Multi-Stage Trigger Mechanism with Adjustable Sear Block
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Solution Overview
Problem
Current firearm trigger mechanisms 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, and lack user-specific customization for preferred pull resistance and travel.
Innovation Solution
A multi-stage trigger mechanism with a trigger housing, sear block, and trigger lever that allows for adjustable resistance stages, enabling a first stage pull with pre-selected resistance followed by additional resistance for firing, customizable through adjustment structures for optimal feel and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-stage or two-stage trigger mechanisms are used, then the trigger pull weight and travel are limited to narrow ranges, but significant changes in weight or pull require removal of the receiver or trigger
Solution Approach 1:
The trigger mechanism employs adjustable components including a sear block with variable positioning and a trigger lever with adjustable pivot points, allowing the trigger pull weight and travel to be dynamically adjusted within a wide range without requiring removal of the receiver or trigger assembly
Solution Approach 2:
The mechanism allows adjustment of critical parameters such as sear block position, trigger lever pivot location, and spring tension to change trigger pull characteristics. These parameter changes enable customization of trigger feel and performance while maintaining the same physical assembly
2Reliability
If spring resistance is increased to provide additional safety stage, then trigger pull resistance improves, but trigger travel distance increases
Solution Approach 1:
The trigger pull is divided into distinct stages: a first stage with lighter spring resistance for initial trigger movement, and a second stage with heavier resistance for firing. The sear block and trigger lever interaction creates these segmented resistance profiles, allowing safety without excessive total travel distance
Solution Approach 2:
The sear block acts as an intermediary element between the trigger lever and the firing mechanism. It provides the additional resistance in the second stage through its interaction with the trigger lever, creating a safety mechanism that doesn't require excessive trigger travel
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 precise user-adjustable trigger pull resistance and travel, enhancing safety and usability without traditional safety mechanisms, allowing for tailored performance in bolt action rifles and potentially other firearms.
Implementation Method 1
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 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
Actuation of the trigger by the user causes the trigger lever to rotate forward during a first stage
Implementation Method 4
the trigger lever will come into contact with the a portion of the sear block, causing the trigger lever to engage the sear block and move it forward
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 permits the actuation of the firing mechanism. The trigger lever may be pivotally secured to the housing at a first pivot and the sear block is pivotally secured to the housing at a second pivot. The first and second pivots may be spaced apart from each other or coincident.