Firearm Trigger Assembly with Ambidextrous Magazine Release
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Solution Overview
Problem
The Ruger 10-22 semi-automatic firearm's trigger assembly, particularly the BX trigger design, has shortcomings that can be improved upon, including the trigger/sear/disconnector mechanism, bolt hold-open mechanism, and magazine release user interface.
Innovation Solution
A trigger assembly with an improved trigger/sear/disconnector mechanism, an enhanced bolt hold-open mechanism, and an ambidextrous magazine release user interface, featuring a housing with specific internal components like a pivotally mounted trigger member and disconnector, a bolt hold-open lever, and a reversible magazine release mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the traditional trigger assembly design is used, then the structure is simple and easy to manufacture, but the functionality and user experience are limited
Solution Approach 1:
The trigger assembly integrates multiple functions including trigger operation, bolt hold-open, and magazine release into a single unified mechanism. The trigger guard serves dual purposes as both a structural component and a magazine release interface, while the disconnector system coordinates multiple firing modes. This multi-functional integration improves adaptability without proportionally increasing complexity.
Solution Approach 2:
The patent combines the magazine release mechanism with the trigger guard structure, merging two previously separate functions into one integrated component. The bolt hold-open lever is also integrated with the trigger assembly housing, reducing the number of separate parts while maintaining independent functionality of each feature.
2Ease of operation
If the BX trigger design is used, then the trigger pull weight is reduced, but the reliability of the trigger/sear/disconnector mechanism is compromised
Solution Approach 1:
The patent applies different quality characteristics to different parts of the trigger mechanism. The sear engagement surfaces are designed with specific geometry and material properties to ensure reliable locking, while the trigger pull interface is optimized for light operational force. The disconnector lever has differentiated zones for hammer engagement and trigger blade interaction, allowing light pull weight without compromising sear reliability.
Solution Approach 2:
The trigger mechanism uses dynamic elements including spring-loaded components and movable disconnectors that adapt to operational conditions. The trigger blade pivots on a resilient mounting that allows controlled movement, and the disconnector lever dynamically transitions between engaged and disengaged states based on firing mode, maintaining reliability across different operating conditions.
3Ease of manufacture
If the bolt hold-open mechanism is simplified, then the manufacturing cost is reduced, but the bolt hold-open functionality is insufficient
Solution Approach 1:
The bolt hold-open lever is designed to be automatically actuated by the bolt's own movement during operation. When the bolt cycles forward, it automatically engages the hold-open lever, which then maintains the bolt in the open position without requiring additional actuators or complex mechanisms. The system uses the bolt's inherent motion to serve the hold-open function.
Solution Approach 2:
The hold-open lever acts as an intermediary component between the bolt and the user. It translates the bolt's linear motion into a leveraged mechanical advantage that securely holds the bolt open, providing a simple mechanical mediation that achieves reliable functionality with minimal complexity.
4Adaptability or versatility
If the magazine release mechanism is made ambidextrous, then the user interface versatility is improved, but the mechanism complexity increases
Solution Approach 1:
The magazine release features asymmetric geometry on the trigger guard that accommodates both left-handed and right-handed users. The release interface is positioned and shaped to be accessible from either side of the firearm, using asymmetric contours that naturally guide finger placement regardless of user handedness, achieving ambidextrous operation without requiring dual separate mechanisms.
Data Source
AI summary
Provided is a trigger mechanism having a trigger member is pivotally supported by a housing and having a forwardly extending finger portion and an actuation blade portion and a sear fixed in position relative to each other. A hammer pivotally supported inside the housing has a tooth and a disconnector has hook portion. A safety selector movable between safe and fire positions has a first surface that confronts the finger portion to block pivotal movement of the trigger member when in the safe position and a recess that receives the finger portion and allows movement of the trigger member when in the fire position. When the trigger member is pulled, cycling of the firearm action pivots the hammer to engage the tooth with the hook portion and hold the hammer until the trigger member is released to allow the sear to engage the hammer as the hook releases the tooth.