Cylinder Lock Bar Member Lateral Force Resistance
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Solution Overview
Problem
Conventional cylinder locks in double-glazing window and door units are vulnerable to lateral forces, which can cause the lock barrel to break, leading to a failure in security and potential unauthorized entry.
Innovation Solution
Incorporation of a bar member securely mounted within recesses in the locks, with sleeve members and collars that minimize lateral movement, providing additional resistance to breaking forces, and using high tensile materials like steel for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mounting hole is provided in the centre of the outward section of the barrel for easy and secure mounting, then the lock can be easily mounted, but the lock barrel becomes vulnerable to lateral forces and can be broken about the hole
Solution Approach 1:
The locking arrangement is divided into separate components: two locks (7) positioned at either end of the through passage (3), and a separate bar member (12) that connects them. This segmentation allows the mounting hole (23) to be provided in the outward section (4) for ease of installation, while the bar member (12) spanning between the locks provides the necessary structural reinforcement to resist lateral forces attempting to break the barrel about the mounting hole.
2Ease of operation
If the lock allows lateral movement of the two locks in the through passage for operation, then the lock can be operated easily, but the lock becomes vulnerable to breaking forces
Solution Approach 1:
The bar member (12) acts as an intermediary element between the two locks (7). It is positioned in the through passage (3) with each end located in a recess (10) of the respective lock, providing a connecting structure that reinforces the assembly against lateral breaking forces while still permitting the necessary operational movement of the locks relative to each other.
3Strength
If the bar member is securely mounted in recesses with interference fit, then resistance to lateral forces is maximized, but manufacturing precision requirements increase
Solution Approach 1:
The bar member (12) and recesses (10) are designed with specific dimensional parameters to create an interference fit or tolerance fit relationship. By carefully controlling the size and tolerance parameters of these components, the design achieves maximum resistance to lateral forces through the secure fit, while the parameters are set to be achievable with standard manufacturing capabilities.
Data Source
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AI summary
A cylinder lock (1) for use in a locking arrangement which comprises a barrel having a through passage (3), two locks (7) provided one at each end of the through passage (3) and a cam member (6) located between the locks (7) wherein the two locks are interconnected by a solid single bar member (12) and two sleeve members (13,14) located about respective ends of the bar member which are activated by the lock to operate the cam member (6) in the normal manner.