Cutting tool

Abstract

To provide a cutting tool capable of stably performing work for making a cut in an intermediate layer such as an external semiconductor layer of a cable with high quality regardless of the outer shape of the cable and the skill of a user such as a worker.SOLUTION: A cutting tool A for making a cut in a cable includes a blade member 1 and a holder member 2 for housing the blade member 1, the blade member 1 has a thin plate shape and is provided with a blade on a bottom surface portion so as to be exposed with a predetermined width, and the holder member 2 is formed by connecting two thin plate portions on one side by a spacer portion 22 so as to be arranged in parallel at a predetermined interval. One side of an upper end of each of the thin plate portions extends, an upper surface of each of the thin plate portions is bent at a substantially right angle, one side of the blade member 1 and one corresponding side of each of the thin plate portions of the holder member 2 are pivotally supported by using a shaft member 31, so that the blade member 1 is rotatably provided with respect to the holder member 2, and the blade member 1 is biased by a spring 32 and housed in the holder member 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cutting tool for making cuts in an intermediate layer such as an outer semiconductive layer of a cable (CV cable) that is mainly buried underground. [Background technology]

[0002] Conventionally, a tool with a cutter knife-like blade has been used to make this type of cut, and a worker or user would use this tool to make cuts in the outer semiconductive layer or other intermediate layer in the cable cross-section direction (i.e., the short direction of the cable) and the axial direction of the cable (i.e., the long direction of the cable), as if slicing the cable in a circle, and then peel off the outer semiconductive layer or other intermediate layer by hand.

[0003] For example, in the background art of Patent Document 1, slits S1 are formed by cutting into a predetermined circumference of the outer semiconductive layer, and it is disclosed that the slits S1 are formed by cutting with a sharp blade such as a cutter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-236937 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] However, the work of cutting into intermediate layers such as the outer semiconductive layer must be done carefully and reliably to meet predetermined construction quality standards, requiring the worker to pay close attention and concentrate.

[0006] Furthermore, when a worker or other user uses a tool with a cutter knife-like blade to make an incision in an intermediate layer such as an outer semiconductive layer, the worker needs to hold the cable with one hand while moving the tool held with the other hand, which tends to make the cut unstable.

[0007] Furthermore, when making cuts in the cable's circular cutting direction (i.e., the short direction of the cable), the worker or user must carefully visually check the position and direction of the blade so that the blade strikes the cable perpendicular to its axial direction (i.e., the cable's longitudinal direction) and make the cut without the blade coming off the cable. If the worker or user were to loosen their grip midway through the process, the cut on the outer semiconductive layer or other intermediate layer could shift from the circumferential direction, causing the start and end points of the cut to no longer match. If a step occurs in the cut on the outer semiconductive layer or other intermediate layer, the cable cannot be properly terminated during cable connection work, posing a risk of current (charge) leaking to the outside.

[0008] Furthermore, when cutting the cable in the axial direction (i.e., the lengthwise direction of the cable), the worker or user must continue to press the tool firmly against the cable to prevent the tool blade from coming off the cable.If the worker or user were to let go of the tool during the operation, the cylindrical outer shape of the cable could cause the tool blade to slip circumferentially and come off the cable.

[0009] For the above reasons, the task of making cuts in intermediate layers such as the outer semiconductive layer of a cable requires skilled techniques, and is a time-consuming and laborious task for users such as inexperienced workers.

[0010] Therefore, in order to address the above problems, the present invention aims to provide a cutting tool that can stably and with high quality perform the work of cutting into intermediate layers such as the outer semiconductive layer of a cable, regardless of the outer shape of the cable or the level of skill of the user such as the worker. [Means for solving the problem]

[0011] In order to achieve the above object, the invention according to claim 1 comprises: A cutting tool for making a cut in a cable, The tool has a blade member provided with a blade and a holder member that houses the blade member, The blade member has a thin plate shape, and a blade is provided on a bottom surface portion thereof so as to be exposed with a predetermined width. The holder member is formed by connecting two thin plate portions at one side by a spacer portion so that the two thin plate portions are arranged in parallel with each other with a predetermined gap therebetween, One side of the upper end of each of the thin plate portions is extended, and the upper surface of each of the thin plate portions is bent at a substantially right angle, one side of the blade member and one side of each thin plate portion of the holder member are pivotally supported by a shaft member, so that the blade member is rotatable relative to the holder member; The blade member is a cutting tool housed in the holder member while being biased by a spring.

