Pivotable Seat Track Fitting Reduces Preload Transfer
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Solution Overview
Problem
Conventional passenger seat track fitting assemblies transfer excessive preload to the seat leg when the seat is rolled, due to the mismatched axes of rotation between the base frame and the track, leading to potential seat rattle and displacement.
Innovation Solution
A pivotable stud track fitting assembly with a base frame and pivotable inserts that align the axis of rotation closer to the track, utilizing a plunger and spring mechanism to minimize bending moments and secure the seat, featuring modular design for material optimization and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed studs with flared ends are used to create a snug fit between the track and base frame, then seat rattle and unintended displacement are prevented, but excessive preload is transferred to the seat leg when the seat is rolled
Solution Approach 1:
The patent replaces fixed studs with a pivotable insert mechanism that allows dynamic adjustment. The insert can rotate about a pivot axis, enabling the connection point to move and align with the track's axis of rotation during rolling operations, thereby reducing preload transfer while maintaining secure attachment
Solution Approach 2:
The invention changes the geometric parameter of the connection axis by positioning the pivot axis of the insert closer to the track's axis of rotation. This parameter change reduces the moment arm and consequently the bending moments and preload transferred to the seat leg during rolling
2Device complexity
If the axis of rotation of the base frame is not close to the axis of rotation of the track, then the structure is simpler, but bending moments are increased when the seat track is rolled
Solution Approach 1:
The base frame is segmented into separate components: a base frame body and a pivotable insert. This segmentation allows the insert to be positioned with its pivot axis close to the track's axis of rotation, reducing bending moments, while the overall base frame structure remains relatively simple
Solution Approach 2:
The pivotable insert acts as an intermediary element between the base frame and the track. It mediates the connection by providing a pivot axis that aligns closely with the track's axis of rotation, thereby reducing bending moments without requiring complex modifications to the base frame structure
3Ease of manufacture
If conventional track fitting assemblies are used, then installation is straightforward, but the axis of rotation mismatch causes considerable preload transfer to the seat leg
Solution Approach 1:
The pivotable insert mechanism maintains ease of installation through a straightforward engagement process while dynamically adjusting the connection point during operation. The insert can be easily positioned and locked into place, and its pivotability automatically aligns the axis of rotation during rolling, reducing preload transfer without complicating installation
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
The solution effectively reduces preload transfer, minimizes seat rattle, and allows for precise alignment, enhancing the stability and durability of the passenger seat by aligning the axis of rotation and using a modular design for material efficiency and maintenance.
Implementation Method 1
at least one plunger (16) configured to move the at least one pivotable insert (14) between a locked position and an unlocked position
Data Source
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AI summary
Track fitting assemby having a base frame (12) comprising a pivot shaft (44) arranged so that the pivot shaft substantially aligns with an upper surface of a track when the base frame is coupled to the track and at least one pivotable insert (14) pivotally coupled to the pivot shaft.