JP7707698B2 - Cable Stripping Tool - Google Patents

Description

The present invention relates to a cable stripping tool.

Conventionally, when stripping the insulation of CV cables for low-voltage power supply, this was done manually using an electrician's knife. However, when the insulation was stripped, not only was the live part exposed, but the electrician's knife itself became a live part, posing safety issues.

As another example of prior art, Patent Document 1 discloses a sheath stripping tool with a structure similar to a pipe cutter. The cable sheath stripping tool described in Patent Document 1 can cut the sheath circumferentially when the rotary blade unit is positioned perpendicular to the axial direction of the cable, and can cut the sheath spirally when the rotary blade unit is positioned obliquely. It then makes a spiral cut from the cut line toward the cable end, and grabs the tip of the sheath that has been cut spirally with pliers or the like and pulls it off, thereby quickly and easily stripping the sheath from the circumferential cut line in the form of a series of spiral stripping pieces.

JP 2012-244889 A

However, while the insulation stripping tool described in Patent Document 1 can perform circular and vertical cutting (spiral cutting in Patent Document 1), it is troublesome to have to use a separate clamping tool (pliers, etc.) to peel the insulation (insulation) off the conductor. In addition, there are problems in that pliers and other tools become live parts when working with live wires, and the time required to work varies greatly depending on the skill of the worker.

The present invention aims to provide a coating stripping tool that can make cuts in the coating without exposing the live part and can strip the coating without using a clamping tool such as pliers.

In order to solve the above problems, a typical configuration of a cable sheath stripping tool according to the present invention is characterized in that it comprises a receiving piece and a pushing piece that hold the cable, and a clamp that presses the pushing piece against the receiving piece, and that the receiving piece and the pushing piece have two semicircular horizontal blades that are perpendicular to the axial direction of the cable, each at both ends of the stripping range, and further, at least one of the receiving piece or the pushing piece has a vertical blade that is parallel to the axial direction of the cable and is shifted from the axis of the cable so as not to come into contact with the conductor in the center of the cable.

According to the above configuration, by pressing the pushing piece against the receiving piece and cutting with the horizontal and vertical blades, the covering can be cut in both circles and vertically at the same time. And because the vertical blade is shifted from the axis of the cable, the covering (sheath and insulator) can be raised (peeled off from the conductor) by the vertical blade when cutting, and the vertically cut portion of the insulator opens after the tool is released. This makes the vertically cut portion accessible by hand, making it easy to strip without using a clamping tool. Furthermore, because the vertical blade is shifted from the axis of the cable, the cable rotates slightly when the pushing piece is pushed forward, making it easier to cut with the horizontal blade.

It is preferable that the receiving piece and the pushing piece are provided with a protective cover made of insulating resin. This prevents the live parts (horizontal blade and vertical blade) from being exposed.

It is preferable that the length of the vertical blade is such that the edge of the vertical blade approaches the center of the cable as closely as possible when the horizontal blade cuts deep into the cable's insulation. This allows for deep cuts to be made without damaging the conductor as much as possible.

It is also preferable that the vertical blade is inclined in the direction that peels off the incised coating with respect to the relative movement direction of the receiving piece and the pushing piece. This allows the opening of the vertical cut part to be made larger, making it easier to grasp with the hand.

The present invention provides a coating stripping tool that can make cuts in the coating without exposing the live part and can strip the coating without using a clamping tool such as pliers.

FIG. 2 is an exploded view of the main components of the coating stripping tool according to the present embodiment. FIG. FIG. 13 is a diagram in which the cover of the coating stripping tool is omitted. 13 is a diagram showing the state of the receiving piece, the pushing piece and the cable before being cut. FIG. 13 is a diagram showing a state in which the receiving piece and the pushing piece cut into the cable sheath. FIG. FIG. 13 illustrates an example of a cable with cuts.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiment are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations, and elements not directly related to the present invention are not illustrated.

Figure 1 is an exploded view of the main components of the coating stripping tool 100 according to this embodiment. Figure 2 is an assembly diagram, with Figure 2(a) showing the clamp in an open state and Figure 2(b) showing the clamp in a closed state. Figure 3 is a diagram without the cover, with Figure 3(a) showing the clamp in an open state and Figure 3(b) showing the clamp in a closed state.

