Aeronautics and astronautics – Aircraft structure – Details
Patent
1982-09-30
1985-12-24
Basinger, Sherman
Aeronautics and astronautics
Aircraft structure
Details
49254, 49201, B64C 114
Patent
active
045601232
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
An outward opening top hinged plug type aircraft door has a two segment door with the segments moving relative to each other between the door closed and locked position and the door unlocked and ready to be rotated outward position. The interior door handle for moving the door segment between these two positions operates linkages that gives fail safe locking of the mechanism at either position.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a fragmented side elevational view from the inside of an aircraft door with the locking mechanism of this invention.
FIG. 2 shows a cross-sectional view taken along line 2--2 of FIG. 1.
FIG. 3 shows a blown-up fragmented cross-sectional view, taken from the opposite direction, of the linkage of the locking mechanism in the door closed position.
FIG. 4 shows a view as in FIG. 3 with the locking mechanism in the door open position.
FIG. 5 shows a fragmented blown-up cross-sectional side elevational view of the fail safe feature of the locking mechanism.
DETAILED DESCRIPTION
A door locking mechanism 10 is used to control an outward opening, overhead pivoting, plug type aircraft door 12. The door is in two segments with a hinge carriage segment 14, and a translating door segment 16. The hinge carriage segment is secured to the lintel 18, above the door opening with a hinge 20. A torque tube 22 is secured to extend along the edge 24 of the hinge carriage segment. The translating door segment is mounted to be moved toward and away from the hinge carriage segment, with the door closed, sealed and locked when the segments are moved apart, and unlocked and ready to be rotated outward, when the segments are moved toward each other. FIG. 1 shows the door in the closed position. When in that position, door mounted stops 26 abut against side frame mounted stops 28. The stops in combination with guide rollers 30 in the side frames and cam fittings 32 in the door keep the door closed at pressure differentials encountered in flight. The door mounted stops and cam fittings move upward when the door segments are moved toward each other and clear the stops and cam fittings in the frame as shown in phantom lines in FIG. 1.
The door locking mechanism 10 provides for movement of the translating door segment 12, as well as for locking it. The segment translation is initiated by an inside door handle 34, that is secured to a shaft 36, which freely rotates, in response to door handle movement, in a pair of pillow blocks 38 that are mounted to the translating door segment. A set of three pillow blocks 40 are mounted to the translating door segment, and hold a freely rotatable shaft 42. A bellcrank 44 is mounted to the shaft. The bellcrank has an arm 46, which pivotally joins to linkage 48, which in turn is pivotally joined to an offset link 50, which is secured to the shaft 36. This offset link and the handle are joined to the shaft in a manner to maintain the same angle at all positions of the handle. The other arm 32, of the bellcrank, is actually a pair of arms secured to the shaft 42, and located to pivotally engage a pair of linkages 54, which in turn are pivotally mounted to torque tube 22. A set of guide links 56 are pivotally mounted at one end to the torque tube 22, and the other end is pivotally mounted to the translating door segment. A separate guide link is located near each end of the torque tube. A separate set of guide links 58 are mounted parallel to the first set and are pivotally mounted to extend between the two door segments. This mounting of the guide links acts as a four-bar linkage along each side of the door to move the translating door segment upward and inward as the door handle is raised. The linkage to the door handle is such that the handle is overcenter at the door closed and locked position, and also at the door unlocked and raised ready to be pivoted open position, to prevent unwanted movement at either position. A completely fail safe safety link 60 is also provided to prevent unwanted movement of the door at either position even if som
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Sealey Francis
Weiland Richard H.
Basinger Sherman
Case Morris A.
Corl Rodney
Donahue Bernard A.
The Boeing Company
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