Rifle Receiver Slit Expansion for Contaminant-Tolerant Barrel Assembly
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Solution Overview
Problem
Conventional rifle receiver designs face challenges in convenient and prompt reassembly, especially in outdoor or combat situations, due to precise dimension requirements and minimal resiliency, which can be hindered by contamination, leading to delays and potential risks.
Innovation Solution
The introduction of a rotatable bolt mechanism with an abutment member, such as a dowel, that extends the slit gap in the rifle receiver's hollow chamber, allowing for a larger cross-sectional dimension and easier assembly even with contaminants, by leveraging the interaction between the dowel and bolt to increase the slit's opening beyond standard dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hollow chamber dimensions are precisely matched with the rifle barrel end, then shooting accuracy is optimized, but assembly becomes difficult when contaminants are present
Solution Approach 1:
The patent applies the dynamics principle by making the hollow chamber dimensions adjustable rather than fixed. The chamber can dynamically change its internal diameter between a first dimension for precise assembly and a second dimension for optimal shooting accuracy, allowing it to adapt to different operational states (assembly vs. operation).
Solution Approach 2:
The patent implements parameter changes by varying the internal dimension of the hollow chamber. A first parameter (larger dimension) facilitates easy assembly even with contaminants present, while a second parameter (precise dimension) ensures optimal shooting accuracy. The system transitions between these parameter states based on operational requirements.
2Manufacturing precision
If the slit opening is minimal for precision, then accuracy is maintained, but assembly is hindered by contaminants
Solution Approach 1:
The slit opening is made dynamic rather than static. It can open to a first position with larger dimensions to accommodate contaminants during assembly, then close to a second position with minimal dimensions to maintain precision during operation. This dynamic adjustment resolves the contradiction between precision and contaminant sensitivity.
Solution Approach 2:
The patent changes the geometric parameter of the slit opening between two states: a first opening parameter that allows contaminant passage and a second opening parameter that ensures precise mating. This parameter transition allows the system to be insensitive to contaminants during assembly while maintaining precision during use.
3Ease of operation
If cleaning is performed to remove contaminants, then assembly becomes possible, but time is lost which is critical in field situations
Solution Approach 1:
The patent converts the harmful effect of contaminants into a beneficial feature by designing the hollow chamber and slit to actively accommodate and guide contaminants away from critical mating surfaces. The enlarged first dimension and positioning of the slit allow contaminants to be naturally excluded during assembly without requiring cleaning operations, thus eliminating time loss.
Solution Approach 2:
The design incorporates preliminary protective features in the form of the enlarged first dimension and strategically positioned slit that prevent contaminant interference before assembly occurs. This preliminary design consideration eliminates the need for subsequent cleaning actions, allowing immediate assembly even in contaminated field conditions.
Data Source
AI summary
A rifle receiver arrangement including a hollow chamber with a silt to receive an end of a rifle barrel. A slit opening/closing arrangement including an abutment member to abut against a rotatable bolt once the rotatable bolt is rotated in a second direction beyond a first open position such that upon abutment between the rotatable bolt and the abutment member, further rotation of the rotatable bolt in the second direction increases the gap of the slit of the hollow chamber to provide an extended open position to allow the end of the rifle barrel to be accepted less restrictively into the hollow chamber.