Dispensing – With discharge assistant – Container with follower
Patent
1994-08-09
1995-08-15
Shaver, Kevin P.
Dispensing
With discharge assistant
Container with follower
222386, B67D 554
Patent
active
054411815
ABSTRACT:
A piston with a flexible sealing wipe which comprises an outer annular ring which extends from a lower portion of the piston. The outer ring has an annular projecting tip which engages the sidewall of the container during upward movement of the piston within the container. The annular ring has a thickness less than the thickness of the piston sidewall to increase the flexibility of the wipe, and it is disposed adjacent to an inner annular ring and spaced therefrom by a gap. When inserted into a can, the projecting lip is displaced inwardly into the gap, with the reduced thickness of the wall assuring that the amount of resistance to piston travel is minimized. In addition, the piston provides a substantially liquid tight interference fit with the can to prevent interaction between the contents of the upper portion of the container with those in the lower portion of the container.
REFERENCES:
patent: 2992052 (1961-07-01), De John
patent: 3099370 (1963-07-01), Hein
patent: 3319841 (1967-05-01), Berg
patent: 3381863 (1968-05-01), Towns
patent: 3901416 (1975-08-01), Schultz
patent: 4106674 (1978-08-01), Schultz
patent: 4109833 (1978-08-01), Gross
patent: 4134523 (1979-01-01), Hansen et al.
patent: 4703875 (1987-11-01), Malek
patent: 4913323 (1990-04-01), Scheindel
patent: 5127556 (1992-07-01), Sporri
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