Switch Barrel Rifle Adjustable Headspace Mechanism
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Solution Overview
Problem
Existing switch-barrel firearms have complex and cumbersome mechanisms for interchanging barrels, lacking the ability to adjust the tension of the barrel within the receiver and the headspace between the barrel and bolt, limiting their usability and accuracy across different shooting scenarios.
Innovation Solution
An interchangeable barrel system with a threaded adjustment mechanism, featuring tangential notches on the barrel and threaded adjustment bolts in the receiver, allowing for fine adjustment of barrel tension and headspace, enabling easy interchange of barrels and accommodating various calibers and lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch-barrel mechanism is implemented to allow barrel interchange, then barrel interchangeability is improved, but the mechanism becomes complicated and cumbersome
Solution Approach 1:
The barrel assembly is segmented into interchangeable components: the barrel itself, the threaded adjustment bolt, and the receiver interface. This allows the barrel to be separated and replaced independently from the receiver, enabling barrel interchangeability without requiring complex overall mechanism changes. The threaded portion on the barrel and corresponding threaded aperture in the receiver create modular, separable connections.
Solution Approach 2:
The receiver is designed with a universal threaded aperture and adjustment mechanism that can accommodate multiple barrel types, calibers, and lengths. The standardized threaded interface and adjustable headspace mechanism allow the same receiver to work with various barrels, providing multi-functionality and reducing the need for different receiver designs for different barrel configurations.
2Ease of operation
If a simple threaded interface is used for barrel interchange, then ease of operation is improved, but the ability to adjust barrel tension and headspace is lost
Solution Approach 1:
The invention merges two functions into a single threaded interface system: the barrel retention function (holding the barrel in place) and the headspace adjustment function (controlling the distance between barrel and bolt). The threaded adjustment bolt simultaneously secures the barrel to the receiver and allows precise control of headspace through its threaded engagement, eliminating the need for separate mechanisms.
Solution Approach 2:
The headspace is made dynamically adjustable through the threaded adjustment bolt mechanism. Unlike fixed headspace designs, this system allows the headspace to be changed by rotating the adjustment bolt, which moves the barrel forward or backward relative to the receiver. This dynamic adjustment capability is integrated into the basic threaded interface, maintaining ease of operation while adding precision control.
3Manufacturing precision
If threaded adjustment bolts are added to control barrel tension and headspace, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The threaded adjustment bolt is designed to be self-contained and self-explanatory. The threaded interface inherently provides both the adjustment capability and the locking function. The user simply needs to rotate the bolt to achieve the desired headspace and tension, with the threads themselves providing the fine adjustment mechanism. No additional complex adjustment mechanisms, tools, or procedures are required—the system serves itself through its inherent threaded geometry.
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 the easy interchange of firearm barrels, allowing for precise adjustment of tension and headspace, enhancing usability and accuracy across different shooting scenarios without the need to discard the entire firearm.
Implementation Method 1
The threaded adjustment bolt can be coaligned with the notch until the distal end of the threaded adjustment bolt contacts the end of the notch. When the adjustment bolt is tightened it contacts the stop to apply a tangential force to the barrel
Implementation Method 2
The action end of the barrel has a threaded portion on the outside surface thereof. The receiver includes a barrel port that has an internal threaded surface adapted to receive the threaded portion of the action end of any of the barrels
Data Source
AI summary
An interchangeable barrel system for a firearm includes one or more barrels each having an outer surface, and an inner surface defining a longitudinal bore open between a muzzle end and an action end. The action end has a threaded portion that includes one or more tangential notches formed partially therethrough. A receiver includes one or two threaded adjustment bolt apertures that tangentially intersect a barrel port. In use, with the action end of one of the barrels threadedly engaged with the barrel port and manually tightened to align one of the threaded adjustment bolt apertures with one of the notches, an adjustment bolt is tightened to contact an end of the notch to apply a tangential force to the barrel to further tighten the barrel within the receiver and to provide a desired headspace between the action end of the barrel and a bolt of the firearm.