Adjustable Bicycle Shifter for Multi-Speed Drive Trains
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Solution Overview
Problem
Bicycle operating devices with indexing arrangements are typically designed for specific numbers of gear positions, requiring riders to change the device when switching between drive trains with different numbers of gear positions, limiting their versatility.
Innovation Solution
A bicycle operating device comprising a base member, positioning ratchet, holding member, and restricting member, allowing the rider to selectively regulate between different sets of operating positions, enabling operation of drive trains with varying numbers of gear positions through a combination of holding and restricting mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bicycle operating device is designed with a fixed indexing arrangement for a specific number of gear positions, then the device provides reliable and precise gear shifting for that configuration, but the device cannot be used with drive trains having different numbers of gear positions
Solution Approach 1:
The patent applies the dynamics principle by making the indexing arrangement adjustable rather than fixed. The restricting member can be positioned at different locations along the ratchet mechanism to dynamically change the number of gear positions. This allows the same physical device to adapt to different drive train configurations (e.g., 8-speed, 9-speed, 10-speed) without requiring multiple different devices, thus resolving the contradiction between versatility and structural complexity.
Solution Approach 2:
The patent implements parameter changes by modifying the effective number of gear positions through repositioning the restricting member. By changing the position of the restricting member along the ratchet, the device changes its operational parameter (number of gear positions) to match different drive trains. This parameter adjustment enables a single device to serve multiple purposes while maintaining the simplicity of the base indexing structure.
2Adaptability or versatility
If the bicycle operating device is made versatile to work with multiple drive trains, then the rider does not need to change devices, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the indexing arrangement into functional segments: the ratchet mechanism, the holding member, and the restricting member. The restricting member acts as a separate, movable segment that can be independently positioned to define different gear position ranges. This segmentation allows the versatile functionality to be achieved through a simple additive component rather than a complex integrated mechanism, maintaining ease of manufacture while providing adaptability.
Solution Approach 2:
The patent embodies universality by designing a single device that can perform multiple functions - operating with different numbers of gear positions (e.g., 8, 9, or 10 speeds) depending on the restricting member position. The base indexing arrangement serves as a universal foundation that works with all compatible drive trains, and the optional restricting member configuration enables adaptation to specific requirements without redesigning the entire device.
3Ease of manufacture
If the indexing arrangement is simplified to reduce manufacturing complexity, then the device is easier to manufacture, but it cannot accommodate different numbers of gear positions
Solution Approach 1:
The patent applies preliminary action by pre-configuring the restricting member with multiple possible positions during manufacturing. The restricting member is designed with features (such as positioning slots or engagement surfaces) that allow it to be set to different locations along the ratchet. This preliminary preparation of adjustment capability means the device can be manufactured simply as a base unit with the potential for adjustment, and the versatility is activated through user configuration rather than complex factory assembly.
Data Source
AI summary
A bicycle operating device includes a base member, a positioning ratchet, a holding member and a restricting member. The holding member moves between a holding position and a releasing position to selectively establish a plurality of gear positions. The holding member prevents movement of the positioning ratchet while the holding member is in the holding position, and releases the positioning ratchet for movement while the holding member is in the releasing position. The restricting member moves between a non-restricting position and at least one restricting position in which the restricting member restricts movement of the positioning ratchet. The positioning ratchet moves in a first set of the gear positions while the restricting member is in the non-restricting position. The positioning ratchet moves in a second set of the gear positions while the restricting member is in the at least one restricting position.