Firearm Sear Actuator Reducing Trigger Pull Weight and Flutter
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Solution Overview
Problem
Firearms, particularly semi-automatic handguns, face issues with 'sear flutter' and trigger detachment due to loose trigger attachment pins, which affect accuracy and reliability, and existing configurations often require trade-offs between reduced sear flutter and lower maximum trigger pull weight.
Innovation Solution
A sear actuator design with an annular portion rotating about a sear fulcrum axis, featuring a trigger engagement leg and a lower tooth for camming surface contact, which reduces sear flutter likelihood while maintaining a lower maximum trigger pull weight by utilizing a sear spring weight with a y-intercept of less than 1.5, enhancing the mechanical advantage for trigger bar engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If factors are altered to reduce the probability of sear flutter, then reliability is improved, but maximum trigger pull weight increases greatly
Solution Approach 1:
The sear actuator is divided into distinct functional segments: an annular portion for rotational movement about the fulcrum axis, a trigger engagement leg with contact surface for trigger bar interaction, and a lower tooth with camming surface for sear engagement. This segmentation allows each component to be optimized independently for its specific function while working together to resolve the contradiction between reliability and trigger pull weight.
Solution Approach 2:
The sear actuator utilizes dynamic rotational movement about the fulcrum axis rather than static positioning. The annular portion rotates between different angular positions to engage and disengage the sear, creating a dynamic system that can control sear retention force through motion rather than relying solely on high spring weight, thereby reducing maximum trigger pull weight while maintaining reliability.
2Reliability
If trigger attachment pins are secured to prevent loosening, then reliability is improved, but device complexity increases
Solution Approach 1:
The sear actuator integrates multiple functions into a single unified component: it combines the trigger bar engagement surface, the camming surface for sear actuation, and the rotational fulcrum mechanism into one piece. This merging eliminates the need for separate trigger attachment pins and their associated retention features, thereby improving reliability without increasing device complexity.
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 sear actuator design significantly reduces the likelihood of sear flutter and maintains a lower maximum trigger pull weight, improving firearm reliability and user experience without increasing the force required to pull the trigger, thus enhancing accuracy and usability.
Implementation Method 1
a firearm produces a maximum pull weight attributable to the sear that is approximately linearly related to a sear spring weight
Implementation Method 2
a lower tooth extending radially outward from the annular portion and including an upward sear actuation surface configured to contact a camming surface of a sear of the firearm, whereby rotation of the sear actuator from the first pivotal position to the second pivotal position results in rotation of the sear
Data Source
AI summary
A firing mechanism for a firearm is provided for reducing maximum trigger pull weight attributable to a sear and for reducing trigger pre-travel and over-travel distances. The firing mechanism includes a sear actuator with a trigger engagement leg that engages with a trigger bar at a reduced trigger travel distance. The firing mechanism also includes an increased trigger bar contact distance, thus reducing trigger pull weight.