Slotted Trigger Actuation Mechanism for Firearm Drop Safety
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Solution Overview
Problem
Existing firearms safety mechanisms, particularly in small arms pistols, fail to effectively prevent unintended discharge, as they often require user input and are not integrated into the firearm's mechanical structure, leading to potential accidental firings during use or carrying.
Innovation Solution
A slotted trigger actuation mechanism is introduced, where a slot in the trigger bar delays the onset of trigger bar motion and a trigger bias mechanism requires a significant pull force, increasing the trigger travel distance before the firearm can discharge, thereby reducing the likelihood of unintentional firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional direct-coupling trigger interface is used, then the trigger mechanism is simple and responsive, but unintended discharge occurs more easily due to insufficient trigger travel distance
Solution Approach 1:
The trigger interface is segmented into multiple functional zones: a slot portion that allows initial trigger movement without sear disengagement, and a release portion that eventually engages the sear. This segmentation separates the trigger travel into distinct phases, preventing unintended discharge while maintaining mechanical simplicity
Solution Approach 2:
The slot acts as an intermediary element between the trigger and sear, mediating the trigger's rearward motion. During initial trigger travel, the slot allows movement without transferring force to the sear, effectively decoupling the trigger motion from sear engagement until the trigger reaches the release portion
2Reliability
If the trigger travel distance is increased to prevent accidental firing, then firearm safety improves, but the trigger response time and shooting speed decrease
Solution Approach 1:
The slot geometry is designed to dynamically adjust the mechanical coupling between trigger and sear during trigger travel. Initially, the slot provides dynamic freedom of movement without sear engagement, then transitions to rigid coupling at the release portion, optimizing both safety and response speed
3Reliability
If a slotted trigger interface is implemented to require increased trigger travel, then unintended discharge is reduced, but the trigger mechanism complexity increases
Solution Approach 1:
The slot and release portions are merged into a single integrated trigger interface component, combining multiple safety functions into one element. This integration maintains manufacturing simplicity while achieving the safety benefits of increased trigger travel and controlled sear engagement
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 slotted trigger actuation mechanism significantly reduces the risk of unintentional discharge by requiring increased trigger travel and opposing forces, enhancing firearm safety and meeting drop safety standards such as SAAMI, NATO EPVAT, and German standards.
Implementation Method 1
a trigger bias configured to bias the trigger body towards the resting position, the trigger bias is a spring disposed between a trigger stop on the firearm receiver and a proximal portion of the trigger body
Data Source
AI summary
An apparatus and method for a slotted trigger actuation mechanism for a firearm are described herein. The slotted trigger actuation mechanism may be a slotted trigger bar interface. The slotted trigger bar interface may serve to increase a distance of trigger pull required to execute firing ammunition. A trigger body may comprise a trigger bias for increasing trigger work. The apparatus and method described herein may help to improve results during drop safety testing.