Pump Maintaining Container Internal Pressure

摘要

A piston pump for dispensing fluid from a closed container in which during the cycle of operation to dispense fluid, atmospheric air is discharged into the reservoir towards reducing a vacuum that might otherwise be created within the container.

主权项

1. A dispenser for dispensing fluid from a container comprising:
a container having a container outlet opening, the container closed other than the container outlet opening, a fluid in the container, a pump mechanism including a fluid pump and a replenishing air pump, the fluid pump in communication with fluid in the container through the container outlet opening, the fluid pump receiving the fluid from the container and discharging the fluid from the container out a discharge outlet, the fluid pump comprising a piston pump with a fluid piston and a fluid chamber casing forming a fluid chamber within which the fluid piston is reciprocally slidable relative the fluid chamber casing along a fluid axis in a cycle of operation to draw the fluid from the container and discharge the fluid out the discharge outlet, the fluid pump in communication with fluid in the container through the container outlet opening, the fluid pump receiving the fluid from the container and discharging the fluid from the container out the discharge outlet, the replenishing air pump comprising a piston pump with a replenishing air piston and a replenishing air chamber casing forming a replenishing air chamber within which the replenishing air piston is reciprocally slidable along a replenishing air axis in the cycle of operation to draw air from the atmosphere and discharge the air into the container via the outlet opening, the fluid axis and the replenishing air axis are parallel, the replenishing air piston is fixed to the fluid piston for movement in unison together, the replenishing air chamber casing is fixed to the fluid chamber casing for movement in unison together.