Precise flat tongs

Abstract

The utility model relates to the technical field of flat tongs, and provides precise flat tongs which comprise a tong body, a fixed jaw and a movable jaw are arranged at the top of the tong body, a movable block is arranged at the bottom of the movable jaw and is in threaded connection with a first lead screw, a clamping block is arranged on the side, close to the fixed jaw, of the movable jaw, and the first lead screw is in threaded connection with the movable block. The clamping block is rotationally connected with the movable block through a rotating shaft, and a locking mechanism used for preventing the clamping block from rotating is arranged on the movable jaw. According to the technical scheme, the clamping effect of the flat tongs on a workpiece is improved, the workpiece is not prone to loosening in the machining process, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flat-nose pliers, and in particular to a precision flat-nose pliers. Background Art

[0002] Flat-nose pliers are a common hand tool used to clamp and secure workpieces for machining operations such as cutting, grinding, or welding. They consist of a fixed jaw and a movable jaw, with a screw-type clamping mechanism that allows the jaws to be adjusted in width. Flat-nose pliers are widely used in machining, woodworking, and metalworking.

[0003] Currently, when clamping parts that require high perpendicularity between the reference side and the machining surface, the reference side of the workpiece is typically placed against one side of the fixed jaws, while the side not requiring perpendicularity is placed against the side of the movable jaws. A round bar is then placed at the bottom of the workpiece to support it. The movable jaws are then moved to clamp the side not requiring perpendicularity. However, this method is only suitable when the difference in parallelism between the reference surface and the opposite surface is small. If the difference in parallelism between the two surfaces is large, the movable jaws will not be able to fully align with the side not requiring perpendicularity, thus reducing the clamping effectiveness of the flat-nose pliers on the workpiece. This can cause the workpiece to loosen during machining, or even be scrapped, resulting in poor safety. Utility Model Content

[0004] The utility model provides a precision flat-nose pliers, which improves the clamping effect of the flat-nose pliers on the workpiece, makes the workpiece less likely to loosen during the processing, and improves safety.

[0005] The technical solution of the utility model is as follows: a precision flat-nose pliers, comprising a pliers body, a fixed jaw and a movable jaw being provided on the top of the pliers body, a movable block being provided at the bottom of the movable jaw, and the movable block being threadedly connected to a first lead screw, a clamping block being provided on the side of the movable jaw close to the fixed jaw, and the clamping block being rotatably connected to the movable block through a rotating shaft, and a locking mechanism being provided on the movable jaw for preventing the clamping block from rotating.

[0006] Furthermore, the clamping block is connected to the movable jaw through a connecting rod assembly, and the connecting rod assembly includes a first connecting rod rotatably connected to the clamping block at one end, a sliding rod rotatably connected to the other end of the first connecting rod, and an elastic member. A locking groove is provided inside the clamping block, one end of the elastic member abuts against the side of the locking groove away from the clamping block, and the other end of the elastic member abuts against the side of the sliding rod away from the first connecting rod.

[0007] Furthermore, one end of the sliding rod is arranged in the locking groove, and the other end of the sliding rod extends to the outside of the movable jaw. The first connecting rod is rotatably connected to the side of the sliding rod away from the movable jaw. The sliding rod is fixedly connected to a sliding block on one side inside the locking groove, and the sliding block is slidably connected to the inner wall of the locking groove. The cross-section of the sliding block is a square structure.

[0008] Furthermore, a mounting groove is provided on one side of the sliding block opposite to the locking groove, and both ends of the elastic member are fixedly connected to the inside of the corresponding mounting groove.

[0009] Furthermore, a receiving groove is provided on the side of the locking groove away from the sliding rod, and the receiving groove is connected to the interior of the locking groove. The locking mechanism includes a locking screw rotatably connected to the inner wall of the receiving groove, a locking plate threadedly connected to the locking screw, and a locking rod arranged on the locking plate. The locking plate is arranged inside the receiving groove, one end of the locking rod extends into the interior of the locking groove, and the position of the locking rod corresponds to the position of the sliding block.

