Abstract: A Hooke's joint comprises four bearing cups received in openings in respective yoke arms and retained therein by respective retaining elements. At least one retaining element associated with each yoke has radially-projecting fingers which terminate in cutting edges and which are seated in a groove cut in the wall of the corresponding opening by rotation of the retaining element. There is also described a tool for contracting the retaining element to enable it to be inserted into the opening and for rotating the retaining element.

Abstract: In a Hooke's joint comprising two yoke elements interconnected by a connecting member, the connecting member has trunnions received in respective bearing cups which are fitted in apertures formed in the arms of the yoke elements. Each arm of each yoke element has a retaining element to retain the associated bearing cup in the opening of the arm. The retaining element on one arm of each yoke element is adapted to bias the associated bearing cup towards the centre of the joint; whereas the retaining element on the other arm of the yoke element is adapted to function as a rigid stop to limit movement of the associated bearing cup away from the centre of the joint but not to bias the bearing cup inwardly of the joint.