초록 ▼

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

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.

대표청구항 ▼

Pneumatic spring apparatus having a cylinder, a trio plug device forming a closure at an end of said cylinder, and a reciprocable plunger rod slidably fitted through said plug device for operation in said cylinder, said trio plug device consisting of three elements in axial succession: a first annul

Pneumatic spring apparatus having a cylinder, a trio plug device forming a closure at an end of said cylinder, and a reciprocable plunger rod slidably fitted through said plug device for operation in said cylinder, said trio plug device consisting of three elements in axial succession: a first annular holder member located at the outer side of said trio plug device including means of such design as to be rigid enough for mechanical guidance of said plunger rod in its reciprocation while being yieldable enough for allowing a degree of swivelling upon exertion of radial stresses on said rod, an intermediate annular gastight seal of resilient material having a central axially extending lip surrounding said rod and in direct sliding frictional engagement therewith, and a second annular holder member located at the inner side of said trio plug device including further means for oil retention to lubricate said seal lip, said seal being tightly sandwiched between said first and second holder members.