Patent ID: 8454331

Claim:
A pump assembly comprising: an upper plate and a lower plate; at least one chamber having a lower valve and an upper valve; a piston positioned within said at least one chamber; a drive shaft actuating said upper plate and said lower plate side-to-side alternately opening and closing said lower valve and said upper valve of said at least one chamber and further actuating said piston positioned within said at least one chamber alternately increasing an area of said at least one chamber when receiving fluid through said lower valve and decreasing said area of said at least one chamber when pushing said fluid through said upper valve; and an upper eccentric cam connected to said upper plate and a lower eccentric cam connected to said lower plate, said upper eccentric cam and said lower eccentric cam rotated by said drive shaft to actuate said upper plate and said lower plate; a secondary cam connected to said drive shaft for actuating said piston, wherein said secondary cam comprises an upper secondary cam and a lower secondary cam both rotated by said drive shaft to actuate said piston.