Combined Bolt Catch Ejector for AKM Rifle
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Solution Overview
Problem
The AKM rifle lacks a bolt hold open capability after the last round of ammunition is fired and ejected, which is a disadvantage in maintaining the design's reliability and accuracy during fully automatic fire.
Innovation Solution
A combined bolt catch and ejector component that allows the bolt to be restrained in a rear position, enabling a case head to strike an ejector surface upon reverse movement, thus providing a bolt hold open functionality while maintaining the benefits of the conventional AKM design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the AKM rifle uses a conventional separate bolt catch and ejector design, then the design maintains simplicity and ease of manufacture, but the bolt hold open capability is lost
Solution Approach 1:
The patent combines the bolt catch and ejector into a single integrated component called a 'combined bolt catch and ejector'. This component has a body that functions as both the bolt catch (to hold the bolt open) and the ejector (to eject spent cartridge cases). The integration maintains design simplicity while restoring the bolt hold open capability that was lost in conventional AKM designs.
Solution Approach 2:
The combined bolt catch and ejector component performs multiple functions: it acts as both a bolt catch mechanism to hold the bolt in the open position and an ejector to remove spent cartridge cases. This multi-functional design allows the AKM rifle to regain bolt hold open capability without adding separate components, thereby maintaining manufacturing simplicity.
2Reliability
If the AKM rifle integrates combined bolt catch and ejector functions into a single component, then bolt hold open capability is restored, but device complexity increases
Solution Approach 1:
The patent combines the bolt catch and ejector into a single integrated component called a 'combined bolt catch and ejector'. This component has a body that functions as both the bolt catch (to hold the bolt open) and the ejector (to eject spent cartridge cases). The integration maintains design simplicity while restoring the bolt hold open capability that was lost in conventional AKM designs.
Solution Approach 2:
The combined bolt catch and ejector component performs multiple functions: it acts as both a bolt catch mechanism to hold the bolt in the open position and an ejector to remove spent cartridge cases. This multi-functional design allows the AKM rifle to regain bolt hold open capability without adding separate components, thereby maintaining manufacturing simplicity.
Data Source
AI summary
Firearms with combined bolt catch and ejector have a bolt defining a bolt face configured to receive a case head of a cartridge, a bolt catch connected to a frame and movable between a first operational position in which bolt reciprocation forward from the rear position is enabled, and a second restraining position in which a portion of the bolt catch restrains the bolt in the rear position, and the bolt catch having an ejector surface portion positioned clear of the bolt face when the bolt catch is in the first operational position and in registration with a portion of the bolt face when the bolt catch is in the second restraining position such that a case head received by the bolt face strikes the ejector surface portion upon movement of the bolt from the forward to the rearward position when the bolt catch is in the second restraining position.