Portable Door Barricade with Interference Fit Retainer

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Solution Overview

Problem

Existing door security systems are inadequate for rapid deployment and effective resistance against forced entry in emergency situations, as they are often cumbersome, costly to upgrade, and lack features for efficient egress during life-threatening encounters.

Innovation Solution

A portable emergency door barricade apparatus with a protuberance and keeper system that can be quickly secured and decoupled using a retainer, allowing for efficient barricading and emergency egress, featuring adjustable indexing features and a backlash cam for secure attachment and easy removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If passage locksets are installed to provide robust security, then resistance to forced entry is improved, but cost increases and complexity of installation increases

Engineering Contradiction:

Improveresistance to forced entryVSAvoidcomplexity of installation

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The door barricade device is divided into separate modular components including a barricade body, indexing features, and attachment mechanisms that can be independently manufactured and assembled, reducing installation complexity while maintaining security strength

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary barricade device that interfaces between the door and the intruder, using indexing features and attachment mechanisms as mediators to transfer and distribute forces, thereby reducing the complexity burden on the lockset itself

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If keyed locksets are used to provide access control, then security against unauthorized entry is improved, but vulnerability to electronic key card bypass increases

Engineering Contradiction:

Improvesecurity against unauthorized entryVSAvoidvulnerability to electronic key card bypass

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates a physical copy or alternative access control mechanism in the form of a mechanical barricade that operates independently of electronic systems, providing a redundant security layer that cannot be bypassed by electronic key cards

Inventive Principle:

Principle #26Copying

Solution Approach 2:

Instead of relying on electronic authentication systems that can be compromised, the patent inverts the approach by using a passive mechanical barricade system that physically blocks access regardless of electronic authentication status

Inventive Principle:

Principle #13The other way round (Inversion)

3Strength

If furniture is used as a barricade in emergency situations, then resistance to forced entry is improved, but deployment time increases and ease of operation deteriorates

Engineering Contradiction:

Improveresistance to forced entryVSAvoidease of deployment

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent extracts the essential barricade function from bulky furniture and consolidates it into a compact, dedicated device that provides equivalent or superior resistance to forced entry while being much easier to deploy rapidly in emergency situations

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The barricade device incorporates dynamic elements such as movable components and adjustable features that allow for rapid deployment and adaptation to different door configurations, improving ease of operation while maintaining structural strength

Inventive Principle:

Principle #15Dynamics

4Strength

If robust locksets are installed to prevent forced entry, then security is improved, but ease of egress during emergencies deteriorates

Engineering Contradiction:

Improvesecurity against forced entryVSAvoidease of egress

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The barricade device is pre-configured with indexing features and attachment mechanisms that enable rapid deployment by the occupant, and includes predetermined release mechanisms that allow for equally rapid egress when needed, balancing security with emergency accessibility

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies different functional qualities to different parts of the barricade system - the attachment mechanisms provide secure engagement for normal operation, while the release mechanisms provide easy disengagement for emergencies, with each local feature optimized for its specific function

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11970889B2Outward swinging door barricade

Publication Date: 2024.04.30 THE GOVERNMENT OF THE UNITED STATES AS REPRSENTED BY THE SECRETARY OF THE AIR FORCE

AI summary

The emergency egress apparatus includes a protuberance mated to a first portion of the door barricade and a keeper mated to a second portion of the door barricade. A retainer is selectively disposed between one of two positions. A first position defines the placement of the retainer that establishes an interference fit between the protuberance and the keeper. A second position defines the placement of the retainer such that it is not in contact with the protuberance or the keeper. The first position secures the first portion of the door barricaded with respect to the second portion of the door barricade, and the second position decouples the first portion of the door barricade with respect to the second portion of the door barricade.