Small Firearm Locking-Space Guide Surface for Caliber Reliability
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Solution Overview
Problem
Existing small firearms, particularly those designed for specific calibers, are susceptible to malfunctions when adapted to fire different cartridges, and there is a need for a method to reduce this susceptibility and maintain operational reliability.
Innovation Solution
Incorporating a guide surface within the locking mechanism area to limit the entry and favor the exit of cartridge cases during the action's movement, utilizing the interaction of the ejector and extractor to enhance the repeater or automatic process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If small firearms are adapted to fire different cartridges, then versatility is improved, but susceptibility to malfunctions increases
Solution Approach 1:
The guide surface acts as an intermediary element between the cartridge case and the locking mechanism. It mediates the interaction by providing a controlled contact surface that guides the cartridge case during extraction and ejection, preventing erratic movements that could cause malfunctions while maintaining caliber adaptability
Solution Approach 2:
The guide surface modifies the geometric parameters of the locking space by providing a specifically shaped contact surface. This changes the movement parameters of the cartridge case during extraction, constraining it to a predictable path that reduces malfunction risk across different cartridge calibers
2Adaptability or versatility
If the locking space is enlarged to accommodate different cartridge cases, then adaptability is improved, but cartridge case control deteriorates
Solution Approach 1:
The guide surface provides localized quality enhancement within the locking space. While the overall locking space remains large enough to accommodate different cartridge calibers, the guide surface creates a localized controlled interaction zone that maintains precise cartridge case control despite the enlarged space
Solution Approach 2:
The guide surface serves as an intermediary structure within the locking space that mediates between the need for large accommodation space and the need for precise cartridge case control. It provides a controlled contact interface that guides cartridge case movement throughout the available space
Data Source
AI summary
A small firearm includes: a receiver; a barrel including a barrel bore axis; an action including a bolt head; and a guide surface, the receiver being configured for (i) at least indirectly receiving the barrel including a locking mechanism area, a chamber, a guide area, and a muzzle arranged successively in the longitudinal direction, and (ii) at least indirectly receiving the action movably arranged within the receiver along the longitudinal direction from an open position to a closed position, the guide surface, which is within a locking space, being configured such that at least one of (i) an entry of a cartridge case under an influence of a torque during a movement of the action from a closed position to an open position is limited due to an interaction of an ejector and an extractor and (ii) an exit of the cartridge case is favored.