AR Trigger Switching Shaft for Readable Pull-Weight Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing AR-type firearm triggers lack a user-friendly mechanism for adjusting trigger pull weight without requiring additional tools or disassembly, and the set weight is not easily readable or verifiable.
Innovation Solution
A trigger mechanism with a switching shaft having varying depth steps and a Torx® drive allows for easy adjustment of trigger pull weight by rotating the shaft, with markings indicating the set weight, eliminating the need for disassembly and additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stepless trigger pull adjustment is achieved by turning an adjustment screw on the trigger mechanism, then the trigger pull weight can be adjusted continuously, but the exact trigger pull weight is not visible or discernible and requires additional measuring devices
Solution Approach 1:
The patent applies color-coded markings on the adjustment screw to indicate different trigger pull weight settings. As the user rotates the adjustment screw, the markings change color or position, providing immediate visual feedback about the current trigger pull weight setting without requiring external measuring devices.
Solution Approach 2:
The patent implements a feedback mechanism where the adjustment screw has visible markings that provide real-time information about the trigger pull weight setting. This allows the user to see the current setting immediately after adjustment, eliminating the need for separate measurement steps.
2Ease of manufacture
If trigger pull weight adjustment requires removing the trigger from the receiver, then the adjustment can be made, but the process becomes time-consuming and complex
Solution Approach 1:
The adjustment screw is designed to be accessible and functional while the trigger remains installed in the receiver. The screw is positioned such that it can be accessed through existing openings or gaps in the trigger housing, allowing users to adjust the trigger pull weight without disassembling the trigger from the receiver.
Solution Approach 2:
The trigger mechanism is designed to be self-adjustable by the user without requiring professional disassembly or special tools. The adjustment screw is positioned for easy access and the markings provide self-explanatory guidance, enabling users to perform the adjustment themselves quickly and easily.
3Adaptability or versatility
If spring replacement is used to adjust trigger pull weight, then different trigger weights can be achieved, but the springs or retaining screws can be lost during replacement and the process is time-consuming
Solution Approach 1:
Instead of replacing static springs to change trigger pull weight, the patent uses a dynamic adjustment mechanism where a single spring's tension can be varied continuously by rotating an adjustment screw. This eliminates the need to handle multiple springs and retaining screws, thereby eliminating the risk of losing parts during adjustment.
Solution Approach 2:
The patent extracts the need for multiple springs and retaining screws by implementing a single adjustable spring mechanism. The adjustment screw modifies the tension of one spring to achieve different trigger pull weights, removing the complexity and risk associated with replacing multiple spring components.
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
Enables straightforward adjustment and clear visualization of trigger pull weight without tools or disassembly, reducing the risk of unintentional discharge and simplifying the adjustment process.
Implementation Method 1
a switching shaft (18), which has a first cylindrical section (34), at least one extension (35) and a second cylindrical section (36), is rotatably and axially displaceably guided in the opening (29, 31), and wherein the switching shaft (18) is pressed with its at least one contact shoulder (37) against the step (30) or into one of the at least two shoulders of different depths by the force of a trigger spring (21)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A trigger with a stepwise adjustable trigger weight is described for weapons of the AR (3) type, which trigger is characterized in that the trigger blade (15) has at least one opening, wherein the at least one opening has a step (30), and wherein the step (30) has at least two shoulders (32) and (33) of different depths, and wherein a switching shaft (18), which has a first cylindrical section (34), at least one extension (35) and a second cylindrical section (36), is guided in the opening in a rotatable and axially displaceable manner, and wherein the switching shaft (18) is pressed with its at least one contact shoulder (37) against the step (30) or into one of the at least two shoulders (32) and (33) of different depths by the force of a trigger spring (21), which is supported on a bottom surface (23) in the trigger housing (14) or on the bottom of the housing lower part (5) of the weapon.