Metal Upper Receiver Thermal Stability for Firearms
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Solution Overview
Problem
Existing upper receivers for firearms made of plastic materials deform under heat stress, leading to misalignment and potential malfunctions during sustained fire.
Innovation Solution
A metal-based upper receiver design featuring a rail block with integrated breech-carrier guide and sight anchor, securely screwed to a metal supporting part and barrel bushing, preventing material drift and malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the upper receiver is made of plastics material, then the weight is reduced and manufacturing is simplified, but the material deforms under heat stress causing misalignment and malfunction
Solution Approach 1:
The upper receiver combines metal components (supporting part, rail block, barrel bushing) with plastic elements to create a composite structure. The metal parts provide thermal stability and structural integrity under heat stress, while the plastic components can be used for non-critical structural elements or replaced with metal where needed, achieving both weight reduction and reliability under thermal conditions.
2Ease of manufacture
If the upper receiver is made of plastics material, then manufacturing is simplified, but the material deforms under heat stress causing misalignment
Solution Approach 1:
By using metal supporting parts, rail blocks, and barrel bushings instead of or in combination with plastic, the structure maintains dimensional stability and alignment precision under heat stress. The metal components resist thermal deformation, ensuring that critical dimensions and alignments are maintained even during sustained fire operations.
Solution Approach 2:
The upper receiver is divided into separate metal components (supporting part, rail block, barrel bushing) that can be manufactured independently with high precision and then assembled. This segmentation allows each component to be optimized for its specific function and thermal characteristics, improving overall manufacturing precision while maintaining ease of assembly.
3Device complexity
If separate parts are embedded in the upper receiver, then the structure is simplified, but material drift occurs causing misalignment
Solution Approach 1:
The rail block integrates multiple functions into a single component: it provides the guide for the breech carrier on its underside and the anchor for the sight on its upper side. This merging eliminates the need for separate embedded parts that could drift, as the integrated metal structure maintains fixed relative positions of all critical components, preventing material drift and misalignment.
4Duration of action of moving object
If the firearm is used for sustained fire, then operational capability is maintained, but the plastics material deforms causing malfunction
Solution Approach 1:
The use of metal supporting parts, rail block, and barrel bushing creates a thermally stable structure that can withstand the heat generated during sustained fire operations. Metal materials have higher melting points and lower thermal expansion coefficients compared to plastics, allowing the firearm to maintain operational reliability for longer durations under thermal stress without deformation or malfunction.
Data Source
AI summary
The invention relates to an upper receiver for a firearm, comprising a supporting part, which supports a barrel bushing for receiving a barrel, a guide for a longitudinally movable breech carrier, and an anchor for a sight. The guide for the breech carrier is formed on the underside of a rail block preferably made of metal which has the anchor for the sight on its upper side, and the supporting part is also preferably made of metal and mounted both to the barrel bushing and to the rail block via removable fasteners.