Importance

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Abstract

A rotary coupling comprises a driving part, a driven part, and a fixed part in which the driving and driven parts are rotatable coaxially. Coupling units are provided to be in torque-transmitting engagement with driving and driven parts. Coupling units are juxtaposed to an annular braking surface of the fixed part, and are free to move into and out of engagement with the braking surface. Each coupling unit includes a wedging surface and a bearing surface. A driving torque, applied by the driving part to the coupling units, is transmittable to the driven part without engagement of the coupling units with the braking surface. A reverse torque, applied by the driven part to the coupling units, first moves the bearing surface into non-wedging engagement with the braking surface and then progressively moves the wedging surface into progressive wedging engagement with the braking surface.

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First Claim