[0012] The invention according to claim 2 is as follows: a stopper member is provided at a lower portion of the holder member, the stopper member connecting the two thin plate portions and contacting a part of a bottom surface of the blade member when the blade member is rotated and inclined; The cutting tool is as described in claim 1, wherein the bottom surface of one of the thin plate portions and the bottom surface of the other of the thin plate portions have a cross section that is inclined toward the center of the holder member so as to follow the outer shape of the cable.

[0013] The invention according to claim 3 is as follows: a latch member slidably provided at the upper end of the blade member; The spacer portion associated with the holder member is provided with a through hole, The cutting tool according to claim 1, wherein when the latch member is fitted into the through-hole, the blade member is fixed to the holder member in an inclined state.

[0014] The invention according to claim 4 is as follows: The cutting tool is as described in claim 2 or 3, wherein a part of the bottom surface of the rotated blade member abuts against the stopper member and the blade member is inclined, or when the latch member is engaged with the through hole and the blade member is inclined, a mark is provided on the outside of each thin plate portion corresponding to the lower end of the blade that is inserted into the cable. [Effects of the Invention]

[0015] By using the cutting tool of the present invention, even inexperienced workers or other users can stably cut into intermediate layers such as the outer semiconductive layer of a cable, thereby improving work efficiency and achieving excellent construction quality.

[0016] Furthermore, when a worker or other user makes a cut in the direction of cutting the cable in a circular cut (i.e., the short direction of the cable), the tool of the present invention needs to be rotated around the outer circumference of the cable, and the worker or other user needs to change hands to hold the tool. However, because the blade member of the cutting tool of the present invention is spring-biased in the direction of being stored in the holder member, even if the worker or other user releases the tool to change hands, the blade does not lift up from the intermediate layer, such as the outer semiconductive layer, or the tool does not become detached from the cable, which is convenient. Furthermore, because the tool does not become detached from the cable, the start and end points of the cut do not align and become misaligned.

[0017] Furthermore, because one side of the upper portion of each thin plate portion of the holder member is extended and the top surface of each thin plate portion is bent at a substantially right angle, when the blade member is rotated and the cable is gripped by the bottom surface of the blade member and the top surface of the holder member, the cable is supported at two points on the top surface of the holder member and one point on the bottom surface of the blade member. Therefore, even when the tool according to the present invention is rotated around the outer periphery of the cable, it is stably gripped at three points.

[0018] In particular, in the invention according to claim 2, a stopper member is provided at the lower part of the holder member, connecting the two thin plate portions and abutting a part of the bottom surface of the blade member when the blade member is rotated and tilted. Due to the presence of this stopper member, even if a user such as a worker presses the blade member against the cable, the blade member cannot rotate beyond the stopper member. Therefore, even if the force with which the blade member is pressed varies depending on the user such as a worker, the depth to which the blade penetrates the cable remains constant, thereby achieving excellent installation quality.

[0019] In particular, in the invention of claim 2, the bottom surface of one of the thin plate portions and the bottom surface of the other of the thin plate portions are configured so that their cross sections are inclined toward the center of the holder member so as to follow the outer shape of the cylindrical cable.Therefore, when a worker or user makes an incision in the axial direction of the cable (= the longitudinal direction of the cable) on an intermediate layer such as an outer semiconductive layer, the tool can be positioned along the outer shape of the cable, and the tool can be moved stably in the axial direction of the cable, which is convenient.

[0020] In particular, in the invention of claim 3, when the latch member is fitted into the through hole, the blade member is fixed to the holder member in an inclined state, so that a user such as a worker can conveniently make an incision in the axial direction of the cable (= the longitudinal direction of the cable) simply by holding the tool in his / her hand and pressing it against the cable without worrying about the blade member rotating.

