Trigger switch

Details Trigger switch Trigger switch

1984-07-30

1987-05-19

Pellinen, A. D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

307119, 307140, 200157, 173170, H02H 100

Patent

active

046671196

ABSTRACT:
A trigger switch for use with hand held power tools includes a trigger which is movable in response to finger pressure thereon. A pair of normally open switch contacts are closed when finger pressure in excess of a first threshold pressure is applied to the trigger. In the event the applied finger pressure exceeds a second, greater threshold pressure, the switch contacts are opened to deactuate the tool. An insulating member shields the switch contacts when the second threshold pressure is exceeded to prevent closure of the contacts upon release of the trigger. A second set of switch contacts, closable in response to finger pressure in excess of the second threshold, may be provided to control actuation of an electrical tool brake mechanism.

REFERENCES:
patent: 1702245 (1929-02-01), Black et al.
patent: 1720541 (1929-07-01), Coates
patent: 1741406 (1929-12-01), Decker
patent: 4006333 (1977-02-01), Halts
patent: 4063600 (1977-12-01), Krzes
patent: 4523065 (1985-06-01), Heggelund
patent: 4549097 (1985-10-01), Ulmer

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