Link 1 and housing 2 rotate freely about fixed axis A. Link 1 has profiled lobes a. Balls 3 are located between lobes a and the inside surface of housing 2. When link 1 rotates counterclockwise, balls 3 are jammed between lobes a and housing 2 which is thereby caused to rotate in the same direction. When link 1 rotates clockwise, balls 3 are released and housing 2 can rotate freely about axis A.
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