Folding Chair Backrest Tilt Structure for Lean-Back Comfort
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Solution Overview
Problem
Conventional folding chairs lack adjustable backrest elevation, resulting in an uncomfortable sitting posture since the backrest is fixed perpendicular to the seat, preventing users from leaning backward for better comfort.
Innovation Solution
A folding chair design featuring a seat frame with four supporting rods and crossed bearing rods, where the backrest rod tilts backward by adjusting the pivot base's position, creating an elevation angle between the backrest and seat, allowing users to lean backward for improved comfort without compromising the chair's folding capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest is fixed perpendicular to the seat, then the chair structure is simple and stable, but the sitting comfort is poor as users cannot lean backward
Solution Approach 1:
The backrest rod is designed to be tiltable relative to the seat, transforming from a fixed perpendicular structure to a dynamic adjustable structure. The pivot base allows the backrest rod to rotate and form different elevation angles with the seat, enabling users to lean backward for comfort while maintaining structural simplicity through the use of a simple rotational joint.
2Ease of operation
If the backrest rod tilts backward to form an elevation angle, then sitting comfort is improved, but the folding mechanism complexity increases
Solution Approach 1:
The tilting function and folding function are merged into a single integrated mechanism. The pivot base serves dual purposes: it allows the backrest rod to tilt backward for comfort during use, and simultaneously enables the entire seat frame to fold compactly when not in use. This combination eliminates the need for separate mechanisms for tilting and folding, maintaining simplicity while achieving both comfort and portability.
3Adaptability or versatility
If the pivot base slides on the supporting rods, then the backrest elevation angle is adjustable, but the manufacturing precision requirements increase
Solution Approach 1:
The design allows the pivot base to slide along the supporting rods, changing its position to adjust the backrest elevation angle. Instead of requiring precise pre-manufactured positioning holes or complex adjustment mechanisms, the solution uses a sliding mechanism where the pivot base can move to different positions on the rods, providing adjustable elevation angles through simple positional changes rather than precise manufacturing tolerances.
Data Source
AI summary
A folding chair includes a seat frame and a chair cloth connected to the seat frame. The seat frame includes a plurality of supporting rods including two front rods and two backrest rods, and a plurality of crossed bearing rods. Two crossed bearing rods arranged between each two adjacent supporting rods to form a plurality of facades. The lower end of each crossed bearing rod is pivotally connected to a base disposed on one of the two adjacent supporting rods and the upper end is pivotally connected to a pivot base disposed on the other of the two adjacent supporting rods. The pivot base is slidable along the other of the two adjacent supporting rods to provide support and positioning. A distance between two adjacent bases is less than a distance between two adjacent pivot bases such that the backrest rods are able to tilt backward.