TRIGGER SPRAYER HAVING CENTRAL VENT CYLINDER

摘要

A liquid dispenser (20) comprising a dispenser body (22) having a pump mechanism (50) defining a variable volume fluid receiving cavity (116). A cylindric formation (130), smaller than the fluid receiving cavity (116), is within the cavity (116) and a vent passageway (134) is in fluid communication with the cylindric formation (130). A plunger (132) is reciprocally moveable within the cylindric formation (130) and is configured for moving with the pump mechanism (50) as the pump mechanism (50) is moved between extended and contracted positions. The plunger (132) and cylindric formation (130) are configured such that the vent passageway (134) is in fluid communication with the fluid receiving cavity (116) of the pump mechanism (50) when the pump mechanism (50) is in its contracted position and is configured to block fluid communication between the vent passageway (134) and the fluid receiving cavity (116) when the pump mechanism (50) is in its extended position.