Open Design Firearm Trigger Assembly Reducing Friction
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Solution Overview
Problem
Firearm trigger assemblies face inconsistency and inaccuracy due to friction and foreign particulates, with closed designs failing to prevent particulate accumulation and complicating cleaning, leading to increased lock times and risk of component damage.
Innovation Solution
An open design override trigger assembly with three levers and a support bracket, allowing easy access and minimal friction, which prevents particulate accumulation and simplifies cleaning while maintaining or reducing lock time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed design trigger assembly is used to shield moving parts from dust, then protection from foreign particulates is improved, but foreign particulates accumulate within the housing and functionality deteriorates over time
Solution Approach 1:
The trigger assembly is divided into separate functional components (trigger lever, transfer lever, sear lever, firing pin) that can be independently accessed and cleaned. The open design allows each component to be individually serviced without disassembling a closed housing, preventing particulate accumulation while maintaining protection through strategic component layout.
Solution Approach 2:
The protective housing is removed entirely, extracting the trigger components from an enclosed space. This eliminates the particulate accumulation problem inherent in closed designs while the components themselves are positioned to minimize exposure to harmful factors during operation.
2Object-affected harmful factors
If a closed design trigger assembly is used, then protection from foreign particulates is improved, but cleaning access becomes difficult and component loss risk increases
Solution Approach 1:
The trigger assembly uses segmented, modular components that can be easily separated and cleaned individually. Each lever and component is designed as a discrete unit that can be accessed without disassembling a closed housing, making cleaning simple while maintaining protection during operation.
Solution Approach 2:
By removing the closed housing entirely, all components are extracted into an open configuration where cleaning access is immediate and straightforward. This eliminates the need to disassemble covers or housings to access cleaning surfaces.
3Device complexity
If a direct-pull trigger assembly is used, then simplicity is improved, but friction between sear pin and firing pin increases and accuracy deteriorates
Solution Approach 1:
Instead of the sear pin moving linearly perpendicular to the firing pin path (direct-pull design), the sear lever rotates about an axis that is substantially parallel to the firing pin travel path. This inverts the traditional motion geometry, allowing the sear to engage and disengage the firing pin with minimal frictional contact while maintaining a simple overall design.
Solution Approach 2:
The trigger assembly transitions from static linear contact to dynamic rotational motion. The sear lever rotates about its axis during trigger operation, creating a dynamic engagement mechanism that reduces friction compared to the static linear contact of direct-pull designs while maintaining simplicity.
4Measurement precision
If an override trigger assembly with rotation is used, then friction is reduced, but device complexity increases
Solution Approach 1:
The sear lever serves multiple functions: it engages the firing pin, rotates to control engagement timing, and provides a trigger interface. This multi-functionality reduces the need for separate components, maintaining simplicity despite the rotational mechanism. The same component that provides friction reduction through rotation also serves as the primary trigger interface.
Solution Approach 2:
The rotation axis of the sear lever is positioned and oriented differently from traditional override designs, with the axis substantially parallel to the firing pin travel path rather than perpendicular. This inverted geometry simplifies the overall mechanism by aligning rotational motion with the natural direction of firing pin movement, reducing the complexity of the rotation control system.
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 open design trigger assembly enhances accuracy and consistency by reducing friction and particulate accumulation, facilitating easy cleaning, and maintaining or reducing lock time, thereby improving overall firearm performance.
Implementation Method 1
The first lever is pivotable about a first lever axis and the first lever is biased in a first rotational direction about the first lever axis
Implementation Method 2
the third lever is prevented from rotating in a third rotational direction about the third lever axis by the contact of the lower rocker surface with the second lever
Data Source
AI summary
Provided are systems and methods related to firearm trigger assemblies. An open design trigger assembly is provided to allow easier access to the trigger action. The trigger assembly is preferably an override trigger assembly, which may include adjustable trigger travel limiter and trigger bias force. Methods according to the present invention include a first step of removing either a direct-pull or a closed design trigger assembly from a firearm and replacing such removed assembly with an open design override trigger assembly.