tongs

Abstract

A clamp includes a clamp body, a rotating rod and a switching unit. The clamp body includes a first clamp arm, a second clamp arm and a clamp holder disposed on the second clamp arm. The rotating rod includes a rod body and a clamp holder. The rod body is rotatably disposed on the first clamp arm with an axis as a center. The switching unit includes a switching member penetrating the first clamp arm and the rotating rod along the axis and used to drive the rotating rod to move along the axis. The clamp holder of the rotating rod is adjacent to the clamp holder when the rotating rod is in a first position. The inserting rod end of the rotating rod is adjacent to the clamp holder when the rotating rod is in a second position. By rotating the rotating rod relative to the clamp body between the first position and the second position, the effect of higher use variability and lower use cost is achieved.

Description

TECHNICAL FIELD

[0001] The present invention relates to a hand-held clamping tool, and more particularly to a clamping tool with changeable use modes. BACKGROUND

[0002] Referring to Figure 1 (a), a conventional C-shaped clamping tool 1a includes two clamping pieces 11 for clamping a plate-shaped material (not shown).

[0003] Referring to Figure 1 (b), a conventional oblique hole clamping tool 1b includes a plug rod 12 for inserting into an oblique hole (not shown) of a workpiece (not shown), and a spacer 13 for clamping the workpiece together with the plug rod 12.

[0004] In order to meet different use requirements, the user needs to purchase both the C-shaped clamping tool 1a and the oblique hole clamping tool 1b, which is relatively high in use cost and needs to be improved. SUMMARY

[0005] The present invention aims to provide a clamping tool with higher changeability and reduced use cost.

[0006] The clamping tool of the present invention includes a clamping tool body, a rotating rod, and a switching unit. The clamping tool body includes a first clamping arm, a second clamping arm swingable relative to the first clamping arm, and a clamping piece provided on the second clamping arm. The rotating rod is movably provided on the first clamping arm and includes a rod body and a clamping piece. The rod body is rotatably provided on the first clamping arm with an axis as the center and is movable along the axis relative to the first clamping arm. The rod body has a clamping end and a plug rod end oppositely arranged. The clamping piece is provided on the clamping end. The rotating rod is rotatable relative to the first clamping arm between a first position and a second position. When the rotating rod is in the first position, the clamping piece of the rotating rod is adjacent to the clamping piece of the clamping tool body. When the rotating rod is in the second position, the plug rod end of the rotating rod is adjacent to the clamping piece of the clamping tool body. The switching unit includes a switching piece and at least one positioning piece. The switching piece is provided on the first clamping arm along the axis and is connected to the rotating rod and used to drive the rotating rod to move along the axis relative to the first clamping arm. The positioning piece is provided on the first clamping arm and the rotating rod along the direction of the axis and is used to position the rotating rod in the first position and the second position.

[0007] The present application provides a clamp, the switcher has a switch head located at two opposite sides of the first clamping arm in the direction of the axis respectively, and a switch rod body extending from the switch head in the direction of the axis and penetrating through the first clamping arm and the rotating rod, the switch unit further comprises a spring pusher compressively sleeved on the switch rod body and elastically abutting on the first clamping arm and the switch head respectively, the spring pusher has a potential energy for constantly driving the switch head away from the first clamping arm, driving the rotating rod to approach the first clamping arm in the direction of the axis and positioning the rotating rod by penetrating through the first clamping arm and the rotating rod.

[0008] The present application provides a clamp, the switcher has a switch head located at two opposite sides of the first clamping arm in the direction of the axis respectively, and a switch rod body extending from the switch head in the direction of the axis and penetrating through the first clamping arm and the rotating rod, the switch unit further comprises a spring pusher compressively sleeved on the switch rod body and elastically abutting on the first clamping arm and the switch head respectively, the spring pusher has a potential energy for constantly driving the switch head away from the first clamping arm, driving the rotating rod to approach the first clamping arm in the direction of the axis and positioning the rotating rod by penetrating through the first clamping arm and the rotating rod.

