Foldable Chair Frame Structure With Adjustable Backrest Angle
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Solution Overview
Problem
Foldable chair frames with fixed backrest pipes used as front legs restrict the elevation angle of the backrest, resulting in inadequate comfort and limited sitting posture options.
Innovation Solution
A chair frame structure with pivotally connected supporting legs, backrest rods, and cross supporting rods that form a specific elevation angle, allowing for adjustable backrest positioning and comfortable seating, while maintaining foldability for convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the backrest pipes are fixed and used as front supporting legs, then the chair frame structure is simplified and foldability is achieved, but the backrest elevation angle is fixed and sitting comfort is reduced
Solution Approach 1:
The backrest is divided into separate backrest rods that can be independently positioned relative to the supporting legs. The backrest rods are no longer integral with the front supporting legs but are connected via connecting pieces, allowing the backrest to be segmented from the leg structure. This enables independent adjustment of the backrest elevation angle while maintaining the overall foldable structure.
Solution Approach 2:
The backrest elevation angle is made adjustable through the connecting piece mechanism. The connecting piece can slide along the backrest rod and lock at different positions, transforming the fixed backrest angle into a dynamic, adjustable parameter. This allows users to customize the backrest angle according to comfort requirements while preserving the foldable nature of the chair.
2Ease of operation
If the backrest elevation angle is fixed at a certain inclination, then the chair frame structure is simplified, but the sitting comfort and resting effect are insufficient
Solution Approach 1:
A connecting piece is introduced as an intermediary element between the backrest rod and the front supporting leg. This connecting piece acts as a mediator that allows relative movement and angle adjustment while maintaining structural connection. The connecting piece includes a sliding mechanism that enables smooth adjustment of the backrest angle without requiring complex adjustment mechanisms.
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 design enables a comfortable sitting posture with a customizable elevation angle for the backrest, allowing for effective folding and unfolding of the chair frame, reducing storage volume and enhancing usability.
Implementation Method 1
a connecting piece which can slide upwards is arranged on the backrest rod
Implementation Method 2
supporting legs, backrest rods and cross supporting rods which are connected thereon
Data Source
AI summary
Disclosed are chair frames and foldable chairs. A chair frame includes left and right side frames, each having a front leg, a rear leg, a backrest rod, a seat rod, and a connecting piece. The backrest rod and the seat rod are pivotally connected to the rear leg. The front leg is pivotally connected to the connecting piece movably disposed on the rear leg. The chair frame also includes a pair of cross front supporting rods and a pair of cross rear supporting rods. Each front supporting rod is pivotally connected to the front leg of one side frame and pivotally connected to the seat rod of the other side frame. Each rear supporting rod is pivotally connected to the rear leg of one side frame and pivotally connected to the front leg of the other side frame.