Electrical programmer for the automatic control of a household appliance
US4187499A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1977 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Sep 20, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/21004
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.