JPH0794070A - Circuit breaker - Google Patents

Abstract

PURPOSE:To mount a trip display device and a miniature switch for outputting a signal showing a tripping on a specially downsized device protecting circuit breaker having a mechanism automatically reset at tripping. CONSTITUTION:Roller parts 4, 5 are temporarily hooked by the hooking projection 13a of a trip control base 13 in the course of a sliding engaging part 3a being slid by the roller parts 4, 5 at tripping, and an operation handle 1 is stopped in the middle position between ON and OFF by this hooking to display the tripping. At tripping, the operating element 14 of the trip control babe 13 is engaged with the top end of a link 2 or the roller parts 4, 5 and rotated, and a miniature switch 16 is operated by the operating element 14 to output a signal showing the tripping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker of a relatively small size, and more particularly to a circuit breaker equipped with a trip display device for indicating a trip and an alarm switch device.

[0002]

2. Description of the Related Art FIG. 7 shows a miniaturized mechanism similar to the internal mechanism of a circuit breaker disclosed in, for example, Japanese Utility Model Laid-Open No. 1-177824, which is also used in a JIS (Japanese Industrial Standard) C4610 device protection circuit breaker. It is a circuit breaker configured to be applicable. In the figure, 1 is an operation handle for opening and closing,
Reference numeral 2 is a link connected to the operation handle 1 so as to transmit the operation force of the operation handle 1, 3 is a contact arm rotatably supported by a shaft 12, and has a contact 3a at one end and the other end. Is formed so as to engage with the roller pin 5 provided at the tip of the link 2. Reference numeral 4 denotes a roller supported by the roller pin 5. Reference numeral 6 is a latch rotatably supported by a shaft 12 and has a latch portion 6a at the tip.
Holds the closed state of the contact 3a by engaging the roller 4 and holding the roller 4 at the illustrated position. Reference numeral 7 is a frame for holding the operation handle 1, contact arm 3 and latch 6, 8 is an electromagnet portion for detecting overcurrent or short-circuit current, 9 is a movable iron piece formed to operate the latch 6, and 10 is the contact arm 3 A spring 11 is suspended between the frame 7 and the frame 7, 11 is an outer casing case for accommodating the mechanical portion, and 12 is a shaft for holding the contact arm 3 and the latch 6 on the frame 7 as described above.

Next, the operation will be described. First, when an overcurrent or a short-circuit current occurs, the electromagnet unit 8 detects the overcurrent or the short-circuit current, the movable iron piece 9 rotates about the support point 9b, and the operating end 9a pushes the latch 6. This causes the latch 6 to rotate clockwise about the shaft 12,
The engagement between the latch portion 6a at the tip and the roller 4 is released. When the engagement of the roller 4 is released, the engagement of the contact arm 3 and the roller pin 5 is also released, and the contact arm 3 is pulled by the spring 10 to rotate clockwise and the contact 3a is opened. When the contact 3a is opened, the operation handle 1 is rotated counterclockwise by a handle return spring (not shown), and is brought into a reset state as shown in FIG.

[0004]

Since the conventional small circuit breaker is constructed as described above, the handle 1 or the link 2 will move to the OFF position even if a trip occurs due to an overcurrent or a short circuit current. It is unknown whether it is a trip or normal OFF. As a countermeasure against this, it is conceivable to provide a trip display device and an alarm switch device like a general wiring breaker.
A specially miniaturized device such as the C4610 device protection circuit breaker for installation inside an electric device has a small space for providing a trip display device and an alarm switch device, and therefore a mechanism that can be practically used is provided. It was difficult to incorporate.

The present invention has been made to solve the above problems, and when an overcurrent or a short-circuit current occurs, the handle is stopped at an intermediate position between ON / OFF (on / off) and a trip indication is displayed. This ON / OF mechanism
It is an object of the present invention to obtain a circuit breaker in which a mechanism for operating an alarm switch device using a mechanism for stopping at an intermediate position of F is compactly integrated.

