Firearm Trigger Assembly with Rotating Levers
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Solution Overview
Problem
Existing trigger assemblies for firearms, particularly bolt-action rifles, face challenges in balancing safe and reliable operation with accidental discharge prevention, accuracy, and maintenance accessibility due to increased friction and component overlap, which can lead to heavy trigger pull, uneven pull, and premature wear.
Innovation Solution
The trigger assembly design incorporates a housing with rotating levers and adjustment screws that allow for selective restraint of the firing pin, a safety mechanism with multiple points of interference, and a compact safety lever configuration to prevent accidental discharge, while maintaining ease of maintenance and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction and overlap between trigger assembly components are increased to securely restrain the firing pin and prevent accidental discharge, then safety is improved, but trigger pull weight increases and trigger pull becomes rough and uneven
Solution Approach 1:
The trigger assembly is divided into multiple separate components (trigger, sear, firing pin, spring) that interact through controlled mechanical engagement. This segmentation allows each component to be optimized independently - the sear and trigger can be designed with specific geometries that provide reliable restraint while maintaining smooth operation, rather than relying on high friction between large overlapping surfaces.
Solution Approach 2:
The trigger assembly uses dynamic mechanical engagement where the sear lever rotates on a pin to engage and disengage from the trigger. This dynamic rotational movement provides secure restraint during normal operation while allowing controlled, smooth release when the trigger is pulled, eliminating the need for high static friction that would cause rough operation.
2Reliability
If friction and overlap between trigger assembly components are increased to securely restrain the firing pin, then accidental discharge prevention is improved, but trigger assembly wear increases
Solution Approach 1:
By segmenting the trigger assembly into discrete components with point or line contact rather than large surface overlap, the mechanical stress and wear are concentrated on small, easily replaceable surfaces. The sear and trigger components can be designed with hardened contact surfaces that resist wear while maintaining secure engagement, extending service life without compromising safety.
Solution Approach 2:
The design replaces friction-based restraint with geometry-based mechanical engagement. The sear lever's L-shaped configuration and its engagement with the trigger create a mechanical lock that relies on precise geometric fit rather than friction, significantly reducing wear while maintaining reliable accidental discharge prevention.
3Reliability
If trigger assembly components are designed with increased overlap to restrain the firing pin, then safety is improved, but the distance through which the trigger must be pulled increases
Solution Approach 1:
The rotational movement of the sear lever on its mounting pin creates a mechanical advantage that allows the trigger to be pulled a short distance while still achieving complete disengagement of the firing pin restraint. The rotation converts a small linear trigger pull into a larger angular movement of the sear, maintaining safety without increasing trigger pull distance.
Solution Approach 2:
The trigger assembly transitions from linear overlap to rotational engagement. The sear lever rotates in an arc rather than moving linearly, allowing the trigger to be pulled a short distance while the sear rotates sufficiently to release the firing pin. This dimensional change from linear to rotational movement reduces trigger pull distance while maintaining reliable restraint.
Data Source
AI summary
Trigger assemblies are provided for restraining a firing pin of a firearm on a selective basis. The triggers assemblies include a first and a second lever mounted for rotation within a housing. The first lever is configured to be rotated by the user, and rotation of the first lever imparts rotation to the second lever to initiate the discharge of the firearm. The trigger assemblies also include a safety mechanism having a safety lever that is movable between a first and a second angular position. The safety lever is configured to prevent movement of the first and second levers when the safety lever is in its first angular position, thereby preventing discharge of the firearm.