Firearm Barrel Adaptor Extractor Mechanism
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Solution Overview
Problem
Conventional extractors for Contender-style firearms lack efficient mechanisms for loading and unloading different types of ammunition, particularly rimmed and rimless cartridges, due to their design limitations which hinder smooth cartridge extraction and insertion processes.
Innovation Solution
A barrel adaptor with a monolithic construction, featuring a main body with a breech end and discharge end, an internally threaded barrel-receiving bore, and a lug with a crossbore for mounting, along with parallel extractor channels and a biasing system using coil springs to facilitate the extractor's movement between firing and extended configurations, enabling smooth cartridge handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional extractor with a simple tapered bar design is used, then the device complexity is reduced, but the ease of operation deteriorates due to inability to smoothly handle both rimmed and rimless cartridges
Solution Approach 1:
The extractor is designed with dynamic movement capabilities, allowing it to rock between the chamber and discharge end, and to pivot toward and away from the chamber. This dynamic behavior enables the extractor to adapt its position for different cartridge types (rimmed and rimless), improving ease of operation without requiring multiple extractors
Solution Approach 2:
The extractor is divided into functional segments: a head portion for engaging cartridges, a body portion with cam surfaces, and a tapered bar portion. This segmentation allows each part to perform its specific function efficiently, with the cam surfaces providing leverage for extraction and the tapered portion providing structural support
2Ease of operation
If the extractor is designed to pivot and move longitudinally for smooth cartridge handling, then the ease of operation improves, but the device complexity increases due to additional channels and biasing mechanisms
Solution Approach 1:
The extractor channels are merged with the barrel structure, forming an integrated receptacle that houses the extractor. The biasing mechanism (leaf spring) is also integrated into the barrel assembly. This merging reduces the number of separate components while maintaining the necessary complexity for smooth cartridge handling
Solution Approach 2:
The extractor is designed to be self-biasing through the leaf spring mechanism that automatically returns the extractor to its forward position after cartridge extraction. The cam surfaces and tapered bar provide self-contained mechanical advantage, eliminating the need for external actuation mechanisms
3Manufacturing precision
If a monolithic barrel adaptor construction is used, then the manufacturing precision and structural integrity improve, but the ease of manufacture deteriorates due to the complexity of forming integrated channels and receptacles
Solution Approach 1:
The barrel adaptor is designed as a universal component that can accommodate different cartridge types and extractor configurations. The monolithic construction with integrated channels and receptacles ensures consistent alignment and precision across various applications, making it a multi-functional solution
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 solution allows for efficient loading and unloading of various ammunition types by enabling the extractor to pivot and move longitudinally, ensuring proper engagement and extraction of cartridges, thus enhancing the firearm's versatility and operational reliability.
Implementation Method 1
a biasing system using coil springs to facilitate the extractor's movement between firing and extended configurations
Data Source
AI summary
A barrel adaptor for a single-shot break-action firearm comprises a barrel stub and an extractor. The barrel stub comprises a main body and a mounting lug. A barrel-receiving bore extends through the main body and can threadedly receive a barrel. Opposed parallel extractor channels are formed between the barrel-receiving bore and the locking bolt receptacle, substantially parallel to the barrel-receiving bore. An extractor head recess at the breech end of the main body extends into the barrel-receiving bore and into the lug, merging with the extractor channels to form an extractor receptacle. The extractor comprises an extractor head having an arcuate cartridge-engaging lip and opposed, spaced apart substantially parallel extractor arms received in the extractor channels. The extractor is longitudinally movable between a firing configuration where the extractor head is in the extractor head recess and an extended configuration where the extractor head is withdrawn from the extractor head recess.