Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-09-12
1991-12-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
G01V 904, G06M 700, H01J 4014
Patent
active
050774670
ABSTRACT:
A hand operated photoelectric switch having a channel providing an interrupt area for an operator's hand to pass into the path of an infrared light beam passing from a light emitting diode to a phototransistor sensor. Said housing further including circuitry for operating a mechanical relay to be activated for the operation of electrical machinery. A monitoring circuit is provided to monitor the light emitting diode and a driver transistor for the mechanical relay whereby to detect the failure of either one and disable the circuit from accidentally providing contant closure of the mechanical relay.
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Barron, Jr. Kenneth L.
Williams, Jr. Staton P.
Lee John R.
Nelms David C.
Triad Controls, Inc.
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