Firearm Extractor with Localized Thickness for Larger Cartridges
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Solution Overview
Problem
Existing firearm extractors struggle to accommodate larger cartridge casings, leading to reduced strength and increased failure rates due to the reduction in web thickness when modified to fit larger calibers, resulting in malfunctions and misfires.
Innovation Solution
A firearm extractor design with increased thickness at specific locations, particularly at the notch, and a support tower on the outer side, providing enhanced structural support and durability for larger cartridges, while maintaining compatibility with existing firearm platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the extractor web thickness is reduced to accommodate larger cartridge casings, then the extractor can engage larger calibers, but the strength and durability of the extractor decrease
Solution Approach 1:
The extractor features variable thickness with localized reinforcement: the web thickness increases from 0.019 inches in the engagement area to 0.043-0.055 inches at the rear portion. This local quality variation allows the extractor to accommodate larger cartridge casings while maintaining sufficient strength in the reinforced regions to prevent failure under increased loads from larger calibers.
2Strength
If the extractor thickness is increased to maintain strength for larger cartridges, then the extractor durability improves, but the extractor may interfere with barrel lugs during cycling
Solution Approach 1:
The extractor implements spatially varying thickness: thinner (0.019 inches) in the forward engagement zone to avoid lug interference during cycling, and thicker (0.043-0.055 inches) in the rear support zones to maintain strength. This local differentiation resolves the contradiction by providing thin sections where clearance is needed and thick sections where structural integrity is required.
Solution Approach 2:
The extractor uses the axial dimension (length along the extractor) to resolve the thickness conflict. By varying thickness along the axial direction - thinner forward, thicker rearward - the design accommodates both operational clearance requirements and structural strength requirements in different spatial zones of the same component.
3Strength
If the extractor is designed with uniform thickness for strength, then the extractor durability improves, but the extractor cannot accommodate larger cartridge casings
Solution Approach 1:
Rather than uniform thickness, the extractor employs non-uniform thickness distribution: 0.019 inches in the cartridge engagement region to accommodate larger casings, and 0.043-0.055 inches in the rear support regions to maintain overall strength. This local quality variation allows the extractor to handle both larger cartridge dimensions and the increased forces they generate.
Solution Approach 2:
The extractor is effectively segmented into functional zones with different thickness requirements: a forward engagement zone with reduced thickness for cartridge accommodation, and rear support zones with increased thickness for structural strength. This segmentation allows each zone to be optimized for its specific function while working together as an integrated component.
Data Source
AI summary
Provided herein are extractors, bolt assemblies, firearms, and related methods, devices, and assemblies. A firearm extractor includes a first end, a second end opposite the first end, an axis defined between the first end and the second end, and a pivot portion between the first end and the second end. The extractor may include a notch defined at the inner side of the extractor at an axial location between the pivot portion and the first end that, in operation, engages a cartridge casing having a diameter greater than a casing of a 5.56 NATO cartridge or other platform-standard cartridge. A thickness of the extractor in at least one location defined at the axial location of the notch disposed radially inward of one or more lugs of a barrel or a barrel extension during cycling of the bolt may be greater than 0.019 inches.