| 摘要 |
A winch suitable for construction in a pocket-sized version for lightweight winching operations has a rotatable spool assembly slidingly received between horizontal guide rails of a cage having oppositely disposed vertical sideplates joined by upper and lower dowels. A load-carrying strap is wrapped around a drum of the spool, with upper and lower strap ends respectively passing tangentially off the drum around opposite sides of the upper and lower dowels. An intermediate point of the strap wraps around a third dowel joining the spool flanges at an interval from the drum, so that as the spool is rotated the strap will be double-wrapped about the drum to shorten the distance between its ends. Compact construction is provided by an internal wave gear speed reduction mechanism that enables rotation of the spool drum at a speed less than rotation of a central drive shaft. The shaft has a square bore to be turned by passing a sprocket wrench driver through aligned bores of the cage sideplates. The sideplate bores have straight sides to prevent turning the driver when the spool is off center.
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