Patent ID: 7373872

Claim:
Diaphragm pump ( 1 ) comprising an annular working chamber ( 6 ) and an annular diaphragm ( 3 ), which is fixed on an outer peripheral region ( 12 ) and on inner edge region ( 13 ) thereof, wherein inner and outer diaphragm fixing points are stationary relative to one another and a drive element ( 8 ) connected to a pump drive for deflecting the annular diaphragm ( 3 ) contacts the annular diaphragm between the outer and inner fixing points, the drive element ( 8 ) facing the diaphragm comprises a sleeve or ring shape with a diameter corresponding approximately to the annular working chamber ( 6 ) and with one annular end thereof perpendicular to a plane of and contacting a side of the annular diaphragm ( 3 ) facing the pump drive for deflection and for transmission of a back-and-forth movement to the annular diaphragm ( 3 ), wherein the drive element ( 8 ) is fixed only on one side of the annular diaphragm ( 3 ) that faces away from the working chamber ( 6 ).