Bicycle Rear Derailleur Locking Mechanism for Single-Handed Chain Removal
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Solution Overview
Problem
Conventional bicycle rear derailleurs are inconvenient for detachment and chain removal due to the need to overcome the elastic force of a torsion spring, requiring two hands and complex operation.
Innovation Solution
A bicycle rear derailleur design featuring a linkage assembly, chain guiding assembly, and a locking mechanism that allows single-handed operation by transitioning between a fixed and released state, enabling easy detachment of the chain or derailleur by pivoting the chain guiding assembly without the need to overcome the torsion spring's elastic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torsion spring is disposed between the four-link mechanism and chain guiding assembly to maintain chain tension, then the chain tension is maintained, but the removal of the chain or rear derailleur requires two hands to overcome the elastic force of the torsion spring
Solution Approach 1:
The patent implements a dynamic locking mechanism that transitions between locked and unlocked states. The locking component engages with the releasing component to prevent unintended movement during normal operation, but can be easily disengaged when needed. This dynamic system allows the chain guiding assembly to remain stable during use while enabling simple one-handed removal when the locking mechanism is disengaged, resolving the contradiction between maintaining chain tension reliability and ease of operation for removal.
2Stability of the object's composition
If the chain guiding assembly is kept fixed to maintain chain tension, then the chain remains tensioned, but the operation to detach or remove the chain becomes complex and requires two hands
Solution Approach 1:
The patent divides the chain guiding assembly into separable components with a locking mechanism that can be independently engaged or disengaged. The locking component and releasing component are designed as separate elements that interact through a simple interface. This segmentation allows the assembly to function as a unified stable structure during operation, while enabling simple one-handed detachment by disengaging the locking component from the releasing component, thereby reducing operational complexity.
3Ease of operation
If a locking mechanism is added to enable easy detachment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-locking through the interaction between the locking component and releasing component. The locking component automatically engages with the releasing component to maintain the fixed position, eliminating the need for additional actuators or complex control systems. This self-service design provides reliable one-handed operation capability while minimizing the increase in device complexity, as the locking and releasing functions are achieved through a simple mechanical interaction between two 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
Facilitates convenient and easy removal of the bicycle chain or derailleur by allowing single-handed operation of the locking mechanism, reducing the complexity and effort required for detachment.
Implementation Method 1
The opposite ends of the first elastic component are respectively fixed to the movable component and the first assembling component so as to provide a torque that allows the first assembling component to be pivotable with respect to the movable component
Implementation Method 2
The locking mechanism has a fixed state and a released state. When the fixed component is in the fixed state, the locking mechanism allows the chain guiding assembly and the first assembling component to be moved together
Data Source
AI summary
The disclosure provides a bicycle rear derailleur including a linkage assembly, a chain guiding assembly, a first assembling component, a first elastic component and a locking mechanism. The linkage assembly is a four-link mechanism and includes a fixed component, a movable component, a first link and a second link. The chain guiding assembly is pivotably connected to the movable component. The first assembling component is pivotably connected to the movable component and disposed between the first assembling component and the chain guiding assembly. The opposite ends of the first elastic component are respectively fixed to the movable component and the first assembling component so as to provide a torque that allows the first assembling component to be pivotable with respect to the movable component.