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A winch with a cable suspending a silo unloader in a silo; the winch having a gear mechanism and an input shaft operating a worm; a reversible motor connected with the input shaft; an incremental drive for incrementally turning the input shaft for incrementally paying out the cable including a slow

A winch with a cable suspending a silo unloader in a silo; the winch having a gear mechanism and an input shaft operating a worm; a reversible motor connected with the input shaft; an incremental drive for incrementally turning the input shaft for incrementally paying out the cable including a slow speed motor with a revolving eccentric operating an oscillating drive arm, with a pawl to incrementally rotate a ratchet wheel coupled by a magnetic clutch to a drive plate affixed on the input shaft.

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A drive mechanism for a cable, comprising a winch including a drum upon which such a cable is wound and payed out and a speed-reducing gear mechanism including an input shaft to revolve a worm, a reversible motor having an output shaft connected to the input shaft by chain and sprockets to rapidly r

A drive mechanism for a cable, comprising a winch including a drum upon which such a cable is wound and payed out and a speed-reducing gear mechanism including an input shaft to revolve a worm, a reversible motor having an output shaft connected to the input shaft by chain and sprockets to rapidly revolve the input shaft and drum, a slow speed motor with an output eccentric, an oscillatable drive arm freely mounted on one of said shafts for rocking movement and having a drive pawl thereon, the drive arm being connected to the output eccentric of the slow speed motor, a ratchet wheel of magnetic material on said one shaft and being freely rotatable with respect to said one shaft, the ratchet wheel engaging the drive pawl to be rotated thereby, and a drive plate affixed to said one shaft and rotatable therewith in face-to-face and spaced relation to the ratchet wheel, the plate having a plurality of magnets affixed thereto and bearing against the side of the ratchet wheel and defining a releasable drive connection to the ratchet wheel. A drive mechanism for a winch with a worm gear speed reducing mechanism, comprising a reversible motor having a non-slip driving connection for coupling to such a speed reduction mechanism, a rotary coupling means in driving relation to said driving connection, a rotary driver adjacent the coupling means, powered means incrementally and repeatedly turning the rotary driver and including a source of oscillating motion, and a clutch between the rotary driver and the coupling means and having a torque responsive slip characteristic to slip in response to predetermined torque applied therethrough.