Hermetically sealed proximity switch

Details Hermetically sealed proximity switch Hermetically sealed proximity switch

1999-06-03

2000-10-03

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

307116, 362120, H01H 900, H01H 3500, H01H 8300, H02B 124

Patent

active

061279102

ABSTRACT:
A magnetic proximity switch comprises an elongated, substantially cylindrical body which houses a switching circuit, said switching circuit closing when a magnetic target passes within a certain range of the switch. This switching circuit preferably comprises two leaf portions hermetically sealed in a glass enclosure within the switch body, a biasing magnet being positioned adjacent one leaf portion for generating a flux that is shared with the one leaf portion, extending the magnetic field toward the end of the switch body and effectively increasing the sensing range of the switch. The switch also is equipped with a plurality of visual indicators, preferably light-emitting diodes, which are illuminated when the switch is closed to provide immediate visual indication as to the position of the switch, regardless of the rotational orientation of the switch.

REFERENCES:
patent: 4316145 (1982-02-01), Tann
patent: 4349814 (1982-09-01), Akehurst
patent: 4378504 (1983-03-01), Yamasaki
patent: 4456834 (1984-06-01), Harris
patent: 4583006 (1986-04-01), Okada
patent: 5043543 (1991-08-01), Weeks
patent: 5473519 (1995-12-01), McCallops
patent: 5688042 (1997-11-01), Madadi
Go Switch--Topworx Product Catalog, pp. 52-71. No Date.
Westlock Valve Monitoring and Control Products Catalog, pp. A52-A55 (1998).
Stonel "Hawkeye" Product Brochure, Pub. No. 4050 (Jan. 1997).
Moniteur "Companion VPT" Product Specification Sheets, Form X1-1098. No Date.

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