Multi-purpose pliers jaw structure

Abstract

To provide a clamping part structure of universal pliers having high response speed and performance in clamping operation. [Solution] The clamping structure of the universal pliers includes a clamp body 10. The clamp body includes a first handle 20, a fixed clamp 30, a movable clamp 40, an elastic member 60, a second handle 70, an unlocking member 80, a connecting rod member 90, and a lead screw 24. The gripping portion 21 of the first handle has a fixed head 22 at one end and a screw hole 23 at the other end. The fixed clamp has a fixed jaw 31 that is fixed on the fixed head and extends to the outside of the fixed head. A first clamping surface 32 is provided on one side of the fixed jaw. The movable clamp is a clamp body having a substantially triangular shape with three corners, and one of the three corners is provided with a pivoting portion 41 to which the fixed head is pivotally attached, the other corner is provided with a first pivoting portion 42, and the remaining corner is provided with a movable jaw 43.

Description

[Technical field]

[0001] This invention relates to a jaw structure of a universal pliers, and in particular to a jaw structure of a universal pliers that has a wide range of applications for woodworking clamps and has high response speed and performance in clamping operations. [Background technology]

[0002] Conventional universal pliers (e.g., Patent Document 1) have a fixed jaw, a movable jaw that can be swung open or closed relative to the fixed jaw, a toggle link locking member that is pivotally attached to the movable jaw and extends to the fixed jaw and abuts against its free end, and an adjustment screw that is rotatably screwed into the fixed jaw in correspondence with the toggle link locking member.

[0003] The fixed jaw has a first handle and a fixed jaw connected to one end of the first handle, and the movable jaw has a second handle that opens relative to the first handle and a movable jaw that opens and closes relative to the fixed jaw and is pivotally connected between one end of the second handle and the fixed jaw.

[0004] The adjustment screw has a lead screw that abuts the free end of the toggle link locking member and is rotatably screwed into the first handle, and a cylindrical adjustment button at one end of the first handle that is connected in the opposite direction to the toggle link locking member and exposes the lead screw.

[0005] In actual use, first, the fixed jaw and the movable jaw are opened, the work to be clamped is positioned between the fixed jaw and the movable jaw, and then force is applied to the first and second handles, so that the work can be clamped securely. Next, by turning the adjustment screw adjustment knob, the force applied to the work by the fixed jaw and the movable jaw increases, so that the work can be securely fixed and clamped without having to continue to apply force by the first and second handles, and this makes it possible to adjust the force applied to the work clamped and fixed by the fixed jaw and the movable jaw.

[0006] The conventional universal pliers described above can clamp a workpiece by gripping the first and second handles to apply force and operating the fixed and movable jaws, but the joint surface where the fixed and movable jaws clamp the workpiece is a flat surface with horizontal jagged edges, so it is not designed to prevent the workpiece from coming off when clamping a circular workpiece. As a result, the workpiece may slip or, after clamping the workpiece, may come off the opening direction of the jaws due to the intervention of an external force (e.g., a collision). In this way, the jaws in the above-mentioned Patent Document 1 still have the same design, so there is a similar problem. In Patent Document 2, in order to improve the above-mentioned drawbacks, the work clamping surfaces of the first and second operating blocks are formed into first and second sawtooths having a corresponding "L" shape, but since the bending point of the "L"-shaped clamping surfaces is located inside the center of the jaws, it was necessary to increase the operating angle of the first and second handles so that the work can be inserted into the opening of the jaws to be operated. Therefore, the opening and closing of the larger jaws has the drawback of slow response of the clamping operation when actually operated, and when the jaws are closed, the mouth is shaped approximately as a square, making it difficult to clamp a small-sized circular rod or circular tube, which adversely affected the range of application of the work. In particular, since the "L"-shaped clamping surfaces are bent surfaces where straight lines intersect, when clamping a non-circular workpiece, the force of the sawtooth to bite into the workpiece is insufficient, which may adversely affect the clamping force.

