Foaming liquid dispenser
AssigneeContinental AFA Dispensing Company
InventorsDonald D. Foster, Philip L. Nelson
Life of this patent
Estimating the term…
Abstract
A manually operated liquid foaming dispenser is attached to the top of a container of liquid and is manually vertically reciprocated to dispense the liquid from the container as a foam. The dispenser includes a liquid pump chamber and an air pump chamber that respectively pump liquid and air under pressure to a discharge passage of the pump where the liquid and air are mixed, generating the foam dispensed from the dispenser. The air pump chamber has a tube valve controlling the discharge of air from the air pump to the discharge passage, and the air pump chamber is charged with air by opening the air pump chamber to the exterior environment of the dispenser.
Claims29
A foaming liquid dispenser comprising:
- a pump housing having a liquid pump chamber with a cylindrical interior surface and an air pump chamber with a cylindrical interior surface;
- a pump plunger in the pump housing, the plunger having an interior discharge passage extending through the plunger;
- a liquid pump piston and an air pump piston on the plunger, the liquid pump piston and the air pump piston being mounted in the respective liquid pump chamber and the air pump chamber for reciprocating movement between charge and discharge positions of the liquid pump piston and the air pump piston in the respective liquid pump chamber and the air pump chamber, where in the charge positions the liquid pump piston and air pump piston each engage with the respective liquid pump chamber interior surface and air pump chamber interior surface and in the discharge positions the liquid pump piston engages with the liquid pump chamber interior surface and the air pump piston at least partially disengages from the air pump chamber interior surface.
A foaming liquid dispenser comprising:
- a pump housing having a liquid pump chamber with a cylindrical interior surface and an air pump chamber with a cylindrical interior surface, the air pump chamber interior surface having a first section with a first interior diameter dimension and a second section with a second interior diameter dimension, the first interior diameter dimension being larger than the second interior diameter dimension;
- a pump plunger in the pump housing, the plunger having an interior discharge passage extending through the plunger;
- a liquid pump piston and an air pump piston on the plunger, the liquid pump piston and the air pump piston being mounted in the respective liquid pump chamber and air pump chamber for reciprocating movement between charge and discharge positions of the liquid pump piston and air pump piston in the respective liquid pump chamber and air pump chamber, and the air pump piston having a cylindrical exterior surface with an exterior diameter dimension that is larger than the interior diameter dimension of the second section of the air pump chamber interior surface and is smaller than the interior diameter dimension of the first section of the air pump chamber interior surface.
A foaming liquid dispenser comprising:
- a pump housing having a liquid pump chamber and an air pump chamber;
- a pump plunger in the pump housing, the plunger having an interior discharge passage extending through the plunger;
- a liquid pump piston and an air pump piston on the plunger, the liquid pump piston and the air pump piston being mounted in the respective liquid pump chamber and air pump chamber for reciprocating movement between charge and discharge positions of the liquid pump piston and the air pump piston in the respective liquid pump chamber and air pump chamber;
- and,
- an air pump stopper on the plunger that engages with and seals the air pump chamber when the liquid pump piston and the air pump piston are moved to the discharge positions.
A foaming liquid dispenser comprising:
- a pump housing having a liquid pump chamber and an air pump chamber;
- a pump plunger in the pump housing, the plunger having an interior discharge passage extending through the plunger;
- a liquid pump piston and an air pump piston on the plunger, the liquid pump piston and the air pump piston being mounted in the respective liquid pump chamber and air pump chamber for reciprocating movement between charge and discharge positions of the liquid pump piston and the air pump piston in the respective liquid pump chamber and air pump chamber;
- valve opening extending through the plunger between the air pump chamber and the discharge passage;
- and,
- a valve element overlying the valve opening.
Dependencies are inferred from the claim text.