Abstract: A variable power conveyance apparatus for propelling loads under environments where the angle of inclination of a conveyance path may change. For these apparatuses, in particular, those located in aircraft cargo bays, drive units are constructed to drive heavy loads under all conditions, including up a slope. These drive units may be organized into sets for loading pallets into and out of the aircraft and along the left and right storage tracks within fore and aft sections of the aircraft. An inclinometer senses the aircraft's angle of inclination and generates a representative electronic signal. Control logic determines whether to apply, via an SCR circuit, a minimum voltage or a greater variable voltage if the selected set of drive units is called upon to drive the pallets up a slope.

Abstract: A system for conveying heavy loads or pallets that includes a conveyor device and a frictional pivot device for rotating these loads. The pivot device has a normal position below the conveyance plane, out of contact with a load, and is moved towards into frictional engagement with the load so as to form a pivot axis, the load being continually supported by the conveyor device. The conveyor device then drives the load, which is pinned at the pivot axis, such that the load is pivoted. When the desired rotation is achieved, the pivot device is lowered so that the load may be moved away.