Firearm Sear Mechanism EDM Contact Surfaces
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Solution Overview
Problem
The operation of firearm trigger mechanisms can lead to reduced accuracy due to excessive force required to pull the trigger and unpredictable hammer release points, causing mechanical distractions and frustration.
Innovation Solution
A sear mechanism for firearms is developed, featuring a trigger element with contact surfaces created using electric discharge machining, which includes a housing, pivotally connected trigger and disconnector elements, and a hammer element with biasing mechanisms to provide a smooth, two-stage trigger operation, enhancing controllability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing processes are used for trigger element contact surfaces, then manufacturing simplicity is maintained, but trigger operation smoothness and shooting accuracy deteriorate due to rough or uneven surfaces
Solution Approach 1:
The patent applies electric discharge machining (EDM) to fundamentally change the manufacturing process parameters for creating contact surfaces. This process uses electrical discharges to erode material, achieving extremely smooth and precise contact surfaces that traditional mechanical machining cannot produce, thereby resolving the contradiction between manufacturing precision and ease of manufacture
Solution Approach 2:
The patent replaces traditional mechanical machining processes with electric discharge machining. This substitution eliminates mechanical tool contact and cutting forces that cause surface irregularities, producing exceptionally smooth contact surfaces through non-contact electrical erosion, thus improving trigger operation smoothness without significantly increasing manufacturing complexity
2Reliability
If excessive force is applied to the trigger mechanism, then reliable hammer release is achieved, but shooting accuracy deteriorates due to mechanical distractions and shooter tension
Solution Approach 1:
The patent applies local quality by creating specially optimized contact surfaces at specific locations where components interact. The electric discharge machining process produces locally enhanced smoothness and precision at the trigger sear contact points, reducing friction and mechanical distractions exactly where needed, thereby maintaining reliable hammer release while improving shooting accuracy
Solution Approach 2:
The patent implements preliminary action by pre-configuring the contact surfaces with optimal geometry and finish through EDM before the trigger is operated. The contact surfaces are precisely formed in advance to ensure smooth engagement and disengagement, eliminating the need for excessive force during actual trigger operation and thereby improving both reliability and 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
The sear mechanism improves shooting accuracy by minimizing mechanical distractions and providing a consistent, reliable trigger pull, allowing for precise control of the firearm.
Implementation Method 1
electric discharge machining the intermediate workpiece of the trigger element to provide at least one contact surface
Data Source
AI summary
A sear mechanism for a firearm includes a trigger element having one or more contact surfaces on which one or more movable or pivotable components of the sear mechanism selectively contacts or slides. In some embodiments, the trigger element is made by producing an intermediate workpiece of the trigger element by a manufacturing process, and electric discharge machining the intermediate workpiece of the trigger element to provide the contact surfaces.