Firearm Extractor Support Brace Width and Curvature
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Solution Overview
Problem
Conventional AR15/M4 type firearms' extractors fail due to early pressure spikes in shorter-barreled variants, leading to overworking and premature failure, as they attempt to extract fired cases still under pressure, causing malfunctions and extractor breakage.
Innovation Solution
A cartridge extractor with a support brace of 0.095 inches or greater width, integrated into a bolt and barrel extension design, providing additional strength and clearance to mitigate breakage and accommodate the increased pressure dynamics of carbine-length gas systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional extractors are used in carbine-length gas system firearms, then the firearm can operate with shorter barrels for improved maneuverability, but the extractor experiences premature failure due to extracting pressurized cartridge cases
Solution Approach 1:
The support brace width is changed from conventional dimensions to 0.095 inches or greater, fundamentally altering the structural parameters of the extractor to handle higher pressure conditions in carbine-length gas system firearms
Solution Approach 2:
The support brace features a curved outer surface that contacts the cartridge case, distributing extraction forces more effectively across the curved interface rather than concentrated point contact
2Strength
If the extractor claw is made stronger to prevent breakage, then extractor durability improves, but the extractor may still pull off or snap back off the cartridge case rim causing malfunctions
Solution Approach 1:
The support brace adds a new structural dimension behind the claw, creating a two-dimensional load distribution system rather than relying solely on one-dimensional claw strength, thereby preventing both breakage and rim damage
Solution Approach 2:
The support brace acts as a pre-positioned structural cushion that absorbs and distributes extraction forces before they can concentrate on the claw or cartridge rim, preventing failure modes before they occur
3Force
If stronger springs are used to improve extractor performance, then extraction force increases, but the extractor still fails under repeated pressurized extraction conditions
Solution Approach 1:
The curved outer surface of the support brace distributes extraction forces across a broader curved interface, reducing stress concentration even when high extraction forces are applied by stronger springs
4Object-affected harmful factors
If barrel pins are installed to prevent extractor from pulling off cartridge rim, then rim damage is reduced, but extractor failure still occurs due to overworking under pressure
Solution Approach 1:
The extractor is segmented into functionally distinct components: the claw for engaging the cartridge rim and the support brace for structural reinforcement, allowing each component to be optimized for its specific function
Solution Approach 2:
The extractor combines different material properties in the claw and support brace regions, with the support brace providing composite structural reinforcement to handle pressurized extraction conditions
Data Source
AI summary
The present disclosure generally relates to extractors for extracting cartridges from firearms, as well as bolts including the extractors, and barrels or barrel extensions configured to receive the bolts and extractors. The extractor includes a support brace having a width greater than 0.095 inches. A barrel extension includes a shortened lug to accommodate an extractor having a support brace with a width greater than 0.095 inches.