Firearm Trigger Mechanism with Rotatable Pivot and Rubber Sear
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Solution Overview
Problem
Conventional trigger mechanisms in firearms often have heavy trigger pull forces, which degrade accuracy and stability, particularly in competition shooting, due to the unnatural alignment of the trigger pivot and the shooter's finger path.
Innovation Solution
The proposed trigger assembly features a pivot pin located closer to the rear edge of the trigger housing, allowing for rotational movement in both vertical and horizontal planes, thus aligning with the natural curved path of the shooter's finger, and incorporating a sear with a rubber interface for smooth engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the trigger pivot is positioned in a conventional location, then the trigger mechanism is simple to manufacture, but the trigger pull force becomes heavy and degrades accuracy
Solution Approach 1:
The patent positions the trigger pivot at a specific location (closer to the rear of the trigger housing) that is optimized for accuracy rather than manufacturing simplicity. This localized change in pivot positioning creates a curved finger path that reduces trigger pull weight and improves shot accuracy, while the overall manufacturing process remains relatively simple.
2Measurement precision
If the trigger pivot is repositioned to align with the natural finger path, then trigger pull accuracy improves, but the trigger mechanism complexity increases
Solution Approach 1:
The patent utilizes a curved finger path created by the repositioned trigger pivot, which allows the shooter's finger to travel along a natural curved trajectory. This curvature in the finger path reduces the mechanical advantage that causes heavy trigger pull, thereby reducing trigger weight and improving accuracy without requiring complex additional components.
3Measurement precision
If a conventional sear interface is used, then the trigger mechanism is simple, but tactile indications and creep are noticeable
Solution Approach 1:
The patent employs a composite interface between the sear and cocking piece, combining metal surfaces with rubber or elastomeric material. This composite material approach provides both a smooth, creep-free break and reduced tactile indications, while the rubber element also dampens vibrations and reduces the perceived weight of the trigger pull.
4Reliability
If heavy trigger pull force is used for durability, then the trigger mechanism is more reliable, but accuracy and stability degrade
Solution Approach 1:
The patent changes the geometric parameters of the trigger mechanism, specifically the pivot position and finger path curvature, to reduce the trigger pull force from heavy (conventional) to lighter (optimized). This parameter change maintains sufficient force for reliable operation while reducing the excessive force that causes firearm instability and degrades accuracy.
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
This design reduces tactile indications during trigger pull, enhancing accuracy by allowing the trigger to follow the natural finger path, and providing a crisp, consistent break without noticeable creep.
Implementation Method 1
incorporating a sear with a rubber interface for smooth engagement
Implementation Method 2
incorporating a sear with a rubber interface for smooth engagement
Data Source
AI summary
A trigger assembly includes a housing a sear moveably connected to the housing; and a trigger piece connected to the housing and moveable between a cocked position and a firing position; the trigger piece including a trigger shoe configured to contact a user in moving from the cocked position to the firing position; the trigger piece being configured to rotate about a first axis of rotation and an orthogonal second axis of rotation in moving from the cocked position to the firing position.