Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Instruments and devices for fault testing
Patent
1993-05-13
1995-02-28
Regan, Maura K.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Instruments and devices for fault testing
340632, 361104, 439621, G01R 2700, H02H 504
Patent
active
053940946
ABSTRACT:
Portable gas sensing devices practicing the present invention include a fault protective battery cap to interrupt flow of battery current exceeding a preselected-threshold level. In normal operation, the battery cap is engaged with a compartment of the gas sensing device which maintains the battery used to power gas sensing circuitry therein. When installed in the gas sensing device in this manner, the battery cap defines a current path from at least one terminal of the battery to internal gas sensing circuitry. As with prior art battery caps, the battery cap of the invention is removable to facilitate replacement of the battery. Unlike prior art battery caps, however, battery caps constructed in accordance with the invention include a fuse electrically connected interposing the current path. The fuse functions to interrupt current flow from the battery if the current exceeds a preselected threshold level. In presently preferred embodiments, the battery cap is constructed of a generally nonconductive polymeric material which encapsulates a subminiature resistive fuse such that gas from the surrounding atmosphere is incapable of contacting the fuse.
REFERENCES:
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patent: 4134112 (1979-01-01), Kercheval et al.
patent: 4255698 (1981-03-01), Simon
patent: 4721862 (1988-01-01), Cooper
patent: 5070427 (1991-12-01), Bush
patent: 5136452 (1992-08-01), Orton
patent: 5237302 (1993-08-01), Harris
Industrial Scientific Corporation
Regan Maura K.
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