Liquid dispenser

Details Liquid dispenser Liquid dispenser

1989-01-17

1990-07-03

Skaggs, H. Grant

Dispensing

Automatic control

222 63, 222639, 222333, 222566, 250221, 417417, B67D 500

Patent

active

049383841

ABSTRACT:
An electrically operable liquid soap dispenser responsive to the presence of a user dispenses a measured amount of soap on demand. It has a spout with a fluid conduit therein connecting a soap reservoir and a nozzle. A pump draws soap from the reservoir during a stroke of its plunger and depending on the embodiment, ejects a measured amount of soap during a subsequent plunger downstroke or upstroke. At least one check valve regulates the flow of soap from the reservoir to an orifice at the nozzle. The soap path from the reservoir to the nozzle is kept full of soap so that a single cycle of the pump is sufficient to eject the desired amount of soap. The orifice is sized and shaped so as to prevent dripping while maintaining soap at the nozzle ready to be ejected. A light beam emitter and detector control operation of the pump.

REFERENCES:
patent: 2446109 (1948-07-01), Scarry
patent: 3327901 (1967-06-01), Yerkovich
patent: 3419188 (1968-12-01), Matchett
patent: 3480787 (1969-11-01), Johansen
patent: 4306843 (1981-12-01), Arai
patent: 4518105 (1985-05-01), Kuchens et al.
patent: 4722372 (1988-02-01), Hoffman et al.
patent: 4767922 (1988-08-01), Stauffer

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