[0007] In view of this situation, the inventor of the present invention has utilized his many years of experience and knowledge in manufacturing and design in related fields to come up with various innovative ideas to complete the present invention. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Taiwan Utility Model Publication No. M449066 [Patent Document 2] Taiwan Patent No. I411498 Summary of the Invention [Problem to be solved by the invention]

[0009] The main object of the present invention is to provide a clamping structure for universal pliers which has good strength and holding power due to the tooth dimensions of the anti-engagement serrations and anti-pressure serrations, making it possible to manufacture clamps with a wide variety of dimensional standards and which provides an excellent clamping effect on the workpiece. [Means for solving the problem]

[0010] In order to solve the above problems, according to a first aspect of the present invention, there is provided a jaw structure for universal pliers including a clamp body, the clamp body including a first handle, a fixed clamp, a movable clamp, an elastic member, a second handle, an unlocking member, a connecting rod member and a lead screw, the gripping portion of the first handle has a fixed head at one end and a screw hole at the other end, the fixed clamp has a fixed jaw that is fixed onto the fixed head and extends to the outside of the fixed head, a first clamping surface is provided on one side of the fixed jaw, and the movable clamp has three corners. The clamp body is substantially triangular, and one of the three corners is provided with a pivot part for pivotally mounting the fixed head, the other corner is provided with a first pivot part, and the remaining corner is provided with a movable jaw, and a traction part is provided between the pivot part and the first pivot part, and the movable jaw is provided opposite the first clamping surface and has a second clamping surface, and the second clamping surface moves toward or away from the first clamping surface as the movable jaw swings, and by swinging the movable jaw and adjusting the distance between the first clamping surface and the second clamping surface, the opening size of the gripping portion can be determined, and the elasticity of the elasticity of the clamp body is improved. a second pivot pin is provided at one end of the gripping portion and the other end is connected to the towing portion and pulled, and the movable jaw is swung and then returned to its original position; the gripping portion of the second handle has a first pivot pin at one end to pivot the first pivot portion, a second pivot pin at a location a certain distance away from the tail portion of the other end, and a third pivot pin is provided between the first pivot pin and the second pivot pin; the unlocking member is pivotally attached to the second pivot pin and has a push portion provided at one end of the pivot position and an unlocking operation portion provided at the other end; and the connecting rod member has an arc-shaped protrusion portion corresponding to the push portion; The arcuate convex portion has one end pivotally attached to the third pivot pin and the other end extending to the gripping portion, the lead screw is screwed into the screw hole, one end abuts the stopper portion on the gripping portion and the other end extends from the screw hole to form a rotation operation portion, the first clamping surface and the second clamping surface form inner abutment surfaces and outer abutment surfaces that abut against each other, and the inner abutment surfaces and the outer abutment surfaces that abut against each other jointly form a clamping reference line and a bending center point on the clamping reference line, and the first clamping surface has a radius of 4.5 to 5.The clamping reference line at the end of the inner contact surface is tangent to the concave arc line with an included angle of 16 to 18 degrees, thereby defining the inner clamping surface. Between the end of the outer contact surface and the concave arc line, a convex arc curve is provided tangent to the concave arc line, thereby defining the outer clamping surface. The distance from the intersection of the inner oblique line and the clamping reference line to the bending center point is 1.1 to 1.5 times the distance from the bending center point to the outer contact surface. The inner clamping surface is 1.4 times larger than the first clamping surface, and the inner clamping surface is arranged such that a plurality of teeth are connected to each other, the teeth are facing away from the outer abutting surface, and the apex of the teeth is located on the horizontal stripe ratchet tooth-shaped anti-engagement jagged edge on the inner oblique line, and the bending surface and the outer clamping surface are arranged such that a plurality of teeth are connected to each other, and the apex of the teeth is located on the horizontal stripe pyramid-shaped pressing jagged edge on the concave arc line and the convex arc curve, and the second clamping surface is 1.4 times larger than the first clamping surface via the clamping reference line. The structure is a mirror image symmetrical structure, and the folding surface is defined by the concave arc line of the same radius formed by the folding center point at the same position, the inner clamping surface is defined by the concave arc line to which the inner oblique line having an included angle of 16 to 18 degrees is tangent on the clamping reference line of the end of the inner abutting surface, and the outer clamping surface is defined by similarly providing the convex arc curve tangent to the concave arc line between the end of the outer abutting surface and the concave arc line. The present invention provides a jaw structure for universal pliers, characterized in that the distance from the intersection with the directrix to the folding center point is 1.1 to 1.4 times the distance from the folding center point to the outer contact surface, the inner clamping surface is constituted by the anti-engagement serrations of the same tooth type, a plurality of which are connected to each other and arranged, and the folding surface and the outer clamping surface are constituted by a plurality of anti-pressure serrations of the corresponding tooth type which are connected to each other.

