Cutting knife for cable protection sleeve and using method

Abstract

The invention provides a cutting knife for a cable protection sleeve and a using method, the cutting knife comprises a knife handle, a knife head, a ratchet wheel and a pawl, the knife head is rotatably connected with the knife handle, and the blade point of the knife head faces the knife handle; the ratchet wheel is movably sleeved on the ratchet wheel shaft in the knife handle; the pawl is meshed with the ratchet wheel and used for limiting relative rotation of the ratchet wheel and the ratchet wheel shaft when the knife handle is pressed downwards. The cutting knife provided by the invention is suitable for cutting operation of cable protection sleeves with different thicknesses through different cutting operation modes, the types and the number of tools carried by workers can be reduced, and the load is reduced; and compared with a wallpaper knife, the positioning part in the cutting knife can protect the insulation electric conductor, the cutting part is prevented from directly cutting the insulation electric conductor on the inner side of the cable protection sleeve, and the cutting quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable protective cover cutting equipment, and in particular to a cable protective cover cutting knife and a use method thereof. Background Art

[0002] Cables are conductive wires consisting of one or more insulated conductors surrounded by an insulating layer. They are used to transmit electrical energy or signals from one location to another. Cable sheath cutting refers to the process of removing the insulation layer from a cable using tools or equipment during cable installation or repair.

[0003] In the prior art, workers often use wire strippers and wallpaper cutters to cut cable protective covers. Wire strippers are suitable for cutting protective covers of thin cables, while wallpaper cutters are usually used to cut protective covers of extra-thick cables. To meet different cutting needs, workers need to carry too many tools. Moreover, when using wallpaper cutters to cut extra-thick cable protective covers, the cutting speed is slow, the cutting uniformity is poor, and the internal insulated conductor is easily damaged. Summary of the Invention

[0004] The purpose of the present invention is to provide a cable sheath cutting knife and a method of use, so as to solve the deficiencies in the above-mentioned background technology.

[0005] The technical solution of the present invention is: a cable sheath cutting knife, which comprises:

[0006] knife handle;

[0007] a cutter head, the cutter head being rotatably connected to the cutter handle, with the cutting edge thereof facing the cutter handle;

[0008] A ratchet, the ratchet being movably sleeved on a ratchet shaft in the knife handle;

[0009] A pawl is engaged with the ratchet and is used to limit the relative rotation between the ratchet and the ratchet shaft when the knife handle is pressed down.

[0010] Preferably, the blade head includes a handle portion, a cutting portion and a positioning portion connected in sequence, wherein the handle portion connects the cutting portion and the handle; the blade is at least arranged on the cutting portion; and 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 knife handle.

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

[0013] Preferably, a placement cavity with an opening at the bottom end is provided in the knife handle, the ratchet shaft is fixed in the placement cavity, and some teeth of the ratchet extend out of the bottom end opening of the placement 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 arranged in the accommodating 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 reset spring is arranged in the accommodating cavity, and two ends of the reset spring are respectively connected to the inner wall of the accommodating cavity and the pawl, so as to drive the pawl to reset and engage the ratchet.

[0017] The technical solution of the present invention also includes: a method for using the above-mentioned cable protective cover cutting knife, which includes the steps of:

[0018] Place the cutter head on the long end of the cable so that the blade of the cutter head faces the cable protective sheath to be cut;

[0019] Rotating the knife handle toward the cable protective sleeve to drive the ratchet wheel to approach and abut against the cable protective sleeve;

[0020] The knife handle is moved laterally or rotated toward the cable protective sleeve to drive the knife head to cut the cable protective sleeve.

[0021] The beneficial effects of this technical solution include: the cutting knife is suitable for cutting cable protective covers of different thicknesses through different cutting operation modes, which can reduce the types and number of tools carried by workers and reduce the load; and compared with wallpaper knives, the positioning part in the cutting knife can protect the insulated conductor, avoiding the cutting part from directly cutting the insulated conductor inside the cable protective cover, thereby improving the cutting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall structural diagram of an embodiment of the present invention;

[0023] Figure 2 is a usage state diagram of an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the connection between the cutter head and the handle in an embodiment of the present invention.

[0025] In the picture:

[0026] 1. Blade head; 11. Handle; 12. Cutting part; 13. Positioning part;

[0027] 2. Knife handle; 21. Placement cavity;

[0028] 3. Ratchet;

[0029] 4. Ratchet;

[0030] 5. Ratchet shaft;

[0031] 6. Pawl shaft;

[0032] 7. Return spring;

[0033] 8. Tool handle shaft;

[0034] 9. Cable; 91. Cable sheath; 92. Insulated conductor. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0037] Reference Attachment Figure 1-3 This embodiment provides a cable sheath cutting knife, which includes: a knife head 1, a knife handle 2, a ratchet 3 and a pawl 4.

