Piston for pressure dispensers of the barrier piston type

Details Piston for pressure dispensers of the barrier piston type Piston for pressure dispensers of the barrier piston type

1976-12-17

1978-08-29

Reeves, Robert B.

Dispensing

With discharge assistant

Container with follower

222389, B67D 554

Patent

active

041098331

ABSTRACT:
For pressure dispensers of the barrier piston type, the present piston includes circumferential ribs and adjacent grooves. The grooves so reduce the bending resistance of the piston wall as to hinge inward, to slope the ribs downward. When pressure is applied within the piston, this bends the rib against the interior can wall like a squeegee. As the piston rises in the can, the rib flexes to take up surface irregularities.
A plurality of these elements makes the piston wall flexible, permitting segments above and below each to deflect sideward. This flexibility to adapt to the cross-section of somewhat out-of-round cans adds reliability to the barrier piston pack system.

REFERENCES:
patent: 3273762 (1966-09-01), O'Neill
patent: 3381863 (1968-05-01), Towns
patent: 4023717 (1977-05-01), Schultz

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