Special Features:

Includes reinforcing chord that is positioned transversly on the truss of a bridge on rollers; raises and lowers deck units

Properties:

A manually 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.