JPH0810921Y2 - Trip button device for circuit breaker - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a trip button device provided for performing an operation test of a trip mechanism in a circuit breaker such as a circuit breaker for wiring.

2. Description of the Related Art FIG. 3 is a vertical cross-sectional view showing an example of a circuit breaker equipped with the above-mentioned trip button device. Each part is housed in a molded case composed of a case body 1 and a cover 2. In the turning-on state shown in the figure, a current flows through a route of fixed contact 3 which also serves as a power source side terminal → movable contact 4 → lead wire 5 → connecting conductor 6 → overcurrent trip device 7 → load side terminal 8. The movable contactor 4 is held by a holder 9 for each pole, and the holder 9 is rotatably supported by the case body 1. The movable contactor 4 is opened and closed by an opening / closing mechanism 10 via a holder 9, and the opening / closing mechanism 10 is held in the illustrated state by latching a latch 11 to a tripping mechanism 12. In such a state, when a large current such as a short circuit current flows, the overcurrent trip device 7 operates and trip trip bar
13 is moved in the direction of the arrow in the figure, and the engagement between the latch receiver 14 that locks the latch 11 and the claw 15 is released. As a result, the latch 11 is released, and the opening / closing mechanism 10 releases the force accumulated in the opening / closing spring 16 to open the movable contactor 4. By the way, the circuit breaker is provided with a trip button device in order to manually test whether the trip mechanism 12 operates normally as described above. That is, a guide hole 17 is provided in the cover 2, and a rod-shaped trip button 18 is slidably accommodated in the guide hole 17 together with a compression spring 19. The tip of the trip button 18 is formed with an inclined surface 20 that is inclined in one direction, and when the trip button 18 is pushed down against the spring 19, the inclined surface 20 acts on the trip crossbar 13 and this is shown in the figure. The tripping mechanism 12 is moved in the direction of the arrow to trip the tripping mechanism 12 in the same manner as when the overcurrent tripping device 7 operates. FIG. 4 is an enlarged exploded perspective view showing the guide hole 17 of the cover 2 and the trip button 18 inserted therein. Guide hole 17
Is a square hole 17 for guiding the prismatic body 21 of the trip button 18.
It is a two-stage hole of a and a circular hole 17b for guiding the cylindrical head 22. On the other hand, the trip button 18 has a square hole 17 at the tip of the body 21.
Both shoulders 21a wider than a and a taper 21b following this are formed, and a slit 23 is cut between them. The trip button 18 with the spring 19 mounted on the body 21 is tapered.
By the action of 21b and the slit 23, the tip end is elastically deformed and pushed into the guide hole 17, and when both shoulders 21a pass through the square hole 17b, they return to the original shape and both shoulders 21a engage with the lower surface of the cover 2, It has a structure that prevents it from coming off.

[Problems to be solved by the device]

As described above, the body portion 21 of the trip button 18 has the sloped surface 20 formed at the tip of the trip button 18 accurately.
Although it is formed in a square cross section so as to contact with,
When the trip button 18 is incorporated into the cover 2, there is a risk that the trip button 18 may be misaligned with respect to the guide hole 17. If the direction is wrong, the inclined surface 20 swings from the predetermined direction to the side or the opposite direction, and even if the trip button 18 is pressed, the trip crossbar 13 cannot be moved. It is an object of the present invention to provide a trip button device for a circuit breaker which eliminates such an error and can always incorporate the trip button in the correct direction.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an uneven portion between the trip button and the guide hole that regulates the fitting direction of each other.

[Action]

By providing an uneven portion between the trip button and the guide hole and fitting them together, the direction in which the trip button is inserted into the guide hole is regulated to a fixed value, and no error occurs.

【Example】

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same or corresponding parts as those of the conventional example are designated by the same reference numerals, and the description of the same parts will be omitted. here,
FIG. 1 is an exploded perspective view of a guide hole and a trip button inserted therein, FIG. 2 (A) is a front view of the trip button of FIG. 1, FIG. 2 (B) is a side view thereof, and FIG. It is the bottom view. In the figure, a convex strip 24 protruding in an arc shape is integrally formed on the body portion 21 of the trip button 18, and the convex strip 24 is fitted in the square hole 17a of the guide hole 17 into which the body portion 21 is inserted. A groove 25 is formed. To incorporate the trip button 18 into the cover 2, align the ridge 24 with the groove 25 and insert the trip button 18 into the guide hole 17, but if the trip button 18 is misaligned by 90 degrees or 180 degrees, It can be immediately understood that the side wall of the square hole 17a and the ridge 24 interfere with each other and the ridge 24 cannot be inserted, and the orientation is wrong. In the illustrated embodiment, the convex strip 24 is formed on the trip button 18 side and the concave strip 25 is formed on the guide hole 17 side, but the relationship of irregularities may be the opposite, and the cross-sectional shape of the guide hole 17 and the trip button 18 itself. May have a trapezoidal shape so that they can be fitted only in a certain direction.

[Effect of device]

According to this invention, since the trip button can be installed in the cover only in the correct direction, it is possible to prevent the occurrence of a malfunction due to an assembly error.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 (A).
Is a front view of the trip button in FIG. 1, FIG. 2 (B) is its side view, FIG. 2 (C) is its bottom view, and FIG.
FIG. 4 is a vertical sectional view of a circuit breaker, and FIG. 4 is an exploded perspective view of a conventional example. 2 ... Cover, 12 ... Tripping mechanism, 17 ... Guide hole, 18 ...
… Trip button, 24 …… projection, 25 …… concave groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO 57-133837 (JP, U) ACTUAL SHO 55-51875 (JP, U) ACTUAL SHO 63-105243 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A rod-shaped trip button having a sloping surface sloping in one direction at its tip is slidably accommodated in a guide hole of a circuit breaker main body cover, and the trip button is pushed to push the sloping surface. In the trip button device of the circuit breaker that acts on the trip mechanism of the circuit breaker to trip the trip mechanism, an uneven portion is provided between the trip button and the guide hole to regulate the mutual fitting direction. A trip button device for circuit breakers.