Air pump

Details Air pump Air pump

1982-07-21

1984-07-31

Freeh, William L.

Pumps

Expansible chamber type

Moving cylinder

417550, 417566, 417DIG1, 222401, F04B 1902, F04B 2104

Patent

active

044627670

ABSTRACT:
An air pump comprising a piston located inside a piston housing having a crown and an open end. The piston is provided with a pressure generating member in the form of a resilient membrane-like annular disc which is held centrally on one end of the piston, which is fitted in the piston housing with the annular disc and the piston plate pointed towards the crown of the piston housing whereby the rim of the membrane-like annular disc bears against the inner wall of the piston housing and the piston housing is guided on the piston in a manner enabling it to be moved axially.

REFERENCES:
patent: 984619 (1911-02-01), Truesdale et al.
patent: 1038636 (1912-09-01), Oxnard
patent: 1721127 (1929-07-01), Lilly
patent: 1929564 (1933-10-01), Rolph
patent: 1956724 (1934-05-01), Lueck
patent: 2069383 (1937-02-01), Nedbalek
patent: 3485180 (1969-12-01), Wickenberg et al.
patent: 3785532 (1974-01-01), Cooprider
patent: 4278114 (1981-07-01), Ruberg

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