Flat Key End-Face Surface Coding for Cylinder Lock Copy Protection
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Solution Overview
Problem
Modern high-resolution cameras and copying machines can easily replicate torsionally twisted profile elements on conventional flat keys, making unauthorized key copies feasible.
Innovation Solution
A flat key design featuring surface codes on the end face with non-linear courses along one, two, or three Cartesian axes, integrated with spherical coding elements, and a cylinder lock with a multi-component coupling assembly and adapter for precise scanning, making it difficult to produce photographic images and replicate the key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional torsionally twisted profile elements are used on the key tip, then the key can be easily copied using high-resolution cameras and copying machines, but the manufacturing process is simple and well-established
Solution Approach 1:
The patent moves the coding elements from the traditional side surfaces of the key tip to the end face of the key tip. This dimensional change from lateral positioning to end-face positioning creates a new spatial arrangement that cannot be captured by conventional copying methods designed for side-profile scanning, thereby enhancing copy protection while maintaining manufacturing feasibility
Solution Approach 2:
The patent incorporates spherical coding elements (code spheres) on the end face of the key tip. These spherical features create three-dimensional coded information that is significantly more difficult to replicate with conventional two-dimensional copying methods, providing enhanced security against unauthorized key duplication while remaining manufacturable through standard machining processes
2Reliability
If surface codes are arranged on the end face of the key tip with non-linear courses, then photographic copying becomes significantly more difficult, but the scanning and detection system becomes more complex
Solution Approach 1:
The spherical coding elements provide three-dimensional coded information that can be scanned using optical or mechanical sensors. The spherical geometry allows for robust detection despite variations in scanning angle or position, as the coded information is distributed across the curved surface, making the detection process more tolerant of positioning errors while maintaining high copy protection
Solution Approach 2:
The patent employs non-linear courses for the surface codes along the spatial axes, creating complex three-dimensional patterns that are difficult to photograph and replicate. These parameter variations in code arrangement provide enhanced security while the coding structure remains systematically organized to allow for automated scanning and detection by the cylinder lock's reading mechanism
Data Source
AI summary
The invention relates to a flat key (1) for a cylinder lock (11), said flat key comprising: a key bow (2) and a key shaft (3) that extends substantially parallel to a key longitudinal axis (L) and has a key tip (4), wherein at least one surface coding (6) designed to be read in the cylinder lock (11) is located at the end face (5) of the key tip (4); and a cylinder lock (11) for receiving such a flat key (1), and a locking system comprising one or more such flat keys (1) in combination with one or more such cylinder locks (11).