Aircraft Lavatory Door Unit with Non-Contact Sensor Release
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Solution Overview
Problem
Lavatory facilities on aircraft pose a risk of bacterial and viral contamination, as users may leave with pathogens on their hands despite disinfection measures, due to the need to touch potentially contaminated surfaces to open the door.
Innovation Solution
A door unit with a locking and release mechanism that includes a non-contacting sensor device, allowing users to open the door without direct contact, using hand or other body movements, and featuring a two-stage holding system to visually indicate the door's status and prevent unintended opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional door handle or contact-based opening mechanism is used, then the door can be opened easily, but users may pick up pathogens from contaminated surfaces
Solution Approach 1:
The patent replaces the mechanical contact-based door opening system with a sensor-based detection system. The sensor device detects hand movements or gestures without physical contact, triggering the door opening mechanism electronically rather than through direct mechanical interaction, thereby eliminating pathogen transmission risk while maintaining ease of operation
Solution Approach 2:
The patent introduces a sensor device as an intermediary between the user and the door opening mechanism. This intermediary detects user intent through non-contact means (such as gesture recognition or proximity sensing) and activates the door release mechanism, serving as a mediator that eliminates direct contact with potentially contaminated surfaces
2Object-affected harmful factors
If a non-contacting sensor device is used to open the door, then hygiene is improved, but device complexity increases
Solution Approach 1:
The sensor device is integrated into the existing door unit structure, serving multiple functions: it acts as both a hygiene protection mechanism and a user interface element. The sensor system is designed to work within the existing locking and release mechanism framework, adding non-contact capability without requiring a completely separate system, thereby limiting the increase in overall device complexity
3Loss of information
If the door is held in a two-stage manner, then visual indication and security are improved, but the mechanism complexity increases
Solution Approach 1:
The door holding mechanism is segmented into two distinct stages: a first holding position (fully closed/locked) and a second holding position (partially open/indicated). This segmentation provides clear visual status indication to users while maintaining security control. The segmented approach allows the mechanism to communicate its state through position rather than requiring additional indicators, thereby limiting complexity increase while improving information transmission
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
Enhances hygiene by allowing users to open the door without touching potentially contaminated surfaces, providing a visual cue for others and ensuring the door remains secure until intentionally opened, thus reducing the risk of pathogen transmission.
Implementation Method 1
the release device comprises a non-contacting sensor device that can be activated with a movement of the hand
Data Source
AI summary
A door unit for a lavatory facility on board an aircraft comprises a door element, a door frame, and a locking and release mechanism. By an articulated device the door element is held on the door frame so as to be movable between an open position and a closed position. The locking and release mechanism comprises a locking device and a release device. Further, by the locking device the door element can be locked in a closed position (PVER) in the door frame so that any opening of the door element from outside the lavatory facility is blocked. By the release device the locking device can be released. For releasing the locking device, the release device comprises a non-contacting sensor device that can be activated with a movement of the hand.