Patent ID: 6913126

Claim:
An impact damper for deceleration of a vehicle upon impact on all obstacle by hydraulic damping forces and gas spring forces, comprising: an inner pipe and outer pipe telescopically displaceable one inside the other and defining an annular space therebetween having two axial ends; a base closing one end of said inner pipe; a dividing piston sealingly guided in said inner pipe, a gas space holding gas under pressure being defined by said inner pipe, said base, and said dividing piston, said inner pipe further defining a first liquid space separated from said gas space by said dividing piston; an intermediate wall fastened to said inner pipe and having a throttle opening therethrough connecting a second liquid space to said first liquid space, said intermediate wall sealing one of said axial ends of said annular space defined between said inner pipe and said outer pipe, wherein the other axial end of said annular space is sealed to the atmosphere; and a flow connection having a valve connected between said annular space and said second liquid space by said flow connection, wherein said flow connection allows a pressure equilibrium to occur between said annular space and said second liquid space by conducting a flow through said flow connection when said valve is opened.