Modular Trigger Assembly with Adjustable Locking System
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Solution Overview
Problem
Aftermarket trigger assemblies for firearms, particularly AR-15 rifles, face challenges in providing adjustable and reliable trigger systems that require minimal user involvement, as existing solutions often involve complex adjustments and materials that can wear out, leading to potential misfires and safety hazards due to dimensional changes and improper geometries.
Innovation Solution
A trigger assembly with a locking system, trigger over travel adjustment, trigger take up adjustment, and safety engagement system, utilizing extendable set screws and shims to securely engage with the firearm's lower receiver, allowing for precise adjustments without altering the sear engagement surfaces, ensuring a crisp trigger break and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable trigger systems are provided with setscrews to engage the lower receiver, then adjustability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The trigger assembly is divided into modular components including the trigger housing, trigger, hammer, disconnector, and separate adjustment members. Each component can be independently adjusted or replaced, allowing complex functionality to be achieved through simple, discrete elements rather than a monolithic complex mechanism.
Solution Approach 2:
The adjustment members are designed to be self-contained with integrated adjustment mechanisms that do not require external tools or complex procedures. The setscrews directly engage with the lower receiver and trigger assembly components, allowing the system to self-adjust without requiring specialized installation equipment or procedures.
2Adaptability or versatility
If setscrews are used to provide adjustability, then adaptability is improved, but reliability deteriorates due to wear and dimensional changes
Solution Approach 1:
The adjustment members act as intermediaries between the user and the trigger assembly components. These dedicated adjustment elements are specifically designed to interface with the lower receiver and trigger components, distributing wear across specialized surfaces rather than critical sear engagement surfaces. This mediator approach protects the reliability-critical surfaces while still providing adjustability.
Solution Approach 2:
The system provides adjustability by changing the position and engagement parameters of the adjustment members relative to the lower receiver and trigger components. Rather than altering the geometry of critical sear surfaces, the system adjusts parameters such as the position of the trigger pivot, hammer pivot, and disconnector engagement points, maintaining reliable surface geometries while achieving functional adjustment.
3Measurement precision
If trigger pull weight is reduced for accuracy, then shooting accuracy is improved, but trigger over travel and take up increase
Solution Approach 1:
The system independently adjusts multiple parameters of the trigger assembly: trigger pull weight, trigger over travel, and trigger take up. By changing the engagement parameters of the disconnector and hammer relative to the trigger, the system can reduce trigger pull weight to improve accuracy while simultaneously adjusting the over travel and take up parameters to maintain acceptable operational characteristics. This multi-parameter adjustment capability resolves the trade-off between accuracy and ease of operation.
Data Source
AI summary
A trigger assembly comprising a housing adapted to mount a trigger, hammer and sear therein. The housing has an adjustment feature adapted to fixedly mount the housing within the trigger chamber portion of the firearm. The trigger assembly is particularly conducive for an AR-15 type rifle and the various sear engagement surfaces are adapted to be adjustable irrespective of the various dimensions and tolerances of the underlying firearm. A safety system is employed that adjustably allows proper engagement of the trigger tail to properly engage and disengage the safety mechanism.