Bicycle Chain Guard Segmentation for Gap Protection
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Solution Overview
Problem
Existing bicycle drive chain protective systems fail to provide comprehensive protection against contamination and unauthorized access, especially for children's bicycles, as they are not adaptable to different sprocket sizes and do not effectively prevent objects or body parts from entering the gap between the sprocket and the drive chain.
Innovation Solution
A protective cover system comprising multiple movable protective elements that encompass the drive chain and a stationary cover element to prevent access to the gap between the sprocket and the chain, with adjustable cover elements to accommodate varying sprocket sizes and configurations, ensuring protection at both the inlet and outlet of the drive chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a tubular chain guard is used to protect the drive chain, then protection against contamination is improved, but protection against unauthorized access to the sprocket gap is insufficient
Solution Approach 1:
The protective cover is divided into multiple functional elements: movable protective elements that follow the chain and stationary cover elements that seal the sprocket gaps. This segmentation allows each element to perform its specific function - the movable elements protect the chain from contamination while the stationary elements prevent unauthorized access to the dangerous gap between the sprocket and chain.
Solution Approach 2:
The stationary cover elements act as intermediaries between the movable protective elements and the sprocket gaps. These stationary elements specifically address the hazard of unauthorized access by covering the gap area, while the movable elements handle the contamination protection, creating a comprehensive protective system.
2Reliability
If a protective cover for both drive sprockets is used, then safety is improved, but adaptability to different sprocket sizes and configurations is reduced
Solution Approach 1:
The protective elements are designed to be movable rather than fixed, allowing them to adapt to different sprocket sizes and chain positions. The protective elements can move along the chain links and adjust their position dynamically, enabling the same protective cover structure to work with various sprocket configurations while maintaining safety protection.
Solution Approach 2:
The protective cover design incorporates universal features that allow it to function with different sprocket sizes and bicycle configurations. The movable protective elements can accommodate various chain positions, and the stationary cover elements can be positioned to cover different gap sizes, making the system universally applicable while maintaining comprehensive safety protection.
3Object-affected harmful factors
If multiple protective elements are used to encompass the drive chain, then protection against contamination is improved, but device complexity increases
Solution Approach 1:
The protective cover is segmented into multiple protective elements, each attached to individual chain links. This segmentation allows the protective elements to follow the chain's movement and maintain coverage as the chain moves through the drivetrain, providing comprehensive contamination protection while keeping each individual element simple in design.
Solution Approach 2:
The protective elements are merged with the chain structure itself, being attached to the chain links rather than being separate components. This integration reduces overall device complexity by combining the protective function with the existing chain structure, while still providing comprehensive contamination protection through multiple elements.
Data Source
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AI summary
A protective cover (1) for a drive chain (2), particularly for a bicycle, comprises a plurality of protective elements (5) that encircle the drive chain (2) and are movable together with the drive chain (2), wherein at least one stationary cover element (6, 7) is provided that covers a gap between a sprocket (3, 4) and the drive chain (2). This allows the drive chain (2) to be arranged in a protected manner and reduces the risk of injury at the gap.