Two-Piece Trigger Assembly with Integrated Spring
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Solution Overview
Problem
Existing firearm trigger assemblies are complex and time-consuming to install and service, with separate components like the trigger, spring, and trigger bar requiring additional assembly steps and space within the frame.
Innovation Solution
A two-piece trigger assembly with a spline connection and integrated trigger spring that forms a mounting mechanism, allowing for press-fit engagement and reduced impact on frame connections, integrating the trigger bar into the mounting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional unitary trigger assembly is used, then the structure is simple, but the installation and service process is complex and time-consuming requiring disconnection of multiple interconnections
Solution Approach 1:
The trigger assembly is divided into two separate pieces: a trigger bar and a trigger. The trigger bar remains permanently mounted to the frame, while the trigger can be independently removed and reinstalled. This segmentation allows the trigger to be serviced separately without disconnecting the trigger bar from the frame, significantly simplifying installation and maintenance while maintaining structural integrity.
2Reliability
If the spring is provided as a separate mechanism, then the trigger and spring are independently functional, but this separation results in additional assembly time and space requirements
Solution Approach 1:
The spring is integrated into the trigger assembly rather than being a separate mechanism. The spring is positioned within the trigger bar and works in conjunction with the trigger to provide biasing force. This merging eliminates the need for separate spring attachment steps and reduces the space required, while the spring maintains its independent biasing function through its integration with the trigger bar's mounting structure.
3Adaptability or versatility
If multiple separate functional units (trigger bar, trigger, spring) are used, then each component has dedicated functionality, but this results in complexity and additional assembly steps
Solution Approach 1:
The assembly is segmented such that the trigger bar with integrated spring remains permanently mounted to the frame, while only the trigger itself requires installation and removal. This segmentation maintains the specialized functions of each component (trigger bar for mounting, spring for biasing, trigger for actuation) while dramatically reducing assembly steps and improving productivity by eliminating the need to disconnect and reconnect multiple components during servicing.
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
Simplifies the installation and service of the trigger assembly, reduces complexity, and minimizes space requirements within the firearm frame while maintaining effective biasing and actuation functionality.
Implementation Method 1
The spring biases the trigger into a resting position so that, when the trigger is moved toward the firing position, the spring compresses linearly. When the trigger is released, the stored energy in the spring returns the trigger to the resting position.
Data Source
AI summary
A trigger assembly for a firearm includes a trigger and a trigger spring. The trigger assembly is mounted and retained in a frame of the firearm and, more specifically, in an elongated recess defined by the frame. The frame further defines lateral annular grooves and retaining lips near an opening of the elongated recess. The trigger includes an upper trigger piece and a lower trigger piece that are connected to each other. The upper trigger piece is mounted to the lateral annular grooves and retained by the retaining lips. The lower trigger piece is configured to fit in the opening and protrude from the frame. The trigger assembly also includes a trigger spring, mounted in a spring recess defined in the upper trigger piece, that spring biases the trigger into a resting position by abutting and engaging a trigger bar of the firearm under a torsional compression.