Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1990-09-11
1992-09-29
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 2, 361 93, H01H 930
Patent
active
051518406
ABSTRACT:
A circuit for the protection the contacts of a switch device such as a reed switch when used in a control circuit. The protection circuit isolates the switch contacts from the load it is controlling by establishing parallel electrical current paths between two inputs. Two such parallel paths provide for a symmetrical bi-directional current flow within the protection circuit. Each parallel path contains a controlled switching device which conducts the current in the respective parallel path when the input polarity is in a given direction. The controlled switching device may be controlled from a polarity sensing in the primary branch which contains the switch device. A single parallel path between inputs can be used to provide polarized DC operation. Diodes in the primary path containing the switch device provide for polarity sensing for control of the controlled switch devices in the parallel paths.
REFERENCES:
patent: 3330992 (1964-11-01), Perrins
patent: 4656554 (1987-04-01), Maschek et al.
Electronic Industries Association, Engineering Department, EIA Standard RS-421-A, dated Mar., 1983, pp. 36-42.
PHD, Inc., Catalog No. 917D, "Proximity Switches for Tom Thumb Cylinders and PHD Actuators", p. 7.
Aleph International Corporation, undated catalog, "Magnetic Reed Switches".
Parker Cylinder Division, Catalog No. 0960, "Stainless Steel Body Air Cylinders", Nov., 1987, p. 31.
Aeroquip Corporation, Bulletin 4100A, "Series TP Proximity Switches", dated Mar. 1987, pp. 4 and 5.
W. Gunther GmbH, Catalog, "Reed Switches", dated Oct. 1986, pp. 22 and 23.
Hasco Components Inc., Catalog, "OKI Reed Switches", printed in Japan in 1987, (1 page).
Pellinen A. D.
RAJ Industries, Inc.
Schultz C.
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