JPH0419772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a connection device for earth bond wires in a cable rack.

[Background technology]

The cable racks may be connected in a straight line, as shown in FIG. 4, or in a manner that they cross each other at an angle, as shown in FIG. In the former case, since the integral connecting fitting 1 is tightened by the bolts and nuts that are the fittings 2, the electrical connection state between the master girders 3 connected to each other is almost stable, and the electrical connection is particularly stable. It is safe even if you do not rely on reliable connection methods. On the other hand, in the latter case, as shown in FIG. This is dangerous because the electrical connection becomes unstable at the location of the hinge 5.

Therefore, in the past, holes 6, 6 for the ground terminal were provided in the connection pieces 4, 4, and the ground bond wire 7 was placed between these, as shown in FIG. The above-mentioned dangers have been prevented and safety has been ensured.
However, the ground terminal holes 6, 6 are specially provided as completely different holes from the fitting insertion hole 8 for attaching the connection fitting 1, and as shown in FIG. Dedicated bolt 9 and nuts 10 for connecting the earth bond wire 7
As a result, it is necessary to separately process and provide the hole 6 for the earth terminal, which not only makes manufacturing the connecting fitting 1 troublesome, but also requires special bolts 9, nuts 10, and rotation prevention means 11. Many special parts such as these are required, which increases production costs.Furthermore, it is necessary to install the earth bond wire 7 separately from the installation of the connection fitting 1, which makes it difficult to improve the efficiency of construction. But now there's one thing that struck me. In particular, the dedicated bolts 9 and the like are all attached to the connecting fitting 1 before being attached to the main girder 3, but when passing the dedicated bolt 9 through the main girder 3 and the connecting fitting 1, it is necessary to use a nut 10 or a rotation prevention means. It is necessary to disassemble everything such as 11 and reassemble it. This made construction work extremely time-consuming.

[Purpose of the invention]

In view of the above-mentioned inconveniences, the present invention eliminates the need for a dedicated hole or fixture for attaching the ground terminal, making it easier to manufacture and expected to improve construction (laying) efficiency. The object of the present invention is to provide a connection device for earth bond wires in cable racks.

[Disclosure of the invention]

In order to achieve the above object, in the cable rack earth bond connection device according to the present invention, the main girders of adjacent cable racks are connected to each other via a connecting fitting, and the connecting fitting has two connecting pieces connected to a hinge. Each connecting piece is fixed to each main girder by a bolt and nut, and a male terminal of an earth bond wire is attached to at least one connecting piece of the connecting fittings. In the device for connecting an earth bond wire in a cable rack, the male terminal is fastened together with the parent girder and the connecting fitting by the bolt and nut.

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments thereof.

FIG. 1 shows an example of a connection device for earth bond wires in a cable rack according to the present invention, viewed diagonally from above. A connecting fitting 1 consisting of an intermediate hinge 5 and a pair of connecting pieces 4, 4 is connected between the main girders 3, 3 of the cable rack 12 by a plurality of fittings 2.
As shown in FIG. 2, a rectangular fitting fitting hole 13 is formed penetratingly on the center line of the end of each main girder 3. As shown in FIG. On the center line of each connecting piece 4, 4 of the connecting fitting 1, a strip-shaped fitting insertion hole 8, 8 is formed to penetrate. The fixture 2 is a square root round head bolt with a square root, and is attached to the main girder 3.
It is inserted either inside or outside. In this fixture 2, the connecting fitting 1 is fixed to the main girder 3 side by screwing a tightening nut 14 integrally provided with a nut seat 23 from the outside of the connecting fitting 1. In the embodiment, the connecting fitting 1 is fixed by two fittings 2 and a tightening nut 14 for each connecting piece 4. Of these fittings 2 and tightening nuts 14, the male terminal 15 for the earth bond wire (including the grounding wire) 7 is tightened together using the pair located far from the hinge 5 in the connecting fitting 1. It's getting old. As shown in Figure 1, the male terminal 15 is
Connection washer part 1 equipped with a square fitting through hole 16
7 and a fitting protrusion 19 connected to the male terminal 18 of the earth bond wire 7, and is shaped like a bow. As shown in FIG. 2, the inner periphery of the fixture passage hole 16 has an L-shaped shape that fits into the fixture insertion hole 8 and is prevented from rotating by the parallel inner side of the hole 8. The anti-rotation protrusion 20 is integrally formed parallel to the center line of the fixture through hole 16. The fitting protrusion 19 is integrally provided with the connection washer 17 via a stepped portion 21 . In such a male terminal 15, the fitting 2 is passed from the main girder 3 to the connecting fitting 1 and inserted through the fitting through hole 16 into the screw shaft portion which projects outward. While fitting into the square root portion 22, the anti-rotation protrusion 20 is set against the inside of the fitting insertion hole 8 so as to prevent rotation. In this case, as shown in FIG. 1, the fitting protrusions 19 are both oriented upward, but except for the downward direction where the female terminal 18 easily comes out, they may also be oriented in other directions including the horizontal direction. Can be set. The tightening nut 14 is screwed into the fitting 2 from the outside, and its nut seat 23 allows the male terminal 15 to be attached to the connecting fitting 1.
It is designed to be tightened and fixed together. Female terminals 18, 18 provided at each end of the earth bond wire 7 are connected to the two male terminals 15, 15 by caulking.

