Large-jaw multifunctional clamp structure

Abstract

The invention provides a large-jaw multifunctional clamp structure which is a clamp and comprises a first grab handle, a shaft rod, a limiting clamp piece, a movable clamp piece, an elastic piece, a second grab handle, an unlocking piece, a connecting rod piece and a screw rod. A shaft penetrating hole is formed in the side wall of the supporting head of the first grab handle; the shaft rod penetrates through the shaft penetrating hole; the assembly part of the limiting clamp piece is attached to and assembled on the shaft rod outside the side wall, and a limiting clamp arm extends and is provided with a first chuck; a movable plier head part of the movable plier piece is arranged on the other side of the side wall, one end of the movable plier head part extends to form a movable plier arm which is provided with a second chuck, and the other end of the movable plier head part is provided with a pivoting part pivoted with the supporting head part and a first pivoting head pivoted with the second grab handle; according to the overall structure, the size of the jaw of the clamp is adjusted within the length range of the shaft rod, and the clamping and locking capacity range of the clamp on a target workpiece can be remarkably widened.

Description

Technical Field

[0001] The present invention relates to a large-jaw multi-functional pliers structure that can significantly improve the clamping ability range of the pliers for locking a target workpiece. Background Art

[0002] As described in the prior art content of the patent case with Taiwan, China certificate number TWM449066, a traditional universal clamp has a fixed plier handle 11, a movable plier handle 12 that swings relative to the fixed plier handle 11 to an open state and a closed state, an elbow locking element 13 pivotally connected to the movable plier handle 12 and extending to the fixed plier handle 11 and terminating at a free end 131, and an adjusting screw 14 rotatably screwed to the fixed plier handle 11 corresponding to the elbow locking element 13.

[0003] The fixed plier handle 11 has a first handle 111 and a fixed jaw portion 112 connected to one end of the first handle 111. The movable plier handle 12 has a second handle 121 that opens and closes relative to the first handle 111, and a movable jaw portion 122 that opens and closes relative to the fixed jaw portion 112 and is pivotally connected between one end of the second handle 121 and the fixed plier handle 11 respectively.

[0004] The adjusting screw 14 has a screw rod 141 that is rotatably screwed to the first handle 111 and against which the free end 131 of the elbow locking element 13 abuts, and a cylindrical adjusting knob 142 that is reversely connected to the elbow locking element 13 at one end of the screw rod 141 exposed from the first handle 111.

[0005] During use, the fixed plier handle 11 and the movable plier handle 12 can be opened first so that a workpiece 15 to be clamped is located between the fixed jaw portion 112 and the movable jaw portion 122. Then, by applying force to the first and second handles 111 and 121, the workpiece 15 can be firmly clamped. Next, as long as the adjusting knob 142 of the adjusting screw 14 is further rotated, the tightness of the fixed jaw portion 112 and the movable jaw portion 122 on the workpiece 15 can be increased, so that the workpiece 15 is still firmly locked and clamped without the first and second handles 111 and 121 being continuously applied with force, and the acting force applied by the fixed jaw portion 112 and the movable jaw portion 122 to the workpiece 15 that has been clamped and locked can be adjusted thereby.

[0006] Regarding the above-mentioned traditional universal clamp, although it can apply force by holding the first and second handles 111 and 121 to operate the fixed jaw part 112 and the movable jaw part 122 to clamp and lock the workpiece 15, however, its clamping ability for the workpiece 15 is limited to the workpieces within the swing angle range between the movable jaw part 122 and the fixed jaw part 112, and it is impossible to arbitrarily expand the jaws for clamping larger workpieces; even for the content of the above-mentioned patent case (TWM449066), or other conventional multi-functional pliers, such as the invention patent case of Taiwan, China Certificate No. TWI411498, they all maintain the same jaw design. Based on the mechanism or conditions of the movable jaw part swinging to clamp the workpiece, the clamping ability range of the workpiece cannot be improved by expanding the jaws because the jaw size is limited within a certain range. Summary of the Invention

[0007] The main object of the present invention is to provide a multi-functional pliers structure with large jaws to solve the above-mentioned technical problems existing in the prior art.

[0008] The present invention provides a multi-functional pliers structure with large jaws, which is a pair of pliers, characterized in that it includes:

[0009] A first handle, at one end of a C-shaped cross-section holding part, a support head is extended, and a screw hole is provided at the other end; and on the ventral side of the support head, there is a side wall, and a shaft hole is opened on the side wall.

