Aircraft Lavatory Door Extension for PRM Access Space
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Solution Overview
Problem
Aircraft lavatories are too small for passengers with reduced mobility, and existing solutions do not adequately address the need for larger spaces without significant structural changes.
Innovation Solution
A lavatory door with a movable extension segment that can be temporarily fixed in a stored or extended position to create additional space, combined with a partition wall that can be moved between separating and stored positions to combine two lavatories into one enlarged space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lavatory size is reduced to maximize passenger seating space, then space economy is improved, but accessibility for passengers with reduced mobility deteriorates
Solution Approach 1:
The lavatory door is designed with a movable extension segment that can dynamically change position between a retracted state (for normal use) and an extended state (for PRM access). This dynamic adjustment allows the same physical structure to adapt to different usage scenarios, providing additional space when needed while maintaining compact dimensions during standard operation.
Solution Approach 2:
The door assembly is segmented into a main door panel and a separate extension segment that can move independently. This segmentation allows the extension segment to be deployed only when required for PRM access, rather than permanently increasing the lavatory footprint. The segmented design enables flexible spatial configuration without permanent structural modification.
2Adaptability or versatility
If a movable partition is used to combine two lavatories for PRM access, then accessibility is improved, but device complexity increases
Solution Approach 1:
Instead of making the entire partition wall movable, only the necessary portion (the extension segment) is extracted and made movable. The main door panel remains stationary and simple, while only the extension segment requiring movement is equipped with the hinge arrangement and locking mechanism. This selective extraction reduces overall system complexity compared to making the entire partition movable.
Solution Approach 2:
The extension segment acts as an intermediary element between the fixed door panel and the required additional space. It provides the necessary movement and space adjustment function without requiring the entire door assembly or partition wall to be complex and movable. The intermediary segment simplifies the overall design by localizing the complexity only where needed.
3Adaptability or versatility
If the door panel is opened fully to provide access space, then accessibility is improved, but enclosure of lavatory space deteriorates
Solution Approach 1:
The extension segment is designed to be movable between positions, allowing dynamic adjustment of the door's effective opening. When extended, it provides additional access space while maintaining enclosure; when retracted, it maintains a closed appearance. This dynamic capability resolves the contradiction between providing access space and maintaining space enclosure by allowing the door to adapt its configuration based on usage needs.
Data Source
AI summary
An aircraft cabin lavatory with increased available space has a lavatory door including a door panel and an extension arrangement with at least one vertical extension segment. The door panel includes a hinge arrangement on one lateral side such that the door panel is movable around a main vertical axis between closed and opened positions. The vertical extension segment is movably mounted relative to the door panel around a subordinate vertical axis to be movable between stored and extended positions. The vertical extension segment is configured to be temporarily fixed in the stored position for a first use of the door panel. For a second use, the vertical extension segment is movable to the extended position when the door panel is in a partly opened position such that a vertically running gap between the door panel and a door frame is covered by the vertical extension segment.