[0021] In particular, in the invention of claim 4, when a part of the bottom surface of the rotated blade member abuts against the stopper member and the blade member is tilted, or when the latch member is fitted into the through hole and the blade member is tilted, a mark is provided on the outside of each thin plate portion that corresponds to the lower end of the blade that is inserted into the cable.This allows a user such as an operator to check the position of the blade simply by looking at the holder member from the outside, which is convenient when making an incision in the axial direction of the cable (= the longitudinal direction of the cable). [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a front view showing the configuration of a cutting tool according to a first embodiment of the present invention. [Figure 2] 1 is a bottom view showing the configuration of a cutting tool according to a first embodiment of the present invention. FIG. [Figure 3] 1 is a plan view showing the configuration of a cutting tool according to a first embodiment of the present invention. [Figure 4] 1 is a view showing the configuration of a cutting tool according to a first embodiment of the present invention, viewed from the right side. [Figure 5] 1 is a left side view showing the configuration of a cutting tool according to a first embodiment of the present invention. [Figure 6] 1 is an explanatory diagram illustrating the procedure for using the cutting tool according to the first embodiment of the present invention, in which (a) shows the blade member stored in the holder member, and (b) shows the blade member rotated and the cable gripped by the blade member and holder member when making a cut in the short direction of the cable. [Figure 7] FIG. 1 is an explanatory diagram illustrating the procedure for using the cutting tool according to the first embodiment of the present invention, showing the state in which the blade member is rotated and the cable is gripped by the blade member and holder member when making an incision in the short direction of the cable. [Figure 8] FIG. 1 is an explanatory diagram illustrating the procedure for using the cutting tool according to the first embodiment of the present invention, showing the state in which the cutting tool is pressed against the outer shape of the cable when making an incision in the longitudinal direction of the cable. [Figure 9] FIG. 1 is an explanatory diagram illustrating the procedure for using the cutting tool according to the first embodiment of the present invention, showing the state in which the cutting tool is pressed against the outer shape of the cable when making an incision in the longitudinal direction of the cable. [Figure 10] FIG. 1 is a diagram showing the general structure of a CV cable. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the components described in the embodiment are merely examples and are not intended to limit the scope of the present invention.

[0024] <Embodiment Example 1> FIG. 1 is a front view showing the overall configuration of a cutting tool A according to the first embodiment.

[0025] As shown in Figure 1, cutting tool A is a tool used to make cuts in intermediate layers, such as the outer semiconductive layer, of cables such as CV cables (crosslinked polyethylene insulated vinyl sheath cables), which are widely used as power cables and are primarily buried underground. The outer semiconductive layer is the layer between the shielding copper tape and the insulator in a CV cable, as shown in Figure 10. While Figure 10 shows a CV cable with a five-layer structure consisting of "conductor → insulator → outer semiconductive layer → shielding copper tape → cable sheath," this structure is not limited to this. For example, a six-layer structure consisting of "conductor → inner semiconductive layer → insulator → outer semiconductive layer → shielding copper tape → cable sheath" is also acceptable. Therefore, the term "intermediate layer" refers to layers other than the "conductor" and "cable sheath," such as the "inner semiconductive layer," "insulator," "outer semiconductive layer," and "shielding copper tape."

[0026] The cutting tool A has a blade member 1 provided with a blade, and a holder member 2 for housing the blade member 1.

[0027] <Configuration of blade member 1> 1 to 6, the blade member 1 has a thin plate shape, and a blade 11 is provided on the bottom surface thereof so as to extend vertically downward and be exposed over a predetermined width (see FIG. 2). The "predetermined width" is, for example, 0.1 mm to 1 mm.

[0028] 1 and 3, a rod-shaped latch member 12 is slidably provided at the upper end of the blade member 1. Furthermore, as shown in FIGS. 1, 5 and 7, a through hole 23 is provided in a spacer portion 22 associated with the holder member 2. When the latch member 12 is fitted into the through hole 23, the blade member 1 is fixed to the holder member 2.

[0029] <Configuration of holder member 2> As shown in FIGS. 1 to 6, the holder member 2 serves to house the blade member 1 between two thin plate portions 21. As shown in FIG. 3, the holder member 2 is formed by connecting two thin plate portions 21 at one side by a spacer portion 22 so that the two thin plate portions 21 are arranged in parallel with a predetermined gap. Specifically, one side of the upper end of each thin plate portion 21 (the left side in FIG. 1) is extended. Therefore, the upper surface (plane) of each thin plate portion 21 is bent at a substantially right angle. Also, as shown in FIG. 3, the two thin plate portions 21 are connected at the upper part of the left side surface by a segment-shaped spacer portion 22. Furthermore, the "predetermined gap" between the thin plate portions 21 is large enough to rotatably house the thin plate-shaped blade member 1.

[0030] 4, 5, and 8, the cross section of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 are inclined toward the center of the holder member 2 so as to follow the outer shape of the cylindrical cable 5. In other words, the cross section of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 form a substantially V-shaped cross section.

[0031] 1 and 6, one side of the blade member 1 and one corresponding side of each thin plate portion 21 of the holder member 2 are pivotally supported by a shaft member 31, so that the blade member 1 is rotatable relative to the holder member 2. Also, as shown in FIG. 1, the blade member 1 is housed between the two thin plate portions 21 of the holder member 2 while being biased by a spring 32.

