Adjustable Gas Key for Bolt Carrier Reliability
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Solution Overview
Problem
Conventional gas-operation systems in firearms lack the ability to adjust the force of the blowback, leading to unreliable operation due to variations in propellant gas amounts caused by different ammunition, suppressor use, and manufacturing inconsistencies, resulting in issues like short stroke and improper ejection of spent shells.
Innovation Solution
An adjustable gas key integrated with the bolt carrier, featuring a base portion, tube portion, inlet and outlet passages, and an adjustment device that modifies the inner volume to control the flow of propellant gas, allowing users to adjust the recoil force and ensure proper ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fixed gas key is used, then the structure is simple, but the recoil force cannot be adjusted leading to unreliable operation with different ammunition
Solution Approach 1:
The gas key transitions from a fixed structure to an adjustable structure. The adjustable gas key includes an adjustment device that allows the inner volume to be modified, enabling the system to adapt to different ammunition types and suppressor configurations dynamically rather than being fixed at manufacturing.
Solution Approach 2:
The invention changes the physical parameter of the gas key's inner volume. By adjusting the inner volume of the gas key, the system can optimize gas flow characteristics for different ammunition types, suppressing the recoil force when using high-power ammunition and allowing full power when using standard ammunition.
2Force
If the inner volume of the gas key is increased, then the gas flow and recoil force are enhanced, but the ejection force may become excessive causing improper shell ejection
Solution Approach 1:
The adjustment device enables dynamic control of the inner volume, allowing the user to optimize the balance between recoil force and ejection force. This dynamic adjustment ensures that the gas pressure is sufficient to cycle the action reliably while also providing enough force to eject spent shells properly, preventing both short-stroking and ejection failures.
3Reliability
If the gas key is made adjustable with an adjustment device, then the recoil force can be optimized, but the device complexity increases
Solution Approach 1:
The adjustment device is integrated directly into the gas key structure, merging the adjustment function with the gas key itself. This integration eliminates the need for separate external adjustment mechanisms, reducing overall system complexity while maintaining the ability to adjust the inner volume for optimized reliable operation across different ammunition types.
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 adjustable gas key enables precise adjustment of the recoil force, addressing variations in propellant gas and ensuring reliable operation by optimizing the ejection of spent shells, regardless of ammunition type or manufacturing variations.
Implementation Method 1
a portion of high pressure gas from the cartridge being fired is used to power a mechanism
Implementation Method 2
propellant gas produced by firing the firearm is directed through the gas tube and through the inlet passage and exits through the outlet passage
Implementation Method 3
the adjustment device adjusts a size of the inner volume
Data Source
AI summary
A bolt carrier with integral adjustable gas key for use with a firearm is provided. The adjustable gas key includes a base portion and a tube portion coupled to the base portion. An inlet passage extends through the tube portion and an outlet passage angled from the inlet passage exits through the base portion. The adjustable gas key includes an inner volume located at a junction of the inlet passage and the outlet passage. The adjustable gas key also includes an adjustment device operatively coupled to the adjustable gas key, wherein the adjustment device adjusts a size of the inner volume. The adjustable gas key is integral and unitary with a bolt carrier of the firearm, wherein adjustment of the size of the inner volume adjusts the force of action of the bolt carrier.