JPS6349048Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field of the invention) The present invention relates to a cable terminal insulation cutting tool.
In particular, the present invention relates to a cutting tool suitable for cutting the insulator end of a cable with a thick insulation thickness into a pencil shape.

(Technical background of the invention) When connecting cross-linked polyethylene cables,
The conductor is exposed, the insulator is ground into a conical shape with the exposed conductor side having a smaller diameter, the internal semiconductive layer on the conductor is peeled off, and the conductors are connected with a compression sleeve.

Next, semiconducting tape is wound around the conductor and the sleeve, and the annular space with a trapezoidal cross section between the conically cut insulators on both sides is filled by winding polyethylene tape containing a crosslinking agent. The layer is heated and melted to complete crosslinking and terminate the connection.

In the above connection process, the insulator is sharpened using a pencil sharpener.
The cable end cutting tool shown in No. 1) was disclosed.

In the disclosed tool, as shown in FIG. 1, a fixed gripping member 1 having a shallow V-shaped notch 1a faces a frame structure bottom plate 2 with the V-shaped notch 1a inside, and both are connected to a pair of frames. They are connected by structure side plates 3 to form a rectangular frame structure 4. Note that the fixed gripping member 1
is engaged with a groove (not shown) provided on the inner surface 3a of the side plate 3 in the longitudinal direction of the side plate. In addition, a movable gripping member 5 having a V-shaped notch 5a opposite to the V-shaped notch 1a is slidably engaged in the groove.
An adjusting screw 7 attached to a handle 6 loosely fitted to the bottom plate 2 is screwed into this member. A handle 6' is attached to the fixed gripping member 1.

A U-shaped guide plate 8 is attached at a position facing the outer surface of both side plates 3 with its opening facing the outer surface.

A knife holder 9' that supports a knife 9 that will be explained later.
A guide holder 10' supporting a guide 10, which will be described later, has link pieces 1 of equal length on both sides.
They are connected by a two-bar link formed by connecting two parts.
Therefore, the connecting pin 12 at the connecting point of each link piece is U
It is engaged with the long hole 8a formed by the letter-shaped guide 8 and the outer surface of the side plate.

As shown in FIG. 2, the blade 9 has a cutting edge 9 at an angle a that matches the slope of the conical surface on which the insulator is to be cut.
a, one side edge is provided with a cutting edge 9b, and the tip 10a of the guide 10 is spherical. Further, the surface of the guide 10 on the side of the cutting edge 9b is slightly retracted from the cutting edge 9b. Note that the knife holder 9' fixes the knife 9 with a screw 14.
The guide holder 10' is attached to the guide 10 by the screw 15.
is fixed. The fixed gripping member 1 of the frame structure is provided with a cutter guide frame 16 through which the cutter passes, and this guide frame is provided with a cutter fixing screw 17.

Further, in FIG. 1, spring support shafts 18 are provided on both sides of the cutter of the cutter holder 9', and spring support shafts 19 are provided on both sides of the guide of the guide holder 10'. Further, spring bearing shafts 20 and 21 are respectively provided upright at positions close to the connection points of the cutter holder 9' and the guide holder 10' of the link piece 11.

The spring 22 is a helical spring with the end projecting in the tangential direction, and is engaged with each spring support shaft 18, 19, and the end is connected to the blade holder 9' side spring bearing shaft 20 and the guide holder 10' side spring bearing shaft 21. The direction in which the angle between the pair of linked link pieces 11 decreases, that is, the direction in which the angle between the pair of linked link pieces 11 is reduced, that is, between the cutter holder 9' and the guide holder 10'. A spring force is applied in a direction in which the guide holders 10' approach each other.

The blade holder 9' also includes a blade guide frame 16.
A set screw 23 whose tip is in contact with the surface facing the blade holder 9' is screwed together.

The tool configured as described above is used in the following manner. First, as shown in FIG. 3, the frame structure 4 is engaged with the insulator I at the tip of the cable so that the cutting edge 9b faces the end face of the insulator I. At this time, the movable gripping member 5
The pressing force against the insulator I is set to a level that allows rotation of the frame structure 4. The cutting tool 9 is fixed to the frame structure 4 with screws 17 at a position where the leading edge of the cutting edge 9a protrudes to the point where it reaches the internal semiconductive layer. 4, the cutting edge 9b scrapes off the insulator I in the axial direction, and at this time, the cutting edge 9a scrapes off the insulator I in the radial direction. As a result, the internal semiconducting layer S is exposed and so-called opening is performed.

Next, the set screw 23 is pushed forward against the guide frame 16 to open the distance between the blade holder 9' and the guide holder 10' against the spring force of the spring 22.

In this state, the tip 10a of the guide 10 is brought into contact with the starting part of the slope formed by the above-mentioned opening. When this is done, screws 14 and 15 are tightened, screws 17 and set screws 23 are loosened, and the cutter 9 and guide 10 are pressed against the cable insulator with a certain surface pressure by the spring force of the spring 22, and the frame is pressed. Rotate structure 4. This allows the cutting edge 9
The insulators a and 9b are scraped off in the same manner as above.

Since the cutting edge 9a has an inclination that matches the inclination of the conical surface, the peripheral surface of the insulator after being scraped off has a conical shape. As the cutting progresses in this manner, the guide 10 is pushed by the formed conical surface and moves radially outward. This causes each two-bar link to be extended and the blade 9 to be moved radially outwards in accordance with the blade holder 9'.

In other words, the cutting tool 9 cuts a conical surface following the conical surface formed by itself.