[0032] 1 and 2, a thin plate-like stopper member 24 is provided at the bottom of the holder member 2. The stopper member 24 connects both thin plate portions 21 and abuts against a portion of the bottom surface of the blade member 1 when the blade member 1 is tilted after being rotated. Specifically, as shown in FIG. 1, when the blade member 1 is tilted after being rotated (in FIG. 1, the left bottom surface of the blade member 1 is tilted lower than the right bottom surface), a portion of the bottom surface of the rotated blade member 1 (the right bottom surface in FIG. 1) abuts against the stopper member 24. Due to the presence of the stopper member 24, even if a user such as a worker presses the blade member 1 against the cable 5, the blade member 1 cannot rotate beyond the stopper member 24. Therefore, even if the force with which the blade member 1 is pressed varies depending on the user such as a worker, the depth to which the blade 11 penetrates the cable 5 remains constant, thereby achieving excellent installation quality.

[0033] Furthermore, when a user such as a worker fits the latch member 12 into the through-hole 23, the rotated blade member 1 is tilted, and a part of the bottom surface of the blade member 1 (the right bottom surface in FIG. 1 ) abuts against the stopper member 24, and the blade 11 (blade member 1) is fixed at an angle that is optimal for making a cut in the axial direction of the cable 5, which is a pre-determined depth of the blade 11 that penetrates the cable 5. With this configuration, the angle of the blade 11 (blade member 1) is fixed to an optimal depth for making a cut in the axial direction of the cable 5 simply by the user such as a worker fitting the latch member 12 into the through-hole 23, thereby achieving excellent construction quality regardless of the skill of the user such as a worker.

[0034] 1 and 6, of the blades 11, a mark 25 is provided on the outside of each thin plate portion 21, which corresponds to the lower end that will be inserted into the cable when part of the bottom surface of the blade member 1 abuts against the stopper member 24 while the rotated blade member 1 is in an inclined state. By providing the mark 25 in this manner, a user such as an operator can confirm the position of the blade 11 simply by looking at the holder member 2 from the outside, which is convenient when making an incision in the axial direction of the cable 5 (= the longitudinal direction of the cable 5).

[0035] <How to use cutting tool A> First, a user such as an operator makes an incision in the cable 5 in the cutting direction (=the short direction of the cable 5) so as to cut the cable 5 in a circle.

[0036] In this case, as shown in Fig. 6(b), a user such as an operator grasps the blade member 1 and the holder member 2, and rotates and pulls out the blade member 1 stored in the holder member 2. Then, as shown in Fig. 7, the cable 5 is grasped by the bottom surface of the blade member 1 and the top surface of the holder member 2 from a direction perpendicular to the cable 5. Because one side of the upper part of each thin plate portion 21 of the holder member 2 is extended and the top surfaces of each thin plate portion 21 are bent at a substantially right angle, when the cable 5 is grasped by the bottom surface of the blade member 1 and the top surface of the holder member 2, the cable 5 is supported at two points on the top surface of the holder member 2 (= two points on the side and bottom parts of the cable 5) and one point on the bottom surface of the blade member 1 (= one point on the top part of the cable 5).

[0037] Then, with the cable 5 held between the bottom surface of the blade member 1 and the top surface of the holder member 2, the user such as an operator moves the blade member 1 downward (or upward) to make one full turn around the outer periphery of the cable 5. The blade 11 slides on an intermediate layer such as an outer semiconductive layer of the cable 5 in the short direction of the cable 5, and makes an incision in the intermediate layer.

[0038] Because the blade member 1 is biased by the spring 32 in the direction of being stored in the holder member 2, even if a user such as an operator lets go of the cutting tool A to change grips, the blade 11 does not float up from the intermediate layer such as the outer semiconductive layer, and the cutting tool A does not become detached from the cable 5, which is convenient. Furthermore, because the cutting tool A does not become detached from the cable 5, when the blade member 1 is made to make one revolution around the outer periphery of the cable 5, the cutting start point and the cutting end point do not coincide and do not become misaligned.

[0039] Next, a user such as an operator makes a cut in the axial direction of the cable 5 (=the longitudinal direction of the cable 5).

[0040] 6(a), a user such as a worker fits the latch member 12 of the blade member 1 into the through-hole 23 of the spacer portion 22, and fixes the blade member 1 to the holder member 2 in a tilted state. Therefore, a user such as a worker can make an incision in the axial direction of the cable 5 (= the longitudinal direction of the cable 5) simply by holding the cutting tool A by hand and pressing it against the cable 5, without having to worry about the blade member 1 rotating.

[0041] 8 and 9, a user such as an operator presses the bottom surface of the holder member 2 against the outer shape of the cable 5 while checking the position of the blade 11 using the mark 25 provided on the outside of the holder member 2, and then moves the cutting tool A in this state. The blade 11 slides on an intermediate layer such as an outer semiconductive layer of the cable 5 in the longitudinal direction of the cable 5, and makes an incision in the intermediate layer. Note that B in FIG. 9 shows the position of the blade 11 when making an incision in the cable 5.

