Rimless Cartridge Extractor Assembly for Revolvers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Revolvers are limited in accommodating rimless cartridges due to the need for a large central bore, which compromises cylinder strength and leads to jamming and breakage issues, requiring separate stocks of rimmed and rimless ammunition of the same caliber.
Innovation Solution
A cylinder assembly with a dual coil spring projection mechanism that radially engages rimless cartridges, allowing reliable extraction without a large central bore, using a spring-biased extractor head assembly that locks cartridges in place and ejects them without compromising cylinder strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large central bore is used to accommodate the ejector assembly for rimless cartridges, then rimless cartridges can be extracted, but cylinder strength is reduced
Solution Approach 1:
The extractor assembly is segmented into multiple radial projections distributed around the central bore, with each projection handling one cartridge chamber. This segmentation allows the ejector rod to be thinner while still providing sufficient extraction force across all chambers, thereby maintaining cylinder strength.
Solution Approach 2:
The extraction mechanism transitions from a single central ejector point to multiple radial projection points distributed circumferentially. This dimensional redistribution of extraction forces allows use of a smaller central bore while achieving the same extraction functionality across all cartridge chambers.
2Adaptability or versatility
If spring clips are used to retain rimless cartridges, then rimless cartridges can be held in place, but the clips are prone to breakage and jamming
Solution Approach 1:
The problematic spring clips are completely removed from the design. Instead, the invention uses spring-biased radial projections that engage the rimless cartridges through a different mechanical approach - the projections are integrated into the extractor assembly rather than being separate clips, eliminating the breakage and jamming issues associated with clips.
Solution Approach 2:
The design replaces fragile spring clips with more robust radial projections made from durable extractor assembly material. The projections are designed to withstand repeated use without the breakage-prone spring clip structure, effectively creating a more reliable, long-lasting retention mechanism.
3Adaptability or versatility
If spring fingers are used for extracting rimless cartridges, then extraction is possible, but uniform discharge and ejection is problematic and cylinder strength may be reduced
Solution Approach 1:
The extractor assembly uses multiple segmented radial projections positioned at specific intervals around the central bore. Each projection corresponds to a cartridge chamber and provides localized extraction force. This segmented approach ensures uniform engagement and discharge of all rimless cartridges simultaneously, eliminating the non-uniform ejection problems of spring fingers.
Solution Approach 2:
Each radial projection is locally optimized to engage the rimless cartridge in its specific chamber position. The projections have tailored geometries and spring biases suited to their local requirements, ensuring uniform extraction across all chambers while maintaining overall cylinder strength through distributed rather than centralized loading.
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
Enables the reliable use of rimless cartridges in revolvers across various calibers, including 40 caliber, 45 caliber, and 9 mm, without reducing cylinder strength, ensuring long-term functionality and avoiding jamming and breakage.
Implementation Method 1
dual coil spring projection mechanism that radially engages rimless cartridges, allowing reliable extraction without a large central bore, using a spring-biased extractor head assembly
Data Source
AI summary
A rimless cartridge cylinder assembly is used for adapting revolvers which typically require the use of rimmed cartridges to accept rimless cartridges. The assembly includes an extractor mechanism having an extractor rod extending axially through a center passage provided in a cylinder having chambers adapted to receive cartridges. The extractor mechanism has an axially extendable extractor head assembly disposed at a cartridge loading end of the cylinder. The head assembly includes a plurality of spring biased projections housed therein which extend radially into engagement with corresponding grooves in rimless cartridges as they are loaded into each chamber. After discharge, rearward displacement of the head assembly allows the engaged projections to remove the spent cartridges from each chamber. Utilizing the rimless cartridge cylinder assembly, rimless cartridges typically used only with automatic hand guns can be loaded and fired in a revolver with long term reliably.