Safety interlock for overhead projector

Details Safety interlock for overhead projector Safety interlock for overhead projector

1994-02-08

1995-04-25

Tolin, Gerald P.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

200574, 200333, 361616, H01H 922

Patent

active

054101123

ABSTRACT:
A safety interlock for an overhead projector utilizes only one electrical switch to provide the functions of both a conventional power switch and a safety interlock switch. In an operational mode, the switch responds to a cam surface for actuation. In a safety interlock mode, the switch is allowed to rotate in response to forces generated by the cam surface rather than being actuated.

REFERENCES:
patent: Re34396 (1993-10-01), Wollenhaupt
patent: 3632917 (1972-01-01), Norden
patent: 4806710 (1989-02-01), Kalvaitis
patent: 4885436 (1989-12-01), Pham

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