Linkage-Foldable Stroller Backrest Preventing Ground Contact

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Solution Overview

Problem

Current strollers have non-foldable backrests, which can become dirty when folded and increase structural complexity with multiple pivotal structures.

Innovation Solution

A stroller with a linkage-foldable backrest, featuring a flexible connecting member between the backrest and the stroller frame, allowing the backrest to fold synchronously with the stroller frame and prevent the backrest edge from touching the ground.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a fixed backrest is used in current strollers, then the structure is simple, but the backrest becomes dirty when the stroller frame is folded and the user experience is degraded

Engineering Contradiction:

Improvestructural simplicityVSAvoidbackrest contamination

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The backrest is transformed from a fixed structure to a dynamic foldable structure that moves synchronously with the stroller frame. The linkage mechanism enables the backrest to automatically fold and unfold with the frame, preventing the backrest edge from touching the ground during folding, thus eliminating contamination while maintaining structural integration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The backrest folding mechanism is merged with the stroller frame folding mechanism through the linkage system. Both structures are combined into a unified folding action, so that when the frame is folded, the backrest automatically folds in coordination, ensuring the backrest edge does not contact the ground.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If multiple pivotal structures are provided for backrest foldability, then the backrest can fold, but the structural complexity increases and folding becomes unsmooth

Engineering Contradiction:

Improvebackrest foldabilityVSAvoidpivotal structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The backrest is divided into multiple segments (first backrest, second backrest, third backrest) connected by linkages. This segmentation allows each part to move independently yet in coordination, enabling smooth folding action while distributing the mechanical complexity across multiple simpler connected components rather than requiring complex pivotal structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The linkage mechanism acts as an intermediary between the stroller frame and the backrest segments. It mediates the folding motion, translating the frame's folding action into coordinated backrest folding without requiring direct complex pivotal connections between the backrest and frame.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the stroller frame is folded with a fixed backrest, then the folding action is simple, but the backrest edge touches the ground causing contamination

Engineering Contradiction:

Improvefolding speedVSAvoidbackrest edge contact with ground

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12275450B2Stroller with linkage-foldable backrest

Publication Date: 2025.04.15 WONDERLAND SWITZERLAND AG

AI summary

The stroller with a linkage-foldable backrest having a stroller frame convertible between an unfolded state and a folded state is provided. The folding of the stroller frame of the provided stroller drives the backrest portion to fold, so as to prevent the edge of the end portion of the backrest portion from touching the ground. The folding operation of the backrest portion according to the present invention is simple and convenient.