JPH0336066Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] The present invention relates to a cable connection forming device.

[Technical background of the invention and its problems] Conventionally, when molding the connection part of a CV cable, for example, as shown in Fig. 2, the conductor connection part 1
A molding method is carried out in which a molding device 2 is fitted around the outer periphery of the molding device 2, and a crosslinkable polyolefin composition that has been thermally and thermally isolated is press-fitted into a cavity 3 of the molding device 2 and then heated and cured.

As shown in the figure, such a conventional molding device 2 includes a cylindrical outer mold 4 and a conical inner mold whose diameter decreases toward the end, which is inserted into both ends of the outer mold 4. A pair of heat-resistant rubber packings having a tapered surface 5a and an outer tapered surface 5b and a cable insertion hole 5c in the center, and a pair of heat-resistant rubber packings having a cable insertion hole 5c in the center, and a pair of packings 5 made of heat-resistant rubber that are in contact with both outer tapered surfaces 5b of the packings 5 and inserted into the outer mold 4. An inner mold 6 having an inner tapered surface 6a and a cable insertion hole 6b in the center, and an outer mold 4.
It consists of an annular presser fitting 7 which is removably fixed to the end face with a bolt.

However, in such a conventional molding device 2, the pressure applied to the cable 8 during resin injection is high at the molding section of the molding device, and although it gradually decreases at the packing section 5, it shows a discontinuous pressure drop at the end of the mold. However, there was a problem in that a lump-like bulge was formed in the cables 8 on both sides of the molding device 2. In order to prevent this bulge, a presser tape 9 has been wrapped around the area, but with this method alone, the presser is incomplete and the bulge cannot be completely prevented.

[Purpose of the invention] The present invention was made to solve these conventional difficulties.The pressure applied to the cable during resin injection is not discontinuous at the end of the mold, and therefore the molding after resin injection is It is an object of the present invention to provide a cable connection forming device that can prevent cables from bulging on both sides of the device.

[Summary of the invention] In other words, the cable connection forming device of the invention has the following features:
A pair of cylindrical outer molds, and a conical inner tapered surface and outer tapered surface whose diameter decreases toward the end inserted into both ends of the outer mold, and a tapered surface insertion hole in the center. heat-resistant rubber packing, and an inner mold having an inner tapered surface inserted into the outer mold with its inner tapered surface abutting each outer tapered surface of these packings, and a cable insertion hole in the center. , a cable connection part molding device comprising an annular presser fitting detachably fixed to an end surface of the external mold, wherein the inner tapered surface of the internal mold has a tapered surface closer to the cable insertion hole than the outer tapered surface; By forming a packing relief section consisting of a surface, the pressure applied to the cable during resin injection is prevented from becoming discontinuous at the end of the mold.

[Example of idea] Examples of the present invention will be described below.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
Portions common to those in the conventional example shown in FIG. 2 are designated by the same reference numerals.

In FIG. 1, the cable connection device 2 of this embodiment includes a cylindrical external mold 4 and a cylindrical external mold 4.
A pair of heat-resistant rubber packings made of silicone rubber or the like, which have a conical inner tapered surface 5a and an outer tapered surface 5b whose diameter decreases toward the terminal side, and which have a cable insertion hole 5c in the center. 5
and both outer tapered surfaces 5 of these packings 5
The inner mold 6 has an inner tapered surface 6a inserted into the outer mold 4 in contact with the inner mold 6 and has a cable insertion hole 6b in the center, and the inner mold 6 is removably fixed to the end surface of the outer mold 4 with a port. It is similar to the conventional cable forming apparatus in that it is composed of an annular presser metal fitting 7.

Therefore, in the present invention, a packing is formed of a tapered surface that is inclined from the outer tapered surface 5b of the packing 5 over a length of 10 to 20 mm on the inside tapered surface 6a of the internal mold 6, near the cable insertion hole. A relief portion 10 is formed.

Although not shown, the external mold 4 of this molding device has a built-in heater and is provided with a resin injection port for press-fitting resin into the cavity 3 by connecting an extruder. .

In the cable connection molding device configured in this way, when pressure is applied to the cable 8 during resin injection, the packing 5 is displaced toward the packing relief portion 10 to relieve this pressure, which is different from the conventional molding device. As a result, there is no discontinuous pressure drop at the end of the mold, and no bulges occur in the cables 3 on both sides of the molding device 2 after resin injection, and a good cable connection can be molded.

[Effects of the invention] As explained above, according to the cable connection molding device of the invention, the pressure applied to the cable during resin injection is relieved at the end, so that the bulge of the cable after resin injection is reduced. It is possible to prevent the occurrence.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the cable connection forming apparatus of the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional cable connection forming apparatus. DESCRIPTION OF SYMBOLS 1... Conductor connection part, 2... Molding device, 3... Cavity, 4... External mold, 5... Heat-resistant rubber packing, 5a... Inner tapered surface, 5b... Outer tapered surface, 5c... Cable insertion hole, 6...
Internal mold, 6a... Inner tapered surface, 7... Annular presser fitting, 8... Cable, 9... Presser tape,
10...Patsuking Escape Club.

Claims (1)

[Scope of utility model registration request] A cylindrical external mold, and a pair of heat-resistant parts inserted into both ends of the external mold, each having a conical inner tapered surface and an outer tapered surface whose diameter decreases toward the terminal side, and having a cable insertion hole in the center. an inner mold having a rubber packing, an inner tapered surface inserted into the outer mold with its inner tapered surface abutting each outer tapered surface of the packing, and a cable insertion hole at the center; In a cable connection forming device comprising an annular presser fitting detachably fixed to the end face of an external mold, a tapered surface that is more gently sloped than the outer tapered surface is formed closer to the cable insertion hole on the inner tapered surface of the internal mold. A cable connection part forming device characterized by forming a packing relief part.