Movable Sear Trigger Mechanism for Interference-Free Locking
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Solution Overview
Problem
Existing dual mode triggers for semiautomatic firearms experience misfires and intermittent failures due to dimensional interference between the hammer and trigger, preventing the trigger from being safely locked in a non-firing position and cocked state.
Innovation Solution
A movable sear mechanism is introduced, biased to shift from a seated to an unseated position when interference occurs, allowing the hammer to rotate past the sear and enabling the trigger to be locked in a non-firing position, even when the hammer is cocked, using a spring bias and geometric modifications to prevent misfires and ensure safe mode engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed sear is used in the trigger mechanism, then the structure is simple, but dimensional interference between the hammer and trigger prevents reliable locking in non-firing position and causes misfires
Solution Approach 1:
The patent converts the fixed sear into a movable sear that can shift between seated and unseated positions. This dynamic element allows the sear to automatically adjust its position relative to the hammer, eliminating dimensional interference while maintaining reliable engagement. The movability enables the sear to clear interference zones during hammer cycling while ensuring positive locking when engaged.
2Ease of operation
If the trigger is locked in non-firing position, then safe mode is achieved, but the hammer cannot be cocked due to dimensional interference
Solution Approach 1:
The movable sear enables independent hammer cocking while the trigger remains locked in non-firing position. When the hammer is cocked, the movable sear shifts to an unseated position to clear the interference zone, allowing the hammer to rotate past the trigger assembly. This dynamic adjustment maintains safe mode (trigger locked) while enabling necessary hammer operation.
3Volume of moving object
If dimensional interference between hammer and trigger is present, then the structure is compact, but misfires and intermittent failures occur
Solution Approach 1:
The patent segments the trigger assembly into separate functional components: a fixed trigger body and a movable sear that can independently shift position. This segmentation allows the sear to clear interference zones during operation while maintaining the compact overall structure. The separated functions enable reliable engagement without requiring increased spacing between components.
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 solution eliminates misfires and allows the firearm to be safely cocked and placed in safe mode regardless of the charge state, improving the reliability of high-fire-rate triggers and automatic trigger locks.
Implementation Method 1
The movable sear may be biased into a seated position, for instance with a spring
Implementation Method 2
The movable sear shifts from the seated position to an unseated position when interference occurs between the hammer and the trigger
Data Source
AI summary
Provided in various example embodiments is a firing mechanism for firearms including a trigger with a movable sear attached to the trigger. When dimensional interference occurs within the trigger group, the movable sear is displaced from a seated position to an unseated position, instead of moving the trigger out of the non-firing position. This allows a firearm to be cocked when the trigger is locked in safe mode, and allows a firearm to be placed into safe mode at any time, regardless of the position of the hammer. This functionality improves the effectiveness of automatic trigger locking mechanisms discussed in related applications, and may be applied in various forms to firearms generally.