Circuit breaker

Details Circuit breaker Circuit breaker

2005-08-02

2005-08-02

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means unitary with latch or trip

C335S172000, C335S174000, C335S016000

Reexamination Certificate

active

06924720

ABSTRACT:
A circuit breaker includes a movable contact, a fixed contact, a switching device, a switching operation handle, and an over-current tripping device. The switching device has a switching lever connected to the handle, a toggle linkage having an upper link and a lower link for connecting to the movable contact, a tripping mechanism for activating the toggle linkage in response to over-current, and an operation spring tightly stretched between the switching lever and the toggle linkage. A locking member is provided in the switching device for interconnecting the toggle linkage and the switching lever and for restricting a movement range of the switching lever according to an operational position of the toggle linkage. When main-circuit contact points are stuck, the locking member restricts the movement of the switching lever and prevents the handle from moving to the OFF position.

REFERENCES:
patent: 3560683 (1971-02-01), Maier et al.
patent: 3605052 (1971-09-01), Dimond et al.
patent: 5184717 (1993-02-01), Chou et al.
patent: 5260533 (1993-11-01), Livesey et al.
patent: 5290982 (1994-03-01), Beck et al.
patent: 5296664 (1994-03-01), Crookston et al.
patent: 1-36652 (1989-08-01), None

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