[0011] It is preferable that the radius of the concave arc line of the first clamping surface and the second clamping surface is 5 mm±0.2 mm, and the radius of curvature of the convex arc curve is 16 mm±0.2 mm.

[0012] It is preferable that the concave arc is formed at the folding center point on the clamping reference line, the distance from the intersection of the inner oblique line and the clamping reference line to the folding center point is 1.2 to 1.3 times the distance from the folding center point to the outer abutment surface, and the included angle between the inner oblique line and the clamping reference line is 17 degrees ± 0.2 degrees.

[0013] The distance between the apexes of the teeth of the multiple anti-engagement serrations on the inner clamping surface portion is defined as the ratchet tooth pitch, the vertical distance from the apex of the tooth to the root is defined as the ratchet tooth height, the ratchet tooth pitch is 2.5 mm ± 0.2 mm, the ratchet tooth height is 1.4 mm ± 0.2 mm, the distance between the apexes of the teeth of the multiple pressure serrations on the outer clamping surface portion is defined as the pressure tooth pitch, the vertical distance from the apex of the tooth to the root is defined as the pressure tooth crest height, the pressure tooth pitch is 2.7 mm ± 0.2 mm, and the pressure tooth crest height is 1.4 mm ± 0.2 mm, and it is preferable that the tooth crests of the pressure serrations on the bending surface portion are arranged along the concave arch line and form a tooth shape in which the anti-engagement serrations of the inner clamping surface portion and the pressure serrations of the outer clamping surface portion abut against each other. Effect of the Invention

[0014] The jaw structure of the universal pliers of this invention has good strength and holding power due to the tooth dimensions of the anti-engagement serrations and anti-pressure serrations, so clamps with a wide variety of dimensional standards can be manufactured, and excellent clamping effect can be obtained for the workpiece. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing a jaw structure of a universal pliers according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a state in which the jaw structure of the universal pliers according to one embodiment of the present invention is opened. [Diagram 3] FIG. 3 is a cross-sectional view showing a state in which the jaws of the jaw structure of the universal pliers according to one embodiment of the present invention are closed. [Figure 4] FIG. 4 is a perspective view showing a fixed jaw structure of a clamping portion structure of a universal pliers according to one embodiment of the present invention. [Diagram 5] FIG. 5 is a plan view showing a fixed jaw structure of a clamping portion structure of a universal pliers according to one embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged view of part Ea in FIG. [Figure 7] FIG. 7 is a perspective view showing a movable jaw structure of a clamping portion structure of a universal pliers according to one embodiment of the present invention. [Figure 8] FIG. 8 is a plan view showing a movable jaw structure of a clamping portion structure of a universal pliers according to one embodiment of the present invention. [Figure 9] FIG. 9 is an enlarged view of part Eb in FIG. [Figure 10] FIG. 10 is an explanatory diagram showing a state in which a circular workpiece is inserted into the jaw portion of the jaw portion structure of the universal pliers according to one embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory diagram showing a state before a circular workpiece is inserted into the jaw portion of the jaw structure of the universal pliers according to one embodiment of the present invention and clamped. [Figure 12] FIG. 12 is an explanatory diagram showing a state in which a circular workpiece is inserted into the jaws of the universal pliers jaw structure according to one embodiment of the present invention and clamping is completed. [Figure 13] FIG. 13 is an explanatory diagram showing a state in which a small circular workpiece is clamped by the jaw portion of the jaw portion structure of the universal pliers according to one embodiment of the present invention. [Figure 14] FIG. 14 is an explanatory diagram showing a state in which a large workpiece having a non-circular shape is clamped by the jaw portion of the jaw portion structure of the universal pliers according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In order to more completely and clearly disclose the technical means of the present invention and the effects achievable thereby, the present invention will be described in detail below in conjunction with the accompanying drawings and symbols disclosed.

[0017] Please refer to Figures 1 and 2. As shown in Figures 1 and 2, a clamp structure of a universal pliers according to one embodiment of the present invention includes a clamp body 10. The clamp body 10 includes a first handle 20, a fixed clamp 30, a movable clamp 40, an elastic member 60, a second handle 70, an unlocking member 80, a connecting rod member 90, and a lead screw 24.

[0018] The grip portion 21 of the first handle 20 has a fixed head 22 provided at one end and a screw hole 23 provided at the other end.

