Trigger sprayer having central vent cylinder

Details Trigger sprayer having central vent cylinder Trigger sprayer having central vent cylinder

1996-10-07

1998-02-10

Shaver, Kevin P.

Dispensing

With discharge assistant

With material supply container and discharge assistant with...

B67D 542

Patent

active

057159742

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

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patent: 5636768 (1997-06-01), Yamada

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