As shown in FIG. 1, the sheath stripping tool 100 of this embodiment is composed of a receiving piece 300 and a pushing piece 400 that hold the cable 10 (see FIG. 4 and FIG. 6), and a clamp 200 that presses the pushing piece 400 toward the receiving piece 300. In this embodiment, the cable 10 is a CV cable (Cross-linked polyethylene insulated vinyl sheath cable), and has an insulator 14 made of cross-linked polyethylene on the outside of the conductor 12, and a vinyl sheath 16. Hereinafter, the insulator 14 and the sheath 16 will be collectively referred to as the sheath.

The frame 210 of the clamp 200 has a linear rail groove 220 formed in the longitudinal direction, and an upper jaw 230 formed at one end. A female thread 242 is formed in a block 240 at the end opposite the upper jaw 230, and a bolt 252 is screwed into the block 240. A lower jaw 250 is rotatably supported on the inside of the bolt 252, and a handle 254 is attached to the outside of the bolt 252. The lower jaw 250 has a slider 256 and is slidably fitted into the rail groove 220. Therefore, when the handle 254 is turned to rotate the bolt 252, the lower jaw 250 can be moved toward and away from the upper jaw 230.

Two pins 260 are provided near the upper jaw 230 of the frame 210, which can be fitted into boss holes (not shown) of the receiving piece 300. A stopper 262 is also provided on the top of the upper jaw 230 to prevent the receiving piece 300 fitted into the pins 260 from falling off. Similarly, two pins 270 are provided on the slider 256 of the lower jaw 250, which can be fitted into boss holes (not shown) of the pushing piece 400. A stopper 272 is provided on the top of the lower jaw 250 to prevent the pushing piece 400 fitted into the pins 270 from falling off.

As shown in FIG. 3, two side blades 310 with semicircular edges are arranged on the receiving block 300. The two side blades 310 are arranged perpendicular to the axial direction of the cable 10 and at both ends of the coating stripping range.

The push piece 400, like the receiving piece 300, is provided with two side blades 410 with semicircular edges. The two side blades 410 are arranged in a direction perpendicular to the axial direction of the cable 10, at both ends of the stripping range. The side blades 310 of the receiving piece 300 and the side blades 410 of the pushing piece 400 are in opposing positions (facing each other), and by pushing the pushing piece 400 toward the receiving piece 300, a circular cutting line 20 (see FIG. 6) is cut into the coating (insulation 14 and sheath 16) of the cable 10.

The receiving piece 300 is further provided with a vertical blade 320 that is parallel to the axial direction of the cable 10. The width of the vertical blade 320 corresponds to the length of the stripping range, i.e., the distance between the two horizontal blades 310. The vertical blade 320 cuts a vertical cut line 30 (see FIG. 6) into the coating (insulation 14 and sheath 16) of the cable 10.

Figure 4 shows the state of the receiving piece 300, the pushing piece 400, and the cable 10 before they are cut, with Figure 4(a) being a side view and Figure 4(b) being a front view. Figure 5 shows the state after the cable sheath has been cut. Figure 6 shows an example of the cable with cuts made.

As shown in FIG. 4, the vertical blade 320 is shifted parallel to the axis of the cable 10 relative to the direction of movement of the push piece 400, and is positioned so that it does not come into contact with the conductor 12 at the center of the cable 10. In other words, the vertical blade 320 does not cut directly into the conductor 12, but cuts by passing by the side of the conductor 12, as shown in FIG. 5.

As shown in FIG. 5, when the push piece 400 hits the receiving piece 300, the horizontal blades 310, 410 and vertical blades 320 stop cutting. The dimensions of the horizontal blades 310, 410 are adjusted so that their edges do not reach the conductor 12. The length of the vertical blade 320 is preferably such that the edge of the vertical blade 320 comes closest to the axis of the cable 10 when the horizontal blades 310, 410 cut the most into the coating (insulation 14, sheath 16) of the cable 10. Coming closest means that the radial distance from the axis of the cable 10 is the shortest. This allows the conductor 12 to be cut deeply without damaging it as much as possible.