[0019] The fixed clamp 30 has a fixed jaw 31 that is fixed on the fixed head 22 and extends to the outside of the fixed head 22. A first clamping surface 32 is provided on one side of the fixed jaw 31.

[0020] The movable clamp 40 is a clamp body having a substantially triangular shape with three corners. One of the three corners is provided with a pivot part 41 for pivotally mounting the fixed head 22, the other corner is provided with a first pivot part 42, and the remaining corner is provided with a movable jaw 43. A traction part 44 is provided between the pivot part 41 and the first pivot part 42. The movable jaw 43 is provided opposite the first clamping surface 32 and has a second clamping surface 45. The second clamping surface 45 moves closer to or away from the first clamping surface 32 as the movable jaw 43 swings. The size of the opening of the clamping part 50 can be determined by swinging the movable jaw 43 and adjusting the distance between the first clamping surface 32 and the second clamping surface 45.

[0021] An elastic member 60 (ideally a tension spring) has one end fixed on the gripping portion 21 and the other end connected to the traction portion 44 and is pulled, so that the movable jaw 43 is returned to its original position after swinging.

[0022] The gripping portion 71 of the second handle 70 has a first pivot pin 72 at one end to which the first pivot portion 42 is pivotally attached, and a second pivot pin 73 at the other end at a position a certain distance away from the tail portion. A third pivot pin 74 is provided between the first pivot pin 72 and the second pivot pin 73.

[0023] The unlocking member 80 has a middle portion pivotally mounted on the second pivot pin 73, and has a push portion 81 provided at one end of the pivotal mounting position and an unlocking operation portion 82 provided at the other end.

[0024] The connecting rod member 90 has an arcuate protrusion 91 corresponding to the push portion 81. The arcuate protrusion 91 has one end pivotally attached to the third pivot pin 74 and the other end having a stopper portion 92 extending to the grip portion 21.

[0025] The lead screw 24 is screwed into the threaded hole 23 , one end of which abuts against the stopper portion 92 on the grip portion 21 , and the other end of which extends from the threaded hole 23 to form a rotation operation portion 240 .

[0026] Please refer to Figures 2 and 3. As shown in Figures 2 and 3, the first clamping surface 32 and the second clamping surface 45 are formed with inner abutment surface portions 320, 450 and outer abutment surface portions 321, 451 that abut against each other, and the inner abutment surface portions 320, 450 and outer abutment surface portions 321, 451 that abut against each other jointly form a clamping reference line B and a folding center point C on the clamping reference line B.

[0027] As shown in Figs. 4 and 5, the first clamping surface 32 forms a concave arc C1 with a radius R1 of 4.5 to 5.5 mm by the folding center point C, and defines the folding surface portion 322. The clamping reference line B at the end of the inner contact surface portion 320 has an inner oblique line I1 with an included angle α1 of 16 to 18 degrees that is in contact with the concave arc C1, and defines the inner clamping surface portion 323. Between the end of the outer contact surface portion 321 and the concave arc C1, a convex arc curve A1 is provided that is in contact with the concave arc C1, and defines the outer clamping surface portion 324. The distance D1 from the intersection of the inner oblique line I1 and the clamping reference line B to the folding center point C is 1.1 to 1.4 times the distance D2 from the folding center point C to the outer contact surface portion 321. A plurality of inner clamping surfaces 323 are connected and arranged with their teeth facing away from the outer contact surface portion 321. The apex of the tooth is located at the horizontally striped ratchet tooth-shaped anti-engagement jagged edge 33 on the inner oblique line I1. The bending surface portion 322 and the outer clamping surface portion 324 are arranged in a connected manner, and the apex of the tooth is located at the horizontally striped pyramidal pressing jagged edge 34 on the concave arc line C1 and the convex arc curve A1.

