Contents-conserving plunger for cartridge

Details Contents-conserving plunger for cartridge Contents-conserving plunger for cartridge

1975-12-11

1977-06-21

Knowles, Allen N.

Dispensing

With discharge assistant

Container with follower

B67D 542

Patent

active

040306437

ABSTRACT:
A cartridge plunger has a flexible forward wall with a forwardly extending central projection shaped to fit part way into the nozzle. The flexible forward wall is moved to a rearward position when the plunger engages the contents of the cartridge as it is inserted in the rear end of the cartridge. Although the forward-extending projection displaces some of the contents, the volume made available around the projection from the forward wall being in the rearward position is greater than the volume displaced by the projection. This allows a slight increase in the total volume of contents loadable into the cartridge, and when the plunger is forced against the front of the cartridge, the contents are not only forced out of the cartridge itself, but also from a portion of the nozzle occupied by the forward projection of the plunger. This dispenses the slightly larger volume of cartridge contents more completely for fully delivering a standard volume of contents without change in standardized size and shape of the cartridge.

REFERENCES:
patent: 2920797 (1960-01-01), Sherbondy
patent: 3066836 (1962-12-01), Trumbull
patent: 3250443 (1966-05-01), Abbott, Jr.
patent: 3315847 (1967-04-01), Trumbull

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