Firing Pin Assembly Friction Reduction via Channel and Chamfers
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Solution Overview
Problem
Firing pin assemblies in firearms often require excessive trigger force due to strong springs, leading to accuracy issues and potential malfunctions from binding between the trigger and firing pin assemblies.
Innovation Solution
A firing pin assembly with a vertically extending flange and a trigger bar member that includes a channel to reduce frictional engagement, combined with a lighter weight design featuring chamfers and indentations on the firing pin, allowing for a softer spring and smoother trigger pull.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strong spring is used to bias the firing pin, then the firing pin can reliably fire the cartridge, but excessive force is required on the trigger which reduces accuracy
Solution Approach 1:
The firing pin assembly is segmented into multiple components: the firing pin member, the flange, and the trigger bar member. This segmentation allows the spring force to be distributed and managed more effectively, reducing the trigger pull force while maintaining reliable ignition. The flange acts as an intermediate element that manages the spring force during the firing sequence.
Solution Approach 2:
The trigger bar member is designed to dynamically engage and disengage from the flange during operation. When the trigger is pulled, the trigger bar member disengages from the flange, allowing the firing pin to move forward. This dynamic engagement mechanism allows the system to transition from a high-force spring-biased state to a low-force trigger activation state, resolving the contradiction between reliable firing and easy operation.
2Reliability
If the trigger assembly engages tightly with the firing pin assembly, then the firing pin is securely restrained, but binding or inhibition occurs which retards activation and causes malfunctions
Solution Approach 1:
The engagement surface of the flange is designed with specific local qualities - a smooth surface that engages with the trigger bar member. This localized smooth surface reduces friction at the critical engagement point, allowing the trigger bar member to smoothly disengage from the flange during trigger activation, preventing binding while maintaining secure restraint when engaged.
Solution Approach 2:
The flange acts as an intermediary element between the spring-biased firing pin member and the trigger bar member. It provides a controlled engagement surface that mediates the interaction between these components, ensuring secure restraint during normal operation while allowing smooth disengagement during trigger activation, thus preventing binding and malfunctions.
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 solution results in a 20% reduction in firing pin weight, enabling a lighter trigger pull and improved accuracy by reducing the force required to activate the firing pin, while ensuring reliable primer ignition with a softer spring and reduced friction.
Implementation Method 1
a firing pin assembly which includes a firing pin member having a vertically extending flange wherein the firing pin assembly is spring biased towards a firing position
Implementation Method 2
an engagement surface of the flange that engages with the trigger bar member includes a channel to reduce the frictional engagement between the flange member and the trigger bar member
Data Source
AI summary
A firing pin assembly for a firearm having an engagement surface that has a channel in an engagement surface with a trigger bar to reduce frictional engagement with a trigger assembly. The firing pin assembly also includes chamfers to reduce weight and an elongated firing pin end piece.