Firearm Takedown Pin With Segmented Slots For Partial Rotation
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Solution Overview
Problem
Existing takedown pins for firearms only allow for two positions: engaged/locked and disengaged/unlocked, lacking an intermediate, partially engaged or inoperably locked position, and have elongate slots that are closed on both ends.
Innovation Solution
A takedown pin design that includes a head and shank with a first and second groove or slot, allowing for slidable engagement between engaged/locked, partially engaged/inoperably locked, and disengaged/unlocked positions, with the second groove or slot optionally being open or partially open to facilitate installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional takedown pin with closed elongate slots is used, then the pin can be securely locked in engaged and disengaged positions, but it cannot provide an intermediate partially engaged position and requires complete disassembly for installation/removal
Solution Approach 1:
The pin structure is segmented into multiple functional components: a head portion, a shank portion, and multiple elongate slots (first slot, second slot, third slot) with different configurations. The slots are divided into open-ended and closed-ended sections, creating distinct operational zones that enable multiple positions (engaged, partially engaged, disengaged) within a single pin structure.
Solution Approach 2:
The pin transitions from a static two-position design to a dynamic multi-position system. The open-ended slots allow the pin to be inserted and removed partially, enabling an intermediate partially engaged position where the upper receiver is rotated only partially relative to the lower receiver. This dynamic capability allows flexible adjustment between fully engaged, partially engaged, and fully disengaged states.
2Ease of manufacture
If closed elongate slots are used in the takedown pin, then the pin maintains structural integrity, but installation and removal require complete disassembly of the lower receiver
Solution Approach 1:
Different portions of the pin have different slot configurations tailored to specific functions. The first elongate slot has closed ends for maintaining structural integrity during normal operation. The second and third elongate slots have open ends that facilitate easy insertion and removal. This local differentiation allows the pin to simultaneously achieve structural strength and operational ease without compromising either property.
3Device complexity
If only two positions (engaged and disengaged) are provided, then the pin structure remains simple, but the firearm lacks an intermediate inoperably locked position for enhanced safety or partial assembly needs
Solution Approach 1:
The pin design adds a dimensional aspect to position control by utilizing the longitudinal extent of multiple slots along the pin's length. The first slot operates in one dimensional zone (proximal to head), while the second and third slots operate in another zone (distal to head). This dimensional layering enables three distinct positions (engaged, partially engaged, disengaged) without significantly increasing overall structural complexity.
Data Source
AI summary
A takedown pin for a firearm, having at least some of a head; a shank, wherein the shank extends from the head to a terminal surface; a projection extending from at least a portion of the terminal surface; a first groove or slot formed in at least a portion of the shank; a second groove or slot formed in at least a portion of the shank, wherein the first end of the first groove or slot is positioned at a spaced apart location from the first end of the second groove or slot; and a connecting groove or slot formed between the first end of the first groove or slot and the first end of the second groove or slot.