Lock Tumbler Gate Structure for Tamper Resistance
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Solution Overview
Problem
Existing locks, particularly those for firearms, lack effective tampering resistance and secure coding mechanisms, making them vulnerable to unauthorized use or information extraction.
Innovation Solution
A lock design featuring cylindrical tumblers with distinct positions, including a real and false gate system, a spring-biased comb, and a sheathing mechanism that provides enhanced resistance to tampering by mimicking the feel of the correct code, preventing shims from acquiring information and ensuring secure transition between lock and unlock conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional locking mechanism is used, then the structure is simple, but the resistance to tampering is insufficient
Solution Approach 1:
The locking mechanism is divided into multiple independent tumblers (at least three), each with its own gate structure. This segmentation allows the lock to provide enhanced security through combination requirements while maintaining manageable complexity in each individual component.
Solution Approach 2:
The gate structure is nested within each tumbler, with the gate being a recess or void in the tumbler body. The comb mechanism is nested within the lock housing and interacts with the tumblers. This nesting approach integrates multiple functions into compact structures, improving tampering resistance without proportionally increasing overall device complexity.
2Reliability
If multiple tumblers with coded positions are used, then the security against unauthorized access is improved, but the difficulty of detecting and measuring the coded position increases
Solution Approach 1:
Each tumbler is designed with non-uniform gate structures - the real gate has specific dimensional characteristics that differ from false gates. This local quality variation in the gate regions allows the comb to detect the correct position through tactile feedback while maintaining security, as the unique gate geometry provides distinguishable feedback only at the correct coded position.
Solution Approach 2:
The false gates are designed to replicate the appearance and general structure of the real gate, creating deceptive copies that feel similar during manipulation. This copying approach prevents unauthorized users from easily distinguishing the real gate through tactile sensing, thereby increasing the difficulty of detecting the correct coded position without compromising the actual security function.
3Reliability
If false gates are added to mimic the real gate, then the resistance to information extraction is improved, but the device complexity increases
Solution Approach 1:
The false gates are merged into the same tumbler body as the real gate, rather than being separate components. Multiple gates (one real, multiple false) are integrated into a single tumbler structure, allowing the tumbler to provide both security functionality and deceptive feedback without requiring additional separate mechanisms, thus limiting the increase in device complexity.
Solution Approach 2:
The gates (both real and false) are localized features within the tumbler body, concentrated in specific regions rather than distributed throughout the entire structure. This localization allows the complex gate structures to be contained within specific areas of the tumblers, minimizing the overall impact on device complexity while maximizing the resistance to information extraction at critical points.
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
The lock provides robust resistance to tampering and secure operation by ensuring only the correct code can unlock the firearm or container, preventing unauthorized access and information extraction, while maintaining ease of use for authorized users.
Implementation Method 1
A spring biased comb, with a tooth for each tumbler. The comb is free to traverse the tumblers in order to release or open the locking device
Data Source
AI summary
A lock has improved protection against lock picking. The lock comprises plural tumblers, each generally cylindrical in form with outer and inner circumferential edges, all the tumbles arranged on a common axis. The outer circumferential edge of each tumbler having a single true gate, including a void extending a predetermined distance toward the axis and plural false gates, each having a void of lesser extent. Ridges separates the true gate from adjacent false gates, and separate adjacent false gated from each other. The lock also includes a sheath contacting the inner circumferential edges of the tumblers. The sheath includes ridges located to maintain the tumblers in contact with each other.