Folding Bicycle Crank Positioning for Compact Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing folding two-wheeled bicycles often require tools, complex mechanisms, or multiple steps to fold, and they may not remain stable when folded, making them difficult to store and transport efficiently.
Innovation Solution
A folding bicycle design where the cranks and most of the seat post are positioned between the wheels in the folded state, allowing for easy folding without tools and maintaining stability, with a focus on compactness and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional folding mechanisms are used, then the bicycle can be folded, but the folding process requires tools, complex mechanisms, or multiple steps
Solution Approach 1:
The bicycle frame is divided into multiple foldable sections (head tube assembly, seat tube assembly, down tube assembly) that can be independently folded and positioned. This segmentation allows each section to be simplified and folded without requiring complex overall mechanisms or tools.
Solution Approach 2:
Instead of using complex locking mechanisms to hold the folded position, the invention uses gravity and the positioning of components (cranks and seat post between wheels) to naturally maintain the folded state. The folded position becomes the stable state through inverted design logic.
2Volume of moving object
If the bicycle is folded compactly, then storage space is reduced, but the bicycle may roll away and become unstable
Solution Approach 1:
The cranks and seat post are positioned between the wheels in the folded state, merging multiple components into the compact space between the wheels. This arrangement achieves compact folded volume while the interlocking position of these components provides inherent stability and prevents rolling.
Solution Approach 2:
The bicycle structure itself provides stability through the positioning of cranks and seat post between the wheels, without requiring external supports, stands, or additional stabilization mechanisms. The design is self-stabilizing in the folded position.
3Ease of operation
If the bicycle is designed for easy folding without tools, then ease of operation improves, but the folding mechanism may become too simple to maintain stability
Solution Approach 1:
The bicycle transitions dynamically between unfolded and folded states through simple frame section movements. The folded position is maintained through the natural interlocking of components (cranks and seat post between wheels) rather than complex static locking mechanisms, achieving both ease of operation and reliability.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A folding vehicle is adjustable between an unfolded position and a folded position. In the unfolded position, the wheels of the vehicle are in a leading and trailing relationship. In the folded position, the components of the folding vehicle have a minimal footprint allowing for compact storage. In the folded position, the wheels maybe in a side-by-side relationship with the majority of the vehicle components positioned between the wheels.