Aeronautics and astronautics – Aircraft structure – Details
Patent
1983-03-28
1985-02-05
Blix, Trygve M.
Aeronautics and astronautics
Aircraft structure
Details
49254, B64C 114
Patent
active
044974620
ABSTRACT:
An outward opening plug-type cargo door for an aircraft is movable between a closed position in which the door blocks an entry opening into the aircraft and an open position in which the door is spaced from the entry opening. The door hinges are directly driven by irreversible rotary actuators. When the door is positioned adjacent the entry opening, a latch mechanism is operable to move the door between a latched and an unlatched position. In the latched position, the door is secured from outboard movement by a plurality of stop pins spaced about the periphery of the door that are located inboard of a series of stop pads mounted at spaced locations about the periphery of the door opening. When the latch mechanism is operated, the door is lifted to free the stop pins from their location behind the stop pads and permit outboard movement of the door. The movement of the door between the latched and lifted positions is programmed by a guide mechanism comprised of guide channels mounted on first and second edges of the door opening that are cooperably engaged by rollers rotatably mounted on first and second edges of the door. The guide channels have detents formed therein and the guide rollers engage the detents when the door is in the latched position and the pressure within the aircraft is greater than the pressure exterior to the aircraft. The detents resist upward vertical movement of the door to maintain the door securely in the latched position to prevent accidental blowout of the door caused by the pressure differential. A power unit is provided to operate the latch mechanism to move the door between the latched and lifted positions and a second power unit is provided to drive the door between the closed and open position. Sensor switches are positioned about the door and entry opening to sequence application of power to the two power units to open and close and latch and unlatch the door. A primary manual drive mechanism is provided coupled to the latch mechanism and the hinge mechanism to operate the latch mechanism and the hinge mechanism in the case of failure of the power unit. A secondary manual drive system is also provided coupled to the hinge mechanism to open and close the door upon failure of the power unit or the primary manual drive.
REFERENCES:
patent: 3751995 (1973-08-01), Carlson
patent: 3904049 (1975-09-01), Prahst
Blix Trygve M.
Corl Rodney
The Boeing Company
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