Lightweight folding chair
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Solution Overview
Problem
Current folding chairs are not compact enough for easy carrying, have unstable leg structures due to large leg tube angles and soft plastic connections, leading to poor rigidity and user experience.
Innovation Solution
A lightweight folding chair design featuring a bottom bracket assembly with pluggable and rotatable connections using elastic cords and rivets, allowing for compact folding and improved stability through a specific arrangement of horizontal tubes and leg tubes, ensuring a smaller folded volume and enhanced load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the folding chair uses linkage mechanism for folding, then it can be folded into sheet or bundle shape, but the folding is not compact enough and the volume is too large
Solution Approach 1:
The chair frame is divided into multiple independent horizontal tubes (front horizontal tube, rear horizontal tube, left horizontal tube, right horizontal tube) that can be separately folded and positioned. Each tube connects to connectors through pluggable or rotatable joints, allowing independent movement and compact arrangement during folding, significantly reducing the overall folded volume compared to traditional linkage mechanisms.
2Shape
If the leg tube angle is increased, then the chair structure changes, but the stress becomes unstable and rigidity is poor
Solution Approach 1:
The leg tube angle is optimized to a specific range (45-60 degrees) to achieve the best balance between structural compactness and stress stability. This parameter optimization ensures that the leg tubes can bear vertical loads effectively while maintaining overall chair stability, preventing excessive shaking and improving rigidity.
3Ease of manufacture
If plastic parts are used to connect main stressed members, then assembly is simplified, but the connection is relatively soft and the chair seat shakes too much
Solution Approach 1:
The connectors are made from composite materials that combine the ease of plastic injection molding with the strength and rigidity of metal reinforcement. This composite approach allows for simple assembly processes while providing rigid connections that prevent excessive shaking and improve overall chair stability.
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 chair achieves a compact fold, improved stability, and convenience in carrying by reducing the volume occupied, while maintaining high load-bearing capabilities and enhancing user experience through efficient component alignment and material usage.
Implementation Method 1
one end of the rear horizontal tube is in pluggable connected to the left rear connector through an elastic cord
Implementation Method 2
the other end thereof is rotatably connected to the right rear connector through rivets
Data Source
AI summary
The invention discloses a lightweight folding chair, comprising a chair seat and a bottom bracket assembly; the assembly comprises a frame member in the middle that comprises left rear, right rear, left front, and right front connectors, and rear, left, front, and right horizontal tubes that sequentially connect the left rear, right rear, left front, and right front connectors together; a backrest tube is connected to each upper end of the left rear and right rear connectors through the elastic cord; an upper support tube is connected to each upper end of the left front and right front connectors through the elastic cord. The angle of the leg tube is small and the stress is good during use; after the invention is folded, the components are brought close together, the folded volume is smaller, which does not occupy much space and is more convenient to be carried and transported.