JPH0121493Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a grounding structure for a power cable having a copper wire braid as an external shielding layer, such as an emergency cable.

[Technical background of the invention] Emergency cables are stretched and wound around cable drums relatively frequently, so they are bent many times and are therefore required to be more flexible than ordinary cables.

Therefore, the diameter of the conductor of an emergency cable is generally smaller than that of a normal cable, and its outer shielding layer is made of a copper wire braid instead of a copper tape.

Therefore, in a cable having an external shielding layer, it is necessary to ground the shielding layer, and conventionally, a grounding structure shown in FIG. 1 has been used.

That is, in the same figure, the outer semiconducting layer 2 on the cable insulator 1 at the cable terminal part, the copper wire braid 3 serving as the outer shielding layer, the cable sheath 4, etc. are successively stripped off, and the end of the copper wire braid 3 is removed. The copper wire 5 wound around it is folded back, further tied up with the copper wire 6, and the copper wire 6 is directly attached to the cable sheath 4.
Either the copper wire 7 is extended upward and used as a grounding wire, or the copper wire 7 is separately wound on the copper wire braid 3 and used as a grounding wire. In addition, the reference numeral 8 in the figure is a protective tape wrapping layer for preventing moisture from entering between the cable sheath 4 and the copper wire braid 3.

[Background Art Interval Points] However, in the above-mentioned conventional grounding structure, the copper wire 6 or 7 serving as the grounding wire is connected to the copper wire braid 3.
In order to make sure that they are in contact with each other, they are properly soldered, but the flux used during this soldering flows between the strands of the copper wire braid 3 due to capillary action. However, unless the lever flux is carefully removed, the copper wires 6 or 7 will corrode, and especially in the case of a copper wire braid with a small wire diameter, there is a risk that the wire will break, resulting in incomplete grounding of the external shielding layer.

[Purpose of the invention] The present invention was developed based on the above circumstances, and is intended to provide a grounding structure for power cables that does not require soldering, which causes corrosion of the copper wire braid, and is free from the risk of disconnection of the copper wire braid. The purpose is to provide.

[Summary of the invention] According to the invention, in a power cable grounding structure in which a ground metal body is electrically connected to a cable shielding layer made of a copper wire braid, the ends of the copper wire braid are unwound and folded, and the cable sheath is Crimp and fasten it to the crimp terminal provided at one end of the ground metal body along the top,
The above object is achieved by tying the circumference of the folded portion of the copper wire braid with a bind wire and further providing a protective tape wrapping layer on the outer periphery of the copper wire braid and the crimp terminal.

[Embodiments of the invention] The invention will be described below with reference to embodiments shown in the drawings.

Fig. 2 shows one embodiment of the present invention, and Fig. 3 shows an embodiment of the present invention.
The figure and FIG. 4 show the assembly process of the same embodiment. In these figures, parts common to those in FIG. 1 are given the same reference numerals.

In FIG. 2, the copper wire braid 3, cable sheath 4, etc. are sequentially stripped off from the outer semiconducting layer at the cable terminal, and the end of the copper wire braid 3 is folded back from the copper wire 5 wound around it. This is the same as in the case of FIG. In this embodiment, the ends of the copper wire braid 3 are unwound, folded back and bundled into one bundle, which is crimped and fastened to a crimp terminal 10 at one end of the ground metal body 9. etc. binding line 11
He is tied up.

The crimp terminal 10 is attached in advance to one end of the ground metal body 9 with something like a rivet 12, and the end of the copper wire braid 3 is fastened only by crimp. The grounding structure of this example is shown in Figs. 3 and 4.
It is assembled through the process shown in the figure.

In Fig. 3, first, the copper wire 5 is wound around a predetermined position to tighten the outer periphery of the copper wire braid 3, and then the braid at the end of the copper wire braid on the left side of the figure is unbraided from the copper wire 5, and each strand is Straighten 3a.

Next, as shown in FIG. 4, each strand 3a is folded back toward the cable sheath 4 side, and the circumference near the copper wire 5 is tied tightly with a bind wire 11.

Thereafter, as shown in FIG. 2, the wires 3a are bundled together so that they can be inserted into the crimp terminals 10 of the copper wire braid 9, and the excess is cut off and crimped. This assembly is completed by placing the ground metal body 9 along the cable sheath 4 and providing the protective tape wrapping layer 8.

Figures 5 and 6 show other embodiments of the invention. This embodiment is advantageous when the outer diameter of the outer shielding layer is large and therefore the number of strands of the copper wire braid is large and cannot be inserted into one crimp terminal.

That is, as shown in FIG.
is T-shaped, and two or more crimp terminals 14 are fixed to one piece 13a of the T-shape using rivets 15 or the like. Then, as shown in FIG. 6, the copper wire braid 3 is divided and crimped onto the crimp terminal 14, and one piece 13a of the ground metal body 13 is curved along the outer periphery of the cable sheath 4. The other configurations are the same as in FIG. 2.

[Effects of the invention] As described above, according to the invention, in the grounding structure of a power cable using a copper wire braid as a cable shielding layer, no soldering is required to connect the copper wire braid and the ground metal body. Since it is not used, there is no risk of the copper wire braid being corroded or disconnected due to flux, and a stable grounding function can be achieved.

Further, since the copper wire braid of the grounding structure is not exposed, electric shock and leakage are prevented, and moisture does not enter between the cable sheath and the conductor braid.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing the grounding structure of a conventional power cable, Fig. 2 is a partially longitudinal front view showing an embodiment of the present invention, and Figs. 3 and 4 are the assembly of the same embodiment. FIG. 5 is a front view showing the process, FIG. 5 is a perspective view showing some parts of another embodiment of the present invention, and FIG. 6 is a partially longitudinal front view showing the same embodiment. 3... Copper wire braid, 4... Cable sheath, 9...
...Ground metal body, 10...Crimp terminal, 11...Binding wire.

Claims (1)

[Scope of utility model registration request] In a power cable grounding structure in which a grounding metal body is connected to a cable shielding layer made of a copper wire braid, the end of the copper wire braid is unwound and folded back, and a crimp terminal is provided at one end of the ground metal body along the cable sheath. A power cable characterized in that the copper wire braid is crimped and fastened, the circumference of the folded portion of the copper wire braid is bound with a bind wire, and a protective tape wrapping layer is provided on the outer periphery of the copper wire braid and the crimp terminal. grounding structure.