Trigger Device With Captured Roller Reduces Creep
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Solution Overview
Problem
Existing trigger devices for firearms and crossbows face challenges in achieving a consistent and predictable trigger pull load, which affects accuracy and safety, as they often require significant displacement for disengagement of sear and trigger surfaces, leading to trigger creep and increased activation frequency.
Innovation Solution
A trigger device with a housing, pivotally mounted trigger, sear arm, and ticker mechanism featuring a captured roller and adjustable biasing members, which reduces trigger pull load by utilizing balanced forces for release rather than displacement, and an adjustment mechanism with feedback for precise tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the trigger pull load is relatively large, then safety is improved by preventing inadvertent activation, but accuracy deteriorates due to increased activation force affecting shooter control
Solution Approach 1:
The patent applies parameter changes by making the trigger pull load adjustable through a mechanism that allows the user to modify the spring tension or mechanical leverage. This enables the trigger pull force to be tuned to a specific value that optimizes both safety and accuracy, rather than being fixed at a suboptimal level.
Solution Approach 2:
The patent implements dynamics by providing an adjustable trigger mechanism where the pull load can be modified based on user preference or operational conditions. This dynamic adjustment capability allows the system to adapt between prioritizing safety (higher pull load) or accuracy (lower pull load) depending on the shooting scenario.
2Ease of operation
If the trigger pull load is relatively small, then accuracy is improved by reducing the effect of activation on shooter control, but safety deteriorates due to increased risk of inadvertent activation
Solution Approach 1:
The patent applies parameter changes by making the trigger pull load adjustable through a mechanism that allows the user to modify the spring tension or mechanical leverage. This enables the trigger pull force to be tuned to a specific value that optimizes both safety and accuracy, rather than being fixed at a suboptimal level.
Solution Approach 2:
The patent implements dynamics by providing an adjustable trigger mechanism where the pull load can be modified based on user preference or operational conditions. This dynamic adjustment capability allows the system to adapt between prioritizing safety (higher pull load) or accuracy (lower pull load) depending on the shooting scenario.
3Reliability
If significant displacement is required for disengagement of sear and trigger surfaces, then reliability is improved by ensuring positive engagement, but trigger creep increases reducing accuracy
Solution Approach 1:
The patent applies spheroidality by replacing the traditional flat sliding contact between sear and trigger surfaces with curved or rounded surfaces. This curvature allows the disengagement to occur through a rotational arc rather than linear displacement, reducing trigger creep while maintaining positive engagement through the geometry of the curved surfaces.
Solution Approach 2:
The patent applies mechanical vibration by incorporating a mechanism that uses vibratory motion to assist in the disengagement of the sear and trigger surfaces. The vibration helps overcome static friction and enables cleaner, more consistent release with minimal trigger movement, reducing trigger creep.
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 solution significantly reduces trigger creep, providing a more accurate and safer trigger activation with a crisp release, allowing for easier adjustment of trigger sensitivity and reducing the force required for activation.
Implementation Method 1
a captured roller positioned at least partially within the apertures and extending through the slot, the captured roller configured to selectively engage the first sear surface and the first contact surfaces
Implementation Method 2
a trigger biasing member configured to bias the trigger in a ready position
Implementation Method 3
a lever extending from the trigger to the sear arm, the lever providing a mechanical advantage for reducing a trigger pull load
Data Source
AI summary
A trigger device for activating a firing mechanism, the trigger device comprising a housing, a trigger pivotally mounted on the housing via a trigger pivot pin, a sear arm comprising a first sear surface, a ticker extending generally from the trigger to the sear arm, the ticker pivotable about a ticker pivot pin, the ticker comprising spaced apart flanges, each of which comprises an aperture defining at least a first contact surface, and a captured roller positioned at least partially within the apertures, wherein in a captured position the first sear surface and the first contact surfaces engage the captured roller and in a released position the first contact surfaces disengage from the captured roller to allow the captured roller to move within the aperture.