Double Shackle Lock Ratchet Mechanism for Bicycle Theft Prevention
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Solution Overview
Problem
Existing bicycle locks, such as U-locks and cable locks, do not provide sufficient protection against theft, as they can be vulnerable to tools and methods used by thieves to break or cut them.
Innovation Solution
A bicycle lock design featuring a lock body with a ratchet assembly and pawl mechanism, allowing for adjustable engagement of shackles with bicycle tubes, providing enhanced security by restricting movement in the locked state and enabling bidirectional movement in the unlocked state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single shackle lock is used, then the lock is simple to operate, but the security protection is insufficient
Solution Approach 1:
The lock is divided into two separate shackles (first shackle and second shackle) that can independently engage with the bicycle frame tubes. This segmentation allows each shackle to provide independent security protection, significantly increasing the difficulty for thieves to breach the lock compared to a single shackle design.
2Reliability
If the lock body prevents all movement, then security is maximized, but the lock cannot be adjusted or unlocked
Solution Approach 1:
The lock body incorporates a ratchet assembly with a pawl that allows the second shackle to be adjusted to different positions along the rack. When locked, the pawl engages with the rack teeth to prevent movement; when unlocked, the pawl can move freely along the rack, enabling adjustment. This dynamic mechanism provides both security and adjustability.
Data Source
AI summary
A bicycle lock including a lock body having a locked state and an unlocked state. A movable shackle is operatively coupled to the lock body, wherein the lock body in the locked state prevents movement of the movable shackle, and wherein the lock body in the unlocked state enables movement of the movable shackle. A pawl is mounted to one of the lock body and the movable shackle. A rack is configured to engage the pawl, and wherein the unlocked state of the lock body enables at least one of bidirectional movement of the pawl and rotational movement of the rack away from engagement with the pawl.