The piston and cylinder assembly with a sealing ring in a recessed bearing and associated seal ring

摘要

PCT No. PCT/GB86/00542 Sec. 371 Date Jul. 1, 1987 Sec. 102(e) Date Jul. 1, 1987 PCT Filed Sep. 12, 1986.A sealing ring (10) includes a plurality of circumferentially spaced axially directed projections (20) on one radial face thereof. In use, the sealing ring is located within a seating groove which is wider than the spacing between the radial faces a (11,12) of the sealing ring, the projections (20) holding the ring against axial movement within the groove while allowing the ring to swell in the axial direction in between the projections so as to maintain the dimensional stability of the outer face (14) of the ring. The sealing ring is particularly useful in uni-directionally operative hydraulic dampers and door closers incorporating such dampers.