US 5,216,199 A · Lead-free primed rimfire cartridge

Abstract

A method of manufacturing an improved lead-free primed rimfire cartridge for ammunition or industrial powerloads providing a gas source for driving fasteners with power-fastening tools. A lead-free priming mixture is consolidated into an annular cavity of a rimfire casing and dried in the cavity. The primer is secured in the cavity by tamping at least a portion of propellant into the casing against and over the dried primer. The tamping pressure per casing may range from 1,300 psi to 8,800 psi. Any remaining portion of required propellent is added over the tamped compacted propellant layer. The ammunition and powerload casings are then sealed and finished in a conventional manner. A rimfire cartridge for both ammunition and industrial powerload applications manufactured as described above is also provided.

Claims13

Dependent claims

A rimfire cartridge comprising:

a generally cylindrical rimfire casing having a cylindrical wall, an enclosed end, an an opposing end, with the enclosed and defining therein a rimfire primer annular cavity;
a primer consolidated into, dried and secured within the annular cavity, said primer having a lead-free compositoin comprising diazodinitrophenol, tetracene, propellant, glass, and strontium nitrate;
a predetermined amount of propellant overlying the dried primer in the casing, the predetermined amount of propellant comprising a metered amount of a first propellant tamped at a predetermined pressure of between 1,300-8,800 psi into the casing to form a first propellant layer to secure the dried primer within the annular cavity;
and
sealing mans for sealing the opposing end of the casing.

2 more elements

Dependencies are inferred from the claim text.

Lead-free primed rimfire cartridge

Life of this patent

Lead-free primed rimfire cartridge

Life of this patent

Abstract

Claims13