[0010] Furthermore, a guide rod is fixedly connected to the inner wall of the accommodating groove, and the locking plate is slidably connected to the guide rod.

[0011] Furthermore, a countersunk groove is provided on the side of the movable jaw away from the clamping block, and the side of the locking screw away from the elastic member extends into the countersunk groove and is fixedly connected to a rotating block, and the side of the rotating block away from the locking screw is provided with a hexagonal groove.

[0012] Furthermore, a scale line is provided on the top of the clamp body.

[0013] Furthermore, a rubber pad is fixedly connected to one side of the locking rod close to the sliding rod.

[0014] The working principle and beneficial effects of the utility model are as follows:

[0015] When in use, place the reference surface of the workpiece against one side of the fixed jaws, then rotate the first screw to push the movable block, driving the movable jaws and the clamping block to gradually clamp the workpiece. As the movable jaws gradually advance, the clamping block will fit tightly with the corresponding end face of the clamped workpiece. If the parallelism of the two sides of the workpiece differs greatly, the clamping block set on the movable block will automatically fine-tune the angle around the rotating axis, so that the clamping block fits tightly with the end face of the clamped workpiece. This thereby improves the clamping effect of the flat-nose pliers on the workpiece, reduces the risk of the workpiece loosening during processing, and improves safety. Subsequently, the operator can lock the clamping block through the locking mechanism to prevent the clamping block from rotating, further improving safety during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0019] Figure 3 This is a top view of the utility model;

[0020] Figure 4 It is a schematic diagram of the local structure of the utility model;

[0021] Figure 5 for Figure 4 Enlarged schematic diagram of point A in the middle.

[0022] In the figure: 1. Jaw body; 101. Fixed jaws; 102. Movable jaws; 103. Movable block; 104. First lead screw; 105. Clamping block; 106. Rotating shaft; 2. First connecting rod; 201. Sliding rod; 202. Elastic member; 203. Locking groove; 204. Sliding block; 205. Mounting groove; 3. Accommodating groove; 301. Locking lead screw; 302. Locking plate; 303. Locking rod; 304. Guide rod; 305. Countersunk groove; 306. Rotating block; 307. Hexagonal socket; 308. Rubber pad; 4. Scale line. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] refer to Figure 1-5 A precision flat-nose pliers comprises a pliers body 1, a fixed jaw 101 and a movable jaw 102 are provided on the top of the pliers body 1, a movable block 103 is provided at the bottom of the movable jaw 102, and the movable block 103 is threadedly connected to a first screw 104, a clamping block 105 is provided on the side of the movable jaw 102 close to the fixed jaw 101, and the clamping block 105 is rotatably connected to the movable block 103 through a rotating shaft 106, the rotating shaft 106 should be set at the center position of the clamping block 105, and the vertical axis of the rotating shaft 106 and the horizontal axis of the first screw 104 are in the same plane, and a locking mechanism for preventing the clamping block 105 from rotating is provided on the movable jaw 102.

[0025] During specific use, the reference surface of the workpiece is placed against one side of the fixed jaws 101, and then the first screw 104 is rotated to push the movable block 103, driving the movable jaws 102 and the clamping block 105 to gradually clamp the workpiece. As the movable jaws 102 are gradually advanced, the clamping block 105 will fit tightly with the corresponding end face of the clamped workpiece. If the parallelism of the two sides of the workpiece differs greatly, the clamping block 105 set on the movable block 103 will automatically fine-tune the angle around the rotating shaft 106, so that the clamping block 105 fits tightly with the end face of the clamped workpiece. This improves the clamping effect of the flat-nose pliers on the workpiece, reduces the risk of the workpiece loosening during processing, and improves safety. Subsequently, the operator can lock the clamping block 105 through the locking mechanism to prevent the clamping block 105 from rotating, further improving safety during processing.