[0009] The present application provides a clamp, the switcher has a switch head located at two opposite sides of the first clamping arm in the direction of the axis respectively, and a switch rod body extending from the switch head in the direction of the axis and penetrating through the first clamping arm and the rotating rod, the switch unit further comprises a spring pusher compressively sleeved on the switch rod body and elastically abutting on the first clamping arm and the switch head respectively, the spring pusher has a potential energy for constantly driving the switch head away from the first clamping arm, driving the rotating rod to approach the first clamping arm in the direction of the axis and positioning the rotating rod by penetrating through the first clamping arm and the rotating rod.

[0010] The present application provides a clamp, the switcher has a switch head located at two opposite sides of the first clamping arm in the direction of the axis respectively, and a switch rod body extending from the switch head in the direction of the axis and penetrating through the first clamping arm and the rotating rod, the switch unit further comprises a spring pusher compressively sleeved on the switch rod body and elastically abutting on the first clamping arm and the switch head respectively, the spring pusher has a potential energy for constantly driving the switch head away from the first clamping arm, driving the rotating rod to approach the first clamping arm in the direction of the axis and positioning the rotating rod by penetrating through the first clamping arm and the rotating rod.

[0011] The present application provides a clamp, the switcher has a switch head located at two opposite sides of the first clamping arm in the direction of the axis respectively, and a switch rod body extending from the switch head in the direction of the axis and penetrating through the first clamping arm and the rotating rod, the switch unit further comprises a spring pusher compressively sleeved on the switch rod body and elastically abutting on the first clamping arm and the switch head respectively, the spring pusher has a potential energy for constantly driving the switch head away from the first clamping arm, driving the rotating rod to approach the first clamping arm in the direction of the axis and positioning the rotating rod by penetrating through the first clamping arm and the rotating rod.

[0012] The first clamping arm has a main positioning hole extending along the direction of the axis, the rod body of the rotating rod has two sub-positioning holes arranged at intervals and extending along the direction of the axis, the positioning member has two penetrating segments respectively penetrating the first clamping arm and the rotating rod, when the rotating rod is in the first position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and one of the sub-positioning holes, and when the rotating rod is in the second position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and the other sub-positioning hole.

[0013] The first clamping arm has a main positioning hole extending along the direction of the axis, the rod body of the rotating rod has two sub-positioning holes arranged at intervals and extending along the direction of the axis, the positioning member has two penetrating segments respectively penetrating the first clamping arm and the rotating rod, when the rotating rod is in the first position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and one of the sub-positioning holes, and when the rotating rod is in the second position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and the other sub-positioning hole.

[0014] The first clamping arm has a main positioning hole extending along the direction of the axis, the rod body of the rotating rod has two sub-positioning holes arranged at intervals and extending along the direction of the axis, the positioning member has two penetrating segments respectively penetrating the first clamping arm and the rotating rod, when the rotating rod is in the first position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and one of the sub-positioning holes, and when the rotating rod is in the second position, the penetrating segments of the positioning member respectively penetrate the main positioning hole of the first clamping arm and the other sub-positioning hole. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features and effects of the present application will be apparent from the embodiments described below with reference to the drawings, in which:

[0016] Figure 1 (a) is a side view illustrating an existing C-shaped clamp;

[0017] Figure 1 (b) is a side view illustrating an existing inclined hole clamp;

[0018] Figure 2 is an exploded perspective view illustrating a first embodiment of the clamp of the present application;

[0019] Figure 3 is an assembled perspective view of the first embodiment;

[0020] Figure 4 is a partial cross-sectional view illustrating a rotating rod of the first embodiment in a first position;

[0021] Figure 5 is a schematic view illustrating the rotating rod in the first position, which is suitable for clamping a workpiece in the form of a plate;

[0022] Figure 6 is a sectional view taken along line VI-VI in Figure 4

[0023] Figure 7 with Figure 8 is a schematic view illustrating the process of switching the rotary lever from the first position to the second position;

[0024] Figure 9 is a partial sectional view illustrating the rotary lever in the second position;

[0025] Figure 10 is a sectional view taken along line X-X in Figure 9

[0026] Figure 11 is a schematic view illustrating the rotary lever in the second position, which is suitable for clamping two workpieces, one of which has an inclined hole;

