Double Lock Cylinder Anti-Pull Design
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Solution Overview
Problem
Double lock cylinders with multi-part connecting devices lack sufficient protection against manipulation, particularly in terms of tensile loads, which can lead to failure under forceful attempts to remove or manipulate the cylinder.
Innovation Solution
A double lock cylinder design featuring a first subassembly with a higher tensile load capacity for the outside housing part and a second subassembly with a lower load capacity for the inside housing part, utilizing multi-pin and single-pin connections respectively, along with high-strength materials for the first subassembly and softer materials for the second, to provide enhanced anti-pulling protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-part connecting device is used to connect housing parts, then the axial dimensions can be adjusted by selecting connecting elements with suitable lengths, but the protection against manipulation, particularly against tensile loads, is insufficient
Solution Approach 1:
The connecting device is divided into two distinct subassemblies: a first subassembly (outside housing part + first connecting element) designed for high tensile load resistance, and a second subassembly (inside housing part + second connecting element) designed for modular assembly. This segmentation allows each subassembly to be optimized for its specific function, resolving the contradiction between adjustability and strength.
Solution Approach 2:
Different parts of the connecting device are given different properties: the first subassembly uses high-strength materials and multi-pin connections to resist tensile loads, while the second subassembly uses simpler materials and single-pin connections for easy assembly. This local differentiation allows the system to achieve both high strength where needed and ease of manufacture elsewhere.
2Strength
If high-strength materials and multi-pin connections are used throughout the connecting device, then protection against manipulation is increased, but manufacturing cost and complexity increase
Solution Approach 1:
High-strength materials and multi-pin connections are applied only to the first subassembly where they are needed for manipulation protection, while the second subassembly uses simpler, less expensive materials and single-pin connections. This localized application of high-strength features reduces overall manufacturing cost and complexity while maintaining necessary protection levels.
Solution Approach 2:
The connecting device is segmented into two subassemblies with different manufacturing requirements. The first subassembly is manufactured with high-strength features for external protection, while the second subassembly is manufactured with simpler features for internal assembly, allowing each to be optimized for its specific manufacturing constraints.
3Ease of operation
If screw connections are used in the first subassembly, then assembly is easier, but tensile load resistance is reduced
Solution Approach 1:
Instead of using screw connections in the first subassembly (which would ease assembly but reduce strength), the patent inverts the approach by using non-screw connections (such as press-fit or interference-fit connections) in the first subassembly to maximize tensile load resistance, while reserving screw connections for the second subassembly where ease of assembly is more important.
Data Source
Figure 1
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AI summary
The invention relates to a double locking cylinder (10) with a cylinder housing (12) and with a cylinder core (14), wherein the cylinder housing has an inner housing part (16) and an outer housing part (18), wherein the housing parts (16, 18) are connected to each other by means of a multi-part connecting device (20) extending parallel to the cylinder core, wherein the connecting device (20) has a fastening section (22) for a faceplate screw, wherein a first assembly (26) is provided which comprises the outer housing part (18) and a first connecting element (30) which is connected to the outer housing part (18) and carries the fastening section (22), wherein a second assembly (28) is provided which comprises the inner housing part (16) and at least one second connecting element (32) for connecting the first connecting element (30) to the inner housing part (16).and wherein the first assembly (26) and the second assembly (28) are designed such that the first assembly (26) can withstand higher tensile loads than the second assembly (28).