Field sensor

Details Field sensor Field sensor

1978-05-24

1980-12-23

Silverstrim, John P.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 56, 340562, B66B 1306

Patent

active

042405289

ABSTRACT:
A field sensor control mechanism for doors and the like has two or more insulated electrodes mounted at different levels in the leading edge of a door or the like. A first oscillating circuit is connected with one of these electrodes and a second oscillating circuit, separate from the first one and serving as a comparison circuit for the same, is connected to the other electrode. The two circuits have base oscillating frequencies which are either identical or differ only slightly from one another. The circuits are so coupled to one another that the oscillations of the first circuit vary as a function of capacitance changes taking place in the electrodes.

REFERENCES:
patent: 2720284 (1955-10-01), Galanty
patent: 3018851 (1962-01-01), Diamond
patent: 3370677 (1968-02-01), Federmann

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