Locking Pin Assembly Segmentation for Key Bumping Resistance
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Solution Overview
Problem
Cylinder locks are vulnerable to key bumping techniques, which allow unauthorized access by creating a duplicate key with maximum-depth punchings and impacting it to rotate the barrel pins, compromising security against burglary.
Innovation Solution
The implementation of a locking pin assembly with a barrel pin assembly and a column pin assembly, featuring a biaser and stopper mechanism, along with a key blade design that includes specific surface topologies and geometries to prevent the alignment necessary for key bumping, ensuring the barrel pins remain misaligned unless the correct key is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional barrel pins are used in the lock, then the lock structure is simple, but the lock is vulnerable to key bumping attacks
Solution Approach 1:
The locking pin assembly is divided into two separate assemblies: a barrel pin assembly and a column pin assembly. The barrel pin assembly includes a barrel pin that moves within a barrel pin sheath, while the column pin assembly includes a column pin that moves within a column pin sheath. This segmentation creates independent movement paths for different pin types, preventing the simultaneous alignment that enables key bumping attacks.
Solution Approach 2:
The barrel pin is nested within the barrel pin sheath, and the column pin is nested within the column pin sheath. Each pin can slide independently within its respective sheath along the longitudinal axis. This nested structure allows for complex pin movement patterns that cannot be simultaneously manipulated by a bumping key, thereby enhancing security while maintaining a relatively compact assembly.
2Reliability
If maximum-depth punchings are used in the bumping key, then all barrel pins can be pushed to maximum height, but this allows unauthorized rotation of the barrel
Solution Approach 1:
Different pin assemblies (barrel pin and column pin) have different movement characteristics and engagement requirements. The barrel pin assembly engages with the barrel at one location, while the column pin assembly engages with the housing at another location. This local differentiation means that a single key design cannot simultaneously manipulate both pin assemblies to their critical positions, preventing unauthorized access while maintaining proper operation with the correct key.
Solution Approach 2:
The pin assemblies are designed to move dynamically within their sheaths during key insertion and rotation. The barrel pin and column pin can slide independently along their respective longitudinal axes, creating a dynamic security mechanism that responds differently to various key insertion forces and angles. This dynamic behavior prevents the static alignment required for successful key bumping.
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
Enhances security by preventing unauthorized key bumping attempts, ensuring the lock can only be opened with the correct key, thereby increasing resistance to burglary attempts.
Implementation Method 1
a biaser disposed beneath the stopper and coupled to the column pin, operable to bias the column pin and cylindrical sheath away from the stopper
Data Source
AI summary
The disclosure relates to an improved cylinder lock, key and their combination. More specifically, the disclosure relates to a locking pin assembly operable to provide added combination and increase security against burglary, such as by key bumping, a cylinder lock incorporating the locking pin assembly and key blade and key blade assemblies having the configuration to actuate the locking pin assembly.