[0028] 2, 5, 7 and 8, the second clamping surface 45 has a mirror-symmetrical structure of the first clamping surface 32 with respect to the clamping reference line B, and defines a folded surface portion 452 by a concave arc line C2 of the same radius R2 (R1=R2) formed by the bending center point C at the same position, and defines an inner clamping surface portion 453 by the concave arc line C2 that is in contact with an inner oblique line I2 with an included angle α2 (α1=α2) of 16 to 18 degrees on the clamping reference line B at the end of the inner abutting surface portion 450. A convex arc curve A2 that is in contact with the concave arc line C2 is similarly provided between the end of the outer abutting surface portion 451 and the concave arc line C2 to define an outer clamping surface portion 454. A distance D3 from the intersection of the inner oblique line I2 and the clamping reference line B to the folding center point C is 1.1 to 1.4 times the distance D4 from the folding center point C to the outer contact surface portion 451. The inner clamping surface portion 453 is formed of a plurality of the same tooth-shaped anti-engagement jagged edges 46 that are connected and arranged with each other. The folding surface portion 452 and the outer clamping surface portion 454 are formed of a plurality of tooth-shaped anti-pressure jagged edges 47 that are connected and correspond to each other.

[0029] Please refer to Fig. 10. As shown in Fig. 10, when clamping the workpiece 11A, which is a circular rod or a circular tube, using the clamp body 10, the circular shape of the workpiece 11A is pressed by the rotation operation part 240 of the lead screw 24, the opening dimension of the gripping part 50 is appropriately adjusted, and the bending center point C formed by the first clamping surface 32 and the second clamping surface 45 is shifted toward the opening direction of the gripping part 50, as shown in Figs. 3, 5 and 8, and the bending surface parts 322, 452 and the outer clamping surface parts 324, The apex of each tooth of the multiple pressure serrations 34, 47 connected and arranged on 454 is formed on the concave arc lines C1, C2 and the convex arc curves A1, A2 in a non-linear manner, and as shown in Figures 11 and 12, when the first handle 20 and the second handle 70 are brought close to each other and gripped tightly with force, the workpiece can be clamped without slipping due to the small output swing angle range (even if an external force is applied, the workpiece 11A is prevented from slipping out of the gripping portion 50). As shown in Fig. 13, even if the workpiece 11B is a smaller circular rod or tube (see Fig. 5 and Fig. 8), when the pressing serrations 34, 47 arranged on the concave arc lines C1, C2 and the convex arc curves A1, A2 are closed, a slit-shaped gripping portion 50 is formed, so that the clamping operation can be effectively performed or terminated (when the unlocking member 80 is pushed down, the push portion 81 pushes the arc convex portion 91 of the connecting rod member 90, and the state shown in Fig. 11 is restored and unlocked). Furthermore, as shown in Fig. 14, for other large workpieces 11C having non-circular shapes, the pressing serrations 34, 47 of the outer clamping surface portions 324, 454 formed on the convex arc curves A1, A2 in a non-linear manner are used, and the workpieces naturally match the shape of the workpiece, so that the clamping operation can be performed with a strong force. As shown in FIGS. 10 to 14, the clamping range of workpieces 11A, 11B, and 11C is wide, and the response speed and performance of the clamping operation can be improved.

[0030] In the above-mentioned embodiment, preferably, as shown in Figs. 4, 5, 7 and 8, the radii R1, R2 of the concave arc lines C1, C2 of the first clamping surface 32 and the second clamping surface 45 are 5 mm ± 0.2 mm. The curvature radii of the convex arc curves A1, A2 are 16 mm ± 0.2 mm. As shown in Figs. 10 to 13, when clamping the workpiece 11A of a circular rod or a circular tube housed in the bending surface portion 322, 452, the pressing serrations 34, 47 on the outer clamping surface portion 324, 454 are naturally pushed toward the counter-engagement serrations 33, 46 of the inner clamping surface portion 323, 453 on the surface of the workpiece 11A, so that even if the workpiece 11B is small, having a diameter of 1 cm, the tool of the clamp body 10 can be smoothly clamped. As shown in Figs. 5 and 8, the above-mentioned concave arc lines C1, C2 are formed at the bending center point C on the clamping reference line B. The distances D1, D3 from the intersections of the inner oblique lines I1, I2 and the clamping reference line B to the bending center point C are 1.2 to 1.3 times the distances D2, D4 from the bending center point C to the outer abutment surface portion 321, 451 (D1 is 1.2 to 1.3 times D2, and D3 is 1.2 to 1.3 times D4). The angles α1, α2 formed by the inner oblique lines I1, I2 and the clamping reference line B are 17 degrees ± 0.2 degrees. See also FIG. 3. The bending center point C is shifted toward the opening direction of the jaw portion 50, and the ratio of the outer clamping surface portion 324, 454 and the inner clamping surface portion 323, 453 is made to a good matching state, and the clamp body 10 is manufactured in different sizes (ideally large, medium, and small sizes) so that it can clamp workpieces of various sizes including circular rods or circular tubes. As shown in Figures 5, 6, 8 and 9, the distance between the tooth apexes of the multiple counter-engagement serrations 33, 46 on the inner clamping surface 323, 453 is defined as the ratchet tooth pitch S1, S2, and the vertical distance from the tooth apex to the root is defined as the ratchet tooth height H1, H2. The ratchet tooth pitch S1, S2 is 2.5 mm ± 0.2 mm. The ratchet tooth height H1, H2 is 1.4 mm ± 0.2 mm. The distance between the tooth apexes of the multiple pressing serrations 34, 47 on the outer clamping surface 324, 454 is defined as the pressing tooth pitch S3, S4. The vertical distance from the tooth apex to the root is defined as the pressing tooth crest height H3, H4. The pressing tooth pitch S3, S4 is 2.7 mm ± 0.2 mm. The crimping tooth heights H3 and H4 are 1.4 mm±0.2 mm.Furthermore, the pressing serrations 34, 47 of the bending surface portions 322, 452 have tooth apexes arranged along the concave arc lines C1, C2, and form tooth shapes in contact with the anti-engagement serrations 33, 46 of the inner clamping surface portions 323, 453 and the pressing serrations 34, 47 of the outer clamping surface portions 324, 454. The tooth shape dimensions of the anti-engagement serrations 33, 46 and the pressing serrations 34, 47 can be adapted to various workpieces, resulting in high strength and good holding power, allowing clamps of various dimensional standards to be produced, and providing good clamping of the workpiece.

