Modular Trigger Assembly with Needle Bearings for AR-15
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Solution Overview
Problem
Stock triggers in AR-15 style rifles often suffer from accuracy-robbing characteristics such as excessive trigger take-up and grit accumulation, leading to inconsistent trigger let-off and reduced accuracy.
Innovation Solution
A drop-in modular trigger assembly featuring needle bearing supported pivot points, an adjustable sear, a hammer with safety notches, and dual trigger configuration, designed for easy installation without special tools or gunsmithing experience, incorporating a specially wound double torsion spring and needle roller bearings for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stock trigger assembly is used in an AR-15 rifle, then the rifle can be manufactured and assembled easily, but the trigger exhibits accuracy-robbing characteristics such as excessive trigger take-up and inconsistent trigger let-off
Solution Approach 1:
The trigger assembly is divided into separate modular components including the trigger body, hammer, sear, disconnector, and spring assembly. This segmentation allows each component to be independently optimized for precision while maintaining ease of assembly through standardized interfaces in the lower receiver.
Solution Approach 2:
The trigger assembly incorporates adjustable parameters including trigger pull weight, sear engagement depth, and hammer spring tension. These parameter adjustments enable customization of trigger characteristics to achieve consistent let-off and reduced take-up while maintaining manufacturing feasibility.
2Reliability
If a conventional trigger mechanism is used, then the design is simple, but grit accumulates in the trigger mechanism causing trigger creep
Solution Approach 1:
The disconnector component is extracted and designed as a separate element that actively manages grit and debris by directing it away from critical engagement surfaces between the sear and hammer. This extraction prevents grit accumulation that would otherwise cause trigger creep while adding minimal complexity to the overall mechanism.
Solution Approach 2:
A lubrication channel system acts as an intermediary between the trigger components, providing continuous lubricant delivery to critical surfaces. This intermediary system prevents grit adhesion and maintains consistent trigger operation without requiring complex sealing or protection mechanisms.
3Productivity
If a standard trigger assembly is installed, then no special tools or gunsmithing experience is needed, but the trigger pull effort is excessive and firing rate is reduced
Solution Approach 1:
The hammer spring is designed with optimized tension characteristics that dynamically adjust during the trigger pull cycle. The spring provides progressive resistance that reduces perceived pull effort while maintaining sufficient force for reliable hammer release, thereby increasing firing rate without requiring reduced trigger force.
Solution Approach 2:
The trigger assembly incorporates adjustable spring tension and sear engagement parameters that can be optimized to reduce trigger pull effort. By adjusting these parameters, the system achieves lighter pull weight for increased firing rate while maintaining reliable engagement through proper geometric design.
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
Enhances firing accuracy, reduces trigger pull effort, increases firing rate, and improves ammunition utilization by providing a direct replacement that can be installed in under an hour without specialized skills, offering a safer and more precise shooting experience.
Implementation Method 1
needle bearing supported pivot points
Implementation Method 2
needle roller bearings
Implementation Method 3
specially wound double torsion spring
Data Source
AI summary
Trigger assembly for use in a weapon. Components of the trigger assembly include a spring, a hammer, a disconnector, a trigger and other components related to a trigger assembly.