CN217345588U - Cutting tool - Google Patents

Abstract

The application provides a cutting tool, including portion of gripping and cutting portion, wherein, still include the feed part, the feed part is connected with the cutting portion, and the feed part is connected with the portion of gripping, and the feed part is configured to under the drive of external force, can realize quick feed for wait to cut the material and all contact with the cutting edge with the fixed part of cutting portion. The application provides a cutting tool can realize quick feed for wait to cut the material and get into fast and wait to cut the state, and carry out the cutting action, consequently can show improvement cutting efficiency.

Description

Cutting tool

Technical Field

The present application relates to hand tools, and more particularly to a cutting tool.

Background

As a common tool, a cutting tool generally includes a handle and a cutting portion that can be pressed. Wherein the cutting portion comprises a blade for cutting. The cutting part has a certain opening angle for accommodating materials such as a pipe to be cut. The user reduces the opening angle of the cutting part by pressing the handle to realize the cutting action of the material to be cut.

In order to increase the cutting force in the prior art, the blade is designed to be of a ratchet type. For example, a ratchet type pipe cutter is used to cut PVC pipe. The operation of the pipe cutter is characterized in that the ratchet type blade is rotated by a ratchet tooth included angle by pressing the handle, and the ratchet type blade is prevented from reversely rotating by the stopping component. Each time the handle is pressed, the ratchet type blade can rotate by a ratchet tooth included angle, the opening angle or the interval of the cutting part is gradually reduced, and finally, part or all of the cutting part is closed to finish the cutting action.

However, there is a problem in the prior art in that, since the size of the material to be cut cannot be predicted in advance, the opening angle or the opening interval of both ends of the cutting part is generally set large in order to be suitable for more sizes of the material to be cut. And the handle is pressed each time only to reduce a small amount of opening angle or interval, usually a ratchet type tooth included angle, so that the feed speed is slow, and the material to be cut can be contacted with both ends of the cutting part and enter a state to be cut only by pressing for many times. The cutting operation is not actually performed until the material to be cut enters the state to be cut, thereby causing cutting inefficiency.

Those skilled in the art are motivated to develop a cutting tool that can feed quickly to increase the feed speed of the ratchet blade and increase cutting efficiency.

SUMMERY OF THE UTILITY MODEL

One aspect of the present application provides a cutting tool, including a holding portion and a cutting portion, wherein, further including a feeding component, the feeding component is connected with the cutting portion, the feeding component is configured to enable a material to be cut to enter a state to be cut under the driving of an external force.

Optionally, the cutting portion includes a first portion and a second portion, and the first portion is configured to rotate under the driving of an external force and can be relatively closed or separated from the second portion.

Optionally, the feed member is connected to the first portion for driving the first portion.

Optionally, the first portion comprises a ratchet-type blade configured to rotate about a first axis of rotation, the feed member being configured to rotate the ratchet-type blade more than 2 ratchet tooth angles.

Optionally, the feeding component includes a first pin, and the first pin is connected to the cutting portion to realize connection between the feeding component and the cutting portion.

Optionally, the second portion includes a guide rail for receiving the first pin and limiting a direction of movement of the first pin.

Optionally, the guide rail is arc-shaped and is circumferentially arranged around the first rotating shaft.

Optionally, the second portion comprises a shell portion and the rail comprises a hollowed-out portion disposed on the shell portion.

Optionally, the feed member includes a protruding ring that divides the first pin into a first section and a second section.

Optionally, the collar is configured to constrain the first section to an interior of the shell portion.

Optionally, the ratchet type blade comprises a first contact portion, and the first pin is used for driving the ratchet type blade by contacting with the first contact portion and applying pressure.

Optionally, the gripping portion comprises a first gripping portion, and the feeding member is slidably connected with the first gripping portion.

Optionally, the feed member comprises a connecting rod, a first end of which is provided with a first connecting hole.

Optionally, the feed component includes a second pin, and a second end of the connecting rod is provided with a second connecting hole for accommodating the second pin.

Optionally, the second pin is connected to the first holding portion to connect the feeding member to the first holding portion.

Optionally, the first holding portion includes a sliding groove for accommodating the second pin, and the second pin is configured to be slidable in the sliding groove to realize slidable connection between the feeding member and the first holding portion.

