Dual Mode Trigger Mechanism for Semi-Automatic Firearms
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Solution Overview
Problem
Existing solutions for increasing the firing rate of semi-automatic firearms are either non-intuitive, require complex installations, or fail to prevent 'hammer follow' issues, leading to potential classification as machine guns and compatibility issues with popular rifle systems like AR-15 and AR-10.
Innovation Solution
A selectable trigger system with a primary disconnector, secondary disconnector, selector cam, selector lever, and detent spring that allows easy transition between two modes of fire, preventing 'hammer follow' and being compatible with forward hammer engagement systems, using a mechanical design that doubles the firing rate without additional installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a device is installed to convert a standard trigger to fire on both pull and release, then the firing rate is doubled, but the device requires installation and removal to switch between modes and is not compatible with forward hammer engagement systems
Solution Approach 1:
The trigger system employs a dynamic selector switch that can be positioned in either a first position (semiautomatic mode) or a second position (double fire mode). This dynamic configuration allows the same trigger assembly to adapt its functionality based on the selector position, enabling compatibility with different firing modes without requiring separate devices for each mode or trigger system type.
Solution Approach 2:
The trigger assembly is designed with universal compatibility for forward hammer engagement systems through the use of a disconnector that can engage with the hammer in multiple configurations. The selector switch mechanism allows a single device to perform multiple functions: semiautomatic firing, double fire mode, and easy mode, making it adaptable to different operational requirements without requiring separate specialized devices.
2Productivity
If the trigger is held in a central position in double fire mode, then the hammer can follow the bolt assembly forward, but this results in multiple rounds fired with one trigger function
Solution Approach 1:
A disconnector component serves as an intermediary between the trigger and hammer, preventing direct engagement that would allow hammer follow. The disconnector includes a disconnector surface that interfaces with the hammer, and its movement is controlled by the selector switch. In double fire mode, the disconnector prevents the hammer from following the bolt assembly forward by maintaining proper engagement geometry, thus preventing unintended multiple rounds while still allowing the double fire functionality.
Solution Approach 2:
The trigger system incorporates preliminary anti-action through the selector switch configuration that prevents improper hammer engagement before it can occur. When the selector is in the second position (double fire mode), the geometry of the disconnector and trigger surfaces is pre-configured to ensure the hammer cannot follow the bolt assembly forward, even if the trigger is held in a central position. This preliminary prevention eliminates the risk of unintended automatic fire.
3Productivity
If a mechanical crank or slide device is used to manipulate the trigger quickly, then the firing rate increases, but the operation becomes non-intuitive and accurate fire is difficult to maintain
Solution Approach 1:
The trigger system allows the operator to manually control the firing rate through the selector switch and trigger manipulation without requiring additional mechanical assistance devices. The system serves itself by using the operator's direct input on the trigger and selector to achieve the desired firing mode, eliminating the need for external crank or slide devices that would complicate the operation and reduce intuitiveness.
Data Source
AI summary
One embodiment of a trigger system with an integral selector for semi-automatic firearms. A selector allows the user to choose between two modes and rates of fire. A trigger (1) is made to allow passage of the lower portion of a selector cam (5) to the exterior of the firearm. A selector lever (6) is affixed to the lower end of the selector cam (5) on the exterior of the firearms action. Turning the selector lever (6) rotates the selector cam (5) which tilts a pivotal disconnector (3) on its axis, varying the amount of disconnector (3) engagement with a hammer (2). The variance in the disconnector (3) engagement causes the firearm to fire in one of two modes, firing one round with a trigger pull and resetting with trigger release, or firing one round with trigger pull, and firing another round with trigger release. Other embodiments are described.