Seal for ligature joint

Claim 1

IN A TENSION TRANSMITTING FRICTION JOINT HAVING A PAIR OF OVERLAPPING FLAT STRAP PORTIONS OF PLASTIC MATERIAL COMPRESSED TOGETHER BY A WRAP AROUND SEAL OF BODY MATERIAL HARDER THAN THE PLASTIC STRAP MATERIAL, SAID SEAL COMPRISING A BODY OF SHEET STOCK PROVIDING A CENTER WALL HAVING LATERAL EXTREMITIES EACH INTEGRALLY MERGING THROUGH A LENGTHWISE ELONGATED RETURN BEND PORTION WITH AN INDIVIDUAL MARGINAL FLANGE THAT LAPS THE ADJACENT PORTIONS OF THE CENTER WALL, SAID CENTER WALL AND SAID FLANGES PRESENTING SIDE BY SIDE SETS OF OPPOSED SURFACES COOPERABLY COMPRESSING THE CONTACTED STRAP PORTIONS TOGETHER IN DIRECT FULL SURFACED FACE TO FACE CONTACT, EACH OF SAID OPPOSED SURFACES HAVING A LAYER OF HARD PARTICULATE MATERIAL IMMOVABLY SECURED IN A UNIFORMLY DISTRIBUTED RELATION THEREON BY ADHERENT BOND MATERIAL, SAID PARTICULATE MATERIAL HAVING FRICTIONAL BITING ENGAGEMENT PARTLY INTO THE STRAP PORTION ENGAGED THEREBY WHEN THE STRAP PORTIONS ARE COMPRESSED IN LAPPED RELATION BETWEEN THE SETS OF OPPOSED SURFACES PRESENTED BY THE FLANGES AND THE CENTER WALL.