Syringes adapted to overcome a pressure resistance

Details Syringes adapted to overcome a pressure resistance Syringes adapted to overcome a pressure resistance

1977-04-01

1978-09-12

Reeves, Robert B.

Dispensing

With discharge assistant

Fluid pressure

222401, 734254P, 128237, B65D 8314

Patent

active

041131444

ABSTRACT:
A syringe of the slide piston pump type is adapted to overcome a pressure resistance at its outlet as may be provided, for instance, by a filter in communication with the outlet and through which the syringe is to pump a medium, particularly a liquid medium, for filtration. The syringe comprises a cylinder containing a piston, and a piston rod. The piston rod is fixed to a second piston sliding within a longitudinal bore in the first-mentioned piston. The bore and the second piston cooperate to define an air-filled pressure chamber connected to a cylinder chamber, defined by the first piston and the cylinder, by a valve. Inward movement of the piston rod produces an over-pressure (e.g. 16 atmospheres) in the pressure chamber to open the valve to apply the over-pressure to the liquid or other medium in the cylinder chamber to overcome the pressure resistance of the filter and enable the liquid to be forced through the filter. A safety pressure release is provided to prevent bursting or inadvertent release of the liquid medium.

REFERENCES:
patent: 1435034 (1922-11-01), Ullman
patent: 1623101 (1927-04-01), Fisher
patent: 1636711 (1927-07-01), Nicoll
patent: 1751128 (1930-03-01), Cocks
patent: 2049851 (1936-08-01), Madan
patent: 3635218 (1972-01-01), Ericson
patent: 3685514 (1972-08-01), Cheney

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