Drum 1 is rigidly attached to crank 2 of four-bar linkage ABCD. Flexible link 6, wound on drum 1, runs over pulley 5 which rotates freely about axis E. When crank 2 is rotated counterclockwise or clockwise about fixed axis A, load 7 is raised or lowered, and a supplementary vertical reciprocating motion is imparted to the load by the oscillation of rocker arm 4 about fixed axis D.
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