Mini-Stroller Gear Linkage for Stable Folding and Deployment
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Solution Overview
Problem
Existing strollers, particularly mini-strollers, lack an efficient mechanism for quick and stable deployment and collapse between operational and collapsed positions, often relying on hinge arrangements that can swing open unintentionally.
Innovation Solution
A gear mechanism with a 1.5:1 gear ratio is employed, utilizing linkages and a locking mechanism to facilitate rapid and controlled transitions between open and closed positions, ensuring the stroller remains stable in the collapsed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hinge arrangements are used for stroller deployment and collapse, then the structure is simple, but the stroller can swing open unintentionally and lacks stability
Solution Approach 1:
The patent replaces the traditional hinge arrangement with a gear mechanism that uses meshing gears (first gear and second gear) to control the deployment and collapse of the stroller frame. The gear mechanism provides controlled motion transmission through tooth engagement, eliminating the swinging issue while maintaining structural simplicity. The locking mechanism further enhances stability by securing the frame in the deployed position.
2Ease of operation
If quick deployment and collapse mechanism is implemented, then user convenience is improved, but the mechanism becomes more complex
Solution Approach 1:
The gear mechanism is designed to be self-actuating through user input on the handlebar. When the user applies force to the handlebar, the first gear and second gear automatically engage and transmit the motion through the linkage system, causing the frame to deploy or collapse quickly without requiring additional actuators or complex control systems. The locking mechanism automatically locks when the frame reaches the deployed position.
Solution Approach 2:
The patent employs curved linkages (first linkage and second linkage with curved paths) that guide the motion of the frame during deployment and collapse. The curved geometry of the linkages and gears enables smooth, controlled motion while maintaining compact dimensions, allowing quick transformation without requiring excessive force or complex actuation mechanisms.
3Productivity
If gear mechanism with 1.5:1 gear ratio is used, then controlled and rapid transitions are achieved, but the device complexity increases
Solution Approach 1:
The patent specifies a 1.5:1 gear ratio between the first gear and second gear, which is optimized to provide rapid and controlled transitions. This specific gear ratio ensures that the frame deploys and collapses quickly while maintaining stability, achieving the desired productivity without requiring overly complex mechanisms. The gear ratio is carefully selected to balance speed and control.
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 gear mechanism enables quick and stable deployment and collapse of the stroller, preventing unintended opening and enhancing user convenience.
Implementation Method 1
A gear mechanism with a 1.5:1 gear ratio is employed, utilizing linkages and a locking mechanism to facilitate rapid and controlled transitions between open and closed positions
Data Source
AI summary
A stroller includes a frame having a front wheel frame, a back wheel frame, and a handlebar frame, a first linkage coupled to the back wheel frame and the handlebar frame, and a second linkage coupled to the back wheel frame and the front wheel frame. The first linkage and the second linkage are configured to enable movement of the frame between an open, operational position and a closed, collapsed position. The stroller further includes a gear mechanism coupled to the first linkage and the second linkage. The gear mechanism includes a first gear coupled to the first linkage and a second gear coupled to the second linkage. The first gear and the second gear rotate relative to one another.