Firearm Bolt Carrier Guide Rods for Lightweight Receiver Design
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Solution Overview
Problem
Conventional firearm bolt carrier groups require precision machining of the receiver and lack part commonality due to the orientation and clearance issues of the cam pin, which restricts the use of lightweight materials and increases manufacturing complexity.
Innovation Solution
The bolt carrier group uses guide rods with notches and flutes to provide clearance for the cam pin, allowing it to translate and pivot within the bolt carrier, eliminating the need for a precision-machined receiver and enabling the use of lightweight materials like alloys or composites, while maintaining part commonality with existing designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bolt carrier groups use precision-machined receivers, then reliability and strength are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent introduces guide rods as intermediary components that bear the precision requirements, allowing the receiver to be made from lighter materials with less stringent machining requirements. The guide rods act as mediators between the bolt carrier group and the receiver, transferring the precision requirements from the receiver to the guide rods.
Solution Approach 2:
The patent segments the precision requirements from the receiver structure by introducing separate guide rod components. This segmentation allows the receiver to be simplified and made from lightweight materials, while the guide rods independently provide the necessary precision and stability for bolt carrier group operation.
2Stability of the object's composition
If the cam pin is positioned in conventional orientations, then structural stability is improved, but part commonality and ease of manufacture deteriorate
Solution Approach 1:
The patent repositions the cam pin from a lateral orientation to a vertical orientation, changing its dimensional arrangement within the bolt carrier group. This vertical positioning allows the cam pin to engage with the guide rod in a different spatial configuration, enabling part commonality across different firearm models while maintaining operational stability through the guide rod's structural support.
3Strength
If traditional receiver materials are used, then strength and durability are improved, but weight increases
Solution Approach 1:
The guide rods serve as intermediary load-bearing components that allow the receiver to use lightweight materials. The guide rods, which can be made from high-strength materials, carry the mechanical loads, enabling the receiver to be constructed from lightweight alloys or composites without compromising overall structural strength.
Solution Approach 2:
The patent enables the use of composite or lightweight alloy materials for the receiver by introducing guide rods that provide the necessary structural support. This allows the receiver to be made from materials optimized for weight reduction while the guide rods, potentially made from different materials, provide the required strength and precision.
Data Source
AI summary
A bolt carrier group for a firearm includes a bolt carrier, a bolt, and a cam pin. The bolt carrier includes a medial portion and a first and second outer portion. The bolt carrier slidably couples with a first elongated member at the first outer portion and a second elongated member at the second outer portion. The bolt is received within an inner volume of the bolt carrier. The cam pin is coupled with the bolt. The cam pin is positioned at least partially within the inner volume of the bolt carrier and extends through a top surface of the bolt carrier. The cam pin and the bolt are translatable and pivotable relative to the bolt carrier between a first position and a second position. The cam pin is configured to engage a recess of the second outer portion of the bolt carrier when in the first position.