Security Door Astragal Gap Coverage

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Solution Overview

Problem

Conventional security door systems are vulnerable to forced entry methods, such as using crowbars, as they allow gaps that can be exploited to pry the door open, lacking effective coverage to prevent unauthorized access.

Innovation Solution

A security door system incorporating an astragal with a vertically extending plate that covers the gap between the door and the frame, and a horizontally extending plate that enhances the reaction force and bending moment, preventing tools from being inserted to pry the door open, secured via one-way fasteners for added security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional security door system is used, then the door can be installed in the door frame, but gaps are created between the door edge and the frame that allow crowbars to be inserted for prying the door open

Engineering Contradiction:

Improvesecurity against forced entryVSAvoidvulnerability to crowbar attacks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The astragal adds a third dimensional element (protruding plate) to the traditional door assembly, creating an additional protective dimension that prevents tools from reaching the gap between door and frame

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The astragal acts as an intermediary component between the door and the door frame, blocking the harmful interaction (crowbar insertion) without requiring changes to the door or frame themselves

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the astragal is secured to the door using conventional fasteners, then the astragal can be attached, but the fasteners can be easily removed compromising security

Engineering Contradiction:

Improvesimplicity of astragal installationVSAvoidpermanent attachment security

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The fasteners change their attachment parameter from reversible (screws, bolts) to permanent (one-way set fasteners), ensuring the astragal cannot be removed while maintaining installation simplicity through proper fastener selection

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11319746B2Security door system

Publication Date: 2022.05.03 DETROIT GLASS & DOOR LLC

AI summary

A security door system includes a door frame, a door, and an astragal. The door frame has first and second vertically extending side members that define an opening therebetween. The door is disposed within the opening and is secured to the frame via a hinged connection along the first vertically extending side member. A gap is defined between an edge of the door, that is opposite the hinged connection, and the second vertically extending side member when the door is in a closed position. The astragal has first and second plates that are secured to an outer surface of the door. The first plate extends beyond the edge such that the first plate covers the gap when the door is in the closed position. The second plate extends from the first plate in a direction away from the edge and toward the hinged connection.