Apparatus for prevention of coming off in universal joint

Abstract From the Canadian patent

The invention provides a universal joint comprising a tubular outer member adapted to be coupled to a first shaft and provided with a plurality of longitudinal parallel sliding grooves on its inner surface, an inner member adapted to be coupled to a second shaft and provided with a plurality of members having a spherical surface in engagement with the respective sliding grooves, and an annular closure member arranged over an open end of said tubular member and provided with respective concave portions facing said respective members in the respective sliding grooves, the respective inner surfaces of said concave portions being formed to conform substantially to the shape of said spherical …