A first toothed segment is provided at the lower part of the upper pusher, and a second toothed segment is provided on the side of the pliers head or the first pliers bar. A gear is provided between the first toothed segment and the second toothed segment, and the gear is hinged to the front end of the pressure bar.

7. The lightweight and labor-saving pliers according to claim 1, characterized in that: A screw for adjusting the distance between the first clamp bar and the second clamp bar is provided on the lever part of the pressure bar. The screw is screwed into the middle part of the lever part, and the front end of the screw abuts against the clamp head.

8. The lightweight and labor-saving pliers according to claim 1, characterized in that: This lightweight and labor-saving pliers is a hole punch, wherein the upper ejector is a circular ejector pin, a pin seat is correspondingly provided on the top inner side of the jaws, and a hole spacing limiter is provided in the jaws; or... This lightweight and labor-saving pliers is a flat hole pliers, wherein the upper ejector is an oval-shaped ejector pin, a pin seat is correspondingly provided on the top inner side of the jaws, and a hole spacing limiter is provided in the jaws; or... This lightweight and labor-saving pliers is a drain hole pliers, wherein the upper ejector is a drain hole lower mold head, and a drain hole upper mold head is correspondingly provided on the top inner side of the pliers jaws; a hole spacing limiter is provided in the pliers jaws; or... This lightweight and labor-saving pliers is a crimping pliers, wherein the upper pusher is a crimping movable block, the top surface of which has multiple crimping protrusions, and the inner top surface of the pliers jaws has corresponding multiple crimping grooves; or... This lightweight and labor-saving tool is a buttonhole pliers, wherein the upper part is a lower buttonhole mold head, and a corresponding upper buttonhole mold head is provided on the top of the inner side of the pliers jaws.

9. The lightweight and labor-saving pliers according to claim 1, characterized in that: The first clamp bar is a grooved bar with a first groove on its inner side, and the bottom of the clamp head is provided with a connecting rod portion, which is fixedly connected to the top of the first groove; the rear side of the lever portion and the second extension portion of the pressure bar are grooved bars with a third groove, the front part of the lever portion is composed of a second plate body on the left and / or right side, and the connecting rod portion is arranged intersecting with the second plate body; the gripping rod portion of the second clamp bar is a grooved bar with a second groove on its inner side, and the second extension portion of the pressure bar is located in the second groove; the bending shape of the lever portion and the second extension portion of the pressure bar is consistent with the bending shape of the bottom and back surfaces of the clamp head; the first extension portion of the second clamp bar includes a first plate body located on the left and / or right side of the top of the gripping rod; Alternatively, the first and second clamp bars are solid bars, the clamp head and the first clamp bar are an integral structure, and weight reduction grooves are provided on the clamp head, the first clamp bar and the second clamp bar respectively.

10. The lightweight and labor-saving pliers according to claim 1, characterized in that: The maximum opening distance between the rear ends of the first and second clamp bars is 60-145mm; the length from the top of the clamp head to the bottom of the first clamp bar is 150-350mm.

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