JP2002025414A - Terminal device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal device of a circuit breaker which is small in size, has flexibility in positioning and can prevent a terminal screw from coming off. SOLUTION: The terminal device 5 has a terminal screw 8, inserted into an insertion hole arranged by drilling at a terminal plate 6 and is screwed down to a female screw hole 19 of a square presser plate member 7 arranged at the bottom side of the terminal plate 6. The presser plate 7 is screwed and fixed to a wall 11 formed on a base stand, and the terminal screw 8 is prevented from falling by a fall-off preventing part 14 formed on a cover 3. By fastening a wire 12 put in from a wire-insertion hole 13 with the terminal screw 8, the presser plate member 7 moves toward the terminal plate 6, and the wire 12 is pinched and fixed by the terminal plate 6 and by the presser plate member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-type terminal device for a circuit breaker.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, a terminal device 22 of a circuit breaker 21 is provided at an end of a casing 25 composed of a base 23 and a cover 24, and is attached to the base 23. A female screw hole 28 into which a terminal screw 27 is screwed is formed in the terminal plate 26, and a pressing member 30 having a through hole 29 through which the terminal screw 27 is inserted is disposed above the terminal plate 26. The electric wire 31 is inserted between the terminal plate 26 and the terminal screw 27 is inserted into the insertion hole 29 of the pressing member 30 and screwed into the female screw hole 28 of the terminal plate 26 by a driver 32 or the like, so that the pressing member 29 Terminal board 26
Has clamped and fixed the electric wire 31.

As shown in FIG. 5, a box-shaped terminal device 4 is provided.
In the case of 1, a box-shaped terminal fitting 4 bent substantially in a section B
Female screw hole 4 into which terminal screw 43 is screwed into upper surface plate 42a
4 and a bottom plate 42 b on the inner surface of the box-shaped terminal fitting 42.
Is provided with a terminal plate 45. By inserting an electric wire into the box-shaped terminal fitting 42 and tightening the terminal screw 43 with a screwdriver or the like, the distal end of the terminal screw 43 presses the electric wire against the terminal plate 45 to connect.

[0004]

As shown in FIG. 6, when the terminal screw 27 is turned with a screwdriver or the like, the terminal screw 27 moves up and down.
The height H of the terminal device 22 from the base 23 varies depending on the diameter of the electric wire 31 connected to the terminal device 22. When the distribution board to which the circuit breaker is attached is made of metal, the wiring cover for protecting the internal devices such as the circuit breaker is also made of metal, and as shown in FIG. Wiring cover 3
3, the terminal screw moves up and down, so that the height of the terminal device becomes large. Therefore, the vertical position where the terminal plate is arranged is limited and the degree of freedom is small. Was. In addition, there is a possibility that the terminal screws may fall off and be lost during the connection work of the electric wires.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional terminal device of a circuit breaker, an object of the present invention is to reduce the height of the terminal device and to provide a degree of freedom in the arrangement position of the terminal device. A terminal device for a circuit breaker, which can prevent the terminal screws from falling off, the structure of which is provided with a screw-fastened terminal at the end of a casing consisting of a base and a cover. In the terminal device of the circuit breaker, the terminal plate attached to the base is provided with an insertion hole through which the terminal screw is inserted, and a cover is formed with a fall-off preventing portion protruding in the axial direction of the terminal screw. A rectangular holding member with a female screw hole to which the terminal screw is screwed is arranged on the lower side, a wall for preventing rotation is formed on the periphery of the holding member, and an electric wire for inserting an electric wire into a part of the wall Form an insertion hole, and insert the terminal board and holding part from the wire insertion hole. It is that the wire was sandwiched and fixed between the terminal plate and the pressing member by inserting a wire tightening the terminal screw between.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a terminal device, a terminal screw is inserted through an insertion hole formed in a terminal plate, and is screwed into a female screw hole of a rectangular holding member disposed below the terminal plate. The holding member is prevented from rotating by a wall formed on the base, and the terminal screw prevents the terminal screw from falling off and prevents the terminal screw from moving up and down by a fall prevention portion formed on the cover. By inserting the electric wire from the electric wire insertion hole formed in a part of the wall and tightening the terminal screw, the pressing member moves in the terminal plate direction, and the electric wire is sandwiched and fixed between the terminal plate and the pressing member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a terminal device for a circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.

