Modular AR Safety Selector Lever Assembly With Tool-Less Keyed Pins
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Solution Overview
Problem
Existing safety selectors for firearms often require tools for installation and maintenance, are prone to damage during operation, and lack durable, high-visibility markings indicating the current mode or state.
Innovation Solution
A tool-less, ambidextrous safety selector lever assembly with a low-tolerance interface to the firearm, featuring a selector core and levers that are removably coupled using keyed pins with notches and detents, allowing for tool-less installation and durable, high-visibility markings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional pinned or screw-type attachment means are used, then the safety selector can be securely mounted to the firearm, but tools are required for installation and maintenance
Solution Approach 1:
The safety selector lever assembly incorporates a self-retaining mechanism where the lever's own geometry and the selector core's features work together to secure the assembly without external tools. The lever includes a recess that receives the selector core extension, and a pin aperture that aligns with an extension aperture, allowing the lever itself to maintain the connection through its structural design rather than requiring separate fastening tools
Solution Approach 2:
The attachment mechanism is divided into distinct functional segments: the lever body with its recess and pin aperture, the selector core with its extension and extension aperture, and the pin that connects them. This segmentation allows each component to be independently manufactured and assembled, simplifying the overall installation process while maintaining secure mounting
2Reliability
If pinned levers are used, then the safety selector can be securely attached, but they are susceptible to damage from errant hammer strikes or punch slippage
Solution Approach 1:
The design incorporates a pin retention feature where the pin is secured within the lever's pin aperture and the selector core's extension aperture in a way that prevents accidental disengagement or damage during operation. The structural integration of the pin within the lever assembly protects it from external impacts such as errant hammer strikes or punch slippage that could damage traditionally pinned levers
Solution Approach 2:
The attachment mechanism merges the lever, selector core extension, and pin into a unified structural assembly. The lever's recess receives the extension, and the pin connects both components, creating an integrated structure that resists damage better than separate pinned components. This merging eliminates weak points where damage could occur
3Manufacturing precision
If keyed interface between lever arms and center barrel/cam is used, then low-tolerance interface with no play is achieved, but tool-less attachment is compromised
Solution Approach 1:
The keyed interface is designed so that the lever's recess and the selector core's extension automatically align and engage with precise tolerances without requiring external tools. The pin aperture and extension aperture are positioned to self-align during assembly, allowing the lever to be attached tool-less while maintaining the low-tolerance, no-play interface characteristic of keyed connections
Data Source
AI summary
A safety selector lever assembly may include a selector core comprising an elongated section having a curved and at least one angled face, a first and second extension positioned on opposing ends of the selector core, each comprising an extension aperture, and wherein the elongated section is positioned between the first and the second extensions, a plurality of levers, each comprising: a proximal and distal end, a recess for receiving one of the first and the second extension, a pin aperture, a pin, wherein at least a portion of the pin can pass through the first pin aperture and the extension aperture, and wherein rotation of the levers to a first position enables firing of the firearm and rotation to a second position precludes firing of the firearm.