JPH0338945Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cable connection structure in a switch.

(Prior Art) A connecting elbow has conventionally been used as a cable connecting means to a bushing in a switch. For example, there are temporary switches used in high-voltage distribution lines during construction work such as relining electric wires and replacing power distribution equipment. In this type of temporary switch, as shown in FIG. 3, the power supply side cable 22 and the load side cable 2
2A are detachably connected via connecting elbows 23, 23A. This connection elbow 23,2
3A is a cap nut 26 having an unevenness 25 on the outer periphery of the threaded portion provided on the periphery of the end portion of the bushing 24.
By screwing the connecting elbows 23, 23A into the bushing 24, the fastening fitting A firmly holds the fitting state of the connecting elbows 23, 23A to the bushing 24, and maintains a good electrical conduction state.

(Problem to be solved by the invention) In recent years, switches including temporary switches have been miniaturized to save space, and the distance between the bushings 24 has been shortened.
When the connecting elbows 23, 23A are attached to or removed from the connector 4, the adjacent bushing 24 gets in the way, making it difficult to rotate the cap nut 26.

An object of the present invention is to provide a cap nut that facilitates the connection work between a cable connection end such as a connecting elbow and a bushing of a switch in response to the miniaturization of the switch main body.

Structure of the invention (Means for solving the problem) In order to solve the above-mentioned problem, the present invention electrically connects the cable to the bushing fixed to the main body case of the switch via a connecting elbow. In the cable connection structure in which the elbow is fixed to the switch main body case with a tightening fitting, a mounting tube concentric with the bushing is fixed on the main body case side so as to cover the bushing. A male thread is threaded on the outer peripheral surface of the mounting tube, and the tightening fitting is attached to the mounting tube, and a nut portion having a female threaded portion on the inner peripheral surface that is screwed into the male screw, and an outer diameter from the nut portion. It is removably fastened with a cap nut, which has a small diameter and an operating section having a plurality of operating grooves facing in the axial direction on the outer peripheral surface.

(Function) By providing the operation part with a smaller diameter than the nut part by the above means, a wide working space can be obtained without being obstructed by other adjacent cable connection cap nuts, etc., and the cap nuts can be easily tightened and tightened. It will be removed.

(Example) An example embodying this invention will be described below with reference to FIGS. 1 and 2.

In the drawing, reference numeral 1 denotes a bushing extending through the side surface of the switch case 2, and a conductor rod having a tube electrode E at the outer end is disposed inside the bushing. 1a is an annular flange integrally formed on the outer base of the bushing 1. As shown in FIG. Reference numeral 2a denotes a common bushing fixing fitting that is inserted through the outer end of the bushing 1 of each phase, and the flange portion 1a is tightened by tightening nuts 2c to a plurality of bolts 2b protruding from the outer surface of the case 2. It is fixed to case 2. Note that 2d is a spacer through which the bolt 2b is inserted. 3 is a bushing 1 surrounding the outer periphery of the bushing 1.
It is a mounting cylinder provided concentrically with the cylinder, and has a male screw threaded on its outer periphery.

Reference numeral 4 denotes a connecting elbow as a cable connecting end connected to the bushing 1, and a fitting recess 5 is recessed in the distal end of the elbow so as to be able to fit into the outer end of the bushing 1. . Reference numeral 6 denotes a male connection terminal protruding into the fitting recess 5;
It can be connected to the tube electrode E.

Reference numeral 7 denotes a nut portion of a trapezoidal cap nut N having a female thread carved on the inside thereof, and is formed so as to be able to fit into the mounting tube 3. Reference numeral 8 denotes a cylindrical operating portion provided to the nut portion 7 via an annular locking step portion 8a, which is formed to have a smaller diameter than the nut portion 7 and has an insertion hole 9 provided with the connection portion 8a. The distal end side of the elbow 4 is inserted. Note that since the operating section 8 is disposed outward from the nut section 7,
The bolt 2b and nut 2c protrude from the fixture 2a and are arranged outward. Reference numeral 10 designates a plurality of operation grooves formed in the outer circumferential surface of the operation portion 8 from the tip side toward the nut portion 7 side.

