Firearm Trigger Assembly Shroud Mechanism
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Solution Overview
Problem
Semi-automatic firearms require continuous trigger finger engagement, leading to regulatory classification as machine guns, necessitating a mechanism to force the user's finger off the trigger between shots.
Innovation Solution
A trigger assembly with a shroud element and link system that moves to disable the trigger finger pad after each shot, ensuring the user's finger is forced off the trigger, utilizing a pivotally connected frame, hammer, and disconnector to reset the trigger assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the trigger assembly maintains continuous trigger finger engagement between shots, then the operation is simplified and faster, but the firearm is classified as a machine gun under regulatory definitions
Solution Approach 1:
The trigger assembly is segmented into two separate functional elements: a trigger element for hammer release and a shroud element for finger engagement. This segmentation allows the finger engagement function to be mechanically separated from the trigger release function, enabling the shroud element to force finger disengagement while the trigger element remains independently operable only when the shroud is in the enabling position.
Solution Approach 2:
The shroud element acts as an intermediary mechanism between the user's finger and the trigger element. It mediates the finger's ability to engage the trigger by physically blocking access to the trigger element when in the disabling position, thereby preventing continuous engagement while allowing discrete shot-by-shot operation.
2Reliability
If a shroud element and link system are added to force finger disengagement, then compliance with semi-automatic firearm regulations is achieved, but the device complexity increases
Solution Approach 1:
The shroud element combines multiple functions into a single component: it serves as both the finger engagement surface and the mechanical blocker of the trigger element. The link mechanism merges the reciprocating action element's motion with the shroud element's positioning, allowing one moving part to control the enabling/disabling state without requiring separate actuators.
Solution Approach 2:
The shroud element performs multiple functions: it provides the finger engagement surface for trigger operation, acts as a physical barrier to prevent continuous engagement, and serves as a positioning mechanism that enables or disables trigger element access. This multi-functionality reduces the need for additional dedicated components.
3Reliability
If the shroud element is positioned to disable the trigger finger pad, then continuous trigger function is prevented, but the ease of operation is reduced
Solution Approach 1:
The shroud element transitions dynamically between two positions: the disabling position that blocks trigger access and the enabling position that allows finger engagement. This dynamic repositioning, driven by the reciprocating action element through the link mechanism, automatically adapts the trigger assembly's operability based on the firearm's cycle state without requiring manual intervention.
Solution Approach 2:
The trigger assembly's own reciprocating action element drives the shroud element's movement between enabling and disabling positions. The system uses its own operational cycle to automatically control access to the trigger, eliminating the need for external control mechanisms or additional power sources.
Data Source
AI summary
A trigger assembly for a firearm has a frame, a trigger element pivotally connected to the frame and having a trigger lever operable for movement between a forward released position and a rearward actuated position, a hammer pivotally connected to the frame and movable between a cocked position and a striking position, a shroud element pivotally connected to the frame and having a shroud lever operable for movement between a forward disabling position and a rearward enabling position, a link pivotally connected to the frame and having a first portion operably interfacing the reciprocating action element and a second portion operably interfacing the shroud element, and the link being operable when the reciprocating action element moves from the rear recoil position to the forward battery position to motivate the shroud element from the rearward enabling position to the forward disabling position.