Seat Unit Linkage for Zero-Gravity Recline Adjustment
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Solution Overview
Problem
Existing functional seat adjustments are limited, making it difficult to achieve a zero-gravity state, which results in low comfort, especially in stretching and lying positions.
Innovation Solution
An adjusting device for a seat unit that cooperatively adjusts the height and angle of the backrest, seat, and footrest parts, allowing users to achieve a zero-gravity state by transitioning between sitting, stretching, and lying positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seat unit uses a conventional adjusting mechanism, then the structure is simple, but the adjustment angle is small and zero gravity state cannot be achieved
Solution Approach 1:
The patent employs a dynamic adjusting mechanism with multiple connecting members (first connecting member with hinge holes, second connecting member, third connecting member) that enable continuous angular adjustment. The mechanism transforms the rigid structure into a dynamic system capable of achieving various positions including zero gravity state through coordinated movement of hinged components
Solution Approach 2:
The adjusting mechanism is divided into multiple independent connecting members with specific hinge hole arrangements. The first connecting member has hinge holes at specific distances (A1, A2 with ratio ≤0.5), the second connecting member has hinge holes (B1, B2 with ratio ≤0.5), and the third connecting member has hinge holes (C1, C2 with ratio ≤0.35). This segmentation allows each component to contribute to the overall adjustment range while maintaining structural simplicity
2Ease of operation
If the seat unit achieves zero gravity state through cooperative adjustment, then comfort is improved, but the adjusting mechanism complexity increases
Solution Approach 1:
The patent merges the adjustment functions of the backrest, seat, and footrest into a single coordinated mechanism. The first connecting member connects to the backrest, the second connecting member connects to the seat, and the third connecting member connects to the footrest. All three components adjust simultaneously through one driving force, achieving zero gravity state while avoiding the need for three separate adjusting mechanisms
Solution Approach 2:
The adjusting mechanism serves multiple functions: it adjusts the backrest angle, seat angle, and footrest angle simultaneously. The connecting members with specifically positioned hinge holes provide universal adjustment capability for all three components, enabling the seat unit to achieve sitting, stretching, and zero gravity positions through a single mechanism
Data Source
AI summary
Provided is an adjusting device for a seat unit, configured to switch the seat unit between a sitting position, a stretching position, and a lying position. The adjusting device includes a backrest connecting assembly, an intermediate transmission assembly, and a footrest connecting assembly that are connected in sequence. The backrest connecting assembly at least includes a backrest connecting block. The intermediate transmission assembly at least includes a seat frame and an adjusting mechanism configured to adjust the seat frame. The adjusting mechanism includes a first connecting member, the first connecting member is configured with a first hinge hole, a second hinge hole, and a third hinge hole in sequence, a distance between the first hinge hole and the third hinge hole is A1, a distance between the second hinge hole and the third hinge hole is A2, and a ratio of A2 to A1 is not greater than 0.5.