The circuit breaker 1 has a terminal device 5 at an end of a casing 4 including a base 2 and a cover 3. The terminal device 5 includes a terminal plate 6, a holding member 7, and terminal screws 8.

The terminal plate 6 is mounted on the base 2 and has an insertion hole 9 larger than the outer diameter of the terminal screw 8 so that the terminal screw 8 can be inserted. The rectangular pressing member 7 is disposed below the insertion hole 9 of the terminal plate 6, and has a female screw hole 10 into which the terminal screw 8 is screwed. A wall 11 is formed on the base 2 at the periphery of the holding member 7, and the holding member 7
Is stopped by the wall 11 and is insulated from each pole. An electric wire insertion hole 13 for inserting an electric wire 12 is formed in a part of the wall 11.

The terminal screw 8 is inserted through the insertion hole 9 of the terminal plate 6 and screwed into the female screw hole 10 of the holding member 7.
The cover 3 is formed with a falling-off prevention portion 14 protruding in the axial direction of the terminal screw 8 so that the terminal screw 8
Is prevented from falling off, and the head of the terminal screw 8 is prevented from moving up and down.

When the electric wire 12 is inserted between the terminal plate 6 and the holding member 7 from the electric wire insertion hole 13 and the terminal screw 8 is tightened with a screwdriver 15 or the like, the holding member 7 moves in the direction of the terminal plate 6 and the terminal is moved. The electric wire 12 is formed by the plate 6 and the holding member 7.
And fix it.

Even if the terminal screw 8 is turned by the driver 15 or the like, the terminal screw 8 itself does not move up and down, so that the height of the terminal device 5 does not increase. Since the height of the terminal device 5 is smaller than that of the conventional terminal device, the degree of freedom of the vertical position of the terminal device 5 is increased.

[0013]

As described above, the terminal device for a circuit breaker according to the present invention is a terminal device for a circuit breaker in which a screw-fastened terminal portion is provided at an end of a casing comprising a base and a cover. The terminal board attached to the base is provided with an insertion hole through which the terminal screw is inserted, a cover is formed with a fall-off prevention part that protrudes in the axial direction of the terminal screw, and the terminal screw is screwed into the lower side of the terminal board. Arrange a square holding member with a screw hole,
A wall for preventing rotation is formed on the periphery of the holding member, an electric wire insertion hole for inserting an electric wire is formed in a part of the wall, and an electric wire is inserted between the terminal plate and the holding member from the electric wire insertion hole. The terminal device has a small height and the terminal device can be placed in a flexible position by tightening the terminal screw to clamp the wire between the terminal plate and the holding member. Has an excellent effect that it can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where an electric wire is connected to a terminal device of a circuit breaker according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where an electric wire is connected to the terminal device of the circuit breaker according to the present invention.

FIG. 3 is a longitudinal sectional view showing a state where an electric wire is connected to a terminal device of a conventional circuit breaker.

FIG. 4 is a longitudinal sectional view showing a state where an electric wire is connected to a terminal device of a conventional circuit breaker.

FIG. 5 is a longitudinal sectional view showing a box-type terminal device of a conventional circuit breaker.

FIG. 6 shows a conventional terminal device for a circuit breaker;
FIG. 3B is a longitudinal sectional view showing a state in which a thin electric wire is connected to a terminal device, and FIG.

FIG. 7 is a longitudinal sectional view showing an insulation distance between a terminal device of a conventional circuit breaker and a wiring cover.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 circuit breaker 2 base 3 cover 4 casing 5 terminal device 6 terminal plate 7 holding member 8 terminal screw 9 insertion hole 10 female screw hole 11 wall 12 electric wire 13 electric wire insertion hole 14 dropout prevention part

Claims (1)

[Claims] 1. A terminal device for a circuit breaker having a screw-fastened terminal at an end of a casing comprising a base and a cover, wherein a terminal screw is inserted through a terminal plate attached to the base. A rectangular holding member having a hole formed therein, a cover for preventing the terminal screw from falling off in the axial direction of the terminal screw, and a female screw hole into which the terminal screw is screwed is formed below the terminal plate. Disposing, forming a wall for preventing rotation around the periphery of the holding member, forming an electric wire insertion hole for inserting an electric wire in a part of the wall, and forming the terminal plate and the holding member from the electric wire insertion hole. A terminal device for a circuit breaker, wherein the electric wire is inserted between the terminal plate and the terminal screw, and the electric wire is clamped and fixed between the terminal plate and the pressing member.