Switch enclosure for hazardous environment having cover removal

Details Switch enclosure for hazardous environment having cover removal Switch enclosure for hazardous environment having cover removal

1975-10-21

1978-05-02

Scott, James R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

70DIG57, 200293, H01H 920

Patent

active

040876616

ABSTRACT:
A simple and economical means for assuring the removal of electrical power from the equipment in an enclosure when in a hazardous environment, and from the enclosure itself, before the enclosure is opened to that environment, by including an arm which in the "On" position of the equipment switch, extends immediately over the head of a bolt whose removal is necessary for opening of the enclosure, and in the "Off" position of the equipment switch is no longer over the head of that bolt.

REFERENCES:
patent: 1142732 (1915-06-01), Schoell
patent: 1337137 (1920-04-01), Kaplan
patent: 1472043 (1923-10-01), Boge
patent: 1595853 (1926-08-01), Canfield
patent: 2237797 (1941-04-01), Snow
patent: 2348393 (1944-05-01), Krieger
patent: 2542332 (1951-02-01), Holmsten
patent: 2855795 (1958-10-01), Beal
patent: 2951138 (1960-08-01), Petrino
patent: 3458226 (1969-07-01), Carlston
patent: 3900740 (1975-08-01), Akimoto et al.
patent: 3914660 (1975-10-01), Stearley

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