Pump

Details Pump Pump

1971-05-28

1976-01-13

Freeh, William L.

Expansible chamber devices

With lubricating means

Portion of expansible chamber device includes solid...

92168, 417437, F01b 3110, F16j 1518

Patent

active

039317552

ABSTRACT:
A pump having a piston tip member which fits a cylinder bore sufficiently loosely that abrasive particles in fluid being pumped do not excessively wear away the cylinder walls and piston tip member, the fit being sufficiently close, however, as to provide substantial and effective pump pressure, the liquid that by-passes the tip member being retained by a sealing assembly surrounding the piston rod for assuring that substantially all of it returns to the forward side of the piston during a return stroke.
A paint spraying assembly using the pump described.

REFERENCES:
patent: 2330781 (1943-09-01), Langmyhr et al.
patent: 2630757 (1953-03-01), Cartier
patent: 2837898 (1958-06-01), Ahlstrand
patent: 2888879 (1959-06-01), Gaarder
patent: 2898867 (1959-08-01), Saalfrank
patent: 3019739 (1962-02-01), Prosser
patent: 3039834 (1962-06-01), Howe
patent: 3053596 (1962-09-01), Farmer et al.
patent: 3145629 (1964-08-01), Gattzmann
patent: 3203357 (1965-08-01), Delorme
patent: 3330217 (1967-11-01), Baur et al.
patent: 3424092 (1969-01-01), Hortuet

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