Firearm Bolt Rib for Recoil Cartridge Alignment
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Solution Overview
Problem
The inertial forces exerted on cartridges in a semiautomatic pistol magazine during recoil can cause malfunctions due to the cartridges resisting movement, leading to misalignment and potential misfeeds when the slide moves into battery to strip and chamber a cartridge.
Innovation Solution
A bolt with a surface, such as a rib or stepped surface, is mounted within the slide to exert a controlled force on cartridges in the magazine, counteracting inertial forces by contacting and guiding them during the slide's reciprocating motion, ensuring proper alignment and feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cartridges are held loosely in the magazine, then ease of loading and magazine simplicity are improved, but reliability deteriorates due to malfunctioning caused by inertial forces during recoil
Solution Approach 1:
The bolt surface is positioned to contact cartridges in advance during the slide's reciprocating motion, applying force before the slide moves into battery to strip the cartridge. This preliminary action counteracts inertial forces that would otherwise cause misalignment and feeding malfunctions, ensuring the cartridge is properly positioned beforehand.
2Reliability
If cartridges are held firmly in the magazine, then reliability is improved by preventing movement during recoil, but device complexity increases due to additional mechanisms needed to secure cartridges
Solution Approach 1:
The bolt surface serves multiple functions: it guides the cartridge during feeding, counteracts inertial forces during recoil, and ensures proper alignment when the slide moves into battery. By making the existing bolt structure multi-functional, the patent improves reliability without adding separate mechanisms to secure cartridges in the magazine.
Solution Approach 2:
The slide's existing reciprocating motion is utilized to apply force to the cartridge through the bolt surface. The system uses its own operational movement to solve the problem of cartridge positioning, eliminating the need for additional dedicated mechanisms.
3Reliability
If the bolt surface contacts the cartridge during slide motion, then reliability is improved by counteracting inertial forces, but friction and wear increase between the bolt surface and cartridge
Solution Approach 1:
The bolt surface applies force to the cartridge only during the specific phase of slide reciprocating motion when needed to counteract inertial forces, rather than continuous contact. This partial action reduces unnecessary friction and wear while still achieving the reliability improvement during critical feeding operations.
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
This solution enhances the reliability of semiautomatic pistols by maintaining cartridges in the optimal position within the magazine, reducing the likelihood of misfeeds and stoppages by counteracting recoil-induced inertial forces, thereby improving the overall operational consistency of the firearm.
Implementation Method 1
friction between the surface and the cartridge exerts the force on the cartridge
Implementation Method 2
The cartridges are held only loosely in the magazine and resist moving in response to recoil by their own inertia
Data Source
AI summary
A pistol has a bolt with a surface that contacts the cartridge in the magazine to next be chambered. The bolt is mounted within the slide. As the bolt moves with the slide out of battery the surface exerts a force on the cartridge in the direction of motion of the slide. The force counteracts inertial forces on the cartridge imposed by recoil of the pistol.