JP2719025B2 - Circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit breaker of a remote control type or the like.

[Conventional technology]

A circuit breaker having a contact portion formed by a pair of movable contacts, for example, a first movable contact is operated by a handle, and a second movable contact is operated by an electromagnet independently of the first movable contact. There is a remote control type circuit breaker like this.

However, there is a problem that the ON state of the first movable contact and the contact state of the second movable contact cannot be known from outside or from a remote place.

Therefore, an on-signal extracting device has been proposed in which a switch linked to the operation of the first movable contact and a switch linked to the operation of the second movable contact are connected in series.

[Problems to be solved by the invention]

However, in this circuit breaker, since a switch is provided for each movable contact, there is a drawback that the storage space of the switch in the base is increased, the number of connections is increased, and the reliability is reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a circuit breaker capable of reducing a storage space, simplifying connection and improving reliability.

[Means for solving the problem]

A circuit breaker according to the present invention includes a first movable contact having a first contact movable between an on position and an off position, and a second movable contact that comes into contact with and separates from the first contact at the on position. A second movable contact having a contact, a first spring in which an action portion is maximally biased at an ON position of the first contact in conjunction with an ON operation of the first movable contact; A second spring whose operating portion is maximally biased at the contact position of the second contact in conjunction with a contact operation of a second movable contact;
And the maximum spring force of the first spring and the second spring are pressed by the action portion of the second spring and the action portion of the second spring.
And a switch having a return force greater than the maximum spring force of the first spring and smaller than the sum of the maximum spring forces of the first spring and the second spring.

[Action]

According to the configuration of the present invention, the first spring is linked to the ON operation of the first movable contact, the second spring is linked to the contact operation of the second movable contact, and the first movable contact is When the first movable member and the second movable contact member are in contact with each other, the first spring and the second spring are each urged to the maximum, and each spring force is applied from the operating portion to the operating portion of the switch. The switch operates to provide a signal indicating that it is in a contact state. Therefore, since only one switch is required, the storage space for the table can be reduced, the connection can be simplified, and the reliability can be improved.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS. That is, the circuit breaker includes a first movable contact 1, a second movable contact 2, a first spring 3,
It has a second spring 4 and a switch 5.

The first movable contact 1 has a first contact 6 movable between an on position and an off position. First movable contact 1
3, is supported by a fixed shaft 13 of a table 14 and is urged to open by a contact pressure and opening spring 15.

The second movable contact 2 has a second contact 7 that comes into contact with and separates from the first contact 6 in the ON position. As shown in FIG. 3, the second movable contact 2 is supported by a shaft 17 at one end of an L-shaped arm 16, and a contact pressure spring is provided on the opposite side of the shaft 17 from the second contact 7. There are 18 intervening. The bent portion of the arm 16 is supported by a fixed shaft 20 of the table 14.

The action portion 9 of the first spring 3 is urged to the maximum at the ON position of the first contact 6 in conjunction with the ON operation of the first movable contact 1. The first spring 3 is formed by a wire spring having a winding portion 19 at an intermediate portion. The winding portion 19 is supported by a fixed shaft 21, and a bent portion at one end is engaged with a receiving portion 22 of the first movable contact 1. The engaging portions 8 are combined.

The action portion 11 of the second spring 4 is urged to the maximum at the contact position of the second contact 7 in conjunction with the contact operation of the second movable contact 2. The second spring 4 is also formed of a wire spring having a winding portion 23 at an intermediate portion. The winding portion 23 is supported by a fixed shaft 24, and a bent portion at one end is engaged with a receiving portion 26 of the second movable contact 2. The mating engagement portion 10 is provided.

The switch 5 is pressed by the action portion 9 of the first spring 3 and the action portion 11 of the second spring 4 so that the maximum spring force of the first spring 3 and the maximum spring force of the second spring 4 become larger. The operating portion 12 has a large restoring force that is smaller than the sum of the maximum spring forces of the first spring 3 and the second spring 4. The switch 5 is a micro switch as an embodiment, and its operation unit
The other end of the second spring 4 acting as the acting portion 9 is engaged with the other end of the second spring 4 acting as the acting portion 11. The return force of the operation unit 12 built in the microswitch is applied by a return spring, and the first movable contact 1 is turned on when the first movable contact 1 is in the ON state.
The maximum spring force of the spring 3 and the spring force of the second spring 4 when the second movable contact 2 is in a contact state,
The spring force is set to be smaller than the total spring force. Reference numeral 29 denotes a terminal of the switch 5, and a lead wire to be drawn outside is not shown.

This switch 5, a fixed shaft 21 supporting the first spring 3,
A fixed shaft 24 for supporting the second spring 4 is provided on one surface of the insulating plate 27, and is disposed on the side of the first movable contact 1 and the second movable contact 2. This facilitates the incorporation into the base 14, and electrically and mechanically insulates the switch 5 from the first movable contact 1 side. 28 is a through hole through which the fixed shaft 13 passes.

The circuit breaker is of a remote control type in the embodiment. That is, in this remote control circuit breaker, 30 is a power supply side terminal, and 31 is a load side terminal. Then, the first movable contact 1 is operated by the mechanism section 32, and the second movable contact 2 is operated by the electromagnet 33.

