Double-Shot Firearm Trigger with Sear-Catch Control
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Solution Overview
Problem
Existing firearms lack a mechanism to seamlessly switch between semi-automatic and two-shot firing modes without compromising safety and operational reliability.
Innovation Solution
A trigger assembly with a safety selector that allows switching between safe, semi-automatic, and two-shot modes, utilizing a sear catch to control the discharge of rounds based on trigger position changes, and a secondary safety mechanism to prevent unintended firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a trigger assembly is designed to allow multiple firing modes (semi-automatic and two-shot), then the adaptability and versatility of the firearm is improved, but the device complexity increases due to additional mechanisms like safety selector and sear catch
Solution Approach 1:
The trigger assembly is designed to perform multiple functions through a single integrated mechanism. The safety selector switch enables the same trigger assembly to operate in three different modes: safe mode (preventing trigger movement), semi-automatic mode (one shot per trigger pull), and two-shot mode (two consecutive shots per trigger pull). This multi-functionality approach allows the firearm to adapt to different operational requirements without requiring separate trigger assemblies for each mode, thereby improving versatility while managing complexity through design integration
2Reliability
If a safety mechanism is added to prevent accidental discharges, then the safety and reliability are improved, but the ease of operation decreases due to additional controls
Solution Approach 1:
The safety selector switch is positioned and configured to be engaged before the trigger is pulled. By requiring the user to pre-select the desired firing mode (safe, semi-automatic, or two-shot) using the safety selector, the system performs the safety function in advance. This preliminary action ensures that the trigger assembly is properly configured for the intended operation before the shooting action begins, preventing accidental discharges while maintaining intuitive operation through clear mode selection
3Ease of operation
If the trigger element is allowed to move freely to the pulled position, then the ease of operation is improved, but the reliability decreases due to risk of unintended firing
Solution Approach 1:
The trigger assembly employs a dynamic safety mechanism where the safety selector switch can be positioned in different states (safe, semi-automatic, two-shot) to dynamically control trigger functionality. In safe mode, the safety selector physically prevents the trigger element from moving to the pulled position. In semi-automatic and two-shot modes, the trigger is permitted to move freely. This dynamic approach allows the system to adapt its safety characteristics based on the selected mode, ensuring controlled discharge when needed while maintaining ease of operation when safety is not the primary concern
Data Source
AI summary
A firearm with a receiver body, a barrel, and a trigger assembly. The trigger assembly includes a trigger element movable between a pulled position and a released position. The trigger assembly is switchable between a safe mode that prevents the trigger element from moving to the pulled position, a semi-automatic mode that discharges a single round from the barrel responsive to each time the trigger element is moved to the pulled position, and a 2-shot mode that discharges an inintial round from the barrel when the trigger element is moved to the pulled position and then a subsequent round when the trigger element is moved to the released position.