Muzzle-Loading Firearm Mono Block with Threadless Breech Plug
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Solution Overview
Problem
Muzzle-loading firearms with externally-threaded breech plugs face issues such as fouling, difficulty in reinstallation, strength limitations, and safety concerns due to thin barrel walls and inadequate gas retention, while systems without breech plugs struggle with gas pressure and primer retention.
Innovation Solution
A muzzle-loading firearm design featuring a removable, threadless breech plug retained by a breech plug collar and a barrel retaining nut, with a protrusion on the barrel for alignment, and an interlock lever for safety, allowing for ease of manufacture, cleaning, and interchangeability of breech plugs for various primers and propellants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an externally-threaded breech plug is used, then the breech plug can be removed for cleaning and unloading, but the threads foul during cleaning making reinstallation difficult and the barrel wall becomes thinner creating strength limitations
Solution Approach 1:
The invention extracts the threading function from the breech plug itself and relocates it to a separate retaining collar that threads onto the barrel. This allows the breech plug to be removed without threads, eliminating fouling issues while the retaining collar maintains secure attachment. The threading operation is separated from the breech plug component.
Solution Approach 2:
The invention segments the breech assembly into distinct components: a threadless breech plug, a retaining collar with internal threads, and the barrel with external threads. This segmentation allows each component to perform its specific function optimally - the breech plug for sealing and primer placement, the retaining collar for secure attachment, and the barrel for structural support.
2Strength
If the barrel wall is thickened to provide adequate strength for externally-threaded breech plugs, then strength and gas retention improve, but manufacturing cost and weight increase
Solution Approach 1:
The invention extracts the load-bearing threading function from the barrel wall and relocates it to a separate retaining collar. This allows the barrel wall to be optimized for its primary function of containing gas pressure, while the retaining collar handles the mechanical loading from the breech plug attachment. The barrel can use thinner walls with reinforcement rings at critical areas.
3Reliability
If an externally-threaded breech plug is used, then the breech plug can be retained in the barrel, but the barrel must be designed with adequate thickness to resist expansion which increases length, weight and cost
Solution Approach 1:
The invention extracts the retention function from the barrel structure and places it in a dedicated retaining collar component. The collar threads onto the barrel and secures the breech plug, allowing the barrel to be shorter while maintaining reliable retention. The retaining collar absorbs the length requirement for threading engagement.
4Device complexity
If push-in breech plugs with friction retention are used, then the design is simple, but the breech plug is only secured when the breech is closed creating safety concerns
Solution Approach 1:
The invention extracts the retention function from friction-based holding and implements it through a threaded retaining collar that provides positive mechanical engagement. The collar threads onto the barrel and secures the breech plug with thread engagement, providing reliable retention independent of breech closure. This separates the retention mechanism from the breech closure action.
Data Source
AI summary
An improved muzzle-loading firearm with a removable, threadless breech plug retained by a breech plug retaining collar, and a barrel retaining nut for simplifying manufacture, cleaning, preventing fouling and over-pressure situations, and minimizing alignment issues during assembly of the firearm. The removable, threadless breech plug also allows for straightforward interchangeability of breech plugs for use with various primers and propellants. The muzzle-loading firearm has a barrel with a protrusion on the breech end of the barrel that fits into a matched groove within the mono block for use in aligning the barrel during assembly of the firearm. The muzzle-loading firearm has a barrel retaining nut, wherein the barrel retaining nut is internally threaded to accept the threaded end of the barrel thereby retaining the barrel in the mono block.