Portable Hinge Guard with Adjustable Gap for Secure Door Access

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Solution Overview

Problem

Conventional door guards are either fixed, bulky, or lack the ability to securely open a door while allowing a gap for communication, making them vulnerable to tampering and unable to provide a portable, reusable security solution for various settings.

Innovation Solution

A portable door guard apparatus that slides over a door hinge, featuring a hollow cylindrical section with a 'C' shaped profile, movable back face sections, and adjusting means to secure the door from opening beyond a set limit, allowing for secure communication through a controlled gap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional door guards are fixed onto the door and door frame, then security is provided, but the device becomes bulky and not portable

Engineering Contradiction:

ImprovesecurityVSAvoidportability

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The door guard is divided into two separate wings that attach to different surfaces (door and door frame), allowing the device to be compact and portable while still providing secure anchoring when deployed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door guard transitions from a two-dimensional flat bar to a three-dimensional structure with wings that extend in multiple directions, enabling portable storage while maintaining security function when installed

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If conventional door guards allow the door to open with a gap, then communication is enabled, but the security buffer is reduced

Engineering Contradiction:

Improvecommunication capabilityVSAvoidsecurity buffer

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The door guard incorporates movable back face sections that can dynamically adjust their position to control the opening gap, allowing communication when needed while maintaining security buffer when closed

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The device changes the parameter of gap size by allowing the back face sections to move, enabling the user to adjust between communication mode (larger gap) and security mode (smaller or no gap)

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If conventional door guards are made portable, then mobility is improved, but they lack the feature to securely open the door with a controlled gap

Engineering Contradiction:

ImproveportabilityVSAvoidgap control capability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The movable back face sections provide dynamic adjustment capability that enables portable door guards to control the opening gap, combining portability with gap control functionality

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The door guard design incorporates multiple functions in a single portable device: security anchoring, gap control, and communication enabling, making it versatile for various situations

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9670706B2Portable door guard hinge security device

Publication Date: 2017.06.06 CHING HENRY KONG SUN

AI summary

A portable door guard used to secure the door at the hinge, particularly the wings of the hinge. The portable door guard comprises a retractable, non-permanently fixed device that can be secured around the hinge of the door from the inside to prohibit the door to open more than a gap. The portable door guard includes a center area designed to grip the hinge to limit the swinging movement of the hinge and adjusting means to configure the size of the gap.