[0042] In this way, by using the cutting tool A, even an inexperienced worker or other user can stably perform the work of cutting into an intermediate layer such as the outer semiconductive layer of the cable 5, thereby improving work efficiency and achieving excellent construction quality.

[0043] Furthermore, the cutting tool A is configured so that the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 have a cross section that slopes toward the center of the holder member 2 so as to follow the outer shape of the cable 5.Therefore, when making an incision in the axial direction of the cable 5, the cutting tool A can be positioned along the outer shape of the cylindrical cable 5, and the cutting tool A can be moved stably in the axial direction of the cable 5.

[0044] Furthermore, since a thin plate portion 21 is provided on each side of the blade 11 which is provided vertically downward on the bottom surface of the blade member 1, even when making an incision in the axial direction of the cable 5, there is no need to worry about injuring the operator or other user, which is convenient.

[0045] The cutting tool A according to the first embodiment has the stopper member 24, the latch member 12, the through hole 23, and the mark 25, and the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 have a cross section that is inclined toward the center of the holder member 2 so as to follow the outer shape of the cable 5. However, the present invention is not limited to the configuration of the cutting tool A.

[0046] For example, the cutting tool may be based on the configuration of cutting tool A but does not have the stopper member 24, the bar member 12, the through hole 23, or the mark 25, and the cross section of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 is not inclined, but the cross sections of both bottom surfaces are horizontal. Also, the cutting tool may be based on the configuration of cutting tool A but does not have the bar member 12, the through hole 23, or the mark 25. Also, for example, the cutting tool may be based on the configuration of cutting tool A but does not have the stopper member 24 or the mark 25, and the cross section of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 is not inclined, but the cross sections of both bottom surfaces are horizontal. Furthermore, the cutting tool may be based on the configuration of cutting tool A but does not have the mark 25. Furthermore, the cutting tool may be based on the configuration of cutting tool A but does not have the bar member 12, the through hole 23, or the mark 25, and the cross sections of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 are not inclined, and both bottom surface portions have horizontal cross sections. Further, the cutting tool may be based on the configuration of cutting tool A but does not have the stopper member 24, the bar member 12, the through hole 23, or the mark 25. Further, the cutting tool may be based on the configuration of cutting tool A but does not have the bar member 12 and the through hole 23. Further, the cutting tool may be based on the configuration of cutting tool A but does not have the stopper member 24, and the cross sections of the bottom surface of one thin plate portion 21 and the bottom surface of the other thin plate portion 21 are not inclined, and both bottom surface portions have horizontal cross sections. [Explanation of symbols]

[0047] A: cutting tool, B: blade position, 1: blade member, 11: blade, 12: latch member, 2: holder member, 21: thin plate portion, 22: spacer portion, 23: through hole, 24: stopper member, 25: mark, 31: shaft member, 32: spring, 5: Cable

Claims

1. A cutting tool for making a cut in a cable, The tool has a blade member provided with a blade and a holder member that houses the blade member, The blade member has a thin plate shape, and a blade is provided on a bottom surface portion thereof so as to be exposed with a predetermined width. The holder member is formed by connecting two thin plate portions at one side by a spacer portion so that the two thin plate portions are arranged in parallel with each other with a predetermined gap therebetween, One side of the upper end of each of the thin plate portions is extended, and the upper surface of each of the thin plate portions is bent at a substantially right angle, one side of the blade member and one side of each thin plate portion of the holder member are pivotally supported by a shaft member, so that the blade member is rotatable relative to the holder member; The cutting tool, wherein the blade member is housed in the holder member while being biased by a spring.

2. a stopper member is provided at a lower portion of the holder member, the stopper member connecting the two thin plate portions and abutting against a part of a bottom surface of the blade member when the blade member is rotated and inclined; The cutting tool according to claim 1, characterized in that the bottom surface of one of the thin plate portions and the bottom surface of the other of the thin plate portions have a cross section that is inclined toward the center of the holder member so as to follow the outer shape of the cable.

3. a latch member slidably provided at the upper end of the blade member; The spacer portion associated with the holder member is provided with a through hole, The cutting tool according to claim 1, wherein when the latch member is fitted into the through-hole, the blade member is fixed to the holder member in an inclined state.

4. 4. The cutting tool according to claim 2 or 3, characterized in that a mark is provided on the outside of each thin plate portion corresponding to the lower end of the blade that is inserted into the cable when a part of the bottom surface of the rotated blade member abuts against the stopper member and the blade member is inclined, or when the latch member is engaged with the through hole and the blade member is inclined.

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