Dispensing – Automatic control – Motor control
Patent
1997-02-11
1998-11-03
Bomberg, Kenneth
Dispensing
Automatic control
Motor control
222109, 222642, G01F 1100
Patent
active
058296360
ABSTRACT:
A soap dispenser includes a soap supply, a motor driven pump connected by tubing to the soap supply and a soap output device connected by tubing to the motor driven pump. The electric drive circuit for operating the pump motor includes a sensor for detecting a user's hands positioned to receive soap from the output device. There is a forward motor control circuit connected to the sensor and to the pump motor and responsive to a start signal from the sensor to drive the pump motor in a forward direction to supply soap to the output device. There is a volume adjust circuit connected to the forward motor control circuit and to the sensor to provide a stop signal to the forward motor control circuit a predetermined time period after receipt of a start signal from the sensor. There is a reverse motor control circuit connected to the pump motor and to the volume adjust circuit and responsive to a stop signal from the volume adjust circuit to drive the pump motor in a reverse direction to reverse the flow of soap to the output device.
REFERENCES:
patent: 4722372 (1988-02-01), Hoffman et al.
patent: 4989755 (1991-02-01), Shiau
patent: 5235214 (1993-08-01), Voung et al.
patent: 5255822 (1993-10-01), Mease et al.
patent: 5299713 (1994-04-01), Saitoh
patent: 5305915 (1994-04-01), Kamysz et al.
patent: 5492247 (1996-02-01), Shu et al.
Aparicio Jesse L.
Vuong Nhon T.
Bomberg Kenneth
Sloan Valve Company
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