Dispensing pump for syringe

Details Dispensing pump for syringe Dispensing pump for syringe

1986-08-19

1987-10-20

Rolla, Joseph J.

Dispensing

Movably mounted supply container

Moving relatively to trap, impeller or valve to cause discharge

222399, 222401, 604184, B65D 8300, A61M 518

Patent

active

047008725

ABSTRACT:
A pump for dispensing liquid via a syringe has a chamber in which a hollow cylinder is mounted. The cylinder is connected to the chamber via a first normally closed check valve. A hollow plunger reciprocates in the cylinder is connected thereto via a second normally closed check valve. A charge of liquid is placed in the hollow plunger. On the out-stroke of the piston, the liquid in the piston is sucked through the second normally closed check valve into the cylinder and on the in-stroke of the plunger the liquid is forced through the first normally closed check valve into the chamber wherein it is maintained under pressure created by the pumping action of the plunger. An outlet tube leads from the lower part of the chamber to a syringe and an normally closed pinch valve in the syringe is manually operable to permit liquid under pressure to be squirted from the syringe.

REFERENCES:
patent: 1563627 (1925-12-01), Hein
patent: 2743847 (1956-05-01), Pollak
patent: 2880939 (1959-04-01), Esmay
patent: 3191807 (1965-06-01), Rodrigues, Jr.
patent: 4036232 (1977-07-01), Genese
patent: 4175704 (1979-11-01), Cohen
patent: 4537334 (1985-08-01), Spengler et al.

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