Inherently deployable warning to alarm of an opening into...

Details Inherently deployable warning to alarm of an opening into... Inherently deployable warning to alarm of an opening into...

2006-03-07

2006-03-07

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S540000, C040S608000, C116S270000

Reexamination Certificate

active

07009513

ABSTRACT:
A signal to warn of the open condition of a sub-grade vault whose lid may be open or missing. A spring-loaded placard is held down in the vault by a closed lid and raises above the opening by its own stored energy when the lid is open or missing.

REFERENCES:
patent: 4019271 (1977-04-01), Latimer
patent: 6095081 (2000-08-01), Gochenour
patent: 6149340 (2000-11-01), Pateman
patent: 6305312 (2001-10-01), Bent et al.
patent: 2004/0244670 (2004-12-01), Young

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