Key Shaft Stabilizing Insert for Copy Security
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Solution Overview
Problem
Existing keys and locking systems face challenges in maintaining high security due to high maintenance efforts and material usage, as well as vulnerability to modern copying methods, which compromise the desired security for end-users.
Innovation Solution
A key design featuring a stabilizing insert with a channel for a displaceable rolling element that increases copy security by simulating key contours but not kinematics, making mechanical scanning difficult, while also reducing material thickness and enhancing the key shaft's strength, thereby improving copy protection and material efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional key design is used, then the key shaft has sufficient strength, but the copy security is low and material usage is high
Solution Approach 1:
The key shaft is segmented into a base key shaft and a separate stabilizing insert. The stabilizing insert contains the channel for the rolling element and is inserted into a passage in the key shaft, creating a composite structure that provides both strength and security features while using less material overall.
Solution Approach 2:
The key shaft combines two different materials: the base key shaft material and the stabilizing insert material (which has higher strength). This composite structure allows the key to achieve both copy protection through the rolling element mechanism and structural strength while reducing overall material usage.
2Strength
If the key shaft is made thicker to increase strength, then the key shaft stability improves, but the locking channel cross section must be larger
Solution Approach 1:
The stabilizing insert is inserted into a passage in the key shaft, concentrating the strengthening function in a specific region rather than requiring the entire key shaft to be thicker. This allows the locking channel to maintain a smaller cross section while the key shaft achieves sufficient strength through the insert.
Solution Approach 2:
The stabilizing insert provides localized strengthening where needed (in the region containing the channel for the rolling element) rather than uniformly thickening the entire key shaft. This allows for a more efficient design where material is concentrated in critical areas.
3Manufacturing precision
If modern copying methods are used, then key contours can be reproduced precisely, but the kinematics of moving elements cannot be recognized
Solution Approach 1:
The key incorporates a rolling element that can move freely in a channel, creating a dynamic feature that cannot be captured by static copying methods. The rolling element's movement along the channel and interaction with the locking cylinder's stop element creates kinematic behavior that 3D scanning and printing cannot reproduce.
Solution Approach 2:
The rolling element acts as an intermediary between the key shaft and the locking cylinder's stop element. This intermediate moving component creates a mechanical interaction that cannot be directly observed or copied from the key's external contour, providing inherent copy protection.
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 solution enhances copy protection and reduces the risk of damage to the key shaft, allows for a smaller locking channel design, and makes manipulations or attacks more difficult, while maintaining stability and security without weakening the key shaft.
Implementation Method 1
a channel is formed in the stabilizing insert 22 in which a displaceable along the channel rolling element 26 for actuating a side tumbler (134) of a locking cylinder (102) is arranged
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A key (10) for operating a locking cylinder (102), comprising a key bow (12) and a key shaft (16) extending from the key bow (12), is designed and further developed to enable safe and reliable operation using simple constructional means, such that the key shaft (16) has a stabilizing insert (22) which has a higher strength than the material of the key shaft (16), and that a channel (24) is formed in the stabilizing insert (22) in which a rolling element (26) is arranged that is displaceable along the channel (24) for operating a lateral tumbler (134) of a locking cylinder (102). A locking system (100) with such a key (10) and an associated locking cylinder (102), as well as a method for manufacturing such a key (10), are specified.