Anti-rotation Clamp Assembly for Tactical Firearm Barrel Nut
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Solution Overview
Problem
Tactical rifles, such as the M4 Carbine, experience loosening of barrel and hand-guard retainer nuts due to shock and vibration during harsh treatment or sustained rapid fire, leading to potential malfunction and safety issues.
Innovation Solution
A clamp assembly with a C-shaped clamp plate and key pin system that secures the barrel nut to the receiver and hand-guard retainer nut to the hand-guard support, preventing rotation and loosening, while allowing easy disassembly with simple tools like an Allen wrench.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional threaded retainer nuts are used for securing the barrel and hand-guard, then the assembly allows for easy disassembly and assembly, but the retainer nuts become loosened due to shock and vibration during harsh treatment or sustained rapid fire
Solution Approach 1:
The invention divides the retention system into separate functional elements: a clamp plate that provides mechanical clamping force, key pins that prevent rotation, and locator pins that maintain positional alignment. This segmentation allows each element to address a specific aspect of the retention problem while maintaining overall ease of assembly through modular installation.
Solution Approach 2:
The clamp plate serves as an intermediary element between the retainer nuts and the barrel/hand-guard assembly. It transfers and distributes the clamping forces from the retainer nuts, providing a stable interface that resists shock and vibration while maintaining the threaded connections for easy assembly and disassembly.
2Reliability
If the retainer nuts are secured against rotation, then loosening is prevented, but the complexity of the assembly increases
Solution Approach 1:
The clamp plate is designed with an asymmetric configuration featuring a central slot that receives the key pin and specific opening patterns for locator pins. This asymmetric design provides effective anti-rotation capability while maintaining a relatively simple overall structure that can be manufactured and assembled without excessive complexity.
Solution Approach 2:
The clamp plate performs multiple functions simultaneously: it provides clamping force distribution, houses the key pin for anti-rotation, accommodates locator pins for alignment, and serves as a mounting surface for the retainer nuts. This multi-functionality reduces the need for separate components, thereby limiting the increase in assembly complexity.
3Reliability
If key pins and locator pins are added to prevent rotation, then the thread connection is maintained under vibration, but the number of parts increases
Solution Approach 1:
The invention merges the anti-rotation and positional alignment functions into a single integrated clamp plate assembly. The key pin and locator pins are combined with the clamp plate structure, allowing them to be installed and secured together as one unit. This merging reduces the number of separate components and simplifies the assembly process while maintaining reliable thread connection stability.
Data Source
AI summary
A hand-guard and barrel nut clamping assembly for tactical firearms and other mechanical equipment that is subject to frequent or sustained vibration or shock, such as when a firearm is subjected to sustained rapid fire and/or the firearm is handled roughly. A small generally half-moon shaped anti-rotation clamping member is secured to a hand-guard support element or other suitable structure by socket head cap screws and is secured in frictional contact with components of the hand-guard mount and a barrel nut. The anti-rotation clamping member functions as a key to “tie” the barrel nut and hand-guard nut together, simultaneously preventing either one from rotating, and thus preventing inadvertent vibration or shock induced loosening of either the hand-guard retainer nut or the barrel nut. The anti-rotation clamping member is also keyed onto the front of the upper receiver by a slot into which a portion of the receiver is engaged. Alignment pins in the hand-guard support element also key a barrel nut against inadvertent rotation and further ensure against loosening of the barrel nut by vibration and shock.