Dispensers for fluent masses with enhanced sealing and latching

Details Dispensers for fluent masses with enhanced sealing and latching Dispensers for fluent masses with enhanced sealing and latching

1991-11-04

1992-12-15

Shaver, Kevin P.

Dispensing

Resilient wall

Fluid pressure generating pump or pulsator and/or removable...

222215, 222386, 222391, B65D 3700

Patent

active

051709139

ABSTRACT:
A container (12) includes a discharge outlet (18) and a pliant tubular wall (16) which extends longitudinally from the outlet. The wall of the container is adapted to be deformed by being squeezed for dispensing a mass (24) from the container through the outlet. A piston follower (26, 126) in the container, which is movable towards the outlet and against the mass, has seals (60, 61; 160, 162) that slide on, yet remain sealed with the wall to prevent both leakage of the mass past the seals out of the container and leakage of air past the seals into the container. Degradation in the sealing engagemenet of the seals with the container wall, when the wall is squeezed, even under excessive force, is essentially prevented by a rigid support (72), which is embodied as a ring (138) or radially and longitudinally extending webs (42) acting as struts. The rigid support ensures that the seals will not lose contact with the inner wall surface (17) of container (12). Latches (50, 150) on the follower prevent substantially all movement of the follower in a direction away from the outlet but permit movement of the follower in a direction toward the outlet. The latches are sufficiently distanced from the seals so that neither the deflectability of the latches nor the sealing of the seals is degraded.

REFERENCES:
patent: 2847009 (1958-08-01), Blease
patent: 3211347 (1965-10-01), Phillips, Jr.
patent: 3768705 (1973-10-01), Spatz
patent: 3870200 (1975-03-01), Spatz
patent: 4269330 (1981-05-01), Johnson
patent: 4308977 (1982-01-01), Sigmund et al.
patent: 4949873 (1990-08-01), Maeder

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