JP3011999B2 - Grounding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [Field of Industrial Application] The present invention relates to a grounding device for grounding an electric wire or an electric wire for safety at the time of repair and inspection of a conductive wire such as an electric wire.

[Prior art] In the repair and inspection of the trolley line, the power supply in that section is cut off and the work is performed after confirming this, but even in that case, the conductive wire body should be grounded to ensure safety. is necessary. That is, the insulating rod B (the fourth
The hook is hooked on the electric wire, and the lead wire L hanging from the hook fitting is connected to the grounding device using FIG. As shown in FIG. 5, a grounding device is provided with a hook bolt 1
And a leg of the bolt 1 is passed through a holding member C having a U-shaped cross section applied to the other edge of the bottom side, and this is tightened with a nut N.

Although this structure can be easily attached to and detached from the rail, loosening of the nut due to vibration of the rail is difficult to avoid, and does not always fulfill a reliable grounding action. Another problem was that there were individual differences in nut tightening pressure.

[Means for Solving the Problems] The pressure for clamping the rail is obtained not by tightening the nut on the hook bolt 1 but by a spring. For this purpose, a spring, a spring receiving plate and a stepped bolt are prepared. Tighten the spring to a certain limit via the spring receiving plate with the hexagon nut of the stepped bolt. The hook bolt also penetrates the spring receiving plate, adjusts a nut screwed to the spring receiving plate, and locks it at a predetermined position.
Then, loosen the hexagon nut of the stepped bolt and support the spring pressure with the hook bolt. The rail is always clamped by a constant spring pressure, and the pressure does not change.

Example A drawing will be described. Two parallel hook bolts 1
After engaging with one edge of the rail R, it extends so as to be in close contact with the bottom of the rail. The clamp 2 has a U-shaped cross section, is engageable with the other end of the rail, and has a hole through which the hook bolt 1 that is in close contact with the bottom can pass. The stepped bolt 3 has a large-diameter stepped portion at the center and is inserted at one end into a hole formed in the back surface of the clamp, and is locked to the clamp by a pin 4 penetrating the hole at a right angle. The other end is a small diameter screw rod 3a
To form Hook bolt 1 and screw rod part
A hole corresponding to 3a is drilled, and a wing nut 6 is screwed into the hook bolt 1 penetrating therethrough, and a hex nut 7 is screwed into the threaded rod portion 3a. The spring 8 is inserted into the stepped bolt 3 between the clamp 2 and the spring receiving plate 5. In the clamp 2
The lower end of the lead wire L hanging down from the tip of the insulating rod B is fixed with a bolt 9.

[Operation] The bottom of the rail is clamped between the hook bolt 1 and the clamp 2. One end of the stepped bolt 3 is locked to the holding fitting 2, and a spring 8 is fitted on the outer periphery. Hook bolt 1 and stepped bolt 3
Are inserted into the holes of the spring receiving plate 5, and the wing nut 6 and the hex nut 7 are screwed respectively. Tighten the hex nut 7 to bring the spring receiving plate into contact with the step of the stepped bolt. First
FIG. 2 shows the state at this time.

Next, the left and right wing nuts 6 are evenly fed. The two hook bolts have a diametrical hole 1a in advance at an appropriate position before the spring receiving plate 5, and when the wing nut 6 passes therethrough, insert a leg of the pine needle pin 10 into this hole. I do. This pin is used to prevent the wing nut from loosening, and in this case, the pine needle pin is convenient for attachment and detachment. Loosen the hexagon nut 7 and support the spring force with the left and right hook bolts. Thereafter, the hexagon nut 7 may be removed. Since the wing nut is moved after tightening with the hex nut, positioning of the wing nut and insertion of the pine needle are easy.

[Effect] Since the holding metal is pressed by the spring force equally applied to the left and right hook bolts, there is no individual difference in the pressing force. Since there are pine needles, the screws do not loosen, the clamping pressure is always constant, and a stable grounding effect can be obtained.

[Brief description of the drawings]

1 is a front view of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an explanatory view of a pine needle, FIG. 4 is a front view of an insulating rod, and FIG. 5 is an explanatory view of a conventional grounding device. is there. DESCRIPTION OF SYMBOLS 1 ... Hook bolt, 2 ... Clamping fitting, 3 ... Stepped bolt, 4 ... Pin, 5 ... Spring receiving plate, 6 ... Wing nut, 7
... Hex nut, 8 ... Spring, 9 ... Bolt, 10 ... Matsuba pin, B ... Insulating rod, H ... Hook fitting, L ... Lead wire.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60M 1/28 H01R 4/64

Claims (1)

(57) [Claims] 1. A cross-section comprising two parallel hook bolts which are engaged with one end of the bottom of the rail and extend so as to be in close contact with the bottom, and a through-hole of the hook bolt which is engageable with the other end of the bottom of the rail. And a stepped bolt, one end of which is inserted and locked at the center of the back of the clamp, and the other end is a small stepped screw thread.
A spring receiving plate having a through hole corresponding to the hook bolt and the small diameter portion of the stepped bolt, a spring inserted between the holding metal fitting and the spring receiving plate, and screwing the stepped bolt to tighten the spring receiving plate to the stepped portion. A hexagonal nut that can be used, a wing nut that can be screwed into a hook bolt to lock the spring receiving plate in place, and an arm lead wire with one end connected to the clamp, and the spring receiving plate is temporarily A grounding device, wherein the temporary tightening of the spring receiving plate is released after tightening and freely locking the wing nut in the set position.