Adjustable Bolt Lock for Single-Shot Firearm Operation
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Solution Overview
Problem
Semi-automatic firearms automatically reload after each discharge, which can lead to unintended firing and increased noise and gas discharge, lacking a mechanism to operate as a single-shot firearm safely and quietly.
Innovation Solution
A bolt lock safety device that includes an adjustable bolt lock and a lock adjuster, allowing the firearm to be modified to prevent automatic reloading by extending a bar to stop the bolt's recoil, enabling manual loading and reducing noise and gas discharge when engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a semi-automatic firearm automatically reloads after discharge, then reloading efficiency is improved, but unintended firing and noise/gas discharge increase
Solution Approach 1:
The bolt lock safety device features an adjustable bar that can dynamically change position between extended (blocking bolt recoil) and retracted (allowing bolt recoil) states. This dynamic adjustment allows the firearm to switch between single-shot and semi-automatic modes, enabling users to eliminate unintended firing and noise when needed while maintaining reloading efficiency when desired.
Solution Approach 2:
The device changes the operational parameter of bolt recoil by extending the bar to limit bolt movement and prevent automatic reloading. This parameter change transforms the firearm from automatic reload mode to single-shot mode, eliminating the harmful effects of unintended firing and excessive noise/gas discharge while preserving the ability to reload manually.
2Reliability
If the bolt lock safety device extends the bar to prevent automatic reloading, then safety and noise reduction are improved, but device complexity increases
Solution Approach 1:
The adjustable bar serves multiple functions: it acts as a safety mechanism to prevent unintended firing, a noise reduction device by limiting bolt recoil, and a mode-switching component between single-shot and semi-automatic operation. This multi-functionality justifies the added complexity by providing comprehensive safety and control benefits.
Solution Approach 2:
The adjustable bar acts as an intermediary component between the bolt mechanism and the user's safety requirements. By positioning this mediator in the bolt's path, it controls bolt recoil movement and prevents automatic reloading when extended, thereby achieving safety goals with a relatively simple mechanical addition.
3Ease of operation
If the bar is extended to stop bolt recoil, then automatic reloading is prevented, but manual operation complexity increases
Solution Approach 1:
The adjustable bar provides dynamic control over bolt recoil, allowing users to switch between extended (manual loading only) and retracted (automatic reloading) positions. This dynamic capability enhances manual loading control when needed while maintaining ease of automatic operation when desired, balancing operational complexity with user needs.
Data Source
AI summary
A method for operating a semi-automatic firearm as a single-shot firearm comprising: installing a bolt in the firearm, wherein the bolt comprises a bolt lock safety device, wherein the bolt lock safety device extends beyond a face of the bolt when engaged preventing the firearm from automatically reloading; when the bolt lock safety device is engaged, pulling a charging handle back to cause the bolt to move rearward exposing the firearm chamber to reload a cartridge, wherein the adjustable bolt lock is simultaneously rotated by the lock pivot pin to lay flush with the bolt forcing the bolt back into forward position; and upon release of the charging handle, automatically reengaging the adjustable bolt lock via a lock return spring causing the adjustable bolt lock to extend beyond the face of the bolt.