JPS6118590Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the lead wire portion of a pole-mounted switch, and particularly relates to a structure that improves the contact (connection) between the center conductor penetrating the bushing and the conductive metal fitting.

Conventionally, the lead wire portion of this type of pole switch has been connected to an external electric wire 100 as shown in FIG. 11, for example.
This is a current path that flows to the fixed electrode via - connection pipe 101 - center conductor 102 - tightening nut 103 - conductive metal fitting 104. In this case, since the center conductor 102 and the conductive metal fitting 104 are connected via a tightening nut, if the connection between them is not made tightly and the passing current increases, the current flow will be insufficient and heat-up cannot be avoided. This may lead to accidents such as burnout and oxidation of conductive parts.

The purpose of this proposal is to eliminate the heat-up phenomenon caused by the above-mentioned screw connection, and its structure is such that the bolt part of the center conductor inserted through the through hole in the center of the bushing is inserted into the mounting hole of the support base fixed to the inner stage. Screw together to make the tip protrude, and the protruding bolt part is fitted with a mounting hole of a tapered conductive metal fitting that narrows in the tightening direction, and a tightening nut is fitted in the gap between the bolt part and the conductive metal fitting. This is characterized in that an intervening piece is inserted so as to be pushed into the same gap by tightening to tightly connect (contact) the two.

An embodiment of the present invention will be described below. Reference numeral 1 denotes a porcelain bushing, to which a stress cone type external electric wire 2 is adhered. 3 is external electric wire 2
The core wire 2a is crimped and connected to one end of the central conductor.
A bolt portion 3a, a non-threaded portion 3b, and a second threaded portion into which the nut 9 is screwed are sequentially provided on the distal end side. Reference numeral 4 denotes a support base on which a fixed leg 4a is inserted into the engagement hole 1a in the inner stage of the bushing and fixed with an adhesive 5, and the first bolt part 3a of the center conductor is screwed into the screw hole 4b. This is supported.
Reference numeral 6 denotes a conductive metal fitting, which is held in a hand by fitting into a fitting groove 4c consisting of two protrusions 4c, 4c provided in parallel with an interval on the surface of the support base 4, and is held on the tip side of the center conductor. It has a tapered mounting hole 6a that is widened to the center, and the unthreaded portion 3b of the center conductor is located in the hole. 7 has an insertion hole 7f that fits into the non-threaded portion 3b, has a thick pressing base 7a, and has a circular peripheral wall 7e with a tapered outer peripheral surface.
A telescopic intervening piece having a notch 7c in the peripheral wall leaving a pressing base, and the peripheral wall being separated by the notch 7b and formed into an end shape. 8 is a spring washer, and 9 is a tightening nut. The intervening piece 7 is easily deformed when the nut 9 is tightened, and the outer circumferential surface of the peripheral wall 7e is attached to the mounting hole 6a of the conductive metal fitting, and the inner circumferential surface of the insertion hole 7f is attached to the non-threaded portion 3b of the center conductor. This makes the contact between the conductive metal fitting 6 and the center conductor 3 good. 10 is a fixed electrode fixed to the conductive metal fitting 6, 11 is a fixed electrode 10
A slit arc extinguishing chamber installed so as to surround the outside of the
2, one side is the inner circumference 1c of the inwardly protruding end of the bushing
, the other is an insulating cover into which the downward protruding end 11a of the arc extinguishing chamber 11 fits, 13 is a movable electrode that contacts the fixed electrode 10, and 14 is between the locking step 3c of the center conductor and the outer step 1d of the bushing. intervening patsukin, 15
Cement 16 is attached to the flange portion 1b of the bushing 1.
The presser metal fitting 17, which is fixed by the screws, is an L-shaped packing interposed between the flange portion 1e of the bushing and the presser metal fitting 15 to prevent cement from flowing out when injecting cement.

The present invention has the above structure, and since the intervening piece pushed between the outer peripheral surface of the unthreaded part of the center conductor and the mounting hole 6b of the conductive metal fitting is made of a single member, it is easier to handle than one that is divided into multiple parts. Although it is convenient, the intervening piece has an end shape and has a notch so that it can be inserted and retracted, so it is easily deformed by tightening the nut 9 and is firmly pushed between the two to establish the connection. The effect is particularly noticeable when applied to a device with a large current. Further, since the intervening piece has a thick-walled brim-like pressing base 7a, when it is necessary to remove it for repairs etc., it can be easily removed by engaging the pressing base 7a with a tool such as a lever. It is something.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a conventionally used lead wire, Figure 2 is a vertical sectional view of the lead wire in the present invention, Figure 3 is a side view, and Figure 4 is a similar view of the arc extinguishing chamber. FIG. 5 shows a plan view (a) and a vertical cross-sectional view (b) of the intervening piece, respectively. DESCRIPTION OF SYMBOLS 1... Bushing, 1a... Through hole, 3... Center conductor, 3a... First bolt part, 3b... Unthreaded part, 3c... Second bolt part, 4... Support stand,
6... Conductive metal fitting, 6a... Mounting hole, 7... Intervening piece.

Claims (1)

[Scope of utility model registration request] The first bolt part of the center conductor 3 inserted through the through hole at the center of the bushing 1 is screwed into the mounting hole 4b of the support base 4 fixed to the inner stage of the bushing so that the tip protrudes, and the protruding part A second bolt portion is formed through the non-threaded portion 3b, and the second bolt portion is formed through the non-threaded portion 3b.
Then, fit the tapered mounting hole provided in the conductive metal fitting 6, which expands toward the tip side of the center conductor, with a gap A, and the second bolt part of the center conductor is screwed into the gap A. It has an insertion hole 7f that fits into the non-threaded portion 3b, that is, an intervening piece 7 made of a single member that is deformed by being pushed into the gap by the inserted tightening nut 9, and tightly connects the two. It has a circular peripheral wall 7e having a flange-like pressing base 7a formed in the flesh and a tapered outer peripheral surface, and a notch 7c is provided in the peripheral wall leaving the pressing base, and the peripheral wall is formed by the notch 7b. A connection structure for a lead wire in a pole-mounted switch, characterized by interposing a telescopic intervening piece 7 which is separated and formed into an end shape.