Multi-Stage Rifle Trigger Mechanism with Adjustable Bias
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Solution Overview
Problem
Existing trigger mechanisms for rifles are limited to single-stage or two-stage operation with narrow ranges of trigger pull weights and travel, requiring removal of the receiver or trigger to make significant adjustments, which does not accommodate individual user preferences for trigger pull resistance.
Innovation Solution
A multi-stage trigger mechanism with a trigger housing, side plate elements, a sear pivotally mounted between these elements, a sear block, and a trigger lever that rotates to engage the sear block, allowing for adjustable resistance levels through bias elements and set screws, enabling a two-stage pull with customizable resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-stage or two-stage trigger mechanisms are used, then the trigger mechanism is simple in structure, but the range of trigger pull weights and travel is limited and cannot accommodate individual user preferences
Solution Approach 1:
The trigger mechanism is divided into multiple independent stages with separate adjustment capabilities. Each stage can be independently adjusted for pull weight and travel distance, allowing customization without requiring complete redesign of the trigger system. The segmentation enables flexible configuration to match user preferences while maintaining a manageable structural complexity.
Solution Approach 2:
The trigger mechanism incorporates adjustable bias elements that allow dynamic modification of trigger pull characteristics. The ability to change spring tension and geometric parameters enables the system to adapt to different user preferences for trigger pull weight and travel, transforming a static mechanism into a dynamically adjustable one.
2Adaptability or versatility
If significant changes in trigger weight or pull travel are made, then user preference accommodation is improved, but the receiver or trigger must be removed which increases operation complexity
Solution Approach 1:
The trigger mechanism is designed with user-accessible adjustment features that allow shooters to modify trigger pull characteristics without requiring disassembly of the receiver or trigger assembly. The self-service capability enables users to perform adjustments themselves in the field, eliminating the need for complex removal and reinstallation procedures.
3Reliability
If a two-stage pull is implemented, then safety is improved without traditional safety mechanism, but the trigger mechanism complexity increases
Solution Approach 1:
The two-stage trigger pull is achieved through segmentation of the trigger mechanism into distinct functional stages. The first stage handles the initial trigger movement with one set of mechanical interactions, while the second stage handles the final release with different mechanical interactions. This segmentation provides inherent safety through mechanical design rather than separate safety components.
Solution Approach 2:
The trigger mechanism components serve multiple functions: the bias elements provide both the two-stage resistance characteristics and the safety function simultaneously. The sear and trigger lever assembly performs both the firing release function and the safety interlock function, eliminating the need for separate safety mechanisms while maintaining reliability.
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 multi-stage trigger mechanism allows for customizable trigger pull resistance, enhancing user safety and accuracy by providing a clear indication of readiness to fire without a traditional safety mechanism, accommodating individual preferences through adjustable bias elements and set screws.
Implementation Method 1
The adjustment of the compression or tension forces in the spring opposing the movement of the trigger will provide an adjustment in resisting force of the trigger to the pulling action
Implementation Method 2
The distal portion supports the weight of the sear and the force associated with the sear spring to prevent the sear from falling until desired
Implementation Method 3
the force associated with the sear spring
Data Source
AI summary
A trigger mechanism for a firearm is presented. The trigger mechanism has a trigger housing, a sear, a sear block and a trigger lever. Actuation of the trigger causes the trigger lever to rotate and eventually come into contact and move the sear block, which permits the sear to fall and permit the actuation of the firing mechanism.