Segmented Lock Pin Structure to Eliminate Picking Counterrotation
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Solution Overview
Problem
Conventional pin tumbler locks are vulnerable to picking attacks due to manufacturing imperfections and skilled attackers can exploit counterrotation feedback from spool pins, allowing them to manipulate and unlock the locks.
Innovation Solution
The introduction of segmented driver and key pins with movably joined right cylinders that prevent counterrotation feedback during picking attempts, enhancing security by preventing attackers from feeling the presence of the pins and setting them correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driver pins are used in pin tumbler locks, then the lock structure is simple and easy to manufacture, but the lock is vulnerable to picking attacks due to counterrotation feedback
Solution Approach 1:
The driver pin is divided into multiple segments (first segment, second segment, third segment) that can move independently relative to each other. This segmentation prevents the pin from providing counterrotation feedback to attackers during picking attempts, as the segments can shift independently rather than rotating as a single unit, thereby enhancing security while maintaining a relatively simple overall structure.
Solution Approach 2:
The driver pin transitions from a static, rigid structure to a dynamic, multi-segmented structure where segments can move relative to each other. This dynamic behavior allows the pin to absorb and dissipate manipulation forces without providing the consistent rotational feedback that characterizes conventional pins, making picking attacks significantly more difficult.
2Ease of operation
If spool pins are used to prevent binding during picking, then the pin can move freely, but skilled attackers can detect the presence of spool pins through counterrotation feedback
Solution Approach 1:
The driver pin is divided into multiple segments (first segment, second segment, third segment) that can move independently relative to each other. This segmentation prevents the pin from providing counterrotation feedback to attackers during picking attempts, as the segments can shift independently rather than rotating as a single unit, thereby enhancing security while maintaining a relatively simple structure.
Solution Approach 2:
The driver pin transitions from a static, rigid structure to a dynamic, multi-segmented structure where segments can move relative to each other. This dynamic behavior allows the pin to absorb and dissipate manipulation forces without providing the consistent rotational feedback that characterizes conventional pins, making picking attacks significantly more difficult.
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 segmented pins significantly reduce the likelihood of successful picking attempts by eliminating counterrotation feedback, making the lock more secure without requiring new keys or complex retrofitting.
Implementation Method 1
The spring 110 forces the driver pin 102 to span the shear line 112 between the plug 102 and the hull 104 when no key is inserted into the keyway of the lock 100
Implementation Method 2
When the correct key is inserted into the keyway of the lock 100, it pushes the pin stack upwards, positioning the top of the key pin 106 and the bottom of the driver pin 108 to align with the shear line 112
Data Source
AI summary
A segmented lock pin is presented. The segmented lock pin includes a first right cylinder, a second right cylinder, and a coupling member. The first right cylinder is movably joined to the second right cylinder by the coupling member. The first right cylinder is axially, laterally, and rotationally movable with respect to the second right cylinder. When implemented as a driver pin, the segmented lock pin provides no counterrotation feedback during a picking attempt of a lock in which the segmented driver pin is installed once the first right cylinder of the segmented driver pin is in a hull of the lock, the second right cylinder of the segmented driver pin is in a plug of the lock, and an edge of the second right cylinder engages the hull of the lock.