Firearm Trigger Reset Assist Mechanism
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Solution Overview
Problem
The mechanical impact between the trigger bar and sear in semi-automatic firearms during trigger reset is often subtle, making it difficult for operators to ascertain when the trigger reset has occurred, as existing firearms rely solely on a trigger return spring for both forward return and lateral re-engagement, resulting in an inconspicuous reset indication.
Innovation Solution
A reset assist mechanism using a compression spring and biasing member that applies a force perpendicular to the trigger bar, enhancing the lateral displacement and re-engagement with the sear, thereby magnifying the impact resonance and providing a clearer indication of trigger reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single trigger return spring is used for both forward return and lateral re-engagement, then device complexity is reduced, but the mechanical impact during reset becomes subtle and difficult to detect
Solution Approach 1:
The trigger return function is segmented into two independent components: a trigger return spring for forward return and a biasing member with compression spring for lateral re-engagement. This segmentation allows each component to be optimized for its specific function, with the biasing member providing a distinct mechanical impact for reset detection.
Solution Approach 2:
The biasing member acts as an intermediary element between the trigger bar and sear, providing a mediating lateral force that enhances the mechanical impact during reset. This intermediary component translates the compression spring force into lateral motion that clearly indicates reset completion.
2Reliability
If the trigger bar is laterally displaced out of cooperation with the sear during forward return, then safety is improved by preventing premature firing, but the reset indication becomes less conspicuous
Solution Approach 1:
The trigger bar undergoes periodic lateral displacement during operation - displaced laterally during forward return for safety, then returned to engagement position during reset. The biasing member enhances the periodic nature of this motion by providing a noticeable mechanical impact at the end of each reset cycle, making the periodic reset event easily detectable.
3Force
If the mechanical impact between trigger bar and sear is minimized, then trigger pull weight is maintained, but operator feedback during reset becomes subtle
Solution Approach 1:
The force characteristics are made locally different at different stages of trigger operation. The trigger return spring provides gentle forward return force, while the biasing member provides a localized lateral force during re-engagement that creates a distinct mechanical impact for operator feedback, without affecting the overall trigger pull weight.
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 enhances the mechanical impact between the trigger bar and sear, allowing operators to more easily detect the trigger reset event by providing a secondary lateral force, ensuring reliable reset recognition without affecting the trigger pull weight.
Implementation Method 1
a compression spring attached proximate to a first end of the biasing member... the compression spring communicates a force through the biasing member and onto the trigger bar
Data Source
AI summary
A reset apparatus for use in a firearm, comprising: a compression spring; a biasing member has a first end and a distal end wherein the compression spring is attached proximate to the first end of the biasing member; a notch disposed on the biasing member for cooperation with a trigger bar, wherein the trigger bar comprises a longitudinal axis defined by a front portion and a rear portion, wherein the front portion is mechanically cooperated with a firearm trigger; and wherein the compression spring communicates a force through the biasing member and onto the trigger bar in a direction substantially perpendicular to the longitudinal axis of the trigger bar.