Automatic fluid-flow control system
US4984314A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Apr 21, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03C1/057
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system for controlling liquid flow in bathrooms and the like in response to the presence of the user, which is configuration-adjustable to permit use in preselected sanitary applications. A light emitting device cooperates with a light sensor to detect light reflected from the user. The filtered and amplified output signal from the sensor is demodulated to provide a DC output signal. A first circuit is responsive to the DC output signal acutate fluid flow for a maximum preselected period, to enable use in controlling faucet flow. A second circuit is responsive to the DC signal and includes a device for arming the circuit following the existence of the DC output signal for a first predetermined period; and a device for thereupon generating a flow control signal for a second predetermined period following extinction of the DC output signal to enable use of the system to control flushing of urinals or commodes. A third circuit is responsive to the DC output signal provide a flow control signal during the existence of said DC output signal, to enable the system to be used for control of shower flow and includes a device for initial adjustment of water temperature. Configuration selec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.