Piston-cylinder unit of a safety arrangement for protecting pedestrians

摘要

In the cylinder(1) of the piston and cylinder unit an elastic and compressible damping ring(10) is fitted on the piston rod(4) between the reciprocating piston(3) and cylinder cover(2). The damping ring brakes the piston rod by friction between the rod and cylinder and also buffers the impact of the piston against the cylinder cover. When the piston rod extends the damping ring is freely movable on it, and when the piston rod retracts the damping ring is fixed in relation to it by a retaining device on the piston.