Flat Key Coding Recesses for Enhanced Security
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Solution Overview
Problem
Existing mechanical locking systems face challenges in providing robust protection against unauthorized key copying while maintaining efficient manufacturability, as the number of possible coding positions is limited by available space on the key, and copying is relatively easy using mechanical devices.
Innovation Solution
A flat key design featuring a key blade with coding recesses that have a monotonous slope from the flat side to the narrow side, which are less defined and harder to copy, combined with a method of creating these recesses using a rotating tool that can produce them in the same operation as coding holes, enhancing security and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional coding holes are used on the key, then the key can be easily manufactured using mechanical copying devices, but the security against unauthorized key copying is reduced
Solution Approach 1:
The patent replaces traditional cylindrical coding holes with conical coding recesses that have a monotonic slope. The conical shape with a continuous sloping surface from the flat side toward the narrow side makes it difficult for mechanical copying devices to accurately reproduce the precise 3D geometry, thereby enhancing security while remaining manufacturable using specialized milling processes
Solution Approach 2:
The invention adds a new dimension to the coding system by creating recesses that extend into the key body with a monotonic slope toward the narrow side, rather than simple holes through the flat side. This creates a more complex three-dimensional coding structure that increases the difficulty of unauthorized copying while maintaining a manageable number of coding positions
2Reliability
If the number of coding positions is increased to enhance security, then the available space on the key is exhausted, but if the number is limited, then security is reduced
Solution Approach 1:
The patent places coding recesses at specific locations including the edges of the key in addition to the flat sides. By utilizing the edge areas and creating recesses with monotonic slopes, the design maximizes the use of available key space while maintaining a practical number of coding positions that provide sufficient security without exhausting the key's physical dimensions
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 design increases the number of coding positions and complicates unauthorized copying by requiring accurate 3D shape reproduction or knowledge of the manufacturing process, while allowing for efficient production of the key using standard tools.
Implementation Method 1
a method for producing a key of the type described herein, wherein the coding recesses are created using a subtractive tool in the same operation as the coding holes
Data Source
Figure 1~3
Figure 4~7
Figure 8~9
AI summary
The flat key (1) has a key bow (11) and a key shaft (12) extending along a key axis (10) from the key bow (11) to a front key tip (23), with two parallel flat sides (21) and two opposing narrow sides (22). Between the flat sides and the narrow sides, an edge (25) parallel to the key axis (10) runs. At least one of the flat sides has a row of coding holes (31) parallel to the key axis. The key also has at least one coding recess (35) in at least one of the edges (25). This coding recess forms a flank (43) extending from the flat side to the narrow side, which has a monotonic slope.