Aircraft Seat Tilt-Shift Linkage for Passenger Comfort
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Solution Overview
Problem
Aircraft seats often fail to provide optimal passenger comfort during recline operations as the backrest and seatpan remain in fixed relative positions, limiting the ability to adjust for varying comfort preferences.
Innovation Solution
An articulable 'work-and-dine' aircraft seat with tilt-shift functionality, where the seatpan automatically shifts forward when the backrest is tilted, incorporating internal rollers and shift linkages to enhance passenger comfort, along with longitudinal and lateral translation, and 360-degree swiveling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest and seatpan remain in fixed relative positions during recline, then the structural simplicity is maintained, but the passenger comfort is reduced
Solution Approach 1:
The patent implements a dynamic relationship between the backrest and seatpan through a linkage mechanism. As the backrest reclines, the linkage automatically adjusts the seatpan position forward, creating a coordinated motion system that adapts to passenger needs while maintaining mechanical simplicity through passive mechanical coupling rather than active control systems
Solution Approach 2:
The linkage mechanism acts as an intermediary between the backrest and seatpan, translating backrest motion into seatpan displacement. This mechanical mediator enables the complex coordinated movement without requiring electronic controls or complex actuation systems, resolving the contradiction between comfort and simplicity
2Ease of operation
If the seatpan shifts forward during recline, then the passenger comfort is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The seat mechanism is divided into distinct functional segments: the backrest assembly, the seatpan assembly, and the linkage mechanism connecting them. This segmentation allows each component to be manufactured independently using standard aerospace materials and processes, then assembled together, reducing overall manufacturing complexity while enabling the comfort-enhancing forward shift function
3Adaptability or versatility
If the backrest tilts backward for relaxation, then the recline function is achieved, but the seatpan remains in fixed position reducing comfort
Solution Approach 1:
The linkage mechanism creates a dynamic coupling where backrest tilt automatically triggers seatpan forward movement. This dynamic response provides dual adjustment capability (backrest angle and seatpan position) through a single passive mechanical system, enhancing adaptability without requiring separate control mechanisms
Data Source
AI summary
An aircraft seat with tilt-shift functionality includes a backrest frame pivotably mounted to the seat frame, the backrest frame having rollers set into its upright end that translate through slots in the seat frame and lateral slots in its forward end capable of accepting sliders attached to the seatpan. When a passenger leans backward in the seat, tilting the backrest frame backward and downward, a shift linkage below the backrest frame translates the backward tilt to a forward shift of the seatpan forward to enhance the comfort of the passenger. The aircraft seat may further be capable of longitudinal and lateral translation as well as a full 360-degree swivel.