Sealing ring with assembly means

Claim 1

IN A FLUID PRESSURE ACTUATED CYLINDER ASSEMBLY, A ONE-PIECE PISTON HAVING AN OUTER DIAMETER SUBSTANTIALLY LESS THAN THE INNER DIAMETER OF A SURROUNDING CYLINDER, SAID PISTON HAVING ONE RIM EDGE DEEPLY BEVELED TO PROVIDE A PILOT SURFACE OVER WHICH A SEALING RING CAN BE EXPANDED TO ASSEMBLE THE SAME INTO A SEATING GROOVE, A RADIALLY DEEP AND WIDE ANNULAR GROOVE OPENING OUTWARDLY THROUGH THE PERIPHERAL WALLS OF SAID PISTON AND SPACED CLOSE TO SAID BEVELED RIM EDGE, THE SIDE WALLS OF SAID GROOVE DIVERGING OUTWARDLY FROM THE BOTTOM OF THE GROOVE AT AN ACUTE ANGLE TO A PLANE NORMAL TO THE PISTON AXIS, A ONE-PIECE CONTINUOUS SEALING RING MEMBER OF RESILIENT ELASTIC MATERIAL CAPABLE OF BEING EXPANDED SUFFICIENTLY FOR FORCED ASSEMBLY OVER THE BEVELED RIM EDGE OF SAID PISTON AND TO THEN CONTRACT INTO SNUG-FITTING SEATING ENGAGEMENT WITH THE DIVERGING SIDE WALLS OF SAID ANNULAR GROOVE, SAID SEALING RING BEING OF HOMOGENEOUS MATERIAL AND HAVING A THICKWALLED RADIALLY-DISPOSED ANNULAR MAIN BODY CENTRALLY THEREOF COMPLEMENTAL IN SHAPE TO THE ANNULAR TAPERING RESILIENT SEALING LIPS FLARING IN OPPOSITE GENERALLY AXIAL DIRECTIONS FROM JUNCTIONS WITH THE OUTER RIMS OF SAID MAIN BODY, THE THICKEST PORTION OF SAID LIPS BEING AT THEIR JUNCTION WITH SAID MAIN BODY AND TAPERING TO A RELATIVELY THINNER BUT BLUNT OUTER SEALING EDGE, THE INNER SURFACES OF SAID LIPS BEING SPACED FROM THE UNDERLYING PERIPHERAL WALL OF SAID ONE-PIECE PISTON TO PERMIT LIMITED FLEXING OF SAID LIPS ABOUT THEIR JUNCTIONS WITH THE MAIN BODY OF THE SEAL WITHOUT INTERFERENCE FROM THE PISTON SIDE WALL, THE OUTER SURFACES OF SAID LIPS CONVERGING TOWARD THE SEAL BODY AT VERY ACUTE ANGLES WITH RESPECT TO THE INNER SURFACE OF SAID CYLINDER AND INTO MERGER WITH THE OPPOSITE EDGES OF A RADIALLY SHALLOW BUT RELATIVELY WIDE GROOVE FORMED IN THE OUTER PERIPHERY OF SAID MAIN BODY BETWEEN THE JUNCTIONS OF SAID LIPS THEREWITH.