Hand-operated pump changeable from dual action to single action

Details Hand-operated pump changeable from dual action to single action Hand-operated pump changeable from dual action to single action

1987-04-03

1989-06-27

Croyle, Carlton R.

Pumps

Changeable by assembly or disassembly

417314, 417526, F04B 2104, F04B 1900

Patent

active

048424897

ABSTRACT:
The invention provides a hand-operated pump for fluids in general, which comprises a body inside which a cylindrical hollow is provided, inside which a plunger is slidingly mounted, such a plunger dividing said hollow into a first variable-volume chamber and a second variable-volume chamber, said pump comprising unidirectional valve means which control the intake of fluid from the outside into said chambers, and the delivery of fluid from said chambers to the outside, said plunger being suitable to be reciprocatingly driven by means of an outer handle according to a to-stroke during which the handle is taken away from the pump's body, during said to-stroke fluid being intaken from the outside into the second chamber, and fluid being delivered from the first chamber to the outside, and according to a fro-stroke, during which the handle is approached again to the pump's body, during said to-stroke fluid being intaken from the outside into said first chamber, and fluid being delivered from the second chamber to the outside, said body being provided, in correspondence with the end of said first chamber, with a passage tightly closed in an openable way.

REFERENCES:
patent: 419197 (1890-01-01), Hill
patent: 767092 (1904-09-01), Walker et al.
patent: 1301751 (1919-04-01), Scanlan
patent: 1697734 (1929-01-01), Quandt, Jr.
patent: 1738734 (1929-12-01), Scoville
patent: 2445127 (1948-07-01), Schwenk
patent: 4508490 (1985-04-01), Ramirez et al.

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