Galley Trolley Bay Door Latch Indicator System
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Solution Overview
Problem
Conventional trolley stowage systems in aircraft galleys lack a simple and economical method to indicate the latched or unlatched state of retainers, which is crucial for ensuring the secure storage of carts and trolleys during aircraft movements, posing safety risks due to potential uncontrolled movement.
Innovation Solution
A system incorporating a door with a latch indicator window and an indicator assembly that contacts a turnbutton to visually indicate its latched or unlatched state through a flag assembly, using a wedge mechanism and spring bias for reliable indication, even in case of malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional trolley stowage system is used without an indicator mechanism, then the device complexity is reduced, but the reliability of indicating the retainer state deteriorates
Solution Approach 1:
The indicator assembly automatically indicates the retainer state through self-service mechanisms. The flag assembly is directly actuated by the retainer position itself, eliminating the need for separate sensing or actuation systems. The spring-loaded design ensures automatic engagement and disengagement based on retainer position, providing reliable indication without complex control systems.
Solution Approach 2:
The flag assembly serves as an intermediary element that translates the retainer's position into a visible indication. Rather than directly observing the retainer position, the system uses the flag as a mediator that moves in response to retainer position and presents this information through the indicator window, simplifying the indication mechanism while maintaining reliability.
2Ease of manufacture
If a simple indicator mechanism is used, then the ease of manufacture is improved, but the reliability of the indication deteriorates
Solution Approach 1:
The indication function is extracted from the retainer mechanism itself and implemented as a separate, simple indicator assembly. This allows the indicator to be manufactured independently using simple components (flag, spring, window) while maintaining reliable connection to the retainer position through direct mechanical coupling, achieving both ease of manufacture and reliability.
Solution Approach 2:
The indicator assembly uses simple, inexpensive components that can be easily manufactured and replaced if needed. The flag assembly, spring, and window constitute a low-cost mechanism that provides reliable indication without requiring precision manufacturing or expensive materials, aligning with the principle of using simple, economical components.
3Measurement precision
If the indicator assembly is positioned deep within the trolley stowage system, then the accuracy of indicating the deep retainer state is improved, but the ease of operation deteriorates
Solution Approach 1:
The indicator system solves the observation problem by using the door as a viewing surface. The indicator window is positioned on the door, bringing the indication to the user's dimension (easy to see when door is closed), while the flag assembly remains in the deep position to accurately indicate the deep retainer state. This dimensional separation resolves the contradiction between accurate indication and ease of observation.
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
Provides a clear and reliable visual indication of the retainer state, enhancing safety by ensuring secure storage of trolleys and carts during aircraft movements, reducing the risk of injury or damage.
Implementation Method 1
a spring configured to bias the indicator assembly toward the turnbutton
Implementation Method 2
a wedge coupled to the flag assembly configured to contact the turnbutton when the turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated
Data Source
AI summary
A latch indicator system for a trolley bay is disclosed. The system includes a door that includes a latch indicator window. The system further includes an indicator assembly coupled to the door configured to contact a turnbutton then the door is closed and indicate a latched state or an unlatched state of the turnbutton. The indicator assembly includes a latch signal configured to be visible through the latch indicator window when the turnbutton is in the latched state. The indicator assembly further includes an unlatch signal configured to be visible through the latch indicator window when the turnbutton is in the unlatched state. The system further includes a wedge coupled to the flag assembly configured to contact the turnbutton when the turnbutton is in the unlatched state, where upon contact, the flag assembly is translated so that the unlatch signal is visible through the latch indicator window.