Alternating Roll-Taper Crimps for Multi-Projectile Cartridges
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Solution Overview
Problem
Conventional cartridges pose health risks due to lead content, offer limited projectile capacity, and lack precision in self-defense scenarios, often requiring larger firearms or reduced effectiveness in semi-automatic handguns.
Innovation Solution
A cartridge design featuring multiple wadcutter projectiles, a lead-free composition, and a crimping mechanism with alternating roll and tapered crimps to ensure proper seating and controlled projectile spread, compatible with existing firearms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple projectiles are included in a cartridge, then stopping power and accuracy are improved, but device complexity increases
Solution Approach 1:
The cartridge includes multiple separate projectile elements (typically two projectiles) within a single case, allowing each projectile to be independently positioned and secured. This segmentation enables multiple impacts on target while maintaining manageable cartridge dimensions and complexity through systematic arrangement.
Solution Approach 2:
Multiple projectiles are combined within a single cartridge case that shares common components (primer, propellant, case structure). This merging approach consolidates what would otherwise be separate cartridges into one unit, achieving multiple shots per cartridge without proportionally increasing overall complexity.
2Reliability
If wadcutter projectiles are used in semi-automatic handguns, then accuracy and damage capability are improved, but reliability of cycling deteriorates
Solution Approach 1:
The wadcutter projectile features a specialized flat-front geometry localized to the nose portion, while the rest of the cartridge components (case, rim, overall dimensions) maintain conventional qualities. This localized modification provides enhanced accuracy and target engagement without compromising the overall cycling reliability of the semi-automatic firearm.
Solution Approach 2:
The projectile design parameters are modified to include a flat-front wadcutter shape with specific dimensional relationships (flat face diameter, overall length, base diameter) that optimize both accuracy and cycling. The crimping parameters are also adjusted to ensure proper seating while maintaining reliability.
3Object-affected harmful factors
If lead-free composition is used, then safety and environmental impact are improved, but manufacturing complexity increases
Solution Approach 1:
The projectile is constructed from non-lead materials such as copper, steel, or other safe alloys that provide comparable ballistic performance. These composite material substitutions eliminate toxic lead while maintaining structural integrity and manufacturability through established metalworking processes.
Data Source
AI summary
A cartridge for a firearm, including a projectile, a gas check, a case, a propellant, and a primer configured to ignite the propellant. The propellant is arranged between the gas check and an end surface of the case in which the primer is arranged. The case is crimped against the projectile. The case includes an open end with discrete roll crimps distributed along a circumference of the open end. The case further includes tapered crimps between the roll crimps along the circumference of the open and. The open end alternates between tapered and roll crimps along the entire circumference of the open end. Each of the roll crimps and tapered crimps are crimped to the projectile.