Three-Wheel Stroller Frame Simultaneous Wheel Retraction Mechanism
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Solution Overview
Problem
Three-wheel stroller frames face challenges in storage and transportation due to their size, as the existing solutions for retracting wheels are complex and require multiple manual actions, making it difficult to quickly and easily retract all wheels simultaneously.
Innovation Solution
A stroller frame design featuring a control handle that allows all wheels to be retracted quickly and easily, with a mechanical mechanism that transmits force to the front and rear wheels, enabling simultaneous retraction and reduction in chassis size, allowing for easier storage and transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wheels are made large for comfort and safety, then the rolling behavior on uneven ground is improved, but the storage and transportation difficulty increases
Solution Approach 1:
The patent applies the dynamics principle by making the wheel assembly movable rather than fixed. The wheels can be rotated between a deployed position (extending vertically for rolling) and a retracted position (folded against the frame). This dynamic configuration allows the stroller to adapt its size for both optimal performance during use and compact storage when not in use, directly resolving the contradiction between large wheel benefits and storage difficulty.
2Ease of operation
If the four-wheel retraction mechanism is applied to three-wheel frames, then the wheel retraction capability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the retraction control for all three wheels into a single integrated mechanism. Instead of requiring separate controls for each wheel as in prior art, the invention uses one control element (such as a lever or button) that simultaneously actuates the retraction of the front wheel and the two rear wheels through a unified mechanical linkage system. This combining approach maintains full retraction capability while significantly reducing operational complexity.
Solution Approach 2:
The control mechanism is designed with multi-functionality, where a single control element performs the function of retracting all three wheels simultaneously. This universal control approach allows one component to manage multiple functions (front wheel retraction and rear wheel retraction), simplifying the overall system while maintaining the ability to retract all wheels with a single user action.
3Device complexity
If the wheels are retracted successively as in prior art, then the structural simplicity is maintained, but the retraction time and user effort increase
Solution Approach 1:
The patent implements preliminary action by designing a mechanical linkage system that is pre-configured to move all three wheels simultaneously when activated. The interconnected arms and linkages are arranged so that actuating a single control element automatically triggers the coordinated retraction of all wheels in one synchronized motion, eliminating the need for sequential manual operations and significantly reducing the time and effort required.
Data Source
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AI summary
The invention relates to a so-called three-wheel stroller frame (2) in which the front wheel (20) and the two rear wheels (22D, 22G) are respectively and simultaneously movable relative to a front arm (12) and to two rear arms (14D, 14G) rigidly connected to each other, between an extended service position, in which the rotation axes (Y20-Y20, Y22D-Y22D, Y22G-Y22G) of the wheels extend perpendicularly to a same antero-posterior plane (P) of the frame, and a stowed storage position in which said rotation axes extend in parallel to said plane, the antero-posterior distance (?) between the rear wheels and the front wheel being then smaller than when the wheels are in the expanded position. In order to move the wheels in a quick, simple and easy manner, the stroller frame also includes a specific handle (60) for manually driving a wheel movement means arranged at the front end of the front arm.