[0026] Furthermore, the clamping block 105 is connected to the movable jaw 102 through a connecting rod assembly. The connecting rod assembly includes a first connecting rod 2 rotatably connected to the clamping block 105 at one end, a sliding rod 201 rotatably connected to the other end of the first connecting rod 2, and an elastic member 202 (the elastic member 202 can be a cylindrical compression spring). A locking groove 203 is provided inside the clamping block 105, one end of the elastic member 202 abuts against the side of the locking groove 203 away from the clamping block 105, and the other end of the elastic member 202 abuts against the side of the sliding rod 201 away from the first connecting rod 2.

[0027] When the clamping block 105 fine-tunes its angle around the rotation axis 106, the clamping block 105 drives the sliding rod 201 within the locking groove 203 via the first connecting rod 2, causing the sliding rod 201 to compress the elastic member 202. After processing is completed, the operator rotates the first lead screw 104 in the opposite direction, which gradually drives the movable jaw 102 and the clamping block 105 to release the workpiece. Simultaneously, the elastic member 202 gradually recovers its deformation, driving the sliding rod 201 in the opposite direction. The sliding rod 201 drives the clamping block 105 to rotate to its original position via the first connecting rod 2, thereby maintaining the plane of the clamping block 105 parallel to the plane of the fixed jaw 101.

[0028] By providing the elastic member 202, after the workpiece is processed, the operator does not need to manually maintain the plane of the clamping block 105 parallel to the plane of the fixed jaw 101, thereby simplifying the operation process and improving work efficiency. In addition, a scale mark 4 can be provided on the top of the clamp body 1 to facilitate the operator to determine whether the plane of the clamping block 105 remains horizontal.

[0029] In addition, the connecting rod assembly can be arranged into two groups, and the first connecting rods 2 in the two groups of connecting rod assemblies are respectively rotatably connected to the two sides of the clamping block 105, and the first connecting rods 2 in each connecting rod assembly are arranged into two. This can significantly improve the connection strength between the clamping block 105 and the movable jaw 102 (it should be noted that if the connecting rod assembly is arranged into two groups, the corresponding locking mechanism is also arranged into two groups. When the clamping block 105 rotates, the elastic member 202 in one of the connecting rod assemblies will be compressed, and the elastic member 202 in the other connecting rod assembly will be stretched).

[0030] In this embodiment, one end of the sliding rod 201 is disposed within the locking groove 203, and the other end of the sliding rod 201 extends outside the movable jaw 102. The first connecting rod 2 is rotatably connected to the side of the sliding rod 201 away from the movable jaw 102. A sliding block 204 is fixedly connected to one side of the sliding rod 201 within the locking groove 203, and the sliding block 204 is slidably connected to the inner wall of the locking groove 203. The cross-section of the sliding block 204 is square, and the sliding block 204 is generally rectangular. The square cross-section of the sliding block 204 can better fit the inner wall of the locking groove 203. At the same time, it can also prevent the sliding block 204 from shifting or misaligning during movement, ensure that the elastic member 202 is evenly stressed, thereby increasing the service life of the elastic member 202 and enhancing the reliability and stability of the connecting rod assembly under long-term use.

[0031] Secondly, mounting grooves 205 are provided on the side of the sliding block 204 opposite the locking groove 203, and the two ends of the elastic member 202 are fixedly connected to the corresponding interior of the mounting grooves 205. The mounting grooves 205 allow the two ends of the elastic member 202 to be respectively embedded therein and secure the two ends of the elastic member 202, reducing the possibility of the elastic member 202 being deflected by axial force, further improving the reliability and stability of the connecting rod assembly under long-term use.

[0032] In this embodiment, a receiving groove 3 is provided on the side of the locking groove 203 away from the sliding rod 201, and the receiving groove 3 is connected to the interior of the locking groove 203. The locking mechanism includes a locking screw 301 rotatably connected to the inner wall of the receiving groove 3, a locking plate 302 threadedly connected to the locking screw 301, and a locking rod 303 arranged on the locking plate 302. The locking plate 302 is arranged inside the receiving groove 3, one end of the locking rod 303 extends to the inside of the locking groove 203, and the position of the locking rod 303 corresponds to the position of the sliding block 204. A certain gap should be left between the locking rod 303 and the sliding block 204 to automatically fine-tune the clamping block 105.