[0027] Figure 12 is a perspective exploded view illustrating a second embodiment of the clamp according to the present application;

[0028] Figure 13 is an incomplete sectional view illustrating the rotary lever of the second embodiment in the first position;

[0029] Figure 14 is a view similar to Figure 13

[0030] Figure 15 is an incomplete sectional view illustrating the rotary lever in the second position;

[0031] Figure 16 is a perspective exploded view illustrating a third embodiment of the clamp according to the present application;

[0032] Figure 17 is a perspective assembled view of the third embodiment;

[0033] Figure 18 is an incomplete sectional view illustrating the rotary lever of the third embodiment in the first position;

[0034] Figure 19 is a sectional view taken along line XIX-XIX in Figure 18

[0035] Figure 20 is a schematic view illustrating that a switching member of a switching unit of the third embodiment can be used to drive the rotary lever to rotate; ​​​​

[0036] Figure 21 This is a schematic diagram illustrating the process of the rotating rod switching from the first position to the second position; and

[0037] Figure 22 This is an incomplete sectional view illustrating the rotating rod in the second position. Detailed Implementation

[0038] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description, and the terms front-back direction X, left-right direction Y, and up-down direction Z in the following description refer to user operation. Figure 3 The orientation observed during the execution of this invention is taken into account.

[0039] See Figure 2 , Figure 3 and Figure 4 The first embodiment of the clamp of the present invention includes a clamp body 2, an adjustment unit 3, a rotating rod 4 and a switching unit 5.

[0040] The clamp body 2 includes a first handle 21 extending front to back and having a front end 211 and a rear end 212 arranged in opposite directions; a first clamping arm 22 disposed at the front end 211 of the first handle 21 and extending upward first and then forward; a second clamping arm 23 pivotally disposed at the front end 211 of the first handle 21 and generally C-shaped; a second handle 24 pivotally connected to the second clamping arm 23 and extending rearward; and a clamping member 25 disposed on the second clamping arm 23. The first clamping arm 22 has a mounting end 221 away from the front end 211 of the first handle 21 in the front-rear direction X; a pivot hole 222 formed in the mounting end 221 and extending along an axis L; and a main positioning hole 223 formed in the mounting end 221, vertically spaced from the pivot hole 222, and extending along the axis L. The axis L extends in the left-right direction Y. In this first embodiment, the main positioning hole 223 of the first clamping arm 22 is located above the pivot hole 222; however, in other variations, the main positioning hole 223 may also be located below the pivot hole 222. The second clamping arm 23 has a clamping end 231 located away from the first handle 21 in the front-rear direction X and pivotally connected to the clamping member 25. The clamp body 2 also includes a distance 26 between the mounting end 221 and the clamping end 231.

[0041] The adjusting unit 3 is used to adjust the distance 26 between the clamp bodies 2, and comprises an elastic member 31, a connecting member 32, an adjusting member 33 and a releasing member 34. In the first embodiment, the elastic member 31 is a tension spring. The two ends of the elastic member 31 are respectively hooked on the first handle 21 and the second clamp arm 23. The elastic member 31 has a potential energy to always make the clamping end 231 of the second clamp arm 23 pivot in a direction away from the mounting end 221 of the first clamp arm 22. The connecting member 32 is pivotally connected to the second handle 24 and extends rearward and toward the first handle 21. The connecting member 32 has a pushing portion 321 extending downward, and a pushing end 322 located at the rear side. In the first embodiment, the adjusting member 33 is a screw. The adjusting member 33 is movably screwed on the rear end 212 of the first handle 21 and used to push the pushing end 322 of the connecting member 32. The releasing member 34 is pivotally connected to the second handle 24, and one end of the releasing member 34 is pressed by the pushing portion 321 of the connecting member 32, and the other end of the releasing member 34 is pivotable.

