Aeronautics and astronautics – Aircraft structure – Details
Patent
1981-12-09
1984-06-12
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft structure
Details
2441296, 2441183, 49131, 280166, 2923363, 292 36, 105430, 105437, 105447, 296 62, 182 77, B64C 124
Patent
active
044536844
ABSTRACT:
Upper and lower sectional doors of rectangular configuration are mounted within an aircraft fuselage door frame and hinged for pivoting about horizontal axes at the upper and lower horizontal edges of respective door sections. A step is mounted to the interior of the lower door for pivoting along one horizontal edge about a horizontal axis between a first position with the step flush with the door interior and a second position projecting generally at right angles thereto. A plurality of laterally slidable latch pins fixed to the lower door section along vertical side edges are projectable into holes within the fuselage doorframe through a linkage system coupled to a shaft pivotably mounting the step to the door. The latch pins are projected to latching position when the step is folded flush to the door and retracted to unlatched position by manual movement of the step to its projected position prior to opening the lower door.
REFERENCES:
patent: 287880 (1883-11-01), Small
patent: 1216436 (1917-02-01), Gillingham
patent: 2056226 (1936-10-01), Mussey et al.
patent: 2196546 (1940-04-01), Bowers
patent: 2910255 (1959-10-01), Johnson
Barefoot Galen L.
Omac, Inc.
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