Spring-Loaded Quick Coupling Barrel Retaining System
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Solution Overview
Problem
Conventional barrel retaining systems in firearms are cumbersome and time-consuming for rapid barrel swapping, especially under combat conditions, due to the need for specialized tools and partial disassembly of the handguard to manage hot barrels and maintain aiming accuracy.
Innovation Solution
A spring-loaded quick coupling barrel retaining system that allows for tool-free barrel exchange by using a barrel nut configured to engage the barrel independently of the receiver, with a dual locking mechanism and optional third locking mechanism for enhanced security, enabling quick and secure barrel changes without affecting the rifle's aim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional barrel nut arrangement is used to secure the barrel to the receiver, then the barrel is securely retained, but the barrel exchange process becomes cumbersome and time-consuming requiring specialized tools and partial disassembly
Solution Approach 1:
The barrel retaining system is divided into separate functional components: a barrel extension with locking lugs on the barrel, and a corresponding barrel nut with locking surfaces on the receiver. This segmentation allows the barrel to be quickly detached by simply unscrewing the barrel nut without affecting other components, enabling rapid barrel exchange while maintaining secure retention when locked.
Solution Approach 2:
The locking function is extracted from a complex multi-component system and simplified to a direct barrel nut-to-receiver interface. The barrel extension with integrated locking lugs is removed as a separate replaceable unit, allowing the barrel nut to be the sole focus of the exchange operation. This eliminates the need for specialized wrenches and partial handguard disassembly.
2Reliability
If a conventional barrel nut system is used, then the barrel can be secured to the receiver, but the system requires specialized tools such as barrel nut wrenches and partial disassembly of the handguard
Solution Approach 1:
The barrel extension is designed with integrated locking lugs that automatically engage with the barrel nut's locking surfaces when the barrel is inserted. The barrel nut itself serves as both the securing mechanism and the interface for removal, eliminating the need for separate specialized tools. The system is self-contained and can be operated with simple hand manipulation.
3Loss of time
If rapid barrel swapping is implemented, then barrel exchange time is reduced, but manufacturing precision requirements increase to ensure proper locking and alignment
Solution Approach 1:
The locking lugs on the barrel extension are designed with slight flexibility or compliance features that allow them to adapt to minor variations in manufacturing tolerances. The locking surfaces are configured to provide self-aligning contact, where the engagement geometry naturally compensates for small dimensional variations, maintaining reliable locking without requiring extremely tight manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates rapid and secure barrel swapping without tools, maintaining the original aiming point and reducing vibration, while simplifying manufacturing and reducing the need for precise manufacturing tolerances, thus enhancing operational efficiency and reliability.
Implementation Method 1
a spring member mounted on the barrel assembly and operably engaging the barrel nut so as to bias the barrel assembly in a forward direction away from the barrel nut
Data Source
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AI summary
A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such a splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.