Folding Chair Armrest Pivot Lock for Obese User Access
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Solution Overview
Problem
Conventional folding chairs are cumbersome for obese individuals due to immovable armrests and poor stability, making it difficult to seat and fold efficiently, resulting in a larger size after folding.
Innovation Solution
A folding chair frame structure with pivotally connected armrest supporting rods and engaging mechanisms that allow for adjustable armrest positioning, enhancing user accessibility and stability by securing armrests against the frame units when folded and preventing rotation when unfolded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If armrests are fixedly connected to the chair frame, then the chair frame structure is simple, but it is troublesome for a fat person to seat himself/herself due to restricted distance between armrests
Solution Approach 1:
The armrest connection structure is changed from fixed to dynamic/movable. The armrests are pivotally connected to the chair frame, allowing them to move between a raised position (when folded) and a lowered position (when unfolded), enabling easy access for seating while maintaining structural simplicity
2Stability of the object's composition
If armrests are pivotally connected to corresponding rods of the chair frame, then the chair can be folded, but the stability of the folding chair is poor when unfolded
Solution Approach 1:
The armrest connection is divided into two independent parts: the armrest rod pivotally connected to the chair frame, and the armrest support rod pivotally connected to the armrest rod. This segmentation allows the armrest support rod to be independently adjusted and locked, providing stability when unfolded while maintaining folding capability
Solution Approach 2:
The armrest support rod acts as an intermediary element between the armrest rod and the back rod. It provides additional support and stability when the chair is unfolded, preventing the armrest from rotating or moving excessively, while still allowing the chair to be folded
3Volume of moving object
If armrests are pivotally connected to corresponding rods of the chair frame, then the chair can be folded, but the armrests cannot be folded to be against the back rods, resulting in large size after folding
Solution Approach 1:
The armrest support rod is designed to be movable and adjustable. It can be rotated and positioned at different angles, allowing it to fold against the back rod when the chair is folded for compact storage, and be extended to provide support when the chair is unfolded for use
Data Source
AI summary
A folding chair frame structure includes left and right supporting frame units, front and rear connecting frame units, and a pair of armrest supporting rods. A top of each armrest supporting rod has a spherical head. Each armrest supporting rod has an engaging groove below the spherical head. A pair of armrest rods is pivotally connected to respective rear parts of the left and right supporting frame units. A front end of each armrest rod has a joint. A lower end of the joint has an accommodating chamber. A side wall of the accommodating chamber has at least one receiving opening. An engaging plate is detachably inserted in the receiving opening. The engaging plate has a through hole. When the spherical head is inserted in the accommodating chamber and passes through the through hole, the engaging plate is engaged with the engaging groove.