Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1990-04-26
1993-05-18
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
192131R, 307328, 361280, H01H 926, H01H 3600
Patent
active
052126218
ABSTRACT:
A control station for a machine is equipped with capacitive proximity sensors in two locations for sensing the presence of operator's hands at the locations. The sensors are enclosed in a protective housing behind exterior target surfaces forming exterior wall surfaces of the enclosure and are supplied by a voltage source. A relay in series with each sensor and the voltage source is actuated when the operators hands are both sensed. Each sensor generates an electrical field extending outwardly a predetermined distance forwardly beyond each target surface for sensing an operators hands which are outside the enclosure within the field and need not be in tactile contact with the target surfaces. Only when both hands are sensed do the relays indicate operation of the machine.
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patent: 4304976 (1981-12-01), Gottbreht et al.
patent: 4412268 (1983-10-01), Dassow
patent: 4486811 (1984-12-01), Kamiya et al.
patent: 4760490 (1988-07-01), Murao
patent: 4918560 (1990-04-01), Storer
CNC Retrofits, Inc.
Osborn David
Pellinen A. D.
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