Aircraft Door Retaining System with Inverted Locking Mechanism
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Solution Overview
Problem
Existing door retention systems on aircraft, such as lavatory doors, struggle to transmit higher forces effectively, often relying on manual bolts that are insufficient for securing the door in critical conditions like turbulence or landing.
Innovation Solution
A retaining system with a support structure featuring a first and second retaining area, where the door element is locked using movable locking elements integrated into the support structure, allowing for higher force transmission without weakening the door and reducing weight, with a locking receptacle on the door element and a temporarily usable seat integrated into the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If manual bolts are used for locking the door element, then the door can be locked in the closed position, but the system is unable to transmit additional higher forces
Solution Approach 1:
The patent inverts the traditional locking mechanism by placing the movable locking element on the fixed support structure rather than on the movable door element. This inversion allows the fixed structure to provide the mechanical advantage and force transmission capability, while the door element only needs to provide the locking receptacle, significantly improving force transmission without compromising reliability.
Solution Approach 2:
The locking system is segmented into two distinct functional parts: the movable locking element integrated into the support structure and the locking receptacle on the door element. This segmentation allows each component to be optimized independently - the locking element for force transmission and the receptacle for engagement - resolving the contradiction between force capability and reliability.
2Force
If the movable locking element is integrated into the support structure, then higher forces can be transmitted, but the door element weight can be reduced
Solution Approach 1:
The patent extracts the heavy mechanical locking mechanism from the door element and relocates it to the support structure. This extraction allows the door element to be significantly lighter while the support structure, which is inherently more massive and structurally integrated, bears the force transmission responsibility, thus reducing door weight without compromising force capability.
3Adaptability or versatility
If a temporarily usable seat is integrated into the door element, then space utilization is improved, but the door structure becomes more complex
Solution Approach 1:
The door element is designed with multi-functionality by integrating a temporarily usable seat into its structure. This allows the door to serve both as a closure barrier and as seating when not in use, improving space utilization. The seat is designed to be temporarily attachable and removable, maintaining the door's primary function while adding versatility without excessive complexity.
Data Source
Figure 1~2
Figure 3A
Figure 3B~3C
AI summary
The present invention relates to retaining movable components on board an aircraft. In order to be able to transmit higher forces when retaining movable components, a retaining system (10) is provided, which comprises a support structure (12) with a first retaining area (14) and a second retaining area (16), and a movable component (18), a retaining device (20) and a locking device (22). The movable component is movably attached to the first retaining area with the retaining device, and the movable component can be locked on the second retaining area with the locking device. The locking device comprises at least one movable locking element (24) and at least one locking receptacle (26). The at least one movable locking element can be moved between an open setting (SOFF) and a locked setting (SVER), wherein the at least one movable locking element engages with the locking receptacle in the locked setting, so that the movable component is temporarily immovably retained, and allows the movable component to move in the open setting. The at least one movable locking element is situated on the second retaining area, and the at least one locking receptacle is situated on the movable component.