[0033] To prevent the clamping block 105 from rotating, the operator can rotate the locking screw 301, which will drive the locking plate 302 toward the elastic member 202, thereby causing the locking plate 302 to move the locking rod 303. When the top of the locking rod 303 contacts the bottom of the sliding block 204, the self-locking nature of the locking screw 301 prevents the sliding block 204 from further compressing the elastic member 202, thereby preventing the clamping block 105 from rotating and achieving the desired locking effect. This method also allows the operator to fine-tune the rotation angle of the clamping block 105, ensuring a close fit between the clamping block 105 and the workpiece surface. This further enhances the clamping effectiveness of the pliers, preventing the workpiece from falling off during machining, and thus improving safety.

[0034] To prevent the locking plate 302 from shifting during movement, a guide rod 304 is fixedly connected to the inner wall of the accommodating groove 3, and the locking plate 302 is slidably connected to the guide rod 304. The provision of the guide rod 304 limits the freedom of the locking plate 302, so that it can only move along the axial direction of the guide rod 304, thereby preventing the locking plate 302 from shifting or misaligning during movement, thereby improving the stability and reliability of the locking mechanism under long-term use.

[0035] Secondly, to facilitate the operator's rotation of the locking screw 301, a countersunk groove 305 is provided on the side of the movable jaw 102 away from the clamping block 105. The side of the locking screw 301 away from the elastic member 202 extends into the countersunk groove 305 and is fixedly connected to a rotating block 306. The side of the rotating block 306 away from the locking screw 301 is provided with a hexagonal socket 307. The placement of the rotating block 306 in the countersunk groove 305 makes the outer surface of the movable jaw 102 neater, thereby improving its aesthetic appearance. The provision of the hexagonal socket 307 enables the operator to use the corresponding model of hexagonal wrench to rotate the locking screw 301, facilitating operation.

[0036] Working principle:

[0037] During specific use, the reference surface of the workpiece is placed against one side of the fixed jaw 101, and then the first screw 104 is rotated to push the movable block 103, driving the movable jaw 102 and the clamping block 105 to gradually clamp the workpiece. As the movable jaw 102 is gradually advanced, the clamping block 105 will fit tightly with the corresponding end face of the clamped workpiece. If the parallelism of the two side faces of the workpiece differs significantly, the clamping block 105 set on the movable block 103 will automatically fine-tune the angle around the rotating shaft 106, so that the clamping block 105 and the end face of the clamped workpiece fit tightly. This improves the clamping effect of the flat-nose pliers on the workpiece, reduces the risk of the workpiece loosening during processing, and improves safety.

[0038] Subsequently, the operator can use a hexagonal wrench to rotate the locking screw 301, which will drive the locking plate 302 toward the elastic member 202, thereby causing the locking plate 302 to drive the locking rod 303 to move. When the top of the locking rod 303 contacts the bottom of the sliding block 204, due to the self-locking nature of the locking screw 301, the sliding block 204 will be affected by the locking screw 303 and will be unable to further compress the elastic member 202, thereby preventing the clamping block 105 from rotating and achieving the purpose of locking. Secondly, a rubber pad 308 can be provided on the side of the locking rod 303 near the sliding rod 201, and the rubber pad 308 is fixedly connected to the locking rod 303. Because the rubber pad 308 is compressible, the operator can add a certain amount of preload force when rotating the locking screw 301, thereby improving the locking effect of the locking mechanism. In addition, the locking mechanism can also help the staff fine-tune the rotation angle of the clamping block 105 to ensure that the clamping block 105 fits tightly against the workpiece surface, further improving the clamping effect of the flat-nose pliers and making the workpiece less likely to fall off during processing, thereby enhancing safety.

