Electrical proximity switch arrangements

Details Electrical proximity switch arrangements Electrical proximity switch arrangements

1975-04-08

1977-08-30

Scott, James R.

Electricity: circuit makers and breakers

Special application

200293, 200DIG1, H01H 3500, H01H 900

Patent

active

040456293

ABSTRACT:
An arrangement for modular mounting of a plurality of proximity switches comprises a plate of insulating material having a plurality of first conductive plates mounted on its front face. A respective housing containing a switch circuit is replaceably mounted to the rear face of the plate of insulating material in correspondence with each first conductive plate. Each housing contains a second conductive plate which, in conjunction with the associated first conductive plate, forms a parallel-plate capacitor. The dielectric of the capacitor is formed by the plate of insulating material, a flat wall of the housing which the second conductive plate lines, and an air gap between the plate and the flat wall. Touching of the second plate by a user varies the capacity of the capacitor thus generating a signal operating the circuit within the housing. Since the two plates of the capacitor are mutually isolated, the user cannot experience an electric shock. The housing may be mounted in the rear face of the plate of insulating material either direct or by way of an intermediate supporting frame.

REFERENCES:
patent: 2525769 (1950-10-01), Bruns
patent: 2659533 (1953-11-01), Quinby et al.
patent: 3281541 (1966-10-01), Learner
patent: 3307071 (1967-02-01), Diamond
patent: 3339050 (1967-08-01), Mitchell
patent: 3492440 (1970-01-01), Cerbone et al.
patent: 3492440 (1970-01-01), Cerbone et al.
patent: 3562468 (1971-02-01), Stefani
patent: 3668698 (1972-06-01), Demirdjioghlou et al.
Hoberman, Stu; Popular Science, Electronics Section, "Touch Module--This New Version Does Many Jobs"; pp. 124, 125; Feb. 1973.

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