Furthermore, the vertical blade 320 is inclined in the direction in which the cutting coating is peeled off relative to the direction of movement of the push piece 400. A suitable rake angle α of the vertical blade 320 is 14°. This angle of 14°, combined with the rotation of the cable 10, is the optimal angle at which the insulation 14 can be peeled off without coming into contact with the conductor 12.

According to the above configuration, by pressing the pusher 400 against the receiving piece 300 and cutting the horizontal blades 310, 410 and the vertical blade 320, the coating (insulator 14 and sheath 16) can be cut in both directions at the same time.

And because the vertical blade 320 is shifted from the axis of the cable 10, the vertical blade 320 can raise the covering (peel it off from the conductor 12) when cutting, and the vertical cut portion of the insulator 14 opens after the tool is released.

As shown in FIG. 6, horizontal blades 310 and 410 form circular cut lines 20 on the cable 10, and vertical cut lines 30 are formed by the vertical blade 320. One side of the vertical cut line 30 is lifted from the cable 10 by the vertical blade 320, forming a tab-shaped vertical cut portion 32.

This allows the vertical cut portion 32 to be grasped by hand, making it easy to peel off without using a pinching tool such as pliers. In particular, because the vertical blade 320 is inclined relative to the push piece 400, the opening of the vertical cut portion 32 can be made larger, making it even easier to grasp by hand.

In this way, the present invention provides a coating stripping tool that can make cuts in the coating (insulator 14, sheath 16) without exposing the live part, and can strip the coating without using a clamping tool such as pliers.

In addition, because the vertical blade 320 is shifted from the axis of the cable 10, the cable 10 rotates slightly when the push piece 400 is pushed forward, which also has the effect of making it easier for the horizontal blades 310, 410 to cut the cable.

As shown in Figures 1 and 2, the receiving piece 300 has a side cover 330 made of insulating resin on the side. The side cover 330 has a notch 332 into which the cable 10 fits. The front of the receiving piece 300 is also provided with a protective cover 340 made of insulating transparent resin. This makes it possible to perform work while observing the state of the cut.

On the other hand, a sliding cover 420 made of insulating resin is provided on the side of the push piece 400. The sliding cover 420 is biased toward the receiving piece 300 by a spring 422 (see FIG. 4(b)) as shown in FIG. 2(a). When the push piece 400 abuts against the receiving piece 300, the sliding cover 420 abuts against the side cover 330 and slides back as shown in FIG. 2(b).

These side covers 330, protective cover 340, and slide cover 420 can prevent the live parts (horizontal blades 310, 410 and vertical blade 320) from being exposed while working with the coating stripping tool 100. This ensures the safety of the worker.

Although the preferred embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

The present invention can be used as a tool for stripping the insulation of CV cables.

10...cable, 12...conductor, 14...insulator, 16...sheath, 20...slicing line, 30...vertical cutting line, 32...vertical cutting portion, 100...tool, 200...clamp, 210...frame, 220...rail groove, 230...upper jaw, 240...block, 242...female thread, 250...lower jaw, 252...bolt, 254...handle, 256...slider, 260...pin, 262...stopper, 270...pin, 272...stopper, 300...receiving piece, 310...horizontal blade, 320...vertical blade, 330...side cover, 332...notch, 340...protective cover, 400...push piece, 410...horizontal blade, 420...slide cover, 422...spring

Claims (2)

In cable stripping tools,
A receiving piece and a pushing piece for clamping the cable;
a clamp for pressing the pushing piece toward the receiving piece,
The receiving piece and the pushing piece are provided with two semicircular side blades perpendicular to the axial direction of the cable, at both ends of the stripping range,
Furthermore, at least one of the receiving piece and the pushing piece has a vertical blade parallel to the axial direction of the cable, the vertical blade being shifted from the axial center of the cable so as not to come into contact with the conductor at the center of the cable ,
A cable sheath stripping tool, characterized in that the vertical blade is inclined in a direction to strip the cut sheath with respect to the relative movement direction of the receiving piece and the pushing piece . The cable sheath stripping tool according to claim 1, characterized in that the length of the vertical blade is such that the edge of the vertical blade approaches the center of the cable most when the horizontal blade cuts the most deeply into the cable sheath.