ABSTRACT
A spring-loaded retracting key is forced to move outwards if overload occurs. The rubber pad forces the key into the slot so that clutch is enabled and has to be reset. This is done to prevent wear. The key is reset by pushing on it through a reset hole. A detenting action is used to couple the two clutch halves together. If overload occurs, the ball or balls are forced out of engagement and the two halves rotate relative to each other. If overload occurs frequently, wear is excessive. Splined sleeve is pressed against a pinned sleeve. Both sleeves are angle-cut. The spring force determines the torque that can be transmitted from the splined to the pinned shaft. Two-speed drive for grinding wheel can be simple, in-line design if overrunning clutch couples two motors. Outer race of clutch is driven by gearmotor; inner race is keyed to grinding-wheel shaft.
