Euro Profile Cylinder Lock Snapping Resistance Design
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Solution Overview
Problem
Euro profile cylinder locks are prone to snapping and vulnerable to 'bumping' attacks due to their design, which compromises their strength and security.
Innovation Solution
A new lock design featuring a top section, a middle section with a width less than the top section, and a lower section with a greater width than the middle section, increasing the cross-sectional area and resistance to snapping, combined with a casement lock that can accommodate either standard or high-security cylinder locks for enhanced flexibility and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixing hole is provided in the central section of the Euro profile cylinder, then the lock can be installed and fixed, but the strength and resistance to snapping is severely compromised
Solution Approach 1:
The patent introduces a third dimension by extending the lower section downward from the middle section, creating a bridge structure that spans the cam opening. This vertical extension provides additional material volume and structural support below the cam, compensating for the strength reduction caused by the fixing hole in the middle section while maintaining the necessary installation features.
Solution Approach 2:
The lock cylinder is constructed as a composite structure with three distinct sections (top, middle, and lower) made from different materials or with different structural properties. The lower section extends downward to provide enhanced strength and acts as a bridge across the cam opening, while the middle section contains the fixing hole for installation. This composite design allows each section to optimize for its specific function.
2Strength
If the lower section width is increased to prevent snapping, then the resistance to snapping improves, but the compatibility with standard casement locks may be reduced
Solution Approach 1:
The lock cylinder design incorporates a lower section that extends downward to provide enhanced strength and bridge the cam opening, while the overall profile is designed to maintain compatibility with standard casement lock mechanisms. The top section and middle section dimensions are maintained to ensure universal fit, while only the lower portion is modified for strength enhancement.
3Shape
If the bridge of material above and below the fixing hole is minimized, then the lock profile remains compact, but the lock becomes vulnerable to snapping under angular load
Solution Approach 1:
Instead of adding material horizontally in the middle section (which would compromise the compact profile), the patent extends the lower section vertically downward to create a bridge structure. This vertical extension provides additional material volume and structural support below the cam opening without increasing the horizontal footprint, thus maintaining the compact profile while significantly improving resistance to snapping under angular load.
Data Source
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Figure 3
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AI summary
A double cylinder lock 102 having a top section 108 comprising a first and second barrels with rotatable cores separated by a rotatable cam 106, a middle section 134 extending from the top section having a smaller width than the top section and a lower section 104 extending from the middle section and bridging the gap left by the cam opening; the lower section having a larger width than the narrower middle section. Preferably the lower section has a width equal to the top section. Also claimed is a casement lock having a casing with profiled aperture to match the cylinder lock. The increased thickness of the bottom of the lower strengthens the cylinder around making it harder to snap the cylinder about a hole 12 that may be provided for securing it in place.