[0010] A shaft rod, which is a long rod body with a cross-section corresponding to the shape of the shaft hole, passes through the shaft hole, is installed on the support head, and defines the axis of the long rod body as a working center line of the pair of pliers.

[0011] A limiting clamp member is located outside one side of the side wall of the support head, is arranged on the shaft rod, has an assembling part that abuts against one side of the shaft rod and is assembled and limited on the shaft rod. One end of the assembling part above the workpiece center line is far from the shaft rod and extends a limiting clamp arm. The limiting clamp arm is a U-shaped arm body, and a first chuck is provided at the end.

[0012] A movable clamp member is located on the other side of the side wall of the support head, corresponding to the assembling part of the limiting clamp member, has a movable clamp head that is the same as the assembling part and abuts against the same surface of the shaft rod. One end of the movable clamp head above the working center line is far from the shaft rod and extends a movable clamp arm, and a pivoting part pivotally connected to the support head and a first pivoting part far from the support head are respectively provided at the edge corners of the side end below the working center line; and the movable clamp arm corresponds to the limiting clamp arm and is a U-shaped arm body, and a second chuck is provided at the end of the movable clamp arm; a pulling part is provided between the pivoting part and the first pivoting part of the movable clamp head.

[0013] An elastic member, one end of which is fixedly provided on the holding portion and the other end is connected to the pulling portion, is used to pull the movable jaw member to return after swinging;

[0014] A second handle, a first pin is provided at one end of a grasping portion and pivotally connected to the first pivoting portion, and a second pin is provided at the other end at a distance from the tail portion. A third pin is provided between the first pin and the second pin;

[0015] An unlocking member, the middle portion of which is pivotally arranged with the second pin. One end of the pivotal arrangement position has a pushing portion, and the other end forms an unlocking operation portion;

[0016] A connecting rod member has an arc convex portion opposite to the pushing portion. One end of the arc convex portion is pivotally arranged with the third pin, and the other end extends to the holding portion and forms a stopping portion;

[0017] A screw rod is screwed with the screw hole. One end abuts against the stopping portion on the holding portion, and the other end extends out of the screw hole and forms a rotating operation head.

[0018] The present invention further provides a large-jaw multi-functional pliers structure. Among them, the through-hole of the support head of the first handle is a flat long hole, and the shaft rod, the cross-section of which is in a shape corresponding to the through-hole, is a long rod body of a flat iron in a shape of a ruler that can freely slide in and out through the through-hole; by forming a surface contact between the shaft rod and the movable jaw head of the movable jaw member, the swinging action of the movable jaw member can be limited or guided by the surface of the shaft rod when the movable jaw head swings, reducing shaking or deflection.

[0019] The present invention further provides a large-jaw multi-functional pliers structure. Among them, at least one column close to the shaft rod is fixedly provided above and below the working center line of the support head of the first handle; by the assistance of the at least one column for the support of the through-hole on the shaft rod, in addition to increasing the anti-hole deformation strength of the through-hole, it can also reduce the excessive inclination of the horizontal degrees at both ends of the shaft rod when the shaft rod penetrates the through-hole.

[0020] The present invention further provides a large-jaw multi-functional pliers structure. Among them, the assembly portion of the limiting jaw member is located outside one side of the side wall of the support head and is fixed on the shaft rod. The assembly portion of the limiting jaw member corresponds to the movable jaw member on the other side of the side wall; by the fixing of the assembly portion of the limiting jaw member on the shaft rod, the relationship between the first chuck and the shaft rod is fixed, so that the clamp can make left and right displacements on the through-hole of the support head by the shaft rod to adjust the size of the jaws of the clamp.

