Airgun Sound Moderator With Polymer Felt Baffles

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Solution Overview

Problem

Airgun sound moderators made from fibrous polymeric felt deteriorate rapidly when exposed to gunpowder combustion products and temperatures, posing legal concerns and incompatibility issues with firearms, and existing firearm silencers are subject to stringent regulations and legal liabilities when used on airguns.

Innovation Solution

An airgun sound moderator assembly featuring a stack of acoustic baffles made from fibrous polymer felt with a polymer softening and melting temperature below 300°C, designed to rapidly deteriorate when exposed to gunpowder combustion products and temperatures, ensuring compatibility only with airguns and avoiding legal issues associated with firearm use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If fibrous polymeric felt is used for acoustic baffles, then sound absorption is improved, but thermal stability deteriorates due to rapid deterioration at gunpowder combustion temperatures

Engineering Contradiction:

Improveacoustic impulse reductionVSAvoidthermal stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the material parameter (polymer softening temperature) to be below 300°C, ensuring the baffles deteriorate when exposed to gunpowder combustion temperatures. This parameter selection allows the material to function as intended for sound absorption while inherently preventing use in firearm applications through controlled thermal degradation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The acoustic baffles are designed as disposable components that rapidly deteriorate upon exposure to high temperatures. This ensures they cannot be used with firearms while maintaining effective sound suppression for airguns during normal operation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Object-affected harmful factors

If firearm silencers are used on airguns, then acoustic impulse reduction is improved, but legal compliance deteriorates due to NFA regulations

Engineering Contradiction:

Improveacoustic impulse reductionVSAvoidlegal compatibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by making the baffles incompatible with firearms through controlled material degradation at firearm operating temperatures. This localized incompatibility ensures legal compliance while maintaining effectiveness for airgun applications.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The polymer baffle material acts as an intermediary that mediates between airgun and firearm applications. It allows effective sound suppression for airguns while inherently preventing firearm use through thermal degradation, thus serving as a legal compliance mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If polymer softening temperature is lowered below 300°C, then firearm incompatibility is improved, but structural rigidity deteriorates above the service temperature

Engineering Contradiction:

Improvefirearm incompatibilityVSAvoidstructural rigidity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent carefully selects polymer materials with softening temperatures below 300°C that maintain sufficient rigidity at airgun operating temperatures (typically below 100°C). The parameter optimization ensures both firearm incompatibility and adequate structural integrity for airgun applications.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The baffles are designed with local quality considerations, ensuring sufficient rigidity at airgun operating temperatures while being inherently incompatible with firearms. The material properties are optimized for the specific temperature range of airgun operation.

Inventive Principle:

Principle #3Local quality

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 airgun sound moderator assembly effectively reduces acoustic impulse to hearing-safe levels without the legal and regulatory risks associated with firearm silencers, providing a safe and compliant sound suppression solution for airguns.

Implementation Method 1

a stack of plural acoustic baffles which are each fabricated from a fibrous polymer felt

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Implementation Method 2

the polymer softening temperature and the polymer melting temperature are both less than three hundred degrees celsius, such that the plural acoustic baffles will rapidly deteriorate if exposed to gunpowder combustion products and temperatures

Methodology Applied

Scientific EffectThermal decomposition: Pyrolysis

Data Source

PatentUS11817074B2Airgun sound moderator with polymeric acoustic baffles

Publication Date: 2023.11.14 MCCASLIN JOHN A

AI summary

An airgun moderator employing a stack of acoustic baffles fabricated from fibrous polymeric felt, which degrades in the presence of gunpowder combustion temperatures, thereby providing an effective airgun sound moderator that us ineffective as a firearms silencer.