JPH0112761Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to circuit breakers.

Generally, a circuit breaker integrates an overcurrent detection device that attracts the armature when an overcurrent occurs, a tripping mechanism, etc. into an insulating case, and manually opens or closes a normal electrical circuit. In addition, when an overcurrent occurs due to overload, short circuit, etc., a tripping mechanism is activated in response to an overcurrent detection device to automatically cut off the electrical circuit, resulting in a trip state.

In conventional circuit breakers, when switching from a closed state to a trip state, an operating knob for manual operation is displaced from a closed position to an open position in response to a tripping mechanism. Therefore, when the operating knob is in the open position, it is possible to determine whether the circuit breaker is in the open state by manual operation, or if an overcurrent has occurred in the circuit and the tripping mechanism is activated, causing the circuit breaker to trip. It was not possible to visually confirm whether the circuit was in an open state, a so-called trip state.

The present invention has been developed in view of the above, and it is an object of the present invention to provide a circuit breaker that can distinguish between an open state caused by manual operation and a tripped state caused by the operation of a tripping mechanism, just by looking at the position of the operating knob.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are a front sectional view and a plan view of the embodiment of the present invention in an open circuit state, FIGS. 3 and 4 are a front sectional view and a plan view in a closed circuit state, and FIGS. 5 and 6 Similarly, they are a front sectional view and a plan view in a tripped state. The circuit breaker is assembled as a whole in a rectangular case 1 made of an insulator, and is composed of an overcurrent detection device A and a tripping mechanism B.

The overcurrent detection device A has a movable contact 2 and a fixed contact 3.
An armature 6 is connected to the main circuit formed by the coil 4 and is attracted to the magnet 5 of the coil 4 when an overcurrent flows through the coil 4. A pin 8 is provided on the yoke 7.
The armature 6 is rotatably supported using the armature 6 as a fulcrum, and a kick-out portion 6a is integrally formed on the armature 6. The yoke 7 fixes the coil 4 and forms a magnetic circuit, and is bent parallel to both sides so as to sandwich the tripping mechanism B.

The tripping mechanism B rotatably supports a movable contact plate 9 equipped with a movable contact 2 that opens and closes with respect to a fixed contact 3 by a fulcrum elastically supported along a predetermined direction. A sliding pin 10 is arranged on the back side near the position where the movable contact 2 is provided at 9, and the central part of the trip rod 11 that can slide with one side always in contact with the sliding pin 10 is approximately A swinging link 14 is supported swingably at one end of a movable connecting link 12 in a U-shaped long hole provided in the yoke 7, and a swinging link 14 is swingably supported at one end of a movable connecting link 12 formed in a U-shape and provided in the yoke 7. The other end of the connecting link 12 is swingably supported at a point closer to the trip rod 11 than the fixed shaft 13, and the other end of the swinging link 14 is supported at a point closer to the trip rod 11 than the fixed shaft 13. A pin 15 is provided at the opposite point, and an operating knob 16 that forms a groove that engages with the pin 15 and slides is placed on the side opposite to the side on which the coil 4 of the rectangular case 1 is disposed. The guide part 1a is slidably engaged with the guide part 1a, and a part thereof is exposed to the outside from the rectangular case 1 through an opening part 1b provided on the same side as the guide part 1a of the rectangular case 1. The operating knob 16 is configured to slide and move in conjunction with the swinging movement of the swinging link 14, and the connection link between the part of the trip rod 11 that contacts the sliding pin 10 and the center part is configured to enable opening and closing operations. A fulcrum plate 17, which is provided with a stepped part that holds the 12 supporting points and hooks one end on the opposite side, and is kicked by the kicking part 6a of the armature 6, is rotatably supported by a pin 18 provided on the yoke 7. . The above-mentioned elastic support means for the movable contact plate 9 is provided by drilling an elongated hole 9a in a predetermined direction in the support portion of the movable contact plate 9, and then attaching the yoke 7 to the movable contact plate.
A fixing pin 19 provided above is inserted through the elongated hole 9a, and a spring 20 provided on the fixing pin 19 presses the supporting portion of the movable contact plate 9 in a direction toward the operating knob 16.

A stop 14a that contacts the trip rod 11 during tripping is provided on the end surface of the swing link 14 opposite to the position where the pin 15 that engages with the operating knob 16 is provided with respect to the fixed shaft 13. The link 14 is always pressed to the open position by a spring (not shown) provided on the fixed shaft 13.

