Delayed Blowback Spring System for Pistol Firearms
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Solution Overview
Problem
Conventional spring-mass bolt systems in blowback action firearms experience uncontrolled impacts and material stress due to sudden force spikes during recoil, which can lead to reduced precision and potential damage.
Innovation Solution
A spring system incorporating a guide rod, control piece, pusher piece, and roller bodies that allows for simultaneous, play-free movement of closing parts and housing, distributing the recoil force smoothly to prevent force spikes and enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional spring-mass bolt systems are used in blowback action, then the bolt can move backward due to gas pressure, but sudden force spikes and shock-like impacts occur during recoil
Solution Approach 1:
The patent introduces a control piece as an intermediary component between the bolt and the housing. This control piece mediates the recoil force transmission, smoothing out the force profile and eliminating sudden force spikes. The control piece moves with the bolt during recoil but controls the timing and manner of force transmission to the housing, converting abrupt impacts into controlled, distributed forces.
Solution Approach 2:
The control piece is pre-positioned and prepared to engage with the housing at the optimal moment during recoil. By anticipating the recoil event and being ready to control the force transmission in advance, the system prevents harmful force spikes before they can damage the mechanism. The control piece's positioning and preparation enable smooth force distribution from the start of recoil.
2Speed
If the bolt moves backward quickly to eject the cartridge shell, then ejection speed is improved, but material stress and potential damage increase
Solution Approach 1:
The control piece serves as a mediator that allows the bolt to move backward quickly for efficient cartridge ejection while preventing excessive material stress. By controlling the force transmission timing and distribution, the control piece enables high-speed bolt movement without transmitting harmful peak forces to the housing and other components, thus protecting the material integrity while maintaining ejection speed.
3Manufacturing precision
If delayed blowback action is implemented with rigid barrel locking, then precision is improved, but device complexity increases
Solution Approach 1:
The control piece is designed as a multi-functional component that performs several functions: it controls the timing of bolt movement, manages force distribution, enables delayed blowback action for precision, and reduces mechanism complexity. By consolidating multiple functions into a single control piece, the patent achieves precise delayed blowback action without proportionally increasing the overall device complexity.
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 spring system ensures controlled recoil distribution, reducing material stress and improving precision by eliminating shock-like impacts and force spikes, enabling retrofitting of conventional spring-mass bolt systems into delayed blowback action.
Implementation Method 1
The stored spring energy increases as the compression of the spring increases. When the bolt has discharged all its kinetic energy to the spring or impacts against a stop and in this way comes to be in its rear dead point, it is accelerated forward again by the spring
Implementation Method 2
a control piece connected to a pusher piece, between which there are at least two roller bodies
Data Source
AI summary
A spring system for blowback action is provided with a control piece (2) and pusher piece (3) supported so that it can be displaced on the guide rod (7). On its end, a buffer (4) is arranged with a buffer spring (6). The guide rod (7) is also used for guiding the closing spring (8). Between the control piece (2) and pusher piece (3) there are five rollers (10) in a recess (9) of the guide rod (7), and these rollers cause a delay of the action during the blowback after the discharge of a shot.