[0042] Referring to Figure 4 and Figure 5 , the distance 26 between the clamp bodies 2 can be adjusted by moving the adjusting member 33 forward and backward. As shown in Figure 4 , when the adjusting member 33 moves forward, the pushing end 322 of the connecting member 32 is pushed to slide forward, and the clamping end 231 of the second clamp arm 23 is pivoted toward the mounting end 221 of the first clamp arm 22, so that the distance 26 is reduced. At this time, the elastic member 31 is stretched to accumulate the potential energy. Figure 5 As shown in , when the adjusting member 33 moves backward, the elastic member 31 releases the potential energy to pull the clamping end 231 of the second clamp arm 23 to pivot away from the mounting end 221 of the first clamp arm 22, and the pushing end 322 of the connecting member 32 slides backward to abut against the adjusting member 33 to be positioned, so that the distance 26 is increased. In addition, the other end of the releasing member 34 can be pressed to make the releasing member 34 pivot and the one end of the releasing member 34 push the connecting member 32, so that the connecting member 32 is released from the positioning of the releasing member 34.

[0043] Figure 2 , Figure 4 and Figure 6The rotating rod 4 is movably disposed on the first clamping arm 22 and includes a rod body 41 and a clamping member 42. The rod body 41 is rotatably disposed on the first clamping arm 22 about the axis L and can move left and right relative to the first clamping arm 22 along the axis L. The rod body 41 has a clamping end 411 for pivoting with the clamping member 42, an insertion end 412 disposed opposite to the clamping end 411, two secondary positioning holes 413 extending along the axis L and spaced apart for communicating with the main positioning hole 223, and a connecting hole 414 extending along the axis L, located between the secondary positioning holes 413 and communicating with the pivot hole 222. One of the secondary positioning holes 413 is adjacent to the insertion end 412, and the other secondary positioning hole 413 is adjacent to the clamping end 411. The diameter of the connecting hole 414 is smaller than the diameter of the pivot hole 222 of the first clamping arm 22.

[0044] In this first embodiment, the clamping member 25 of the clamp body 2 and the clamping member 42 of the rotating rod 4 are pads.

[0045] The switching unit 5 includes a switching component 51, a positioning component 52, and a spring-pushing component 53.

[0046] The switching member 51 passes through the pivot hole 222 of the first clamping arm 22 and the connecting hole 414 of the rotating rod 4 along the axis L, and is used to drive the rotating rod 4 to move left and right along the axis L. The switching member 51 has a switching head 511 and a switching rod body 512 extending from the switching head 511 along the direction of the axis L and passing through the first clamping arm 22 and the rotating rod 4. The first clamping arm 22 is located between the rotating rod 4 and the switching head 511 in the direction of the axis L. The switching rod body 512 has a pivot section 513 passing through the pivot hole 222 of the first clamping arm 22, a connecting section 514 passing through the connecting hole 414 of the rotating rod 4 and having an outer diameter smaller than the outer diameter of the pivot section 513, and a shoulder 515 located between the pivot section 513 and the connecting section 514 and abutting against the rotating rod 4.

[0047] In this first embodiment, the outer contour of the connecting section 514 of the switching member 51 is circular, and the connecting hole 414 of the rotating rod 4 is a circular hole, so that the rotating rod 4 can rotate relative to the switching member 51 about the axis L.

[0048] In the first embodiment, the positioning member 52 is a rivet. The positioning member 52 is disposed along the axis L between the first clamping arm 22 and the rotating rod 4, and is used to position the rotating rod 4 on the first clamping arm 22. The positioning member 52 has a positioning head 521, and a positioning rod body 522 extending from the positioning head 521 along the axis L. The positioning rod body 522 has two penetrating segments 523 connected along the axis L. The first clamping arm 22 is located between the positioning head 521 and the rotating rod 4 along the axis L. One of the penetrating segments 523 is connected between the positioning head 521 and the other penetrating segment 523, and is disposed in the main positioning hole 223 of the first clamping arm 22. The other penetrating segment 523 is used to penetrate the secondary positioning hole 413 of the rotating rod 4.

[0049] The elastic pushing member 53 is compressively sleeved on the pivoting segment 513 of the switching member 51, and the two ends thereof are elastically abutted on the first clamping arm 22 and the switching head 511, respectively. The elastic pushing member 53 has a potential energy that always drives the switching head 511 to move away from the first clamping arm 22, and drives the rotating rod 4 to move along the axis L to approach the first clamping arm 22.

