JPH0540676Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a cable branch, and more specifically, a cable branch that connects branch cables in the middle of a main cable and integrates them with a resin molded member. This is related to the improvement of

[Conventional technology]

An example of a conventional cable branching section is shown in FIG.
The core is exposed by peeling off the sheath and the intervening cable so that it is divided into the main cable section 10' and the downstream main cable section 10', and the branch cable 20 is attached to the exposed core section.
The exposed core at the terminal is branched and connected. That is, the main cable is spaced apart and faces each other at the cut ends of the upstream and downstream main cable parts 10, 10' with the intervening parts 13, 13' and the sheaths 14, 14'. The cores 11 and 12 and the cores 11' and 12' of the downstream main cable section 10' are exposed, and the cores 11 and 12 are exposed.
1', core wires 11a, 11a' are exposed between each other.
Also, between core wires 12a and 12',
a′ is exposed. In addition, branch cable 20
At the end, the sheath 24 and the interposer 23 are peeled off to expose the cores 21 and 22, and the core wires 21a and 22a are exposed.

The core wire 21a of the branch cable 20 is connected to the conductor connection sleeve 3 to the core wires 11a, 11a' of both the upstream and downstream trunk cable sections 10, 10' exposed as described above.
1, and the core wires 12a,
A core wire 22a is electrically branched and connected to 12a' by a conductor connection sleeve 32. Then, a resin molding member 33 made of vinyl chloride resin or the like is integrally applied over the sheaths 14, 14' of the main cable parts facing each other and the sheath 24 of the branch cable, thereby forming the cable branch part 30. be done.

[Problem that the invention attempts to solve]

According to the cable branch section 30 as shown in FIG. 2, if a large tension is applied to the main cable or the branch cable during installation work, there is a risk that the core may break. This will be explained by taking as an example a case where excessive tension is applied to the upstream trunk cable section 10. That is, normally, as shown in FIG.
However, if excessive tension is applied to the upstream trunk cable section 10, the cut end of the sheath 14 will break out of the resin, as shown in FIG. Since it is firmly fixed by the mold member 33, an elongation corresponding to the tension is applied from the fixed part to the part on the cable main body side (the left side in FIG. 4). Then, the inside of the sheath 14 to which the cut end is fixed is inserted between the intervening part 13 and the core 1.
1 and 12 are pulled in a sliding state. At this time,
Since the core wires 11a and 12a are firmly fixed by the conductor connection sleeves 31 and 32 that are integrated into the resin molded member 33, the interposer 13 can be moved toward the cable body (left side in FIG. 4). Become. As a result, as shown by arrows a and b,
The cores 11 and 12 are subjected to excessive tensile force and break.

The above-mentioned rupture accident occurred at the downstream trunk cable section 10'.
The same problem may occur in the branch cable 20, and especially in cables with a small core conductor cross-sectional area, breakage may occur at a tensile strength that is less than a fraction of the tensile strength of the cable itself. In this case, between the upstream and downstream trunk cable sections 10 and 10', the interposers 13 and 13' are separated from each other at the cut ends, and the interposer 23 of the branch cable 20 is also separated and each is made of a resin molded member. Since there are few parts integrated with the sheath 1, when excessive tension is applied to the cable as described above, the intervening parts 13, 13', and 23
4, 14', and 24, and the tensile strength of the intervening portion does not contribute to relieving the tension of the cable.

Therefore, in order to solve the above-mentioned problems, the present invention aims to provide a highly reliable cable branch part that has improved tensile strength and is less prone to breakage accidents.

[Means for solving problems]

The cable branch section provided by the present invention is a cable branch section in which a branch cable having a sheath, a core, and an intervening part is branched and connected in the middle of a main cable having a core, a sheath, and an intervening part, and is integrated with a resin molded member. , The exposed interposition between the cut ends of the sheath of the main cable is not cut at all, and the exposed interposition at the end of the branch cable is integrally fixed to the same interposition left as it is, and the above main cable is exposed. The present invention is characterized in that an uncut interposition, an exposed interposition of the branch cable, and an integrally fixed part of the interposition are embedded and integrated into a resin molded member.

〔Example〕

FIG. 1 shows an embodiment of the cable branch section according to the present invention.

The main cable provided with the cable branch part 60 is continuous with the upstream main cable part 40 and the downstream main cable part 40', and in each cable part, the intervening 42, 42' and a core (not shown). Furthermore, an interposer 52 and a core (not shown) are provided inside the sheath 51 of the branch cable 50.

Both upstream and downstream main cables 40, 40' are
The cut ends of the sheaths 41, 41' are spaced apart and face each other, so that the intervening parts 42, 42' are exposed;
As a result, the core (not shown) is also released from the sheath. Therefore, the core between both the upstream and downstream trunk cable sections is exposed by appropriately pulling together the interposers 42 and 42', and then the exposed core (not shown) at the end of the branch cable 50 is removed as before. Electrical branch connections are made using similar means.
Then, the intervention 42, 42' that has been brought together is
As shown in the figure, it is restored to its original state and left intact as a continuous piece without cutting it at all. For the interventions 42, 42' left as they are,
The end of the branch cable 50 is attached with an exposed intervening part 52 and is tied and fixed together with a bind wire 61.

