A cutting knife for cable protection sleeves

Abstract

The utility model provides a kind of cutting knife of cable protection sleeve, it includes handle, tool bit, ratchet wheel and pawl, the tool bit rotationally connects the handle, its cutting edge is towards the handle;The ratchet wheel is movably sleeved on the ratchet wheel shaft in the handle;The pawl is engaged with the ratchet wheel, for when pressing down the handle, limit the relative rotation of the ratchet wheel and the ratchet wheel shaft occurs.The cutting knife provided by the utility model is suitable for the cutting operation of cable protection sleeve of different thickness by different cutting operation mode, can reduce the type and quantity of tools carried by worker, reduce load;And compared with wallpaper knife, the positioning part in the present cutting knife can protect insulated electrical conductor, avoid cutting part to produce direct incision to the insulated electrical conductor inside cable protection sleeve, improve cutting quality.

Description

Technical Field

[0001] This utility model relates to the technical field of cable protection sleeve cutting equipment, and in particular to a cutting knife for cable protection sleeves. Background Technology

[0002] A cable is a conductive wire consisting of one or more insulated electrical conductors and an outer insulating layer. They are used to transmit electrical energy or signals from one place to another. Cable sheath cutting refers to the operation of cutting the outer insulation layer of a cable during installation or maintenance using appropriate tools or equipment.

[0003] In the existing technology, workers often use wire strippers and utility knives to cut cable protective sheaths. Wire strippers are suitable for cutting the protective sheaths of thin cables, while utility knives are usually used to cut the protective sheaths of extra-thick cables. In order to meet different cutting needs, workers need to carry too many tools. Moreover, when cutting the protective sheaths of extra-thick cables with a utility knife, the cutting speed is slow, the cutting uniformity is poor, and it is easy to damage the internal insulating conductors. Utility Model Content

[0004] The purpose of this invention is to provide a cutting tool for cable protection sleeves, thereby addressing the shortcomings in the aforementioned background technology.

[0005] The technical solution of this utility model is: a cutting blade for cable protection sleeves, comprising:

[0006] Handle;

[0007] A cutting head, which is rotatably connected to the handle, with its blade facing the handle;

[0008] A ratchet, which is movably mounted on a ratchet shaft inside the tool holder;

[0009] A pawl engages with the ratchet wheel and is used to restrict relative rotation between the ratchet wheel and the ratchet wheel shaft when the handle is pressed down.

[0010] Preferably, the blade head includes a connecting portion, a cutting portion, and a positioning portion connected in sequence, the connecting portion connecting the cutting portion and the handle; the blade edge is at least disposed on the cutting portion; the positioning portion has a sharp end facing the handle.

[0011] Preferably, the cutting portion is arc-shaped, with the concave side of the arc facing the handle.

[0012] Preferably, the positioning portion extends radially along the arc, and the sharp end at least partially extends beyond the bottom surface of the cutting portion.

[0013] Preferably, the handle has a mounting cavity with an opening at the bottom, the ratchet shaft is fixed in the mounting cavity, and some of the ratchet teeth extend out of the opening at the bottom of the mounting cavity.

[0014] Preferably, the bottom surface of the ratchet is higher than the bottom surface of the cutter head.

[0015] Preferably, a pawl shaft is provided in the mounting cavity, the pawl is movably sleeved on the pawl shaft, and the pawl and the ratchet can rotate in opposite directions around the pawl shaft and the ratchet shaft, respectively.

[0016] Preferably, a return spring is provided inside the mounting cavity, and the two ends of the return spring are respectively connected to the inner wall of the mounting cavity and the pawl, for driving the pawl to return to its original position and engage the ratchet.

[0017] The beneficial effects of this technical solution include: this cutting knife is suitable for cutting cable protective sheaths of different thicknesses through different cutting operation methods, which can reduce the types and number of tools carried by workers and reduce the load; and compared with utility knives, the positioning part in this cutting knife can protect the insulating conductor and avoid the cutting part from directly cutting the insulating conductor inside the cable protective sheath, thereby improving the cutting quality. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a usage state diagram of an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the connection between the blade head and the handle in an embodiment of this utility model.

[0021] In the picture:

[0022] 1. Blade head; 11. Handle; 12. Cutting section; 13. Positioning section;

[0023] 2. Handle; 21. Mounting cavity;

[0024] 3. Ratchet;

[0025] 4. Claws;

[0026] 5. Ratchet shaft;

[0027] 6. Pawl shaft;

[0028] 7. Return spring;

[0029] 8. Tool holder shaft;

[0030] 9. Cable; 91. Cable protective sleeve; 92. Insulated electrical conductor. Detailed Implementation

[0031] The technical solutions of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] In the description of the embodiments of this utility model, it should be understood that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise expressly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.

