Plug device for the penetration of a plunger rod into a cylinder of gas spring of the like

摘要

The cylinder of a gas spring has a bottom constituted by a plug designed for allowing gastight penetration of a plunger rod into the cylinder thanks to a seal having a lip surrounding this rod in sliding frictional engagement therewith. The seal is sandwiched between two annular holders respectively located on the outer side and on the inner side of the seal. The outer holder plays the part of a mechanical guide for the plunger rod whereas the inner holder plays the part of an oil retainer for lubrication of the seal lip.