Variable-geometry bicycle frame with articulated joints
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Solution Overview
Problem
Current bicycle frame technologies are limited in their ability to dynamically adjust geometry and suspension parameters during riding, particularly for off-road bikes, often compromising on weight, stiffness, or requiring complex control systems for limited adjustments.
Innovation Solution
A bicycle frame design featuring a shock-absorbing lever mechanism with articulated joints connecting the front fork, crankset, seat constructional part, and rear wheel suspension, allowing for intuitive and complete adjustments of saddle height, rear suspension stroke, and other parameters through a movable adjusting assembly operated via a handlebar shifter, maintaining rigidity and lightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable telescopic seatposts are used to change saddle height, then saddle height is adjustable, but the adjustment range is limited and the mechanism adds weight and complexity
Solution Approach 1:
The patent implements a dynamic suspension system where the seat post is integrated with a shock absorber mechanism that allows continuous adjustment of saddle height and suspension stroke. The system transitions from static adjustable seatposts to a dynamic system where the saddle height and suspension parameters can be adjusted together through a single mechanism, eliminating the need for separate adjustment mechanisms and reducing overall complexity.
Solution Approach 2:
The shock absorber mechanism serves multiple functions simultaneously: it acts as both the suspension system and the seat height adjustment mechanism. By integrating these two functions into a single system, the patent eliminates the need for separate adjustable seatpost mechanisms, thereby reducing device complexity while maintaining adjustability.
2Adaptability or versatility
If suspension parameters are adjusted mid-ride, then adaptability to terrain is improved, but the mechanism adds weight and reduces frame stiffness
Solution Approach 1:
The patent implements a dynamic suspension system where the seat post is integrated with a shock absorber mechanism that allows continuous adjustment of saddle height and suspension stroke. The system transitions from static adjustable seatposts to a dynamic system where the saddle height and suspension parameters can be adjusted together through a single mechanism, eliminating the need for separate adjustment mechanisms and reducing overall complexity.
3Manufacturing precision
If complex control systems are used for geometry adjustments, then adjustment precision is improved, but the system becomes heavier and more expensive
Solution Approach 1:
The patent implements a self-adjusting mechanism where the rider's body weight and movement automatically adjust the suspension parameters and saddle height. The system uses the rider's own movements to trigger adjustments through body-weight sensing mechanisms, eliminating the need for complex electronic control systems, motors, or sensors while maintaining precise geometry adjustment.
Data Source
AI summary
The invention relates to a variable-geometry bicycle frame. The bicycle frame consisting of a bearing element (1) comprises a front fork mount (2) and a crankset mount (3), a seat constructional part (10) comprises a saddle’s (4) clamp, an adjustment part (7), a rear wheel suspension set (20) comprises a swingarm (21) and a shock absorber (22) characterized in that, the bearing element (1) is connected by at least one articulated joint to the seat constructional part (10) and by at least one articulated joint to the rear wheel suspension set (20), and the seat constructional part (10) is connected by at least one articulated joint to the rear wheel suspension set (20) and the adjustment part (7) is movable within the range from the X position to Y position.