Aircraft Sliding Door Locking Mechanism Redundancy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aircraft door locking mechanisms are complex, lack redundant systems, and require immediate intervention during malfunctions, leading to increased maintenance times and difficulties in procedures.
Innovation Solution
A simpler locking mechanism using a hook mechanism with a push-pull cable and elastic elements that allows automatic locking and release of sliding passenger doors without lifting, incorporating a redundant locking system for reliability and lighter components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex locking mechanism is used to ensure door security, then reliability is improved, but device complexity increases and maintenance difficulty worsens
Solution Approach 1:
The locking mechanism is divided into separate functional components: a primary locking system with cam and latch, and a secondary redundant locking system with independent latch. This segmentation allows each component to be simpler while maintaining overall reliability through the combination of multiple independent systems.
Solution Approach 2:
A redundant locking system is incorporated as a backup mechanism that automatically engages if the primary locking system fails. This beforehand cushioning ensures door security is maintained even when the primary system malfunctions, resolving the contradiction between reliability and complexity by providing fail-safe protection.
2Reliability
If a redundant locking mechanism is added to prevent immediate intervention during malfunction, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent incorporates a redundant locking system with independent latch and cam mechanisms that automatically engage if the primary locking system fails. This beforehand cushioning provides fail-safe protection without requiring complex control systems, as the redundancy is achieved through mechanically independent parallel systems.
Solution Approach 2:
The redundant locking system uses simpler, more robust mechanical components that can be easily replaced if needed. Rather than using complex electronic or programmable systems, the patent employs durable mechanical redundancy that prioritizes simplicity and replaceability over long component life.
3Reliability
If the door locking mechanism uses heavier components for stability, then reliability is improved, but weight of moving object increases
Solution Approach 1:
The patent employs cam mechanisms that use the door's own weight and gravitational force to assist the locking action. The cam geometry is designed so that the door's weight provides a mechanical advantage, reducing the force and weight of additional components needed to achieve reliable locking.
Solution Approach 2:
The cam mechanisms use curved surfaces and spherical contact points to distribute loads and reduce stress concentrations. This curvature allows for lighter components while maintaining structural integrity and locking reliability, as the distributed contact areas reduce the need for heavily reinforced parts.
4Device complexity
If a manual handle locking system is used, then device complexity is reduced, but ease of operation worsens during emergencies
Solution Approach 1:
The locking mechanism is designed to automatically lock when the door reaches the fully open position through the cam and latch geometry. This self-service locking eliminates the need for manual intervention during normal operation, while the separate manual handle provides direct mechanical access to the latch for emergency release without requiring complex electronic 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
Enables safe and efficient locking and release of aircraft doors in open positions during flight or parking, reducing maintenance needs and ensuring door stability even in case of component failures, with improved operational efficiency and reduced power requirements.
Implementation Method 1
at least an elastic element (7) which forces said hook mechanism (6) to stay inside said guide rail (R)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a locking mechanism (1) that provides for the door moving inside a guide rail in aircrafts to stay safely at an open position and released during a flight or when the aircraft is parked. Said mechanism (1) which enables the doors of aircrafts to be slid upwards and to be locked at a predetermined position, provides the door to be locked at a fully open position and to be suspended and released when desired.