Optionally, the connecting rod comprises a connecting portion for connecting the second end with the first end.

Optionally, the connecting portion is a slope, so that the second end and the first end are not in the same plane.

Optionally, the second end is disposed parallel to the first end.

Optionally, the ratcheting blade includes an escape.

Optionally, the avoiding portion comprises a circumferentially arranged circular arc opening.

Optionally, the cutting portion comprises a ratchet blade; the holding part comprises a first holding part provided with a sliding groove; the feeding component comprises a connecting rod, and a first connecting hole is formed in the first end of the connecting rod and used for accommodating a first pin shaft; a second connecting hole is formed in the second end of the connecting rod and used for accommodating a second pin shaft; the second pin shaft is connected with the sliding groove so as to realize slidable connection between the connecting rod and the first holding part; the ratchet type blade comprises a circular arc opening which is circumferentially arranged and used for avoiding the first pin shaft; the connecting rod comprises an inclined plane-shaped connecting part for connecting the first end and the second end.

The utility model has the advantages of this application lies in, the feed part can make the angle of opening of cutting part reduce to exceed 2 times ratchet tooth contained angles under the drive of external force to realize quick feed. Specifically, the specific size of the feed angle is determined by the stroke size of the feed member. The cutting part of the cutting tool can enable the material to be cut to enter the state to be cut more quickly, and therefore cutting efficiency is greatly improved.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present application;

FIG. 2 is a schematic diagram of the working principle of an embodiment of the present application;

FIG. 3 is a schematic view of a ratchet blade according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a first pin configuration according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an embodiment of the present application;

FIG. 7 is a schematic diagram of the working principle of an embodiment of the present application;

FIG. 8 is a schematic structural view of a connecting rod in an embodiment of the present application;

FIG. 9 is a schematic view of the connection structure of the connecting rod and the grip portion according to an embodiment of the present application;

FIG. 10 is a schematic illustration of the working state of an embodiment of the present application;

FIG. 11 is a schematic view of the working state of an embodiment of the present application;

FIG. 12 is a schematic view of the working state of an embodiment of the present application;

FIG. 13 is a schematic view of the working state of an embodiment of the present application;

FIG. 14 is a schematic view of the working state of an embodiment of the present application;

FIG. 15 is a schematic view of the working state of an embodiment of the present application;

FIG. 16 is a schematic diagram of the operation of one embodiment of the present application.

The components in the figure are identified as follows:

1-cutting part, 11-ratchet type blade, 111-first contact part, 12-ratchet teeth, 13-first shaft hole, 14-blade, 15-avoiding part, 17-fixing part, 171-shell part, 172-guide rail, 2-holding part, 21-first holding part, 22-second holding part, 23-chute, 3-feeding part, 31-connecting rod, 311-second end, 312-first end, 313-second connecting hole, 314-first connecting hole, 315-connecting part, 32-second pin shaft, 33-first pin shaft, 34-convex ring, 35-first section, 36-second section and 4-material to be cut.

Detailed Description

The preferred embodiments of the present application will be described in full hereinafter with reference to the accompanying drawings, making the technical contents thereof clearer and easier to understand. The present application is capable of embodiments in many different forms and is not intended to be limited to the embodiments shown herein.

In the drawings, elements having the same structure are denoted by the same reference numerals, and elements having similar structure or function are denoted by the same reference numerals throughout. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the size and thickness of each component are not limited in the present application. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Directional phrases used in this application, such as, for example, upper, lower, front, rear, left, right, inner, outer, side, top, bottom, end, and the like, are used in the drawings to describe and illustrate the present application and are not intended to limit the scope of the present application.

When certain components are described as being "on" another component, the components can be directly on the other component; there may also be an intermediate member disposed on the intermediate member and the intermediate member disposed on the other member. When an element is referred to as being "mounted to" or "connected to" another element, they may be directly "mounted to" or "connected to" the other element or indirectly "mounted to" or "connected to" the other element through an intermediate element.

