Ported Barrel Assembly for .22 Magnum Cycling
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Solution Overview
Problem
The .22 Magnum semi-automatic firearms face issues with reliable cycling and ejection due to the Blish effect, where the static bond between the brass cartridge case and steel barrel chamber prevents sufficient force from being applied to the bolt face, especially with high-velocity rounds that dissipate pressure quickly, leading to incomplete extraction and cycling failures.
Innovation Solution
A barrel assembly with a rifled bore and a chamber featuring supply and release ports that reduce the static bond by redirecting propellant pressure, allowing the cartridge case to release from the chamber and cycle the firearm mechanism effectively, comprising a barrel sleeve and ports that manage propellant pressure to facilitate reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cartridge case is driven into contact with the barrel chamber using propellant pressure, then the chamber is sealed and the bullet is propelled, but the static bond between the cartridge case and barrel chamber prevents sufficient force from being applied to the bolt face for reliable cycling
Solution Approach 1:
The patent extracts a portion of the propellant pressure from the chamber by providing a port that communicates the propellant pressure from the chamber to the exterior of the cartridge case. This removes the harmful static bond effect while maintaining the beneficial sealing and propulsion functions.
Solution Approach 2:
The port acts as an intermediary that redirects propellant pressure to act on the exterior of the cartridge case rather than solely relying on the static bond between the cartridge case and chamber walls. This mediator allows the system to overcome the adhesive friction problem.
2Speed
If high-velocity rounds are used to achieve flat trajectory and low recoil, then shooting performance is improved, but pressure dissipates quickly leading to incomplete extraction and cycling failures
Solution Approach 1:
The port is positioned to allow propellant pressure to act on the exterior of the cartridge case during the critical early phase of combustion when pressure is highest. This preliminary action ensures the cartridge case is pushed forward reliably before pressure dissipates.
Solution Approach 2:
The patent uses pneumatic pressure from the propellant gases, redirected through the port, to act on the exterior of the cartridge case. This hydraulic/pneumatic action provides reliable extraction force that overcomes the quick pressure dissipation characteristic of high-velocity rounds.
3Stability of the object's composition
If the static bond between cartridge case and barrel chamber is maintained, then the chamber remains sealed, but the adhesive friction reduces the force available to cycle the firearm mechanism
Solution Approach 1:
The port extracts a portion of the propellant pressure to act on the exterior of the cartridge case, separating the sealing function (maintained by chamber contact) from the cycling force generation (provided by external pressure action).
Solution Approach 2:
The port is located at a specific position on the barrel assembly to optimize where propellant pressure acts on the cartridge case exterior. This local modification provides the necessary force without compromising the overall chamber sealing.
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 barrel assembly enhances the reliable cycling and ejection of .22 Magnum cartridges by reducing the static bond, ensuring consistent operation and enabling the use of new small caliber, high-velocity rounds in existing firearms, while being cost-effective and suitable for high-volume manufacturing.
Implementation Method 1
The pressure created by the ignited propellant then drives the bullet out of the cartridge case and down the rifled barrel of the firearm
Implementation Method 2
The Blish effect is used to advantage in the firing chambers of most cartridge firearms. When a cartridge ignites within a firearm chamber, the brass cartridge case expands against the steel chamber of the barrel causing a temporary static bond, and high friction, between the walls of the barrel chamber and the cartridge case
Data Source
AI summary
A barrel assembly for use in a firearm that reduces the static bond due to propellant pressure between the cartridge case and the barrel chamber. The barrel assembly has a barrel with a rifled bore, and a chamber for receiving a cartridge therein. The barrel chamber having a throat portion adjacent the rifled bore, and the chamber also having a body portion for receiving the cartridge case therein. The cartridge comprising a cylindrical cartridge case, a bullet engaged within the cartridge case. The cartridge case contains a propellant producing a propellant pressure upon ignition of the propellant. A barrel sleeve configured to receive the barrel within and to positively engage the barrel. A recess is formed between the barrel and barrel sleeve, forming a propellant pressure interconnect passage. The barrel has supply ports passing from the chamber throat to the propellant pressure interconnect passage, and the release ports passing from the propellant pressure interconnect passage, and into the chamber body. Upon ignition of the propellant, the bullet is forced by propellant pressure out of the cartridge case and into the rifled bore of the barrel. The propellant pressure passes into the supply ports, into the propellant pressure interconnect passage, and into the release ports. The propellant pressure is then exerted upon the exterior of the cylindrical cartridge case. The static bond due to propellant pressure between the cartridge case and the barrel chamber is reduced and more energy is made available to cycle the firearm mechanism.