Firearm Trigger Cam Surface for Tactile Feedback
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Solution Overview
Problem
Existing firearm trigger designs fail to provide a positive tactile indication of trigger break, leading to subtle feedback for shooters, especially in low-weight trigger groups where the change in trigger weight after hammer release is minimal.
Innovation Solution
Incorporating a cam surface on the hammer that contacts the trigger after break, biasing the trigger and altering its rotational direction, which changes the perceived feel by temporarily unloading the trigger spring force, enhancing tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If lighter weight hammer and trigger springs are used to reduce trigger pull weight, then trigger pull weight is reduced, but tactile feedback at trigger break becomes too subtle to indicate hammer fall
Solution Approach 1:
The patent introduces a cam surface as an intermediary mechanism between the hammer and trigger. When the hammer falls, the cam surface contacts the trigger and provides a distinct tactile indication of break. This mediator amplifies the feedback sensation without requiring heavier springs, thus resolving the contradiction between reduced pull weight and adequate tactile feedback.
2Force
If more springs are added to reduce trigger weight, then trigger pull weight is reduced further, but the change in perceived trigger weight after hammer release becomes minimal
Solution Approach 1:
The cam surface interaction creates a mechanical sensation during trigger break. As the hammer falls and the cam surface contacts the trigger, it produces a distinct tactile impulse that provides clear feedback to the shooter. This mechanical interaction compensates for the reduced weight change sensation, ensuring the shooter receives adequate information about hammer fall.
3Ease of operation
If trigger pull weight is reduced to enhance trigger feel, then lighter pull is achieved, but the tactile indication of break becomes indistinct
Solution Approach 1:
The cam surface serves as a mediator that enhances the tactile indication of break. When the hammer falls, the cam surface geometry creates a specific contact point on the trigger that produces a distinct sensation. This intermediary mechanism makes break detection easier even with reduced pull weight, resolving the contradiction between improved trigger feel and detectability of break.
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 cam surface design significantly improves the tactile feedback at trigger break, providing a more distinct and positive sensation for the shooter, enhancing the overall trigger feel and user experience.
Implementation Method 1
The hammer includes a cam surface. The hammer is moveable from a first position to a second position upon break of the trigger, and the cam surface contacts the trigger in the second position. Desirably, the cam is arranged to bias the trigger.
Data Source
AI summary
In some embodiments, a trigger group comprises a trigger arranged to pivot on a trigger axis and a hammer arranged to pivot on a hammer axis. The hammer includes a cam surface. The hammer is moveable from a first position to a second position upon break of the trigger, and the cam surface contacts the trigger in the second position. Desirably, the cam is arranged to bias the trigger.