Firearm Takedown Assembly With Retention Plate
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Solution Overview
Problem
The existing process of removing the rear takedown pin from an AR-15 rifle to separate the upper and lower receivers is prone to accidental misplacement, making it difficult to reinsert and reassemble the firearm quickly.
Innovation Solution
A rear mounted takedown assembly comprising a docking plate, a lever pivotably attached to the docking plate, and a pivot pin, which allows the takedown pin to be removed and reinserted without completely detaching it from the firearm, using a polyoxymethylene takedown pin with a groove and flange for reduced friction and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rear takedown pin is completely removed to separate the upper receiver from the lower receiver, then the separation process is simple and quick, but the pin is prone to accidental misplacement and difficult to reinsert
Solution Approach 1:
The docking plate serves as an intermediary component that retains the takedown pin when not in use. The pin remains attached to the docking plate rather than being completely removed, preventing misplacement while still allowing receiver separation. The docking plate acts as a mediator between the pin and the user, holding the pin in a secure but accessible position.
2Ease of operation
If the rear takedown pin is completely removed for cleaning, then access to the action is achieved, but time is lost in removing and reinserting the pin
Solution Approach 1:
The takedown pin is preliminarily retained on the docking plate in a ready position. When cleaning is needed, the pin is already attached to the docking plate structure, so reinsertion is simply a matter of placing it back into its slot rather than searching for a completely removed pin. This preliminary retention arrangement significantly reduces reassembly time.
3Device complexity
If a traditional takedown pin is used, then the structure is simple, but friction causes wear and operational difficulty over time
Solution Approach 1:
The takedown pin's material parameter is changed from traditional metal to polyoxymethylene (a self-lubricating polymer). This material parameter change reduces friction between the pin and its receiving holes, eliminating wear issues and operational difficulty while maintaining the simple pin structure. The material change fundamentally alters the friction characteristic without complicating the design.
Data Source
AI summary
The present invention is directed toward a firearm takedown assembly. The preferred embodiment of the firearm takedown assembly comprises a docking plate configured to be removably secured to a firearm and a lever pivotably attached to the docking plate. The assembly may further comprise a pivot pin, wherein the lever is connected to the pivot pin. The lever is utilized to remove a takedown pin from the upper and lower receiver of the firearm so that a user may quickly disassembly the firearm. When the user desires to reassembly the user may thumb the lever to reinsert the takedown pin into the upper and lower receiver.