JPH04201632A - Grounding device - Google Patents

Abstract

PURPOSE:To prevent the individual difference of the pressing force and the loosening of screws in a grounding device for a train line at maintenance inspection by nipping the bottom side of a rail by a pair of hook bolts and a nipping metal fitting having a shoulder bolt having a spring, and tightening a nut on the shoulder bolt through the hook bolt and a spring receiving metal fitting into which the shoulder bolt is insetted. CONSTITUTION:Both the bottom side edges are nipped from below the bottom side of a rail R by hook bolts 1 and 1 and a nipping metal fitting 2. A shoulder bolt 3 and the hook bolt 1 are inserted into the hole on a spring receiving plate 5, and a nut 7 is screwed on the shoulder bolt 3. Accordingly, a spring 8 is compressed, and the spring receiving plate 5 and the stage part of the shoulder bolt 3 contact. Then, each butterfly nut 6, 6 of each hook bolt 1, 1 is uniformly screwed. A snap pin insertion hole is drilled before the spring receiving plate 5 of each hook bolt 1, 1, and a pin is inserted after the butterfly nut 6 passes through the pin insertion hole, and the loosening of the butterfly nut 6 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a grounding device for grounding feeder lines or overhead contact lines for safety during repair and inspection of conductive wire bodies such as overhead contact lines.

[Conventional technology] When inspecting and repairing overhead contact lines, the power to the section is cut off and this is confirmed before work begins, but even in that case, to ensure safety, conductive wires must be grounded. It is necessary.

That is, an insulating rod B (FIG. 4) having a hook fitting H at its tip is used, the hook is hooked onto the electric wire, and the lead wire hanging from the hook fitting is connected to the grounding device. As shown in Fig. 5, the grounding device is constructed by hooking a hook bolt 1 onto one edge of the bottom of the rail, passing the leg of the bolt 1 through a clamp C with a U-shaped cross section attached to the other edge of the bottom, and then tightening the bolt 1 with a nut. It is designed to be tightened with N.

Although this structure is easy to attach and detach from the rail, it is difficult to avoid loosening of the nut due to vibration of the rail, it does not necessarily provide a reliable grounding effect, and there are also individual differences in the tightening pressure of the nut. Ta.

[Means for solving problem W] The pressure for clamping the rail is obtained by a spring rather than by tightening a nut on the hook bolt 1. For this purpose, a zero stage is provided in which a spring, a spring receiving plate, and a stepped bolt are provided. Tighten the spring to a certain limit using the hexagonal nut of the attached bolt through the spring receiving plate. The hook bolt also passes through the spring receiving plate, and the nut screwed into it is adjusted to prevent it from rotating in a predetermined position. After this, loosen the hexagonal nut on the stepped bolt and allow the spring pressure to be supported by the hook bolt. The rail is always clamped with a constant spring pressure, and that pressure does not change.

[The drawings of the embodiment will be explained. The two parallel hook bolts 1 are
After engaging with one end edge of the rail R, it extends so as to be in close contact with the bottom side of the rail. The clamping fitting 2 has a U-shaped cross section and is capable of engaging with the other end edge of the rail, and has a hole through which the hook bolt 1 that is in close contact with the bottom side is bored. One end thereof is inserted into a hole drilled in the front surface of the clamping fixture, and is locked to the clamping fixture by a pin 4 passing through the hole at right angles. Further, the other end forms a small diameter threaded frame portion 3a. A hook bolt 1 and a screw frame part 3 are attached to the spring receiving plate 5.
A hole corresponding to ``a'' is bored, and the hook bolt 1 passing through the hole is screwed with a hinge, and the J-shaped frame 3a is screwed with a hexagonal nut 7, respectively. The spring 8 is inserted into the stepped bolt 3 between the clamping fitting 2 and the spring receiving plate 5. Clamping fittings 2
The lower end of the lead wire hanging down from the tip of the insulating rod B is fixed with a bolt 9.

[Operation] The nine-stage bolt 3, which holds the bottom of the rail between the hook bolt 1 and the clamping fitting 2, is locked at one end to the clamping fitting 2, and a spring 8 is fitted around the outer periphery. Insert the ends of the hook bolt 1 and shoulder bolt 3 into the holes of the spring receiving plate 5, and tighten the wing nuts 6, respectively.
and hexagonal nut 7. Tighten hexagonal nut 7,
The spring receiving plate and the stepped portion of the stepped bolt are brought into contact. 1.2
The figure shows the situation at this time.

Next, feed the left and right wing nuts 6 evenly. A diametrical hole 1a is pre-drilled in the two hook bolts at an appropriate position in front of the spring receiving plate 5, and when the wing nut 6 passes through this hole, the monopod of the pine needle pin 10 is inserted into this hole. do. This bottle is used to prevent the wing nut from loosening, and in this case, the powder pin is convenient for attaching and detaching.

Loosen the hexagonal nut 7 and support the spring force with the left and right hook bolts. After this, the hexagonal nut 7 may be removed. Since the wing nut is moved after tightening with the hexagonal nut, positioning of the wing nut and insertion of the pine needle pin are easy.

[Effect] Since the clamping metal fittings are pressed by the spring force applied equally to the left and right hook bolts, there are no individual differences in the pressing force.

Since there is a pine needle pin, the screw does not loosen, the clamping pressure is always constant, and a stable grounding effect can be obtained.

[Brief explanation of the drawing]

Figure 1 is a front view of the present invention, Figure 2 is a plan view of the same, Figure 3 is an explanatory diagram of a pine needle bottle, Figure 4 is a front view of an insulating rod, and Figure 5 is an explanatory diagram of a conventional grounding device. be. 1-hook bolt, 2-clamping fitting, 3-stepped bolt, 4
- Bottle, 5 - Spring receiving plate, 6 - Wing nut, 7 - Hexagonal nut, 8 - Spring, 9 - Bolt, 10 - Pine needle pin, B - Insulating rod, H - Hook fitting, L - Lead wire. Patent applicant: Sanwa Tech Co., Ltd. Figure 4 Figure 3

Claims (1)

[Claims] two hook bolts extending in parallel to engage with one end edge of the rail bottom so as to be able to come into close contact with the bottom side; and a clamping fixture with a U-shaped cross section that can engage the other end edge of the rail bottom and has a through hole for the hook bolts. , a stepped bolt whose one end is inserted and locked into the center of the back of the clamping fitting and whose other end is a stepped small-diameter threaded portion; a spring receiving plate having a through-hole corresponding to the hook bolt and the small-diameter portion of the stepped bolt; The spring inserted between the clamping metal fitting and the spring receiving plate, the hexagonal nut that can be screwed together with a stepped bolt to tighten the spring receiving plate to the stepped part, and the hook bolt that can be screwed together to lock the spring receiving plate in a fixed position. A grounding device consisting of a wing nut and a lead wire end from a grounding hook connected to the clamping fitting.