Linear Trigger Mechanism Using Rolling Elements
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Solution Overview
Problem
Firearms often face a trade-off between low trigger pull weight and smoothness, which can lead to fatigue, accuracy issues, and excessive wear, while reducing contact surface sizes increases the risk of accidental discharge due to potential unintentional disengagement.
Innovation Solution
The trigger mechanism incorporates rolling elements and drop safeties to reduce friction and prevent accidental discharges, featuring a chassis with a hammer and trigger slide that utilize rolling elements to minimize friction and a drop safety system that inhibits trigger movement upon impact, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the contact surface sizes between the hammer and trigger sear are reduced to decrease trigger pull weight and improve smoothness, then the trigger pull weight decreases and smoothness improves, but the potential for unintentional disengagement increases
Solution Approach 1:
The patent applies curvature by replacing the traditional flat contact interface between the hammer and trigger sear with a spherical rolling element (ball). This rolling element contacts both the hammer and trigger sear, creating a curved surface interaction that reduces friction and allows for smaller effective contact areas while maintaining engagement reliability. The spherical geometry enables smooth rolling motion that reduces trigger pull weight without proportionally reducing the engagement surface area, thus preventing accidental disengagement.
2Ease of operation
If the contact surface sizes between the hammer and trigger sear are reduced to improve smoothness, then the smoothness improves, but the trigger pull weight may increase due to larger required contact areas
Solution Approach 1:
The patent substitutes the traditional sliding mechanical interface with a rolling element mechanism. Instead of flat surfaces sliding against each other (which creates high friction and requires large contact areas for smooth operation), a spherical rolling element is introduced that rolls between the hammer and trigger sear. This rolling contact dramatically reduces friction, enabling smooth trigger operation with smaller contact surface areas, thereby reducing trigger pull weight while maintaining smoothness.
3Reliability
If traditional flat contact surfaces are used between the hammer and trigger sear, then accidental discharge protection is improved, but the trigger pull weight increases and smoothness deteriorates
Solution Approach 1:
The patent replaces flat contact surfaces with a spherical rolling element that interfaces with both the hammer and trigger sear. This curved surface geometry provides adequate engagement area to prevent accidental disengagement while enabling rolling motion that reduces friction. The spherical shape maintains reliable mechanical engagement through its geometry, ensuring that sufficient contact area is preserved even though the traditional flat-to-flat interface is eliminated.
4Reliability
If traditional flat contact surfaces are used between the hammer and trigger sear, then accidental discharge protection is improved, but the smoothness of trigger pull deteriorates
Solution Approach 1:
The patent replaces the sliding mechanical interface with a rolling element mechanism. The spherical rolling element rolls between the hammer and trigger sear instead of sliding, which dramatically reduces friction and improves smoothness. The rolling contact allows for minimal resistance during trigger activation while the spherical geometry maintains adequate engagement surface area to prevent accidental disengagement, thus achieving both smoothness and reliability simultaneously.
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
This design achieves a low trigger pull weight with smooth operation while enhancing safety by minimizing the risk of accidental discharge, even when the firearm is dropped.
Implementation Method 1
the trigger slide includes a body, and a first rolling element mounted on the body; and the first rolling element is configured to engage and retain the hammer in the second position of the hammer when the trigger slide is in the first position of the trigger slide
Data Source
AI summary
Linear trigger mechanisms for firearms include a trigger slide mounted on, and configured to move linearly in relation to a chassis; and a hammer. The trigger slide has a rolling element, such as a pin-mounted roller or a rolling pin, that engages a contact surface on the hammer and thereby restrains the hammer against its spring bias. When the user pulls the trigger to discharge the firearm, the trigger slide moves linearly, causing the rolling element to roll off of the contact surface and thereby release the hammer. The trigger mechanisms can be equipped with a drop safety that rotates in response to an impact between the firearm and the ground, so as to interfere with the movement of the trigger slide and prevent the release of the hammer.