Door Forced Entry Practice Device with Support Arms

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Solution Overview

Problem

Existing forced entry practice devices are bulky, expensive, and prone to damaging conventional doors and door frames, or they are not commercially viable due to detachment issues during use.

Innovation Solution

A forced entry practice device with a housing assembly installed in a door cutout, featuring support arms and a block with a resilient member, coupled with a casing for the door frame, allowing for easy installation and repeated use without damaging the door or frame, and utilizing retaining members to maintain the door in a closed position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a free-standing apparatus with rigid steel door frame is used, then forced entry practice can be performed, but the device becomes bulky, heavy, and expensive requiring separate area

Engineering Contradiction:

Improveforced entry practice capabilityVSAvoiddevice weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent creates a simplified copy of the forced entry practice function by installing a housing assembly with support arms and block mechanism directly onto existing conventional doors, eliminating the need for heavy free-standing steel door frame structures while maintaining the essential practice capability

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The device is designed to be universally applicable to conventional doors already in use, allowing forced entry practice on existing door infrastructure rather than requiring specialized heavy-duty standalone door assemblies

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a specialized latch system is installed on conventional door, then forced entry practice can be performed, but the door and door frame are prone to damage and device is prone to detachment

Engineering Contradiction:

Improveforced entry practice capabilityVSAvoiddamage to door and frame

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The support arms are designed to extend across the door surface and engage with the block mechanism to absorb and distribute impact forces from forced entry tools before they can damage the door structure or cause device detachment

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The block mechanism serves as an intermediary element between the support arms and the door, allowing the block to slide within the housing assembly and absorb forces while preventing direct transmission of damaging forces to the door and frame structure

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If conventional door is used for forced entry practice, then easy installation is achieved, but the door is prone to damage during use

Engineering Contradiction:

Improveinstallation easeVSAvoiddamage to door

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The housing assembly is pre-configured with support arms and block mechanism before installation on the door, allowing for easy mounting to conventional doors while the pre-positioned support structure is already prepared to distribute and absorb forces during forced entry practice

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The support arms act as intermediary structural elements between the housing assembly and the door, distributing applied forces across multiple contact points on the door surface to prevent localized damage while maintaining easy installation on conventional door structures

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The device provides a cost-effective, easy-to-install solution that minimizes damage to doors and frames, ensuring secure and repeated use by distributing force across the door's surface area, thus enhancing its strength and durability.

Implementation Method 1

A resilient member is disposed within the cavity, which biases the block toward its first position

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9181735B2Forced entry practice device for a door

Publication Date: 2015.11.10 TROXFIRE TRAINING SOLUTIONS

AI summary

A forced entry practice device for a door includes a housing assembly configured to be installed in a cutout of a door and defining a cavity. A support arm extends outwardly from a side portion of the housing assembly and across a major surface of the door. A casing is coupleable to a door jamb of a door frame associated with the door. A first engagement portion is coupled to the casing, and a second engagement portion is coupled to the housing assembly. A retaining member includes a first section receivable in the first engagement portion and a second section receivable in the second engagement portion. The edge of the door is maintained proximate to the door jamb when the retaining member is received in the engagement portions.