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US 2003/0201285 A1Published application
Liquid dispenser with screw pump
OwnerJie Zhanginventor
Life of this patent
Estimating the term…
Abstract
A liquid dispenser operates automatically when a hand is present. The dispenser has a screw mounted on a bottle cap housing that turns to pump liquid from an inverted bottle. The screw is turned by a sensor activated motor. A valve open to allow air to enter the bottle to replace the volume of soap dispensed.
Claims20
A liquid dispenser, comprising:
- a dispenser housing;
- an inverted bottle mounted on said dispenser housing and having a bottom portion and a neck with external threads;
- a cap having a hollow ring, said ring having internal threads mating with said external threads of said bottle inside said dispenser housing, said cap defining an exit port for liquid to flow from said bottle and an entrance port for air to flow through said cap to said bottle;
- a screw housing attached to said cap and defining a dispensing spout;
- and
- a screw mounted in said screw housing, said screw transporting liquid from said cap to said dispensing spout when said screw rotates.
3 more elements
A liquid dispenser, comprising:
- an inverted bottle;
- a cap;
- means for attaching said cap to said bottle;
- a pump disposed in said cap;
- and
- means for activating said pump.
3 more elements
A pump for a liquid dispenser, comprising:
- a housing having a first passageway for receiving liquid to be dispensed, a second passageway for receiving air to replace the volume of liquid dispensed, an exit port for dispensing the liquid;
- and
- a screw mounted in said housing, said screw transporting liquid from said cap to said dispensing spout when said screw rotates.
Dependencies are inferred from the claim text.