Example 1

Fig. 1 shows a cutting tool provided in this embodiment. Comprises a cutting part 1, a holding part 2 and a cutter feeding part 3. The feeding member 3 is connected to the cutting section 1. The cutting part 1 has a certain opening angle for receiving the material to be cut. When the material to be cut is arranged inside the cutting part 1, the cutting part 1 is partially or completely closed to achieve the cutting action. Specifically, the cutting portion 1 includes a fixing portion 17 and a ratchet blade 11 (shown in fig. 3), wherein the ratchet blade 11 includes a blade edge 14. The fixed portion 17 is configured to be fixed and the ratchet blade 11 is configured to be rotatable about a first axis of rotation D (shown in fig. 2). The space between the fixing portion 17 (as the second portion) and the cutting edge 14 (as the first portion) forms the opening angle a (shown in fig. 2) of the cutting portion 1 for receiving the material to be cut (not shown in the figures). When the ratchet blade 11 is rotated by an external force, the angle between the fixed portion 17 and the cutting edge 14 increases or decreases. This angle decreases when the cutting section 1 performs a cutting action. When the tubular material to be cut is simultaneously brought into contact with the fixing portion 17 and the cutting edge 14, the material to be cut is brought into a state to be cut.

As shown in fig. 1 and 2, in the present embodiment, preferably, the feeding member 3 includes a first pin 33, and the first pin 33 is detachably connected to the ratchet type blade 11 to connect the feeding member 3 to the cutting part 1. Specifically, the ratchet blade 11 includes a first contact portion 111, and when the first pin 33 contacts the first contact portion 111 and applies pressure to the first contact portion 111, the ratchet blade 11 may be driven to rotate and perform a feeding action. The securing portion 17 includes a shell portion 171, wherein the space of the shell portion 171 proximate the ratchet blade 11 is "interior" of the shell portion 171. The housing 171 is provided with a cutout portion in the shape of an arc as a guide rail 172. The guide rail 172 is used for accommodating the first pin 33 and limiting the moving direction of the first pin 33. The guide rail 172 is circumferentially disposed about the first rotational axis D.

The working principle of this embodiment is shown in fig. 2. The user pulls the first pin 33 along the direction indicated by the arrow B in the figure by pulling or other external force, so that the first pin 33 performs a circumferential movement around the first rotation axis D due to the limitation of the guide rail 172. When the first pin 33 contacts the first contact portion 111 of the ratchet type blade 11 and the first contact portion 111 exerts a force on the ratchet type blade 11 that does not pass through the first rotation axis D, the ratchet type blade 11 can be rotated in a direction (a direction indicated by an arrow C in fig. 2) in which the cutting portion 1 is closed. That is, the cutter feeding member 3 is configured to reduce the opening angle a of the cutting part 1 (i.e., the included angle between the fixing part 17 and the blade 14) driven by an external force.

Fig. 3 shows a schematic view of the ratchet type blade 11 used in this embodiment. The ratchet blade 11 includes a cutting edge 14, ratchet teeth 12, and relief 15. The ratchet teeth 12 are evenly circumferentially distributed teeth, and the spacing between each ratchet tooth 12 is the same. The corresponding angle b between adjacent ratchet teeth 12 is also the same. In the prior art, a moving pawl is typically used to shift the ratchet teeth 12. Each time the grip portion 2 is pressed, the movable jaw moves the ratchet blade 11 by one ratchet tooth 12. Accordingly, the blade 14 is rotated by an angle b relative to the axis of rotation. The opening angle of the cutting part 1 will change from a to a-b. After the holding part 2 is pressed next time, the opening angle of the cutting part 1 is changed into a-2b … …, and the like to realize the feed action. The escape portion 15 is an arc-shaped opening circumferentially arranged around the rotating shaft, and can prevent the first pin 33 from interfering with the ratchet type blade 11 during the feeding process. In practical application scenarios, the opening angle of the cutting part 1 is preset to be larger in order to adapt to more materials to be cut. It may happen that the grip 2 is pressed several times without the material to be cut being brought into contact with the holding portion 17 and the cutting edge 14 at the same time, i.e. without the material to be cut having entered the state to be cut. In fact, the cutting operation can only be really started after the material to be cut enters the state to be cut, so the cutting efficiency in the prior art is very low. By adopting the arrangement of the embodiment, the ratchet type blade 11 can rotate by more than or equal to 2 times of the included angle b of the ratchet teeth 12 by dialing the feeding component 3, the specific rotating angle of the ratchet type blade 11 driven by the feeding component 3 is determined by the stroke of the feeding component 3, and the feeding action can be rapidly carried out and the material to be cut can enter the state to be cut.