The mechanism section 32 has a trip link 35 responsive to the operation of the abnormal current detecting means 34, has a latch link 36 latched by the trip link 35, and the latch link 36
The first movable contact 1 has a handle 37 for turning on or off the first movable contact 1 while being latched by the latch 35, and the latch link 36 is detached from the trip link 35 when the first movable contact 1 is on. Then, the first movable contact 1 is trip-opened. 35a is a latch portion of the trip link 35, 35b is a return spring of the trip link 35, 35c is a fixed shaft of the trip link 35, 36a is a locking portion of the latch link 36 latched by the latch portion 35a, 37a is a handle return spring, 37b is a fixed shaft of the handle 37, 38 is a slit formed in the latch link 36, 39 is a movable shaft sliding on the slit 38, 40 is a handle 37 and a movable shaft
Reference numeral 41 denotes a first link connecting the movable shaft 39 to the first movable contact 1, and reference numeral 41a denotes a connection shaft.

The abnormal current detecting means 34 includes a short-circuit sensor 42 constituted by an electromagnet and an overcurrent sensor constituted by a bimetal.
Consists of 43.

The electromagnet 33 for operating the second movable contact 2 is a polarized and bistable type, and the plunger 44 is connected to the other end of the arm 16 by a connecting shaft 47.
And holds the contact position and the separation position of the second movable contact 2 at stable positions. Reference numeral 45 denotes an assisting spring that urges the plunger 44 in a direction in which the second movable contact 2 contacts, and reference numeral 46 denotes a lead wire that inputs an operation signal to the electromagnet 33.

FIG. 4 shows a circuit configuration, in which the power supply side terminal 30 and the second
The movable contact 2 is connected by a flexible lead 48, the first movable contact 1 and the overcurrent sensor 43 are connected by a flexible lead 50 via a frame 49, and the overcurrent sensor 43 and the electromagnet are connected. 42, one end of the coil 51 is connected by a flexible lead wire 52, and the other end of the coil 51 is connected to the load-side terminal 31,
The load terminal 31 via the first contact 6 and the second contact 7
An electric circuit is formed between the power supply terminal 30 and the power supply side terminal 30.

According to this embodiment, the first spring 3 is interlocked with the ON operation of the first movable contact 1, the second spring 4 is interlocked with the contact operation of the second movable contact 2, and the first Movable contact 1 and 2
When the movable contact 2 is in the contact state, the first spring 3 and the second spring 4 are respectively urged to the maximum, and the respective spring forces are applied to the operation section 12 of the switch 5 from the action sections 9 and 11, When the operation unit 12 is pressed, the switch 5 is operated, whereby a signal indicating that the switch is in the contact state is obtained. Therefore, the pedestal
The storage space of 14 can be reduced, the connection can be simplified, and the reliability is high because one switch 5 is provided.

FIGS. 5 and 6 show another embodiment of the switch 5. FIG. 5 shows a movable contact via a conductive coil spring 58 on a base 57 on which a fixed terminal plate 56 having a fixed contact 55 is fixed. A movable contact plate 60 having 59 is provided. The constant of the coil spring 58 is set to be the same as that of the return spring incorporated in the microswitch of the first embodiment. Then, the action part 9 of the first spring 3 and the action part 11 of the second spring 4 are applied to the movable contact plate 60 in the direction of the arrow. The coil spring 58 may be non-conductive, and a lead wire (not shown) may be connected to the movable contact plate 60.

FIG. 6 shows that the base end of a leaf spring 61 is fixed to the base 57 instead of the coil spring 58 and connected to the terminal 62, and a movable contact 59 is provided at the end, and the other parts are the same as FIG.

〔The invention's effect〕

According to the circuit breaker of the present invention, the combined force of the urging force of the first spring interlocked with the ON operation of the first movable contact and the second spring interlocked with the contact operation of the second movable contact. When the first movable contact is in the ON state and the second movable contact is in the contact state, a signal can be obtained from the switch. Therefore, only one switch is required. There is an effect that the space can be reduced, the connection can be simplified, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a remote control circuit breaker to which one embodiment of the present invention is applied, FIG. 2 is a first spring,
FIG. 3 is a perspective view showing a second spring and a switch, FIG. 3 is a cross-sectional view of a remote control circuit breaker in an ON state,
FIG. 4 is a cross-sectional view showing an electric circuit configuration using flexible lead wires, and FIGS. 5 and 6 are cross-sectional views of another embodiment of the switch. 1... First movable contact 2... Second movable contact 3
... A first spring, 4... A second spring, 5.
6 first contact, 7 second contact, 9, 11 operating part, 12 operating part

Claims (1)

(57) [Claims] A first movable contact having a first contact movable between an on-position and an off-position; and a second contact contacting with and separating from the first contact at the on-position. A second movable contact, a first spring whose operating portion is maximally biased at an ON position of the first contact in conjunction with an ON operation of the first movable contact; and A second spring in which an action portion is maximally biased at the contact position of the second contact in conjunction with a contact operation of the movable contact, and a second spring of the action portion and the second spring of the first spring. The sum of the maximum spring force of the first spring and the maximum spring force of the second spring that is greater than the maximum spring force of the first spring and the maximum spring force of the second spring when pressed by the action portion. And a switch having an operation unit having a smaller return force.