Firearm Bolt and Gas System Upgrades for Heat and Leakage Control

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Solution Overview

Problem

The M16 and M4 firearms experience reliability issues due to gas leakage, overheating, and increased cyclic rates, leading to potential malfunctions and safety concerns, particularly with higher capacity magazines and sustained fully automatic fire.

Innovation Solution

The implementation of extended locking lugs, keyed piston rings, a heat dissipating gas tube, and a gas metering plug to mitigate gas leakage, reduce overheating, and control gas flow, along with a double cut cam and anti-bounce weight to stabilize the bolt carrier and delay unlocking, enhancing the firearm's robustness and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If contemporary piston rings with gaps are used to seal the piston-cylinder interface, then the rings can be installed and apply outward spring force, but hot gases flow through the gaps causing gas leakage and reducing extraction force

Engineering Contradiction:

Improvegas seal effectivenessVSAvoidgas leakage through ring gaps

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful effect of hot gas flow through ring gaps into a beneficial sealing mechanism. The hot gas flow is used to heat and expand the rings in-place, causing them to tighten and seal against the piston surface, thereby eliminating gas leakage through the gaps.

Inventive Principle:

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

Solution Approach 2:

The patent changes the temperature parameter of the piston rings from ambient to elevated by exposing them to hot gas flow. This temperature change causes thermal expansion of the rings, increasing their outer diameter and improving the seal between the rings and the piston-cylinder interface.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the gas tube is used to deliver hot gas during sustained fully automatic fire, then gas delivery is maintained, but the gas tube overheats and loses strength causing thermal expansion and potential bending

Engineering Contradiction:

Improvesustained fire capabilityVSAvoidgas tube overheating

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent converts the harmful overheating effect into a beneficial sealing mechanism. The hot gas flow that would otherwise damage the gas tube is directed through or around piston rings, using the heat to expand and seal the rings against the piston, while the gas tube design accommodates thermal expansion.

Inventive Principle:

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

Solution Approach 2:

The patent utilizes thermal expansion of the piston rings caused by hot gas flow to improve sealing. The rings are designed to expand when heated, increasing their contact pressure against the piston surface and improving the gas seal, while the gas tube is designed with sufficient clearance to accommodate its own thermal expansion.

Inventive Principle:

Principle #37Thermal expansion

3Quantity of substance

If higher capacity magazines are used to increase ammunition capacity, then more rounds are available, but reliability shortcomings become more evident leading to malfunctions

Engineering Contradiction:

Improveammunition capacityVSAvoidfirearm malfunction rate

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent converts the hot gas flow that causes ring gap alignment issues into a beneficial sealing mechanism. The continuous exposure to hot gas during sustained fire (which increases with higher capacity magazine use) causes the rings to expand and seal, preventing gas leakage and maintaining reliability during extended 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

These modifications significantly reduce gas leakage, prevent overheating, and stabilize the bolt carrier, resulting in a more reliable and safer firearm with improved cyclic control, capable of handling higher capacity magazines and sustained fire without malfunction.

Implementation Method 1

a heat dissipating gas tube

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 2

Each of the rings is a split ring that has a gap formed therein to facilitate installation of the ring and to allow the ring to apply an outward spring force

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11137222B2Firearm systems and methods

Publication Date: 2021.10.05 ARMWEST

AI summary

A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is larger than that of a standard M16/M4. A bolt carrier can have a bolt that has a double cut cam having an unlocking cam surface that has sufficient dwell increase to delay a start of unlocking when the bolt carrier is used in an M4 carbine. A stepped extractor pin may be provided that prevents disengagement of the extractor pin. A tube can be configured to provide gas from a barrel of the firearm to the piston via the carrier key. The tube can have a heat radiator formed from triangular shaped threads on at least a portion of the tube. A piston on the bolt and can have a plurality of rings including pairs of mating rings that are formed and maintained as a matched pair.