Handguard Attachment Using Wedge Compression on Barrel Nut
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Solution Overview
Problem
Existing firearm barrel handguard attachment methods to standard AR-pattern upper receivers often require clamping, which can distort or weaken the handguard material due to the need to flex it for securement.
Innovation Solution
A handguard attachment system using internal wedges that are drawn together independently within the handguard sleeve to secure it to the barrel nut, eliminating the need for clamping and thus minimizing material distortion, featuring a barrel nut with an annular groove and a handguard sleeve with a cross bore and wedge members connected by adjustable fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a handguard is clamped to the barrel nut by flexing the handguard material, then the handguard can be securely attached to the upper receiver, but the handguard material becomes distorted or weakened
Solution Approach 1:
The handguard attachment system is divided into separate components: the handguard sleeve, the barrel nut, and independent wedge members. The wedges are separate elements that can be adjusted independently without requiring the handguard material itself to be flexed or deformed, thus maintaining material strength while achieving secure attachment.
Solution Approach 2:
The wedge members act as intermediary elements between the handguard sleeve and the barrel nut. Instead of directly clamping the handguard material, the wedges are drawn together within the sleeve to compress against the barrel nut, providing the securing force through an intermediate mechanism that does not require flexing the handguard material.
2Reliability
If a handguard is clamped to the barrel nut by flexing the handguard material, then the handguard can be securely attached to the upper receiver, but the handguard material becomes distorted
Solution Approach 1:
The attachment mechanism is segmented into the handguard sleeve and separate wedge members. The wedges can be adjusted independently within the sleeve to achieve proper alignment and secure attachment without requiring the handguard sleeve itself to be deformed or distorted.
Solution Approach 2:
The wedge members are designed to be adjustable and movable within the handguard sleeve. This dynamic adjustment capability allows the wedges to be positioned optimally for secure attachment while maintaining the static, undistorted shape of the handguard sleeve material.
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 solution provides a secure attachment to the upper receiver without flexing or distorting the handguard, ensuring stability and durability while allowing for easy installation and adjustment, thereby enhancing the structural integrity and usability of the handguard.
Implementation Method 1
a pair of wedge members are sized to be received in the channel and connected by at least one wedge fastener configured to adjustably move the wedge members together. The wedge members are pulled together by adjusting the wedge fastener, compressing them between the barrel nut and handguard sleeve.
Data Source
AI summary
A handguard for attachment to a standard AR-pattern firearm upper receiver. A barrel nut has a substantially cylindrical outer surface with an annular groove. A handguard sleeve has an end opening configured to slide over the outer surface of the barrel nut, a channel with a bottom guide surface, and a substantially transverse cross bore positioned to at least partially intersect the end opening to align with the annular groove when the handguard sleeve is positioned on the barrel nut. A pair of wedge members are sized to be received in the channel and connected by at least one wedge fastener configured to adjustably move the wedge members together. When the barrel nut is attached to an upper receiver, the handguard sleeve is attached to the upper receiver by sliding the end opening over the barrel nut and inserting a cross bolt fastener in the cross bore and a portion of the annular groove. The wedge members are pulled together by adjusting the wedge fastener, compressing them between the barrel nut and handguard sleeve.