Abstract: A winch or a hoist (100) includes an input shaft, a rotatable dmm (112), and a gearbox (120) including a plurality of high-contact ratio spur-type gears, the gearbox coupled to the input shaft and to the rotatable dmm such that rotation of the input shaft at a first speed drives rotation of the rotatable drum at a second speed that is different than the first speed.

Abstract: A rotary encoder may include a housing having an input-side portion and an output-side portion, and an internal cavity formed therein. The housing and its internal cavity can house a central shaft configured to transfer torque from an output shaft of a motor to an input shaft of a mechanical device such as a winch or a hoist. The housing and its internal cavity can house other components including printed circuit boards, an encoder disc, a ball bearing, and a seal.

Abstract: A rotary encoder may include a housing having an input-side portion and an output-side portion, and an internal cavity formed therein. The housing and its internal cavity can house a central shaft configured to transfer torque from an output shaft of a motor to an input shaft of a mechanical device such as a winch or a hoist. The housing and its internal cavity can house other components including printed circuit boards, an encoder disc, a ball bearing, and a seal.

Abstract: A wrench (10) is disclosed for breaking a threaded connection between first and second pipe sections (14, 16) having wrench flats (18). A first jaw (20) is pivotally secured to a first torque arm (22) and slid over the wrench flats of the first pipe section. A second jaw (54) is pivotally secured to a second torque arm (56) and slid over the wrench flats of the second pipe section (16). A threaded rod (70), with a handle (72) thereon, is threaded between the distal ends of the torque arms so that the distal ends of the torque arms can be brought together by rotating the threaded rod with the handle to break the connection. The jaws (20, 54) are interchangeable and jaws of different size can be used to fit pipe sections of different diameter. Further, the jaws have a plurality of pivot pin apertures (26-38) around their circumference to permit the jaws to be adjusted on the torque arms to position the jaw on the wrench flats of the pipe sections.