US3745923A - Training cartridge - Google Patents

Training cartridge Download PDF

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Publication number
US3745923A
US3745923A US3745923DA US3745923A US 3745923 A US3745923 A US 3745923A US 3745923D A US3745923D A US 3745923DA US 3745923 A US3745923 A US 3745923A
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Prior art keywords
cartridge
charge
projectile
case
cavity
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A Grandy
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US Department of Army
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US Department of Army
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B8/00Practice or training ammunition
    • F42B8/02Cartridges

Abstract

A non-lethal cartridge comprising a primary charge, a secondary charge and a projectile which consists of a B-B ball shot encased in a plastic carrier. A shielded detonating cord extends axially between the cartridge''s primer and the primary charge which is located in the base of the carrier. When the primer is initiated, the primary charge is ignited through the cord to drive the carrier and the B-B through the muzzle of a firearm. Vents in the carrier initiates the ignition of the secondary charge to generate sufficient gas pressure to cycle the firearm.

Description

Unite States Patent 1 Grandy TRAINING CARTRIDGE [75] Inventor: Andrew J. Grandy, North Hills, Pa.
[73] Assignee: The United Stats of America as represented by the Secretary of the Army, Washington, D.C.
22 Filed: -Nov.16,1971
211 Appl. No.: 199,201
{52] US. Cl. 102/41, 102/92.7 [51] Int. Cl. F42b 5/22, F42b 13/20 [58] Field of Search 102/41, 92.7
[56] References Cited UNITED STATES PATENTS 10/1888 Hurst 102/41 2/1969 Snyder et al 102/92.7
FOREIGN PATENTS OR APPLICATIONS Great Britain l02/92.7
[451 July 17, 1973 .Primary Examiner-Benjamin A. Borchelt Assistant Examiner-C. T. Jordan A ttorneyflarry M. Saragovitz, Edward Kelly and Herbert Berl [57] ABSTRACT A non-lethal cartridge comprising a primary charge, a secondary charge and a projectile which consists of a 8-8 ball shot encased in a plastic carrier. A shielded detonating cord extends axially between the cartridge s primer and the primary charge which is located in the base of the carrier. When the primer is initiated, the
primary charge is ignited through the cord to drive the carrier and the B-B through the muzzle of a firearm. Vents in the carrier initiates the ignition of the secondary charge to generate sufficient gas pressure to cycle the firearm.
4 Claims, 1 Drawing Figure PATENIED JUL T 3. 745 923 INVENTOR) fine/read J Gran a'y :15 mi BY mziwm ATTORNEYS TRAINING CARTRIDGE The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.
This invention relates to a training cartridge and more particularly to a non-lethal cartridge for rifle firing in target practice.
Training cartridges should be non-lethal at a range of 200 feet and sufficiently accurate to hit a man-size silhouette target at 200 feet. It should be capable of imparting sufficient energy to actuate an electronic type target also at 200 feet. Further, it must be capable of firing in single, semi-automatic and automatic modes. Training cartridges presently used do not meet these requirements.
The present invention provides a cartridge to meet all the above requirements, and is capable of generating sufficient gas pressure to cycle the firearm as necessary. Briefly the invention is basically a double impulse type cartridge that contains two separate and distinct charges. The primer and cartridge case are standard components. The secondary charge will generate the gas pressure required for firearm cycling, such as in a rifle. The projectile consists of a steel B-B ball shot encased in a plastic carrier crimped to the cartridge case mouth. The carrier contains a primary propellant charge in a cavity in its base. A length of low energy detonating cord extends from the primer to the cavity in the carrier which is vented to permit flash-back of the primary charge into the secondary charge. In operation the primer ignites the cord which ignites the primary charge and propells the carrier and the 8-8 down the barrel of the firearm. Flash-back of the primary charge ignites the secondary charge which generates enough pressure to operate the firearms cycling, after the projectile has been propelled from the firearms muzzle. The carrier acts as an obturator. The secondary charge will evacuate all barrel residue as well as recycling of the firearm. I
It is a primary object of this invention to provide a training cartridge containing two separate and distinct charges, one for propelling the projectile therefrom and one for generating sufficient gas pressure to cycle the firearm.
Another object is to provide a cartridge projectile consisting of a steel B-B encased in a plastic carrier.
A further object is to prvide means to first ignite a propellant charge in the carrier, then the secondary charge after the projectile has been propelled from the muzzle of the fireann.
A still further object is to provide a non-lethal training cartridge efi'ective at a range of 200 feet.
These and other objects and advantages will become apparent from the following description when taken in connection with the annexed drawing.
The single FIGURE in the drawing illustrates an axial section taken through the cartridge of this invention.
Referring now in detail to the drawing wherein reference character 1 indicates generally the cartridge of this invention. Cartridge 1 includes a case 2 and a primer 3 of the percussion type, common to most firearm cartridges. Cartridge is provided with a projectile indicated generally by 4. Projectile 4 comprises a steel B-B ball 5 which is encased in a carrier 6 made of a plastic material. Carrier 6 is crimped to the mouth of case 2 as at 7 and is provided with a cavity 8 disposed centrally in its base and contains a primary charge 9. Cavity 8 is flared as at 10 for a purpose to be later described. A detonating cord 11 extends axially between primer 3 and charge 9 and is shielded by a tube 12 as shown. A secondary charge 13 fills: the remaining space in the case 2. A baffle 14 at the rearward end of car tridge case 2 completes the assembly of the cartridge.
In operation, when primer 3 is struck by the firing pin of a firearm, detonating cord 11 is ignited which in turn, ignites primary charge 9 to drive carrier 6 and 8-3 5 down the barrel of the fireann, not shown. The carrier acts to obturate the barrel during its travel therethrough while ignition of charge 9 effects a backward flash due to the flared portion of cavity 8 and ignites secondary charge 13. This secondary charge will generate sufficient gas pressure during the obturating phase of the projectile s travel to operate cycling of the firearm for the next round. Immediately thereafter it will act to scavenge the barrel of any burnt residue as the carrier and 8-8 are projected from the gun.
While a preferred form of the invention has been shown and described, other forms of the invention are contemplated and numerous changes and modifications may be made therein without departing from the spirit of the invention as set forth in the appended claims.
What is claimed is:
l. A double impulse training cartridge for use in a conventional firearm comprising a cartridge case, a primer in the base of the case, a projectile secured in the forward end of the cartridge case, said projectile having a rearwardly facing axial cavity, a primary propellant charge disposed in the rearwardly facing cavity, a detonating tube extending from the primer axially through the cartridge case and into the projectile cavity, and a secondary scavenging and firearm recycling charge disposed in the cartridge case exteriorly of the detonating tube, the outer diameter of the forward end of the detonating tube being substantially less than the inner diameter of the surrounding projectile cavity so that a vent conduit is provided between the projectile cavity and the interior of the cartridge case exteriorly of the detonating tube for the passage of a flashback from the primary charge to ignite the secondary charge after ignition of the primary charge by the detonating tube and primer.
2. The cartridge of claim 1 in which the projectile comprises a carrier of lightweight material, and a B-B ball shot encased in the forward end of the carrier.
3. The cartridge of claim 1 in which the detonating tube comprises a detonating cord, and a shielding tube encasing the cord.
4. In combination with a cartridge including a case, a primer in the base of the case, a projectile secured in the forward end of the case and having a rearwardly facing cavity, a double impulse explosive train in said cartridge comprising a propellant charge disposed in said projectile cavity, a scavenging charge in the case, and a shielded detonating tube extending from the primer through the case and into said projectile cavity, the outer diameter of the forward end of the shielded detonating tube being substantially less than the inner diameter of the surrounding projectile cavity so that a vent conduit is provided between the projectile cavity and the interior of the cartridge case exteriorly of the detonating tube for the passage of a flashback from the primary charge to ignite the secondary charge immediately after ignition of the primary charge by the detonating tube and primer.
I i i 1

