Firearm Barrel Clamping Connection with Transversal Pin
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Solution Overview
Problem
Existing modular firearms with barrel replacement mechanisms are prone to safety risks due to improper or missing fasteners, which can lead to accidental barrel detachment during user assembly.
Innovation Solution
A clamping connection system with a longitudinal slot and transversal screws, combined with a transversal pin and threaded hole, ensures secure attachment by requiring the pin to be inserted into a recess for proper assembly, preventing barrel detachment even if transversal screws are absent.
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 fastening system is divided into two independent functional segments: transversal screws for clamping the barrel to the receiver, and a separate longitudinal pin with head for securing the forestock. This segmentation ensures that failure of one segment (missing/improperly tightened screws) does not compromise the entire attachment system, as the pin segment independently prevents barrel detachment.
Solution Approach 2:
The longitudinal pin with head acts as a pre-prepared safety backup that cushions against the harmful effect of missing or improperly tightened transversal screws. The pin's head geometry prevents the forestock from being screwed onto an improperly assembled firearm, providing beforehand protection against accidental barrel detachment.
2Ease of operation
If the longitudinal slot is made slightly bigger than the barrel insertion length to facilitate assembly, then ease of operation is improved, but the barrel position stability deteriorates
Solution Approach 1:
The longitudinal pin acts as an intermediary element that bridges the gap between the forestock and the barrel-receiver assembly. By inserting the pin through the longitudinal slot and into the receiver, it provides additional lateral support that stabilizes the barrel position while still allowing the slot to be sufficiently large for easy assembly operations.
3Reliability
If a threaded hole with connecting screw passes through the transversal pin to connect the receiver to the stock, then the risk of inadvertent barrel release is eliminated, but the device complexity increases
Solution Approach 1:
The fastening system merges multiple functions into integrated components: the longitudinal pin simultaneously serves as a positional reference during assembly, a mechanical stop preventing over-insertion, and a security element whose threaded hole with connecting screw provides redundant attachment. This merging achieves high reliability while minimizing the number of separate parts.
Data Source
Figure 1~3
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Figure 7~8
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.