Locking Cylinder Beveled Edge Coding

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Solution Overview

Problem

Existing lock devices are prone to being forced open due to their large size and ease of manipulation with picking tools, as they rely on standard coding that can be easily replicated, limiting the range of variation and increasing dimensions.

Innovation Solution

Incorporating beveled coding in corner regions of the key edge profile with variable bevel cuts, allowing for increased variation in tumblers' positions and scanning directions, making it difficult for unauthorized access without increasing the lock's size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the length or width of the key is increased to increase the range of variation for coding, then the number of tumblers that can be positioned in the cylinder core is increased, but the overall height or overall length of the lock device is increased

Engineering Contradiction:
Improverange of variation for codingVSAvoidoverall length of lock device
Core Design Contradiction:
Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The patent introduces beveled coding in corner regions of the key, adding a new dimensional aspect to the coding system. Instead of only extending coding along the length or width of the key, the beveled corners create additional scanning points in a different spatial dimension, allowing increased coding variation without increasing the key's overall dimensions or the lock device's height/length.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If the number of tumblers is increased to increase the range of variation for coding, then the coding complexity is increased, but the lock device becomes more susceptible to forcing open with picking tools

Engineering Contradiction:
Improverange of variation for codingVSAvoidresistance to forcing open
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The patent employs asymmetric beveled coding in the corner regions of the key, where the bevels are positioned and oriented in non-symmetric patterns. This creates asymmetric scanning points that do not follow conventional symmetric coding patterns, making the lock more resistant to picking tools that rely on recognizing and manipulating symmetric code structures. The asymmetric beveled tumblers配合 with asymmetric key coding creates a more secure locking mechanism.

Inventive Principle:
Principle #4Asymmetry

3Adaptability or versatility

If the cross section of the key bit is increased to accommodate more tumblers, then the coding capacity is increased, but the lock device dimensions are increased

Engineering Contradiction:
Improvecoding capacityVSAvoidcross section of key bit
Core Design Contradiction:
Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent nests the beveled coding structure within the existing corner regions of the key bit, utilizing the available space efficiently. The beveled tumblers are positioned within the cylinder core to engage with the beveled coding in the corner regions, allowing additional coding capacity to be nested within the existing key cross-section rather than requiring an expanded cross-section. This nesting approach increases coding capacity while maintaining compact key dimensions.

Inventive Principle:
Principle #7Nested doll (Nesting)

Data Source

PatentUS7690232B2Locking device with a locking cylinder and a key
Publication Date: 2010.04.06 HUF HÜLSBECK & FÜRST GMBH & CO KG
  • US7690232B2 patent drawing
  • US7690232B2 patent drawing
  • US7690232B2 patent drawing

AI summary

A locking device having a locking cylinder and a key. The locking cylinder includes a cylinder core with tumblers in a cylinder core, which is rotatably mounted in a cylinder housing. Standard coding for the key is produced by a step with longitudinal profiling on at least one flat side of the edge profile of the key, said step being associated with a counter step on the tumbler. In addition to the standard coding produced by step and counter step, the key has at least one set of beveled edge coding in a corner section of the edge profile. The beveled edged coding consists of recesses in the form of beveled cuts in the corresponding corner sections of the edge profile, relative to which are provided counter touching points in the corresponding tumbler. In a section of the key shaft, either the standard coding or beveled edge coding can optionally be used, thereby considerably increasing the diversity of the locking device while retaining the space-saving design.