[0050] Referring to Figure 4 , Figures 6 to 10 , the rotating rod 4 can be rotated relative to the clamp body 2 between a first position (as shown in Figure 4 ) and a second position (as shown in Figure 9 ). As shown in Figure 4 , when the rotating rod 4 is in the first position, the clamping member 42 of the rotating rod 4 is adjacent to the clamping member 25 of the clamp body 2, and the penetrating segments 523 of the positioning member 52 are respectively penetrated in the main positioning hole 223 of the first clamping arm 22 and one of the secondary positioning holes 413 of the rotating rod 4. As shown in Figure 10 , when the rotating rod 4 is in the second position, the inserting rod end 412 of the rotating rod 4 is adjacent to the clamping member 25 of the clamp body 2, and the penetrating segments 523 of the positioning member 52 are respectively penetrated in the main positioning hole 223 of the first clamping arm 22 and the other secondary positioning hole 413 of the rotating rod 4.

[0051] During the process of switching the rotating rod 4 from the first position to the second position, the switching member 51 drives the rotating rod 4 to move away from the first clamping arm 22 along the axis L, and when the other penetrating segment 523 of the positioning member 52 is exposed between the rotating rod 4 and the first clamping arm 22 and the elastic pushing member 53 accumulates the potential energy, the rotating rod 4 is rotated relative to the switching member 51 around the axis L to the position where the insertion end 412 of the rotating rod 4 is adjacent to the clamping member 25 of the clamping body 2, and then the elastic pushing member 53 is released to drive the switching member 51 to drive the rotating rod 4 to move towards the first clamping arm 22 along the axis L, and the penetrating segment 523 of the positioning member 52 penetrates into the main positioning hole 223 of the first clamping arm 22 and the other secondary positioning hole 413 of the rotating rod 4 respectively, so as to position the rotating rod 4 in the second position.

[0052] Therefore, one hand can press the switching head 511 of the switching member 51 to drive the rotating rod 4 to move away from the first clamping arm 22 along the axis L, and the positioning member 52 is separated from any of the secondary positioning holes 413 of the rotating rod 4, and the elastic pushing member 53 accumulates the potential energy, and then the other hand can rotate the rotating rod 4 to the position where the clamping member 42 or the insertion end 412 of the rotating rod 4 is adjacent to the clamping member 25 of the clamping body 2, and then the hand force is released to release the potential energy of the elastic pushing member 53, so as to position the rotating rod 4 in the first position or the second position.

[0053] In the first embodiment, after the rotating rod 4 is driven by the switching member 51 to move away from the first clamping arm 22, the potential energy of the elastic pushing member 53 drives the switching member 51 to drive the rotating rod 4 to move towards the first clamping arm 22 and be positioned by the positioning member 52, which has the effect of facilitating operation. However, in other variants, after the rotating rod 4 is driven by the switching member 51 to move away from the first clamping arm 22, the rotating rod 4 can be manually moved towards the first clamping arm 22, and therefore the elastic pushing member 53 can be omitted.

[0054] Referring to Figure 5 and Figure 11 , the rotating rod 4 can be used to clamp different workpieces 9, 9' in the first position and the second position respectively. As shown in Figure 5 , when the rotating rod 4 is in the first position, the clamping member 42 of the rotating rod 4 is adjacent to the clamping member 25 of the clamping body 2, so that the clamping member 42 and the clamping member 25 can be used to clamp a plate-shaped workpiece 9. As shown in Figure 11As shown, the insertion rod end 412 of the rotating rod 4 is adjacent to the clamping part 25 of the clamp body 2 when the rotating rod 4 is in the second position, so that the present embodiment can be used to clamp two upper and lower stacked workpieces 9, 9', one of which has an inclined hole 91. The insertion rod end 412 is inserted into the inclined hole 91 of one of the workpieces 9', and the clamping part 25 and the insertion rod end 412 jointly clamp the workpieces 9, 9'. In this way, the rotating rod 4 can be switched to the first position or the second position as required, thereby achieving use variability.

