OVER-RUNNING CLUTCH

摘要

An over-running clutch couples a motor driven shaft to a driven element in which the element can freely rotate when the motor is switched off. The driven shaft of the clutch includes a flattened portion with two flat surfaces. A wall of a coupling member engages one of the surfaces when the driven shaft stands still. The coupling member includes an outwardly extending cam which is received in a sleeve of a cylindrical collar positioned on a disk which is rotatably mounted on the driven shaft. When the shaft is rotated, the coupling member is pressed outward over a limited distance and the cam enters a recess provided in the inner wall of a cylindrical drive portion forming part of the driven element.