Firearm Trigger Mechanism Reset Lever
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Solution Overview
Problem
Existing trigger mechanisms in semi-automatic firearms experience a sharp snap upon repeated firing due to the hammer striking the disconnector, leading to finger bruising and a pause in trigger reset, which limits firing speed in competitive shooting.
Innovation Solution
A trigger mechanism with a reset lever that isolates the hammer from the disconnector in the past-cocked position, using a spring to maintain tension and pivot the trigger disconnector assembly from a discharged to a charged orientation, reducing the trigger snap and improving reset speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hammer strikes the disconnector in the past-cocked position to reset the trigger, then the trigger resets to prepare for the next shot, but the hammer generates a sharp snap that causes finger injury and discomfort
Solution Approach 1:
A reset lever is introduced as an intermediary component between the hammer and the disconnector. The reset lever receives the impact from the hammer in the past-cocked position and uses this energy to pivot the disconnector assembly, thereby mediating the energy transfer and eliminating the harmful direct strike to the trigger while achieving the necessary reset function
2Ease of operation
If the hammer travels rearwardly from the cocked position to the past-cocked position and then forwardly to prepare for another trigger pull, then the trigger mechanism is reset, but a substantial pause occurs that limits the speed of repeated trigger pulls
Solution Approach 1:
The reset lever is pre-positioned and ready to engage with the hammer's rearward motion. As the hammer travels to the past-cocked position, the reset lever is already in place to intercept and utilize this motion, initiating the disconnector assembly pivot before the hammer completes its forward travel. This preliminary engagement eliminates the pause and enables continuous rapid firing
3Reliability
If the disconnector hook engages the hammer disconnect notch to prevent forward motion of the hammer, then the trigger mechanism is locked in semi-automatic mode, but the hammer cannot be reset without a trigger pull
Solution Approach 1:
The system transitions from a static locked state to a dynamic reset state through the reset lever. When the trigger is pulled and the hammer reaches the past-cocked position, the reset lever dynamically engages to pivot the disconnector hook away from the hammer disconnect notch, temporarily releasing the lock. This dynamic action allows the hammer to be reset without requiring a second trigger pull, while maintaining reliable semi-automatic locking during normal operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism reduces trigger snap and enhances the speed of repeated trigger pulls, providing a more comfortable shooting experience and faster semi-automatic fire rates.
Implementation Method 1
A spring keeps tension on the reset lever urging the reset lever toward the closed position
Implementation Method 2
the striking end of the hammer strikes the reset lever in the past-cocked position of the hammer pivoting the reset lever from the open position to the closed position
Data Source
AI summary
A trigger mechanism includes a hammer, and a trigger disconnector assembly including a trigger body having a trigger nose, and a disconnector having a disconnector hook. A reset lever is mounted for movement between open and closed positions. The trigger disconnector assembly is in mechanical communication with the reset lever. A striking end of the hammer strikes the reset lever in a past-cocked position of the hammer moving the reset lever from the open position to the closed position, the reset lever acting on the trigger disconnector assembly to reset the trigger body and the disconnector in the past-cocked position of the hammer in preparation for securing the hammer in a cocked position preparatory to firing by another trigger pull of the trigger body.