Lever-Coupled Bolt Catch for Firearm Discharge Control
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Solution Overview
Problem
Semi-automatic firearms automatically eject and chamber new cartridges after each discharge, allowing repeated firing without user intervention, which may be undesirable in certain situations, necessitating a mechanism to prevent discharge until the user takes additional action.
Innovation Solution
A bolt catch device that moves between a released and depressed position, preventing the bolt from moving into the chamber unless manually actuated, incorporating a linkage and camming surface mechanism to control the bolt catch's position and interaction with the bolt, ensuring the firearm can only discharge after user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the self-loading mechanism is actuated by high-pressure propellant gas to automatically eject spent shells and chamber new cartridges, then the firearm achieves automatic ejection and chambering capability, but the firearm can be repeatedly discharged without additional user action beyond trigger manipulation
Solution Approach 1:
The patent introduces a bolt catch as an intermediary component between the bolt carrier assembly and the firing mechanism. This bolt catch physically blocks the bolt's forward movement when engaged, serving as a mediator that interrupts the automatic cycling process. The bolt catch is controlled by a selector switch, creating an intermediate control layer that prevents direct translation of trigger pull into bolt movement and subsequent discharge, thereby giving the user additional control over when discharges can occur.
2Reliability
If the bolt catch is positioned within the path of travel of the bolt carrier assembly to prevent bolt movement, then the firearm discharge is prevented, but the device complexity increases due to the additional bolt catch and lever components
Solution Approach 1:
The patent merges the bolt catch functionality with the existing selector switch mechanism of the firearm. The lever that controls the bolt catch is integrated with or directly actuated by the selector switch, combining two control functions into a unified system. This merging approach allows the bolt catch mechanism to be controlled through an existing user interface (the selector switch) rather than requiring a completely separate control system, thereby reducing the net increase in device complexity while maintaining reliable prevention of unintended discharge.
Data Source
AI summary
The present disclosure generally relates to a bolt catch device that prevents the bolt of a bolt carrier assembly of a firearm from moving to its forward position so as to prevent the firearm from being discharged until the user manually moves the bolt catch. The bolt catch is mechanically coupled to the selector of the firearm via a linkage, so that the bolt catch can be moved by way of the selector. This feature can prevent a self-loading firearm that otherwise could function on a semi-automatic basis from operating in such a manner.