[0006]

[Means for Solving the Problems] A tilt-type operation handle,
A link that is connected to the operation handle to form a toggle link mechanism, a roller portion provided at the tip of the link, a latch having an engaging portion that engages with the roller portion at one end, and a roller at one end. Has a sliding contact engaging portion that engages with the contact portion, and a contact arm that is provided with a contact at the other end and is pivotally supported so that it can rotate together with the latch. When the trip occurs, the operation handle is automatically turned off. In the case where the roller unit slides on the sliding contact engaging portion when the circuit breaker trips, a trip control base having a latching protrusion is provided close to the sliding contact engaging portion of the contact arm. It is configured to be temporarily latched by the latching projection, and the latching is configured to stop the operation handle at an intermediate position between on and off.

Further, the latching projection is constructed so that the latching state with the roller portion can be released from the outside. In addition, the trip control base is provided with an actuator formed so as to rotate by engaging with the tip of the link or the roller portion when a trip occurs, and a small switch having an actuator engaging with the actuator is provided to trip. At this time, the small switch is operated by the actuator.

[0008]

When the trip occurs, the roller portion is temporarily locked by the latching projection of the trip control base while the roller portion slides on the sliding contact engagement portion, and this latching causes the operation handle to turn on and off. It indicates that it has stopped at the intermediate position of and tripped.

Further, when a trip occurs, the operator of the trip control base engages with the tip of the link or the roller portion to rotate, and the operator operates the small switch to output a signal indicating that the trip has occurred.

[0010]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS. 1 is a handle, 2 is a link, 4 is a roller, 5
Is a roller pin, 6 is a latch, 7 is a frame, 8 is an electromagnet part, 9 is a movable iron piece, 10 is a spring, 11 is an outer casing case of the main body, 12 is a shaft, and these are the same as those of the conventional circuit breaker for wiring. It is a thing. Reference numeral 3 denotes a contact arm rotatably supported by a shaft 12, which has a contact 3a at one end and a sliding contact engagement portion 3b which engages with a roller pin 5 provided at the tip of the link mechanism 2 at the other end. Has been formed. The sliding contact engagement portion 3b is formed in a gentle arc shape according to the movement of the roller pin 5.

Reference numeral 13 denotes a trip control base made of an elastic synthetic resin. As shown in FIG. 6, the trip control base 13 is provided with a recessed hole 13b in the bottom surface thereof, and the outer casing case 1 for the main body is provided.
It is formed so that it can be mounted only by fitting it to the first convex portion 11a. The trip control base 13 is provided with a hooking protrusion 13a formed so as to be able to bend as shown in FIGS. Reference numeral 14 is an actuator, which is rotatably supported by the trip control base 13 by a shaft 15. The operating element 14 has operating pieces 14a and 14b. Reference numeral 16 is a small switch for outputting a signal indicating a trip, and is arranged so as to be activated when the actuator 16a is engaged with the operating piece 14a. A terminal block 17 holds the small switch 16, and a terminal fitting for extracting a signal from the small switch 16 is provided. Reference numeral 18 denotes a handle return spring (also referred to as a reset spring), which urges the handle 1 counterclockwise.

Next, the operation of the circuit breaker having the above structure will be described. When an abnormal overcurrent or short circuit current occurs, the electromagnet 8 detects the overcurrent or short circuit current and attracts the movable iron piece 9. Due to this suction, the movable iron piece 9 rotates about the support point 9b, and the operating end 9a pushes the latch 6. As a result, the latch 6 rotates clockwise around the shaft 12 to release the engagement between the latch portion 6a at the tip and the roller 4. Laura 4
When the engagement is released, the engagement between the contact arm 3 and the roller pin 5 is also released, and the contact arm 3 is pulled by the spring 10 to rotate clockwise and the contact 3a is opened. FIG. 2 shows this moment. From this state, the handle 1 returns to the O position by the force of the handle return spring 18.
The rotation starts in the direction of the FF position (counterclockwise). When the handle 1 rotates, the roller 4 and the roller pin 5 slide on the gently arcuate sliding contact engaging portion 3b of the contact arm 3 in conjunction with this rotation and move to the trip position. FIG. 3 shows this state.

When the roller pin 5 is moved to the trip position as described above, as shown in FIG.
3 is temporarily hooked by the hooking protrusion 13a and stopped.
By this hooking, it is displayed that the operation handle 1 has stopped at an intermediate position between ON and OFF (position indicated by a solid line in FIG. 3) and tripped.

