Dummy Ammunition Round Matching Live Fire Weight and Center of Gravity
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Solution Overview
Problem
Existing methods for simulating live ammunition in firearms lack fidelity in matching the weight and center of gravity of live rounds, leading to reduced durability and potential misfunctioning during testing, especially in belt-fed weapons, and pose safety concerns due to the use of live ammunition or incomplete inert components.
Innovation Solution
A dummy ammunition round is designed to exactly match the weight and center of gravity of live ammunition by using data from CAD software or experimental methods, with internal cavities and external dimensions tailored to replicate the live round's characteristics, allowing for durable and authentic simulation through materials like steel or brass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inert ammunition is built by omitting the energetic components (primer and propellant), then safety is improved, but fidelity and durability are reduced
Solution Approach 1:
The invention extracts and removes the harmful energetic components (primer and propellant) from the ammunition while retaining the external shell and internal cavity structure. This extraction achieves safety by eliminating the hazardous elements that could cause unintended firing or injury, while the remaining structural components maintain durability for repeated cycling through firearms.
Solution Approach 2:
The invention applies different properties to different parts of the ammunition: the external shell maintains the original ammunition's structural integrity and durability characteristics, while the internal cavity is designed to be inert and non-functional. This local differentiation allows the projectile shell to withstand repeated handling and cycling while the internal space prevents any harmful energetic reactions.
2Reliability
If inert filler is included in the cartridge case, then durability is improved, but fidelity in matching mass and center of gravity is reduced
Solution Approach 1:
The invention changes the physical parameters of the inert filler material to match the mass and center of gravity of the original propellant. By carefully selecting and positioning inert materials with specific densities and volumes within the cartridge case, the invention achieves faithful replication of the original ammunition's mass characteristics while maintaining durability through the presence of filler material.
3Reliability
If solid inert items are made from materials like aluminum or polymer, then durability is improved, but fidelity in matching mass and center of gravity is reduced
Solution Approach 1:
The invention uses composite material construction, combining a durable external shell made from materials like aluminum or polymer with internal filler materials that adjust the overall mass and center of gravity. This composite approach allows the exterior to provide durability and resistance to deformation while the internal composition is tuned to match the mass characteristics of the original ammunition, resolving the contradiction between durability and mass fidelity.
Data Source
AI summary
Method of fabricating a dummy practice ammunition round to dynamically match behavior of an existing live ammunition round during manually cycling of the action, or other demonstration. A dummy practice ammunition round of identical contour is formed, having a center of gravity (mass) in the same position as on the existing live ammunition round. Weight is matched by removing or omitting material through coring into the case head of the round or by hollowing it out.