Door Security Device with Segmented Rigid Member

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing door security measures, such as nylon straps and clamps, are inadequate for preventing unauthorized access to hotel safes as they can be easily cut or dislodged, and are cumbersome to use and install.

Innovation Solution

A door security device featuring an elongated flat rigid member with segments and blocking members, secured by a supplemental restraining device like a padlock, which engages with the door frame to prevent opening from one side, utilizing ratcheting mechanisms and flanges for stability and alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If nylon straps are used to secure a door, then the device is simple and easy to apply, but the security is insufficient as the straps can be easily cut

Engineering Contradiction:

Improveease of applicationVSAvoidsecurity against cutting

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The rigid member is divided into multiple segments (first segment, second segment, transition segment) connected at angles, creating a structured framework that distributes force and prevents cutting while maintaining ease of application

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The device combines a rigid member (metal or rigid plastic) with a supplemental restraining device (padlock or cable lock), creating a composite security system that resists cutting while remaining simple to apply

Inventive Principle:

Principle #40Composite materials

2Reliability

If clamps are used to secure a door, then the security is improved, but the device becomes heavy and cumbersome to carry and install

Engineering Contradiction:

Improvesecurity against dislodgingVSAvoidweight of security device

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The device uses a thin, flat rigid member that is lightweight yet structurally sound, with blocking members that engage into the door frame rather than requiring heavy clamping force

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The blocking members extract and utilize the existing door frame structure for support, eliminating the need for heavy clamps by leveraging the building's infrastructure

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If clamps are used to secure a door, then the security is improved, but the device becomes susceptible to being dislodged

Engineering Contradiction:

Improvesecurity against cuttingVSAvoidresistance to dislodging

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The blocking members are pre-configured with blocking surfaces that engage into the door frame structure, creating preliminary mechanical interlocking that prevents dislodging before any force is applied

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The device allows for dynamic adjustment through the supplemental restraining device that can be locked at different positions along the rigid member, adapting to different door configurations while maintaining stability

Inventive Principle:

Principle #15Dynamics

4Reliability

If a robust security device is used, then the resistance to tampering is improved, but the device complexity increases

Engineering Contradiction:

Improveresistance to tamperingVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The rigid member serves multiple functions: it provides the structural framework, holds the blocking members, accommodates the supplemental restraining device, and engages with the door frame, reducing overall complexity through functional integration

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of making the entire device complex and locked, the invention inverts the approach by making the device simple and open, requiring the user to add their own supplemental restraining device, thereby simplifying the device structure while maintaining security

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS10961747B1Device for securing a door

Publication Date: 2021.03.30 GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE DIRECTOR NAT SECURITY AGENCY

AI summary

A device for securing a door includes an elongated flat rigid member. A first segment is connected to a second segment by a transition segment perpendicular to the first and second segments. The first segment forms an aperture to admit a restraining device. The device also includes a first blocking member having two apertures and configured to engage the first member such that the restraining device restrains the first blocking member relative to the flat rigid member. The device also includes a second blocking member configured to lockably engage the second segment, thereby securing the device relative to a frame of the door with the first and second segments on opposite sides of the frame. When the device is secured and the door closed, and the first blocking member restrained relative to the flat rigid member, the door is blocked from being opened by the first and second blocking members.