[0033] Reference Appendix Figure 1-3 This embodiment provides a cable protection sleeve cutting knife, which includes: a cutting head 1, a cutting handle 2, a ratchet 3, and a pawl 4.

[0034] The cutter head 1 includes a connecting part 11, a cutting part 12, and a positioning part 13. At least the cutting part 12 has a blade, and the blade on the cutting part 12 faces the handle 2. The connecting part 11 and the positioning part 13 are located at the top and bottom ends of the cutting part 12, respectively. The end of the connecting part 11 away from the cutting part 12 is rotatably connected to the handle 2 through the handle shaft 8. The cutting part 12 is arc-shaped, with the concave side of the arc facing the handle 2. The positioning part 13 extends radially along the arc and has a sharp end facing the handle 2 to reduce cutting resistance. The sharp end at least partially extends beyond the bottom surface of the cutting part 12. The bottom surface of the positioning part 13 is flat and can abut against the outer wall of the insulated conductor 92 inside the cable protection sleeve 91 to prevent the blade of the cutting part 12 from directly cutting the insulated conductor 92.

[0035] The end of the handle 2 near the cutter head 1 is provided with a mounting cavity 21. The bottom end of the mounting cavity 21 is open. A ratchet shaft 5 and a pawl shaft 6 are fixedly installed in the mounting cavity 21. The ratchet 3 is movably sleeved on the ratchet shaft 5, and the pawl 4 is movably sleeved on the pawl shaft 6. The two can rotate in opposite directions around the ratchet shaft 5 and the pawl shaft 6, respectively. The end of the pawl 4 away from the pawl shaft 6 is engaged with the teeth on the ratchet 3, which can restrict the movement direction of the ratchet 3 so that it can only rotate in one direction when it rotates around the ratchet shaft 5.

[0036] Specifically, refer to the appendix of this embodiment. Figure 2From the perspective of the ratchet, restricted by the pawl 4, the ratchet 3 can only rotate clockwise around the ratchet shaft 5. However, due to the pressure of the ratchet 3, the pawl 4 can rotate counterclockwise around the pawl shaft 6 and temporarily disengage from the recessed part of the teeth on the ratchet 3 (but not from the outermost end of the teeth).

[0037] More specifically, some of the teeth of the ratchet 3 extend beyond the bottom opening of the mounting cavity 21. The portion of the ratchet 3 extending out of the mounting cavity 21 is used to contact the cable protection sleeve 91, providing a fulcrum for the use of this cutting blade. A return spring 7 is configured between the pawl 4 and the ratchet 3. The two ends of the return spring 7 are respectively connected to the inner wall of the mounting cavity 21 and the pawl 4, which are used to drive the pawl 4 to return to the recess of the teeth on the ratchet 3, so that it engages and locks the ratchet 3.

[0038] To successfully cut the cable protective sleeve 91, the diameter of the ratchet 3 should be optimized as follows: control the diameter of the ratchet 3 so that the bottom surface of the ratchet 3 is higher than the bottom surface of the cutter head 1.

[0039] Reference Appendix Figure 2 From the perspective of the cutting part 12, the connecting part 11 is located at the top of the cutting part 12. The left end of the connecting part 11 is connected to the cutting part 12, and the right end is connected to the handle 2 through the handle shaft 8. The cutting part 12 is arc-shaped, and the blade is located on the cutting part 12. Both the arc shape and the blade of the cutting part 12 are facing to the right. The positioning part 13 is located at the bottom of the cutting part 12. In the top view projection, the positioning part 13 has a configuration that gradually narrows from left to right to form a sharp end. Part of the sharp end extends beyond the bottom surface of the cutting part 12.

[0040] Reference Appendix Figure 2 From this perspective, when using the aforementioned cutting blade to cut the cable protective sleeve 91, first, the blade head 1 is positioned on the left end face of the cable 9, causing the sharp end of the positioning part 13 to penetrate into the cable protective sleeve 91; the right end of the handle 2 is lifted upwards, causing the left end of the handle 2 to rotate counterclockwise around the handle shaft 8. At this time, the handle 2 and the axis of the cable 9 have a certain angle. Then, the bottom end of the ratchet 3 is pressed against the outer surface of the cable protective sleeve 91, and the handle 2 is pulled horizontally to the right. If the cutting blade can be pulled smoothly and cut the cable protective sleeve 91, the handle 2 is continued to be pulled horizontally to the right, so that the blade edge of the blade head 1 cuts the cable protective sleeve 91. If the cutting blade cannot be pulled smoothly, i.e., the cutting... If the cutting resistance is too high, press down on the right end of the handle 2, causing the left end of the handle 2 to rotate clockwise around the handle shaft 8. At this time, because the bottom end of the ratchet 3 is pressed against the outer surface of the cable protection sleeve 91 and the pawl 4 has a limiting effect on the ratchet 3, the ratchet 3 cannot rotate relative to the ratchet shaft 5, that is, the ratchet 3 cannot rotate counterclockwise around the ratchet shaft 5. Then, by pressing down and moving the handle 2 to the right at the same time, the ratchet 3 can rotate clockwise around the handle shaft 8 together with the handle 2. During this process, the contact point between the ratchet 3 and the cable protection sleeve 91 changes, thereby driving the cutter head 1 to move slowly to the right, thus achieving a labor-saving cut on the cable protection sleeve 91.

