Shock absorber with sleeved piston

Claim 1

IN A HYDRAULIC SHOCK ABSORBER CONTAINING AN OIL FOR DISPLACEMENT THEREIN DURING OPERATION OF THE SHOCK ABSORBER, THE SAID SHOCK ABSORBER INCLUDING A CYLINDER HAVING A PISTON THEREIN HAVING A SLIDING FIT ENGAGEMENT WITH THE CYLINDER AND ECIPROCABLE THEREIN TO EFFECT DISPLACEMENT OF THE OIL IN THE SHOCK ABSORBER THROUGH RESISTANCE VALVING IN THE SHOCK ABSORBER ON RECIPROCATION OF THE PISTON IN THE CYLINDER, SAID PISTON COMPRISING A CYLINDRICAL BODY HAVING AN ANNULAR GROOVE IN THE PERIPHERY THEREOF AND AN ANNULAR CONTINUOUS AND NECESSARILY MOISTURE PRECONDITIONED CYLINDRICAL RING OF NYLON IN THE SAID GROOVE FORMING THE PISTON BEARING SURFACE IN INTIMATE SURFACE ENGAGEMENT WITH THE PISTON AND IN SLIDING ENGAGEMENT WITH THE CYLINDER THROUGHOUT THE AXIAL EXTENT OF THE SAID RING AND HAVING A MAXIMUM TOLERANCE OUTSIDE DIAMETER WHEN WATER SATURTED TO EQUILIBRIUM CONDITION THAT IS LESS THAN MINIMUM TOLERANCE INSIDE DIAMETER CYLINDER AND A MINUMUM TOLERANCE OUTSIDE DIAMETER WHEN DESATURATED THAT IS GREATER THAN MAXIMUM TOLERANCE OUTSIDE DIAMETER OF THE PISTON AND A MINIMUM INSIDE DIAMETER WITH THE RING SATURATED OR DESATURATED THAT IS LESS THAN MINIMUM TOLERANCE DIAMETER OF THE SAID GROOVE, TO INSURE THEREBY ENGAGEMENT OF THE CYLINDER WALL ONLY BY SAID NYLON RING AT ANY TIME AND AN INTERFERENCE FIT BETWEEN SAID RING AND GROOVE, SAID SHOCK ABSORBER ALSO CONTAINING WATER IN A STATE AVAILABLE FOR ABSORPTION BY SAID NYLON RING IN VOLUME AT LEAST EQUAL TO THAT REQUIRED TO EFFECT COMPLETE WATER SATURATION THEREOF REGARDLESS OF MOISTURE EQUILIBRIUM AS WELL AS AMBIENT TEMPERATURE VARIATION WITHIN A PRE-ESTABLISHED RANGE DURING OPERATION OF THE SHOCK ABSORBER.