Hoop Lock with Dual Locking for Tamper Resistance
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Solution Overview
Problem
Shackle-type locks, such as U-locks, face limitations in resistance to tampering and high pull forces, necessitating improvements in their security and structural integrity.
Innovation Solution
A hoop lock design featuring a shackle with a straight foot and a bent foot, secured by a locking assembly that includes a primary bolt and a secondary bolt, which engage notches on the feet to prevent rotation and ensure secure coupling to a crossbar, even if the shackle is cut, combined with a cam mechanism for locking and unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single locking mechanism is used in shackle locks, then the device complexity is reduced, but the resistance to tampering and attack is insufficient
Solution Approach 1:
The locking assembly is segmented into multiple independent locking elements (first locking element and second locking element) that engage with different feet of the shackle. This segmentation allows each element to provide independent security, so that if one is compromised, the other remains functional, thereby improving tamper resistance without requiring a completely complex integrated system.
Solution Approach 2:
The locking elements are designed to engage with the shackle feet in a predetermined sequence and configuration. The first locking element engages the first foot while the second locking element engages the second foot, creating preliminary secure attachment points that prevent tampering before any single point of failure can occur.
2Strength
If the shackle is made more secure against cutting, then the structural integrity is improved, but the ease of operation for legitimate users may be reduced
Solution Approach 1:
The shackle is divided into multiple feet (first foot and second foot) that are independently engaged by separate locking elements. This segmentation allows the shackle to maintain high structural integrity through its robust multi-foot design while enabling easy operation through the independent locking mechanism that can be quickly engaged or disengaged by the user with proper authorization.
Solution Approach 2:
The locking elements act as intermediaries between the user's unlocking action and the shackle's structural components. When the user operates the locking mechanism, the locking elements mediate the force application, allowing easy disengagement of the secure shackle structure without requiring direct force on the shackle itself, thus maintaining both strength and ease of operation.
3Force
If dual locking elements are used to engage both feet, then the resistance to high pull forces is improved, but the device complexity increases
Solution Approach 1:
The locking assembly is segmented into two independent locking elements, each responsible for engaging one foot of the shackle. This segmentation distributes the pull force across two separate engagement points rather than concentrating it on a single locking mechanism, thereby doubling the resistance to pull forces while maintaining a relatively simple overall structure through modular design.
Solution Approach 2:
The first locking element and second locking element are combined within a single locking assembly housing, creating an integrated dual-locking system. This merging allows the assembly to provide enhanced force resistance through dual engagement points while avoiding the complexity of two completely separate locking mechanisms, as both elements are coordinated through a unified structural framework.
Data Source
AI summary
A hoop lock including a shackle, a crossbar, and a locking assembly operable to secure the shackle to the crossbar. The shackle may include a straight foot and a bent foot, and the locking assembly may engage the straight foot and the bent foot to secure the shackle to the crossbar.