Explosion proof and watertight enclosure with inspectable means

Details Explosion proof and watertight enclosure with inspectable means Explosion proof and watertight enclosure with inspectable means

1975-11-14

1976-08-17

Hall, George T.

Receptacles

Outlet or junction box type

With closure

220 394, 220 88R, 220327, 174 50, H02G 308

Patent

active

039749339

ABSTRACT:
When electrical equipment is used in a hazardous atmosphere, it must be enclosed in an explosion proof enclosure so an electrical spark cannot cause a fire or explosion. The present invention provides a means for assuring that an explosion proof enclosure which has been opened for inspection, repair or adjustment of the electrical apparatus is restored to its original condition. To this end, a visually inspectable locking means is provided. The locking means can be engaged only when the enclosure compartment and its associated cover are restored to their original explosion proof relationship. The locking means does not exert any distorting force on the mating threads of the enclosure.

REFERENCES:
patent: 3317072 (1967-05-01), Zavertnik et al.
patent: 3430799 (1969-03-01), Maier
patent: 3724706 (1973-04-01), Slocum

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