Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-11-25
1980-04-01
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6145R, 340 65, 340566, 340571, 340573, 340576, G08B 2100, G08B 1302
Patent
active
041964292
ABSTRACT:
An array of interdigitally related elements are interstitially spaced from one another, with alternate elements in the array connected to a first conductor and the remaining elements in the array connected to a second conductor. A conductive member, such as a metallic ball, is freely movable in two dimensions over the area of the array, electrically coupling and decoupling adjacent elements in the array as it moves. A circuit is connected between the first and second conductors and detects the coupling of and/or decoupling of electrical contact between adjacent elements as the ball moves over the elements, with the frequency of the coupling and/or decoupling being detected to indicate a predetermined motion or absence of motion. The elements may take different configurations for different desired results.
REFERENCES:
patent: 3509298 (1970-04-01), Kirk
patent: 3539740 (1970-11-01), Isenor et al.
patent: 3742478 (1973-06-01), Johnson
patent: 4057791 (1977-11-01), Bimmerle et al.
patent: 4110741 (1978-08-01), Hubert et al.
Seeger Richard T.
Swann III Glen R.
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