Patent ID: 8556130

Claim:
A pump dispenser comprising: a container which is constructed and arranged to contain a fluid product to be dispensed and defining a top opening; and a pump module fitted into the top opening of the container and comprising a pump body, a pump plunger and an adaptor portion whereby the pump body is fitted into the container opening, the pump body and pump plunger defining a pump chamber between them and the pump plunger being reciprocable relative to the pump body in a pumping stroke to alter the volume of the pump chamber, the bottom of the pump module providing an inlet to the pump chamber from the container interior and comprising an inlet valve for the inlet, and said container further being adapted to reduce its internal volume for fluid product progressively as the product is dispensed, wherein the pump module includes a dividing wall defining an enclosed trap chamber, separated from the pump chamber inlet and having a restricted entrance through which any air in the container interior above the liquid product can enter the trap chamber to prevent the air from reaching the pump chamber inlet, wherein the pump module has a closed floor, a tubular inlet formation extending down relative to the closed floor from an inlet opening of said floor leading to the pump chamber, and a trap wall member beneath the closed floor, the trap wall member extending outwardly from at or adjacent the bottom of said tubular inlet formation to constitute said dividing wall.