US2938458A

US2938458A - Obturating cartridge

Info

Publication number: US2938458A
Application number: US566052A
Authority: US
Inventors: John F O'brien
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-02-16
Filing date: 1956-02-16
Publication date: 1960-05-31
Anticipated expiration: 1977-05-31

Description

May 31, 1960 J. F. OBRIEN 2,933,458

OBTURATING CARTRIDGE Filed Feb. 16, 1956 s Sheets-Sheet 1 INIVENTOIIQ. Jcfhn F. [I ETIEH WZQLQAZIQW H770 R Wsrs,

May 31, 1960 J. F. O'BRIEN 2,938,458

OBTURATING CARTRIDGE 3 Sheets-Sheet 2 Filed Feb. 16. 1956 INVENTOR. v Jul-1n EL O'Brien BY 4f. 5% Q aw. fix.

May 31, 1960 J. F. O'BRIEN I 2,938,458

- .YOBTURATING CARTRIDGE Filed Feb. 16, 1956 s Sheets-Sheet s IN VEN TOR.

John E. U'E'JriEn M 5 M Q flTrOR NEYS.

' John F. OBrien, Springfield, Mass., assignor to the United States of America as represented by the Secretary of the Army Filed Feb. 16, 1956, Ser. No. 566,052

1 Claim. (Cl. 102-38) (Granted under Title 35, US. Code (1952), sec. 266) The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment ,of any royalty thereon.

My invention relates to a cartridge for a gun and more particularly to a cartridge having a neck disposed for elongation to form a gas seal with the barrel of the gun.

Guns, such as the revolver-type automatic gun, include a barrel and a drum with cartridge discharge chambers rotatable with respect to the barrel. Discharge gases escape through the necessary clearance space between the barrel and the drum to heat the drum, and the rate of operation of the gun is limited by the overheating of the drum which causes premature ignition of the cartridges therein.

Obturating sleeves slidable in the chambers have proven to be among the most successful means to decrease the leakage of discharge gases through the clearance space, but eventually the sleeves themselves become heated and transfer heat to the drum.

It is an object of my invention to provide disposable obturating devices for such a gun.

Another object of my invention is to provide such a gun with obturating cartridges.

A further object of my invention is to provide cartridges having cases extensible for'obturation.

A still further object of my invention is to provide cartridges disposed for obturation to bridge the clearance space between the drum and barrel responsive to the discharge of the cartridges.

An additional object of my invention is to provide cartridges with cases having sleeves therein for obturafion. 4

Other aims and objects of my invention will appear from the following explanation.

In carrying out my invention several modifications of obturating cartridges are provided in which the cases of the cartridges are extendable for contact with the breech end of the barrel to bridge the space between the barrel and the chamber-carrying member.

In one of the modifications the necks of the gases are provided with peripheral corrugations which are disposed for deformation by the projectiles to extend the necks into engagement with the barrels, upon discharge of the cartridges, to bridge the clearance spaces between the barrels and the drums.

In another embodiment of my invention the forward ends of the necks of the cartridges are beveled inwardly for extension into engagement with the barrels by the projectiles during the discharge thereof from the cartridges.

In another embodiment of my invention the necks of cartridges are provided with telescopic portions which are extendable into engagement with the barrels during discharge of the cartridges.

In yet another embodiment of my invention sleeves within the necks of cartridges are forwardly slidable responsive to the discharge of the cartridges for engagement with the barrels.

For a more complete understanding reference is made 2,938,458 Patented May .31, 1960 to the accompanying drawings of several forms of my invention in which:

Fig. 1 is a cutaway elevation of one embodiment of my invention inclosed in a cartridge chamber of a gun disposed in the discharge station thereof;

Fig. 2 is a view showing the embodiment illustrated in Fig. 1 after the discharge;

Fig. 3 is a cutaway elevation of a second embodiment of my invention disposed in a discharge station chamber of a gun; A

Fig. 4 is a view showing the embodiment illustrated in Fig. 3 after the discharge;

Fig. 5 is a cutaway elevation of a third embodiment of my invention disposed in a discharge station chamber of a gun;

Fig. 6 is a view showing the embodiment illustrated in Fig. 5 after the discharge;

Fig.7 is an exploded perspective view of the cartridge shown in Fig. 5;

Fig. 8 is a cutaway elevation of a fourth embodiment of my invention disposed in a discharge station chamber of a gun; and

Fig. 9 is a view showing the embodiment illustrated in Fig. 8 after the discharge.