Fig. 4 is a schematic structural diagram of the first pin 33 in this embodiment. The first pin 33 includes a protruding ring 34, and the protruding ring 34 is disposed around the first pin 33 and divides the first pin 33 into a first section 35 and a second section 36. The size of the male ring 34 is slightly larger than the rail 172 for preventing the first pin 33 from falling out of the shell portion 171, so that the first section 35 of the first pin 33 is confined inside the shell portion 171, and preferably, the length of the first section 35 is the same as the thickness of the ratchet blade 11.

Example 2

Fig. 5 and 6 show a cutting tool according to this embodiment. Comprises a cutting part 1, a holding part 2 and a cutter feeding part 3. One end of the cutter feeding member 3 is connected to the cutting part 1, and the other end of the cutter feeding member 3 is connected to the grip part 2. The cutting part 1 has a certain opening angle for receiving the material to be cut (not shown in the figures). When the material to be cut is arranged inside the cutting section 1, the cutting section 1 is partially or completely closed, realizing the cutting action. In the present embodiment, the feed member 3 is preferably driven by the grip 2 so that the cutting section 1 is closed, so that the material to be cut is quickly brought into the state to be cut and is ready to start a cutting action.

In the present embodiment, the cutting part 1 preferably includes a ratchet type blade 11, and the ratchet type blade 11 includes a first contact part 111. The grip 2 includes a first grip 21 and a second grip 22. The feeding member 3 includes a connecting rod 31, a second pin 32, and a first pin 33. The connecting rod 31 is slidably connected to the first grip portion 21 by a second pin 32, and the connecting rod 31 is connected to the ratchet blade 11 by a first pin 33. The connecting rod 31 drives the ratchet blade 11 to rotate by driving the first pin 33.

The working principle of this embodiment is shown in fig. 7. The user presses the grip portion 2 so that the first grip portion 21 moves toward the second grip portion 22 (in the direction indicated by the arrow a in fig. 7). Due to the connection of the second pin 32 with the first holding portion 21, the connecting rod 31 moves along the length direction (the direction indicated by arrow B in fig. 7) and drives the first pin 33 to move along the direction indicated by arrow B under the driving of the first holding portion 21. When the first pin 33 contacts and presses the first contact portion 111, a force is applied to the ratchet blade 11 that does not pass through the first rotation axis D (shown in fig. 2), so that the ratchet blade 11 rotates in a direction in which the cutting portion 1 is closed (a direction shown by an arrow C in fig. 7). That is, the feeding member 3 is configured to reduce the opening angle a of the cutting part 1 (i.e., the included angle between the fixing part 17 and the blade 14) when the grip part 2 is driven. The structure of the ratchet blade 11 employed in this embodiment is the same as that employed in embodiment 1 (as shown in fig. 3). In the present embodiment, the connecting rod 31 can rotate the ratchet blade 11 by an included angle b equal to or greater than 2 times of the ratchet teeth 12 with a single pressing of the grip portion 2 under the driving of the first grip portion 21. The particular angle of rotation of the ratchet blade 11 is determined by the stroke of the connecting rod 31. More preferably, the present embodiment can bring the material to be cut into the state to be cut by simultaneously contacting the holding portion 17 and the blade 14 after pressing the grip portion 2 once.

Fig. 8 shows a connecting rod 31 used in the present embodiment. The connecting rod 31 includes a second end 311 at which a second connecting hole 313 is provided, and a first end 312 at which a first connecting hole 314 is provided. The second connecting hole 313 is used for accommodating the second pin 32 to connect with the first holding portion 21. The first coupling hole 314 is adapted to receive the first pin 33 for coupling with the ratchet blade 11. The second end 311 is connected to the first end 312 by a connecting portion 315. In the embodiment, the connecting portion 315 is a slope, so that the second end 311 is parallel to the first end 312, but not in the same plane, so as to avoid other components in the first holding portion 21, and reduce the volume of the cutting tool.

