Cushion Frame Lifter Link Layout for Coordinated Deformation
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Solution Overview
Problem
Existing cushion frames with lifter functions face challenges in coordinating the deformation of lifter links with restricted and free links due to unequal reactions to external loads, leading to improper deformation coordination.
Innovation Solution
The cushion frame design includes a first lifter link with a deformation inducer and a second lifter link with a deformation inducer, where the distance from the rotation center to the deformation inducer is greater for the second link, ensuring balanced bending moments and coordinated deformation through synchronized rotation and sloping surfaces to guide deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the displacement of the restricted link is directly restricted by the lock mechanism, then the restricted link can be controlled to deform properly, but the reaction acting on the restricted link becomes larger than the reaction acting on the free link, making it difficult for both links to deform properly in cooperation
Solution Approach 1:
The patent applies asymmetry by positioning the deformation inducer at different distances from the rotation center in the two lifter links. Specifically, the deformation inducer in the free link is positioned farther from the rotation center than the deformation inducer in the restricted link. This asymmetric arrangement creates different lever arms that compensate for the unequal reaction forces, allowing both links to experience balanced bending moments and deform properly in cooperation despite the direct restriction on the restricted link by the lock mechanism
2Reliability
If deformation inducers are disposed in both lifter links, then coordinated deformation can be achieved, but the structural complexity increases
Solution Approach 1:
The patent applies local quality by introducing deformation inducers only at specific locations within the lifter links rather than throughout the entire structure. The deformation inducers are positioned at precise distances from the rotation centers based on the lever arm principle, creating localized weak points that guide deformation. This approach achieves coordinated deformation while minimizing overall structural complexity by limiting the modification to specific critical areas
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
This design allows for proper coordination of lifter link deformations, ensuring balanced reactions and controlled deformation, preventing excessive deformation and enhancing the frame's stability under external loads.
Implementation Method 1
the deformation inducer absorbs an energy generated by the load by plastically deforming before other parts of the cushion frame deform
Implementation Method 2
the second lifter link being configured to be displaced rotationally in synchronization with the first lifter link
Implementation Method 3
the coupling member being rotatable with respect to the first side frame and the second side frame
Data Source
AI summary
A cushion frame includes a first side frame; a second side frame; a coupling member; a first lifter link; a second lifter link; a lock mechanism; a first deformation inducer disposed in the first lifter link; and a second deformation inducer disposed in the second lifter link. A dimension from a rotation center of one end portion of the second lifter link to the second deformation inducer is greater than a dimension from a rotation center of one end portion of the first lifter link to the first deformation inducer.