Note that instead of the binding wire 61, they may be fixed together by adhesive or thermal fusion.

A resin molded member 62 is integrally provided around the connection part as described above, and the sheaths 41, 41' of both the upstream and downstream cable parts and the sheath 51 of the branch cable are integrated with each other,
The exposed uncut inserts 42, 42', the exposed insert 52, and the integral fixing portions of these inserts are embedded in the resin mold member and firmly integrated.

In the cable branch section having the above-described structure, if excessive tension is applied to one or both of the upstream side and downstream side of the main cable, the sheaths 41, 41 whose cut ends are firmly fixed by the resin molded member 62 ′ will be subjected to tension. Along with this, tension is also applied to the intervening parts 42 and 42',
Since the exposed portion between the cut ends of the sheaths 41 and 41' remains as it is without being cut at all, the intervening portions 42 and 42' are connected from the upstream trunk cable section 40 to the downstream trunk cable section 40'. The tension is borne by the interposers 42, 42' which are not cut at all, and the exposed uncut portions of the interposers 42, 42' are embedded in the resin molded member 62 and cannot move. Therefore, the core released from the sheath and its connecting portion can be stably provided in the resin molded member 62 without movement, so that the tension load on the core is almost absent or greatly reduced.

Furthermore, if excessive tension is applied to the branch cable 50, tension will be applied to the sheath 51 whose cut end is firmly fixed by a resin molded member. Along with this, tension is also applied to the interposer 52, but the interposer 52 has an exposed portion exposed from the cut end of the sheath 51 embedded in the resin mold member 62, and an exposed uncut portion. Since it is integrally fixed to the interposers 42 and 42, and the integrally fixed part is also embedded and integrated in the resin mold member, the end of the core released from the sheath 51 and the connecting part thereof can be inserted into the resin mold member 62. Since it is stably installed without moving, the tension is borne by the interposition 52, and the tension load on the core is almost non-existent or greatly reduced.

In addition, in the above embodiment, in the main cable, even if the core wire of the branch cable is branched and connected to the exposed core wire portion without cutting the core of the portion that has been peeled off and removed midway, the core wire portion of the trunk side will be completely disconnected. It is also possible to cut them into two and connect them with a conductor connection sleeve. The latter case is possible because the tension is borne by the uncut intervention and no tension is applied to the core or core wire.

[Functions and effects of the idea]

According to the cable branch part of the present invention as described above, the intended purpose of providing a highly reliable cable branch part that is less likely to cause disconnection accidents due to improved tensile strength of the branch part can be sufficiently achieved. will be achieved.

Incidentally, in the case of a two-core cable with a rated voltage of 600V and a control vinyl insulated vinyl sheathed cable with a conductor cross-sectional area of 0.9｜, the conductor core wire will break at a tension of approximately 50 to 60 kg using a conventional cable branch. However, it has been confirmed that the cable branch of the present invention has the strength to withstand approximately three times the tension of the conventional cable branch. This value is comparable to the tensile strength of the cable itself.

This technical achievement is due to the following actions. In other words, if excessive tension is applied to the main cable, tension will be applied to the sheath whose cut end is firmly fixed by the resin molded member, and along with this, tension will also be applied to the intervening cable. , since the exposed portion of the sheath between the cut ends of the sheath remains completely uncut, the intervention bears tension over the entire length of the main cable due to the uncut intervention; The exposed uncut portion of the same intervening part is embedded and integrated into the resin mold member and does not move, so the core released from the sheath and its connection part can be stably inserted into the resin mold member without moving. Thus, the tension load on the core is almost absent or greatly reduced.

Furthermore, if excessive tension is applied to the branch cable, tension will be applied to the sheath whose cut end is firmly fixed by the resin molded member, and along with this, tension will also be applied to the intervening cable. The exposed portion of the sheath from the cut end of the sheath is embedded and integrated into the resin molded member, and is also integrally fixed to the exposed uncut portion, and the integrally fixed portion is also embedded within the resin molded member. Since the end of the core released from the sheath and its connection part are stably installed in the resin molded member without movement, the intervening part bears the tension and does not burden the core with tension. There will be almost no or greatly reduced Therefore, the results described above are achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional explanatory diagram showing an embodiment of a cable branch according to the present invention, FIG. 2 is a partially cross-sectional explanatory diagram showing an example of a conventional cable branch, and FIGS. 3 and 4 are FIG. 2 is a cross-sectional explanatory diagram for explaining problems with a conventional cable branch section. 40, 40'... Trunk cable section, 41, 4
1', 51... Sheath, 42, 42', 52... Interposition, 50... Branch cable portion, 61... Bind wire, 62... Resin molded member.

Claims (1)

[Scope of Claim for Utility Model Registration] A branch cable having a sheath, a core, and an intervening part is branched and connected in the middle of a main cable having a core, a sheath, and an intervening part, and the above main cable is integrated with a resin molded member at the cable branch part. The exposed intermediate between the cut ends of the sheath is not cut at all, and the exposed intermediate at the end of the branch cable is integrally fixed to the same intermediate that is left as is, and the exposed uncut intermediate of the main cable is A cable branch section characterized in that a bare intervening part of the branch cable and an integral fixing part of the intervening part are embedded and integrated into a resin molded member.