Fig. 9 shows a structure of a connection part of the connection rod 31 and the first grip portion 21 in the present embodiment. In the present embodiment, it is preferable that a chute 23 is provided on one wall of the first grip portion 21. The sliding slot 23 is used for accommodating a second pin 32 arranged in a second connecting hole 313 of the connecting rod 31 to realize the slidable connection of the connecting rod 31 and the first holding part 21. When the second pin shaft 32 is at different positions in the slide groove 23, the stroke of the connecting rod 31 for driving the ratchet type blade 11 is different when the holding part 2 is pressed once, so that the cutting tool is suitable for materials to be cut with different sizes.

Fig. 10-16 are schematic views of the operation of this embodiment in preparation for cutting different sizes of material 4 to be cut.

As shown in fig. 10, when the size (e.g., diameter) of the material 4 to be cut is sufficiently large. When the material to be cut 4 is accommodated inside the cutting part 1, the material to be cut 4 is simultaneously in contact with the fixing part 17 and the blade 14, thereby having been in a state to be cut. When the user presses the grip portion 2 (for example, in the direction of the arrow a in fig. 7), the first pin 33 is driven by the connecting rod 31 to move circumferentially along the escape portion 15, and the first pin 33 is brought into contact with the first contact portion 111. Although the first pin 33 is capable of producing a tendency of rotation of the ratchet blade 11 by applying pressure to the first contact portion 111, this pressure is not sufficient to cause actual rotation of the ratchet blade 11 due to the presence of the material 4 to be cut. The material 4 to be cut is thus in the state to be cut. At this time, the ratchet type blade 11 is driven by a movable claw (not shown) to perform a cutting operation on the material to be cut.

As shown in fig. 11, in more scenarios, the size of the material 4 to be cut is slightly smaller than the opening size of the cutting part 1 (if the size of the material 4 to be cut is larger than the opening size of the cutting part 1, it cannot be accommodated in the cutting part 1). When the material 4 to be cut is in contact with the fixing portion 17, it cannot be in contact with the cutting edge 14 at the same time, and thus is not yet in a state to be cut. In the prior art, since the feeding operation can be performed only by the movable jaw, the ratchet blade 11 can be rotated by the angle b (as shown in fig. 3) only once the movable jaw is driven (the grip portion 2 is pressed). In order to bring the material to be cut 4 into the state to be cut, the grip 2 needs to be pressed a plurality of times. Cutting is therefore time consuming and inefficient. As in the present embodiment, when the user presses the grip portion 2, the connecting rod 31 connected to the grip portion 2 drives the first pin 33 to move. When the first pin 33 contacts the first contact portion 111 (as shown in fig. 12), the ratchet blade 11 is pushed to rotate, so as to perform a feeding operation. In this feed operation, the angle of rotation of the ratchet blade 11 is determined by the stroke of the connecting rod 31, not by the movable jaw. Therefore, the user can rotate the ratchet type blade 11 by an angle far larger than the included angle b by pressing the holding part 2 once, and the fast feed is realized. When the cutting edge 14 contacts the material 4 to be cut (as shown in fig. 13), the feeding motion is completed and the material 4 to be cut is in a state to be cut. The user can now release the grip 2. Although the first pin 33 is moved in the opposite direction to the first contact portion 111 by the connecting rod 31, the first pin 33 can move in the escape portion 15 due to the escape portion 15 without rotating the ratchet blade 11 in the opposite direction, and a stopper (not shown) is provided to prevent the ratchet blade 11 from rotating in the opposite direction in this embodiment. The user can perform the cutting operation by pressing the grip portion 2 again. The user just has realized quick feed through once pressing the portion 2 of gripping through this embodiment for take cutting material 4 to get into and take the cutting state, improve cutting efficiency by a wide margin.

As shown in fig. 14, in some scenarios, the size of the material 4 to be cut is smaller. If the solution in the prior art is adopted, the holding part 2 needs to be pressed more times to make the material to be cut 4 enter the state to be cut. In the present embodiment, when the user presses the grip 2, the connecting rod 31 connected to the grip 2 drives the first pin 33 to move. When the first pin 33 contacts the first contact portion 111, the ratchet blade 11 is pushed to rotate, thereby realizing the feeding operation. It may happen that, when the connecting rod 31 reaches the maximum stroke, the ratchet-type blade 11 has not yet come into contact with the material to be cut 4, i.e. the material to be cut 4 has not yet been in the state to be cut, as shown in fig. 15. At this point the user may reposition the grip 2 as shown in figure 16. Although the first pin 33 is moved away from the first contact portion 111 by the connecting rod 31, the first pin 33 does not rotate the ratchet blade 11 due to the escape portion 15. While a pawl (not shown) will prevent the ratchet blade 11 from rotating. After the grip portion 2 is reset, the user can press the grip portion 2 again, and continue the feeding operation by the movable claw until the material to be cut 4 enters the state to be cut. Although in this scenario, the user fails to bring the material to be cut 4 into the state to be cut upon pressing the grip 2 once, the feed speed is obviously increased, and the cutting efficiency is improved.

