Bicycle Gearshift Locking Mechanism for Dirt Resistance
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Solution Overview
Problem
The existing locking devices for bicycle gearshifts are structurally complex and prone to dirt or water ingress, compromising their reliability.
Innovation Solution
A simplified locking device with a single pin sliding in a through cavity, featuring an actuation end portion and a locking end portion that abuts the connection member to prevent rotation, ensuring reliable operation and ease of maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device with two distinct cavities and two distinct pins is used, then the gearshift can be locked in a pulled-back position, but the structural complexity increases and reliability decreases due to exposed cavities prone to dirt or water ingress
Solution Approach 1:
The patent merges two separate cavities and two separate pins into a single integrated cavity and a single pin with dual functional portions. The pin comprises a locking end portion that engages with the connection member and an actuation end portion that interacts with the spring mechanism, all within one unified cavity in the first body. This consolidation reduces structural complexity while maintaining the locking function.
Solution Approach 2:
The patent employs a spring element housed within the single cavity to provide the necessary elastic force for locking and unlocking operations. The spring acts as a flexible component that enables the pin to move between locked and unlocked positions while being protected within the enclosed cavity structure, preventing dirt or water ingress.
2Reliability
If two distinct cavities are used in the locking device, then the locking function can be achieved, but the exposed cavities become receptacles for dirt or water compromising operation
Solution Approach 1:
By consolidating two separate cavities into a single integrated cavity housing the pin and spring mechanism, the patent reduces the number of exposed openings. The unified cavity structure minimizes the surface area exposed to the external environment, thereby reducing the risk of dirt or water ingress while maintaining all necessary locking functions.
Solution Approach 2:
The patent design allows the spring element to be housed within the protected cavity, converting what could be a vulnerability (enclosed space) into a protective feature. The enclosed cavity shields the spring and pin mechanism from environmental contaminants, ensuring reliable operation even in harsh conditions.
Data Source
AI summary
The invention relates to a bicycle gearshift comprising a locking device acting between a connection member and a first body. The locking device comprises a pin slidable along a sliding axis in a through cavity formed on said first body and comprising an actuation end portion to be actuated in order to command shifting from a first operative configuration to a second operative configuration, and an opposite locking end portion that, when said locking device is in said second operative configuration, is in abutment against said connection member thus preventing a relative rotation between said first body and said connection member. When said locking device is in said second operative configuration said actuation end portion is arranged at one side of said connection member and said locking end portion is arranged at the other side of said connection member.