Water supply control apparatus
US4742583A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1986 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Dec 29, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/94116
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A water supply control apparatus includes a flushing device to be supplied with water, a water supply valve for controlling the supply of water to the flushing device, a driving signal generator for selectively generating driving signals of first and second periods, respectively, a sensor responsive to one, at a time, of the driving signals for detecting whether there is a user of the flushing device at one of the first and second periods, to produce a sensor signal selectively including a user-present signal and a user-absent signal of the one period, and a control circuit responsive to the sensor signal for controlling the water supply valve. The control circuit includes a first control section having a switching element responsive to the user-absent signal for issuing a first switching signal to the driving signal generator to generate the driving signal of the first period and responsive to the user-present signal for issuing a second switching signal to the driving signal generator to generate the driving signal of the second period and an output element responsive to the sensor signal for issuing a water supply valve control signal, a second control section responsive to the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.