B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
B05B 11/00 (2006.01) A47K 5/12 (2006.01) F04B 9/14 (2006.01) F04B 53/14 (2006.01)
Patent
CA 2521026
A disposable plastic pump (10) for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body (12) having an open outer end and an inner end in fluid communication with a liquid reservoir (26), and a piston (16) formed to slidably fit into the chamber (12). The chamber (12) forms two axially adjacent coaxial chambers, an inner chamber (204) of a larger diameter and an outer chamber (202) of a smaller diameter. The piston (16) comprises a stem (46) on which is located two spaced flexing discs (216, 48) each sized to fit in and serving as a one-way valve In the inner chamber (204) and outer chamber (202), respectively, permitting fluids to flow outwardly past each flexing disc (216, 48). A sealing disc (50) is located on the stem (46) outwardly of the outermost flexing disc (48). A passageway (52) is provided from an inlet (53) on the piston (16) between the outermost flexing disc (48) and the sealing disc (50) through which the dispensed liquid flows.
Ophardt Heiner
Riches Mckenzie & Herbert Llp
LandOfFree
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