Firearm Breech Mechanism Delaying Roller Retention
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Solution Overview
Problem
Existing automatic firearm breech mechanisms with roller-delayed designs often result in the delaying roller being lost during disassembly, as it is not securely attached to the breech mechanism.
Innovation Solution
An automatic firearm breech mechanism featuring a modified cage with a U-shaped strip and slide stops on its vertical walls, which surrounds the delaying roller, ensuring it remains integral to the breech mechanism and prevents it from falling out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the delaying roller is placed loosely between the rear vertical wall of the breech and the front vertical wall of the breech carrier, then the delaying roller can perform its function freely, but the delaying roller may fall out during disassembly and be lost
Solution Approach 1:
The delaying roller is nested within the cage structure, specifically positioned between the rear and front vertical walls of the cage. The cage acts as a container that holds the delaying roller, preventing it from falling out during disassembly while still allowing it to perform its delaying function. This nesting approach resolves the contradiction by providing both freedom of operation and secure retention.
Solution Approach 2:
The cage serves as an intermediary structure between the delaying roller and the external environment. It mediates between the need for the roller to move freely for functionality and the need to prevent it from falling out. The cage's design with the opening smaller than the roller's diameter provides this intermediary containment, solving the retention problem while maintaining operational freedom.
2Reliability
If the width of the opening in the cage is made smaller than the diameter of the delaying roller, then the delaying roller is prevented from falling out, but the cage structure becomes more complex
Solution Approach 1:
The cage is segmented into distinct functional elements: the U-shaped strip forming the main body, the opening for roller passage, and the slide stops at the vertical walls. This segmentation allows each element to perform its specific function - the U-shape provides structural support, the opening controls roller access, and the slide stops prevent roller escape. This modular segmentation achieves reliable retention without excessive overall complexity.
Solution Approach 2:
The cage is constructed from a strip bent into a U-shape, creating a thin-walled flexible structure. This approach uses a simple bent strip rather than a complex rigid assembly, reducing manufacturing complexity while maintaining the retention function. The thin-film nature of the bent strip allows easy fabrication while providing sufficient structural integrity to hold the roller.
Data Source
AI summary
An automatic firearm breech mechanism is provided that ensures that the delaying roller remains an integral part of the breech mechanism after removing the breech mechanism from the firearm. The automatic firearm breech mechanism may include a breech, a breech carrier, and a delaying roller that is positioned between a rear vertical wall of the breech and a front vertical wall of the breech carrier. The delaying roller may move vertically while between the rear vertical wall of the breech and the front vertical wall of the breech carrier. A modified cage may surround the working area of the delaying roller. The cage may be a strip bent into the shape of an inverted letter “U,” featuring an opening located on its horizontal wall, while its vertical walls are fitted with a slide stop at both ends.