Trigger Assembly Calibration for Repeatable Pull Force
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Solution Overview
Problem
Current trigger systems for AR Platform firearms lack accuracy and repeatability in adjusting and fixing the trigger pull force, making it difficult to achieve consistent and precise settings.
Innovation Solution
A trigger assembly with a housing and an adjustment fastener that allows for precise calibration and adjustment of trigger spring length, using a calibrated force tester and a laser-etched scale for accurate and repeatable pull force settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a screw mechanism is used to adjust trigger pull force, then the trigger pull force can be adjusted, but the adjustment cannot be repeated with accuracy within 1 oz
Solution Approach 1:
The patent implements a feedback mechanism by incorporating a scale with indicators that provide visual feedback to the user during adjustment. The scale shows the relationship between screw rotation and spring compression, allowing the user to see exactly how much the spring is being compressed and thereby achieve precise, repeatable pull force settings within 1 oz accuracy.
Solution Approach 2:
The patent replaces the purely mechanical screw mechanism with a hybrid system that combines mechanical adjustment with optical/visual measurement. The scale and indicators provide a measurement system that transforms the invisible mechanical compression into visible quantitative information, enabling precise control without requiring expensive force testers.
2Adaptability or versatility
If an adjustment screw mechanism is moved from its initial position, then the pull force can be changed, but it is impossible to return to the initial position with accuracy
Solution Approach 1:
The scale with indicators provides continuous visual feedback that shows the current position of the adjustment screw relative to the spring compression. This feedback allows the user to identify and return to the initial calibration position with high accuracy, ensuring repeatability of the original pull force setting.
Solution Approach 2:
The patent uses visual indicators on the scale that provide clear visual cues for position identification. These indicators allow the user to easily recognize the initial calibration position and return to it accurately, maintaining the stability of the calibrated state.
3Manufacturing precision
If multiple variables affecting pull force are controlled, then consistent pull force can be achieved, but it becomes expensive and time consuming
Solution Approach 1:
The patent changes the approach from controlling multiple manufacturing variables to controlling a single adjustable parameter (spring compression length). By providing a mechanism to precisely adjust and set the spring compression after assembly, the system achieves consistent pull force without requiring tight manufacturing tolerances on multiple components, thereby reducing manufacturing cost and time.
Solution Approach 2:
The patent performs the pull force calibration as a preliminary action during the assembly process. The scale and indicator system allow calibration to be done quickly and accurately before the trigger is shipped, ensuring consistency without requiring expensive post-manufacturing testing equipment or multiple adjustment steps.
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
Enables trigger pull force adjustments with 1 oz accuracy, ensuring consistent and repeatable settings for fixed or adjustable pull forces.
Implementation Method 1
utilize a combination of a screw mechanism and springs to adjust the pull force of the trigger
Data Source
AI summary
A trigger assembly and associated method for use for the adjustment of trigger pull force of a firearm. The trigger assembly having a housing with an adjustment means in the form of a fastener in communication with one or more trigger springs that interface with a trigger. The adjustment means can be configured to adjust a length of one or more trigger springs to adjust the trigger pull force of the trigger assembly. A calibrated force tester can be coupled to a portion of the trigger to test the amount of trigger pull force necessary to release a hammer of the trigger assembly. The trigger assembly enables a calibrated repeatable method of giving a user the ability to adjust the trigger system pull force by the means of a calibrated laser etched scale on the trigger housing that works in conjunction with the adjustment means.