Vented Upper Receiver Gas Relief Design

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Solution Overview

Problem

Existing firearms, particularly those using a gas blowback system like the AR-15, experience unwanted back pressure within the upper receiver, which can cause hot exhaust gases and unburned powder to be blown into the user's face, potentially causing injury, and existing solutions like specialized charging handles are either ineffective or introduce additional problems.

Innovation Solution

A pressure-reducing upper receiver design featuring vent apertures in the forward assist cover and adjustable gas relief valves to direct and regulate the escape of gases, allowing for customizable venting to prevent back pressure from reaching the user's face.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If gas blowback system is used to operate the firearm, then the firearm can function reliably with standard ammunition, but back pressure builds within the upper receiver cavity causing hot exhaust gases and unburned powder to be blown into the user's face

Engineering Contradiction:

Improvefirearm operation reliabilityVSAvoidhot exhaust gases and unburned powder exposure to user

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the harmful back pressure and exhaust gases from the upper receiver cavity by introducing vent apertures that provide a controlled escape path for the gases, separating the harmful exhaust flow from the user's face while maintaining the gas blowback operation

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The vent apertures act as an intermediary element between the upper receiver cavity and the external environment, allowing controlled release of exhaust gases through a designated path that prevents direct exposure to the user while maintaining system pressure balance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If specialized charging handle is used to direct escaping gases away from user's face, then gas direction can be controlled, but the solution is ineffective for left-handed users and can introduce additional problems into the firearm platform

Engineering Contradiction:

Improveexhaust gas direction controlVSAvoideffectiveness for different user configurations

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The vent apertures provide a universal solution that works for all users regardless of handedness, as the venting occurs through fixed apertures in the upper receiver rather than through a directional charging handle mechanism that would need to be reconfigured for different users

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Stress or pressure

If stronger recoil spring and heavier buffer are used to combat back pressure, then back pressure can be increased, but this introduces more problems into the firearm platform and negatively affects reliability

Engineering Contradiction:

Improveback pressure controlVSAvoidfirearm platform reliability

Core Design Contradiction:

Stress or pressureVSReliability

Solution Approach 1:

The patent converts the harmful back pressure into a beneficial controlled venting process by providing apertures that allow the pressure to escape in a controlled manner, transforming the problematic high pressure condition into a manageable flow that protects the user while maintaining reliable operation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Effectively reduces or eliminates back pressure within the upper receiver, preventing damage from hot gases and debris while maintaining firearm operability and allowing user control over gas venting to ensure safety and reliability.

Implementation Method 1

gas pressure (back pressure) builds within the cavity of the upper receiver... this back pressure escapes from the receiver through the charging handle aperture

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

gas from the burning propellant forces the bullet through the barrel... gas enters a gas port... directs gas through a portion of the front sight and into the gas tube, which directs the gas into a cylinder between the bolt carrier and the bolt and drives the bolt carrier rearward

Methodology Applied

Scientific EffectGas pressure: Pressure Gradient

Data Source

PatentUS8910406B1Vented upper receiver for a firearm

Publication Date: 2014.12.16 HUANG GEORGE

AI summary

An pressure reducing component for a firearm that includes one or more vent apertures formed through a side wall or the forward assist cover of an upper receiver. The vent aperture(s) may be completely open to allow gases to be vented from within the upper receiver or may be adjusted to allow a desired amount of gas to be vented from within the upper receiver.