Patent ID: 7416064
Filing Date: 2008-08-26
Classification: F16F

Abstract:
1. A boot in a hydraulic, hydropneumatic or pneumatic piston-cylinder unit including a cylinder and a piston rod having an end projecting out of the cylinder, said boot covering the portion of the piston rod projecting from the cylinder and being arranged between the end of the piston rod and the cylinder for protecting against at least one of dirt and damage, said boot defining an interior space that changes in volume in response to relative movement of the piston rod and the cylinder, at least one flow connection being arranged in said boot allowing air in the interior space to communicate with the atmosphere external to said boot, and said boot further including a first flange comprising a collar arranged at an end of said boot serving to cover a portion of the piston-cylinder unit and a second flange arranged on said boot an axial distance from said collar, each of said first and second flanges having a radially inner end attached to said boot and a free radially outer end, the at least one flow connection being a bore hole through said boot disposed within the axial distance between the radial inner ends of said first and second flanges, said second flange forming a first nonreturn valve with said collar such that a flow of air through the at least one flow connection in a first direction is prevented by said first nonreturn valve.