Locking Takedown Pin With Internal Release for Receiver Reassembly
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Solution Overview
Problem
Current firearm takedown and pivot pin systems for coupling upper and lower receivers are inefficient in secure detachment and reassembly, lacking a reliable mechanism to easily release and reengage the locking pins.
Innovation Solution
A detent mechanism with a locking pin, release pin, and spring system that secures the upper and lower receivers together, allowing for easy detachment by translating the release pin to disengage the detent pin, and re-engagement through a cap and shaft design with external grooves and cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple pin system is used to couple receivers, then the device complexity is reduced, but the ease of operation for secure detachment and reassembly deteriorates
Solution Approach 1:
The release pin is nested inside the locking pin, with the release pin's distal end accessible through a passage in the locking pin. This nested configuration allows the release mechanism to be integrated within the locking structure without adding external complexity, enabling easy operation through a single accessible component
Solution Approach 2:
The detent mechanism acts as an intermediary between the locking pin and the receiver components. It provides an automatic locking function that secures the connection without requiring additional manual intervention, thereby improving ease of operation while maintaining simple pin system architecture
2Reliability
If a reliable locking mechanism is implemented, then the reliability of the connection is improved, but the device complexity increases
Solution Approach 1:
The detent mechanism with spring automatically engages with the locking pin to secure the connection. The spring-loaded detent self-activates upon insertion, providing reliable locking without requiring additional components or complex control systems, thus maintaining simplicity while ensuring connection reliability
Solution Approach 2:
The locking pin is segmented into functional zones: a locking portion that engages with the receiver, a passage for the release mechanism, and a distal end for manual operation. This segmentation allows each component to perform its specific function efficiently, achieving reliable connection through modular simplicity
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
Facilitates secure and efficient detachment and reassembly of firearm receivers, ensuring reliable locking and unlocking mechanisms, enhancing user convenience and operational safety.
Implementation Method 1
The detent mechanism may include a cavity and a spring mounted within the cavity and configured to urge the detent pin outwardly from the cavity
Implementation Method 2
A spring may be positioned within the locking pin and configured to urge the release pin toward the detent opening
Data Source
AI summary
The present invention is directed to system of fasteners for a firearm, which includes a takedown pin and pivot pin for coupling an upper receiver to the lower receiver of a firearm. The system includes a first component defining one or more first openings and a second component defining one or more second openings. A detent mechanism is secured to the second component and includes a detent pin. A locking pin is configured to insert through the first opening and the second opening to secure the first component to the second component. The locking pin defines a detent opening positioned to receive the detent pin when the locking pin is inserted through the second opening. A release pin is positioned within the locking pin and is configured to urge the detent pin outwardly relative to the locking pin when the release pin is translated relative to the locking pin.