Aircraft Nacelle Locking Device Sequencing Mechanism
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Solution Overview
Problem
Conventional locking devices for aircraft nacelles require precise adjustment and are prone to handling errors, with the risk of accidental opening or damage due to uneven force distribution and lack of visibility, leading to complexity, weight, and size issues.
Innovation Solution
A locking device with a first locking system and a second locking system connected by sequencing means, where the second system is actuated before the first when opening or closing, ensuring simultaneous locking/unlocking and compensating for adjustment tolerances through a cam and follower mechanism, reducing the need for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate locking systems are used (one at 6 o'clock and one at 12 o'clock), then the nacelle can be securely locked, but the device complexity, weight, and size increase
Solution Approach 1:
The patent combines two separate locking systems into a single integrated locking device with one handle. The first locking system (at 6 o'clock) and second locking system (at 12 o'clock) are mechanically linked through connecting means, allowing a single operator action to control both locking points simultaneously, thus reducing device complexity while maintaining security
Solution Approach 2:
The locking device is segmented into two independent locking systems (first and second locking systems) that can be controlled separately or simultaneously. This segmentation allows each locking point to be optimized for its specific location and function while being part of an integrated whole, resolving the contradiction between security and complexity
2Reliability
If the operator must actuate two separate handles to lock/unlock the nacelle, then both locking points can be controlled, but handling errors increase and operation becomes tedious
Solution Approach 1:
The patent merges the control of two locking systems into a single handle mechanism. The connecting means transmit the operator's single action to both locking systems sequentially, eliminating the need to operate two separate handles and reducing handling errors while maintaining reliable control over both locking points
3Productivity
If the second locking system is actuated simultaneously with the first, then the operation is faster, but adjustment tolerances cannot be compensated and damage risk increases
Solution Approach 1:
The patent implements preliminary action through sequencing means that activate the second locking system before the first locking system during the unlocking process. This sequential activation ensures that the upper locking point (second system) is released first, preventing sudden force imbalances that could cause damage, while still maintaining efficient overall operation
Solution Approach 2:
The locking and unlocking process is divided into periodic stages through the sequencing mechanism. The connecting means and sequencing means create distinct phases of activation where the second locking system is actuated first, followed by the first locking system, allowing controlled force distribution and tolerance compensation while maintaining operational efficiency
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 solution simplifies operation, ensures safe and simultaneous actuation of both locking systems, reduces the risk of damage, and lowers manufacturing and maintenance costs by eliminating the need for precise adjustment of connecting means.
Implementation Method 1
the sequencing means comprising a cam (30) comprising a track (32) cooperating with a follower element (36) moving along the latter
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a locking device (5, 6) comprising a first locking system (7) equipped with a control handle (12), intended to be actuated by an operator, characterized in that it includes a second locking system (8) connected to the first (7) by linking means (9) designed to actuate the second locking system (8) because of the actuation of the first (7), the first locking system (7) being actuated alternately between a locked state and an unlocked state by movement of the handle (12) over the totality of a defined course, the linking means (9) having sequencing means designed to actuate the second locking system (8), between a locked state and an unlocked state thereof respectively, during the displacement of the handle (12) over only part of the travel of the latter.