SENSING MULTI-STAGE CONTROL SYSTEM FOR HAND DRYERS
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United States of America Patent
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Issued Date -
Dec 3, 2009
app pub date -
May 29, 2008
filing date -
May 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A sensing multi-stage control system for hand dryers aims to be installed in a lavatory and energized by electric power to generate heat and airflow to dry human hands to improve shortcomings of conventional hand dryers that cannot control airflow amount and temperature level. The hand dryer according to the invention includes a heater, a fan motor and a detection unit. The detection unit has at least two sets of sensors located at an air outlet of the hand dryer and is electrically connected to a control circuit which starts, stops and controls the heater and fan motor at a desired temperature level and rotation speed to form the sensing multi-stage control system. The control circuit, incorporating with the sensors and a comparison and logic processor to process signals, can provide multi-stage control of the temperature level of the heater and rotation speed of the fan motor.
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