JP2988089B2 - Circuit breaker terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device for a circuit breaker, and more particularly to a structure of a reinforcing plate for protecting a wall surface of a mold case with which a washer contacts.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a conventional structure.
3A is a front view of the circuit breaker, FIG. 3B is a side view thereof, and FIG. 4 is an enlarged view of a terminal portion of FIG. In the figure, terminal portions 1 are provided before and after the circuit breaker (on the power supply side and the load side), and the terminal portions 1 are provided with terminal plates 4 between the left and right walls 3 integrated with the mold case 2. The wire 6 (FIG. 4) provided between the washer 5 and the terminal plate 4 is fastened by a terminal screw 7. Reference numeral 8 denotes a spring washer.

When the terminal screw 7 is tightened and the washer 5 is turned together with the terminal screw 7, the electric wire 6 is shifted and escapes from being pinched, so that the washer 5 is formed in a square shape (square), and the side surface of the washer 5 is formed as a wall 3. It is designed to prevent rotation when hitting. At that time, when the washer 5 directly hits the wall 3, a local force acts on the wall 3 from the corner of the washer 5 due to the torsion torque, and the wall 3 is deformed or the wall is damaged. Therefore, as shown in FIG. 4, both sides of the terminal plate 4 are bent in a U-shape along the wall 3, and the bent portion 4a receives the force from the washer 5.

[0004]

However, in the conventional configuration in which both sides of the terminal plate 4 are bent into a U-shape, the width of the terminal plate 4 is increased by the thickness of the bent portion 4a, and accordingly the mold case 2 is bent. However, there has been a problem that the width of the circuit breaker becomes large and the circuit breaker becomes large. Even if the strength is increased by increasing the thickness of the wall 3 instead of bending the terminal plate 4, the point that the mold case 2 becomes larger does not change. SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal device for a circuit breaker in which a wall of a mold case can be protected from a washer while suppressing a width dimension of a terminal portion.

[0005]

According to the present invention, a U-shaped reinforcing plate is inserted between a terminal plate and a mold case.

[0006]

In the prior art, since the portion corresponding to the washer is formed integrally with the main body of the terminal plate, the thickness of the terminal plate becomes larger than necessary, and the width of the terminal portion also increases. Therefore, in the present invention, the reinforcing plate is formed in a U-shape separately from the terminal plate, and inserted between the terminal plate and the mold case. Thus, the reinforcing plate can be made of a thin plate having sufficient strength for protecting the wall, and the dimension in the width direction can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a front view of the terminal portion, and FIG.
Is a plan view thereof. Note that the same reference numerals are used for the portions corresponding to the conventional example. In the figure, reference numeral 9 denotes a reinforcing plate formed by bending a thin iron plate into a U-shape. In this case, the reinforcing plate 9 is inserted between the terminal plate 4 of a simple rectangular plate and the mold case 2, and both side walls 9a are square washers 5a. Are close to both end faces. Further, a through hole 10 through which the terminal screw 7 is inserted is formed in the bottom 9 b of the reinforcing plate 9. The reinforcing plate 9 is positioned such that the side wall 9 a is fitted into the recess of the wall 3.

When the terminal screw 7 screwed into the screw hole of the terminal plate 4 is tightened, the electric wire 6 sandwiched between the washer 5 and the terminal plate 4 is tightened.
However, the corners 5a (FIG. 2) hit the side walls 9a of the reinforcing plate 9 and are prevented from rotating, and the wires 6 are firmly tightened without escaping from between the washer 5 and the terminal plate 4. The local force acting on the wall 3 from the corner 5a of the washer 5 via the side wall 9a of the reinforcing plate 9 is distributed to the wall 3 and transmitted to the wall 3, so that the wall 3 is deformed or the wall is damaged. Or not.

Since the reinforcing plate 9 can be formed by a plate that is extremely thin compared to the terminal plate 4, the width of the terminal portion 1 is greatly increased compared to the case where both sides of the terminal plate 4 are bent and the washer 5 is brought into contact. Only a little is needed. In particular, if the side wall 9a is embedded in the wall 3 as in the illustrated embodiment, the width dimension hardly increases. Note that the reinforcing plate 9 may be fixed to the bottom surface of the terminal plate 4 by spot welding, or a nut may be used instead of screwing the terminal screw 7 into the terminal plate 4.

[0010]

According to the present invention, the U-shaped reinforcing plate separate from the terminal plate is inserted between the terminal plate and the mold case, so that the width of the terminal portion is hardly increased. Wall can be protected from washer,
To that extent, the circuit breaker can be made compact.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3A is a front view of a circuit breaker showing a conventional example,
(B) is a side view thereof.

FIG. 4 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal part 2 Mold case 3 Wall 4 Terminal plate 5 Washer 6 Electric wire 7 Terminal screw 8 Spring washer 9 Reinforcement plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-93467 (JP, A) JP-A-51-101556 (JP, U) JP-A-55-52752 (JP, U) JP-A-63 93044 (JP, U) Japanese Patent Publication No. 46-35468 (JP, B1) Japanese Utility Model Publication No. 48-27710 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 71/08 H01H 73 / 20 H01H 1/58 H01R 9/00

Claims (1)

(57) [Claims] 1. A circuit breaker in which a terminal plate is arranged between walls of a mold case, and an electric wire is sandwiched between the square washer which is prevented from rotating by the wall and the terminal plate and is tightened by terminal screws. A terminal device for a circuit breaker, wherein a U-shaped reinforcing plate for protecting a wall of a mold case from a washer is inserted between the terminal plate and the mold case.