Safety switch for power tool

Details Safety switch for power tool Safety switch for power tool

1975-03-17

1977-02-01

Schaefer, Robert K.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 6185, 200321, H01H 320

Patent

active

040063348

ABSTRACT:
This invention teaches an on/off switch design that can be used in electric power tools, where the power is normally off and further cannot be shifted on unless a switch actuating element is first manipulated through two right angle motions according to a predetermined sequence. The subject device has a normally off on/off switch and a switch actuating element that is supported to move against the switch to shift the same on. The actuating element carries a latch that normally holds it in the switch off position. The latch must first be moved laterally against the force of a biasing spring and held there to release the actuating element, and only then can the actuating element be moved at right angle to the latch releasing movement and then depressed, effective to switch the on/off switch on.

REFERENCES:
patent: 3308535 (1967-03-01), Freeman et al.
patent: 3766352 (1973-10-01), Bigley et al.

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