Security Door Hinge with Intermediate Brackets to Resist Flexing

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Solution Overview

Problem

Existing security door hinges are vulnerable to flexing and warping, which can compromise the structural integrity of the door and allow unauthorized entry into security containers.

Innovation Solution

A security door mounting arrangement that includes an elongate member extending along the first closure edge, rotatably mounted to and captured between spaced brackets, and a reinforcing member fixedly attached to the internal surface of the door to resist flexing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If an elongate rod is used as a hinge without intermediate support, then the door can rotate freely, but the rod is vulnerable to flexing and warping under leverage attacks

Engineering Contradiction:
Improvedoor rotationVSAvoidresistance to flexing
Core Design Contradiction:
Ease of operationVSStrength

Solution Approach 1:

The hinge rod is divided into multiple segments by introducing intermediate support brackets at spaced intervals along its length. These brackets segment the continuous rod into shorter spans, reducing the flexing vulnerability of each segment while maintaining overall rotational functionality.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Intermediate support brackets are introduced as intermediary elements between the door and the hinge rod. These brackets provide additional support points that prevent the rod from flexing under leverage attacks, while still allowing the door to rotate freely around the hinge axis.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Strength

If the elongate rod is made of substantial width and strength to resist flexing, then structural integrity improves, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:
Improveresistance to flexingVSAvoidhinge structure
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

Rather than making the entire hinge rod substantially wider and stronger, the rod is segmented into shorter spans using intermediate brackets. This allows the use of a standard-diameter rod throughout, avoiding the need to manufacture and install larger, more complex rod sections.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Instead of uniformly increasing the rod's dimensions along its entire length, intermediate support brackets are strategically placed at locations where flexing is most likely to occur during a leverage attack. This provides local reinforcement exactly where needed, without adding unnecessary complexity elsewhere.

Inventive Principle:
Principle #3Local quality

3Strength

If intermediate support is added to the hinge rod, then resistance to flexing improves, but the device complexity and number of components increase

Engineering Contradiction:
Improveresistance to flexingVSAvoidnumber of components
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The hinge system is segmented into manageable sections by adding intermediate brackets at optimized intervals. This segmentation provides structural reinforcement while keeping each individual component simple and the overall assembly straightforward.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Simple intermediate support brackets are introduced as intermediary components that connect the hinge rod to the door or frame. These brackets provide the necessary structural support with minimal added complexity, using straightforward attachment methods.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS12297679B2Security door mounting arrangement
Publication Date: 2025.05.13 LOKAWAY PTY LTD
  • US12297679B2 patent drawing
  • US12297679B2 patent drawing
  • US12297679B2 patent drawing

AI summary

A security door mounting arrangement for a safe (10) including a substantially rectangular-shaped block for the body (20), having a base (22), a rear wall (in the direction (23), a pair of side walls (24) and a top (25), all defining the cavity (21), and an opening (in the direction (26)) defined by a door jamb (27). A hinged door (40) includes a locking assembly (60), including a crank assembly (62). The crank assembly (62) includes a central crank (63) comprising a disc plate substantially parallel-planar with a main panel of the door (40). The crank (63) is operable by a handle installed on the front face of the door (40). The handle and the central crank are rotatable together coaxially and about a common axis A.