초록 ▼

A sensor activated unit, e.g., a drinking fountain or a wash basin, for preventing unwanted operation. The sensor has a power on reset circuit that makes use of a resistor capacitor network and a voltage threshold comparing device to create a time delay that will inhibit the operation of the unit fo

A sensor activated unit, e.g., a drinking fountain or a wash basin, for preventing unwanted operation. The sensor has a power on reset circuit that makes use of a resistor capacitor network and a voltage threshold comparing device to create a time delay that will inhibit the operation of the unit for a nominal predetermined time period when current is first supplied to the sensor. The sensor does not activate until a user steps up to the unit and is within a preset range or distance from the unit. Use is made of an infrared sensor for controlling the operation of the unit. Circuitry is provided to control the time of commencement of the operation of the unit, the time period duration of operation, and down time of the unit before it is readied for operation again.

대표청구항 ▼

A system for controlling the flow of water through water supply means, including: a sensor operatively associated with said water supply means to cause water to be supplied by said water supply means; a first control circuit coupled with said sensor for sensing and determining the continued external

A system for controlling the flow of water through water supply means, including: a sensor operatively associated with said water supply means to cause water to be supplied by said water supply means; a first control circuit coupled with said sensor for sensing and determining the continued external activation characteristic of the presence of a user or external activation proximate to said sensor and within the range of energization of said sensor and the absence of the characteristic of external activation or presence of a user; a second control circuit including water flow time commencement means responsive to said characteristic for determining the time of commencement of the flow of water through said water supply means in response to an external activation of said sensor after the elapse of a predetermined period of time; and a third control circuit responsive to said second control circuit including water flow shut-off means for permitting water to flow solely for a predetermined period of time after commencement of water flow by said second control circuit, said third control circuit causing the water flow to be shut off after a predetermined period of time of water flow and overriding said second control circuit to prevent said second control circuit from commencing water flow.