Rifle Trigger Mechanism With Three-Position Safety
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Solution Overview
Problem
Current rifles with trigger safety systems require shooters to place the firearm in an unsafe position to remove a loaded cartridge, risking accidental discharge due to mechanical failure or bumping the trigger, and existing solutions either eliminate the bolt stop or lead to catastrophic consequences like open bolts or debris introduction.
Innovation Solution
A trigger mechanism with a safety mechanism that maintains the bolt lock in the 'safe' position while providing a secondary position to unlock the bolt lock, preventing the firing pin from moving forward, ensuring the rifle remains safe during cartridge removal without eliminating the bolt stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the safety lever is moved to the 'fire' position to remove a loaded cartridge, then the bolt lock is released allowing the bolt to open, but the trigger can be accidentally bumped causing the cartridge to ignite
Solution Approach 1:
The safety mechanism is divided into two independent functions: bolt lock control and trigger control. The bolt lock can be released independently to open the bolt and remove cartridges, while the trigger remains mechanically blocked by the sear. This segmentation allows safe cartridge removal without exposing the trigger to accidental activation.
Solution Approach 2:
The sear acts as an intermediary mechanical block that prevents the trigger from moving forward regardless of the safety lever position. This intermediary constraint ensures that even when the bolt lock is released for cartridge removal, the trigger cannot accidentally bump and ignite a cartridge.
2Reliability
If the bolt stop is eliminated to allow safe unloading, then the bolt can be opened with safety lever in 'safe' position, but the rifle bolt may come open during use or debris may be introduced into the chamber
Solution Approach 1:
The mechanism separates bolt lock control from trigger control, allowing the bolt lock to remain engaged during normal operation while enabling safe cartridge removal through a different pathway (moving safety lever to 'fire' position to release bolt lock, then opening bolt manually). This prevents unintended bolt opening during use while maintaining chamber protection.
Solution Approach 2:
The bolt lock transitions from a static locked state during operation to a releasable state when the safety lever is moved to 'fire' position. This dynamic control allows the system to adapt between operational safety (bolt locked) and unloading capability (bolt lock released, then manually opened).
3Reliability
If a three-position safety mechanism is implemented, then the bolt lock can be released while maintaining trigger safety, but the device complexity increases
Solution Approach 1:
The safety lever combines multiple functions into a single control element: it controls both the bolt lock release and maintains trigger safety through the sear mechanism. This merging reduces the need for separate controls while achieving the desired three-position functionality (safe with bolt locked, unsafe with bolt lock released but trigger blocked, and fire position).
Data Source
AI summary
A trigger mechanism for a rifle having a trigger housing, a trigger, a cocking piece, a bolt lock, a pivotable safety key, a pivotable sear, a sear engagement, and a ball détente spring. The sear engagement is fixedly attached to the upper part of the trigger. The safety key has a bolt lock guide that is configured to move the bolt lock among three different positions, each of which corresponds to a position of the ball détente spring on the inside of the safety key. When the bolt lock is in the first position, neither the bolt nor the trigger can move. When the bolt lock is in the second position, the bolt is free to rotate, but the trigger cannot move. When the bolt lock is in the third position, the bolt is free to move, and the trigger can also move.