Compact Cartridge Case with Tungsten Carbide Core
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Solution Overview
Problem
Firearm users face challenges with carrying interchangeable ammunition for rifles and pistols, as 5.56 rounds are too long for conventional pistols and 9 mm rounds lack stopping power for long distances, necessitating a single cartridge that can function in both firearms.
Innovation Solution
A cartridge case and projectile combination with a maximum length of 1.6 inches, featuring a rebated rim and specific dimensions to fit both rifles and handguns, using a tungsten carbide core for increased weight and density to maintain effective shooting distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If 5.56 rounds are used in rifles, then shooting distance and stopping power are improved, but the cartridge length becomes too long for conventional pistols
Solution Approach 1:
The patent changes the dimensional parameters of the cartridge case to create a compact configuration. The case length is reduced to 1.285 inches with a body length from web to shoulder of 0.7003 inches, allowing the cartridge to fit in pistol magazines while maintaining rifle-level performance through optimized case geometry and propellant placement
Solution Approach 2:
The patent employs a tungsten carbide core in the projectile, combining high-density material with a jacket structure. This composite construction increases the bullet weight to 124 grains in a compact form, providing enhanced stopping power and penetration capability while maintaining the reduced cartridge dimensions
2Length of moving object
If 9 mm rounds are used in pistols, then cartridge length is reduced for pistol compatibility, but stopping power becomes insufficient for long distances
Solution Approach 1:
The patent optimizes the case capacity and propellant charge parameters to deliver rifle-level muzzle energy from a pistol-length cartridge. The case volume and powder charge are carefully calibrated to achieve high velocity and energy output despite the compact 1.285-inch case length, enabling the round to function effectively in both pistols and rifles
Solution Approach 2:
The tungsten carbide core provides superior density and weight concentration, allowing the projectile to maintain momentum and penetrating power at extended ranges. The high-density core enables the round to retain rifle-level stopping power while accommodating the reduced cartridge dimensions required for pistol compatibility
3Ease of operation
If separate ammunition types are carried for rifles and pistols, then each firearm can be optimized, but the user must choose the wrong amount of each ammunition type
Solution Approach 1:
The patent designs a universal cartridge that can be fired in both pistols and rifles using standard magazines for each platform. The cartridge dimensions and feeding characteristics are optimized to work with both pistol and rifle magazine systems, allowing users to carry a single ammunition type for both firearm types and eliminating the need to choose between different ammunition quantities
Data Source
AI summary
A cartridge case and projectile combination having a maximum length of 1.6″. The cartridge case to receive a projectile has a rebated rim of a 0.535″ diameter, body length from web to shoulder of 0.7003″, a case shoulder angle of 42°, a longitudinal distance between said shoulder and neck of 0.1557″, a case neck length of 0.229″, a mouth. The cartridge case has a total case length of 1.285″. The projectile includes a front section having a length of 0.315″ that extends past said cartridge case and a back section from the front section to a base of the projectile that fits inside of the case at the mouth.