Dispensing – With discharge assistant – Insertable cartridge or removable container
Patent
1988-02-12
1989-05-30
Huppert, Michael S.
Dispensing
With discharge assistant
Insertable cartridge or removable container
222389, B65D 8854
Patent
active
048342688
ABSTRACT:
In dispensing cartridges with a plunger-actuated delivery piston, the afterflow of cartridge content through the outlet, which typically occurs after each advance step of the delivery piston, is prevented. This usually occurs in double cartridges for two-component substances, in which a connected flow mixer causes high outflow resistance and correspondingly high pressure inside the cartridge during dispensing; concomitant "breathing" of the thin-walled cartridge cylinder is recognized as the primary cause of uncontrolled afterflow. The delivery piston of the invention is built with a sealing ring which is elastically deformable when acted upon by plunger force, in order to permit the delivery piston to recede in the direction opposite to the advance direction when the stress on the plunger is removed. Due to the axial volume expansion connected to it, the internal pressure can be reduced immediately after the stress is removed from the piston before the cartridge content shows afterflow through the outlet. In addition, through temporary squeezing during each advance, the sealing ring can be increasingly pressed against the cylinder wall in order to increase the sealing effect; in the unstressed resting position, pressing and hence the piston friction is far less and only the practically pressure-less cartridge content is to be sealed.
REFERENCES:
patent: 2933221 (1980-04-01), Rand et al.
patent: 3029985 (1962-04-01), Krueger et al.
patent: 3752367 (1973-08-01), Sundholm
patent: 4022355 (1977-05-01), Sabaka
patent: 4452370 (1984-06-01), Langensiepen et al.
patent: 4645098 (1987-02-01), Hoffman
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