Reversible Bearing Plates for Bicycle Head Angle Adjustment
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Solution Overview
Problem
Current bicycle systems require different bikes for varying head angles or alter other geometries, making it difficult to achieve optimal stability and maneuverability for different riding purposes without introducing complex components prone to fouling.
Innovation Solution
A head tube apparatus using reversible bearing plates that can be quickly adjusted to slacken or steepen the head angle by fitting within an existing or new bicycle head tube design, allowing for easy reconfiguration of the steerer tube's angle relative to the head tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different bicycles are used for different head angles, then riding performance is optimized for specific purposes, but device complexity and cost increase
Solution Approach 1:
The patent implements a dynamic head tube assembly that allows the head angle to be changed during the bicycle's service life. The reversible bearing plates can be removed and reinstalled in different orientations to alter the head angle, transforming a static structure into a dynamic, adjustable one. This resolves the contradiction by providing multiple head angle configurations within a single bicycle system without requiring multiple complete bicycles.
Solution Approach 2:
The head tube assembly is segmented into separable components: the bearing plates can be independently removed from the head tube. This segmentation allows the bearing plates to be reversed or replaced to change the head angle, enabling adaptability while keeping the rest of the bicycle structure intact and simple.
2Adaptability or versatility
If offset bushings are placed in the rear shock absorber to slacken the head angle, then head angle adjustment is achieved, but device complexity increases and other geometries are altered
Solution Approach 1:
The patent extracts the head angle adjustment function from the rear shock absorber system and relocates it to the head tube assembly. By placing the adjustable bearing plates directly in the head tube, the invention eliminates the need for complex offset bushings in the rear suspension, reducing overall device complexity while maintaining head angle adjustability.
Solution Approach 2:
The reversible bearing plates act as an intermediary mechanism within the head tube that directly controls the head angle. This intermediary component provides a simple, localized solution for head angle adjustment without affecting other bicycle geometries or requiring modifications to the rear suspension system.
3Adaptability or versatility
If angle headsets with offset cups and gimbals are used to change the head angle, then head angle adjustment is possible, but device complexity increases and reliability decreases due to more moving parts
Solution Approach 1:
Instead of using complex angle headsets with multiple moving parts like offset cups and gimbals, the patent inverts the approach by using simple, reversible bearing plates that can be manually reoriented. This inverted solution reduces the number of moving parts, eliminating fouling issues while maintaining the ability to configure different head angles.
Solution Approach 2:
The bearing plates are designed to be easily removed and reinstalled by the rider or owner without requiring specialized tools or complex procedures. This self-service capability simplifies the adjustment process and reduces reliance on complex mechanical systems, thereby improving reliability while maintaining configurability.
Data Source
AI summary
A system for manipulating the steering axis angle of an object is provided. The system is beneficial for improving performance and enjoyability of use for objects employing a steering axis, including bicycles, toys, tools, sporting goods, and other modes of transportation. The system includes a reversible bearing plate with a bearing plate bore that permits passage of a steerer tube through a head tube when reversible bearing plates are installed at the head tube ends. The bearing plate bore may be at the center of the reversible bearing plate to maintain a steering axis coaxial with the head tube central axis. The bearing plate bore may be offset from the center of the reversible bearing plate and may employ an angled annular space such that when reversible bearing plates are installed oppositely at the head tube ends, the steering axis is offset from the center of each reversible bearing plate generating an angle between the steerer tube central axis and the head tube central axis, resulting in a correspondingly steeper or slacker head angle. Methods of employing reversible bearing plates for maintaining, steepening, or slackening the head angle of a bicycle are provided.