Firearm Trigger Mechanism with Dual Engagement Zones
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Solution Overview
Problem
Firearm trigger mechanisms with low pull-back force increase the risk of accidental discharge due to ease of activation, posing a safety concern, especially during mishandling or drops.
Innovation Solution
A trigger mechanism design featuring a hammer element with ready, intermediate, and fired positions, including a hammer sear and notch, and a trigger element with engagement zones that prevent accidental discharge by ensuring the hammer is retained in the ready position unless intentionally released, utilizing a disconnector to manage the hammer's movement and reduce accidental firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trigger pull force is reduced to improve precision, then the ease of operation increases, but the reliability decreases due to higher risk of accidental discharge
Solution Approach 1:
The hammer element is divided into functionally distinct zones: a hammer sear engagement zone for normal firing operation and a notch engagement zone for safety engagement. This segmentation allows the trigger mechanism to provide both light pull force for precision and enhanced safety engagement for accidental discharge prevention
Solution Approach 2:
The trigger sear acts as an intermediary element that selectively engages with different portions of the hammer element based on trigger position. During normal operation, it engages the hammer sear for controlled firing; during accidental discharge scenarios, it engages the notch to prevent unauthorized firing
2Measurement precision
If the trigger mechanism is designed for light pull force, then the precision for competitive shooters is improved, but the device complexity increases to prevent accidental discharge
Solution Approach 1:
The safety function is merged into the existing trigger mechanism by incorporating the notch and engagement zone features directly into the hammer element and trigger sear interaction. This integration avoids adding separate safety mechanisms while maintaining light pull force for precision shooting
Solution Approach 2:
Different engagement characteristics are provided at different locations on the hammer element. The hammer sear engagement zone provides smooth engagement for precision firing, while the notch engagement zone provides positive engagement for safety. This local differentiation achieves both precision and safety without overall complexity increase
Data Source
AI summary
A trigger mechanism includes a hammer element that has a ready position, an intermediate position, and a fired position. The hammer element includes a hammer sear and a notch positioned at a front of the hammer element. The trigger mechanism includes a trigger element has a ready position that retains the hammer element in the ready position. The trigger mechanism also includes a fired position that releases the hammer element. The trigger element includes a trigger sear that includes a hammer sear engagement zone and a notch engagement zone. When the hammer element is in the ready position, the trigger sear at least partially engages the hammer sear at the hammer sear engagement zone. When the hammer element is in the intermediate position, the trigger sear at least partially engages the notch at the notch engagement zone and not at the hammer sear engagement zone.