Aircraft Overhead Bin Net Locking Mechanism
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Solution Overview
Problem
Aircraft overhead stowage bins pose a safety risk due to shifting luggage during flight, potentially causing injuries from falling items, especially during turbulence, and overloading which can lead to spontaneous bin opening.
Innovation Solution
An overhead stowage bin system featuring a net and locking mechanism that extends along the cabin door, secured by a spring mechanism and projections, to restrain luggage and prevent it from falling, while allowing the door to open independently for inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a net is added to restrain luggage, then safety against falling items is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is divided into separate components: a locking member with a projection and a locking recess with a biasing member. This segmentation allows each component to perform its specific function independently while working together to achieve the overall locking objective, resolving the contradiction by making the safety mechanism modular rather than monolithic.
Solution Approach 2:
The biasing member automatically engages the locking member with the locking recess when the door closes, and automatically releases it when the door opens. This self-service mechanism eliminates the need for manual operation or complex control systems, providing safety through automatic engagement and disengagement while keeping the device simple.
2Reliability
If the net is locked to the cabin door, then luggage restraint is improved, but ease of door operation worsens
Solution Approach 1:
The locking mechanism transitions dynamically between locked and unlocked states based on door position. During normal door operation, the mechanism automatically locks when closed and unlocks when opened, adapting to the operational phase without requiring manual intervention. This dynamic behavior maintains luggage restraint during flight while preserving ease of door operation during boarding and deplaning.
Solution Approach 2:
The biasing member is pre-loaded to automatically engage the locking mechanism before the door is fully closed during normal operation, preventing accidental opening. However, during intentional door opening operations, the door's movement automatically overcomes this preliminary locking action, allowing easy door operation when needed while maintaining restraint during flight.
3Reliability
If overloading protection is added to prevent spontaneous bin opening, then safety is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is designed to automatically engage when the door closes, creating a pre-loaded locking state that can withstand overloading forces. The biasing member is pre-compressed to provide immediate locking force, preventing spontaneous opening due to overloading without requiring additional sensors or control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively secures luggage during turbulence, reducing the risk of injury and simplifying crew operations by maintaining net tension and allowing secure door opening without compromising luggage restraint.
Implementation Method 1
The locking mechanism maintains a tension of the net such that the net compelled to retract via the spring mechanism prevented by the engagement between the first projection and the second projection
Implementation Method 2
a biasing member disposed along the cabin door and operably coupled to the first projection such that the biasing member is configured to bias the first projection toward the second projection
Data Source
AI summary
An overhead stowage bin includes a ceiling panel, a back panel, a lower panel, and a plurality of side panels, a cabin door, a net, and a locking mechanism. The ceiling panel, the back panel, the lower panel, and the plurality of side panels defining a volume configured to stow luggage. The cabin door is configured to enclose the volume and configured to rotate about a hinge disposed on the ceiling panel. The net is configured to extend along the cabin door in an extended position. The locking mechanism is configured to lock the net to the cabin door.