Claims (4)

1. A double impulse training cartridge for use in a conventional firearm comprising a cartridge case, a primer in the base of the case, a projectile secured in the forward end of the cartridge case, said projectile having a rearwardly facing axial cavity, a primary propellant charge disposed in the rearwardly facing cavity, a detonating tube extending from the primer axially through the cartridge case and into the projectile cavity, and a secondary scavenging and firearm recycling charge disposed in the cartridge case exteriorly of the detonating tube, the outer diameter of the forward end of the detonating tube being substantially less than the inner diameter of the surrounding projectile cavity so that a vent conduit is provided between the projectile cavity and the interior of the cartridge case exteriorly of the detonating tube for the passage of a flashback from the primary charge to ignite the secondary charge after ignition of the primary charge by the detonating tube and primer.
2. The cartridge of claim 1 in which the projectile comprises a carrier of lightweight material, and a B-B ball shot encased in the forward end of the carrier.
3. The cartridge of claim 1 in which the detonating tube comprises a detonating cord, and a shielding tube encasing the cord.
4. In combination with a cartridge including a case, a primer in the base of the case, a projectile secured in the forward end of the case and having a rearwardly facing cavity, a double impulse explosive train in said cartridge comprising a propellant charge disposed in said projectile cavity, a scavenging charge in the case, and a shielded detonating tube extending from the primer through the case and into said projectile cavity, the outer diameter of the forward end of the shielded detonating tube being substantially less than the inner diameter of the surrounding projectile cavity so that a vent conduit is provided between the projectile cavity and the interior of the cartridge case exteriorly of the detonating tube for the passage of a flashback from the primary chArge to ignite the secondary charge immediately after ignition of the primary charge by the detonating tube and primer.
US3745923D 1971-11-16 1971-11-16 Training cartridge Expired - Lifetime US3745923A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US391367A (en) * 1888-10-16 Haeeis p
US3429263A (en) * 1967-04-17 1969-02-25 James B Snyder Marking projectile and method of use
GB1157555A (en) * 1966-09-29 1969-07-09 Rheinmetall Gmbh Improvements in or relating to Target Practice Rounds.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US391367A (en) * 1888-10-16 Haeeis p
GB1157555A (en) * 1966-09-29 1969-07-09 Rheinmetall Gmbh Improvements in or relating to Target Practice Rounds.
US3429263A (en) * 1967-04-17 1969-02-25 James B Snyder Marking projectile and method of use

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