Firearm Receiver Adjustable Positioning Assembly
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Solution Overview
Problem
The existing assembly of upper and lower receiver portions in firearms often results in undesirable movement due to manufacturing tolerances, leading to misalignment of bolt and cartridge, reduced reliability, and diminished accuracy.
Innovation Solution
An adjustable positioning assembly for the firearm receiver, featuring a takedown pin assembly with a lock tensioner, securement bolt, and cam pin, which imparts a downward force on the upper receiver to align it properly with the lower receiver, reducing movement between the receiver halves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional takedown pin assembly is used to secure upper and lower receivers, then the firearm can be assembled and disassembled, but manufacturing tolerances cause gap formation and undesirable movement between receiver halves
Solution Approach 1:
The cam pin is rotated in advance to impart a downward force on the upper receiver before final engagement, pre-positioning the upper receiver to eliminate gaps and alignment issues that would otherwise result from manufacturing tolerances
Solution Approach 2:
The cam mechanism transforms rotational motion into linear downward force, changing the positional parameter of the upper receiver to achieve precise alignment and eliminate gaps with the lower receiver
2Device complexity
If upper and lower receivers are secured with standard pins, then the firearm structure is simple, but independent movement between receivers reduces reliability and accuracy
Solution Approach 1:
The downward force is applied in advance through the cam mechanism to pre-align the bolt channel and cartridge positioning, ensuring reliable alignment before the pin is fully engaged, thereby preventing misalignment issues during operation
Solution Approach 2:
The cam pin acts as an intermediary mechanism between the simple pin structure and the requirement for precise alignment, translating simple rotational input into the complex alignment and downward force needed to eliminate gaps and ensure reliability
3Productivity
If receivers are assembled with standard tolerances, then manufacturing is easier and faster, but recoil forces cause barrel and projectile movement that diminishes accuracy
Solution Approach 1:
The alignment is established in advance during assembly by rotating the cam pin to apply downward force, pre-compensating for tolerance accumulation and ensuring precise alignment that can withstand recoil forces without compromising accuracy
Solution Approach 2:
The cam mechanism changes the vertical position parameter of the upper receiver, adjusting it to achieve precise alignment with the lower receiver that maintains accuracy under recoil conditions while allowing standard manufacturing tolerances
Data Source
AI summary
A firearm receiver includes a lower receiver body having a pair of takedown pin openings that are positioned along each side, and a bolt channel that extends diagonally from the back end of the receiver body to the inside of the receiver body. A takedown pin assembly is positioned within the receiver body and is in communication with the bolt channel. The takedown pin assembly including a takedown pin that is selectively positioned within the pair of takedown pin openings. The takedown pin assembly including a cam-pin and securement bolt that engage a lock tensioner that is connected to the takedown pin. The cam-pin transitioning between an engaged position and a disengaged position. In the engaged position, the cam-pin imparts a downward force onto the lock tensioner, takedown pin and an upper receiver that is connected to the takedown pin.