Aircraft Cowl Latch Locking Assembly for Vibration-Safe Closure
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Solution Overview
Problem
Existing latch assemblies for aircraft cowls lack robust mechanisms to prevent inadvertent unlocking during vibrations, which can compromise the secure closure of aircraft components.
Innovation Solution
A latch assembly with a lock mechanism featuring a lever, spring, and catch system that secures the handle in the closed position by aligning the lever with the catch, preventing unintentional unlocking during vibrations, and includes a handle release device with a push button and secondary lock to maintain closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple latch mechanism is used for cowl closure, then the device complexity is reduced and ease of operation is improved, but the reliability deteriorates due to inadvertent unlocking during vibrations
Solution Approach 1:
The latch mechanism is divided into distinct functional components: a latch body with hook structure for engagement, a separate lock mechanism with lever and catch for securing, and a spring assembly for biasing. This segmentation allows each component to perform its specific function reliably while maintaining overall system integrity during vibrations.
Solution Approach 2:
The lock mechanism acts as an intermediary between the latch body and the cowl closure. The lever with catch provides an intermediate locking stage that prevents direct vibration-induced disengagement of the main latch hook, thereby enhancing reliability without requiring the entire latch system to be overly complex.
2Reliability
If a robust lock mechanism is added to prevent inadvertent unlocking, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The lock mechanism employs a movable lever that can rotate between engaged and disengaged positions, allowing dynamic response to vibration forces. The spring provides dynamic biasing that maintains engagement under normal conditions while allowing controlled release when needed, achieving high reliability through dynamic adaptation rather than static complexity.
Solution Approach 2:
The spring-loaded lever mechanism is self-regulating: the spring automatically maintains the lever in the engaged position during normal operation, and the lever's own geometry and the catch structure provide automatic disengagement pathways when vibration forces exceed threshold levels, eliminating the need for external control systems or complex actuation mechanisms.
3Ease of operation
If the latch mechanism includes a handle and hook structure, then the ease of operation is improved, but the reliability deteriorates due to potential handle displacement during vibrations
Solution Approach 1:
The handle operation and latch engagement functions are merged into a single integrated action. When the handle is actuated, it simultaneously moves the hook structure into engagement with the keeper and triggers the lock mechanism to secure the position, ensuring that ease of operation does not compromise reliability during vibrations.
Solution Approach 2:
The lock mechanism with lever and catch provides preliminary anti-action against vibration-induced handle displacement. The catch engages with the lever in a position that prevents the handle from displacing under vibration forces, while still allowing intentional handle operation when the lock is properly disengaged, thus maintaining both ease of operation and reliability.
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 assembly effectively prevents inadvertent opening of aircraft cowls during vibrations, ensuring secure closure and preventing accidental movement of aircraft components.
Implementation Method 1
The spring biases the lever axially along the axis in a direction towards the handle
Data Source
AI summary
An aircraft assembly includes a keeper, a latch and a lock. The latch includes a handle and a hook structure operatively coupled to the handle. The hook structure is engaged with the keeper when the handle is in a closed position. The hook structure is disengaged from the keeper when the handle is in an open position. The lock includes a catch, a lever and a spring. The lever is configured to rotate about an axis between a locked position and an unlocked position. The lever is aligned with the catch locking the handle in the closed position when the lever is in the locked position. The lever is misaligned from the catch unlocking the handle from the closed position when the lever is in the unlocked position. The spring biases the lever axially along the axis in a direction towards the handle.