JP2566434Y2 - Screwless terminal structure of breaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwless terminal structure of a circuit breaker which does not use a screw for connecting an electric wire, and particularly to a structure in which an electric wire is locked and pressed to a fixed terminal by a metal fitting.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, for example, a lever 14 is rotated to push down an upper movable piece 2a, and an electric wire 10 is connected to a fixed terminal 15 by a locking press fitting 12. Therefore, whether or not the electric wire has been securely inserted into the terminal depends on the experience and intuition of the operator.

[0003]

As described above, in the conventional structure, it is not possible to determine whether or not the wire has been securely inserted into the terminal. Therefore, even if the connection is poor, the circuit breaker is used as it is. This may cause the reliability of the circuit breaker to deteriorate, for example, the electric wire may be disconnected later, which may cause the power supply to stop.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a terminal structure which cannot be locked and pressed unless an electric wire is inserted into the terminal. That is, a movable body to which the locking press fitting is fixed so that the tip thereof faces the surface side of the fixed terminal, a lever capable of lowering the movable body to the wire locking press contact position and locking the position, A push-back spring that pushes the movable body back to a position before descending, and prevents the movable body from descending, and comes off the descending prevention position by a contact operation of the inserted wire tip, and before the movable body descends. And a descent-preventing mechanism provided at the end of the wire insertion path with a descent-preventing member that returns to the descent-preventing position in response to the return to the position.

[0005]

When the electric wire is not inserted to the end of the wire insertion path, that is, when the electric wire is not inserted to a position where it comes into contact with the descent prevention member, the movable body is prevented from descending by the descent prevention member. The lock cannot be pressed. However, when the electric wire is inserted to the end and the descent prevention member comes out of the descent prevention position, the movable body can be lowered, the movable body is lowered by lever operation, and the electric wire is locked and pressed by the locking press fitting, and fixed. Connected to terminal.
Further, when the lever is returned and the movable body returns to the position before the descent, the descent prevention member returns to the descent prevention position accordingly. Therefore, the wire cannot be locked and pressed unless the wire is inserted up to the end of the wire insertion path, so that there is no halfway connection. In addition, it is possible to easily return to the connection preparation state.

[0006]

1 and 2 are explanatory views showing an embodiment of a screwless terminal structure (hereinafter referred to as a terminal structure) of a circuit breaker according to the present invention. Hereinafter, the present invention will be described with reference to these drawings. FIG. 1 is an explanatory view of the terminal structure seen through from the right side. An electric wire insertion path 9 is formed from the outside of the circuit breaker body to the inside, and the fixed terminal 3 is attached to the lower side thereof. Reference numeral 2 denotes a movable member which is an example of a movable body, is formed in a substantially U shape, and includes an upper movable piece 2a and a lower movable piece 2b. A lock press fitting 5 is attached to the bottom surface of the upper movable piece 2a with its tip downward, and the lower movable piece 2b and the base 8 are attached.
A push-back spring 6 is interposed between them. Reference numeral 5a denotes a lock piece for preventing the wire from coming off, and reference numeral 5b denotes a press-contact piece for pressing the wire. Reference numeral 4 denotes a lock rod, which is an example of a descent-preventing member constituting a descent-preventing mechanism, and is attached to the end of the wire insertion path 9 by a rotating shaft 4a, and supports the upper movable piece 2a from below so as to prevent the descent thereof. doing. Further, it is urged toward the wire insertion side so as to return to the original position by the urging spring 7 constituting the descent prevention mechanism. Reference numeral 1 denotes a lever, which is attached by a rotation shaft 1a, so that the upper movable piece 2a can be pressed down by pressing the cam surface 1b during rotation.

Next, the operation of the terminal structure of the present invention in the case of actually connecting electric wires will be described with reference to FIG. When the electric wire 10 is inserted into the electric wire insertion path 9, the electric wire advances to the terminal end while bending the lock piece 5 a and the press contact piece 5 b inward, that is, being pressed against the fixed terminal 3, and contacts the lock rod 4.
When the lock rod 4 is further advanced, the lock rod 4 rotates against the urging force of the urging spring 7, and the support of the upper movable piece 2a is released. Thereby, the upper movable piece 2a can be lowered, and the lever 1
Is rotated, the upper movable piece is pressed down by the pressing action of the cam surface 1b, and the chain
0 is pressed in a chain. At this time, the push-back spring 6 is compressed by the lower movable piece descending. As described above, the lever cannot be rotated unless the electric wire is inserted to the position where the support of the lock rod is released, that is, the end of the electric wire insertion path. Therefore, the electric wire can be securely connected to the fixed terminal, and no connection failure occurs.

