Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-03-18
1985-02-26
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
307116, 340518, 340680, G08B 2100, G08B 1326
Patent
active
045020426
ABSTRACT:
A multi-position proximity switch having a plurality of binary outputs, each output indicating whether the distance between an object and a field transducer exceeds a corresponding one of a plurality of predefined distances. The sensitivity of a proximity detector having a single binary output is stepped through a plurality of adjustable levels by a digital counter having decoded outputs and the binary output of the proximity switch is sampled after the decoded counter outputs change state so that a plurality of binary outputs, each associated with a detector sensitivity level and a corresponding distance, are provided. The failure of the greatest distance to be detected or the detection of the smallest distance activates an alarm indicating that the object is outside a permissible range of distances.
REFERENCES:
patent: 3514627 (1970-05-01), Bridgeman
patent: 3747085 (1973-07-01), Bala et al.
patent: 4121204 (1978-10-01), Welch et al.
"Proximity Control Brochure, PR151 Series Control," EDR Electronics (2285 Mt. Prospect Road, Des Plaines, IL 60018).
Kistner Werner
Wuhrl Arno
M.A.N.--Roland Druckmaschinen Aktiengesellschaft
Swann III Glen R.
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