Removable Pin with Insertion Aperture for AR-15 Assembly
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Solution Overview
Problem
Assembling a pivot pin in AR-15 style rifles is difficult and time-consuming due to the significant force exerted by the pivot pin spring, often resulting in lost components and safety hazards with traditional methods.
Innovation Solution
A removable pivot pin with a transverse insertion aperture and an accompanying insertion tool, allowing for controlled insertion of the pivot pin spring and detent into the lower receiver assembly, reducing the need for precise coordination and minimizing the risk of component loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional methods are used to assemble the pivot pin, then the pivot pin spring can be installed, but the process becomes difficult and time-consuming due to the significant force exerted by the spring
Solution Approach 1:
The pivot pin assembly is segmented into distinct components: the pivot pin itself, the pivot pin spring, and the pivot pin detent. The insertion aperture allows the spring and detent to be inserted separately through the pin, enabling staged assembly rather than requiring all components to be installed simultaneously through a single aperture.
Solution Approach 2:
The pivot pin acts as an intermediary component that facilitates the installation of the spring and detent. By providing a transverse insertion aperture through the pin, the system creates an intermediate access path that allows components to be installed in a controlled sequence, reducing the force requirements compared to traditional methods.
2Reliability
If traditional methods are used to assemble the pivot pin, then the spring can be installed, but components are frequently lost and safety hazards occur
Solution Approach 1:
The insertion aperture merges multiple functions into a single structural feature: it serves as both the access path for inserting the spring and detent, and as a containment structure that guides these components into the lower receiver assembly. This unified approach prevents components from being dropped or lost during the assembly process.
Solution Approach 2:
The pivot pin structure itself provides the guidance and containment necessary for safe assembly. The transverse insertion aperture is designed to naturally guide the spring and detent into the correct position and retain them during installation, eliminating the need for additional tools or techniques to prevent component loss.
3Ease of operation
If a transverse insertion aperture is added to the pivot pin, then assembly is simplified and safety is enhanced, but the device complexity increases
Solution Approach 1:
The transverse insertion aperture is designed to serve multiple functions: it allows insertion of the pivot pin spring, allows insertion of the pivot pin detent, and provides structural guidance for both components. This multi-functionality justifies the added structural element by consolidating multiple assembly operations through a single feature.
Data Source
AI summary
A removable pin for securing two or more structures together, the pin including an insertion aperture for aiding in assembling the pin into at least one of said two or more structures. The insertion aperture is formed to receive and allow the passage of mechanical components that are necessary for proper functioning of the pin or overall mechanical device associated with the pin. A tool sized for insertion into the insertion aperture may be utilized to insert the mechanical components through the insertion aperture. The tool may also be utilized to manipulate the pin such that further assembly is possible.