Safety Round with Tab for Instant Ejection
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Solution Overview
Problem
Conventional firearm safety rounds are not compatible with the SAR 21—Singapore Assault Rifle-21st Century, as they fail to eject instantly from the firing chamber, and existing plugs for 0.223 and 5.56×45 mm cartridges are not suitable for this firearm, while also not working with the M-16 rifle.
Innovation Solution
A specially designed firearm safety round with a cylindrical rear end, a truncated mid-section, and a tab that extends outward to visually indicate the chamber's status, ensuring proper alignment with the extractor and ejection port, allowing instant ejection and compatibility with both the SAR 21 and M-16 rifles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional safety rounds are used in SAR 21 firearms, then the firearms can be marked as safe, but the safety rounds cannot be ejected instantly from the firing chamber
Solution Approach 1:
The safety round is segmented into distinct functional parts: a rim for extractor engagement, a truncated mid-section for chamber alignment, and a tab for visual indication. This segmentation allows each part to fulfill its specific function optimally, enabling both reliable safety indication and instant ejection through proper interaction with firearm components.
Solution Approach 2:
The safety round employs asymmetric geometry with flat sides on the mid-section rather than a fully circular cross-section. This asymmetry creates specific alignment features that interface with the extractor and chamber geometry of SAR 21 firearms, ensuring proper orientation and instant ejection while maintaining safety indication functionality.
2Adaptability or versatility
If conventional safety rounds are designed for 0.223 and 5.56×45 mm cartridges, then they work with those cartridge types, but they are not suitable for SAR 21 firearms
Solution Approach 1:
The safety round design incorporates universal features that allow it to function across different firearm platforms. The standardized rim diameter enables compatibility with both SAR 21 and M-16 firearms, while the asymmetric mid-section and tab configuration provide the additional functionality needed for SAR 21 specific requirements, achieving multi-platform universality.
Solution Approach 2:
Different parts of the safety round have specialized local properties: the rim provides universal extractor engagement, the truncated mid-section with flat sides provides SAR 21 specific alignment and ejection characteristics, and the tab provides visual indication. This local quality differentiation allows the single design to satisfy multiple firearm platform requirements.
3Productivity
If a safety round is designed with proper alignment features for SAR 21, then it ejects instantly, but it may not work with M-16 rifle
Solution Approach 1:
The safety round achieves universality by incorporating the M-16 compatible rim diameter as its base feature, ensuring compatibility with that platform. The additional asymmetric features (truncated mid-section and tab) are designed to be non-interfering additions that provide SAR 21 functionality without compromising M-16 operation, allowing one design to serve multiple firearm types.
Data Source
AI summary
A firearm safety round configured to function as a safety round for the following firearms: SAR 21—Singapore Assault Rifle-21st Century and M-16 rifle. The safety round includes a cylindrical rear end having a rim, a mid-section adjacent the rear end opposite the rim, the mid-section comprises a truncated cylinder having opposite flat sides, a tab extending outwardly from the mid-section and configured so that when the safety round is received by the firing chamber, the tab will extend out of the firing chamber to visually indicate that the firing chamber of the firearm is free of live ammunition and a cylindrical nose portion extending from the mid-section, opposite from the rear end and longitudinally aligned therewith. When the safety round is installed in the firing chamber of the firearm, one of the flat sides rests on the firing chamber and positions the rim in alignment with the extractor, and the flat sides configure the mid-section so that a largest dimension of the mid-section is smaller than a height of the extraction port of the firearm.