JPS5821387B2 - terminal device - Google Patents

Description

[Detailed Description of the Invention] Generally, terminal devices for connecting conductors such as electric wires and punched conductive plates are made by screwing a cotton screw into the terminal fitting, and tightening the screw to press and clamp the conductor for connection. ing.

By the way, when shipping from the factory, it is ideal to anticipate construction work in advance and loosen the tightening screws to the fullest extent, but the screws may come off during transportation.

Therefore, the screws are tightened so that they do not come off, and the construction worker loosens the screws each time, inserts the conductor, and then tightens the screws.However, when loosening the screws, the limit is unknown, and if the screws are loosened too much, they may be screwed during work. Particularly in electrical equipment such as circuit breakers that are installed at high places, it is difficult to judge how well the screws have been loosened.

Of course, there is a known example such as Japanese Utility Model Publication No. 43-23628, which is intended only to prevent excessive loosening of screws, but this does not prevent the end tightening screw or the threaded part of the screw hole from being crushed. There is a drawback that the tableware, which is a synthetic resin molded product, can break.

That is, in the above-mentioned known example, even when the tightening screw is loosened to the full extent, the threaded portion of the tightening screw and the screw hole are still screwed together.

This is because the effective length of the binding screw is longer than the distance when it is fully loosened.

Therefore, if the tightening screw is not turned idly, and if it is forcibly loosened, both screw threads will be crushed, or if the screw threads overcome, the terminal fitting or the screw head will break the device base.

Of course, if the above two phenomena proceed without occurring, the tightening screw will be released from the screw hole, and the screw hole and the tightening screw will not match well during the next tightening, which will hinder re-screwing. .

The present invention has been made in view of the above-mentioned points, namely, when the threaded portion of the tightening screw is released from the threaded portion of the screw hole, the screw head hits the stopper wall, and the screw This is a terminal device that allows the screw to rotate idly without coming out of the screw hole, and as a result, even when the screw is loosened, the screw will not fall out of the screw hole, and the screw part, etc. will not be damaged by force loosening. This prevents it from being damaged.

The present invention will be explained below based on the drawings showing one embodiment of the present invention. Reference numeral 1 denotes a terminal fitting, an upper plate 3 having screw holes 2, a lower plate 4 corresponding to the upper plate 3, and upper and lower plates 3, 4. It is formed into a box shape with left and right side plates 5 that are connected to each other, and the front and rear sides are open, and the front opening is used as a conductor inlet 6 for a front line, a metal plate, etc.

The metal fitting 1 may be manufactured by bending a single metal plate and joining it with the lower plate 4 as in the embodiment, or by cutting a rectangular pipe into pieces, or by casting.

7 is a tightening screw that is screwed into the screw hole 2, and has a head 8 and a threaded part 9.
It has become.

Reference numeral 10 denotes a synthetic resin main body which has a driver insertion hole 11 corresponding to the head 8 and an inlet 12 corresponding to the inlet 6 of the terminal fitting 1, and is equipped with the terminal fitting 1, and includes a device stand 13 and a cover. 14 and more.

Accordingly, in the drawings of the embodiment, the cover 14 has an insertion hole 11 and an inlet 6.

15 is a stopper wall, loosen this tightening screw 7 and screw hole 2
When the screw portions 2a and 9 of both the screws 2 and 7 are released, the screw head 8 hits the stopper wall 15.

That is, this stopper wall 15 is located in the direction in which the screw advances and retreats, and the head 8 comes into contact with it to prevent it from falling off in the direction in which the screw advances and retreats.

Note that a collar 16 is provided to ensure that the stopper wall 15 and the head 8 come into contact with each other more reliably.

This stopper wall 15 is a thin plate with a horizontal groove 1T of the cover 14.
It is inserted into.

The tightening screw 7 is prevented from falling off in the direction of movement by the stopper wall 15, and means X is required to prevent lateral vibration, that is, from falling off in a direction perpendicular to the direction of movement.

Specifically, as shown in FIG. 2, this is done using a protrusion 18 that protrudes from the cover 14 around the lower end of the tightening screw 7.

The lower end of the tightening screw 7 is surrounded by the protrusion 18, and matches the screw hole 2, so that it is smoothly screwed into the screw hole 2 during screw tightening work.

Of course, the stopper wall 15 and the protrusion 18 are just one means, and other methods may be used.

In the present invention, when the tightening screw 1 is loosened as described above and its threaded portion 9 is released from the threaded portion 2a of the screw hole 2, the head 8 is prevented from falling off in the direction of screw movement as it hits the stopper wall 15. , and the lateral vibration is prevented by the lateral digging prevention means X located around the lower end, so that the tightening screw 7 simply rotates idly, and the screw thread may be crushed due to forcible loosening as in the known example, or the molded product may be damaged. This has the effect that the wires do not crack, and the work of connecting electric wires etc. can be carried out well.

[Brief explanation of the drawing]

The drawings show one embodiment of the terminal device of the present invention, with FIG. 1 being a front view, FIG. 2 being a sectional view, and FIG. 3 being an exploded perspective view. 1...Terminal fitting, 2...Screw hole, 3.
...Top plate, 4...Bottom board, 5...
Side plate, 6...Inlet, 7...Tightening screw, 8...Head, 9...Threaded part, 10.
...Main body, 11...Insertion hole, 12...
... Inlet entrance, 13 ... Instrument stand, 14 ... Cover, 15 ... Stopper wall, X ... Horizontal digging prevention means.

Claims (1)

[Claims] 1. A tightening screw having a threaded portion and a head, an upper plate having a screw hole into which the threaded portion is screwed, a lower plate that holds a conductor between the lower ends of the threaded portion, and left and right side plates connecting the upper and lower plates. Furthermore, a box-shaped terminal fitting was formed with a front opening that served as an inlet for the conductor, and this terminal fitting was placed, and an inlet for the conductor was formed in the side wall corresponding to the inlet of the terminal fitting. A synthetic resin instrument stand, a screwdriver insertion hole that covers the instrument stand, holds the terminal fitting between the instrument stand, and is formed in the earthen wall to correspond to the head of the tightening screw, and further includes a terminal fitting. A synthetic resin cover is formed with a lateral vibration prevention means located directly above the screw hole of the terminal fitting and surrounds the outer periphery of the threaded portion of the tightening screw. The terminal device is characterized by a stopper wall inserted into the horizontal groove of the cover against which the screw head hits.