Air Passenger Seat Frame with Elevated Rear Rail
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Solution Overview
Problem
Existing aircraft passenger seats lack sufficient 'living space' between seats, particularly in long-haul aircraft, due to the conventional design where the rear rail is often level with or lower than the front rail, restricting legroom for passengers seated behind.
Innovation Solution
The design features a frame with a higher rear rail, positioned at least 20 mm above the front rail, and a smaller diameter rear spar, allowing for increased legroom by reducing the space occupied by the rear rail, and using different materials and cross-sections for the spars to enhance this configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rear rail is positioned at the same level or lower than the front rail in conventional designs, then the structural simplicity is maintained, but the living space and legroom for passengers seated behind are restricted
Solution Approach 1:
The patent applies asymmetry by positioning the rear rail at a different height than the front rail, specifically at least 20 mm higher. This asymmetric configuration optimizes the living space for passengers seated behind without requiring complex structural modifications, as the height difference is achieved through straightforward dimensional specification of the frame components.
Solution Approach 2:
The patent changes the vertical position parameter of the rear rail from being level with or lower than the front rail to being at least 20 mm higher. This parameter change directly increases the living space volume while maintaining structural simplicity through clear dimensional definitions in the frame design.
2Ease of manufacture
If the rear spar has the same diameter as the front spar, then the manufacturing process is simplified, but the space occupied by the rear rail increases, reducing legroom for passengers behind
Solution Approach 1:
The patent applies local quality by specifying that the rear spar has a smaller diameter than the front spar. This local differentiation allows the rear spar to occupy less space, thereby increasing legroom for passengers seated behind, while the front spar maintains its larger diameter for structural requirements. The manufacturing process remains relatively simple as this is achieved through straightforward dimensional specification.
3Volume of moving object
If the rear rail is positioned higher than the front rail by at least 20 mm, then the living space and legroom are increased, but the structural configuration becomes more complex
Solution Approach 1:
The asymmetric positioning of the rear rail at least 20 mm higher than the front rail creates additional living space volume. The structural complexity is managed through clear dimensional specifications and straightforward implementation in the frame design, avoiding the need for complex mechanical systems or additional components.
Data Source
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AI summary
The invention proposes an air passenger seat (1) comprising a frame that is designed to be fastened to a floor in an air passenger cabin, said frame comprising a seat divider (12), (13), (14), (15), and rails (4), (5) running transversely to the seat direction (6), wherein: the seat divider (12), (13), (14), (15) is held in place by the rails (4), (5) and is disposed behind a first front rail (4), which is positioned in front, with regard to the seat direction (6) of the rail (5); and wherein perpendicular to a plane (23), which is formed by points (19), (20), (21), (22) for fastening the frame to the floor of an air passenger cabin, is a height difference between the rails (4), (5) so that the rear rail (5) is positioned above the front rail (4) at least by a difference d of 20 mm.