Pick-Resistant Handcuff with Central Rail Locking Mechanism
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Solution Overview
Problem
Conventional handcuffs have a poor locking effect, allowing easy unlocking by non-key tools and improper means due to simple design and large spaces between components, making them vulnerable to illegal unlocking.
Innovation Solution
The design incorporates two fixed arc-shaped hooks, a movable arc-shaped hook with projecting teeth, multiple locking members with spacers and elastic members, and a unique keyhole configuration that prevents non-key tools from unlocking and blocks narrow bodies from disengaging the locking mechanism, enhancing the locking effect by creating a more secure engagement between the movable ring hook and the accommodation chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple locking structure with single locking member is used, then the device complexity is reduced and ease of manufacture is improved, but the reliability of locking is worsened due to vulnerability to non-key tools
Solution Approach 1:
The locking mechanism is divided into multiple independent locking members (first locking member and second locking member) that can be operated separately. Each locking member has its own locking protrusion and corresponding locking groove, creating multiple independent locking points that must be simultaneously compromised for illegal unlocking, thereby significantly improving reliability without excessively complicating the overall structure.
2Ease of operation
If large spaces are left between movable ring hook and accommodation chamber for easy engagement, then the ease of operation is improved, but the reliability is worsened as narrow bodies can be inserted to disengage locking teeth
Solution Approach 1:
A stop block is introduced as an intermediary component between the movable ring hook and the accommodation chamber. The stop block includes a stop protrusion that fits into a stop groove on the movable ring hook, creating a physical barrier that prevents narrow bodies from being inserted to disengage the locking teeth, while still allowing proper engagement during normal operation.
3Ease of operation
If key hole is made accessible from outside for easy key insertion, then the ease of operation is improved, but the reliability is worsened as non-key tools can easily access and manipulate the locking mechanism
Solution Approach 1:
A cover plate is introduced as an intermediary component that covers the key hole. The cover plate includes a key hole opening that can be opened by a proper key, creating a controlled access point. This prevents non-key tools from directly accessing the locking mechanism while still allowing easy key insertion when authorized, as the cover plate opens smoothly for legitimate use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This structural modification significantly increases the difficulty of unlocking by improper means and improves the locking effect by preventing unauthorized access, ensuring a more secure restraint.
Implementation Method 1
the elastic abutting of said elastic member 4 can make locking member 3 maintain the outward elasticity of its lock projecting teeth 33 from accommodation chamber 11
Data Source
AI summary
Pick-resistant handcuffs having two fixed, arc-shaped hooks and one pivotable, arc-shaped hook. The two fixed ring hooks engage each other to form an accommodation chamber for receiving the pivoting hook penetrating into an open side of the accommodation chamber. Central channels are cut in the teeth outer periphery and accommodate a stop projecting part between the lateral edges of the teeth that inhibits unlocking the stop members of the ratchet attached to the two fixed hooks. Elastic members biased toward the teeth are disposed on either side of the stop projecting part act independently to provide ratchet stops to each tooth edge, and the stop projecting portion blocks insertion of a pick and unlock both of the two ratchets simultaneously.