Deflectable Locking Member for AR10 Trigger Adaptation
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Solution Overview
Problem
The existing forced reset semiautomatic trigger mechanisms designed for AR15-pattern firearms are not operable in AR10-pattern firearms due to dimensional differences, specifically the bolt carrier's unique positioning, which results in the locking member being either too short to be actuated or interfering with the bolt carrier's movement.
Innovation Solution
A deflectable extension of the locking member that pivots when actuated by the rear portion of the bolt carrier and folds to avoid interference with the forward portion as it cycles rearward, allowing smooth operation without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upward length of the locking member is extended to be contacted and actuated by the rear portion of the bolt carrier, then the trigger member can be released when the bolt carrier reaches the in-battery position, but the extended locking member interferes with the forward portion of the bolt carrier as it cycles rearward
Solution Approach 1:
The locking member is divided into two functional segments: a body portion that remains stationary to maintain the trigger lock, and a deflectable extension portion that can move independently to accommodate the bolt carrier's movement without interfering with its rearward cycle
Solution Approach 2:
The extension portion is made deflectable rather than rigid, allowing it to dynamically adjust its position - remaining extended to contact the bolt carrier during forward movement, then deflecting backward to clear the bolt carrier during rearward movement
2Ease of operation
If the locking member is kept short to avoid interfering with the bolt carrier's rearward movement, then smooth cycling is maintained, but the locking member cannot be actuated by the bolt carrier to release the trigger member
Solution Approach 1:
The locking member's functionality is extended in the vertical dimension through the deflectable extension portion, allowing it to reach the bolt carrier for actuation while the main body portion remains in its original position to avoid interference during rearward movement
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
Enables the trigger mechanism to function correctly in AR10-pattern firearms by ensuring the locking member is actuated at the correct position and allows the bolt carrier to pass without causing damage or malfunction, maintaining the locking status of the trigger member.
Implementation Method 1
The locking member (12) includes a deflectable extension portion (22) that is pivotable on a pivot pin (24)
Data Source
AI summary
In a forced rest trigger mechanism, provided is an extended trigger member locking device having a locking member that is movable between a first position in which it locks a trigger member against pulling movement and a second position where it does not restrict movement of the trigger member. The locking member is configured to be movably supported by a frame and includes a generally upward extension portion configured to make actuating contact with a surface of a bolt carrier. The locking member has a body portion that is movably supported and an upward extension portion that is separately movable relative to the body portion between an extended position and a deflected position.