The situation is shown in FIG.

(Problems in the Background Art) In the cable insulation cutting tool disclosed by the applicant described above, when cutting a cable with a thick insulation thickness, for example, a CV cable having an insulation layer with a wall thickness of 20 mm or more, a penciling operation is required. As the process progresses, the amount of rotation of the two-bar link increases, and for this reason, the
The torsional force of the spring 22 provided on the joint link also gradually increases, and the cutter holder 9' and the guide holder 10' are subjected to a considerable force in the direction of the center of the tool.

On the other hand, as the penciling operation progresses, the guide 10 moves outward from the tool along the slope of the penciling, so the direction of movement of the guide holder 10' is opposite, and the set screw 15 is not sufficiently tightened. This causes slippage between the guide holder 10' and the guide 10, making it impossible to pencil in a predetermined shape. In addition, in the above-mentioned conventional tool, the push screw 23 is used to set the cutter 9 and guide 10 on the surface of the cable insulator by applying a certain surface pressure at the initial stage of the cutting operation. The operation method for adding files was quite complicated.

(Purpose of the invention) The present invention has been made based on the above-mentioned circumstances, and is an improvement on the cable insulation cutting tool disclosed in Japanese Patent Application No. 56-193353 filed by the present applicant. The object is to obtain a cable insulation cutting tool capable of pencilling.

(Summary of the invention) In this invention, the patent application shown in Fig.
The above object is achieved by omitting the set screw 23 of the tool disclosed in No. 56-193353, and by providing a threaded groove on the outer periphery of the guide 10 so that it can be screwed into the guide holder so as to be able to move forward and backward.

(Embodiment of the invention) The invention will be described below with reference to FIG. 4, in which parts common to FIGS. 1 and 2 are given the same reference numerals.

In FIG. 4, the guide 10 has a threaded groove 10b formed on its outer periphery, and is screwed into a threaded hole provided in a guide holder 10'. The guide frame 5b of the movable gripping member 5 is provided with a through hole large enough to allow the guide 10 to move freely. The embodiment shown in FIG. 4 has the same structure as that shown in FIG. 1 except for the guide 10 and guide holder 10' described above.

However, the part corresponding to the set screw 23 shown in FIG. 1 is omitted.

The apparatus according to the present invention having the above configuration is used in the following manner. First, in the same manner as the tool shown in FIG. 1, the portion shown in FIG. 3 S is cut, ie, cut out. Next, in order to bring the cutter 9 and the guide 10 into contact with the cable insulator surface with a certain surface pressure at the initial stage of penciling, after loosening the fixing screw 15, the distance between the cutter holder 9' and the guide holder 10' is expanded. Rotate the guide 10 to

Next, the fixing screw 14 is loosened and the blade 9 is moved until the tip comes into contact with the surface of the cable insulator, and the screw 14 is tightened to fix the blade 9 to the blade holder 9'.

Finally, move the guide 10 in the opposite direction from 1/2 to
One rotation allows the spring 22 to bring the tips of the blade 9 and guide 10 into contact with the surface of the cable insulator with appropriate surface pressure. Preparation for work is completed by tightening the screw 15 so that the guide 10 does not rotate. After this, as mentioned above, move the frame structure 4 to the cutting edge 9.
A predetermined penciling can be performed by rotating b while it is in contact with the end face of the cable insulator.

(Effect of the invention) As mentioned above, in the tool of the present invention, the guide is screwed into the guide holder, so even if the amount of movement of the guide and the two-bar link increases and the force of the spring 22 increases, the guide and the guide Penciling in a predetermined shape can be performed without causing slippage between the pencil and the holder.

Furthermore, the operation of bringing the tip of the cutter and guide into contact with the cable insulator with a certain surface pressure is easier than with conventional products, so the efficiency of cable end processing work can be improved.

[Brief description of the drawings]

Figures 1A and 1B are front views showing conventional cutting tools;
2 is a perspective view of the cutter, FIG. 3 is an explanatory view of the cutting state, and FIGS. 4A and 4B are front views showing an embodiment of the present invention. 1... Fixed gripping member, 2... Movable gripping member, 3
... side plate, 4 ... frame structure, 5 ... fixed gripping member,
6,6'...handle, 7...adjustment screw, 8...
U-shaped guide plate, 9...Blade, 9a, 9b...Blade tip, 9'...Blade holder, 10...Guide, 10
a...Guide tip, 10b...Thread groove, 11...
Link piece, 10'... Guide holder, 16... Blade guide frame, 12... Pin, 22, 24... Spring, 17... Screw.

Claims (1)

[Scope of utility model registration request] A short-shaped frame structure is formed by connecting a fixed gripping member having a V-shaped cutout and facing the frame structure bottom plate with the V-shaped cutout facing inward by a pair of side plates, and a movable gripping member having a V-shaped notch opposite to the V-shaped notch slidably engaged with the V-shaped notch; a U-shaped guide plate attached to the side plate with an opening facing the outer surface of both side plates of the frame structure; A cutter holder that holds a cutter with an inclined cutting edge that matches the conical surface to be used at the tip and a cutting edge on one side edge, a guide holder positioned opposite to the cutter, and link pieces of equal length are combined. a pair of two-bar links that connect the side surfaces of the two holders by engaging respective coupling points with U-shaped guide plates; and a spring that applies a spring force in a direction that reduces the angle formed by the two-bar link. A cable terminal insulator cutting tool comprising: a cable terminal insulator cutting tool, characterized in that the guide is screwed into and attached to a guide holder so that it can move forward and backward.