Replaceable Barrel Receiver Assembly with Backup Pin Attachment
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Solution Overview
Problem
Existing firearm designs with replaceable barrels face safety risks due to improper or missing barrel attachments, which can lead to accidental disassembly during use, particularly in modular firearms where users replace barrels without tools.
Innovation Solution
A clamping connection with a longitudinal slot and transversal screws in the receiver, combined with a transversal pin and threaded hole through the pin and firearm frame, ensures secure attachment even if transversal screws are absent, preventing inadvertent barrel release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clamping connection with transversal screws is used to attach the barrel to the receiver, then the barrel attachment is firm and stable, but the shooter's safety is compromised if the screws are improperly tightened or completely missing
Solution Approach 1:
The attachment system is segmented into multiple independent components: the clamping connection with transversal screws and the separate transversal pin with threaded hole. This segmentation ensures that if one component (screws) fails or is missing, the other component (transversal pin) remains to maintain barrel attachment reliability.
Solution Approach 2:
The design incorporates a backup safety mechanism (transversal pin with threaded hole) that is prepared in advance to compensate for potential screw failure. This prior cushioning ensures that even if screws are improperly tightened or completely missing, the barrel remains securely attached through the transversal pin connection.
2Ease of operation
If the longitudinal slot is made longer to facilitate barrel replacement, then ease of operation is improved, but the risk of barrel misalignment or rotation increases
Solution Approach 1:
The transversal pin acts as an intermediary element that passes through the longitudinal slot and engages with the corresponding hole in the barrel. This intermediary component guides and constrains the barrel during insertion, ensuring proper alignment and preventing rotation even when the slot is long enough to facilitate easy barrel replacement.
3Device complexity
If a simple clamping connection is used for barrel attachment, then device complexity is reduced, but the ability to prevent inadvertent barrel release is compromised
Solution Approach 1:
The attachment mechanism is divided into two independent systems: a simple clamping connection with transversal screws and a separate transversal pin with threaded hole. This segmentation maintains overall system simplicity while adding a redundant safety feature that prevents inadvertent barrel release without significantly increasing device complexity.
Solution Approach 2:
The transversal pin with threaded hole serves multiple functions: it acts as a backup attachment mechanism, a alignment guide, and a safety latch. This multi-functionality enhances barrel fixation reliability without requiring a completely complex new mechanism, as the same component performs multiple protective roles.
Data Source
AI summary
An assembly of a receiver (1) with a barrel (4) wherein the barrel (4) is inserted into a barrel hole (7) in the receiver (1) and is attached in a replaceable manner by means of a clamping connection that comprises a longitudinal slot (2) that longitudinally divides the receiver (1) wall in the insertion location of the barrel (4). In the location of the longitudinal slot (2) at least two transversal screws (3) pass through the receiver (1). In the location of the longitudinal slot (2), a transversal hole (5) extends into the receiver (1) and a transversal pin (10) passes through the transversal hole (5) in such a way that the transversal pin (10) reaches into a corresponding transversal recess (9) in the barrel (4). Perpendicularly to the longitudinal axis of the transversal pin (10) a threaded hole (11) with a connecting screw (12) passes through the transversal pin (10). The connecting screw (12) further passes through a straight-through hole (6) in the receiver (1) and through a stock/frame (13) of the firearm to connect the receiver (1) to the stock/frame (13) of the firearm.