Delayed Blowback Firearm Bolt Mechanism
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Solution Overview
Problem
Conventional blow-back systems in firearms are limited in using higher power magnum cartridges due to inadequate delay in the operation of the blow-back system.
Innovation Solution
A delayed blow-back system for auto-loading firearms that includes a bolt passage, an elongated barrel with a gas aperture, an energy transmission facility, and a latch element that moves from a locked to an unlocked position in response to rearward motion, allowing the bolt to reciprocate and enabling the use of higher powered cartridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional blow-back system is used, then the firearm can operate with simple mechanism, but it cannot handle higher power magnum cartridges due to insufficient delay
Solution Approach 1:
The blow-back system is segmented into distinct functional components: a bolt assembly, a separate delay mechanism including a piston and hydraulic damper, and a linkage system. This segmentation allows the delay function to be added without completely redesigning the entire bolt system, enabling magnum cartridge capability while managing complexity through modular design.
Solution Approach 2:
A hydraulic damper acting as a piston serves as an intermediary element between the chamber pressure and the bolt movement. This intermediary delays the bolt's rearward motion by controlling the flow of gas or fluid through the piston, providing the necessary delay for magnum cartridges without requiring direct modification of the bolt itself.
2Reliability
If the bolt unlocks immediately after firing, then the mechanism operates quickly, but high pressure from magnum cartridges causes premature unlocking and safety issues
Solution Approach 1:
The piston with hydraulic damper acts as a time-delay intermediary, mediating between the instantaneous high pressure of magnum cartridge firing and the bolt unlocking action. The hydraulic resistance in the piston creates a controlled delay, ensuring the bolt remains locked during the high-pressure phase before unlocking safely.
Solution Approach 2:
The hydraulic damper allows adjustment of the delay period by changing fluid viscosity, damper orifice size, or piston surface area. This parameter control enables optimization of the delay time to match specific magnum cartridge pressure profiles, ensuring reliable safe operation while minimizing unnecessary delay.
3Adaptability or versatility
If a delay mechanism is added to enable magnum cartridges, then cartridge power capability improves, but the device complexity increases
Solution Approach 1:
The delay mechanism components (piston, hydraulic damper, seals) are merged into the existing bolt assembly structure. The piston is integrated within the bolt body or as a component of the bolt carrier, and the hydraulic damper is incorporated into the existing gas system, reducing the need for separate discrete components and minimizing overall system complexity.
Solution Approach 2:
The piston assembly serves multiple functions: it acts as both the delay mechanism element and a seal for the chamber, while also serving as a mounting point for other bolt components. The hydraulic damper structure is designed to fulfill both its delay function and structural support roles, reducing the total component count and simplifying the overall system.
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 effectively delays the operation of the blow-back system, allowing the use of higher powered magnum cartridges by ensuring the bolt remains locked until sufficient pressure is reached, then unlocking to allow reciprocation, thereby enhancing the firearm's operational capacity.
Implementation Method 1
an elongated barrel connected to the frame, the barrel defining a gas aperture at an intermediate position along the length of the barrel, an energy transmission facility having a first end communicating with the gas aperture
Data Source
AI summary
An auto-loading firearm has a frame defining a bolt passage, a bolt operable to reciprocate between a battery position and a retracted position, a barrel defining a gas aperture, an energy transmission facility having a first end communicating with the gas aperture and an opposed second end, the bolt having a bolt body and a bolt key movable with respect to the bolt body between a forward position and a rearward position, the bolt key operably engaging the second end of the energy transmission facility when the bolt is in the battery position, the bolt including a latch element operably engaged to the bolt key having a locked position to prevent reciprocation of the bolt, and an unlocked position in which reciprocation of the bolt is enabled, and the latch element being responsive to rearward motion of the bolt key to move from the locked position to the unlocked position.