[0055] The present application achieves the effects of higher use variability and reduced use cost by switching the rotating rod 4 relative to the clamp body 2 between the first position and the second position. Therefore, the purpose of the present application is achieved.

[0056] Referring to Figures 12 to 15 , the second embodiment of the clamp of the present application is substantially the same as the first embodiment, except that:

[0057] The number of positioning members 52 of the switching unit 5' is two. The rotating rod 4 is located between the positioning head 521 of the positioning member 52 and the first clamping arm 22 in the direction of the axis L. When the rotating rod 4 is in the first position (as shown in Figure 13 ), the penetrating segments 523 of one of the positioning members 52 are respectively penetrated into one of the secondary positioning holes 413 and the primary positioning hole 223 of the first clamping arm 22, and one of the penetrating segments 523 of the other positioning member 52 is penetrated into the other secondary positioning hole 413, and the other penetrating segment 523 is exposed. When the rotating rod 4 is in the second position (as shown in Figure 15) of one of the positioning members 52 is exposed, and the penetrating segments 523 of the other positioning member 52 are respectively penetrating the other sub-positioning hole 413 and the main positioning hole 223 of the first clamping arm 22. During the process of switching the rotating rod 4 from the first position to the second position, the switching head 511 of the switching member 51 is pressed by one hand to drive the rotating rod 4 to move along the axis L in a direction away from the first clamping arm 22, so that one of the positioning members 52 is separated from the main positioning hole 223 of the first clamping arm 22, and the elastic pushing member 53 accumulates the potential energy, and then the rotating rod 4 is rotated to the position where the insertion end 412 is adjacent to the clamping member 25 of the clamping body 2 by the other hand, so that the potential energy of the elastic pushing member 53 is released by removing the force applied by the hand, the rotating rod 4 is moved along the axis L to be close to the first clamping arm 22, and the penetrating segments 523 of the other positioning member 52 are respectively penetrating the other sub-positioning hole 413 and the main positioning hole 223, so that the rotating rod 4 is positioned in the second position. Therefore, the second embodiment has the same purpose and effect as the first embodiment.

[0058] Referring to Figures 16 to 19 , the third embodiment of the clamping forceps is basically the same as the first embodiment, and the difference is that:

[0059] The switching member 51' has a holding head 516 for holding, and the switching rod body 512 extends along the axis L from the holding head 516. The first clamping arm 22 is located between the holding head 516 and the rotating rod 4 in the direction of the axis L. The connecting hole 414' of the rotating rod 4 is a non-circular hole, and the outer contour of the connecting segment 514' of the switching member 51 is also non-circular.

[0060] Referring to Figure 18 , Figures 20 to 22, the connecting section 514' of the switch member 51' can pass through the connecting hole 414' of the rotating rod 4 and drive the rotating rod 4 to rotate around the axis L. Therefore, the third embodiment can be held by the holding head 516 of the switch member 51' with one hand, and the rotating rod 4 can be moved along the axis L away from the first clamping arm 22 to make the positioning member 52 disengage from the auxiliary positioning hole 413 of the rotating rod 4, and make the elastic pushing member 53 accumulate the potential energy. Then, the rotating rod 4 can be rotated to the clamping member 42 or the inserting rod end 412 adjacent to the clamping part 25 of the clamp body 2 by rotating the switch member 51' with the same hand. The hand force can be released to make the elastic pushing member 53 release the potential energy, and the rotating rod 4 can be positioned at the first position or the second position. The connecting hole 414' of the rotating rod 4 is a non-circular hole, and the outer contour of the connecting section 514' of the switch member 51' is non-circular. The rotating rod 4 can be switched between the first position and the second position by one hand operation. In addition to the same purpose and effect as the first embodiment, the operation convenience can be improved.

[0061] The above is only an embodiment of the present application, and cannot limit the scope of the present application. Any simple equivalent changes and modifications made according to the claims and description of the present application are still within the scope of the present application.

