Dispensing – With discharge assistant – With biasing means for discharge assistant and/or its casing
Patent
1978-07-03
1979-10-02
Spar, Robert J.
Dispensing
With discharge assistant
With biasing means for discharge assistant and/or its casing
222385, 417545, B67D 542
Patent
active
041695461
ABSTRACT:
A pump assembly for dispensing fluent material from within a container includes a tank and a piston defining therebetween a pump chamber and movable relative to each other to pump fluid from the container into and out of the pump chamber. A poppet interposed between the tank and the piston extends at one end thereof into the inlet conduit for the pump chamber and at the opposite end into the exhaust conduit. When the tank and piston are moving relative to each other to draw fluid from the container into the pump chamber, the end of the poppet extending to within the exhaust conduit engages against a valve seat defined in the exhaust conduit to close the exhaust conduit. The other end of the poppet extending to within the inlet conduit is frictionally engaged within the inlet conduit and the drag forces thus effected upon this end of the poppet operate to enhance the sealing effect of the opposite end of the poppet to close the exhaust conduit thereby permitting fluid to be drawn into the pump chamber. The minimum cross sectional area through which fluid flows from the container into the pump chamber through the inlet conduit is determined by the dimensions of the inlet conduit and the end of the poppet extending thereinto. By maintaining, during the exhaust stroke of the piston, the minimum cross sectional area of the inlet conduit substantially less than the flow area of the exhaust conduit, fluid within the chamber will tend to follow the path of least resistance and flow out of the exhaust conduit rather than back into the container despite the fact that the inlet conduit is maintained open during this exhaust stroke and despite the fact that no valve means tending to close the inlet conduit at the beginning of the exhaust stroke are provided.
REFERENCES:
patent: 2681622 (1954-06-01), Titus
patent: 3159316 (1964-12-01), O'Donnell et al.
patent: 3362344 (1968-01-01), Duda
patent: 3391647 (1968-07-01), Corsette et al.
Abrams Gilbert L.
Yuhas Edward R.
Silverberg Fred A.
Spar Robert J.
Vertico Industries Inc.
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