[0041] To continuously use the "press down and move the handle 2 to the right" method for cutting, each time the handle 2 is pressed down to its limit position, the cutter head 1 will make a short cut to the cable protective sleeve 91. Then, the handle 2 is raised to rotate counterclockwise around the handle axis 8. The upward force is controlled so that the ratchet 3 does not contact the cable protective sleeve 91 during the counterclockwise rotation of the handle 2. After the handle 2 has rotated counterclockwise to its limit position, the height of the ratchet 3 is lowered so that the ratchet 3 abuts against the cable protective sleeve 91. The "press down and move the handle 2 to the right" operation described above is repeated to cut the cable protective sleeve 91.

[0042] The aforementioned "pull the handle to the right 2" is suitable for cutting thinner cable sheaths 91. During this process, the ratchet 3 rotates clockwise around the ratchet shaft 5, reducing the frictional resistance experienced by the cutting blade. The aforementioned "press down and move the handle to the right 2" is suitable for cutting thicker cable sheaths 91. During this process, the ratchet 3 rotates clockwise around the handle shaft 8, thereby pulling the blade head 1 to the right to cut the cable sheath 91. Furthermore, the surface of the positioning part 13 away from the cutting part 12 can abut against the outer wall of the insulating conductor 92 inside the cable sheath 91, preventing the blade edge of the cutting part 12 from contacting the insulating conductor 92 and avoiding direct cuts to the insulating conductor 92.

[0043] Compared with the prior art, the advantages of this utility model include at least the following: the cutting knife provided by this technical solution is suitable for cutting cable protective sleeves 91 of different thicknesses through different cutting operation methods, which can reduce the types and number of tools carried by workers and reduce the load; and compared with a utility knife, the positioning part 13 in this cutting knife can protect the insulated conductor 92 and avoid the cutting part 12 from directly cutting the insulated conductor 92 inside the cable protective sleeve 91, thereby improving the cutting quality.

[0044] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A cutting tool for cable protective sheaths, characterized in that, include: Handle; A cutting head, which is rotatably connected to the handle, with its blade facing the handle; A ratchet, which is movably mounted on a ratchet shaft inside the tool holder; A pawl engages with the ratchet wheel and is used to restrict relative rotation between the ratchet wheel and the ratchet wheel shaft when the handle is pressed down.

2. The cutting blade for cable protective sheaths according to claim 1, characterized in that, The blade head includes a connecting part, a cutting part, and a positioning part connected in sequence. The connecting part connects the cutting part and the handle. The blade edge is at least disposed on the cutting part. The positioning part has a sharp end facing the handle.

3. The cutting blade for cable protective sheaths according to claim 2, characterized in that, The cutting section is arc-shaped, with the concave side of the arc facing the handle.

4. The cable protection sheath cutting blade according to claim 3, characterized in that, The positioning portion extends radially along the arc, and the sharp end at least partially extends beyond the bottom surface of the cutting portion.

5. The cutting blade for cable protective sheaths according to any one of claims 1-4, characterized in that, The handle has a mounting cavity with an opening at the bottom, the ratchet shaft is fixed in the mounting cavity, and some of the ratchet teeth extend out of the bottom opening of the mounting cavity.

6. The cable protection sheath cutting blade according to claim 5, characterized in that, The bottom surface of the ratchet is higher than the bottom surface of the cutter head.

7. The cable protection sheath cutting blade according to claim 6, characterized in that, The mounting cavity contains a pawl shaft, the pawl is movably sleeved on the pawl shaft, and the pawl and the ratchet can rotate in opposite directions around the pawl shaft and the ratchet shaft, respectively.

8. The cable protection sheath cutting blade according to claim 7, characterized in that, A return spring is provided inside the mounting cavity. The two ends of the return spring are respectively connected to the inner wall of the mounting cavity and the pawl, which is used to drive the pawl to return to its original position and engage the ratchet.

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