Firearm Handguard Lock-Up System Using Wedge Assembly
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Solution Overview
Problem
Current locking systems for handguards and upper receivers in firearms are bulky, difficult to assemble, and not easily removable for maintenance, leading to play between components and suboptimal alignment.
Innovation Solution
A lock-up system comprising a handguard, a barrel nut, and a wedge assembly that uses inclined surfaces to create tension and pressure for a secure, near-permanent connection between the handguard and upper receiver, with optional assembly screws and locator pins for additional retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking system is used to connect handguard to upper receiver, then the connection tightness and permanence are improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The locking system is divided into separate modular components: a handguard with an integrated lock-up device, a barrel nut assembly, and a wedge assembly. These segments can be assembled and disassembled independently, reducing overall system complexity while maintaining connection reliability through precise mating surfaces and locking interfaces.
Solution Approach 2:
The wedge assembly is nested within a cavity in the handguard, and the lock-up device is integrated into the handguard structure itself. This nested arrangement consolidates multiple functions into compact configurations, improving connection tightness without proportionally increasing device complexity.
2Reliability
If a locking system is used to connect handguard to upper receiver, then the connection tightness is improved, but the ease of assembly and disassembly deteriorates
Solution Approach 1:
The system uses clearly defined separate components (handguard with lock-up device, barrel nut assembly, wedge assembly) that can be handled and positioned independently during assembly. This segmentation, combined with alignment features, makes the assembly process more manageable and easier to perform correctly the first time.
Solution Approach 2:
The handguard is pre-configured with an integrated lock-up device and the barrel nut assembly includes pre-positioned wedge components. These preliminary configurations ensure proper alignment and engagement during assembly, reducing the skill level and time required for correct assembly while maintaining secure connection.
3Manufacturing precision
If a locking system is used to connect handguard to upper receiver, then the alignment precision is improved, but the ease of repair and maintenance deteriorates
Solution Approach 1:
The modular segmentation allows the wedge assembly and lock-up device to be removed and replaced independently if worn or damaged. This maintains high alignment precision through precision-machined interfaces while improving maintainability by allowing selective replacement of wear components without replacing the entire handguard or upper receiver.
Solution Approach 2:
The design allows worn locking components (wedge assembly, lock-up device elements) to be discarded and replaced with new components while retaining the main handguard and upper receiver. This recovering approach maintains alignment precision through the preserved precision interfaces while significantly improving ease of repair.
4Manufacturing precision
If a one-piece upper receiver/handguard is used, then the alignment and connection are improved, but the adaptability and ease of customization deteriorates
Solution Approach 1:
The system segments the handguard and upper receiver as separate components with precision locking interfaces. This maintains alignment quality comparable to one-piece construction while enabling easy interchange of handguards and customization of the firearm configuration.
Solution Approach 2:
The lock-up device and barrel nut assembly serve as universal interfaces that can accommodate different handguard designs and configurations. This multi-functionality maintains precise alignment while greatly enhancing adaptability and ease of customization for different applications and accessories.
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
The system provides a secure, permanent connection that aligns the handguard and upper receiver, allowing for easy assembly and disassembly, reducing play and facilitating maintenance, while maintaining structural integrity.
Implementation Method 1
The wedge assembly includes a top wedge and a bottom wedge. The upper surface of the top wedge has a generally indented surface... The lower surface of the top wedge is inclined. The bottom wedge has a lower surface configured to be received into and confront the interior portion of the lower lip of the handguard. The upper surface of the bottom wedge is inclined, complementary to the incline of the lower surface of the top wedge.
Data Source
AI summary
A method of locking a handguard relative to an upper receiver of a firearm. The method includes providing a wedge assembly having a top wedge member and a bottom wedge member, each having complementary inclined surfaces; a barrel nut that is configured to receive an outer portion of an upper receiver; and a handguard that is configured to receive the barrel nut and the combined wedge assembly within a lower lip of the handguard. The wedge assembly may include an optional assembly screw and a locator pin where the top wedge member and bottom wedge member are tightly joined to each other via the assembly screw and the locator pin. In use, the lock-up system is used to join the handguard and barrel nut to a corresponding upper receiver with little to no play between the handguard and the upper receiver such that the connection between the two via the wedge assembly is intended to be permanent.