Back to results
US 4,162,645 AGranted
Method of making a cartridge
AssigneeAAI Corporation
InventorDavid D. Abbott
Life of this patent
Estimating the term…
Abstract
A method of making a cartridge, in particular a blank or propellant gas cartridge which has a casing of generally tubular form with a telescopically reverse in-folded star-crimp-closed integral tubular end section, and within which is contained a blank propellant powder charge, with a readily rupturable wad of low heat conductivity initial restraining mass formed between the propellant powder charge and the in-folded telescoping star-crimp-closed end of the casing, in which method the cartridge is formed by front loading a propellant charge and the low-heat-conductivity wad, and then star-crimping and telescopically reverse in-rolling the cartridge casing, after which the recessed in-rolled star-crimped casing is heat sealed.
Claims14
The method of making a cartridge, comprising
- holding a dual bore tubular shell casing having two interconnecting bores of respectively a small diameter for an ignition charge and a large diameter for a propellant charge, said casing having a closed base end with a primer therein in effective primer ignition communication with said small diameter bore, and an open mouth forward end,
- flowing a measured loose granular primer-ignitable ignition charge in laterally guided relation through and past said open mouth and directly into said small diameter bore,
- flowing a measured loose granular propellant charge through said mouth while holding said casing against intermixing movement,
- inserting a close-fitting disc wad into said casing to a distance spaced longitudinally inwardly from said open mouth end and longitudinally outwardly from the settled surface of said propellant charge,
- star crimping said open mouth end of said casing to a position across said disc wad, reverse-roll-forming the star-crimped said open end by exerting peripheral axial rolling force on the annular periphery of the star-crimped end of said casing to thereby reverse-roll-form the star-crimped end of said casing and thereby correspondingly axially moving said disc wad downwardly into containing and geometrically stabilizing seated relation with said propellant charge, and thereupon sealing the resulting recessed star-crimped end of said casing.
2 more elements
The method of making a cartridge, comprising
- holding a tubular shell casing, having a closed base end and an open mouth forward end,
- inserting a propellant charge through said mouth,
- inserting a close-fitting disc wad into said casing to a distance adjacent and spaced longitudinally inwardly from said open mouth end and spaced longitudinally outwardly from the ultimate effective settled and desired contained condition surface of said propellant charge,
- star-crimping said open mouth end of said casing to a position across said disc wad, reverse-roll-forming the star-crimped said open end by exerting peripheral axial rolling force on the annular periphery of the star-crimped end of said casing to thereby reverse-roll-form the star-crimped end of said casing and to correspondingly axially move said disc wad downwardly into containing and geometrically stabilizing seated relation with said propellant charge, and thereupon sealing the resulting recessed star-crimped end of said casing.
1 more element
The method of making a cartridge, comprising
- holding a dual bore tubular shell casing having two interconnecting bores of respectively a small diameter for an ignition charge and a larger diameter for a propellant charge, and having a closed base end and an open mouth forward end.
- flowing a measured loose granular ignition charge in laterally guided relation through and past said open mouth and directly into said small diameter bore,
- flowing a measured loose granular propellant charge different from said ignition charge through said mouth while holding said casing against intermixing movement,
- inserting a close-fitting disc wad into said casing to a distance spaced longitudinally inwardly from said open mouth end and longitudinally outwardly from the ultimate effective settled and desired contained condition surface of said propellant charge,
- star-crimping said open mouth end of said casing to a position across said disc wad, reverse-roll-forming the star-crimped said open end by exerting peripheral axial rolling force on the annular periphery of the star-crimped end of said casing to thereby reverse-roll-form the star-crimped end of said casing and to correspondingly axially move said disc wad downwardly into containing and geometrically stabilizing seated relation with said propellant charge, and thereupon sealing the resulting recessed star-crimped end of said casing.
2 more elements
The method of making a cartridge, comprising
- holding a tubular shell casing, a closed base end and an open mouth forward end,
- inserting a measured granular ignition charge into said casing through said open mouth,
- inserting a measured loose granular propellant charge through said mouth,
- inserting a close-fitting disc wad into said casing to a distance spaced longitudinally inwardly from said open mouth and longitudinally outwardly from the settled surface of said propellant charge,
- star crimping said open mouth end of said casing to a position across said disc wad, reverse-roll-forming the star-crimped said open end by exerting peripheral axial rolling force on the annular periphery of the star-crimped end of said casing to thereby reverse-roll-form the star-crimped end of said casing and thereby correspondingly axially moving said disc wad downwardly into containing and geometrically stabilizing seated relation with said propellant charge, and thereupon sealing the resulting recessed star-crimped end of said casing.
2 more elements
Dependencies are inferred from the claim text.