[0021] The present invention further provides a structure of a large-jaw multi-functional pliers. Among them, the assembly part of the limiting pliers element abuts against one side of the shaft rod. The assembly part is formed with a bridging body. A sleeve hole is provided on the bridging body according to the cross-sectional shape of the shaft rod opposite thereto, and the shaft rod is inserted through the sleeve hole to assemble the assembly part on the shaft rod. When the first chuck of the limiting pliers element is blocked, the assembly part slightly swings by an angle, which can cause the sleeve hole to clamp the shaft rod to form a fixing effect that cannot slide toward the distal end, so that the pliers can be displaced at the assembly position of the assembly part of the limiting pliers element on the shaft rod to adjust the size of the pliers' jaws. And an abutting plate is formed at the end of the bridging body of the above-mentioned assembly part. By the abutting plate and the assembly part jointly abutting against both sides of the shaft rod, when the first chuck is used to clamp and lock the target workpiece, the clamping of the abutting plate on the shaft rod can reduce the swing generated when the limiting pliers arm is stressed. Moreover, the first chuck is provided at the end of the limiting pliers arm extending from one end of the above-mentioned assembly part. The first chuck is nearly in a T shape and has a first clamping surface. At the opposite end of the first clamping surface, the first chuck is pivoted on the end of the limiting pliers arm by a first pivot shaft. By allowing the first chuck to swing on the end of the limiting pliers arm, even if the assembly part swings and clamps the shaft rod, the first clamping surface of the first chuck can still be placed on the target workpiece in a conforming manner.

[0022] The present invention further provides a structure of a large-jaw multi-functional pliers. Among them, the second chuck is provided at the end of the movable pliers arm of the movable pliers element. The second chuck is nearly in a T shape and has a second clamping surface. At the opposite end of the second clamping surface, the second chuck is pivoted on the end of the movable pliers arm by a second pivot shaft. By allowing the second chuck to swing on the end of the movable pliers arm, the movable pliers arm swings toward the target workpiece, and the second clamping surface of the second chuck can naturally adjust to be conforming to the target workpiece, and the clamping force is solidly transmitted to act on the target workpiece.

[0023] The present invention further provides a structure of a large-jaw multi-functional pliers. Among them, at least one end of the long rod body of the shaft rod is radially provided with a limiting and disengaging member protruding from the surface of the long rod body, and the shaft rod can be restricted from disengaging from the support head by the limiting and disengaging member.

[0024] When the second chuck of the pliers is blocked or limited, only the first handle and the second handle need to be closely held and stressed. At the initial stage of the output force, the first handle will first swing by an angle to cause the through-hole to clamp the shaft rod, so that the support head achieves a fixing effect on the shaft rod. In the later stage of the output force process, the swing of the second handle centered on the first pin, through the propping of the connecting rod member, pushes the movable pliers element to swing, and can cause the second chuck of the movable pliers arm to generate a clamping force toward the direction of the first chuck.

[0025] That is, when using the clamp to clamp the target workpiece, the shaft rod can be displaced left and right on the support head of the first handle, so that the first chuck and the second chuck are placed against the target workpiece. When starting to move the second handle closer to the first handle and apply a tightening force, the reaction force generated by the target workpiece blocking the second chuck causes the first handle to swing, so that the support head can first clamp the shaft rod through the through-hole at the initial stage of tightening the second handle, achieving the position fixation of the pivot part. In this way, during the continuous process of applying the tightening force of the second handle, by the limiting support of the connecting rod on the second handle, the first pin can make a slightly swinging motion centered on the pivot part, so that the movable clamp arm can complete the clamping action on the target workpiece through the second chuck under the condition that the limiting clamp arm and the first chuck are fixed.

[0026] For the clamp structure, within the length range of the shaft rod, the jaw size between the first chuck and the second chuck can be easily adjusted over a long distance to cope with the clamping of extra-large target workpieces, thereby significantly improving or expanding the clamping capacity range of the clamp for target workpieces. Brief Description of the Drawings

[0027] Figure 1 is the structural appearance plan view of the present invention;

[0028] Figure 2 is the combined structural diagram when the first and second handles of the present invention are in cross-section;

[0029] Figure 3 is Figure 2 the enlarged view of the structure of part A;

[0030] Figure 4 is the exploded perspective view of the structure of the limiting clamp part of the present invention;

[0031] Figure 5 is the structural plan view of the ventral side of the first handle of the present invention;

[0032] Figure 6 is the schematic diagram of the state when the second handle of the present invention is operating;

[0033] Figure 7 is Figure 6 the enlarged view of the structure of part B;

[0034] Figure 8 is the schematic diagram of the state when the jaws of the clamp of the present invention are in place against the target workpiece;

[0035] Figure 9 is the schematic diagram of the state when the second handle starts to operate after the jaws of the clamp of the present invention incorporate the target workpiece;

[0036] Figure 10 is the schematic diagram of the state of the first handle during the operation of the second handle of the present invention;

[0037] Figure 11 It is a schematic diagram of the state when the clamp of the present invention completes clamping and locking of the target workpiece.

