Marking Projectile Frangible Cap Segmentation
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Solution Overview
Problem
Conventional marking cartridges face issues with accuracy and reliability due to brittle frangible shells that crack during loading, inadequate engagement with firearm rifling, and inconsistent marking media distribution, leading to reduced accuracy and potential operational failures in firearms.
Innovation Solution
A marking cartridge design featuring a frangible cap portion and a durable projectile body with a hermetic seal system, including a curled lip to eliminate air bubbles and excess media, and a telescoping slide to compensate for reduced propellant blowback, ensuring proper ejection and loading mechanisms operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frangible shell is used to encase marking media, then the marking media can be effectively conveyed to the impact point and released, but the shell becomes brittle and may crack or shatter during loading, depositing marking media and shell material within the firearm
Solution Approach 1:
The projectile is divided into a frangible cap portion containing the marking media and a durable base portion. The frangible cap is designed to fracture on impact to release marking media, while the durable base provides structural strength for loading and firing. This segmentation allows each portion to have optimized properties for its specific function without compromising the other.
Solution Approach 2:
Different portions of the projectile have different material properties: the frangible cap is made with brittle, frangible material optimized for marking media release, while the base portion is made with durable material optimized for structural strength. This local differentiation of material quality resolves the contradiction between frangibility and strength.
2Reliability
If a frangible shell is used, then the marking media can be released on impact, but the shell may not optimally engage the rifling of the barrel, reducing accuracy
Solution Approach 1:
The projectile is segmented into a frangible cap for marking media release and a durable base with optimized rifling engagement surfaces. The durable base maintains structural integrity during firing to ensure precise engagement with the barrel rifling, while the frangible cap is optimized for reliable marking media release on impact.
Solution Approach 2:
The base portion is made with durable material providing optimal surface quality and structural properties for rifling engagement, while the frangible cap uses brittle material optimized for fracture and marking media release. This local quality differentiation ensures both precise rifling engagement and reliable marking media release.
3Strength
If lightweight materials are used in marking projectiles, then the projectile can be frangible on impact, but the environmental factors such as wind have increased effect on the flight path, decreasing accuracy
Solution Approach 1:
The projectile is segmented into a lightweight frangible cap for impact fracture and a heavier durable base for structural stability. The heavier base counteracts environmental factors during flight, while the frangible cap maintains the ability to fracture on impact for marking media release.
Solution Approach 2:
Different portions have different material densities and strengths: the frangible cap uses lightweight brittle material for impact fracture, while the base uses heavier durable material for flight stability. This local quality differentiation resolves the contradiction between frangibility and flight accuracy.
4Ease of manufacture
If marking media is loosely packed in the projectile, then loading is easier, but air bubbles or uneven distribution cause the projectile to cork screw in flight, reducing accuracy
Solution Approach 1:
The marking media is pre-formed into a cohesive mass or cartridge before insertion into the projectile. This preliminary preparation ensures uniform distribution and eliminates air bubbles, while still allowing for relatively easy loading into the projectile cavity.
Solution Approach 2:
The marking media is contained within a flexible capsule or membrane that maintains its shape and prevents air bubble formation. This flexible containment allows the media to be loaded while maintaining uniform distribution and preventing cork-screw flight.
5Duration of action of stationary object
If non-solid marking material is stored in the projectile for long periods, then the marking media remains ready for use, but the material may leak from stored conventional marking cartridges, rendering them useless or hazardous
Solution Approach 1:
The marking media is sealed within a flexible capsule or membrane that provides hermetic containment. This flexible barrier prevents leakage during storage while allowing the media to remain in a ready-to-use non-solid state, resolving the contradiction between storage duration and containment integrity.
Solution Approach 2:
The containment system uses composite construction with the flexible capsule providing leakage prevention and the surrounding projectile structure providing mechanical protection. This composite approach ensures both long-term storage stability and prevention of hazardous leakage.
6Weight of moving object
If less propellant is used to propel the lighter marking projectile, then the propellant load is reduced, but the blowback may be insufficient to operate the ejector mechanism of a conventional firearm
Solution Approach 1:
A telescoping slide mechanism is introduced as an intermediary between the propellant gases and the ejection system. The slide is propelled by the propellant blowback and transfers this motion to the ejection mechanism, amplifying the effect of the reduced propellant load to ensure reliable operation of the ejection system.
Solution Approach 2:
The direct mechanical connection between propellant blowback and ejection mechanism is replaced with a telescoping slide system that converts the linear propellant force into effective ejection motion. This mechanical substitution allows the lighter projectile with less propellant to still operate the ejection mechanism reliably.
Data Source
AI summary
Marking cartridge for conventional firearms that deposits marking media on impact with a target. The marking cartridge generally comprises a marking projectile containing a quantity of marking media beneath a frangible cap portion and having a more durable exterior surface adapted to engage the rifling of the barrel when fired. The marking projectile also may comprise a receptacle for marking media having a curled lip adapted to remove air during assembly and excess marking media to insure a consistent quantity of marking media is contained within the marking projectile. The receptacle defining a marking media cavity radially spaced from exterior bearing portion wall and having a mushroom shape. The marking cartridge also may comprise an extendable casing.