Patent ID: 6485270
Filing Date: 2002-11-26
Classification: F04B

Abstract:
An air pump for a fish-tank comprising;a base plate; a body comprising a frame, an inlet air chamber, an outlet air chamber divided by said frame, a first and a second inlets at said inlet air chamber, a first and a second outlets at said outlet air chamber, a slot on each of said first inlet and said first outlet, a discharge pipe, and a bottom casing comprising an air charge opening on an upper portion thereof in communication with outside, a compartmental air chamber assembly, an air charge tube extended down from said air charge opening to said compartmental air chamber assembly, a bottom end of said air charge tube urged against an inner wall of said base plate, and one or more third outlets around a periphery of said bottom end of said air charge tube; a cap clung onto said frame; a vibration mechanism secured to an outer surface of said cap, said vibration mechanism comprising a magnet at one side; a pair of check mechanisms with said body sandwiched therebetween, each of said check mechanisms clung to said corresponding slot and comprising a block member and a diaphragm for regulating air passing through said first inlet and said first outlet; a pad clung to a rear side of said body; and a rear plate clung to a rear side of said pad; wherein air is guided into said air chamber assembly prior to leaving said discharge pipe.