Self-Ejecting Muzzleloader Cartridge with Segmented Propellants
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Solution Overview
Problem
Muzzleloaders are prone to barrel explosions due to the use of incorrect powder burn rates or amounts, and traditional propellants cause corrosion, making it difficult to safely use modern smokeless powders.
Innovation Solution
A self-ejecting muzzleloader cartridge with a perforated case containing separate fast- and slow-burning propellants, a nitrocellulose separator disk, and a cone-shaped end for pressure release, allowing for premeasured smokeless powder use and eliminating corrosion risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smokeless powder is used in muzzleloaders, then firing safety and accuracy are improved, but barrel explosion risk increases due to incorrect powder burn rate or amount
Solution Approach 1:
The cartridge case is divided into multiple compartments separated by partitions, with each compartment containing a specific type and amount of propellant. This segmentation ensures that the correct burn rate and amount of powder are used, preventing barrel explosion while maintaining firing safety and accuracy.
Solution Approach 2:
The propellants are pre-measured and pre-positioned in the cartridge case during manufacturing. This preliminary action eliminates human error in propellant measurement and ensures the correct burn rate is used, thereby preventing barrel explosion risk while maintaining reliability.
2Ease of operation
If traditional black powder is used, then ease of operation is maintained, but barrel corrosion increases
Solution Approach 1:
The propellant composition is changed from traditional black powder to smokeless powder with controlled burn rate. This parameter change eliminates corrosive oxidizers while maintaining ease of operation through pre-measured charges, thereby reducing barrel corrosion without sacrificing ease of loading.
3Manufacturing precision
If premeasured propellant is used, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The cartridge case is segmented into multiple compartments with partitions, allowing precise pre-measurement of different propellant types in each section. This segmentation achieves manufacturing precision while keeping the overall structure relatively simple and manageable.
Solution Approach 2:
The cartridge case serves multiple functions: it contains and separates different propellants, provides the firing mechanism, and acts as the barrel interface. This multi-functionality reduces the need for additional separate components, thereby achieving precision without excessive complexity.
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 cartridge ensures safe and accurate firing by separating propellants, preventing barrel corrosion, and allowing easy loading and unloading, while eliminating human error in propellant measurement and reducing barrel wear.
Implementation Method 1
a thin nitrocellulose separator disk which separates the initiator from the main propellant charge
Implementation Method 2
a combustible liner lining the interior space; a first propellant received in the interior space; and a second propellent having a different characteristic received in the interior space rearward of the first propellant
Implementation Method 3
The cone shaped top with center hole at the end of the cartridge provides a constriction which will allow high pressure gas to the sabot containing the bullet but offers enough resistance to eject the cartridge
Implementation Method 4
The holes in the sides of the cartridge allow the hot gases produced by the burning propellant to leave the sides of the cartridge and equalize the pressure within the barrel at this location
Data Source
AI summary
A muzzleloader cartridge comprises a case having an open rear end, a forward end defining a vent hole, and sidewall defining a plurality of perforations. The case defines an interior space with a combustible liner lining the interior space; a first propellant received in the interior space; and a second propellent having a different characteristic received in the interior space rearward of the first propellent.