Patent ID: 6840745
Filing Date: 2005-01-11
Classification: F04B,Y10T

Abstract:
1. A diaphragm pump comprising a two part casing formed of a front cover and a back cover, a diaphragm plate extending across the covers and being secured therebetween when the covers are fastened together, the diaphragm plate having a plurality of circular regions, the front cover having substantially axially aligned inlet and outlet ports, each respectively leading to an inlet chamber, or alternatively, to an outlet chamber, a valve housing securable inside the front cover and having defined therein an outlet dished valve seat with a correspondingly concave resilient outlet valve seated therein, the outlet dished valve seat having fluid passages therethrough, and a plurality of inlet valve seats, equal in number to the number of circular regions, each being similarly dished and having a correspondingly concave resilient valve seated therein, each inlet valve seat having fluid passages therethrough, the resilient outlet valve being in fluid communication with the outlet chamber and each said inlet valve being in fluid communication with the inlet chamber, and a wobble plate positioned in the back cover and having a central boss and a plurality of similar piston sections equal in number to the number of circular regions on the diaphragm plate, the piston sections and circular regions being correspondingly secured together, the wobble plate being subject to nutating motion to cause reciprocating action by the circular regions and provide a pumping action, the wobble plate central boss is adapted to seat and hold a bearing, the bearing having been insert molded in the boss with the boss having an inwardly-extending retaining flange which extends over the bearing and around the entire bearing.