Drop Pendulum Trigger Assembly for Firearm Inertial Safety
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Solution Overview
Problem
Firearm fire control mechanisms often compromise between safety and trigger sensation, with increased safety leading to decreased trigger feel and vice versa, and existing designs may not effectively prevent accidental discharges under inertial forces.
Innovation Solution
A trigger assembly with a sear, trigger, and drop pendulum, where the sear has a stop surface and contact surface, and a pendulum spring biases the trigger cam into engagement with the trigger, enhancing safety and trigger feel by preventing accidental discharges through a stable engagement mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety mechanisms are increased in firearm fire control, then safety is improved, but trigger sensation deteriorates
Solution Approach 1:
The trigger assembly is divided into functionally independent components: the trigger body, the sear, and the drop pendulum. This segmentation allows each component to perform its specific function optimally - the trigger provides sensation, the sear provides safety through dual-stage engagement, and the drop pendulum provides inertial safety - while collectively resolving the contradiction between safety and trigger sensation.
Solution Approach 2:
The drop pendulum acts as an intermediary component between the trigger and the sear mechanism. It mediates the engagement and disengagement processes, providing inertial stability to prevent accidental discharge while allowing the trigger to maintain its sensation characteristics. The pendulum's mass and geometry create a mechanical intermediary that decouples the safety function from the trigger pull characteristics.
2Reliability
If trigger pull weight is increased to improve safety, then accidental discharge is reduced, but trigger feel deteriorates
Solution Approach 1:
The drop pendulum introduces dynamic inertial properties to the trigger assembly. During normal trigger operation, the pendulum's mass and movement characteristics create a stable engagement that prevents accidental discharge without requiring increased static trigger pull weight. The dynamic inertial forces during firing cycle maintain safety while preserving light trigger pull characteristics for deliberate firing.
Solution Approach 2:
The invention changes the parameters of the trigger assembly by adding the drop pendulum with specific mass, geometry, and mounting characteristics. These parameter changes create inertial stability that prevents accidental discharge independent of trigger pull weight, allowing the trigger pull weight to remain low for good trigger feel while safety is maintained through the pendulum's inertial properties.
3Reliability
If a two-stage trigger mechanism is used to improve safety, then accidental discharge is prevented, but shooter objection increases due to complex feel
Solution Approach 1:
The invention extracts the safety function from the traditional two-stage trigger mechanism and places it in the drop pendulum component. This extraction allows the trigger itself to maintain a simple, single-stage feel that shooters accept, while the separate drop pendulum provides the safety function through its inertial stability and engagement characteristics, eliminating the need for complex two-stage trigger sensations.
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 solution improves both safety and trigger sensation by stabilizing the trigger assembly, preventing accidental discharges under inertial forces, and maintaining a suitable trigger pull weight, thus addressing the trade-off between safety and feel in firearm designs.
Implementation Method 1
A pendulum spring is positioned between the trigger and the drop pendulum for biasing the trigger cam into engagement with the trigger
Implementation Method 2
the stop surface is angularly oriented relatively to a line of motion of the reciprocating component to permit the reciprocating component to pivot the sear about the sear fulcrum
Data Source
AI summary
A trigger assembly has a sear with a stop surface engageable with a reciprocating component for holding the reciprocating component in a cocked configuration. A trigger is movable into and out of engagement with the sear to hold and release the reciprocating component. A drop pendulum has a trigger cam engageable with the trigger. A spring acts between the trigger and the drop pendulum to bias the trigger cam into engagement with the trigger. The drop pendulum also has a head cam follower engageable with the reciprocating component. Motion of the reciprocating component acting through the head cam follower and the trigger cam forces the trigger to return to a configuration of engagement between the trigger and the sear. Use of the drop pendulum improves the stability of trigger mechanisms and effectively inhibits accidental discharge of firearms when subjected to inertial forces which occur when the firearm is dropped.