Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-07-03
1999-06-22
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
3406863, 340555, 340556, 3406939, 340635, 2505594, 2502084, 2502221, 307117, 307125, 335 17, G08B 2100
Patent
active
059146648
ABSTRACT:
An auxiliary switch provides an output or feedback signal indicative of the position or logical state of a contactor, disconnect or other principal device to which it is coupled. The switch is formed as a modular unit which can be fixed directly to the principal device, and is actuated by movement of elements within the principal device. An optical switch set within the auxiliary switch includes an emitter and detector pair aligned in mutually facing relation. An actuator is movable with the principal device and supports an optical shield. The actuator displaces the shield between a position clear of the optical path and a position interposed between the emitter and detector to change the state of the auxiliary switch. A power supply circuit may be housed within the switch for supplying power to the optical switch and to output circuitry. The device is particularly tolerant to contamination and can reliably output low level logic signals indicative of the state of the principal device.
REFERENCES:
patent: 3446981 (1969-05-01), Ackerman et al.
patent: 4451910 (1984-05-01), Simard
patent: 4698621 (1987-10-01), Masot
patent: 4706073 (1987-11-01), Vila Masot
patent: 5233330 (1993-08-01), Hase
patent: 5493278 (1996-02-01), Mackenzie et al.
patent: 5585678 (1996-12-01), Kijk et al.
Selected pages from Allen-Bradley Industrial Controls catalog; pp. 3-5 and 3-38; believed first published prior to Jul. 3, 1996.
Rudolf F. Graf, Encyclopedia of Electronic Circuits vol. 2, Fig. 89-8: "Siren uses TTL Gates", p. 576, Copyright 1988.
Allen-Bradley Company LLC
Horn John J.
Lee Benjamin C.
Miller John M.
Yoder Patrick S.
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