Patent ID: 8540221

Claim:
An air spring for disposing between a first moving body and a second moving body that move relative to each other, the air spring comprising: a chamber member attached at the first moving body side; a piston member attached at the second moving body side; an outer tube member of cylindrical shape of larger diameter than that of the piston member; and a diaphragm of cylindrical shape of larger diameter than that of the piston member, inserted inside the tube of the outer tube member, connected to the chamber member and the piston member such that a chamber enclosure is configured inside and with the external periphery of the diaphragm attached to an intermediate section of an inner wall at the chamber member side of the outer tube member, wherein, a connecting intermediate section of the diaphragm on the chamber member side is connected to the chamber member, and a first end section disposed on the piston member side of the diaphragm is connected to the piston member, the first end section side of the diaphragm is folded back towards the tube inside in an inside out reversed state, a second end section side of the diaphragm extends from the connecting intermediate section and is folded back towards the tube outside in an inside out reversed state, and the second end section of the diaphragm is connected to the outer periphery of the outer tube member.