THIN WALLED, TWO COMPONENT CARTRIDGE CASING
First Claim
1. A casing for cartridge ammunition, the casing having a head end and an interior volume for containing propellant comprising:
- a) a generally cylindrical sleeve portion that forms the sidewall of the casing with a casing sidewall inner surface, the casing being further substantially closed at the head end by a casing end panel having a circumferential boundary joined with the sidewall, the casing end panel having a centrally located end panel opening to receive a primer, andb) an inner reinforcing plug seated against the head end to provide support to the casing against the high pressures experienced in the firing of the ammunition, the inner plug having a primer recess formed therein and aligned with said end panel opening to receive a primer, the recess being provided with one or more perforations through the inner plug to permit gas from the primer to enter into the interior of the casingwherein the inner plug extends laterally between the primer well recess and the casing sidewall whereat the plug is provided with an outwardly-directed cylindrical plug surface fitted to bear against the inner surface of the casing sidewall to seal-off the casing sidewall and casing end panel from propellant gas arising upon firing of the ammunition.
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Accused Products
Abstract
A cartridge or ammunition casing is made of two components, one forming the outer casing sleeve and head end and the other comprising a plug seated within the head end to protect the outer casing material from propellant gases. The outer cylindrical sidewall and end panel of the casing may be made of a material selected from the group consisting of stainless steel, steel, pre-coated carbon steel, brass or brass-type alloys, aluminum, hardened aluminum alloys, and suitable polymeric plastic material such as nylon derivatives and VECTRA™. The inner plug may be made of a material selected from the group consisting of aluminum, brass, steel, stainless steel, and suitable polymeric materials.
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Citations
28 Claims
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1. A casing for cartridge ammunition, the casing having a head end and an interior volume for containing propellant comprising:
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a) a generally cylindrical sleeve portion that forms the sidewall of the casing with a casing sidewall inner surface, the casing being further substantially closed at the head end by a casing end panel having a circumferential boundary joined with the sidewall, the casing end panel having a centrally located end panel opening to receive a primer, and b) an inner reinforcing plug seated against the head end to provide support to the casing against the high pressures experienced in the firing of the ammunition, the inner plug having a primer recess formed therein and aligned with said end panel opening to receive a primer, the recess being provided with one or more perforations through the inner plug to permit gas from the primer to enter into the interior of the casing wherein the inner plug extends laterally between the primer well recess and the casing sidewall whereat the plug is provided with an outwardly-directed cylindrical plug surface fitted to bear against the inner surface of the casing sidewall to seal-off the casing sidewall and casing end panel from propellant gas arising upon firing of the ammunition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of manufacturing a casing for cartridge ammunition, the casing having a cylindrical casing sidewall of final diameter and a head end closed by an end panel comprising the steps of:
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1) providing an outer cylindrical tube with a sidewall to form the eventual casing sidewall, the tube being closed at one end to provide the casing end panel and having a diameter which is smaller than the eventual, final, casing sidewall diameter; 2) forming in outwardly extending casing rim at the closed end of the cylindrical tube, the rim having the diameter of the eventual casing sidewall; and 3) expanding a portion the tube sidewall commencing at a point above the end panel sufficient to provide an extractor groove for the casing and a casing sidewall of the final diameter for the casing.
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Specification