Reference numeral 11 denotes a ring that is loosely inserted around the outer periphery of the tip of the connecting elbow 4, and is formed to have an outer diameter that can be locked on the inner surface of the locking step portion 8a.
1 has a pair of long plates 12 protruding from the side surface of the anti-bushing 1. Reference numeral 13 denotes an engaging protrusion protruding from the rear surface of the proximal end of the connecting elbow 4, and the engaging protrusion 13 has bolts 14 fixed to the ends of the pair of long plates 12 at both ends thereof. is inserted into the concave portion of the presser member 15 connected with the nut 17. Further, the holding member 15 is fixed to the engaging protrusion 13 by a pin 16. The ring 11, a pair of long plates 12, a holding member 15, a bolt 14, and a nut 17 constitute a tightening fitting A.

Now, the operation of the cable connection end cap nut N configured as described above will be explained.

First, as shown in FIG. 1, the fitting recess 5 of the connecting elbow 4 is made to correspond to the outer end of the bushing 1, and the connecting terminal 6 is connected to the tulip electrode E. Then, the nut part 7 of the cap nut N is made to correspond to the mounting tube 3, and the operating part 8 is rotated by hand to screw them together.

Then, the locking end 8a of the cap nut N is attached to the ring 1.
1, and the entire connecting elbow 4 is fitted into the bushing 1 via the elongated plate 12 and the holding member 15. As a result, the connection of the connection terminal 6 to the tube electrode E becomes strong. Note that, as shown in FIG. 2, the operating portion 8 of the cap nut N has a smaller diameter than the nut portion 7, so the distance 7A, so that the adjacent operating section 8A and the like do not interfere with the rotational operation of the operating section 8 by hand. Further, since the operating portion 8 is disposed outward from the nut portion 7, the bolt 2b and nut 2c protruding from the fixing metal fitting 2a do not interfere with the rotational operation of the operating portion 8.

Furthermore, in the embodiment described above, the cap nut N was rotated by hand, but instead there is an operation groove 10 at the tip.
This may be accomplished using a key-shaped tightening member 19 provided with a locking protrusion 19a that can be engaged with the locking member 19. In this case, it is possible to obtain a larger operating force than with bare hands, and the final tightening state can be made stronger by the same operation.

Note that any changes may be made without departing from the spirit of the present invention, such as by providing a knurl on the outer periphery of the nut portion 7 so that this large-diameter portion can be rotated by hand as in the conventional method. It may also be carried out.

Effects of the invention As detailed above, in the present invention, the nut part of the cap nut is provided with an operating part whose diameter is smaller than the outer diameter of the nut part, so that the adjacent cap nuts, bushings, etc. do not get in the way. It can take up a large working space, does not go against the trend toward miniaturization in recent years, has improved workability, and has excellent effects in industrial use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cap nut embodying the present invention, FIG. 2 is a front view of the same nut, and FIG. 3 is a perspective view of a conventional cap nut for a cable connection end. 1...butsuthing, 2...main case, 3...
Mounting tube, 4... Connection elbow, 7, 7A... Nut part, 8, 8A... Operation part, 10... Operation groove, A
...Tightening metal fittings, N...Bag nuts.

Claims (1)

[Scope of utility model registration request] In a cable connection structure in which a cable is electrically connected to a bushing fixed to a switch main body case through a connecting elbow, and the elbow is fixed to the switch main body case with a tightening fitting. , a mounting tube concentric with the bushing is fixed on the main body case side so as to cover the bushing, a male thread is threaded on the outer peripheral surface of the mounting tube, and the tightening metal fitting is attached to the mounting tube; The nut part has a female threaded part on its inner circumferential surface that is screwed into the male thread, and an operating part which has a smaller outer diameter than the nut part and has a plurality of operating grooves facing in the axial direction on its outer circumferential surface. A cable connection structure in a switch characterized by being removably fastened with a cap nut.