Security Key with Axial Window and Rotating Rollers
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Solution Overview
Problem
Existing security key duplication methods are insecure due to the ease of replicating bit keys with complex machining, and there is a need for a mechanism to enhance key uniqueness and security.
Innovation Solution
A security key design featuring a blade with an axial window and rollers of varying diameters, which cooperate with pins in the lock cylinder, making duplication difficult and enhancing security by providing a unique signature pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bit keys with engraved impressions are used, then key duplication is relatively easy through machining, but security is compromised
Solution Approach 1:
The key blade is segmented into multiple functional elements: rollers mounted on spindles, each roller having a specific diameter that corresponds to pin positions in the lock cylinder. This segmentation creates a complex signature pattern that is difficult to replicate through simple machining.
Solution Approach 2:
The invention transitions from traditional 2D engraved impressions on the key blade to 3D rollers that protrude from the blade surface. These rollers create a three-dimensional signature pattern that interacts with pins in the lock cylinder, adding a dimensional complexity that significantly increases duplication difficulty.
2Reliability
If complex machining is used to create unique key patterns, then security is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of creating unique patterns through complex machining of each key, the invention uses a standardized key blade design with interchangeable rollers. The uniqueness is achieved by selecting and positioning specific rollers with different diameters, which simplifies the manufacturing process while maintaining high key uniqueness.
Solution Approach 2:
The invention changes the parameter of key signature from engraved depth variations to roller diameter variations. By using rollers with different diameters positioned at specific locations, the system creates unique key signatures through parameter selection rather than complex machining operations.
3Reliability
If asymmetric key designs are used to prevent unauthorized duplication, then security is improved, but ease of operation is reduced as keys cannot be inserted in either direction
Solution Approach 1:
The invention uses asymmetric roller configurations to create unique security signatures. Each key has a specific arrangement of rollers with different diameters at different positions, creating an asymmetric pattern that provides security while the overall key blade remains symmetric for bidirectional insertion.
Data Source
AI summary
A key includes a blade having an axially-extending window formed by an opening through a thickness of the blade between two opposite faces thereof, and a set of rollers mounted in series along the window, with each roller being freely rotatable around a spindle fixed transversely across the window in a width direction of the blade. The key may be a security key designed to cooperate with a pin tumbler cylinder.