System for automatic control of public washroom fixtures

Details System for automatic control of public washroom fixtures System for automatic control of public washroom fixtures

1992-06-09

1993-06-08

Cohan, Alan

Fluid handling

Processes

13762411, 25112904, 4623, E03C 105

Patent

active

052170357

ABSTRACT:
A washroom control system automatically controls water valves and soap valves by infrared sensing of a user's hands, testing a battery to determine whether enough energy is stored to reliably close a valve, and generating an alarm if the battery needs replacing. Initial sensing of a user's hands requires rapid nearby hand motion to avoid spurious detection, while continued user presence requires lower infrared sensor output signals. The system includes DIP switches set to control various delay times, whether valve open cycles are fixed or variable in accordance with continued user presence, whether a water valve is controlled in response to one or several infrared sensors, whether water valve operation is independent of or responsive to prior soap valve operation, and whether the water valves are for wash fountains or urinals. If a single water valve controls flow through plural wash fountain nozzles, a fixed length water flow cycle is retriggerable in response to any of a plurality of infrared sensors associated with the various nozzles or associated soap dispensers. If water valves are for urinals, valve opening is delayed by a preselected time after a user's presence is detected.

REFERENCES:
patent: 3151340 (1964-10-01), Teshima
patent: 4788998 (1988-12-01), Pepper
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patent: 4914758 (1990-04-01), Shaw
patent: 4941219 (1990-07-01), Van Marcke
patent: 5031258 (1991-07-01), Shaw
patent: 5060323 (1991-10-01), Shaw
patent: 5063622 (1991-11-01), Tsutsui
patent: 5086526 (1992-02-01), Van Marcke
patent: 5095941 (1992-03-01), Betz

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