Safety feature for function control circuit

Details Safety feature for function control circuit Safety feature for function control circuit

1975-05-15

1977-07-12

Schaefer, Robert K.

58 23R, G04B 1927

Patent

active

040345513

ABSTRACT:
A safety feature for a function control circuit particularly adapted for use with timing circuitry adapted to produce a time based signal is provided. A function signal circuit is adapted to produce either a first or a second function selecting signal. A multi-position switch is coupled to the function signal circuit and is adapted to remain in a quiescent position. The multi-position switch is further adapted to be manually displaced in a first direction to effect producing of a first function selecting signal by said function signal circuit and is further adapted to be manually displaced in a direction opposite to said first direction to effect producing by said function signal circuit of a second function selecting signal. An inhibit circuit is coupled to the timing circuit for receiving the time based signal and is also coupled to the function control circuit and multi-position switch and in response to displacement of the multi-position switch in the first direction inhibits producing of the second function selecting signal in response to displacement of said multi-position switch in the opposite direction within a predetermined interval of time after the multi-position switch means is returned from displacement in the first direction.

REFERENCES:
patent: 3691753 (1972-09-01), Kurita
patent: 3756015 (1973-09-01), Saito
patent: 3762153 (1973-10-01), Komiyama
patent: 3871168 (1975-03-01), Maire et al.
patent: 3871169 (1975-03-01), Schwaar

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