[0038] The cutter head 1 includes a handle portion 11, a cutting portion 12 and a positioning portion 13. Among the three, at least the cutting portion 12 has a blade, and the blade on the cutting portion 12 faces the handle 2; the handle portion 11 and the positioning portion 13 are respectively located at the top and bottom ends of the cutting portion 12, and the end of the handle portion 11 away from the cutting portion 12 is rotatably connected to the handle 2 through the handle shaft 8. The cutting portion 12 is arc-shaped, and the concave side of the arc faces the handle 2. The positioning portion 13 extends along the radial direction of the arc, and the positioning portion 13 has a sharp end facing the handle 2 to reduce cutting resistance, and the sharp end at least partially protrudes from the bottom surface of the cutting portion 12; the bottom surface of the positioning portion 13 is a plane, which can abut the outer wall of the insulated conductor 92 in the cable protective sheath 91 to prevent the blade of the cutting portion 12 from directly cutting the insulated conductor 92.

[0039] A receiving cavity 21 is provided on the end of the knife handle 2 near the knife head 1, and the bottom end of the receiving cavity 21 is open. A ratchet shaft 5 and a pawl shaft 6 are fixedly provided in the receiving 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, and the end of the pawl 4 away from the pawl shaft 6 is engaged with the teeth on the ratchet 3, which can limit the movement direction of the ratchet 3 so that it can only rotate in one direction when rotating around the ratchet shaft 5.

[0040] Specifically, refer to the attached Figure 2 From the perspective of the present invention, restricted by the pawl 4, the ratchet 3 can only rotate clockwise around the ratchet shaft 5, while squeezed by the ratchet 3, the pawl 4 can rotate counterclockwise around the pawl shaft 6 and temporarily disengage from the recessed portion of the tooth on the ratchet 3 (but not from the outermost end of the tooth).

[0041] More specifically, some of the teeth of the ratchet 3 extend out of the bottom opening of the accommodation cavity 21, and the part of the ratchet 3 extending out of the accommodation cavity 21 is used to contact the cable protective cover 91, providing a fulcrum for the use of the cutting knife, and a reset spring 7 is constructed between the pawl 4 and the ratchet 3. The two ends of the reset spring 7 are respectively connected to the inner wall of the accommodation cavity 21 and the pawl 4, and are used to drive the pawl 4 to return to the recessed part of the teeth on the ratchet 3, so that it engages and clamps the ratchet 3.

[0042] In order to smoothly cut the cable protective sheath 91 , the diameter of the ratchet 3 should be optimized as follows: the diameter of the ratchet 3 is controlled so that the bottom surface of the ratchet 3 is higher than the bottom surface of the cutter head 1 .

[0043] Reference Attachment Figure 2 From the perspective of the present invention, the connecting handle portion 11 is located at the top of the cutting portion 12, the left end of the connecting handle portion 11 is connected to the cutting portion 12, and the right end is connected to the handle 2 through the handle shaft 8; the cutting portion 12 is arc-shaped, and the blade is located on the cutting portion 12, and the arc and the blade of the cutting portion 12 are both facing right; the positioning portion 13 is located at the bottom end of the cutting portion 12, and in the top projection, the positioning portion 13 is gradually narrowed from left to right to form a sharp end, and the sharp end partially exceeds the bottom surface of the cutting portion 12.

[0044] Reference Attachment Figure 2From the perspective of the present invention, when using the above-mentioned cutting knife to cut the cable protective sheath 91, first clamp the cutter head 1 on the left end surface of the cable 9 so that the sharp end of the positioning portion 13 is inserted into the cable protective sheath 91; lift the right end of the handle 2 upwards and rotate the left end of the handle 2 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 placed on the outer surface of the cable protective sheath 91, and the handle 2 is pulled horizontally to the right. If the cutting knife can be pulled smoothly and the cable protective sheath 91 is cut, the handle 2 is continuously pulled horizontally to the right so that the blade of the cutter head 1 cuts the cable protective sheath 91. If the cutting knife cannot be pulled smoothly, that is: cutting If the cutting resistance is too large, press down the right end of the knife handle 2 to make the left end of the knife handle 2 rotate clockwise around the knife handle shaft 8. At this time, since the bottom end of the ratchet 3 is tightly pressed against the outer surface of the cable protective cover 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, press down and move the knife handle 2 to the right at the same time, so that the ratchet 3 can rotate clockwise around the knife handle shaft 8 together with the knife handle 2, and in this process, the contact point between the ratchet 3 and the cable protective cover 91 changes, thereby driving the knife head 1 to move slowly to the right, thereby achieving labor-saving cutting of the cable protective cover 91.

