Firearm Trigger Mechanism Preventing Drop Fires
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Solution Overview
Problem
Firearms with light trigger pulls are prone to drop fires due to sensitivity to shocks, which increases the risk of accidental discharge when dropped, especially at lower drop heights.
Innovation Solution
A trigger mechanism design that includes a sear connector and second trigger with a concave surface, along with a safety lever system, to prevent accidental discharge by ensuring the sear connector remains engaged even under inertial forces, using a geometrical arrangement that maintains contact and prevents pivoting motion unless intentionally triggered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the trigger pull is made light to improve shooting accuracy, then the marksman can shoot more accurately, but the firearm becomes more sensitive to shocks and more susceptible to drop fires
Solution Approach 1:
The trigger mechanism is divided into two separate triggers: a first trigger for normal firing operation and a second trigger as a safety mechanism. The second trigger with its lobe engages a second side of the sear connector to prevent inadvertent discharge, while the first trigger maintains light pull for accuracy. This segmentation allows each trigger to specialize in its function without compromise.
Solution Approach 2:
The second trigger is positioned and configured to engage the sear connector before the first trigger can inadvertently release it due to shock. The lobe on the second trigger proactively blocks the sear connector's pivoting motion, preventing drop fires before they can occur. This preliminary safety engagement maintains the light first trigger pull while adding protective action.
2Measurement precision
If the trigger pull is reduced to enhance accuracy, then shooting precision improves, but the tendency to drop fire increases and occurs more frequently at lower drop heights
Solution Approach 1:
The second trigger acts as an intermediary safety mechanism between the external environment (shocks, drops) and the firing mechanism. Its lobe engages the second side of the sear connector, mediating the effect of inertial forces by preventing the sear connector from pivoting inadvertently. This intermediary protection allows the first trigger to remain light for precision while blocking harmful shock transmission.
Solution Approach 2:
The solution adds a dimensional layer of safety by introducing a second trigger that operates independently from the first trigger's light pull mechanism. The second trigger's lobe engages a different side of the sear connector, creating a redundant engagement path that specifically addresses shock resistance without interfering with the precision-oriented first trigger.
3Reliability
If a safety mechanism is added to prevent drop fires, then reliability improves, but the device complexity increases
Solution Approach 1:
The second trigger serves multiple functions: it acts as a safety mechanism against drop fires, maintains engagement with the sear connector during normal operation, and can be integrated into the existing trigger guard structure. By making the second trigger multi-functional, the design achieves enhanced reliability without proportionally increasing complexity.
Solution Approach 2:
The second trigger and its lobe are integrated into the existing trigger mechanism structure, sharing common components such as the trigger guard and pivot points. The lobe on the second trigger merges with the sear connector's second side engagement surface, creating a unified safety system that adds protection without requiring entirely separate components.
Data Source
AI summary
A trigger mechanism has a first trigger which engages a sear connector and a second trigger, pivotably mounted on the first trigger, which supports the sear connector. The sear connector supports a sear, which holds a firing pin in the cocked position via a cocking piece. To discharge the firearm both triggers must be pulled. A safety lever has a hook which engages the second trigger and a projection which engages a spur on the first trigger when the lever is in the safe position.