Derailleur Mounting Bracket With Rotation Restriction
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Solution Overview
Problem
Existing bracket systems for derailleurs on human-powered vehicles lack a simplified structure to restrict rotation relative to the frame, leading to inaccuracies in derailleur positioning during adjustments.
Innovation Solution
A bracket apparatus with a restriction member and restriction opening that limits the rotation of the bracket body relative to the frame, using a threaded engagement system for secure attachment and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simplified bracket structure is used for mounting the derailleur, then the device complexity is reduced, but the rotation of the bracket body relative to the frame cannot be restricted, leading to positioning inaccuracy
Solution Approach 1:
The bracket is divided into separate functional components: a bracket body for mounting, a restriction member for limiting rotation, and a fastening member for securing to the frame. This segmentation allows each component to be optimized independently while maintaining overall simplicity.
Solution Approach 2:
The restriction member acts as an intermediary element between the bracket body and the frame, providing rotational limitation without requiring complex integration. It can be positioned in a restriction opening or attached separately to achieve the desired rotational constraint.
2Device complexity
If the restriction member is integrated into the bracket body, then the device complexity is reduced, but the design flexibility and adjustability are limited
Solution Approach 1:
The restriction member is designed as a separate component that can be independently positioned in the restriction opening or attached to the bracket body. This segmentation provides design flexibility while maintaining structural simplicity.
Solution Approach 2:
The restriction member can be made adjustable or repositionable within the restriction opening, allowing the bracket to adapt to different mounting configurations and derailleur positions while maintaining rotational limitation.
3Adaptability or versatility
If the restriction member is made as a separate component, then the design flexibility is improved, but the device complexity increases
Solution Approach 1:
The bracket system is segmented into distinct components (bracket body, restriction member, fastening member) that can be manufactured and assembled separately. This segmentation improves design flexibility while keeping individual components simple.
Solution Approach 2:
The restriction member serves multiple functions: it limits rotation of the bracket body, provides a reference for positioning, and can be integrated with the fastening mechanism. This multi-functionality reduces the need for additional separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of derailleur positioning by preventing unwanted rotation, allowing for easier and more precise adjustments while maintaining a simplified structural design.
Implementation Method 1
The restriction member includes an external thread. At least one of the restriction opening and the additional opening includes a threaded hole configured to be threadedly engaged with the external thread of the restriction member.
Data Source
AI summary
A bracket apparatus for mounting a derailleur to a frame of a human-powered vehicle comprises a bracket body and one of a restriction member and a restriction opening. The bracket body includes a frame attachment portion configured to be attached to the frame of the human-powered vehicle and a derailleur attachment portion to which the derailleur is to be attached. The restriction member is configured to be at least partly provided in the restriction opening to restrict a rotation of the bracket body relative to the frame of the human-powered vehicle in a bracket mounting state where the bracket apparatus is mounted to the frame of the human-powered vehicle.