Reversible Key Asymmetrical Recesses Anti-Copying
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Solution Overview
Problem
Existing cylinder lock systems with reversible keys face challenges in providing extensive coding options with minimal manufacturing effort while preventing unauthorized copying, particularly due to limited variability in slot positions and increased production complexity.
Innovation Solution
Incorporating non-rotationally symmetrical recesses with arcuate bottom surfaces between rotationally symmetrical indentations on the key bit, allowing for additional pin-like tumblers with complementary tumbler tips, which enhance coding options without significant technological effort and complicate key copying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-rotationally symmetrical recesses with arcuate bottom surfaces are added to the key blade, then coding options are expanded and security is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent introduces non-rotationally symmetrical recesses with arcuate bottom surfaces between the rotationally symmetrical recesses on the key blade. This asymmetry creates additional coding possibilities that prevent unauthorized copying, as the combination of symmetrical and asymmetrical features requires precise matching of both types of recesses and their corresponding tumblers.
Solution Approach 2:
The key blade is segmented into multiple types of recesses: rotationally symmetrical recesses for standard pin tumblers and non-rotationally symmetrical recesses with arcuate bottom surfaces for specialized tumblers. This segmentation allows each type of recess to work with specific tumbler configurations, expanding the overall coding capacity while maintaining modular manufacturing approaches.
2Reliability
If non-rotationally symmetrical recesses are incorporated into the key blade, then key copying becomes more difficult, but manufacturing effort increases
Solution Approach 1:
The non-rotationally symmetrical recesses with arcuate bottom surfaces create a more secure locking system because they cannot be easily replicated without precise measurement and matching. The asymmetrical geometry requires custom tooling and careful manufacturing, but this very difficulty prevents unauthorized copying while maintaining standard manufacturing processes for the symmetrical portions.
Solution Approach 2:
Only specific portions of the key blade (certain recesses) require the complex non-rotationally symmetrical geometry with arcuate bottom surfaces, while other portions maintain standard rotationally symmetrical designs. This localized application of complexity allows secure coding in critical areas while keeping overall manufacturing feasible through standard processes for the remaining features.
3Adaptability or versatility
If additional pin-like tumblers with complementary tumbler tips are added to the locking cylinder, then coding possibilities are increased, but device complexity increases
Solution Approach 1:
The locking cylinder is divided into two distinct tumbler systems: classic pin tumblers for standard key recesses and additional pin-like tumblers with complementary tumbler tips for the non-rotationally symmetrical recesses. This segmentation allows each subsystem to be manufactured and assembled independently, managing complexity while achieving expanded coding capabilities through the combination of both systems.
Solution Approach 2:
The additional pin-like tumblers feature complementary tumbler tips that correspond to the non-rotationally symmetrical recesses. This asymmetrical design creates unique coding combinations that work only with specifically configured keys, increasing security and coding possibilities while maintaining a structured approach to tumbler arrangement and operation.
Data Source
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AI summary
The invention relates to a key, in particular a reversible key, for a cylinder-lock locking system, comprising a key head and a key bit, wherein the key bit has a plurality of rotationally symmetric recesses for receiving pin-like tumblers of a lock cylinder, wherein the pin-like tumblers are designed as a classic two-part series arrangement in the lock cylinder housing and in the cylinder core. According to the invention, the key bit is provided with a rotationally asymmetric cut-out in at least one spacing surface between the rotationally symmetric recesses, which cut-out consists of two side walls and a bottom, in particular a circular-arc-shaped bottom surface, which is bounded by the side walls, in order in this way to create a further key coding possibility and, by means of the combination of bored and milled codings, to impede unauthorized copying of the key.