Two-stage trigger arrangement
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Solution Overview
Problem
Existing fire control systems for firearms, such as AR-style and AK-style guns, vary significantly in design, leading to differences in trigger feel, shooting experience, and product longevity, with some designs being susceptible to carbon fouling.
Innovation Solution
A fire control mechanism featuring a trigger, hammer, and disconnector with rotating sears and a disconnector spring, allowing for a two-stage trigger operation with adjustable pull forces through geometric adjustments and spring load, enhancing trigger feel and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a very precise, light-pull trigger is used, then trigger feel is improved, but susceptibility to carbon fouling increases
Solution Approach 1:
The trigger mechanism is divided into two distinct stages: a first stage for initial trigger pull and a second stage for additional pull after the first stage is completed. This segmentation allows the trigger to provide precise, light pull feel during the first stage while the second stage provides additional pull force that helps clear carbon fouling and maintains reliability.
Solution Approach 2:
The trigger mechanism dynamically adjusts the pull force characteristics through two stages. The first stage provides light pull for precision, while the second stage automatically engages to provide increased pull force. This dynamic adjustment allows the trigger to adapt its characteristics based on the operational context, maintaining both precision and reliability.
2Adaptability or versatility
If different fire control designs are used, then adaptability to different gun types is improved, but consistency in trigger feel and shooting experience deteriorates
Solution Approach 1:
The two-stage trigger mechanism is designed to be universally applicable across different gun types and configurations. The mechanism provides consistent two-stage trigger feel and shooting experience regardless of whether it is installed in AR-style, AK-style, or other types of firearms, making it a universal solution that maintains adaptability while ensuring consistency in trigger feel.
3Device complexity
If traditional single-stage trigger mechanisms are used, then device complexity is reduced, but trigger feel precision and durability deteriorate
Solution Approach 1:
The trigger mechanism is segmented into two distinct operational stages with separate sear engagements. The first stage engages the first sear for initial trigger pull, and the second stage engages the second sear for additional pull. This segmentation enables enhanced trigger feel precision and durability while maintaining reasonable complexity through modular design.
Solution Approach 2:
The mechanism changes operational parameters by transitioning between two distinct sear engagement states. The first sear engagement provides one set of mechanical characteristics for the first stage, while the second sear engagement provides different characteristics for the second stage. This parameter change enables enhanced precision and durability without excessive complexity.
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 mechanism provides improved trigger feel and longevity by allowing adjustable pull forces and reducing susceptibility to carbon fouling, enhancing the overall shooting experience.
Implementation Method 1
a disconnector spring compressed while the trigger sear contacts the hammer sear
Data Source
AI summary
In some embodiments, a fire control mechanism comprises a trigger, a hammer and a disconnector. The trigger comprises a trigger sear and is arranged to rotate about a trigger axis. The hammer comprises a hammer sear and a secondary sear and is arranged to rotate about a hammer axis. The disconnector comprises a disconnector sear and is arranged to move with respect to the trigger. The fire control mechanism comprises an orientation wherein the trigger sear contacts the hammer sear and the secondary sear contacts the disconnector sear.