Leg rope for a surfboard

Claim 1

A leg rope to connect a surf board to a surfer, said rope comprising a helically coiled extensible member made of resilient material, an anchoring member fixed to one end of the coiled member whereby the extensible member can be anchored to a surf board, a cuff to engage around the leg of a surfer, a swivel connecting the cuff to the other end of the extensible member, said swivel including two components, the first component comprising a body having a hole therethrough, radially disposed grooves across a face of the body in a plane at right angles to the axis of said hole through the body, an arched member extending over the grooved body face with the ends of the arched member fixed to the body and the cuff fixed to the arched member, the second component comprising a swivel including a shank with one end of the shank fixed to the other end of the coiled member, said shank located in the hole through the body of the first swivel component with abundant clearance therebetween, a head on the shank located between the arched member and the grooved face of the first swivel component, radially disposed lugs on the underface of the head on the shank engageable in the radial grooves of the first swivel component, said grooves and lugs being respectively concave and convex and complementarily dimensioned and substantially semi-circular with radiused edges where the grooves meet the face of said body of the first swivel component said grooves and lugs being dimensioned as to prevent relative rotational movements between said components when a tension force is applied and permits relative rotational movements between said components when the tension force is released.