Ambidextrous Bolt Hold Open and Fire Selector for Kalashnikov Firearms
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Solution Overview
Problem
Kalashnikov style firearms lack a convenient and ambidextrous mechanism to hold open the bolt and select firing modes, such as semi-automatic or fully automatic, which complicates operation and safety.
Innovation Solution
A bolt hold open, fire selector, and safety apparatus comprising a primary selector piece, a left thumb piece for leverage, and a means for fastening, such as a socket set screw or roll pin, that allows users to easily select and maintain firing configurations by blocking the disconnector and trigger assembly, preventing discharge in safe mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Kalashnikov style firearms use a traditional firing mechanism, then the structure is simple, but the operation is not convenient and lacks ambidextrous control for bolt hold open and fire selector functions
Solution Approach 1:
The patent combines the bolt hold open function and fire selector function into a single integrated mechanism. The bolt hold open piece is directly coupled to the fire selector, allowing both functions to be controlled through one unified structure rather than separate mechanisms, thereby improving operational convenience while controlling structural complexity
Solution Approach 2:
The integrated mechanism serves multiple functions: it acts as both a bolt hold open device and a fire selector (selecting between semi-automatic and fully automatic modes). This multi-functional design eliminates the need for separate control mechanisms, improving ease of operation without proportionally increasing device complexity
2Reliability
If Kalashnikov style firearms lack a dedicated safety mechanism, then the structure remains simple, but accidental discharge cannot be prevented
Solution Approach 1:
The safety function is integrated into the existing fire selector mechanism. When the fire selector is positioned in the safe configuration, it automatically blocks the disconnector and trigger assembly through the integrated blocking mechanism, providing safety functionality without requiring a completely separate safety device
Solution Approach 2:
The mechanism uses its own structure to provide safety functionality. The blocking mechanism is part of the fire selector assembly itself, utilizing the existing components and their arrangements to prevent accidental discharge, rather than relying on an entirely separate safety system
3Reliability
If a separate bolt hold open mechanism is used, then the bolt can be held open reliably, but the operation becomes less convenient and requires additional controls
Solution Approach 1:
The bolt hold open function is merged with the fire selector control. The single integrated mechanism allows the user to control both bolt hold open and fire selection through one unified interface, improving operational convenience while maintaining the reliability of the bolt hold open function through direct mechanical coupling
Data Source
AI summary
This disclosure describes embodiments of an apparatus which will be called a bolt hold open, fire selector and safety. This apparatus is for ambidextrously holding open the bolt of a Kalashnikov style firearm; for ambidextrously selecting whether the Kalashnikov style firearm will fire multiple rounds or a single round each time the user pulls and holds down the trigger on the firearm when the firearm contains an auto sear mounting pin; for ambidextrously selecting whether the Kalashnikov style firearm will fire a single round each time the user pulls and holds down the trigger on the firearm when the firearm does not contain an auto sear mounting pin; and for ambidextrously selecting whether the Kalashnikov style firearm will fire when the user pulls the trigger on the firearm.