Shown in Fig. 1 is a cartridge 12 which is provided with a case 14 having a neck 15 which case is axially coextensive to a chamber 16 of a gun 18 having a barrel 20. Barrel 20 and chamber 16 are in axial alignment in the battery station thereof with a clearance space 22 therebetween. Neck 15 includes annular corrugations 24 which are longitudinally spaced therealong in the front portions of such neck for engagement by a projectile 17 inclosed within such neck. The corrugations 24 are formed to reduce the length of neck 15 an amount equal to the width of space 22 so that, when projectile 17 is propelled forwardly in the neck responsive to the discharge of cartridge 12, the corrugations are engageably deformed beyond the elastic limits thereof to lengthen the neck sufiiciently to bridge space 22, as shown in Fig. 2, and provide substantially gas-tight connection between the inside of case 14 and the bore of barrel 20.

In the embodiment of Fig. 3, a cartridge 26 axially coextensive to the chamber 16 is provided with a case 28, a neck 29 and a forward portion 30 of the neck inwardly beveled as shown in such figure. veloped lengthof neck 28 includes the width of space 22 and such neck is extendable to bridge the space 22 during discharge of cartridge 26 when portion 30 is pressed into alignment with the remaining portion of neck 28 by the engagement of the discharged cartridge projectile as shown in Fig. 4.

The embodiment of Fig. 5 shows a cartridge 42 with a case 44 axially coextensive to chamber 16 and having a neck with a stub portion 46 corresponding to the neck of a conventional cartridge for gripping the rear end of projectile 17. The remaining portion of the neck comprises a ferrule 48 beveled at the rear end to conform to the angle of a shoulder 50 extending forwardly from case 44 to stub portion 46. Ferrule 48 includes tabs 52 pressed inwardly to lightly grip stub portion 46 and retain ferrule 48 thereon for storage of the cartridges and to maintain the ferrule within chamber 16 during rotation of chamber 16.

A shoulder 54 is provided in ferrule 48 for impingement thereupon of gases to drive ferrule 48 to a forward position and bridge clearance space 22 responsive to discharge of cartridge 42, and a shoulder 56 is provided on stub portion 46 for engagement with tabs 52 in the forward position of ferrule 48 for removal thereof from chamber 16 responsive to extraction of case 44 therefrom.

In the embodiment in Fig. 8 a cartridge 58 includes a The minimum dea 3 7 case 60 axially coextensive to chamber 16 which case is provided with an elongated neck 62 including an inner sleeve 64 of a resilient nonf-metallic material, such as nylon, and a liner 66 disposed. thereinfo inclosing projectile -17l Liner 66 includes an inner-jflange68' which extends radially outward to engage thevrear endof sleeve 64' v I V V r Gases impinge on flange 68 to propel liner 66' and sleeve 64 forwardly to bridge clearance space 22, responsive to discharge of cartridge 58.

Although several embodiments 'oithe invention have been described in detail herein, it is evident that many variations may be devised within the spirit and scope thereof and the following claim intended toinclude such variations.

I claim: ,7 Y

A cartridge for a gun including a barrel and. a chamber for receiving the cartridge, the chamber beingv disposed for axial alignment with the barrel and for separation therefrom the width of a clearance space, the cartridge comprising a projectile, a case having. contact with the Walls of the chamber when received. thereby, said case being provided with a forwardly extending neck for fully inclosing said projectile and having the same inside diameter as the maximum diameter portion of said pro- 3 jectile for gripping retention thereof, annular corrugations formed in said neck for swaging deformation between said projectile and the walls of the chamber through radial forces applied by said projectile when propelled along said neck responsive to the discharge of the cartridge, said corrugations being provided with predetermined excess material sufficient to bridge the space between the barrel and chamber when said corrugations are deformed by said projectile, and said corrugations being,

disposed in spaced relationship along said neck and between the front end thereof and the maximum diameter portion of said projectile for deformation thereby to bridge the space before said projectile passes thereby.

References Cited in the file of this patent "UNITED STATES PATENTS Great Britain of 19 14