Automatic dispensing apparatus having low power consumption

Details Automatic dispensing apparatus having low power consumption Automatic dispensing apparatus having low power consumption

1988-08-26

1990-05-01

Skaggs, H. Grant

Dispensing

Including timer

For timing dispensing period

222214, 141360, 13762411, B67D 508

Patent

active

049211501

ABSTRACT:
An apparatus for automatically dispensing flowable material from a disposable container includes a novel electronic control circuit for providing improved and more efficient operation over prior art devices. The electronic control circuit includes a photoelectric emitter, and a phototransistor detector adapted to receive energy reflected from a target such as a user's hands. The control circuit includes a first timing circuit for periodically activating the detector for a predetermined first time period equal to approximately one percent (1%) of the period between operating cycles of the detector. The control circuit also includes a second timing circuit, triggered by the first timing circuit, for activating the emitter during a latter portion of the first time period during which the detector is activated to thereby enable the detector to stabilize after power up. The emitter generates a high energy pulse having a predetermined duty cycle preferably at least one order of magnitude less than the duty cycle of the detector. The electronic control circuit further includes a detector circuit, responsive to sensing of electromagnetic radiation reflected from the target to generate an actuation signal. The detector circuit is designed to be sensitive only to a short duration pulse signal which would be reflected if the user's hands are properly positioned to activate the dispenser. The control circuit also includes a third timing circuit responsive to the actuation signal for activating a pump. This operation actuates the release of a predetermined amount of material from the disposable container.

REFERENCES:
patent: 3273752 (1966-09-01), Horeczky
patent: 3327901 (1967-06-01), Yerkovich
patent: 3384080 (1968-05-01), Muller
patent: 3531021 (1970-09-01), Bassett
patent: 4135647 (1979-01-01), Mascia et al.
patent: 4414982 (1983-11-01), Durkan

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