Bowed piston for a pressure operated container

Details Bowed piston for a pressure operated container Bowed piston for a pressure operated container

1994-02-15

1995-05-30

Kashnikow, Andres

Dispensing

With discharge assistant

Container with follower

222 1, 222386, 2224021, B67D 542

Patent

active

054194660

ABSTRACT:
A bowed piston for a pressure operated container has a cylindrical sidewall including an outwardly projecting bowed portion which forms an arch engagable with a sidewall of the container. The bowed arch provides a flexible sealing surface against the sidewall which allows the piston to adapt to out-of-round, out-of-tolerance or dented containers without increasing surface friction and thus prevents the piston from binding within the container. The bowed portion flattens along a part of its length to adapt to these imperfections. Additionally, the bow allows the piston to tilt somewhat within the container without binding and maintains a very thin product film for lubrication as the piston moves upwardly in the container. Consequently, the inventive piston enhances successful utilization of such containers with various products, including those of low viscosity by minimizing binding and/or propellant blow-by in use.

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