Pumps – With signal – indicator – or inspection means
Patent
1981-11-02
1983-12-27
Freeh, William L.
Pumps
With signal, indicator, or inspection means
417440, 417441, F04B 2100, F04B 3900
Patent
active
044228317
ABSTRACT:
A piston type fluid pump which can maintain its prime even though the source of fluid from which the pump draws its supply becomes empty. The pump is capable of pumping its discharge into a pressure vessel as well as to the atmosphere if desired. The pump assembly includes a discharge chamber that receives discharged fluid from the pump and for ultimate delivery to the outflow of the pump assembly. The discharge chamber is of a volumetric size at least equal to or greater than the volume of the effective pumping chamber of the piston so that any air that enters the pumping chamber from the supply or inlet side of the pump remains at the top of the pumping chamber and is discharged into the discharge chamber and the pumping chamber remains full of fluid and consequently primed. The pump assembly is arranged so that the discharge chamber is located above the pumping chamber whereby fluid from the discharge chamber can flow back into the pumping chamber thereby filling the latter with fluid and maintaining it free of air.
REFERENCES:
patent: 1343574 (1920-06-01), Miller
patent: 1695318 (1928-12-01), Buvinger et al.
patent: 1900228 (1933-03-01), Dean
patent: 2808786 (1957-10-01), Johnston
patent: 2847149 (1958-08-01), Ainsworth
patent: 2973779 (1961-03-01), Kennedy
patent: 2978149 (1961-04-01), Roson
patent: 3610784 (1971-10-01), Rundol
patent: 3612722 (1971-10-01), Neward
Bender Machine Works, Inc.
Freeh William L.
Nilles James E.
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