JPH0140275Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a new and useful wire retaining clamp for tension insulators, which is capable of clamping the end of the wire in a live wire state through which current is passed.

Conventionally, various wire retaining clamps have been used for tension-resistant insulators, but with any of these wire retaining clamps, if the wire ends are clamped without removing the covering, they may cause problems such as induction failure. Therefore, the current method is to remove the covering from the ends of the wires before clamping them, and as a result, it is not possible to clamp the ends of the wires while the wires are live and carrying current, and the work must be carried out with the power cut off. There were problems such as what had to be done.

Therefore, the inventor of the present invention proposed a wire retaining clamp for tension-resistant insulators that can clamp the end of the wire while the wire is in a live state, and that does not cause induction disturbances, in Japanese Patent Application No. 58-192745. I suggested it, but
The present invention further improves such a wire retaining clamp, and in particular improves workability during clamping and eliminates work errors.

That is, in order to achieve the above-mentioned object, the present invention breaks the wire sheathing part on the inner surface of a split-cylindrical or cylindrical metal outer shell while the wire end is clamped with this outer shell. A wire retaining clamp is provided with a holding convex piece for holding a wire core portion, and a positioning locking protrusion is provided on the outer periphery of the outer shell to be locked to a die portion of a press tool during compression deformation. Its structural feature is that it is formed into pieces.

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of the embodiment, and FIGS. 2 and 3 are side and bottom views thereof. In these figures, numeral 3 is a split tube-shaped clamp of the present invention made of metal such as iron or copper. This clamp 3 consists of an outer shell 1 with a C-shaped cross section that gradually becomes thicker toward the center from a split opening 4 formed at the bottom, and a mounting piece 2 with a bolt insertion hole 201 bored at one end. are integrally formed. On the inner surface of the outer shell 1 of this clamp 3, a plurality of rib-like holding protrusions 5 each having a substantially C-ring shape are provided at predetermined intervals.

Furthermore, a pair of positioning locking protrusions 6 are provided at both ends of the split opening 4 in correspondence with the holding protrusions 5.

As shown in FIGS. 4 and 5, when the outer shell 1 of the clamp 3 is compressed and deformed by the press tool 8 and the end of the wire 7 is clamped, the holding convex piece 5 closes the wire sheathing portion 71. It penetrates into the outer shell 1 and breaks the sheathing part 71, tightly binding and holding the wire core part 72 from the surroundings, and also serves to prevent induction disturbances by electrically connecting the wire core part 72 and the outer shell 1. However, when the outer shell 1 is compressed and deformed by the press tool 8, the locking protrusion 6 properly locks the outer shell 1 to the die part 81 of the press tool 8 and moves it forward or backward. This effectively prevents displacement in the circumferential direction. Therefore, in this embodiment, during clamping, the holding convex piece 5
In order to completely break the wire core part 72 and to ensure sufficient conduction between the wire core part 72 and the outer shell 1, the cross-sectional shape of the holding convex piece 5 is changed to the sixth shape. The height of the holding convex piece 5 and the outer shell 1 are adjusted so that the tip part has a tapered mountain shape as shown in the figure, and the wire core part 72 can be held with uniform binding force from the surroundings. As shown in FIGS. 4 and 5, the wall thickness is configured to become smaller as it gets closer to the split opening 4, and furthermore, rainwater does not enter into the wire core portion 72 from the fractured portion of the wire sheathing portion 71. like,
Both sides of this holding convex piece 5 are coated with a layer 9 of water repellent material such as a compound as shown in FIG.

Further, the center portion of the positioning locking convex portion 6 provided corresponding to the holding convex piece 5 is hollowed out to form a hollow space 61, and the center portion corresponding to the tip of the holding convex piece 5 is hollowed out.
The tip of the holding convex piece 5 on the opposite side, which was crushed during compression deformation, is used as an escape opening to accommodate the tip.
Such a space 61 is not necessarily necessary.

Note that the holding convex piece may not be formed into a substantially C-ring shape or an O-ring shape in which convex portions are continuously formed as described above, but the convex portion may be formed into a sawtooth shape. Although this is not the case, it would be convenient if the clamp 3 is provided with a hook 10 for attaching a pulley as shown in FIG.