Claims

1. A clamp, characterized by: Comprising: a clamp body including a first clamp arm, a second clamp arm swingable relative to the first clamp arm, and a clamp seat provided on the second clamp arm; a rotating rod movably provided on the first clamp arm and including a rod body and a clamping member, the rod body being rotatably provided on the first clamp arm with an axis as a center and being movable along the axis relative to the first clamp arm, the rod body having a clamping end and a rod inserting end oppositely arranged, the clamping member being provided on the clamping end, the rotating rod being rotatable relative to the first clamp arm between a first position and a second position, the clamping member of the rotating rod being adjacent to the clamp seat of the clamp body when the rotating rod is in the first position, the rod inserting end of the rotating rod being adjacent to the clamp seat of the clamp body when the rotating rod is in the second position; and a switching unit including a switching member and at least one positioning member, the switching member being provided on the first clamp arm along the axis and being connected to the rotating rod and used to drive the rotating rod to move along the axis relative to the first clamp arm, the positioning member being used to pass through the first clamp arm and the rotating rod along the direction of the axis and to position the rotating rod at the first position and the second position.

2. The tongs of claim 1, wherein: The switching member has a switching head portion located on two opposite sides of the first clamp arm along the direction of the axis and the rotating rod, respectively, and a switching rod body extending along the direction of the axis from the switching head portion and passing through the first clamp arm and the rotating rod, the switching unit further includes a spring pushing member compressively sleeved on the switching rod body and elastically abutting on the first clamp arm and the switching head portion at two ends, respectively, the spring pushing member has potential energy that always drives the switching head portion away from the first clamp arm and drives the rotating rod to approach the first clamp arm along the direction of the axis.

3. The tongs of claim 1, wherein: The switching member has a pivoting segment passing through the first clamp arm, a connecting segment passing through the rotating rod and having an outer diameter smaller than that of the pivoting segment, and a shoulder portion located between the pivoting segment and the connecting segment and abutting on the rotating rod.

4. The tongs of claim 1, wherein: The first clamp arm has a pivoting hole extending along the axis, the rotating rod has a connecting hole extending along the axis and communicating with the pivoting hole, the switching member has a pivoting segment passing through the pivoting hole and a connecting segment passing through the connecting hole, an outer contour of the connecting segment of the switching member is circular, the connecting hole of the rotating rod is a circular hole, and the rotating rod is rotatable relative to the switching member with the axis as a center.

5. The tongs of claim 1, wherein: The first clamp arm has a pivoting hole extending along the axis, the rotating rod has a connecting hole extending along the axis and communicating with the pivoting hole, the switching member has a pivoting segment passing through the pivoting hole and a connecting segment passing through the connecting hole, an outer contour of the connecting segment of the switching member is non-circular, the connecting hole of the rotating rod is a non-circular hole, and the switching member can drive the rotating rod to rotate with the axis as a center.

6. The tongs of claim 5, wherein: The switching member has a holding head for holding, and a switching shaft body extending from the holding head along the axis and having the pivot segment and the connecting segment, the first clamping arm being located between the holding head and the rotating shaft in the direction of the axis.

7. The tongs of claim 1, wherein: The first clamping arm has a main positioning hole extending in the direction of the axis, the shaft body of the rotating shaft has two spaced-apart and extending in the direction of the axis secondary positioning holes, the positioning member has two penetrating segments respectively penetrating the first clamping arm and the rotating shaft, the penetrating segments of the positioning member respectively penetrating the main positioning hole of the first clamping arm and one of the secondary positioning holes when the rotating shaft is in the first position, and the penetrating segments of the positioning member respectively penetrating the main positioning hole of the first clamping arm and the other secondary positioning hole when the rotating shaft is in the second position.

8. The tongs of claim 7, wherein: The number of the positioning members of the switching unit is two, one of the penetrating segments of one of the positioning members respectively penetrating one of the secondary positioning holes and the main positioning hole of the first clamping arm when the rotating shaft is in the first position, one of the penetrating segments of the other positioning member penetrating the other secondary positioning hole and the other penetrating segment being exposed, one of the penetrating segments of one of the positioning members respectively penetrating one of the secondary positioning holes and the main positioning hole of the first clamping arm when the rotating shaft is in the second position, and the other penetrating segment being exposed, and the penetrating segments of the other positioning member respectively penetrating the other secondary positioning hole and the main positioning hole of the first clamping arm.

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