Shaped Driver Pin for Bump Resistant Cylinder Lock
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Solution Overview
Problem
Conventional pin tumbler cylinder locks are vulnerable to unauthorized manipulation using the Bump or Bumpkey method, which exploits the physical phenomenon of impact and momentum, posing a significant security risk as hundreds of millions of locks worldwide are susceptible to this technique.
Innovation Solution
The design of specially configured driver pins with a smaller diameter intermediate section and a lip structure where the outer surface is in contact with the tumbler pin and the inner surface is below the shear line, preventing driver pins from being forced above the shear line during bumping attempts, and a method for retrofitting existing locks to enhance bump resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional driver pins are used in pin tumbler locks, then the locks can be easily operated with properly cut keys, but the locks become vulnerable to bumping attacks that exploit impact and momentum to force driver pins above the shear line
Solution Approach 1:
The driver pin is given a non-uniform geometry with a smaller diameter intermediate section and a lip structure. This local variation in the pin's physical properties creates a geometric constraint that prevents the pin from being forced completely above the shear line during bumping attempts, while still allowing proper key operation.
Solution Approach 2:
The driver pin features an asymmetric lip structure with a smaller diameter intermediate section. This asymmetric geometry creates different behavioral characteristics for the pin during normal operation versus bumping attacks, allowing easy operation with proper keys while resisting forced entry through impact.
2Reliability
If driver pins are designed with a smaller diameter intermediate section and lip structure to prevent bumping, then bump resistance is enhanced, but the device complexity increases
Solution Approach 1:
The driver pin is segmented into distinct geometric zones: a smaller diameter intermediate section and a lip structure with specific outer and inner surfaces. This segmentation allows each portion to serve a specific function - the lip contacts the tumbler pin while the inner surface remains below the shear line, preventing complete pin displacement during bumping.
Solution Approach 2:
The driver pin's geometric parameters are specifically modified to create the lip structure and smaller diameter section. By changing the diameter and creating protruding lip features, the pin's physical characteristics are altered to provide bump resistance while maintaining compatibility with existing lock mechanisms.
3Reliability
If the inner surface of the driver pin lip is positioned below the shear line, then the plug cannot be rotated during bumping attempts, but the manufacturing precision requirements increase
Solution Approach 1:
The driver pin is pre-configured with the lip structure and smaller diameter section during manufacturing, positioning the inner surface of the lip below the shear line before installation. This preliminary geometric configuration ensures that during bumping attempts, the pin geometry itself prevents complete displacement above the shear line, providing inherent bump resistance.
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 solution effectively prevents the opening of locks by bumping by ensuring the inner surface of the driver pin lip remains below the shear line, thereby preventing the plug from being rotated, thus enhancing the security of cylinder locks against unauthorized access.
Implementation Method 1
The cylinder body houses a further set of cylindrical pins, which are pressed towards the center by helical springs.
Implementation Method 2
This method employs the well-known physical phenomenon of impact and momentum.
Data Source
AI summary
The present invention provides a pin and tumbler cylinder lock and a retrofitted cylinder lock which minimizes unauthorized openings of the lock by bumping. The cylinder lock utilizes specially designed driver pins which are correlated in size to the largest possible stack height of the tumbler pins with a bump key inserted in the plug portion of the lock and the shear line height of the lock. All the driver pins are about the same height and preferably symmetrical with a lip on each end. The invention also provides a method for retrofitting existing locks by removing at least one of the driver pins and replacing the removed driver pin or pins with the driver pins of the invention.