A power operated mechanical device having a horizontally mounted revolvable drum(s) on the periphery of which the end of a rope, line, or chain is secured for exerting a raising, lowering, or pulling motion. the device may also contain a revolvable head(s) or spool(s) (gypsy head) around which one or more turns must be taken for exerting pulling power. see also winch, gypsy. it may include a power unit. excludes those items designed for mounting on self-propelled vehicles.