To explain how to use the wire retaining clamp 3 of the present invention having the above-described structure, as shown in FIG. The mounting piece 2 is attached with bolts and nuts, and an insulating rope is wound between a pulley 104 attached to the hook 107 of a simmerer chuck 103 that grips the electric wire 7 and a pulley 105 attached to the hook 10 of the clamp 3. 106 to draw the end of the wire 7 to the clamp 3, and insert the end of the wire 7 into the split opening 4 of the outer shell 1 of the clamp 3, as shown in FIG. While holding it, the outer shell 1 of the clamp 3 is compressed from the periphery using a press tool 8 as shown in FIGS. 4 and 5, and the electric wire 7 is held and fixed so that it cannot come off. Desirably, the clamp 3 is further covered with an insulating cover (not shown), and the inside thereof is filled with a filler such as a compound.

However, during such a compression operation, according to the clamp 3 of the present invention, the positioning locking protrusion 6 provided on the outer shell 1 is inserted into the die portion of the press tool 8 as shown in FIG. Because it can be locked to 81,
The outer shell 1 does not shift back and forth or in the circumferential direction within the die part 81 during compression, and the end of the electric wire 7 can always be clamped in an appropriate state. In addition, in the illustrated example of the clamp 3, the outer shell 1 is formed to become thicker from the split opening 4 toward the center.
In the compression deformation, the closer the part to the split opening 4 is, the easier the bending deformation becomes, and as shown in FIG. bent into such a state.
At this time, the holding convex piece 5 of the clamp 3 breaks the wire sheathing portion 71 and firmly holds the wire core portion 72, so that an extremely large clamping force can be obtained.

In this way, the electric wire 7 can be fixed by the clamp 3 of the present invention.
When the ends of the core wire 72 are clamped, the core wire portion 72 is compressed evenly from its outer peripheral surface, and as a result, the core wires constituting the core wire portion 72 are tightly gathered together with no gaps and are deformed. After this compression, the core portion 7
The current passing area at No. 2 is almost unchanged from before clamping. During clamping, the holding convex piece 5 establishes conduction between the wire core portion 72 and the clamp 3, so that there is almost no induction disturbance.

Moreover, according to the clamp 3 of the present invention, the electric wire 7
Since the sheathing part 71 at the end of the wire can be clamped as it is without peeling off, it is possible to carry out construction work while the wire is still energized, and unlike conventional products, there is no need to cut off the power each time the work is done. You can also get rid of unnecessary hassles.

In addition, when both sides of the holding convex piece 5 are covered with the water-generating material layer 9 as in the embodiment, rainwater can be effectively prevented from entering the wire core portion 72. There is also the advantage that corrosion of the wire 72 and reduction in the tensile strength of the wire 7 can be prevented.

As described above, the clamp of the present invention has a simple structure, has great effects such as being able to securely clamp the wire in a live state, and has a locking protrusion provided on a part of the outer shell. The piece effectively prevents the outer shell from shifting within the die of the press processing machine during compression deformation, so there is no operational error during compression processing, and work errors such as redoing are avoided, significantly increasing work efficiency. This has the advantage that it can be used as a wire clamp for live wire work.

Although not shown in the drawings, as another example of the present invention, the outer shell may be formed into a cylindrical metal sleeve shape, and such a structure also provides the same effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the clamp of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a bottom view thereof, and Figs. 4 and 5 are the state of the clamp when it is compressed and deformed. FIG. 6 is a diagram showing another example of the holding convex piece, and FIGS. 7 and 8 are explanatory diagrams of an example of the use of the present invention. In the explanation of the symbols and figures, 1 is the outer shell, 2 is the mounting piece, 3 is the clamp of the present invention, 4 is the split opening, 5 is the holding convex piece, 6 is the locking piece for positioning, and 8 is the locking piece for positioning. The press tool 81 is a die portion thereof.

Claims (1)

[Scope of claims for utility model registration] (1) On the inner surface of a split tube-shaped or cylindrical metal outer shell,
A wire retaining clamp is provided with a holding convex piece that breaks the wire sheath and holds the wire core part when the wire end is clamped with the outer shell. A wire retaining clamp for a tension-resistant insulator, characterized in that a positioning locking protrusion is formed to be locked to a die portion of a press tool during deformation. (2) The clamp according to claim 1 of the utility model registration claim, in which both sides of the holding convex piece are covered with a water-generating material layer.