Pull actuated foam pump

1. A foam dispenser comprising:

a dispenser housing;

an actuator secured to the dispenser housing;

the actuator configured to releasably mate with a liquid pump of a refill unit, wherein the liquid pump is mated to a container that is provided as a single unit that is filled with a foamable liquid;

an air pump;

the actuator movable from a first position to a second position;

the second position being further away from the refill unit than the first position;

movement of the actuator from the first position to the second position causes a piston in the liquid pump to move downward away from the liquid inlet to pump foamable liquid out of the liquid pump, causes pressurized air from the air pump to mix with foamable liquid from the refill unit and causes the dispenser to dispense foam when a refill unit is installed in the foam dispenser.

2. The foam dispenser of claim 1 wherein the air pump is secured to the housing;

the air pump having an air passage configured to be in fluid communication with the refill unit and wherein the air passage is not open to the atmosphere when the refill unit is installed in the foam dispenser, and wherein the air pump remains with the foam dispenser when the refill unit is removed from the foam dispenser.

3. The foam dispenser of claim 2 wherein the air pump comprises a piston and an annular piston housing and the piston housing is mounted to the dispenser housing and the piston moves relative to the annular piston housing.

4. The foam dispenser of claim 2 wherein the air pump comprises a piston and a piston housing.

5. The foam dispenser of claim 2 wherein the air pump is annular and when the refill unit is installed in the foam dispenser the air pump and the liquid pump of the refill unit are coaxial.

6. The foam dispenser of claim 2 wherein the actuator is located above the air pump.

7. The foam dispenser of claim 2 further comprising a biasing member that biases the actuator upward toward the first position.

8. A foam dispenser comprising:

a dispenser housing;

a refill unit having a container and a liquid pump located below the container;

an air pump secured to the housing, wherein the air pump is in fluid communication with an outlet of the liquid pump when the refill unit containing foamable liquid is installed in the foam dispenser and the air pump remains with the foam dispenser when the refill unit is removed from the foam dispenser;

an actuator secured to the dispenser housing;

the actuator configured to releasably mate with a pump of the refill unit when the refill unit is installed in the foam dispenser;

the actuator movable along a vertical axis from a upper position to a lower position;

movement of the actuator from the upper position to the lower position moves an air piston and a liquid piston of the pump from an upper position to a lower piston and causes pressurized air to travel from the air pump to the outlet of the liquid pump and the pressurized air mixes with liquid to form a foam and the actuator causes the foam dispenser to dispense foam when the refill unit is installed into the foam dispenser.

9. The foam dispenser of claim 8 wherein the actuator is located above the top of the air pump.

10. The foam dispenser of claim 8 wherein the air pump comprises a piston pump.

11. The foam dispenser of claim 10 wherein the air pump is annular and configured to receive at least a portion of the liquid pump, which fits at least partially within the air pump when the refill unit is installed in the foam dispenser.

12. The foam dispenser of claim 10 wherein the dispenser comprises a base located at the bottom of the dispenser and the air pump is secured to the base of the dispenser housing.

13. The foam dispenser of claim 10 wherein the base of the dispenser housing includes an opening for dispensing foam and wherein the air pump at least partially encloses the opening.

14. The foam dispenser of claim 10 wherein movement of the actuator to the lower position compresses the air pump.

15. A foam dispenser comprising:

a housing and a refill unit having a container and a liquid pump connected together as a single unit, wherein the outlet of the liquid pump is lower than the inlet of the liquid pump;

the housing having a back and a base wherein the housing is configured to receive the refill unit full of a foamable liquid is removable from the housing;

an actuator configured to releasable mate with the refill unit when the refill unit is installed in the housing;

an air pump secured to the base of the housing;

the actuator moving along a vertical axis having an upper position and a lower position, wherein movement of the actuator from the upper position to the lower position compresses the air pump to force pressurized air to an outlet of the liquid pump and pulls the liquid piston downward and away from the liquid inlet to cause the liquid pump to pump liquid which mixes the pressurized air to form a foam that is dispensed from the foam dispenser.

16. The foam dispenser of claim 15 wherein the base of the dispenser housing includes an opening for dispensing foam and wherein the air pump at least partially encloses the opening.

17. The foam dispenser of claim 15 wherein the air pump is annular and configured to receive at least a portion of the liquid pump which fits at least partially within the air pump when the refill unit is installed in the foam dispenser.

18. The foam dispenser of claim 15 wherein the air pump is annular and when the refill unit is installed in the foam dispenser the air pump and the liquid pump of the refill unit are coaxial.

19. The foam dispenser of claim 15 wherein the actuator is located above the air pump.