The reset from the trip state to the OFF position is performed by forcibly rotating the operation handle 1 in the OFF direction. That is, the roller pin 5 is the trip control base 1
Although it is hooked by the hooking protrusion 13a of No. 3, since the hooking protrusion 13a has elasticity, when the operation handle 1 is forcibly rotated, the roller pin 5 is released from the hooking protrusion 13a and moves to the OFF position. 8 together with the operation handle 1.
The reset state is the same as that of the conventional device.

During the trip operation, the roller 4 engages with the operating piece 14a of the operating element 14 supported by the trip control base 13 to rotate the operating element 14. By this rotation, the operating piece 14b engages with the actuator 16a to operate the small switch 16, and the small switch 16 generates a signal indicating a trip. The small switch 16 is integrally mounted on a terminal block made of synthetic resin, and is fitted in the main body outer case case 11.

Example 2. In the first embodiment, the roller 4 and the roller pin 5 are composed of different parts, but the same function can be obtained by integrating them. Also, the roller 4
Has shown that the actuator 14 is rotated by engaging with the actuator piece 14a of the actuator 14, but the shape of the tip of the link 2 may be such that the actuator 14 can be engaged.

Embodiment 3. Further, in the first embodiment, the trip control base 13 and the latching protrusion 13a are integrally formed of elastic synthetic resin. However, only the latching portion of the latching protrusion 13a is applied with a force of a predetermined value or more from the outside. It may be configured to be bent only when the force is applied to release the engagement with the roller 4 and to return by a return spring or the like except for the external force.

[0018]

As described above, according to the present invention, when the breaker trips, the roller portion is temporarily moved by the latching protrusion of the trip control base while the roller portion slides on the sliding contact engagement portion. Since the operation handle is stopped at an intermediate position between ON and OFF to indicate that the trip has occurred, the trip display means is accurate even with a small circuit breaker. available. Also, when a trip occurs, the operator of the trip control base engages with the tip of the link or the roller portion and rotates, and this actuator operates the small switch to output a signal indicating that the trip has occurred. Therefore, more accurate trip display means can be obtained even with a small circuit breaker.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, (a) is a front view, (b)
FIG. 7A is a top view of FIG.

FIG. 2 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the embodiment of the present invention.

5A and 5B are explanatory views of the operation of the embodiment of the present invention, in which FIG. 5A is a front view and FIG. 5B is a top view of FIG.

FIG. 6 is a perspective view showing a mounting procedure of the trip control stand according to the embodiment of the present invention.

FIG. 7 is a front view showing a conventional circuit breaker for wiring.

FIG. 8 is a front view for explaining the operation of the conventional circuit breaker for wiring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle 2 Link mechanism 3 Contact arm 3b Sliding contact engagement part 4 Roller 5 Roller pin 6 Latch 6a Latch part 7 Frame 11 Main body outer case 13 Trip control stand 13a Latching protrusion 14 Actuator 14a Operating piece 16 Small switch 16a Actuator 16a 17 terminal block

Claims (3)

[Claims] 1. A tilt-type operation handle, and a link connected to the operation handle to form a toggle link mechanism,
A roller portion provided at the tip of the link, a latch having an engaging portion that engages with the roller portion formed at one end, a sliding contact engaging portion that engages with the roller portion at one end, and the other end. And a contact arm pivotally supported so that it can rotate together with the latch, and the contact handle is automatically rotated in the off direction when a trip occurs. A trip control base having a latching protrusion is provided in the vicinity of the contact engagement portion so that the roller portion temporarily engages with the latch protrusion while the roller portion slides on the sliding contact engagement portion when the breaker trips. A circuit breaker, characterized in that the operation handle is stopped at an intermediate position between ON and OFF by being stopped. 2. The circuit breaker according to claim 1, wherein the latching projection is configured so that the latched state with the roller portion can be released from the outside. 3. The trip control base is provided with an actuator formed so as to rotate by engaging with a tip of a link or a roller portion when the breaker trips, and an actuator engaging with the actuator. 3. The circuit breaker according to claim 1, wherein a small switch is provided, and the small switch is operated by the actuator when the breaker trips.