Abstract: Provided are a portable winch assembly for use in lifting equipment and a planetary reduction gearbox that may be incorporated into existing winch assemblies. The planetary reduction gearbox of the winch assembly includes a primary sun gear, a first plurality of planet gears, a secondary sun gear, a second plurality of planet gears, and a ring gear. The primary sun gear is fitted with a drive head, which is configured for engagement by a handheld torquing device, such as an electric drill. The rotation of the primary sun gear results in the subsequent rotation of a cooperatively engaged gear-driven lifting assembly, to which a rope, cable, or strap may be attached for hoisting equipment. Optionally, a handle assembly may also be included, the handle being selectively disengageable from the lifting assembly, so that the handle may be remain stationary with respect to the rotation of the primary sun gear.

Abstract: Provided are a portable winch assembly for use in lifting equipment and a planetary reduction gearbox that may be incorporated into existing winch assemblies. The planetary reduction gearbox of the winch assembly includes a primary sun gear, a first plurality of planet gears, a secondary sun gear, a second plurality of planet gears, and a ring gear. The primary sun gear is fitted with a drive head, which is configured for engagement by a handheld torquing device, such as an electric drill. The rotation of the primary sun gear results in the subsequent rotation of a cooperatively engaged gear-driven lifting assembly, to which a rope, cable, or strap may be attached for hoisting equipment. Optionally, a handle assembly may also be included, the handle being selectively disengageable from the lifting assembly, so that the handle may be remain stationary with respect to the rotation of the primary sun gear.