Abstract: A torque and air gap adjustment mechanism is provided for a spring engaged electromagnetic brake or clutch, and consists of a plurality of hubs threaded to one another and to the brake casing for axial movement with respect thereto and with respect to each other. A plurality of detents are disposed within the hub positioned in cylindrical holes with springs forcing them away from each other and out of the holes. These detents are retained in the holes at one end by a hub provided for the torque adjustment and at the other end by the brake plate. In both the hub and the brake plate there are indentations to retain the detents. These indentations have differing angles as do the engaging surfaces of the detents to permit torque adjustment independent of air gap adjustment upon rotation of the torque adjusting hub.

Abstract: An electromagnetic friction device for torque transmission including an input member and an output member. A mechanism for transmitting torque from the input member to the output member is provided. The torque transmitting mechanism includes an adjustable friction ring member, an inner ring member threadably disposed in the friction ring member and a biasing mechanism. The biasing mechanism urges the adjustable friction ring member into engagement with the input member. An electromagnetic actuating mechanism is mounted adjacent to the output member to move the friction ring member into and out of engagement with the input member. An adjusting mechanism of the electromagnetic actuating mechanism is adapted to adjust the magnetic armature member with respect to the adjustable friction ring member. The adjusting mechanism includes a helical biasing member mounted on a connector which connects the armature member to the friction ring member.