Rifle Barrel Tapered Interfaces for Thermal Alignment Stability
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Solution Overview
Problem
Modern firearms, particularly AR-10 or AR-15 style rifles, suffer from misalignment and accuracy issues due to thermal expansion of components, which are not adequately addressed by conventional barrel mounting systems using flat torque shoulders or shrink/thermal fitting processes.
Innovation Solution
The implementation of tapered interfaces in the rifle's barrel and receiver connections, utilizing a double barrel nut assembly with beveled or tapered shoulders, ensures stable alignment and centering of the barrel relative to the receiver bore, even during thermal expansion, through a wedging effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat torque shoulders are used to mount the barrel to the receiver, then the assembly process is simple, but the barrel bore does not sit center with the upper receiver bore and alignment is poor
Solution Approach 1:
The patent replaces flat torque shoulders with curved/tapered interfaces. The barrel extension features a tapered outer surface that mates with a corresponding tapered inner surface in the receiver, creating a curved contact interface instead of a flat one. This curvature allows for self-centering and progressive engagement, ensuring the barrel bore sits center with the receiver bore while maintaining assembly simplicity.
2Manufacturing precision
If shrink-fit or thermal fitting processes are used to rigidly secure the barrel extension, then the rifle is more accurate out of the box, but thermal expansion during firing negates the fit and requires frequent re-zeroing
Solution Approach 1:
The patent changes the geometric parameters of the interface from flat to tapered/curved surfaces. This parameter change allows the interface to dynamically adapt to thermal expansion during firing. The tapered surfaces maintain consistent contact and alignment across temperature variations, eliminating the need for frequent re-zeroing while preserving initial accuracy.
Solution Approach 2:
The patent transitions from a static rigid fit (shrink-fit) to a dynamic interface that adapts during operation. The tapered surfaces allow for micro-adjustments and maintain optimal contact under varying thermal conditions, making the system dynamically responsive rather than statically fixed.
3Device complexity
If a single barrel nut is used to torque the barrel to the receiver, then the device complexity is low, but proper alignment between the barrel bore and receiver bore is not ensured
Solution Approach 1:
The patent uses curved/tapered interfaces instead of flat surfaces, allowing a single barrel nut to achieve both alignment and securement. The tapered surfaces guide the barrel extension into proper alignment as the nut is tightened, eliminating the need for additional alignment features or multiple fasteners.
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
This design maintains accuracy and reduces harmonic vibration, preventing bolt wear and catastrophic failures by ensuring proper alignment and reducing thermal expansion-induced misalignment, thus enhancing rifle reliability and performance.
Implementation Method 1
The tapered interfaces may be stably tapered such that a wedging effect is generated
Implementation Method 2
the barrel, barrel extension, upper receiver, and barrel nut are all typically machined from different metals, each with their own thermal expansion rate. When the weapon is fired and its component materials heat up at different rates, the barrel deviations from center and alignment can be exacerbated
Data Source
AI summary
A rifle with tapered interfaces has a receiver, a barrel extension connected to the receiver at a first interface, a barrel connected to the barrel extension at a second interface, a barrel nut element connected to the barrel extension at a third interface and to the barrel at a fourth interface, and at least two of the first, second, third, and fourth interfaces being tapered interfaces. The tapered interfaces may be stably tapered such that a wedging effect is generated. The barrel extension may have two tapered interfaces. The barrel extension may have a forward external tapered interface connecting to the barrel nut element and a forward internal tapered interface connecting to the barrel.