Door activated airborne stair structure

Details Door activated airborne stair structure Door activated airborne stair structure

1975-11-07

1977-03-29

Blix, Trygve M.

Aeronautics and astronautics

Aircraft structure

Details

14 713, 105447, 182 78, 244137P, 49 37, 49387, B64C 124

Patent

active

040144860

ABSTRACT:
An air stair-door combination for an aircraft is described in which interference between the door and the stairway in opening and closing thereof is eliminated by delayed motion of the stairway until the door is moved through a significant portion of its travel. The stair being interconnected to the door counterbalances a portion of the weight of the door, thus decreasing power requirements for opening and closing the stairway and door. A folding handrail structure adapted to nestle into the folded stairway is described. The door and stair actuator operates on a pivot point located on the door such that initial opening movement of the door causes stair operating rods to first travel downwardly past an overcenter point, then upwardly through further movement of the pivot point. The stair segments are projected outwardly by stair actuator linkage means driven by the operating rods. The initial lost motion of the operating rods and stair actuator linkage permits the door to open sufficiently for the stair to clear the door during deployment.

REFERENCES:
patent: 2531263 (1950-11-01), Fink et al.
patent: 2541288 (1951-02-01), Rice
patent: 2547811 (1951-04-01), Burnelli
patent: 2933149 (1960-04-01), Lee
patent: 2990148 (1961-06-01), James
patent: 3047093 (1962-07-01), Cruz

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