Aircraft Hinge Structure with Quick-Release Pin for Obstruction-Free Access
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Solution Overview
Problem
In aircraft applications, the removal of hinged doors or panels is hindered by obstructions such as thermal blankets that obscure access to the hinge pin, requiring users to bend or remove the blanket, which is not ideal.
Innovation Solution
A gooseneck hinge system with a clamp and retaining mechanism that allows the hinge to be rotated and decoupled from the pin, enabling quick removal or installation of the door without disengaging the hinge pin, using a slot and through holes for coupling and a quick-release mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hinge pin is used to support the hinged door, then the door can be securely mounted and rotated, but the removal of the door is impeded by obstructions such as thermal blankets that obscure access to the hinge pin
Solution Approach 1:
The hinge assembly is divided into separate functional components: the hinge body mounted on the door, the attachment mechanism mounted on the aircraft structure, and the hinge pin connecting them. This segmentation allows the hinge pin to be selectively engaged or disengaged without requiring access to the entire hinge assembly, enabling door removal even when thermal blankets obscure part of the hinge area.
Solution Approach 2:
The hinge pin acts as an intermediary element between the hinge body and the attachment mechanism. By designing the pin as a separate, removable component with engagement features (such as slots and retaining clips), the system allows for quick connection and disconnection of the door without requiring direct manipulation of the hinge body or attachment mechanism, thus overcoming obstacles like thermal blankets.
2Ease of operation
If the hinge pin is removed to take down the door, then the door can be completely detached, but the process is complicated by the need to access and manipulate the pin through obstructions
Solution Approach 1:
The hinge pin is pre-configured with engagement features (slots, retaining clips, or quick-release mechanisms) that allow for rapid insertion and removal. The pin is designed to engage with corresponding features on the hinge body and attachment mechanism, enabling quick detachment without requiring time-consuming manipulation or removal of thermal blankets.
Solution Approach 2:
The hinge pin incorporates self-aligning or self-locking features that automatically engage with the hinge body and attachment mechanism when inserted, and can be easily released by simple manual action. This self-service design reduces the time and effort required to remove the pin, eliminating the need for complex manipulation through obstructions.
3Temperature
If a thermal blanket is installed to provide thermal insulation, then thermal protection is improved, but access to the attachment mechanism and hinge pin is obscured
Solution Approach 1:
The hinge pin and its engagement features are extracted as separate, accessible components from the main hinge assembly. The pin can be engaged or disengaged from external access points that are positioned to be visible and accessible even when thermal blankets are installed over portions of the hinge area. This extraction allows the thermal blanket to remain in place for insulation while maintaining access to the critical pin manipulation points.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A system configured for installing or removing a door (104) from an aircraft, comprises: a pin (108), a hinge (202) comprising a slot (208) that forms a cavity for rotatively coupling the hinge (202) and the pin (108), a clamp (210) coupled to the pin (108), and a retaining mechanism (216) on the clamp (210) that selectively bears against the hinge (202) to maintain the pin (108) in the cavity when the retaining mechanism (216) is engaged and releases the hinge (202) when the retaining mechanism (216) is disengaged.