In the connection device for the earth bond wire in the cable rack having the above-mentioned configuration, the male terminal 15 is fastened together using the fitting 2 for attaching the connection fitting 1. Thus, there is no need to separately form a hole for the ground terminal, and furthermore, there is no need for any mounting bolts or nuts for mounting the terminal. In addition, since the male terminal 15 can be attached at the same time as the connecting fitting 1, the construction work is greatly streamlined. Conventionally, special bolts 9 and nuts 10 have been made of brass material, which is expensive, but in this invention, the male terminal 15 can be attached using the fitting 2 for attaching the connecting fitting 1. , it was decided to make it cheaper.

In the above embodiment, the fitting through hole 16 of the male terminal 15 is a square hole, but as shown in FIG. 3, it may be a simple round hole type. The fitting protrusion 19 of the male terminal 15 may be like a pin. In this case, the female terminal 18 side is also made cylindrical. Although the fitting fitting hole 13 is square in shape, it may be round.

〔Effect of the invention〕

As explained above, since the earth bond connection device in the cable rack according to the present invention is configured as described above, there is no need for any special holes or fittings for attaching the earth terminal. As a result, it is expected to be easier to manufacture and to improve construction (laying) efficiency.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the earth bond wire connection device in the cable rack according to the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is another example of the male terminal. Fig. 4 is a perspective view showing an example in which the main girders are connected in a straight line, Fig. 5 is a perspective view of a cable rack showing an example of the conventional cable rack, and Fig. 6 is shown in Fig. 5. FIG. 7, which is an enlarged view of the connecting fitting, is a sectional view showing an example of attaching a conventional earth bond wire. 1...Connection fittings, 2...Mounting fittings, 3...Main girders,
4... Connection piece, 5... Hinge, 7... Earth bond wire, 12... Cable rack, 15... Male terminal.

Claims (1)

[Scope of Claims] 1. The main girders of adjacent cable racks are connected to each other via a connecting fitting, and the connecting fitting is formed by connecting two connecting pieces so that they can be bent to each other via a hinge, and each connecting piece is connected to each other via a connecting fitting. An earth bond in a cable rack, in which a piece is fixed to each main girder with a bolt and nut, and a male terminal of an earth bond wire is connected to at least one connection piece of the connection fitting. 1. A ground bond connection device for a cable rack, characterized in that the male terminal is fastened together with the main girder and the connection fittings by the bolts and nuts. 2. The male terminal has a connection washer with a fitting through hole and a fitting protrusion that is connected to the male terminal of the earth bond wire, and the fitting is attached to the inner periphery of the fitting through hole. A locking protrusion that faces parallel to the hole center line of the through hole is integrally formed, and when the locking protrusion is stopped in the mounting tool insertion hole provided on the connection fitting, 2. A connection device for an earth bond in a cable rack according to claim 1, which is adapted to engage.