Pumps – Motor driven – Fluid motor
Patent
1979-11-23
1982-01-05
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
92 131, 92 136, F04B 3502, F15B 1524
Patent
active
043091563
ABSTRACT:
A fluid activated pump that is particularly well suited for use in analytic machines of the type that need to accurately meter quantities of sample solutions. The pump, which includes a pump piston driven by a power piston, is powered either hydraulically or pneumatically. Also included in the pump is a displacement adjustment piston, which is either hydraulically or pneumatically controlled, and which, through a suitable shaft-type linkage, can adjust the length of the power piston's stroke, and thus permit either a large or small displacement of the pump piston. The fact that the pump piston's displacement can be changed means that the pump of the present invention can more efficiently meter solutions into various desired ratios, and can reduce the chance of cross-contamination of sample solutions by dispensing a large amount of rinsing solution after dispensing a relatively small amount of sample solution.
REFERENCES:
patent: 2430597 (1947-11-01), Acton
patent: 2478790 (1949-08-01), Stephens
patent: 2538812 (1951-01-01), Umberger
patent: 3168853 (1965-02-01), Prince
patent: 3492946 (1970-02-01), Martin
patent: 3621865 (1971-11-01), Baggaley
patent: 3793925 (1974-02-01), Collin
patent: 4047850 (1977-09-01), Berthelot
Gonner Winfried
Huber Bernhard
Giarratana S. A.
Hays R. A.
Masselle F. L.
Smith Leonard E.
The Perkin-Elmer Corporation
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