JPS6240337Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circuit breaker installed in, for example, an automobile, and more particularly to a circuit breaker that keeps the circuit cut off until it is manually reset.

Circuit breakers installed in automobiles are required to be smaller and simpler in structure than circuit breakers installed in homes due to space, cost, and other considerations.

Conventionally, this type of circuit breaker was a simple one that used the reversal of a bimetal to break the circuit, and when the bimetal cooled down and returned to its original shape, it automatically connected the circuit. It is a premise.

However, if an overcurrent occurs in some electrical devices, it is necessary to keep the circuit shut off until an expert can inspect and determine the cause. In this case, conventional circuit breakers cannot handle the problem.

In the circuit breaker installed inside the house,
The circuit can remain disconnected, but
In addition to the bimetal, it requires a spring, etc., which poses a problem when installing it in a car.

The present invention has been made in view of the above circumstances, and its purpose is to provide a circuit breaker that can interrupt the circuit without requiring any members such as springs.

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

1 and 2 show an example of the circuit breaker of the present invention. Reference numeral 1 in the figure is a housing made of an insulating material, and its base 2
is provided with a bimetal piece 3, a movable terminal 5 that contacts the contact 4 on the free end side of the bimetal piece 3, and a fixed side terminal 6 that is connected to the fixed end side of the bimetal piece 3.

A truncated cone-shaped convex portion 7 is provided on the surface of the bimetal piece 3 opposite to the base by sheet metal processing, and the convex portion 7 is formed to reversely deform when a pressing force of a certain level or more is applied from the outside. There is. The receiving portion 8 of the base 2 that supports the fixed end side of the bimetal piece 3 is connected to the base 2.
is set higher than other parts of the country. The bimetal piece 3 is supported in a cantilevered manner by the receiving portion 8 and the fixed side terminal 6.

A pressing piece 9 provided integrally with the fixed terminal 6 is in contact with the convex portion 7, and applies a predetermined contact pressure to the contact 4 to ensure contact between the contact 4 and the movable terminal 5. Prevents chattering even if vibration is applied from the outside. Further, the pressing piece 9 has a heat dissipation function.

A stopper part 10 is integrally formed in the center of the free end side of the bimetal piece 3 and is bent into a substantially dogleg shape by cutting and raising to give elasticity. This stopper part 10 extends toward the base side of the bimetal piece 3, and as shown in FIG. The deformation force of the bimetal piece 3 becomes large, and the convex part 7 is reversely deformed, so that the contact points 4, as shown in FIG.
When 5 is opened, the pressing force on the stopper part 10 is released, so that the stopper part 10 stands up.

Next, the operation of the above embodiment will be explained.

Under normal conditions, electricity is supplied from the fixed side terminal 6 and the bimetal piece 3 to the movable side terminal 5 through contact between the contact 4 and the movable side terminal 5.

When an overcurrent flows and the bimetal piece 3 is heated to its deformation temperature range, it starts a reversal operation in the direction away from the base 2 using the fixed end side as a fulcrum. With this reversal operation, the convex portion 7 is pressed even more strongly by the fixed pressing piece 9 and is turned over to protrude to the back side of the bimetallic piece 3, and the bimetallic piece 3 released from the pressing force of the pressing piece 9 becomes the second As shown in FIG. 3, it deforms in the direction away from the base 2, the contacts 4 and 5 open, and the stopper part 10 stands up.

After the circuit is cut off, when the temperature of the bimetal piece 3 falls below the deformation temperature range, it starts returning to its original shape. That is, the bimetal piece 3 rotates in a direction approaching the base 2 using the fixed end side as a fulcrum.
However, during this rotational movement, the stopper portion 10, which has not completely returned to its dogleg shape, comes into contact with the base 2 and prevents the bimetal piece 3 from returning. The circuit therefore remains cut off. in this case,
By increasing the height of the receiving portion 8 and increasing the fixing pressure of the fixed side terminal 6, this return operation can be made even more difficult. In the circuit cutoff state, the stopper portion 10 prevents the contact 4 from coming into contact with the movable terminal 5 even if vibration is applied from the outside, so that chattering can be prevented.

When resetting, the stopper portion 10 is bent into a dogleg shape using tools, and the free end side of the bimetal piece 3 is pressed against the base 2.

Note that the stopper portion 10 is set so as not to come into contact with the movable terminal 5 during the above-described operation.
The stopper portions 10 may be formed on both sides of the free end of the bimetal piece 3, as shown in FIG.

The circuit breaker of the present invention is not limited to automobiles, but can be applied to various types of equipment.

As explained above, according to the present invention, the receiving part on the fixed end side of the bimetal piece of the base is set higher than the other parts of the base to support the bimetal piece in a cantilevered manner, and the bimetal piece is supported in a cantilevered manner. A fixed pressing piece is brought into contact with the upper surface, and a stopper part is formed on the free end side of the bimetal piece to prevent the bimetal piece from returning to its original shape when the bimetal piece reverses in the deformation temperature range and returns to normal temperature. Therefore, even if the circuit is cut off and the bimetal piece returns to normal temperature, the cut-off state can be maintained.

Furthermore, it does not require any parts such as springs, has a simple structure, and can be packed compactly.
There is no risk of cost increase.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a plan view, Fig. 3 is an explanatory diagram of the operation when the circuit is broken, and Fig. 4 is a plan view showing another embodiment. 2 ... base, 3 ... bimetallic piece, 4 ... contact, 5 ... movable side terminal, 6 ... fixed side terminal, 10
...Stoppa department.

Claims (1)

[Scope of utility model registration request] A receiving part on the fixed end side of the bimetal piece of the base is set higher than other parts of the base to support the bimetal piece in a cantilevered manner, and a movable contact on the free end side of the bimetal piece is provided on the base side. In a circuit breaker where fixed contacts contact each other at room temperature,
In addition to providing a convex portion on the surface opposite to the base of the bimetal that is reversely deformed when subjected to a large pressing force,
A fixed pressing piece is brought into contact with the upper surface of the convex part, and a cut-out stopper part is provided on the base side of the bimetal piece, which collapses when a pressing force is applied and stands up when the pressing force is released. A circuit breaker characterized by: