Non-contact switch for detecting the presence of operator on pow

Details Non-contact switch for detecting the presence of operator on pow Non-contact switch for detecting the presence of operator on pow

1994-02-01

1995-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

180272, G01V 904

Patent

active

053978900

ABSTRACT:
A non-contact operator present engine cut-off switch includes an emitter for directing a radiated signal away from a control handle on power machinery and a detector positioned to receive the radiated, reflected signal from the hand of an operator in order to detect the operator presence in an operating zone to permit operation of the power machinery. The non-contact sensing circuitry may be hermetically sealed to protect the circuitry from adverse environmental conditions.

REFERENCES:
patent: 4029957 (1977-06-01), Betz et al.
patent: 4210905 (1980-07-01), Coons
patent: 4281734 (1981-08-01), Johnston
patent: 4868912 (1989-09-01), Doering
patent: 4941854 (1990-07-01), Takahashi et al.
patent: 4972070 (1990-11-01), Laverty
patent: 4973834 (1990-11-01), Kim
patent: 4973837 (1990-11-01), Bradbeer
patent: 5103085 (1992-04-01), Zimmerman
patent: 5138150 (1992-08-01), Duncan

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