Drive coupling

Claim 1

A universal drive coupling element adapted to be mounted on a first, rotatable shaft to form a drive connection with a second shaft comprising, a cylindrical, molded plastic coupling member, a plurality of symmetrically disposed axially projecting forward end portions operable to form a slideable, torque transmitting, engagement with a similar coupling element oppositely disposed on a second shaft, a rearwardly extending cylindrical body member, an axially disposed bore extending inwardly from the rearward end of said member to slideably receive said first shaft therein, an annular metal member integrally molded in said rearward body member concentric with said shaft receiving bore, and having a central opening whose surface is contiguous with and forms a longitudinal segment intermediate the ends of said shaft receiving bore, a radially disposed threaded member extending through the wall of said rearward body member and said annular metal insert threadedly engaged with said metal insert and engagable with (a) the shaft in said bore, said first shaft contains a longitudinal key slot and having a projecting locking member in lateral engagement with said annular member that projects into said key slot to resist relative rotation of said coupling member and said first shaft.