Lock Cylinder Plug Securing Member Anti-Removal Design
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Solution Overview
Problem
Existing lock devices are vulnerable to manipulation when a strong axial force is applied to the cylinder plug, as the securing member can be radially deformed, allowing the cylinder plug to be removed from the cylinder house.
Innovation Solution
The securing member is partially arranged inside the cylinder house, with a radially projecting flange that bears against the cylinder house's outer wall, preventing radial expansion and allowing the cylinder house to counteract axial forces, and a threaded engagement with the cylinder plug to secure it in place without modifying existing cylinder house designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the securing member is arranged on the protruding end of the cylinder plug, then the cylinder plug can be secured in the cylinder house, but the securing member may be radially deformed by expansion when axial force is applied, allowing the cylinder plug to be removed
Solution Approach 1:
The securing member is moved from the protruding end (external dimension) to the interior of the cylinder house (internal dimension). This dimensional relocation allows the securing member to be constrained by the cylinder house walls, preventing radial expansion and deformation when axial force is applied during manipulation attempts.
Solution Approach 2:
The securing member is nested within the cylinder house, with its first portion received inside the cylinder house and the flange bearing against the outer wall. This nesting arrangement allows the cylinder house to counteract radial expansion of the securing member while maintaining a compact structure.
2Reliability
If the securing member is moved inside the cylinder house, then security against manipulation is improved, but the cylinder house structure would need to be modified
Solution Approach 1:
The flange of the securing member serves multiple functions: it bears against the outer wall of the cylinder house to prevent radial expansion, and its larger cross-sectional dimension prevents it from being received in the through-opening, thereby preventing removal from the front. This multi-functional design allows existing cylinder house designs to be used without modification.
3Reliability
If the flange cross-sectional dimension is greater than the through-opening dimension, then the cylinder plug cannot be removed from the front, but the securing member cannot be fully received in the through-opening
Solution Approach 1:
The securing member is divided into two distinct portions: a first portion with threaded engagement that is received inside the cylinder house, and a flange with larger cross-sectional dimension that bears against the outer wall. This segmentation allows each portion to serve its specific function - the first portion provides secure mounting while the flange prevents removal.
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
This design enhances security by preventing the cylinder plug from being removed via the front and reduces the risk of relative rotation between the cylinder plug and securing member, thereby improving the lock's reliability and resistance to manipulation.
Implementation Method 1
The cylinder plug has a first end portion comprising a threaded outer peripheral surface, and a securing member with a through-opening, which securing member has a first portion where the peripheral surface of the through-opening is threaded for engagement with the threaded outer peripheral surface of the first end portion
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a lock device (1). The lock device (1) comprises a cylinder house (3) with a through-opening (15). The lock device (1) further comprises a cylinder plug (5), which can be received in the through-opening (15) and serves for rotatable engagement with the cylinder house (3), which cylinder plug (5) has a first end portion (5-1) comprising a threaded outer peripheral surface, a securing member (9) with a through-opening, which securing member (9) has a first portion (9-1) where the peripheral surface of the through-opening is threaded for engagement with the threaded outer peripheral surface of the first end portion (5-1), and a flange (9-2) which has a cross- sectional dimension d6 greater than a cross-sectional dimension d4 of the through-opening (15). The first portion (9-1) of the securing member (9) is designed to be received in the through-opening (15) of the cylinder house (3), with the flange (9-2) bearing against an outer wall (14-2) of the cylinder house (3).