[0031] The preferred embodiments of the present invention have been disclosed above so that those skilled in the art can understand, but they are not intended to limit the present invention. Various changes and modifications can be made within the scope of the present invention. Therefore, the scope of the utility model registration claims of the present invention should be broadly interpreted to include such changes and modifications. [Explanation of symbols]

[0032] 10 Clamp body 11A Work 11B Work 11C Work 20 First Handle 21 Gripping part 22 Fixed head 23 Screw hole 24 Lead screw 30 Fixed clamp 31 Fixed Jaw 32 First clamping surface 33 Anti-engagement serrations 34 Pressed Jagged Edges 40 Movable clamp 41 Pivot joint 42 First pivot part 43 Movable Jaw 44 Traction section 45 Second clamping surface 46 Anti-engagement serrations 47 Anti-pressure jagged 50 Grip 60 Elastic member 70 Second Handle 71 Grip part 72 First support pin 73 Second support pin 74 3rd support pin 80 Unlocking Parts 81 Push part 82 Unlock operation unit 90 Connecting rod parts 91 Arc convex part 92 Stopper part 240 Rotation control unit 320 Inner contact surface part 321 Outer contact surface part 322 Bending surface 323 Inner clamping surface part 324 Outer clamping surface part 450 Inner contact surface 451 Outer contact surface part 452 Bending surface 453 Inner clamping surface part 454 Outer clamping surface part A1 convex arc curve A2 convex arc curve B Gripping reference line C Fold center point C1 concave arc wire C2 concave arc D1 Distance D2 distance D3 Distance D4 Distance H1 ratchet tooth height H2 ratchet tooth height H3 crest height H4 crest height I1 Inner diagonal line I2 inner diagonal line S1 ratchet tooth pitch S2 ratchet tooth pitch S3 pressure tooth pitch S4 pressure tooth pitch α1 included angle α2 included angle

