Oldham electrically isolating couplings from Ruland Manufacturing are three-piece couplings manufactured with two hubs and one centre disk in acetal for high torsional stiffness, or nylon for vibration and shock absorption. Torque transmission is accomplished by mating the slots in the centre disk and the drive tenons on the hubs with a slight press fit for zero backlash. The disk slides on the tenon to allow for a relatively large amount of parallel misalignment. Oldham couplings are electrically isolating and can act as a mechanical fuse. If the plastic insert fails, it breaks cleanly and does not allow any transmission of power, thus preventing damage to more expensive components.
Reader Service Card No. 315