Foaming liquid dispenser
View Patent ↗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 to a discharge passage of the pump where the liquid and air are mixed, generating the foam dispensed from the dispenser. The liquid dispenser is constructed with three biased closed valves that prevent leakage from a liquid container attached to the dispenser should the dispenser and container be positioned on their sides or be inverted.
1. A foaming liquid dispenser comprising:
a pump housing having a liquid pump chamber and an air pump chamber;
a liquid supply passage communicating with the liquid pump chamber;
a pump plunger mounted in the pump housing for reciprocating movement of the pump plunger relative to the pump housing, the pump plunger having an internal discharge passage extending through the pump plunger;
a liquid pump piston and an air pump piston on the pump 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 air pump chamber;
a first biased closed valve between the liquid supply passage and the liquid pump chamber, the first biased closed valve controlling a flow of liquid from the liquid supply passage to the liquid pump chamber and preventing a reverse flow of liquid; and,
a second biased closed valve between the liquid pump chamber and the internal discharge passage, the second biased closed valve controlling a flow of liquid from the liquid pump chamber to the internal discharge passage and preventing a reverse flow of liquid.
2. The dispenser of claim 1 , further comprising:
a third biased closed valve between the air pump chamber and the internal discharge passage, the third biased closed valve controlling a flow of air from the air pump chamber to the internal discharge passage and preventing a reverse flow of air.
3. The dispenser of claim 2 , further comprising:
one of the first, second and third biased closed valves being a flexible disk valve.
4. The dispenser of claim 2 , further comprising:
one of the first, second and third biased closed valves being a flexible tube valve.
5. The dispenser of claim 2 , further comprising:
one of the first, second and third biased closed valves being a plug with a flexible biasing spring.
6. The dispenser of claim 2 , further comprising:
the second and third biased closed valves being positioned in the internal discharge passage.
7. The dispenser of claim 2 , further comprising:
the first, second and third biased closed valves being coaxially aligned.
8. The dispenser of claim 2 , further comprising:
the liquid pump chamber and the air pump chamber having a common axis and the first, second and third biased closed valves being positioned along the axis of the liquid pump chamber and the air pump chamber.
9. The dispenser of claim 2 , further comprising:
the first, second and third biased closed valves including a disk valve, a plug and spring valve, and a tube valve.
10. A foaming liquid dispenser comprising:
a pump housing having a liquid pump chamber and an air pump chamber;
a liquid supply passage communicating with the liquid pump chamber;
a pump plunger mounted in the pump housing for reciprocating movement of the pump plunger relative to the pump housing, the pump plunger having an internal discharge passage extending through the pump plunger;
a liquid pump piston and an air pump piston on the pump 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 air pump chamber;
a first biased closed valve between the liquid supply passage and the liquid pump chamber, the first biased closed valve controlling a flow of liquid from the liquid supply passage to the liquid pump chamber and preventing a reverse flow of liquid;
a second biased closed valve between the liquid pump chamber and the internal discharge passage, the second biased closed valve controlling a flow of liquid from the liquid pump chamber to the internal discharge passage and preventing a reverse flow of liquid;
a third biased closed valve between the air pump chamber and the internal discharge passage, the third biased closed valve controlling a flow of air from the air pump chamber to the internal discharge passage and preventing a reverse flow of air; and,
the second and third biased dosed valves being connected together as one piece.
11. A foaming liquid dispenser comprising:
a pump housing having a liquid pump chamber and an air pump chamber;
a liquid supply passage communicating with the liquid pump chamber;
a pump plunger mounted in the pump housing for reciprocating movement of the pump plunger relative to the pump housing, the pump plunger having an internal discharge passage extending through the pump plunger;
a liquid pump piston and an air pump piston on the pump 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 air pump chamber;
a first biased closed valve between the liquid supply passage and the liquid pump chamber, the first biased closed valve controlling a flow of liquid from the liquid supply passage to the liquid pump chamber and preventing a reverse flow of liquid;
a second biased closed valve between the liquid pump chamber and the internal discharge passage, the second biased closed valve controlling a flow of liquid from the liquid pump chamber to the internal discharge passage and preventing a reverse flow of liquid;
a third biased closed valve between the air pump chamber and the internal discharge passage, the third biased closed valve controlling a flow of air from the air pump chamber to the internal discharge passage and preventing a reverse flow of air;
the second and third biased closed valves being positioned in the internal discharge passage; and,
the second and third biased closed valves being connected to opposite ends of a stem positioned in the internal discharge passage.
12. A foaming liquid dispenser comprising:
a pump housing having a liquid pump chamber and an air pump chamber;
a liquid supply passage communicating with the liquid pump chamber;
a pump plunger mounted in the pump housing for reciprocating movement of the pump plunger relative to the pump housing, the pump plunger having an internal discharge passage extending through the pump plunger;
a liquid pump piston and an air pump piston on the pump 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;
a first valve between the liquid supply passage and the liquid pump chamber, the first valve controlling a flow of liquid from the liquid supply passage to the liquid pump chamber and preventing a reverse flow;
a second valve between the liquid pump chamber and the internal discharge passage, the second valve controlling a flow of liquid from the liquid pump chamber to the internal discharge passage and preventing a reverse flow;
a third valve between the air pump chamber and the internal discharge passage, the third valve controlling a flow of air from the air pump chamber to the internal discharge passage and preventing a reverse flow; and,
at least two of the first, second and third valves being one piece.
13. The dispenser of claim 12 , further comprising:
the second and third valves being one piece.
14. The dispenser of claim 13 , further comprising:
a stem having a length with opposite ends with one end of the stem being connected to the second valve and an opposite end of the stem being connected to the third valve.
15. The dispenser of claim 14 , further compromising:
the stem being position in the internal discharge passage.
16. The dispenser of claim 13 , further comprising:
a resilient spring connecting the second and third valves.
17. The dispenser of claim 12 , further comprising:
the first, second and third valves being coaxially aligned.
18. The dispenser of claim 12 , further comprising:
the liquid pump chamber and the air pump chamber having a common axis and the first, second and third valves being positioned along the axis of the liquid pump chamber and air pump chamber.
19. The dispenser of claim 12 , further comprising:
the second and third valves each being a biased closed valve.
20. The dispenser of claim 19 , further comprising:
one of the second and third valves being a flexible tube valve.