[0039] When the machining is complete, the first lead screw 104 is rotated in the reverse direction, causing the movable jaw 102 and the clamping block 105 to gradually release the workpiece. The locking lead screw 301 is then rotated in the reverse direction, causing the locking rod 303 to disengage from the sliding block 204. The elastic member 202 then gradually recovers its deformation, causing the sliding rod 201 to move in the reverse direction. The sliding rod 201, via the first connecting rod 2, drives the clamping block 105 to rotate to its original position, thereby maintaining the plane of the clamping block 105 parallel to the plane of the fixed jaw 101.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A precision flat-nose pliers, comprising a pliers body (1), wherein the top of the pliers body (1) is provided with a fixed jaw (101) and a movable jaw (102), the bottom of the movable jaw (102) is provided with a movable block (103), and the movable block (103) is threadedly connected to a first lead screw (104), characterized in that: A clamping block (105) is provided on one side of the movable jaw (102) close to the fixed jaw (101), and the clamping block (105) is rotatably connected to the movable block (103) via a rotating shaft (106). A locking mechanism is provided on the movable jaw (102) for preventing the clamping block (105) from rotating.

2. The precision flat-nose pliers according to claim 1, characterized in that: The clamping block (105) is connected to the movable jaw (102) through a connecting rod assembly, and the connecting rod assembly includes a first connecting rod (2) having one end rotatably connected to the clamping block (105), a sliding rod (201) rotatably connected to the other end of the first connecting rod (2), and an elastic member (202). A locking groove (203) is provided inside the clamping block (105), one end of the elastic member (202) abuts against a side of the locking groove (203) away from the clamping block (105), and the other end of the elastic member (202) abuts against a side of the sliding rod (201) away from the first connecting rod (2).

3. The precision flat-nose pliers according to claim 2, characterized in that: One end of the sliding rod (201) is arranged in the locking groove (203), and the other end of the sliding rod (201) extends to the outside of the movable jaw (102). The first connecting rod (2) is rotatably connected to the side of the sliding rod (201) away from the movable jaw (102). The sliding rod (201) is fixedly connected to a sliding block (204) on one side inside the locking groove (203), and the sliding block (204) is slidably connected to the inner wall of the locking groove (203). The cross section of the sliding block (204) is a square structure.

4. The precision flat-nose pliers according to claim 3, characterized in that: The sliding block (204) is provided with a mounting groove (205) on one side opposite to the locking groove (203), and both ends of the elastic member (202) are fixedly connected to the inside of the corresponding mounting groove (205).

5. The precision flat-nose pliers according to claim 3, characterized in that: A receiving groove (3) is provided on a side of the locking groove (203) away from the sliding rod (201), and the receiving groove (3) is communicated with the interior of the locking groove (203), and the locking mechanism comprises a locking screw (301) rotatably connected to the inner wall of the receiving groove (3), a locking plate (302) threadedly connected to the locking screw (301), and a locking rod (303) arranged on the locking plate (302), the locking plate (302) being arranged inside the receiving groove (3), one end of the locking rod (303) extending into the interior of the locking groove (203), and the position of the locking rod (303) corresponding to the position of the sliding block (204).

6. The precision flat-nose pliers according to claim 5, characterized in that: A guide rod (304) is fixedly connected to the inner wall of the accommodating groove (3), and the locking plate (302) is slidably connected to the guide rod (304).

7. The precision flat-nose pliers according to claim 5, characterized in that: A countersunk groove (305) is provided on the side of the movable jaw (102) away from the clamping block (105); a side of the locking screw (301) away from the elastic member (202) extends into the countersunk groove (305) and is fixedly connected to a rotating block (306); a side of the rotating block (306) away from the locking screw (301) is provided with an inner hexagonal groove (307).

8. The precision flat-nose pliers according to claim 7, characterized in that: A scale line (4) is provided on the top of the pliers body (1).

9. The precision flat-nose pliers according to claim 7, characterized in that: A rubber pad (308) is fixedly connected to one side of the locking rod (303) close to the sliding rod (201).

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