JPH03266329A - Circuit breaker - Google Patents

Abstract

PURPOSE:To require only one switch so as to make a storage space of an appliance stand small by driving a switch with compounded forces of two springs. CONSTITUTION:An operational part 12 which is pushed to a working part 9 of a first spring and a working part 11 of a second spring and which has a returning force smaller than the total of each maximum spring force of the first spring and the second spring is installed in a switch 5. With this structure, the first spring interlocks with the on-operation of a first movable contactor and the second spring interlocks with the contact operation of a second movable contactor and at the time the first and the second contactors contact each other, the first spring and the second spring 4 respectively is energized to maximum potential energy. Since each spring force is added to the operational part 12 of the switch 5 through the working parts 9, 11, the operational part 12 is pushed and the switch 5 starts to work. As a result, a signal showing the contacting state is obtained. Consequently, the storage space of the appliance stand is made small and line connection is simplified. Moreover, only one switch is enough.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit breaker of a remote control type or the like.

[Conventional technology]

A circuit breaker whose contact portion is composed of a pair of movable contacts, for example, a first movable contact is operated by a handle,
There is a remote control type circuit breaker in which a second movable contact is operated by an electromagnet independently of the first movable contact.

However, there is a problem in 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 location.

Therefore, an on-signal extraction 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.

[Problem to be solved by the invention]

However, since this circuit breaker had a switch for each movable contact, it required a large storage space for the switch in the device stand, and had the disadvantage of requiring many connections, reducing reliability. .

Therefore, an object of the present invention is to provide a circuit breaker which can reduce storage space, simplify wiring connections, and improve reliability.

[Means to solve the problem]

The circuit breaker of the present invention includes a first movable contact having a first contact movable between an on position and an off position;
a second movable contact having a second contact that comes into contact with and separates from the first contact in the on position; and a second movable contact in the on position of the first contact in conjunction with the on operation of the first movable contact. a first spring whose acting portion is urged to the maximum; and a second spring whose acting portion is urged to the maximum at the contact position of the second contact in conjunction with the contact operation of the second movable contact. the spring, and is pressed by the acting portion of the first spring and the acting portion of the second spring to be greater than the maximum spring force of the first spring and the maximum spring force of the second spring. Moreover, the switch includes an operating portion having a return force smaller than the sum of the maximum spring forces of the first spring and the second spring.

[Effect]

According to the configuration of the present invention, the first spring is interlocked with the ON operation of the first movable contact, the second spring is interlocked with the contact operation of the second movable contact, and the first spring is interlocked with the ON operation of the first movable contact. When the movable contact and the second movable contact are in contact, the first spring and the second spring are each biased to the maximum, and each spring force is applied from the acting part to the operating part of the switch, so that the operating part is pressed. The switch operates, thereby providing a signal indicating that it is in contact. Therefore, since only one switch is required, the storage space of the instrument stand can be reduced, wiring can be simplified, and reliability can be improved.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 4. That is, this circuit breaker includes a first movable contact 1, a second movable contact 2, a first spring 3, a second spring 4, and a switch 5.

The first movable contact 1 is in the ON position! and an off position. The first movable contact 1 is pivotally supported by a fixed shaft 13 of a device stand 14 as shown in FIG.
The contacts are biased to open by a contact pressure/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. The second movable contact 2 is the third
As shown in the figure, a shaft portion 17 at one end of the L-shaped arm 16
A contact pressure spring 18 is interposed on the side opposite to the second contact 7 with respect to the shaft portion 17 . The bent portion of the arm 16 is pivotally supported by a fixed shaft 20 of the instrument stand 14.

The action portion 9 of the first spring 3 is biased to the maximum when the first contact 6 is in the on position in conjunction with the on operation of the first movable contact 1 . The first spring 3 is formed of a wire spring having a winding part 19 in the middle part, and the winding part 19 is supported by a fixed shaft 21.
A bent portion at one end serves as an engaging portion 8 that engages with a receiving portion 22 of the first movable contact 1 .

The action portion 11 of the second spring 4 is maximally biased 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 part 23 in the middle part, the winding part 23 is supported by a fixed shaft 24, and the bent part at one end is connected to the part 26 for receiving the second movable contact 2. It is a retaining part lO that engages.

The switch 5 is pressed by the action part 9 of the first spring 3 and the action part 11 of the second spring 4, and the switch 5 is pressed by the action part 9 of the first spring 3 and the action part 11 of the second spring 4, so that the switch 5 has a force greater than the maximum spring force of the first spring 3 and the maximum spring force of the second spring 4. The operating portion 12 is large and has a return force smaller than the sum of the maximum spring forces of the first spring 3 and the second spring 4. The switch 5 is a microswitch as an example, and the other end of the first spring 3 which becomes the action part 9 and the other end of the second spring 4 which becomes the action part 11 are engaged with the operating part 12 thereof.

The return force of the operating unit 12 built into the microswitch is applied by a return spring, and the maximum spring force of the first spring 3 and the second movable contact 2 when the first movable contact 1 is in the on state are is set to be larger than the spring force of the second spring 4 when in the contact state, but smaller than the total spring force.

Reference numeral 29 is a terminal of the switch 5, and a lead wire drawn out to the outside is not shown.

