US2902933A - Subcaliber training cartridge - Google Patents

Description

Sept. 8, 1959 M. MOLDOFSKY L SUBCALIBER TRAINING CARTRIDGE Filed Aug. 25, 1958 on /1 6742 2/ w III. III- Unite States Patent ill SUBCALIBER TRAINING CARTRIDGE Matthew Moldofsky, Philadelphia, Pa., C Walton Musser, Beverly, Mass, and Albert M. Stott, Aldan, Pa, as= signors to the United States of America as represented by the Secretary of the Army Application August 25, 1958, Serial No. 757,165

2 Claims. (Cl. 102-41) (Granted under Title 35, US. Code (1952), see. 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.

This invention relates to subcaliber training cartridges and has for its principal object the provision of an improved mechanism whereby troops may be trained in the use of major weapons such as recoilless rifles without the expense incident to the use of the ammunition normally used by such weapons.

It is desirable in the use of subcaliber training ammunition in a major weapon that (1) the subcaliber ammunition be such as to require no modification of the major weapon (2) the firing of the subcaliber ammunition produce in the vicinity of the major weapon conditions similar to those produced by the firing of the major ammunition, and (3) the trajectory of the subcaliber projectile match that of the major projectile.

The present invention accomplishes all these results and, in addition provides a minor caliber casing extractor which is actuated by a simple rotary movement of the rear end of the subcaliber mechanism.

The invention will be better understood from the following description when considered in connection with the accompanying drawings and its scope is indicated by the appended claims.

Referring to the drawings:

Fig. 1 is a longitudinal sectional view of the improved subcaliber training cartridge which has outward dimensions similar to those of the cartridge normally fired by the major weapon,

Fig. 2 is a cross-section taken on the line 2-2 of Fig. 1, Fig. 3 is a longitudinal view of the subcaliber barrel, and

Fig. 4 illustrates a detail of the subcaliber barrel.

The subcaliber training cartridge of Figs. 1 and 2 includes a casing which has perforations 11 and encircles a subcaliber rifle barrel 12. Threaded onto the barrel 12 i-s'a barrel adjusting nut 13 which has a plurality of circumferentially arranged apertures. Into one of these apertures is threaded a locking screw 14. Into the remainder of these apertures are threaded special screws 15 which are backed outward from the apertures to fix the casing 10 to the barrel 12. With the screw 14 in its untightened position, the casing 10 and the nut 13 may be rotated for adjusting the casing longitudinally of the barrel.

At its rear end, the barrel adjusting nut 13 engages a bearing 16 to which it is coupled by pins 17 which extend through the rear end of the nut 13 into a circumferential groove 18 of the bearing. This coupling permits rotation of the bearing with respect to the nut which is normally fixed to the barrel and casing.

The bearing 16 has a longitudinal slot 19 in which is located a subcaliber casing extractor 20 biased to its illus- Patented Sept. 8, 1959 2 trated position by a spring 21. The extractor has at its forward end a tang 22 and at its rear end a stop 23 which is adjacent a cam-shaped surface 24.

As shown more clearly in Figs. 3 and 4, the barrel 12 has a thread 25. This thread, extending about threefourths of the way around the barrel, is cut in a raised section 26 of the barrel, and is arranged to receive the tang 22 of the extractor. Under these conditions, rotation of the bearing 16 moves the tang in the groove 25 and forces the extractor to the rear. As the extractor moves to the rear, the cam-shaped surface 24 engages the offset in the barrel and the rearward motion is arrested by the stop 23 engaging this offset. There is thus produced a rearward and slightly outward movement by which the minor caliber casing is extracted. Upon rotation of the bearing in the opposite direction, the extractor is returned to its illustrated position.

At its forward end, the barrel 12 is positioned within a nose 27 by means of a sleeve 28, a ring 29 pressed into the shell body and screws 30 and 31. The screws 30 are utilized to adjust the barrel to a desired position within the casing and the screws 31 function to lock the screws 30 in the position to which they are adjusted.

Intermediate its ends, the barrel 12 has a series of small holes 32 which, taken with the openings 11 of the casing, produce a realistic flash from the rear of the major Weapon. This not only trains the personnel in the handling and firing of the round. It gives them the realistic flash that warns them to stay away from the rear of all recoilless rifles when they are fired.

The holes 32 have the effect of reducing the velocity of the minor caliber projectile and are so proportioned as to match the trajectory of this projectile with that of the major projectile. These holes thus serve the double function of producing a realistic rearward blast and of imparting a desired trajectory to the subcaliber projectile.

We claim:

1. In a subcaliber training cartridge having a perforated casing which has a diameter commensurate with the bore of a major weapon, the combination of a subcaliber barrel extending into said casing and having relatively fine and coarse threads, means for locking said barrel to said casing, a barrel adjusting nut threaded onto said fine thread, a bearing rotatably coupled to said nut and having a longitudinal groove, and an extractor located in said groove and having a tang arranged to engage said coarse thread for moving said extractor in said groove.

2. In a subcaliber training cartridge having a perforated casing which is of a diameter commensurate with the bore of a major weapon and has circumferentially arranged openings near its rear end, the combination of a subcaliber barrel extending into said casing and having relatively fine and coarse threads, a barrel adjusting nut threaded onto said fine thread and having front and rear circumferentially arranged apertures, a plurality of screws each threaded into a different one of said front apertures for locking said casing to said barrel, a bearing having circumferential and longitudinal grooves, a plurality of pins each extending through a diiferent one of said rear apertures into said circumferential groove and an extractor located in said longitudinal groove and having a tang arranged to move in said coarse thread in response to rotation of said bearing.

References Cited in the file of this patent UNITED STATES PATENTS 2,826,145 Sandberg et a1. Mar. 11, 1958

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