Door interlock for electrical apparatus

Details Door interlock for electrical apparatus Door interlock for electrical apparatus

1982-04-01

1983-09-20

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 920

Patent

active

044058446

ABSTRACT:
A door interlock for electrical apparatus, which may include a switch, within an enclosure, permits the door of the enclosure to be opened only if the electrical apparatus is in a predetermined condition, such as switch-closed. Once the switch has been opened, the door may be opened. The interlock prevents the switch from being reclosed as long as the door is open. A latch holds the door closed if the switch is closed, if the door is locked closed by a door lock, or if both conditions obtain. If the switch is opened while the door is locked closed by the door lock, the latch continues to latch the door closed. If the door lock is unlocked while the switch remains closed, the door latch likewise latches the door closed.

REFERENCES:
patent: 3296393 (1967-01-01), Rimmer et al.
patent: 3385938 (1968-05-01), Schockelt
patent: 3991291 (1976-11-01), McGuffie et al.

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