CARTRIDGE
First Claim
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1. A blank cartridge comprising:
- a casing, means closing said casing at one end, a primer at said one end, said casing having an annular reverse roll at its opposite end and a reverse direction inner tubular section extending in unitary relation with and rearwardly from said annular reverse roll, said casing forming a star-crimp closure extending across the inner end of said inner tubular section, and spaced from said one end, of said inner tubular section, frangible wadding disposed within said casing, adjacent and rearwardly of said star-crimp closure, and an ignitable main powder charge disposed between the closed one end of said casing and said frangible wadding, said frangible wadding being essentially the only effective longitudinal motion restrainer between said star-crimp closure and said main powder charge, said frangible wadding and said reverse roll end and inner tubular section and star-crimp closure being of a combined longitudinal restraining strength to effect retention of said main powder charge up to a pressure within said casing for said main powder charge to effect substantially full ignition and burning thereof, said star-crimp being severable upon full burning pressure by said main powder charge and said inner tubular section and reverse roll being unrollable to straight tubular form under such full burning pressure, said frangible wadding being essentially disintegrable to minute particle size upon firing of said main charge and expulsion thereof into the atmosphere by the firing of said charge.
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Abstract
A blank or propellant gas cartridge having 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 propellent powder charge, with a readily rupturable low tensile strength discrete particulate mass adhesively self-bonded in a total initial restraining mass form between the propellent powder charge and the in-folded telescoping star-crimp closed end of the casing.
25 Citations
8 Claims
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1. A blank cartridge comprising:
- a casing, means closing said casing at one end, a primer at said one end, said casing having an annular reverse roll at its opposite end and a reverse direction inner tubular section extending in unitary relation with and rearwardly from said annular reverse roll, said casing forming a star-crimp closure extending across the inner end of said inner tubular section, and spaced from said one end, of said inner tubular section, frangible wadding disposed within said casing, adjacent and rearwardly of said star-crimp closure, and an ignitable main powder charge disposed between the closed one end of said casing and said frangible wadding, said frangible wadding being essentially the only effective longitudinal motion restrainer between said star-crimp closure and said main powder charge, said frangible wadding and said reverse roll end and inner tubular section and star-crimp closure being of a combined longitudinal restraining strength to effect retention of said main powder charge up to a pressure within said casing for said main powder charge to effect substantially full ignition and burning thereof, said star-crimp being severable upon full burning pressure by said main powder charge and said inner tubular section and reverse roll being unrollable to straight tubular form under such full burning pressure, said frangible wadding being essentially disintegrable to minute particle size upon firing of said main charge and expulsion thereof into the atmosphere by the firing of said charge.
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2. A cartridge according to claim 1, said frangible wadding being formed of discrete particles of cork bonded together in a generally cylindrical mass by an adhesive.
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3. A cartridge according to claim 1, said star-crimp closure being sealed with waterproof material at the central zone thereof.
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4. A cartridge according to claim 1, said tubular casing being formed of thermoplastic material and said base being formed of metal.
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5. A cartridge according to claim 1, said casing having an ignition charge disposed in a bore in said casing and between said primer and said main powder charge, which ignition charge is more easily ignitable than said main powder charge and aids in the full ignition and burning of said main powder charge.
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6. A cartridge according to claim 5, said ignition charge comprising black powder and being much smaller in quantity than said main powder charge.
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7. A cartridge according to claim 6, said main powder charge consisting essentially of smokeless powder.
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8. A cartridge according to claim 1, said main powder charge consisting essentially of smokeless powder.
Specification