Patent ID: 7270318

Claim:
An energy-accumulating piston-cylinder device comprising: a pistons, displaceable in a cylinder under the effect of pressure, a fluid-filled chamber, defined between the piston and the cyinder, a duct passing axially through the piston, providing a connection between the fluid-filled chamber and an open surrounding environment outside of the piston-cylinder device, a sealing part to prevent communication through the duct between the fluid- filled chamber and the open surrounding environment, and a pin element for interaction with the sealing part, wherein the sealing part and duct from a safety valve, which is arranged to relieve the pressure in the fluid-filled chamber when the piston, under the effect of pressure in excess of a predetermined valve, is inserted to a predetermined position in the cylinder, and wherein the pin element is arranged to act upon the sealing part when the piston is inserted to the predetermined position, to establish a discharge route via the duct between the chamber and the open surrounding environment.