Control-safe capacitive switch

Details Control-safe capacitive switch Control-safe capacitive switch

1991-11-29

1993-08-03

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307328, 192129R, H01H 3500, F16D 900

Patent

active

052332314

ABSTRACT:
A palm-button control system provides for machinery control with minimized operator hand pressure by use of capacitive switches and reduced susceptibility to radio frequency interference. The system employs first and second capacitive palm-button switches, both of which must be contacted before machinery is activated. Each capacitive palm-button includes a radio frequency sensor which functions to disable machine activation in the presence of a sufficiently strong radio signal. Circuitry for periodically testing the radio frequency sensors provides periodic visual operator feedback indicative of operability of the system. All controls are synchronized or enabled in accordance with a series of digital pulses.

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patent: 4794273 (1988-12-01), McCullough et al.
patent: 5168173 (1992-12-01), Windsor
P+F Proximity Sensors, Pepperl + Fuchs Inc. Catalog (Copyright 1989) pp. 112-124.

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