Electrical programmer for the automatic control of a household a

Details Electrical programmer for the automatic control of a household a Electrical programmer for the automatic control of a household a

1977-09-20

1980-02-05

Pitts, Harold I.

Communications: electrical

Systems

Timer control

3403094, H04Q 300

Patent

active

041874994

ABSTRACT:
A programmer for a household appliance, such as a washing machine or a dishwasher, comprises a disk-shaped carrier 41 and a position indicator 43 synchronized therewith, the indicator working into a comparator 36 also receiving a signal pattern from a read-only memory 35 addressed by a counter 30 which advances under the control of a timing circuit. The latter comprises a frequency divider 20, driven by alternating current from a utility network, certain of whose stages work into a set of AND gates 22-24 that are unblocked by signals read out from the memory in various program phases. The incrementation of the program may be temporarily inhibited by additional logical circuitry 80-83 responsive to external parametric conditions, such as the temperature of the liquid level in the controlled appliance. Unwanted phases of a maximum program recorded on the program carrier 41 may be skipped under the control of a plug-in key card 64 or a selector switch 95.

REFERENCES:
patent: 3120652 (1964-02-01), Weighton
patent: 3187318 (1965-06-01), Chapman
patent: 3370289 (1968-02-01), Hedgcock
patent: 3378741 (1968-04-01), Sutton
patent: 3475997 (1969-11-01), Wohlfeil
patent: 3573589 (1971-04-01), Berry
patent: 3752969 (1973-08-01), Kiffmeyer
patent: 3774056 (1973-11-01), Sample
patent: 3826964 (1974-07-01), Byrne

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