On the outside of the operation knob 16, marks "OFF" and "ON" representing the open and closed circuit states are attached to the corresponding sides from the opening 1b provided in the square case 1, and a trip button is attached at approximately the center position. A mark 16a indicating the state is attached. In addition, a display section 1c is provided adjacent to the opening 1b in the rectangular case 1.
is provided at approximately the center position of the operating knob 16 in the sliding displacement direction.

To explain the operation of the embodiment of the present invention constructed as described above, in a normal state, the trip lever 11 moves the operation knob 1 using the stepped portion provided on the fulcrum plate 17 as a fulcrum.
The movable contact plate 9 swings via the connecting link 12 in response to the swing displacement of the swing link 14 caused by sliding the switch 6, and this swing causes the movable contact plate 9 to open and close the movable contact 2 relative to the fixed contact 3. I do. In addition, in the event of a trip due to overcurrent generation, the fulcrum plate 17
is kicked by the kick-out portion 6a of the armature 6, and the stepped portion of the fulcrum plate 17 comes off the trip rod, the trip rod 11 becomes rotatable, and the movable contact plate 9 is moved by the spring 20.
This movement causes the trip rod 11 to rotate around the point supported by the connecting link 12 via the sliding pin 10 and comes into contact with the end surface of the swing link 14 on the trip rod side. . Also, swing link 1
4 is rotated in the opening direction by a spring provided on the fixed shaft 13, so that the trip rod 11 and the end surface of the swing link 14 on the trip rod side contact and slide. When the abutment 14a provided on the end surface of the swing link 14 contacts the trip rod, the sliding friction between the two increases significantly and the swing link 14 stops rotating in the opening direction. This swing link 14 is interlocked with the operating knob 16, so the operating knob 16
The swing link 14 also stops at a position corresponding to the stop position of the swing link 14 due to the above-mentioned hit 14a.

At this time, the mark 16a attached to the operating knob 16 indicating the trip state is stopped at the position of the display section 1c provided on the rectangular case 1, as shown in FIGS. 5 and 6, so that the trip state can be visually recognized from the outside. It's becoming like that. Manual resetting from this state is accomplished by moving the operating knob 16 in the opening direction against the sliding friction described above.

As explained above, according to the present invention, it is possible to distinguish at a glance the open circuit state, which is opened by manual operation, and the trip state, which is opened due to the occurrence of overcurrent. If one of the circuit breakers becomes tripped in a panel where many circuit breakers are installed,
It is now possible to check the defective circuit at a glance.

[Brief explanation of drawings]

1 and 2 are a front sectional view and a plan view showing an open circuit state of the embodiment of the present invention, FIGS. 3 and 4 are a front sectional view and a plan view showing a closed circuit state, and FIGS. 5 and 6 The figures are a front sectional view and a plan view showing the tripped state. 1... Square case, 2... Movable contact, 3... Fixed contact, 4... Coil, 5... Magnet, 6...
... Armature, 7 ... Yoke, 9 ... Movable contact plate, 11 ... Trip rod, 12 ... Connection link,
14... Swing link, 16... Operation knob, 17
...Fullin plate, 1c...Display section, 14a...Perfect,
16a...Mark.

Claims (1)

[Scope of utility model registration request] An operating knob that slides along a guide portion formed on the case, an overcurrent detection device that attracts the armature when an overcurrent occurs, and a rocking device that engages with the operating knob and pivots around a fixed axis. link and
and a tripping mechanism that is interposed between the swing link and the movable contact plate and includes a trip lever that unlocks the pressing force of the movable contact plate by the operation of the overcurrent detection device, and the movable contact plate is connected to the operating knob. In a circuit breaker that turns on and off and shuts off a movable contact plate when an overcurrent is detected, the overcurrent detection device causes the tripping mechanism to apply a pressing force of the movable contact plate to the curved surface of the swing link facing the trip rod. A mark is provided on the operating knob, and the mark is visually visible between the on and off positions of the operating knob. The circuit interrupter is characterized in that the case is provided with a display section capable of displaying the operating knob, and the operating knob is locked at the contact position during the tripping operation, and the mark is visible from the display section at that position. vessel.