Dispensing – With discharge assistant – Container with follower
Patent
1986-08-08
1988-01-26
Bartuska, F. J.
Dispensing
With discharge assistant
Container with follower
277 34, 384 42, B67D 542
Patent
active
047212357
ABSTRACT:
An elongate tank for transport or for storage in bulk of semisolid and fluid materials, such as grease and oil. This tank has an outlet for the material contained therein at one end thereof, and is of generally cylindric interal cross section. It has a generally cylindric piston sized to slide therein, which is adapted to be moved in a direction toward the outlet, thereby forcing the material in the tank through the outlet. An elastic annular seal is carried in a circumferential channel around the piston adjacent one end of the piston. The seal is hollow and expandable and has a pressurizing device for varying the pressure within the seal between atmospheric pressure and a pressure higher than atmospheric wherein the seal expands and presses against the internal surface of the tank with the pressure such that when the piston slides in the tank the seal is maintained in sliding engagement with the internal surface thereby to wipe the material therefrom and to seal the piston relative to the tank. The piston is held against canting in the tank by a plurality of pads fastened to the piston and extending radially outwardly therefrom beyond the periphery of the piston for engagement with the internal surface of the tank. The pads are of low friction material to permit the piston to slide freely in the tank, and they are spaced axially of the piston from the seal a distance sufficient to prevent canting of the piston.
REFERENCES:
patent: 1892519 (1932-12-01), Schottgen
patent: 2559564 (1951-07-01), Sperling
patent: 3113705 (1963-12-01), Weitzel
patent: 3203674 (1965-08-01), Watson
patent: 3321110 (1967-05-01), Price
patent: 3690742 (1972-09-01), Sang
patent: 3828988 (1974-08-01), Berry
patent: 3940152 (1976-02-01), Fournier
patent: 4632281 (1986-12-01), Wold
Bartuska F. J.
Noland Kenneth
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