Hydraulic/pneumatic pump

Details Hydraulic/pneumatic pump Hydraulic/pneumatic pump

1991-09-20

1993-02-23

Bertsch, Richard A.

Pumps

Diverse pumps

417201, 417204, F04B 2308, F04B 2314, F04B 3310

Patent

active

051885166

ABSTRACT:
A hydraulic/pneumatic pump for an aquarium includes a motor having an upper output shaft enclosed by an upper casing and a lower output shaft enclosed by a lower casing, a hydraulic pump assembly driven by the lower output shaft, and a pneumatic pump assembly driven by the upper output shaft. The hydraulic pump assembly pumps water from the aquarium to be filtered via an inlet pipe thereof and outputs water to a filter unit via an outlet pipe thereof. The pneumatic pump assembly includes a ring mounted on the upper output shaft, an impinging member securely mounted on an upper surface of the ring, an actuating pin, a return spring, an air bag, a lower chamber, an upper chamber, and a variable chamber defined by the air bag. Air is sucked into the variable chamber via an inlet opening in the body and the lower chamber when the impinging member disengages with the actuating pin to release the air bag by the return spring. The intake air in the variable chamber is exhausted via the upper chamber and an outlet opening when the air bag is compressed upon impingement of the impinging member on the actuating pin.

REFERENCES:
patent: 2009921 (1935-07-01), Hayakawa
patent: 2542896 (1951-02-01), Brady
patent: 3744635 (1973-07-01), Horvath
patent: 4990066 (1991-02-01), Kern

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