Slotted coupling of fan rotor to shaft of driving motor - incorporates nut which is tightened in one direction of rotation by friction at end of shaft, and loosened in opposite direction

摘要

The hub (11) of the rotor (10) is in the form of a blind hole with a hexagonal cross-section within which a nut (15) is urged against the threaded end (22) of the driving shaft (21) by a helical spring (16) bearing against the cover (17). When the motor (20) runs in the direction of advance, the nut is automatically tightened by friction. In the opposite direction of rotation the nut is freed, and on reversal the spring forces it on to the thread (23). USE/ADVANTAGE - In clothes-dryer or similar application, uniform tightening torque of nut on shaft can be guaranteed throughout longer prodn. run.