Patent ID: 6863277

Claim:
A piston ring for surrounding a piston of a vibration damper, the piston being a flat disc-shaped piston having an upper side and a lower side and an outer circumferential surface, said piston ring composing: a jacket portion adapted to surround the outer circumferential surface of the piston; supporting segments connected to said jacket portion and defining holding surfaces adapted to axially support said jacket portion on the upper and lower sides of the piston, said jacket portion and said supporting segments of the piston ring forming a U-shaped cross-section, where said jacket comprises a base of the U-shaped section, said jacket extending axially by a length that is greater than the axial distance between said supporting segments; a seal carrier having at least one seal embedded thereon, said at least one seal being oriented to proceed from said seal carrier toward the piston when said jacket portion is supported by said supporting segments on the upper and lower sides of the piston; and a sealing lip arranged on a radially outer side of said piston ring, said sealing lip being arranged on a portion of said jacket extending axially outside of an area between said supporting segments.