Unitary Shell Firearm Receiver Design
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Solution Overview
Problem
Conventional belt-fed machine guns are heavy due to their construction from multiple assembled metal parts, leading to increased weight, potential for corrosion, and manufacturing complexities, which affect durability and accuracy.
Innovation Solution
The firearm is designed with a unitary first and second shell forming a receiver chamber, where each shell has a peripheral rim connected to create a single, enclosed structure with elongated ribs for added strength, eliminating seams and rivets, and allowing for precise machining without warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional box-like receivers are assembled from separate metal parts with overlapping plates and rivets, then structural strength and durability are achieved, but the firearm weight increases significantly
Solution Approach 1:
The patent merges multiple separate metal plates and riveted components into a single unitary receiver structure. The receiver is formed as one integral piece of metal, eliminating the need for overlapping plates, rivets, and multiple fastening elements, thereby significantly reducing firearm weight while maintaining structural strength.
Solution Approach 2:
The unitary receiver is designed with integrated functional segments including the barrel passage, bolt guides, charging handle guides, and magazine well all formed as part of the single monolithic structure. This segmentation within unity allows complex functionality without requiring separate assembled parts.
2Stability of the object's composition
If multiple separate components are assembled with overlapping plates and rivets, then structural integrity is achieved, but the number of parts requiring inventory and assembly increases
Solution Approach 1:
The patent combines numerous separate receiver components (side plates, bottom plate, top plate, reinforcing strips, L-bars) into a single unitary receiver structure. This eliminates the need to inventory, store, and assemble multiple individual parts, simplifying manufacturing and field repair while maintaining structural integrity.
3Strength
If sheets of metal are overlapped and riveted together, then adequate strength and wear resistance are achieved, but seams and gaps create opportunities for corrosion
Solution Approach 1:
The patent eliminates all seams, gaps, and overlapping joints by forming the receiver as a single unitary structure. This monolithic construction removes the crevices where moisture could accumulate and cause corrosion, significantly improving reliability and extending the firearm's service life while maintaining the necessary strength.
4Ease of manufacture
If conventional plate fabrication is used, then manufacturing is simplified, but dimensional errors may accumulate due to imprecision of assembling components
Solution Approach 1:
The patent produces the receiver as a single unitary component, eliminating cumulative dimensional errors that occur when assembling multiple separate parts. The monolithic construction ensures precise dimensional relationships between all functional features (bolt guides, barrel passage, charging handle guides) without the tolerance stacking inherent in multi-component assembly.
5Reliability
If heat-treating and coatings are applied to assembled components, then durability is improved, but dimensions may shift due to warpage
Solution Approach 1:
The patent applies heat-treating and protective coatings to the unitary receiver as a single piece, eliminating warpage and dimensional shifts that occur when treating multiple separate components. The monolithic structure ensures uniform thermal distribution and consistent dimensional stability throughout the receiver after heat treatment.
6Reliability
If conventional box construction with internal bolt guides and external reinforcing portions is used, then operational reliability is achieved, but the firearm weight increases
Solution Approach 1:
The patent integrates all bolt guides, charging handle guides, and reinforcing portions directly into the unitary receiver structure. These functional features are formed as part of the single monolithic receiver rather than separate added components, eliminating the weight of additional metal sheets, rivets, and fastening elements while maintaining operational reliability.
Data Source
AI summary
A firearm has a body formed of a unitary first shell and a unitary second shell. Each shell defines an open cavity and has a peripheral rim. The rims of the shells are connected together so that the cavities define a receiver chamber. A bolt reciprocates within the receiver chamber, and a barrel connected to the shells has a chamber positioned for operable engagement by the bolt. The shells may together define a gas tube, and may define a barrel receiving element, each shell having a barrel engagement element. Each shell may have a side panel with flat portions having a limited thickness, and elongated ribs of a greater thickness. The ribs may extend about the periphery of planar side panels, and may extend between the periphery and selected stress elements on the body including a buttstock mounting facility. A bolt handle slot may have opposed rows of spaced apart bolt handle guides in an alternating arrangement.