This switch 5, a fixed shaft 21 supporting the first spring 3,
The fixed shaft 24 supporting the second spring 4 is provided with an insulating plate 27.
is provided on one side of the first movable contact 1 and the second movable contact 2. This facilitates assembly into the device stand 14 and electrically and mechanically isolates the switch 5 side and the first movable contact 1 side. 28 is a through hole through which the fixed shaft 13 passes.

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

The mechanism section 32 has a trip link 35 that responds to the operation of the abnormal current detection means 34, and a launch link 36 that is latched to the trip link 35. When the launch link 36 is latched to the trip link 35, the first has a handle 37 for turning the movable contact 1 on or off, and when the latch link 36 is removed from the trip link 35 in the ON state of the first movable contact 1, the first movable contact 1 is turned on or off. Open the trip. 35a is trip link 3
5, a latch part, 35b is a return spring of the trip link 35, 35c is a fixed shaft of the trip link 35, 36a is a locking part of the latch link 36 that is latched by the latch part 35a,
37a is a handle return spring, 37b is a fixed shaft of the handle 37, 38 is a slit formed in the launch link 36,
39 is a movable shaft that slides through the slit 38; 4o is a first link that connects the handle 37 and the movable shaft 39; 41 is a second link that connects the movable shaft 39 and the first movable contact 1;
41a is a connecting shaft.

The abnormal current detection means 34 includes a short circuit sensor 42 made of an electromagnet and an overcurrent sensor 43 made of a bimetal.

The electromagnet 33 that operates the second movable contact 2 is a bistable type with a polarity, and a plunger 44 is connected to the other end of the arm 16 by a connecting shaft 47 to control the contact position and opening of the second movable contact 2. Hold each remote position at a stable position. Reference numeral 45 denotes an assisting spring that urges the plunger 44 in the direction of contact with the second movable contactor 2, and 46 denotes! This is a lead wire that inputs an operation signal to the magnet 33.

Figure 4 shows the electrical circuit configuration, with the power supply side terminal 30 and the
is connected to the movable contact 2 by a flexible lead wire 48,
The first movable contact 1 and the overcurrent sensor 43 are connected to the frame 4
The overcurrent sensor 43 and one end of the coil 51 of the electromagnet 42 are connected to each other by a flexible lead wire 50 via a flexible lead wire 50 , and the other end of the coil 51 is connected to the load side terminal 31 . , the first contact 6 and the second contact 7
An electric path is constructed between the load side terminal 31 and the power supply side terminal 30 via the load side terminal 31 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 When the movable contact 1 and the second movable contact 2 are in contact, the first spring 3 and the second spring 4 are biased to the maximum, and each spring force is applied to the switch 5 from the acting portion 9.11. In order to join the operation section 12,
When the operating portion 12 is pressed, the switch 5 is operated, thereby obtaining a signal indicating that it is in a contact state. Therefore, the storage space of the instrument stand 14 can be reduced, wiring can be simplified, and since there is only one switch 5, reliability is high.

5 and 6 show other embodiments of the switch 5. In FIG. 5, a movable contact is connected to a base 57 to which a fixed terminal plate 56 having a fixed contact 55 is fixed via a conductive coil spring 58. A movable contact plate 60 having 59 is provided. The spring constant of the coil spring 58 is set to be the same as the return spring built into the microswitch of the first embodiment. Then, the acting portion 9 of the first spring 3 and the second
The acting portion 11 of the spring 4 is applied to the movable contact plate 60 in the direction of the arrow. Note that a non-conductive coil spring 58 may be used and a lead wire (not shown) may be connected to the movable contact plate 60.

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

〔Effect of the invention〕

According to the circuit breaker of the present invention, the combined force of the biasing force of the first spring that is interlocked with the ON operation of the first movable contact and the biasing force of the second spring that is interlocked with the contact operation of the second movable contact. Since the switch is actuated by the switch, a signal can be obtained from the switch when the first movable contact is on and the second movable contact is in contact, and therefore only one switch is required.
This has the effect that the storage space of the instrument stand can be reduced, wiring can be simplified, and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a remote control type circuit breaker to which an embodiment of the present invention is applied, and FIG. 2 is a sectional view of a first spring;
A perspective view showing the second spring and the switch; FIG. 3 is a sectional view of the remote control circuit breaker in the on state;
FIG. 4 is a sectional view showing a t-way configuration using flexible lead wires, and FIGS. 5 and 6 are sectional views of other embodiments of the switch. DESCRIPTION OF SYMBOLS 1... 1st movable contact, 2... 2nd movable contact, 3... 1st spring, 4... 2nd spring, 5...
switch, 6... first contact, 7... second contact,
9.11...Action part, 12...Operation part l:7a'''' Taste

Claims (1)

[Claims] a first movable contact having a first contact movable between an on position and an off position; and a second movable contact having a second contact that contacts and separates from the first contact in the on position. With a child
a first spring whose operating portion is maximally biased when the first contact is in the on position in conjunction with the on operation of the first movable contact; and a first spring that is interlocked with the contact operation of the second movable contact. a second spring whose acting portion is maximally biased at the contact position of the second contact; and a second spring which is pressed by the acting portion of the first spring and the acting portion of the second spring. It has a return force that is greater than the maximum spring force of the first spring and the maximum spring force of the second spring, and smaller than the sum of the respective maximum spring forces of the first spring and the second spring. A circuit breaker comprising a switch having an operation part.