Aircraft Nacelle Hook Latch With Nested Handles for Easy Access
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Solution Overview
Problem
Existing aircraft nacelle cowl latches are difficult to access, leading to ergonomic challenges and increased complexity.
Innovation Solution
A latch design with a dual-handle mechanism where the second handle blocks the first handle in the closed configuration, forming a continuous surface, and a sliding body mechanism for easy access and ergonomic operation, integrated with a telescopic device for enhanced safety and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch is positioned under the nacelle to achieve secure closure, then the reliability of cowl assembly is improved, but the ease of operation deteriorates due to difficult access
Solution Approach 1:
The patent introduces a telescopic device that extends the latch assembly upward from the lower edge of the first cowl toward the upper edge, effectively moving the operational interface from a difficult-to-reach lower position to an accessible upper position. This dimensional extension allows operators to easily access and operate the latch while maintaining its secure positioning under the nacelle.
2Device complexity
If a single latch mechanism is used to simplify the device structure, then the device complexity is reduced, but the reliability of securing both cowls deteriorates
Solution Approach 1:
The patent designs a universal latch mechanism with two handles that can simultaneously secure both the first and second cowls. The first handle secures the first cowl while the second handle secures the second cowl, and both handles can be operated independently or together. This multi-functional design maintains simple device structure while ensuring reliable securing of both cowls.
Solution Approach 2:
The patent implements a nested handle configuration where the second handle can be positioned within or alongside the first handle structure. The second handle blocks the first handle in the closed configuration, creating a compact nested arrangement that simplifies the overall device structure while maintaining the ability to secure both cowls independently.
3Reliability
If the second handle blocks the first handle in closed configuration to ensure proper assembly sequence, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent uses the geometric relationship between the two handles as an intermediary blocking mechanism. When the second handle is in its closed position, its physical structure naturally blocks the first handle from opening, ensuring proper assembly sequence without requiring additional complex locking mechanisms or control systems.
Data Source
AI summary
A latch (22) includes a bracket (54) able to be attached to a first cowl; a hooking arm (58) comprising a hook (94) able to cooperate with a keeper (36) attached to a second cowl; a first handle (60) and a second handle (64) rotatable relative to the bracket, the first and second handles being configured so that the second handle (64) in a closed configuration blocks the first handle (60) in a closed configuration. In the closed configuration of the second handle (64), a shape of the second handle is fitted in a counter-shape (106) of the first handle (60) so as to block the first handle (60) in the closed configuration.