Foldable chair

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Solution Overview

Problem

Existing foldable chairs lack sufficient overall load capacity and stability, and their storage volume reduction is not significant enough to accommodate multiple chairs in a limited space, causing inconvenience during transport and storage.

Innovation Solution

A foldable chair design featuring reinforced structures, including honeycomb-patterned reinforcing lattices, reinforcing rings, and anti-slip pads, which enhance the chair's stability and allow it to fold flat for compact storage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If foldable chairs are designed with simple plate combinations for portability, then ease of transport is improved, but load-bearing capacity and structural stability deteriorate

Engineering Contradiction:

Improveease of transportVSAvoidload-bearing capacity

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent applies composite material principles by combining multiple plate components (seat plate, back plate, connecting plates) with reinforcement structures (ribs, gussets, stiffening elements) to create a composite framework that maintains both portability and enhanced load-bearing capacity. The reinforcement structures are integrated into the plate combinations to strengthen the overall assembly without significantly increasing weight.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The chair structure is segmented into multiple pivotally connected plates including seat plate, back plate, and connecting plates that can fold relative to each other. This segmentation enables the chair to be disassembled into compact segments for easy transport while the distributed reinforcement structures across different segments maintain overall structural integrity and load-bearing capacity when assembled.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If foldable chairs use simple plate combinations, then device complexity is reduced, but structural stability and load capacity worsen

Engineering Contradiction:

Improvestructural simplicityVSAvoidstructural stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Reinforcement structures such as ribs, gussets, and stiffening elements are pre-integrated into the plate components during manufacturing. These preliminary reinforcement actions ensure that when the chair is assembled from simple pivotally connected plates, the structural stability and load-bearing capacity are already optimized, eliminating the need for complex additional bracing or support mechanisms.

Inventive Principle:

Principle #10Preliminary action

3Strength

If chairs are designed with fixed structures for stability, then load-bearing capacity is improved, but storage volume reduction capability deteriorates

Engineering Contradiction:

Improveload-bearing capacityVSAvoidstorage volume

Core Design Contradiction:

StrengthVSVolume of moving object

Solution Approach 1:

The chair employs dynamic pivot connections between plates that allow the structure to transition between a stable, load-bearing assembled state and a compact folded state for storage. The reinforcement structures are designed to maintain structural integrity during this dynamic transformation, enabling the chair to provide stable support during use while reducing to a compact form for space-efficient storage.

Inventive Principle:

Principle #15Dynamics

4Strength

If reinforcement structures are added to foldable chairs, then load-bearing capacity is improved, but device complexity increases

Engineering Contradiction:

Improveload-bearing capacityVSAvoidstructural complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

Reinforcement structures such as ribs, gussets, and stiffening elements are merged directly into the plate components themselves during manufacturing, rather than being added as separate assembled parts. This integration approach strengthens the load-bearing capacity of the chair while avoiding additional complexity in assembly and disassembly procedures, maintaining the simplicity of the foldable mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4364614B1Foldable chair

Publication Date: 2026.02.04 JING SI PURELAND CO LTD

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AI summary

A foldable chair is provided. The foldable chair includes two supporting side frames, two connecting plates, a seat plate and a back plate. The two supporting side frames are each formed with a first supporting part and a second supporting part. The two connecting plates are arranged between the two supporting side frames and are pivotally connected to the two supporting side frames. The seat plate is arranged between the first supporting parts of the two supporting side frames, and both sides of the seat plate are pivotally connected to the first supporting parts of the two supporting side frames. An inner side of at least one of the two supporting side frames, the two connecting plates, the seat plate, or the back plate is formed with a reinforcement structure.