Patent ID: 8784080

Claim:
A diaphragm pump for a seat adjusting device, configured to supply a fluid, in particular a gas, and comprising: a diaphragm and a valve member defining a pump chamber therebetween, said valve member having an inlet valve in fluid communication with said pump chamber and configured to supply fluid to said pump chamber, and an outlet valve in fluid communication with said pump chamber and configured to discharge fluid from said pump chamber; a pressure chamber in fluid communication with said outlet valve and configured to receive said fluid discharged from said pump chamber, wherein said diaphragm comprises a valve membrane of a pressure relief valve, said valve membrane being integrally formed with said diaphragm, said valve membrane being moveable in operation between a first configuration in which the valve membrane closes a pressure relief channel and a second configuration in which said valve membrane opens said pressure relief channel to allow fluid to be discharged from said pressure chamber; a bias member for biasing said valve membrane into said first configuration; and a diaphragm carrier supporting the diaphragm, the diaphragm carrier having a seat in which the bias member is received.