Safety devices

Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection

Patent

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Details

361 50, 361104, 307116, 307118, 337190, H02H 316

Patent

active

047516038

ABSTRACT:
Hand-held electrical apparatus having an electrical detector in the form of a conductive sensor adjacent to any exposed electrical part so that if the apparatus becomes wet or damp the water will form path of conduction between the exposed electrical part and the sensor. A conductive path from the sensor forming part of the supply lead to the plug, and the plug comprising normally closed mechanical switch at least in the live line from the mains supply to the supply lead to the apparatus and a control circuit connected to the said sensor by the conductive path which open the switch as a result of the conductive path having been formed from the exposed electrical part because of the presence of moisture. The switch comprises a length of wire holding electrical contacts closed against the action of a spring. The control circuit fuse the wire, however, to allow the spring to open the contacts when the conductive path is established. A circuit board is slidably mounted in the plug and carries one of the pair of electrical contacts and the components of the control circuit, the wire holding the circuit board against the action of the spring to keep the mechanical switch in its closed position.

REFERENCES:
patent: 3477054 (1969-11-01), Bramhall et al.
patent: 3493815 (1970-02-01), Hurtle
patent: 4169261 (1979-09-01), Alpaugh
patent: 4219857 (1980-08-01), Haraldsson et al.
patent: 4270158 (1981-05-01), Gillardoni
patent: 4464582 (1984-08-01), Aragaki et al.
patent: 4550358 (1985-10-01), Crowley et al.

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