Bicycle Support Pad for Arm-Propelled Steering Stability
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Solution Overview
Problem
Existing arm-propelled bicycle designs with 180-degree handlebar crank orientation compromise steering stability and efficiency, causing instability and discomfort due to uneven force distribution during pedaling, and previous support solutions either interfere with steering or are impractically positioned, leading to inefficient propulsion and increased risk of injury.
Innovation Solution
A support pad mounted to the upper part of the fork steerer tube allows the rider to rest their chest and upper body, reducing wrist and hand stress and enabling stable steering by distributing weight directly along the axis of the front wheel, thus maintaining steering control and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the handlebar crank arms are oriented at 180 degrees relative to one another, then the resistance for arms is improved and the rider's body can maintain a consistent position, but the steering function of the handlebars is severely compromised and the vehicle becomes unstable
Solution Approach 1:
A support pad is introduced as an intermediary element between the rider and the bicycle frame. This pad provides a stable reference point for the rider's upper body, allowing the rider to maintain consistent positioning without relying solely on handlebar grip. The support pad absorbs some of the stabilizing function, thereby preserving handlebar steering responsiveness.
2Ease of operation
If the handlebar crank arms are oriented at 0 degrees relative to one another, then steering is made easy and the vehicle becomes very stable, but the rider experiences severe body swinging and energy waste during the pedaling stroke
Solution Approach 1:
The support pad acts as a counterbalancing element that provides resistance against the reactive forces generated during the pedaling stroke. When the rider pulls the handlebar towards their body, the support pad provides a stable reference point that prevents excessive body movement forward, thereby reducing energy waste and improving propulsion efficiency.
3Ease of operation
If a support pad is positioned forward of the fork steerer tube, then the rider receives support for the upper body, but additional unwanted steering instability occurs due to lever effect on the handlebars
Solution Approach 1:
Instead of positioning the support pad forward of the steerer tube as in conventional designs, this invention inverts the positioning by placing the pad at or behind the steerer tube location. This reversal eliminates the lever effect that causes steering instability while still providing necessary support for the rider's upper body.
4Ease of operation
If a support pad is positioned on the frame's top tube, down tube, or seat post, then the rider receives support, but these positions interfere with other desired functions such as cycling standing up and dismounting
Solution Approach 1:
The support pad is extracted from traditional mounting locations (top tube, down tube, seat post) and repositioned to the fork steerer tube area. This extraction from conventional positions eliminates interference with standing up and dismounting functions while maintaining the support function. The pad is taken out of the frame structure and positioned where it serves both support and steering stability purposes.
Data Source
AI summary
Invention relates to the type of two wheel velocipede where the propulsion to the rear wheel is achieved by the use of riders legs/feet and propulsion to the front wheel is achieved by the use of riders arms and upper body on cranks that travel in circular motion using a single chain as a means to transfer force to the front wheel.An innovative step is the chest and upper body support pad which enables the rider to relieve strain of the back muscles and provide a surface against which to pull the handlebars.