Pretravel switch for portable tools

Details Pretravel switch for portable tools Pretravel switch for portable tools

1974-10-09

1976-06-01

Hohauser, Herman

Electricity: circuit makers and breakers

Liquid contact

Time delay

200153V, H01H 1308

Patent

active

039611469

ABSTRACT:
A trigger switch for a portable electric tool providing substantial pretravel of the trigger before closing force is applied to the contacts. This is a safety measure to prevent the motor from starting if the trigger should be accidentally pressed in handling a circular saw or the like. The pretravel is provided by a telescopic joint between the trigger and contact carrier, each of which is biased independently by a return spring to insure immediate reopening of the contacts upon release of the trigger.

REFERENCES:
patent: 3485975 (1969-12-01), Long
patent: 3646298 (1972-02-01), Weber et al.
patent: 3673365 (1972-06-01), Schadow
patent: 3766348 (1973-10-01), Johnson
patent: 3773997 (1973-11-01), Evans et al.
patent: 3790730 (1974-02-01), Wyland

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