[0038] Description of reference numerals: clamp 10; working center line CE; target workpiece 11; first grip 20; gripping portion 21; supporting head 22; side wall 220; through-shaft hole 221; screw hole 23; shaft 24; long-shaft hole 240; stopper 241; screw 25; rotation operation head 250; stopper 26; limiting clamp 30; assembly portion 31; bridging portion 310; sleeve shaft hole 311; resting plate 312; limiting clamp arm 32; first clamp head 33; first clamping surface 3 30; first pivot 331; movable pliers 40; movable pliers head 41; movable pliers arm 42; pivot portion 43; first pivot portion 44; second clamp head 45; second clamping surface 450; second pivot 451; buckle portion 46; jaw 50; elastic member 60; second handle 70; grasping portion 71; first axle pin 72; second axle pin 73; third axle pin 74; unlocking member 80; push portion 81; unlocking operation portion 82; connecting rod member 90; arc convex portion 91; stop portion 92. DETAILED DESCRIPTION

[0039] In order to achieve the above-mentioned purpose, the present invention specifically lists the preferred embodiments and describes them in detail with the accompanying drawings as follows:

[0040] like Figures 1 to 5 As shown, the present invention provides a large jaw multifunctional pliers structure, which is a clamp 10, comprising:

[0041] A first handle 20, which is a C-shaped gripping portion 21 having a support head 22 extending from one end thereof and a screw hole 23 disposed at the other end thereof; and a side wall 220 is disposed on the ventral side of the support head 22, and an axle hole 221 is disposed on the side wall 220;

[0042] A shaft 24, which is a long rod 240 with a cross section corresponding to the shape of the through-shaft hole 221, passes through the through-shaft hole 221, is installed on the support head 22, and the axis of the long rod 240 is defined as a working center line CE of the clamp 10;

[0043] A limiting clamp 30 is located outside one side of the side wall 220 of the support head 22, and is arranged on the shaft 24. It has a plate-shaped assembly part 31 that is close to the shaft 24 and is limited to the shaft 24. The assembly part 31 is located at one end above the workpiece centerline CE and is away from the shaft 24. A limiting clamp arm 32 extends. The limiting clamp arm 32 is an arm body that is nearly in an inverted shape (or U-shaped), and a first clamp 33 is provided at the end thereof;

[0044] A movable jaw member 40 is located on the other side of the side wall 220 of the support head 22, corresponding to the assembly portion 31 of the limiting jaw member 30. It has a movable jaw head 41 in the shape of a plate body that is the same as the assembly portion 31 and abuts against the same surface of the shaft 24. One end of the movable jaw head 41 above the working center line CE is far from the shaft 24 and extends with a movable jaw arm 42. At the end edge corner below the working center line CE, a pivoting portion 43 pivotally connected to the support head 22 and a first pivoting portion 44 far from the support head 22 are respectively provided. And the movable jaw arm 42 corresponds to the limiting jaw arm 32 and is an arm body nearly in the shape of a C (or U). A second chuck 45 is provided at the end. In addition, a pulling portion 46 is provided between the pivoting portion 43 and the first pivoting portion 44 of the movable jaw head 41.

[0045] An elastic member 60 (ideally a tension spring), one end of which is fixedly provided on the holding portion 21 and the other end is connected to the pulling portion 46 for pulling the movable jaw member 40 to return after swinging.

[0046] A second handle 70 has a first pin 72 provided at one end of a grasping portion 71 and pivotally connected to the first pivoting portion 44, and a second pin 73 provided at a distance from the tail at the other end. A third pin 74 is provided between the first pin 72 and the second pin 73.

[0047] An unlocking member 80 is pivotally connected to the second pin 73 at its middle portion. One end of the pivoting position has a pushing portion 81, and the other end forms an unlocking operation portion 82.

[0048] A connecting rod member 90 has an arc convex portion 91 opposite to the pushing portion 81. One end of the arc convex portion 91 is pivotally connected to the third pin 74, and the other end extends to the holding portion 21 and forms a stopping portion 92.

[0049] A screw rod 25 is screwed with the screw hole 23. One end abuts against the stopping portion 92 on the holding portion 21, and the other end extends out of the screw hole 23 and forms a rotating operation head 250.

