Adjustable Bicycle Frame Telescopic Geometry
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Solution Overview
Problem
Conventional bicycle frames are fixed and unable to adjust for different rider heights or riding modes, leading to inadequate performance, comfort, and stability, particularly affecting high-speed and urban riding.
Innovation Solution
An adjustable bicycle frame that allows incremental adjustment of the length between the front wheel and rear wheel, and the length and inclined angles of the seat tube and head tube, enabling coherent changes to accommodate various riding modes and rider heights, featuring a telescopic tubing system with a locking device for secure adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bicycle frame uses a fixed structure, then the manufacturing simplicity is maintained, but the adaptability to different riders and riding modes deteriorates
Solution Approach 1:
The bicycle frame is divided into multiple telescopic tubes (first tube, second tube, third tube) that can independently adjust their lengths. Each tube segment can be extended or retracted to change the overall frame geometry, allowing the same frame to accommodate different rider sizes and riding modes without requiring multiple different frame designs.
Solution Approach 2:
The frame structure transitions from a static fixed configuration to a dynamic adjustable configuration. The telescopic tubes with locking devices enable the frame to change its geometry dynamically, allowing riders to adjust the frame to match their body dimensions and preferred riding style, thus resolving the contradiction between fixed structure simplicity and adaptability.
2Adaptability or versatility
If the frame length is increased for tall riders, then the comfort for tall riders is improved, but the adaptability for short riders deteriorates
Solution Approach 1:
The frame is segmented into multiple adjustable tube sections that can be independently configured. This segmentation allows the frame to be customized for each rider's height, ensuring that both tall and short riders can achieve optimal comfort by adjusting the tube lengths to match their body proportions.
Solution Approach 2:
The single frame design with telescopic tubes serves multiple functions by accommodating riders of various heights. The same frame can be configured for different body types, eliminating the need for separate frame designs for different rider categories and ensuring universal applicability across diverse rider populations.
3Adaptability or versatility
If the inclined angle of seat tube and head tube is increased for racing mode, then the pedaling efficiency is improved, but the comfort for urban riding deteriorates
Solution Approach 1:
The frame geometry becomes dynamic and adjustable rather than fixed. Riders can change the inclined angles of the seat tube and head tube by adjusting the telescopic tubes, allowing optimization for racing mode with higher angles for pedaling efficiency, or for urban mode with lower angles for comfort, making the frame adaptable to different riding preferences and conditions.
4Adaptability or versatility
If the crossbar length is increased for racing mode, then the aerodynamic position is improved, but the maneuverability for urban riding deteriorates
Solution Approach 1:
The crossbar is divided into telescopic sections that can be extended or retracted. This segmentation allows the crossbar length to be adjusted according to the riding mode: extended for racing mode to enable aerodynamic positioning, and retracted for urban mode to improve maneuverability and ease of handling in tight spaces.
Data Source
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AI summary
An adjustable bicycle frame for change in the riding modes is provided with a bottom bracket secured to pedals; a seat tube extending upward out of the bottom bracket; a chain stay extending rearward out of the bottom bracket and the seat tube; a rear wheel rotatably secured to the chain stay and contacting the ground; a head tube with a stem pivotably secured thereto; a fork pivotably secured to the head tube and extending downward; a front wheel rotatably secured to the fork stay and contacting the ground; a rearward inclined telescopic tubing including first and second tubes. After changing length of the telescopic tubing, a length between the front wheel and the rear wheel is changed, an inclined angle of the seat tube is changed, and an inclined angle of the head tube is changed coherently, thereby implementing a racing mode or a slow, urban riding mode.