Semi-Automatic Trigger Group With External Selector and Safe Binary Mode
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Solution Overview
Problem
Existing trigger systems for semi-automatic firearms require a selector lever within the trigger guard, increasing the risk of accidental discharge and lack a safe mode after trigger pull in binary fire mode.
Innovation Solution
A trigger group design with a selector lever outside the trigger guard and a safety selector assembly allowing safe mode selection, featuring a frame, hammer, trigger, disconnector, and intermittent disconnector spacer to control firing modes, preventing unintended discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the selector lever is placed within the trigger guard, then the trigger system can control firing modes, but the likelihood of accidental discharge increases due to manipulation of the selector lever
Solution Approach 1:
The selector lever is extracted from the trigger guard and repositioned on the pistol grip, separating the mode selection function from the trigger control area. This physical relocation eliminates the risk of accidental mode changes while the trigger is being manipulated, directly resolving the contradiction between adaptability and reliability.
2Adaptability or versatility
If the trigger must be pulled fully rearward or released fully forward to operate, then binary fire mode can be achieved, but the user cannot place the firearm in safe mode after trigger pull
Solution Approach 1:
The selector lever is designed to be dynamically adjustable at any point during trigger movement, not just at extreme positions. The lever can be manipulated to change modes mid-stroke, allowing the user to transition to safe mode even after the trigger has been pulled partway, thus resolving the contradiction between binary fire capability and safe mode accessibility.
3Adaptability or versatility
If two disconnectors are used in the trigger system, then binary fire operation can be achieved, but the device complexity increases
Solution Approach 1:
The primary disconnector is designed to perform multiple functions: it controls both semi-automatic operation and binary fire operation. By making the disconnector multi-functional rather than adding a second dedicated disconnector, the system achieves binary fire capability while minimizing device complexity.
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 disconnector having a hammer engagement facility adapted to selectably engage the hammer, a disconnector control element movable between a first control position and a second control position, the disconnector being operably engaged to the disconnector control element, the disconnector operable to move in a first range of motion when the disconnector control element is in the first control position, and in a second range of motion when the disconnector control element is in the second control position.