Bicycle Derailleur Chain Guide Independent Mounting
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Solution Overview
Problem
Existing chain guide devices for bicycles require simultaneous adjustment and alignment with the chain thrower, making independent assembly and alignment challenging, especially in competitive situations where precise positioning is critical.
Innovation Solution
A chain guide device with an additional mounting means allows independent assembly and alignment of the chain guide device and chain thrower, utilizing a mounting screw with a conical peripheral surface and contact surface for secure angular fixation, and an adjusting screw for fine angular adjustments, enabling easier installation and alignment relative to the bicycle frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a chain guide device is mounted directly on the chain thrower using a single screw, then the structure is simplified, but the alignment and positioning precision deteriorates
Solution Approach 1:
The mounting system is divided into two independent parts: the chain thrower mounting to the frame, and the chain guide device mounting to the chain thrower. This segmentation allows each component to be aligned and adjusted independently, solving the contradiction between simplified structure and precise alignment.
Solution Approach 2:
The chain thrower is first mounted and aligned to the frame using the fastening screw with elongated hole. Then the chain guide device is subsequently mounted to the already-positioned chain thrower using the additional mounting screw. This preliminary action ensures precise final positioning without requiring simultaneous alignment of all components.
2Device complexity
If the chain guide device is mounted using a single fastening screw, then the number of components is reduced, but the adjustment flexibility and positioning accuracy deteriorate
Solution Approach 1:
The mounting system provides dynamic adjustment capability through two screws: the fastening screw with elongated hole allows gross positioning adjustments, while the additional mounting screw enables fine-tuning of the chain guide device angle and position. This dynamic adjustment process resolves the contradiction between simple structure and operational flexibility.
Solution Approach 2:
The system allows independent adjustment of multiple parameters: the vertical position of the chain thrower via the elongated hole, and the angular orientation of the chain guide device via the additional mounting screw. This multi-parameter adjustment capability provides the needed flexibility without complicating the overall structure.
3Manufacturing precision
If simultaneous alignment of chain thrower and chain guide device is required, then positioning accuracy is improved, but the assembly time and complexity increase
Solution Approach 1:
The chain thrower is first mounted and aligned to the frame using the fastening screw with elongated hole before the chain guide device is attached. This preliminary action eliminates the need for simultaneous alignment, reducing assembly time while maintaining positioning accuracy through sequential adjustment.
Solution Approach 2:
The alignment process is segmented into two independent stages: first aligning the chain thrower to the frame, then aligning the chain guide device to the chain thrower. This segmentation of the alignment process reduces the complexity of simultaneous alignment and decreases assembly time.
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
Facilitates simplified assembly and adjustment of the chain guide device, allowing for precise positioning without the need for simultaneous alignment with the chain thrower, enhancing usability and performance in competitive scenarios.
Implementation Method 1
A mounting screw (19) is arranged in the mounting opening (13) and brings the peripheral surface (16) in the mounting section (15) into frictional contact with the contact surface (12) on the fastening screw head (8)
Data Source
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AI summary
The arrangement has a chain guiding unit (1) i.e. chain catcher, installed on a base part (5) of a front derailleur (4) on a bicycle. The chain guiding unit includes a mounting section (15) including a mounting opening (13). A guide section (14) is arranged with an offset from the mounting section and positioned adjacent to a drive chain. A connecting section (17) is arranged between the mounting and guide sections, and a chain guide mounting element (2) is fastened with the mounting section at the base part when the derailleur is operatively attached to a bicycle frame (30). An independent claim is also included for a method for installing a chain guide member on a front derailleur for a bicycle with a chain guide mounting element.