[0050] As Figure 6 、 Figure 7 shown, when the second chuck 45 of the clamp 10 is blocked or limited (such as when contacting the target workpiece to be clamped), only the first handle 20 and the second handle 70 need to be close to each other and apply force by gripping. At the initial stage of the output force, the first handle 20 will first swing by an angle α (for this angle α, please refer to Figure 3 、 Figure 7As shown, it is determined or set by the thickness of the side wall 220 and / or the size of the gap between the through-hole 221 and the shaft rod 24. Ideally, it is about 5 degrees), causing the through-hole 221 to clamp (lock) the shaft rod 24, so that the support head 22 achieves a non-sliding fixing effect on the shaft rod 24. During the later force application process, the swing of the second handle 70 around the first pin 72 is resisted by the link member 90 to push the movable jaw 40 to swing, enabling the second chuck 70 of the movable jaw arm 42 to generate a clamping force towards the first chuck 33.

[0051] That is, as Figure 8 shown, when using the clamp 10 to clamp the target workpiece 11, the shaft rod 24 can be slid left and right on the support head 22 (i.e., the through-hole 221) of the first handle 20 for adjustment (alternatively, the assembly part 31 of the limiting jaw 30 can be assembled and fixed or adjusted in position on the shaft rod 24), so that the first chuck 33 and the second chuck 45 are close to or touch the target workpiece 11; as Figure 9 、 Figure 10 shown, when starting to apply force by moving the second handle 70 towards the first handle 20 and making the grasping part 71 close to and grip the holding part 21, the reaction force generated by the stationary target workpiece 11 blocking the second chuck 45 causes the first handle 20 to deflect (please refer to Figure 6 shown, deflecting at an angle α), which will cause the support head 22 to be able to first clamp (lock) the shaft rod 24 by the through-hole 221 at the initial stage of the second handle 70 being gripped (please refer to Figure 3 、 Figure 7 shown), achieving the position fixation of the pivoting part 43; thus, as Figure 11 shown, during the continuous (continuous) force application process of gripping the second handle 70 (grasping part 71), by the limiting support of the link member 90 on the second handle 70, a slightly swinging motion can be made around the pivoting part 43 with the first pin 72 as the position point, enabling the movable jaw arm 42 to complete the clamping action on the target workpiece 11 through the second chuck 45 under the condition that the limiting jaw arm 32 and the first chuck 33 are fixed.

[0052] As Figure 2 、 Figure 11 shown, for the overall structure of the clamp 10, within the length range of the shaft rod 24, the size of the jaw 50 between the first chuck 33 and the second chuck 45 can be easily adjusted over a long distance to accommodate the clamping of extra-large target workpieces 11, thereby significantly improving or expanding the clamping ability range of the clamp 0 for the target workpiece 11.

[0053] According to the above embodiments, preferably, as Figure 2 、 Figure 5As shown, the through-axis hole 221 of the support head 22 of the first handle 20 is an oblong hole, and the shaft rod 24 is a long rod body 240 of a flat iron with a cross-section corresponding to the shape of the through-axis hole 221 and can freely slide in and out of the through-axis hole 221; by forming a large-area surface contact between the shaft rod 24 and the movable jaw head 41 of the movable jaw member 40, as Figures 8 to 11 shown, when the swinging movement of the movable jaw member 40 occurs, the swinging movement of the movable jaw head 41 can be surface-limited or guided by the shaft rod 24, reducing shaking or deviation.

[0054] According to the above embodiment, preferably, as Figure 2 shown, at least one stop post 26 close to the shaft rod 24 is fixedly provided above and below the working center line CE of the support head 22 of the first handle 20 (ideally, one stop post 26 is provided on each of the upper and lower sides of the shaft rod 24); by the at least one stop post 26 assisting the support of the shaft rod 24 by the through-axis hole 221, in addition to increasing the anti-hole deformation strength of the through-axis hole 221, it can also reduce or avoid excessive tilting of the horizontal degrees at both ends when the shaft rod 24 passes through the through-axis hole 221.

[0055] According to the above embodiment, optionally, as Figure 2 shown, the assembly part 31 of the limiting jaw member 30 is fixed on the outer surface of the non-movable jaw member 40 end on one side of the side wall 220 of the support head 22 (not shown, for example, it can be fixed by screwing) on the shaft rod 24; by the fixing of the assembly part 31 of the limiting jaw member 30 on the shaft rod 24, the relationship between the first chuck 33 (including the limiting jaw arm 32) and the shaft rod 24 is fixed, so that the clamp 10 can make a left-right sliding displacement (not shown) on the through-axis hole 221 of the support head 22 by the shaft rod 24 to adjust the size of the jaw 50 of the clamp 10.

[0056] According to the above embodiment, preferably, as Figure 2 、 Figure 3 、 Figure 4 shown, on the surface of the assembly part 31 of the limiting jaw member 30 that abuts against the shaft rod 24, the assembly part 31 is formed with a bridging body 310, and a sleeve hole 311 is formed on the bridging body 310 corresponding to the cross-sectional shape of the shaft rod 24, and the shaft rod 24 is passed through the sleeve hole 311 to assemble the assembly part 31 on the shaft rod 24; as Figure 6 、 Figure 7 shown, when the first chuck 33 of the limiting jaw member 30 is blocked, the assembly part 31 is slightly deflected by an angle β, which can cause the sleeve hole 311 to clamp (lock) the shaft rod 24 to form a fixing effect that cannot slide towards the distal end, as Figure 8As shown, the clamp 10 can be slidably displaced at the assembly position of the shaft 24 by the assembly part 31 of the limiting clamp 30 to adjust the size of the jaws 50 of the clamp 10 to match the target workpiece 11; as Figure 4 shown, and an abutting plate 312 is formed at the end of the cross-connecting body 310 of the above-mentioned assembly part 31. By the abutting plate 312 and the assembly part 31 jointly abutting on both sides of the shaft 24, as Figure 1 、 Figure 11 shown, when the first chuck 33 is used to clamp the target workpiece 11, the clamping of the shaft 24 by the abutting plate can reduce the yaw generated when the limiting clamp arm 32 is stressed; as Figure 2 、 Figure 4 shown, furthermore, the first chuck 33 is provided at the end of the limiting clamp arm 32 extending from one end of the above-mentioned assembly part 31. The first chuck 33 is nearly in a T shape and has a first clamping surface 330. At the opposite end of the first clamping surface 330, the first chuck 33 is pivoted on the end of the limiting clamp arm 32 by a first pivot 331. By allowing the first chuck 33 to swing on the end of the limiting clamp arm 32, as Figure 8 、 Figure 9 shown, even if the assembly part 31 yaws and clamps the shaft 24, the first clamping surface 330 of the first chuck 33 can still be placed on the target workpiece 11 in a conforming manner.

[0057] According to the above embodiment, preferably, as Figure 2 shown, wherein, the second chuck 45 is provided at the end of the movable clamp arm 42 of the movable clamp part 40. The second chuck 45 is nearly in a T shape (equivalent to Figure 4 the structure of the first chuck 33 shown), has a second clamping surface 450, and at the opposite end of the second clamping surface 450, the second chuck 45 is pivoted on the end of the movable clamp arm 42 by a second pivot 451. By allowing the second chuck 45 to swing on the end of the movable clamp arm 42, as Figures 8 to 11 shown, when the movable clamp arm 42 swings towards the target workpiece 11, the second clamping surface 450 of the second chuck 45 can naturally or automatically adjust to conform to the target workpiece 11, and the clamping force is solidly transmitted to act on the target workpiece 11.

[0058] According to the above embodiment, optionally, as Figure 2 、 Figure 4 shown, at least one end (ideally both ends) of the long rod body 240 of the shaft 24 is radially provided with a detent member 241 (which can be a pin) protruding from the radial surface of the long rod body 240, and the shaft 24 can be restricted from disengaging from the support head 22 by the detent member 241 being unable to pass through the through-shaft hole 221.

[0059] The above description is illustrative rather than restrictive to the present invention. Those of ordinary skill in the art can understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended specification, and all of them will fall within the protection scope of the present invention.

