Polygonal Slip Hinge Geometry to Prevent Tool Grip
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Solution Overview
Problem
Conventional hinges in security screen systems are prone to deterioration, bending, or breaking, and can be easily manipulated or damaged by hand tools, compromising security and allowing unauthorized access.
Innovation Solution
The development of slip hinges with polygonal or triangular cross-sections that prevent vice grips or hand tools from gaining a sufficient grip, featuring base and rotating members with non-parallel sides that are oriented to expose only one vertex in the closed position, making it difficult for tools to exert breaking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional barrel-shaped hinges are used in security screen systems, then the hinges allow doors or windows to swing outwardly or inwardly, but the hinges are subject to manipulation and damage by hand tools such as vice grips, wrenches, and pliers
Solution Approach 1:
The hinge portion is formed with a non-circular cross-section having at least one non-parallel side, creating an asymmetric shape that prevents hand tools from gaining sufficient grip. This asymmetric geometry ensures that tools like vice grips, wrenches, and pliers cannot effectively manipulate the hinge, thereby resisting vandalism while maintaining structural integrity
Solution Approach 2:
The invention replaces the conventional cylindrical hinge shape with a polygonal cross-section that has curved surfaces. The non-parallel sides and rounded corners create a geometry that is difficult for tools to grip, while the curved surfaces maintain smooth aesthetics and structural strength. This curved polygonal shape prevents tool engagement without compromising the hinge's mechanical properties
2Object-affected harmful factors
If hinges with non-parallel sides and exposed vertices are used, then resistance to tool manipulation is improved, but the complexity of hinge design increases
Solution Approach 1:
The hinge employs local quality by applying the non-parallel side configuration specifically to the portion subjected to potential tool manipulation, while other portions of the hinge maintain conventional geometries. This localized application of asymmetric geometry provides anti-vandalism protection where needed without unnecessarily complicating the entire hinge structure
Solution Approach 2:
The invention changes the geometric parameters of the hinge cross-section from circular to polygonal with non-parallel sides. This parameter change fundamentally alters the tool-grip characteristics while maintaining manufacturing feasibility through standard fabrication processes, balancing security enhancement with design simplicity
Data Source
AI summary
There is provided a hinge system and/or a slip hinge. The system may include a door or window having a sash and a slip hinge. The slip hinge may include: a pin; a base member including a first mounting plate and a first hinge portion, the first mounting plate engaging a frame defining an opening receiving the door or window, and the first hinge portion having a first recess to receive the pin; and a rotating member including a second mounting plate and a second hinge portion, the second mounting plate engaging the sash and the second hinge portion having a second recess to receive the pin; wherein a cross-section of at least one of the first and second hinge portions is substantially polygonal in shape with at least two sides that are not parallel to one another. There is also provided a method of installing a slip hinge.