[0045] If you want to continue cutting using the method of "pressing down and moving the knife handle 2 to the right", each time you press the knife handle 2 to the limit position, the cutter head 1 will cut the cable protective cover 91 for a shorter distance, and then lift the knife handle 2 to rotate it counterclockwise around the knife handle axis 8, and control the lifting force so that the ratchet 3 does not contact the cable protective cover 91 during the counterclockwise rotation of the knife handle 2. After the knife handle 2 rotates counterclockwise to the limit position, lower the height of the ratchet 3 so that the ratchet 3 contacts the cable protective cover 91, and repeat the above-mentioned "pressing down and moving the knife handle 2 to the right" operation to cut the cable protective cover 91.

[0046] The above-mentioned "pulling the knife handle 2 horizontally to the right" is suitable for cutting thinner cable protective sheaths 91. During this process, the ratchet 3 will rotate clockwise around the ratchet shaft 5, reducing the friction resistance of the cutting knife; and the above-mentioned "pressing down and moving the knife handle 2 to the right" is suitable for cutting thicker cable protective sheaths 91. During this process, the ratchet 3 will rotate clockwise around the knife handle shaft 8, thereby pulling the knife head 1 to the right to cut the cable protective sheath 91, and the surface of the positioning part 13 away from the cutting part 12 can be against the outer wall of the insulated conductor 92 in the cable protective sheath 91, so that the blade of the cutting part 12 cannot contact the insulated conductor 92, thereby avoiding direct cutting of the insulated conductor 92.

[0047] Compared with the prior art, the benefits of the present invention include at least the following: the cutting knife provided by the present technical solution is suitable for cutting cable protective sheaths 91 of different thicknesses through different cutting operation modes, which can reduce the types and number of tools carried by workers and reduce the load; and compared with the wallpaper knife, the positioning part 13 in the present cutting knife can protect the insulated electric conductor 92, preventing the cutting part 12 from directly cutting the insulated electric conductor 92 inside the cable protective sheath 91, thereby improving the cutting quality.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cable sheath cutter, characterized in that: include: knife handle; a cutter head, the cutter head being rotatably connected to the cutter handle, with the cutting edge thereof facing the cutter handle; A ratchet, the ratchet being movably sleeved on a ratchet shaft in the knife handle; A pawl is engaged with the ratchet and is used to limit the relative rotation between the ratchet and the ratchet shaft when the knife handle is pressed down.

2. The cable sheath cutter according to claim 1, characterized in that: The blade head includes a handle connecting portion, a cutting portion and a positioning portion connected in sequence, wherein the handle connecting portion connects the cutting portion and the handle; the blade is at least arranged on the cutting portion; and the positioning portion has a sharp end facing the handle.

3. The cable sheath cutter according to claim 2, characterized in that: The cutting portion is arc-shaped, with the concave side of the arc facing the knife handle.

4. The cable sheath cutter according to claim 3, characterized in that: The positioning portion extends along the radial direction of the arc, and the sharp end at least partially exceeds the bottom surface of the cutting portion.

5. The cable sheath cutter according to any one of claims 1 to 4, characterized in that: A placement cavity with an opening at the bottom end is provided in the knife handle, the ratchet shaft is fixed in the placement cavity, and part of the teeth of the ratchet extend out of the bottom end opening of the placement cavity.

6. The cable sheath cutter 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 sheath cutter according to claim 6, characterized in that: A pawl shaft is arranged in the accommodating 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.

8. The cable sheath cutter according to claim 7, characterized in that: A reset spring is arranged in the placement cavity, and two ends of the reset spring are respectively connected to the inner wall of the placement cavity and the pawl, so as to drive the pawl to reset and engage the ratchet.

9. The method for using the cable sheath cutter according to any one of claims 1 to 8, characterized in that: Including steps: Place the cutter head on the long end of the cable so that the blade of the cutter head faces the cable protective sheath to be cut; Rotating the knife handle toward the cable protective sleeve to drive the ratchet wheel to approach and abut against the cable protective sleeve; The knife handle is moved laterally or rotated toward the cable protective sleeve to drive the knife head to cut the cable protective sleeve.

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