Articulated Aircraft Door Hinge With External Linkage Layout
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Solution Overview
Problem
Conventional hinge assemblies for translating-motion-type aircraft doors are bulky and occupy significant space within the fuselage, limiting its availability for other purposes such as stowage or seating, due to the mechanical linkage extending into the interior.
Innovation Solution
An articulated hinge assembly with a low-profile design that includes an articulated hinge arm, linkage assembly, and emergency power assist mechanism, allowing the door to move along a programmed path while maintaining a parallel orientation to the fuselage, and minimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical linkage is used to control door rotation, then door positioning is improved, but space occupancy increases
Solution Approach 1:
The patent repositions the mechanical linkage from extending into the fuselage interior to being located outside the fuselage, utilizing external space. The linkage assembly includes linkages that connect the door to the fuselage structure, with the mechanism positioned in the external environment rather than occupying internal volume, thereby resolving the space occupancy issue while maintaining door positioning control capability
Solution Approach 2:
The mechanical linkage is designed with a compact, folded configuration that can be nested or collapsed when not in use. The linkage assembly includes multiple linkages that can be arranged in a compact manner, reducing the space required while maintaining the functional capability to control door rotation and positioning
2Reliability
If a bulky mechanical linkage is used, then door control reliability is improved, but space availability deteriorates
Solution Approach 1:
The patent relocates the mechanical linkage system from the internal fuselage space to an external position, allowing the door control mechanism to operate reliably without encroaching on the interior space available for passengers and cargo. The linkage connects the door to the fuselage through an external path, maintaining control reliability while preserving internal space availability
Solution Approach 2:
The mechanical linkage is divided into multiple separate linkages that can be arranged in a compact configuration. This segmentation allows the control mechanism to be distributed across multiple smaller components rather than requiring a single bulky structure, thereby maintaining reliability through distributed control while reducing overall space requirements
Data Source
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AI summary
An articulated hinge assembly for connecting a door to a fuselage of an aircraft includes an articulated hinge arm having a first hinge member pivotably coupled to a second hinge member at an elbow. The first hinge member includes a fuselage fitting pivotably coupled to a fuselage bracket. The second hinge member includes a door fitting pivotably coupled to a door bracket of the door. The articulated hinge assembly includes a linkage assembly coupled to the articulated hinge arm, the fuselage fitting and the door fitting. The linkage assembly includes a hinge linkage assembly coupled to the articulated hinge arm and the fuselage fitting and controlling movement of the hinge members relative to each other and relative to the fuselage fitting. The linkage assembly includes a door linkage assembly coupled to the articulated hinge arm and the door to control positioning of the door between open and closed positions.