A splined shaft head for engaging a splined hub includes first, second and third stages. The first stage has a conical taper on one side, and a cylindrical setback on the other side, which transitions through a tapered shoulder to the cylindrical body of the shaft head. The second stage includes lead...http://www.google.com.au/patents/US6482094?utm_source=gb-gplus-sharePatent US6482094 - Self-aligning splined male shaft head and engagement method
