B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 47/34 (2006.01) A47K 5/12 (2006.01) F04B 9/14 (2006.01)
Patent
CA 2727873
The disclosure relates to pump dispensers, especially of the airless type in which the container interior reduces its volume progressively as product is dispensed to avoid air contact with the product, e.g. a medicine for oral dosing. One aim is to prevent any air in the container space above the product from reaching the pump inlet, and thereby possibly reducing a dispensed dose without the user being aware. To trap any such air and keep it away from the inlet throughout use of the dispenser, an air trap member (5) having a downwardly-convex dish form is provided below the floor of the dispenser module around the inlet, to guide any such air away from the inlet and to the periphery. At the periphery a steeply-sloping peripheral portion forms a retaining lip (53), which may make flexible wiping contact with the container wall interior, allowing air past on assembly of the dispenser. A central tubular formation (52) of the trap member (5) separates the trapped air from the inlet, and can be used to plug the trap member into the inlet. A sliding follower piston (15) may have an upward central boss (152) shaped to fit into the tubular formation (52) of the trap member (5) to maximise expulsion of product.
Law Brian Robert
Pritchett David John
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Rieke Corporation
LandOfFree
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