Aeronautics and astronautics – Aircraft structure – Passenger or cargo loading or discharging
Patent
1992-05-15
1993-12-07
Focarino, Margaret A.
Aeronautics and astronautics
Aircraft structure
Passenger or cargo loading or discharging
2441372, 198573, 198718, B64C 122
Patent
active
052677095
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. Three-phase voltage supplied to the selected set of drive units is thereby altered to provide only that voltage necessary to convey loads, and thus facilitates stalling of drive units supporting loads that have reached an end stop. This eliminates unnecessary roller wear and cargo deck maintenance.
REFERENCES:
patent: 3047127 (1962-07-01), McGow
patent: 3942625 (1976-03-01), Snead
patent: 4225926 (1980-09-01), Wendt
patent: 4662809 (1987-05-01), Sturtz et al.
Koharcheck Alan W.
Simons Robert L.
Ellis Christopher P.
Focarino Margaret A.
Lucas Western Inc.
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