S-Frame Folding Chair Structure for Stability on Soft Ground
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Solution Overview
Problem
Existing folding chairs and armchairs lack a stable support structure on soft surfaces like grass or sand due to a four-point bearing surface, and there is no known design that effectively joints the seat, vertical front legs, and base set on the ground in an S-frame configuration.
Innovation Solution
A folding chair with S-frame armrests articulated by transverse axes, featuring two vertical front legs joining the seat with a horizontal base and two joining bars that articulate with the seat and base, along with an attachment mechanism using a U-shaped rod and rail system for stability and hanging functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a four-point bearing surface is used in X-frame folding chairs, then the structure is simple and easy to manufacture, but the stability on soft surfaces like grass or sand deteriorates
Solution Approach 1:
The base is divided into multiple contact points through the S-frame configuration with horizontal bars, transforming a single four-point contact into a distributed multi-point contact system that improves stability on soft surfaces while maintaining manufacturing simplicity
Solution Approach 2:
The chair structure transitions from a traditional X-frame to an S-frame configuration that extends the base in multiple dimensions, creating a wider footprint with horizontal bars that increase contact area with the ground without complicating the manufacturing process
2Stability of the object's composition
If the seat, vertical front legs, and base are jointed in an S-frame configuration, then the stability and structural strength are improved, but the device complexity increases
Solution Approach 1:
The S-frame configuration merges the seat, vertical front legs, and horizontal base into a continuous integrated structure, eliminating the need for separate complex jointing mechanisms while inherently providing stability and structural strength through the unified design
Solution Approach 2:
The S-frame structure serves multiple functions simultaneously: it provides structural strength, ensures stability on various surfaces, and enables the folding mechanism, replacing the need for separate components for each function and thereby reducing overall device complexity
3Stability of the object's composition
If horizontal bars are set on the ground parallel to armrests in S-frame chairs, then the lengthwise stability is improved, but the transversal resistance is reduced compared to perpendicular bars
Solution Approach 1:
The S-frame configuration employs asymmetric bar orientations where horizontal bars run parallel to armrests for lengthwise stability, while the curved S-shape itself provides transversal resistance, creating a balanced structural system that addresses both directional stability requirements through asymmetric geometry
Data Source
AI summary
Folding chair with armrests, type S, articulated by transversal axes to the armrests. It has a seat; a back; a horizontal base that is set on the ground; two front legs that join the front part of said seat with the horizontal base that is set to the ground; an attachment mechanism in the application position; two joining bars that articulate the armrests with the middle part of the seat and with the horizontal base that is set to the ground.