The foregoing detailed description of the preferred embodiments of the present application. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the concepts of the present application should be within the scope of protection defined by the claims.

Claims (22)

1. A cutting tool comprises a holding part and a cutting part, wherein the cutting tool further comprises a cutter feeding part, the cutter feeding part is connected with the cutting part, and the cutter feeding part is configured to enable a material to be cut to enter a state to be cut under the driving of external force.

2. The cutting tool of claim 1, wherein the cutting portion comprises a first portion and a second portion, the first portion configured to rotate under external force and being relatively closable or separable from the second portion.

3. The cutting tool of claim 2, wherein the feed member is coupled to the first portion for driving the first portion.

4. The cutting tool of claim 3, wherein the first portion comprises a ratchet blade configured to rotate about a first axis of rotation, the feed member configured to rotate the ratchet blade more than 2 times the ratchet tooth angle.

5. The cutting tool of claim 4, wherein the feed member includes a first pin that is coupled to the cutting portion to effect coupling of the feed member to the cutting portion.

6. The cutting tool of claim 5, wherein the second portion includes a guide rail for receiving the first pin and limiting a direction of movement of the first pin.

7. The cutting tool of claim 6, wherein the guide track is arcuate and is disposed circumferentially about the first axis of rotation.

8. The cutting tool of claim 7, wherein the second portion includes a shell portion and the rail includes a hollowed out portion disposed on the shell portion.

9. The cutting tool of claim 8, wherein the feed member comprises a raised ring that divides the first pin into a first segment and a second segment.

10. The cutting tool of claim 9, wherein the raised ring is configured to constrain the first segment to an interior of the shell portion.

11. The cutting tool of claim 5, wherein the ratchet blade includes a first contact portion, the first pin effecting drive to the ratchet blade by contacting and applying pressure to the first contact portion.

12. The cutting tool of claim 1, wherein the gripping portion comprises a first gripping portion, the feed member being slidably coupled to the first gripping portion.

13. The cutting tool of claim 12, wherein the feed member comprises a connecting rod, a first end of the connecting rod being provided with a first connection hole.

14. The cutting tool of claim 13, wherein the feed member includes a second pin, and the second end of the connecting rod is provided with a second connecting hole for receiving the second pin.

15. The cutting tool of claim 14, wherein the second pin is coupled to the first grip to effect coupling of the feed member to the first grip.

16. The cutting tool of claim 15, wherein the first grip portion includes a slide slot for receiving the second pin, the second pin configured to be slidable within the slide slot to enable slidable connection of the feed member with the first grip portion.

17. The cutting tool of claim 14, wherein the connecting rod includes a connecting portion for connecting the second end with the first end.

18. The cutting tool of claim 17, wherein the connecting portion is beveled such that the second end is not coplanar with the first end.

19. The cutting tool of claim 18, wherein the second end is disposed parallel to the first end.

20. The cutting tool of claim 4, wherein the ratchet blade includes an escape.

21. The cutting tool of claim 20, wherein the relief comprises a circumferentially disposed circular arc shaped opening.

22. The cutting tool of claim 1, wherein the cutting portion comprises a ratchet blade; the holding part comprises a first holding part provided with a sliding groove; the feeding component comprises a connecting rod, and a first connecting hole is formed in the first end of the connecting rod and used for accommodating a first pin shaft; a second connecting hole is formed in the second end of the connecting rod and used for accommodating a second pin shaft; the second pin shaft is connected with the sliding groove so as to realize slidable connection between the connecting rod and the first holding part; the ratchet type blade comprises a circular arc opening which is circumferentially arranged and used for avoiding the first pin shaft; the connecting rod comprises an inclined plane-shaped connecting part for connecting the first end and the second end.

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