Firearm Trigger Group Selector Mechanism for Mode Switching
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Solution Overview
Problem
Existing trigger systems for semi-automatic firearms lack the ability to switch between safe, semi-automatic, and release trigger modes, and are not adaptable to various weapon platforms like the AR-15 and M-16, posing limitations in user control and safety.
Innovation Solution
A trigger group with a selector mechanism that allows the firearm to switch between safe, semi-automatic, and release modes, featuring a frame, hammer, trigger element, and retention facilities, enabling discharge in response to trigger movement in different positions, and an ambidextrous safety selector for user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release trigger system is implemented to fire upon trigger release rather than trigger pull, then user control and safety are enhanced, but the device complexity increases due to additional selectors and disconnectors
Solution Approach 1:
The patent combines the safety selector and mode selector into a single integrated selector mechanism with three positions (safe, semi-automatic, release). This merging eliminates the need for separate selectors while maintaining all required functions, directly reducing device complexity while preserving the enhanced user control and safety features of the release trigger system
Solution Approach 2:
The single selector mechanism performs multiple functions: it acts as both a safety selector (preventing accidental discharge) and a mode selector (controlling firing modes). This multi-functionality allows the system to achieve complex control capabilities without proportionally increasing the number of components, resolving the contradiction between reliability enhancement and device complexity
2Adaptability or versatility
If two disconnectors are used to enable release trigger mode, then the ability to fire upon trigger release is achieved, but the device complexity and operational difficulty increase
Solution Approach 1:
The patent integrates the functions of multiple disconnectors into a single disconnector mechanism that works in conjunction with the three-position selector. This consolidation reduces the number of moving parts and simplifies the overall trigger group architecture while maintaining the versatility to operate in safe, semi-automatic, and release modes
Solution Approach 2:
The disconnector is designed with dynamic engagement characteristics that allow it to interact differently with the hammer and selector based on the selected mode. This dynamic behavior enables the single disconnector to perform the functions that would otherwise require multiple static disconnectors, achieving adaptability without proportional complexity increase
3Ease of operation
If the mode selector is located on the trigger, then mode selection is integrated with trigger operation, but accidental mode changes can occur during normal trigger manipulation
Solution Approach 1:
The patent segments the trigger assembly into distinct functional zones: the trigger itself for firing activation and the separately positioned selector for mode selection. This spatial segmentation allows each component to perform its function independently, preventing accidental mode changes during normal trigger manipulation while maintaining ease of operation through intuitive separate controls
Solution Approach 2:
The selector mechanism acts as an intermediary between the user's intent and the firing mode configuration. By positioning it separately from the trigger and requiring deliberate selection, it mediates mode changes to prevent accidental activation while maintaining clear user control. The selector serves as a buffer that decouples mode selection from trigger operation
Data Source
AI summary
Trigger groups for semi-automatic firearms have a frame, a hammer connected to the frame and movable between a cocked position and a striking position, the hammer being biased toward the striking position, a trigger element connected to the frame and movable by a user between a forward position and a rearward position, a selector connected to the frame and movable between at least a first position and a second position, a plurality of retention facilities each operable to selectively restrain the hammer in the cocked position, and when the selector is in the first position to enable discharge of the firearm in response to movement of the trigger to the rearward position, and when the selector is in the second position to enable discharge of the firearm in response to movement of the trigger to the forward position after movement to the rearward position.