Electrified cover safeguard

Details Electrified cover safeguard Electrified cover safeguard

2007-10-16

2007-10-16

Swarthout, Brent A. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C324S457000, C340S686600, C340S650000, C404S025000

Reexamination Certificate

active

11176563

ABSTRACT:
A warning device that turns on a warning light and or a warning sound to indicate when a manhole cover or a service box cover or a metal pole for lights, traffic lights, transformers or others has become dangerously electrically charged. The invention is attached to the frame of a manhole cover, or a service box cover or a metal pole. The light and sound warns people to stay off the covers and their surrounding areas, and the surrounding areas of the metal poles.

REFERENCES:
patent: 4983954 (1991-01-01), Huston
patent: 5200734 (1993-04-01), Lin
patent: 5952820 (1999-09-01), Thrasher et al.
patent: 6600426 (2003-07-01), Sacks et al.
patent: 6788215 (2004-09-01), White
patent: 2004/0080320 (2004-04-01), Golub

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