Dispenser for flowable materials having a piston with a flexible

Details Dispenser for flowable materials having a piston with a flexible Dispenser for flowable materials having a piston with a flexible

1991-03-11

1992-03-03

Shaver, Kevin P.

Dispensing

With discharge assistant

Container with follower

92240, 92247, 92249, 277152, 277212C, 222319, G01F 1100

Patent

active

050924966

ABSTRACT:
A dispenser for flowable materials, such as toothpaste, includes a hollow barrel in the form of a tube open at its lower end and closed at its upper end with the flowable material being inserted in the tube. A plunger which is also in the form of a hollow tube having a closed upper end, is telescopically arranged in the barrel. A seal is effected by a hinged peripheral rim on the outer surface of the piston near its upper end. The flow of the material forces the peripheral rim to pivot into sealing contact with the inner surface of the barrel.

REFERENCES:
patent: 2840426 (1958-06-01), Salansky
patent: 3176595 (1965-04-01), Schwartz
patent: 3266385 (1966-08-01), Scaramucci
patent: 3381863 (1968-05-01), Towns
patent: 4083428 (1978-04-01), Ness
patent: 4203353 (1980-05-01), Burnham et al.
patent: 4742940 (1988-05-01), Wilkinson

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