Next, when the lever 1 is rotated to the origin, the lower movable piece 2b is pushed back by the push-back spring 6, and in conjunction with this, the upper movable piece 2a returns to the origin, and the wire can be disconnected. Become. At this time, the lock rod 4 is also returned to the original position by the urging spring 7, and is again in a state of supporting the upper movable piece 2a. Therefore, the electric wire can be easily removed, and the initial connection preparation state can be obtained.

3 and 4 show a modified embodiment of the terminal structure according to the present invention. At the end of the wire insertion path 9, a lock rod 11, which is an example of a descent prevention member constituting a descent prevention mechanism, is attached by a rotation shaft 11a. A locking piece 11b is formed on the lock rod 11, and the locking piece locks the lower end of the lower movable piece 2b at the terminal end so that the lower movable piece is prevented from descending. Then, as shown in FIG. 4, when the lock rod 11 is rotated by inserting the electric wire to the end, the engagement with the lower movable piece 2b is released. By pressing down, the wire can be locked and pressed. When the lever is rotated to the origin, the lower movable piece 2b returns to the original position by the restoring force of the push-back spring 6, and at this time, the lock rod 11
Is also returned to the home position by the biasing spring 12, and is in the initial locked state. As described above, unless the electric wire is inserted to the end, it is impossible to lock and press the wire. Also, the initial connection preparation state can be easily achieved.

In the above embodiment, the lowering prevention mechanism is described as being rotatable and returning to the original position by a spring.
It is also possible to use a mechanism in which one end of the lowering prevention member itself is formed of a spring material to have flexibility by fixing one end thereof, so that the lowering prevention member can return to the lowering prevention release direction and the lowering prevention position.

[0011]

[Effects of the Invention] By using the screwless terminal structure of the circuit breaker according to the present invention, it is possible to eliminate poor connection of electric wires. Therefore, the electric circuit is not interrupted due to the poor connection, and the reliability of the circuit breaker is greatly improved. Thus also,
The initial connection state can be easily set. As described above, the present invention is a breakthrough that can dramatically improve the reliability of the circuit breaker and the wiring work efficiency.

[Brief description of the drawings]

FIG. 1 is a right side perspective view of a screwless terminal structure of a circuit breaker according to the present invention.

FIG. 2 is an explanatory view of a state in which the support of the lock rod is released and the electric wire is locked and pressed;

FIG. 3 is a right side perspective view of a modified embodiment.

FIG. 4 is an explanatory view of a state in which an electric wire is locked and pressed in a modified example.

FIG. 5 is an explanatory view of a screwless terminal structure of a conventional circuit breaker.

[Explanation of symbols]

1, 14 lever, 2 movable body, 2a upper movable piece, 2b lower movable piece, 3, 15 fixed terminal, 4,
11 ··· Lock bar, 5,12 ·· Locked metal fitting, 5a ·
・ Locking piece, 5b ・ ・ Press-contact piece, 6 ・ ・ Push-back spring, 7, 1
2 · · · biasing spring, 8 · · base, 9 · · wire insertion path, 10
..Wires, 13 ... leaf springs.

Claims (1)

(57) [Scope of request for utility model registration] 1. A screwless terminal structure of a circuit breaker for connecting an electric wire inserted along a fixed terminal to an electric wire insertion path having a fixed terminal to said fixed terminal by locking and pressing a locking press fitting. A movable body to which the metal fitting is fixed so that the tip thereof faces the surface side of the fixed terminal, a lever capable of lowering the movable body to the wire lock pressing position, and a lockable position thereof, and lowering the movable body A push-back spring that pushes back to a previous position to prevent the movable body from descending, and to come out of the descending prevention position by a contact operation of the inserted wire tip, and to return the movable body to a position before descending. And a descent-preventing mechanism provided at the end of the wire insertion path with a descent-preventing member that returns to the descent-preventing position in response to the screw-less terminal structure of the circuit breaker.