Claims

1. A clamping structure of a universal pliers including a clamp body, The clamp body includes a first handle, a fixed clamp, a movable clamp, an elastic member, a second handle, an unlocking member, a connecting rod member, and a lead screw. The grip portion of the first handle has a fixed head portion at one end and a screw hole at the other end, The fixed clamp has a fixed jaw that is fixed on the fixed head and extends to the outside of the fixed head, and a first clamping surface is provided on one side of the fixed jaw. the movable clamp is a clamp body having a substantially triangular shape with three corners, one of which has a pivot portion for pivotally mounting the fixed head, the other corner having a first pivot portion, and the remaining corner having a movable jaw, with a traction portion provided between the pivot portion and the first pivot portion, the movable jaw being disposed opposite the first clamping surface and having a second clamping surface, the second clamping surface moving toward or away from the first clamping surface as the movable jaw swings, and by swinging the movable jaw and adjusting the distance between the first clamping surface and the second clamping surface, the size of the opening of the gripping portion can be determined, The elastic member has one end fixed on the gripping portion and the other end connected to the traction portion and is pulled to swing the movable jaw and then return it to its original position. The gripping portion of the second handle has a first pivot pin at one end to pivotally mount the first pivot portion, a second pivot pin at the other end at a location spaced a certain distance from the tail portion, and a third pivot pin between the first pivot pin and the second pivot pin; the unlocking member is pivotally attached to the second pivot pin and has a push portion provided at one end of the pivotal attachment position and an unlocking operation portion provided at the other end, the connecting rod member has an arc-shaped protrusion corresponding to the push portion, the arc-shaped protrusion having one end pivotally attached to the third pivot pin and a stopper portion extending to the grip portion at the other end; the lead screw is screwed into the screw hole, one end of the lead screw abuts against the stopper portion on the grip portion, and the other end of the lead screw extends from the screw hole to form a rotation operation portion; The first clamping surface and the second clamping surface are formed with an inner contact surface portion and an outer contact surface portion that are in contact with each other, and the inner contact surface portion and the outer contact surface portion that are in contact with each other jointly form a clamping reference line and a folding center point on the clamping reference line, The first clamping surface forms a concave arc having a radius of 4.5 to 5.5 mm with the bending center point, thereby defining a bending surface portion; The clamping reference line at the end of the inner abutment surface portion is an inner oblique line having an included angle of 16 to 18 degrees that is in contact with the concave arc line, thereby defining an inner clamping surface portion; Between the end of the outer contact surface portion and the concave arc line, a convex arc curve is provided in contact with the concave arc line to define an outer clamping surface portion; a distance from an intersection of the inner oblique line and the clamping reference line to the folding center point is 1.1 to 1.4 times a distance from the folding center point to the outer contact surface portion; The inner clamping surface portion is a plurality of pieces connected to each other, the teeth are arranged back to back with respect to the outer abutting surface portion, and the apex of the teeth is located on the anti-engagement jagged edge of the horizontal stripe ratchet tooth shape on the inner oblique line, The bending surface portion and the outer clamping surface portion are arranged in a plurality of pieces connected to each other, and the apex of the tooth is located on the concave arc line and the convex arc curved line, and the apex of the tooth is located on the horizontally striped pyramid-shaped pressing jagged edge, The second clamping surface has a mirror-symmetrical structure to the first clamping surface with respect to the clamping reference line, and defines the folded surface portion by the concave arc line of the same radius formed by the folding center point at the same position, and defines the inner clamping surface portion by the concave arc line that is in contact with the inner oblique line having an included angle of 16 to 18 degrees on the clamping reference line at the end of the inner abutting surface portion, Between the end of the outer contact surface portion and the concave arc line, the convex arc curve tangent to the concave arc line is similarly provided to define the outer clamping surface portion, and the distance from the intersection of the inner oblique line and the clamping reference line to the folding center point is 1.1 to 1.4 times the distance from the folding center point to the outer contact surface portion, The inner clamping surface portion is constituted by a plurality of anti-engagement serrations having the same tooth shape that are connected and arranged with each other, A jaw structure of a universal pliers, characterized in that the bending surface portion and the outer clamping surface portion are composed of a plurality of tooth-shaped anti-pressure jagged edges that are connected to each other and correspond to each other.

2. The radius of the concave arc of the first clamping surface and the second clamping surface is 5 mm ± 0.2 mm; The clamping portion structure of the universal pliers according to claim 1, characterized in that the radius of curvature of the convex arc curve is 16 mm±0.2 mm.

3. the concave arc line is formed at the folding center point on the clamping reference line, and a distance from an intersection point of the inner oblique line and the clamping reference line to the folding center point is 1.2 to 1.3 times a distance from the folding center point to the outer contact surface portion; 3. The clamping structure of the universal pliers according to claim 2, wherein an included angle between the inner oblique line and the clamping reference line is 17 degrees ±0.2 degrees.

4. a ratchet tooth height being 1.4 mm±0.2 mm; a ratchet tooth pitch being 2.5 mm±0.2 mm; a ratchet tooth height being 1.4 mm±0.2 mm; a pressure tooth pitch being 2.7 mm±0.2 mm; and a ratchet tooth height being 1.4 mm±0.2 mm.

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