Claims

1. A multi-functional clamp structure with a large jaw, which is a clamp, characterized in that, Comprising: A first handle, at one end of a gripping portion with a C-shaped cross-section, a supporting head is extended, and a screw hole is provided at the other end; and on the ventral side of the supporting head, there is a side wall, and a shaft-passing hole is formed on the side wall; A shaft rod, which is a long rod with a cross-section corresponding to the shape of the shaft-passing hole. It passes through the shaft-passing hole, is installed on the supporting head, and defines the axis of the long rod as a working center line of the clamp; A limiting clamp member, located outside one side of the side wall of the supporting head, is installed on the shaft rod, has an assembling portion that abuts against one side of the shaft rod and is assembled and limited on the shaft rod. One end of the assembling portion above the workpiece center line is far from the shaft rod and extends a limiting clamp arm. The limiting clamp arm is a U-shaped arm body, and a first chuck is provided at the end; A movable clamp member, located on the other side of the side wall of the supporting head, corresponding to the assembling portion of the limiting clamp member, has a movable clamp head that is the same as the assembling portion and abuts against the same side of the shaft rod. One end of the movable clamp head above the working center line is far from the shaft rod and extends a movable clamp arm. And at the edge corners of the side end below the working center line, a pivoting portion pivotally connected to the supporting head and a first pivoting portion far from the supporting head are respectively provided; and the movable clamp arm corresponds to the limiting clamp arm, is a U-shaped arm body, and a second chuck is provided at the end of the movable clamp arm; between the pivoting portion and the first pivoting portion of the movable clamp head, there is a pulling portion; An elastic member, one end of which is fixedly installed on the gripping portion, and the other end is connected to the pulling portion, for pulling the movable clamp member to swing back after swinging; A second handle, at one end of a grasping portion, a first shaft pin is provided and pivotally connected to the first pivoting portion, and a second shaft pin is provided at a distance from the tail at the other end. A third shaft pin is provided between the first shaft pin and the second shaft pin; An unlocking member, with its middle portion pivotally connected to the second shaft pin, one end of the pivotal connection position has a pushing portion, and the other end forms an unlocking operation portion; A connecting rod member, having an arc convex portion opposite to the pushing portion, one end of the arc convex portion is pivotally connected to the third shaft pin, and the other end extends to the gripping portion and forms a stopping portion; A screw rod, screwed with the screw hole, one end abuts against the stopping portion on the gripping portion, and the other end extends out of the screw hole and forms a rotating operation head.

2. The structure of the large-jaw multi-functional pliers according to claim 1, characterized in that, The shaft-passing hole of the supporting head of the first handle is a flat long hole, and the cross-section of the shaft rod corresponds to the shape of the shaft-passing hole. The shaft rod is a flat iron in the shape of a ruler that passes through the shaft-passing hole and can freely slide in and out.

3. The structure of the large-jaw multi-functional pliers according to claim 1, characterized in that, At least one stop column close to the shaft rod is fixedly installed above and below the supporting head of the first handle on the working center line.

4. The structure of the large-jaw multi-functional pliers according to claim 1, characterized in that, The assembling portion of the limiting clamp member is located outside one side of the side wall of the supporting head and is fixed on the shaft rod. The assembling portion of the limiting clamp member corresponds to the movable clamp member on the other side of the side wall.

5. The structure of the large-jaw multi-functional pliers according to claim 1, wherein The assembling portion of the limiting clamp member abuts against one side of the shaft rod. The assembling portion forms a cross-over body, and a sleeve hole is formed on the cross-over body corresponding to the cross-section shape of the shaft rod. The sleeve hole is for the shaft rod to pass through to assemble the assembling portion on the shaft rod.

6. The structure of the large-jaw multi-functional pliers according to claim 5, wherein, A resting plate is formed at the end of the cross-over body of the assembling portion.

7. The structure of the large-jaw multi-functional pliers according to claim 5, characterized in that, The end of the limiting clamp arm extending from one end of the assembly part is provided with the first chuck. The first chuck is a T-shaped body and has a first clamping surface. The opposite end of the first clamping surface pivotally mounts the first chuck on the end of the limiting clamp arm with a first pivot shaft.

8. The structure of the large-jaw multi-functional pliers according to claim 1, wherein, The end of the movable clamp arm of the movable clamp part is provided with the second chuck. The second chuck is a T-shaped body and has a second clamping surface. The opposite end of the second clamping surface pivotally mounts the second chuck on the end of the movable clamp arm with a second pivot shaft.

9. The structure of the large-jaw multi-functional pliers according to claim 1, characterized in that, At least one end of the two ends of the long rod body of the shaft rod is radially provided with a limiting and disengaging part protruding from the surface of the long rod body.

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