Firearm Breech Block Locking Rod with Axial Play
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Solution Overview
Problem
Existing firearm breech designs face challenges in maintaining a consistent locking distance due to material stress and deformation, leading to potential safety issues and reduced shot precision from excessive barrel vibrations caused by varying cartridge dimensions.
Innovation Solution
A breech mechanism with a locking rod and compensating spring system that automatically adjusts the distance between the breech head and cartridge chamber, utilizing conical surfaces and mechanical or hydraulic means to maintain a secure and precise locking position, even with cartridges of different sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If locking elements are made of thin sleeve material to enable resilient effect, then ease of operation is improved, but strength deteriorates due to considerable material stress when cartridge is fired
Solution Approach 1:
The locking element is divided into multiple independent spring tongues (at least two) that are separated by longitudinal slots. Each spring tongue can deform independently under stress, distributing the material stress across multiple elements rather than concentrating it in a single thin-walled structure. This segmentation maintains the resilient effect while improving overall strength and stress distribution.
Solution Approach 2:
The locking elements are given axial play (axial movement capability) in addition to their radial resilient function. This adds a dimensional degree of freedom that allows the locking elements to accommodate stress through axial displacement, reducing the burden on the thin sleeve material and preventing deformation while maintaining operational resilience.
2Reliability
If locking elements are pressed against counter bearing by expanding cone, then reliability is improved through secure locking, but manufacturing precision deteriorates due to point loading and material deformation
Solution Approach 1:
The counter bearing is divided into multiple contact zones corresponding to each spring tongue. This segmentation distributes the contact force from the expanding cone across multiple discrete points on the counter bearing, preventing excessive point loading on any single locking element and reducing material deformation that would affect manufacturing precision.
Solution Approach 2:
The locking elements are designed with axial play, allowing them to move axially relative to the breech head. This additional degree of freedom enables the locking elements to self-adjust their position under load, compensating for variations in cartridge dimensions and maintaining consistent locking distance despite manufacturing tolerances.
3Ease of operation
If locking elements have radial resilient effect, then ease of operation is improved, but manufacturing precision deteriorates as individual elements are loaded at points causing material deformation and changing shutter distance
Solution Approach 1:
The locking elements are equipped with axial play, providing an additional degree of freedom in the axial direction. This allows the elements to compensate for point-loading deformations by adjusting their axial position, thereby maintaining consistent breech spacing despite the radial resilient deformation that occurs during operation.
Solution Approach 2:
The design allows the physical parameters of the locking elements (such as their position and deformation state) to change dynamically in response to operational conditions. The spring tongues can deform radially and move axially, adapting to varying loads from different cartridge dimensions while maintaining the critical breech spacing within acceptable tolerances.
4Device complexity
If conventional breech design is used, then device complexity is reduced, but reliability deteriorates due to excessive barrel vibrations from varying cartridge dimensions
Solution Approach 1:
The locking elements are given axial play, adding a degree of freedom in the axial direction to the conventional radial locking mechanism. This simple modification allows the system to automatically compensate for variations in cartridge dimensions, reducing barrel vibrations and improving shooting precision without significantly increasing device complexity.
Solution Approach 2:
The design enables dynamic adjustment of the locking parameters through the axial movement of spring tongues. This allows the breech to adapt to different cartridge dimensions and maintain consistent locking conditions, thereby improving reliability and shooting precision while retaining a relatively simple structural design.
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
Ensures safe and precise operation by minimizing breech spacing, reducing the risk of accidents, and enhancing shooting accuracy by compensating for dimensional tolerances and dynamic forces during firing.
Implementation Method 1
At least one compensating spring acts on the locking rod in the locked position in the direction of the cartridge chamber
Implementation Method 2
a locking rod that is axially movably mounted in the closure sleeve and is supported on a counter bearing via conical support surfaces
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The closure has a closure cover (5), and a closure head provided in an area facing a chamber at the closure cover, where the closure is connected with a barrel of a fire arm in a locking position. A ratch (4) is provided, by which the closure distance of the closure head to the chamber is independently reduced. A closure part is radially movable and consists of a control surface and a locking surface facing the ratch. An independent claim is also included for a fire arm with a closure.