K R FW L E R AMMUNITION E'OR RECOILLESS WEAPONS ‘ Filed Dec. 12,. 1946 W. i mw QM. gi ? 2,4929% 79 Patented Dec. 27, 1949 2,492,279 UNITED STATES PATENT OFFECE 2,492,279 AMMUNITION FOR RECOILLESS WEAPONS Kenneth E. Fowler, Warren, Pa. Application December 12, 1946, Serial No. 715,675 1 1 Claim. (Cl. 102-38) My invention relates to improvements in am munition for recoilless weapons, particularly ?xed ‘ammunition ?red electrically in such- weapons. In recoilless weapons of the type to be dis cussed, a proportion of the propellent gases is permitted to escape rearwardly of the weapon . 2 1 action of the breech mechanism, the breechblock 3 closes the chamber 2 preparatory to ?ring of the weapon. ' To eliminate recoil in the weapon, the breech block 3 is provided with a plurality of inclined, tapered ori?ces 6 through which a proportion of to eliminate recoil of the same. Leakage of such the propellent gases are discharged from the car gases not only diminishes the resultant eifect of tridge case. The degree of inclination, the direc these gases but also causes corrosion of the ?n tion and the size of these ori?ces 6 are such that ished surfaces of parts resulting in improper 10 the reaction of the propellent gases passing functioning of the same. through them will counteract the forces actingv The principal object of my invention is to upon the weapon, such as the rotational forces provide an insulating seal between the cartridge created by the reaction between the rifling in the case walls and the electrical conducting means barrel and the moving projectile, and the longi passing through the walls for ?ring the car tudinal forces, caused by the reaction of the pro tridge, said seal also being capable of withstand— jectile when it is ejected from the cartridge case. ing the heat and pressure generated by the pro Further explanation of the operation of the pellent gases. recoilless weapon may be had by reference to my The present invention can be used with recoil application Serial No. 715,674, ?led December less weapons of the character disclosed in my 20 12, 1947, entitled “Recoilless weapons.” application Serial No. 715,674, entitled “Recoil The round of ammunition 5’ consists of the less Weapons,” ?led December 12, 1947, in which is claimed the structure disclosed in this appli cartridge casing 1 rigidly‘secured, as by crimp ing, about the projectile 8 of any desired form and cation but not claimed herein. contains a propelling charge 8' adapted to be My invention will be more fully understood by i) ignited by a primer, not shown, which is ?red reference to the accompanying drawings in electrically in a manner to be described. which: The rear end ID of the cartridge case 1 is closed Figure 1 is a longitudinal vertical section by a frangible cap 9 of cardboard, molded com through the chamber, the breechblock and ad position or other suitable material which, when jacent parts of a recoilless weapon, showing in 30 the round is fired, is blown out by the propellent elevation, a round of ammunition with its end gases and disintegrated, permitting a portion of broken away to show the construction thereof; the propellent gases to escape rearwardly of the Figure 2 is a vertical section through the projectile and through the ori?ces 6 as hereto breechblock at line 2—2 of Figure 1 showing the fore explained. The cap 9 is anchored in place ori?ces at the rear of the weapon through which 35 by the inturned flange [2’ and sealed by wax 9' the propellent gases escape for counteracting the or other suitable substance. ’ recoil of the weapon; Forwardly of the rear end lb of the’ cartridge Figure 3 is an enlarged partial sectional view case ‘I, an annular rim ll extends about and is taken through lines 3-3 of Figure 1; rigidly secured to the cartridge case 1 by brazing Figure 4 is an enlarged partial sectional view 40 or other similar means. The portion of the car showing the spring-pressed plunger in engage tridge case 1, between its rear end Ill and rim ment with the contact ring of the round of am II and indicated by reference numeral I2, is free munition preparatory to ?ring the same. to be expanded radially by the gases escaping to Figure 1 discloses generally a recoilless weapon having a ri?ed barrel I, a chamber 2, a breech 45 the rear, for a purpose to be described. The rim H is provided with an annular groove block 3, a locking sleeve 4 and a spring-pressed l3 containing a. micarta layer 14, or other suit plunger device for electrically ?ring the round of able insulating material. An annular metallic ?xed ammunition. The weapon is single load contact ring I5 is secured in the layer M and ing and has the necessary mechanism, not shown, for aiming it. 50 sunk below the radial surfaces of the ring H, clearly shown in Figure 3. The ring I 5 is adapt A breech mechanism, not shown, rotates the locking sleeve 4 to unlock and move the breech ed to be engaged by a spring-pressed pin l6 of the block 3 away from the chamber 2 whereby a ?red device 5, at all angular positions of the cartridge round of ammunition 5' can be removed from and case 1, the pin l6 being connected to an outside a new one inserted into the chamber. By reverse 55 electrical source. The rim II and a wall of the 2,492,279 I case 1 against the breechblock 3 to seal off any cartridge case ‘I are provided with aligned radial leakage of the propellent gases between the abut ting faces 28 and 29 of the breechblock 3 and the gun chamber 2‘, respectively, and through the de vice 5, thus protecting these parts from damage. openings [1 and I8, respectively. A hollow cylindrical plug l9 extends through these openings and is securely fastened to the inside of the cartridge case by brazing l9’ or other suitable means. The piston 2|, will also be forced by the gases The plug [9 has a cylin against the seat 25' in the recess 20 and be de— drical recess 20 within which a cylindrical piston . formed, thereby preventing leakage of said gases through the joint between the cartridge case and of the recess 20 by a 'micarta lining 2.2 or similar 10 the electrical wiring. Through the use of the expanding portion I2 material. The plug 19 is also provided at one end and the gas-tight seal for the electrical wiring, I with an aperture and at the other end with a v completely and effectively utilize the propellent tapered recess 20'. gases both to propel the projectile and to coun 7 A short insulated electrical lead 23, having one teract recoil of the weapon, losing none of the of its ends bared and packed with lead foil gases prior to extraction of its energy through against the metallic ring l5 to form a good elec undesirable leakage. trical contact therewith passes through the open It will be obvious to those skilled in the art that ing 24 and has its other end bared and imbedded 2|, formed of copper or other suitable deformable material, is inserted and insulated from the walls g various ‘modi?cations may be made in the con in the copper piston 2|. Another insulated elec trical lead '24’ having one of its endsrbared and 20 struction described herein without departing from the spirit and scope of my inventionl V ‘ ‘ imbedded in the copperpiston 2.1, is connected to .a primer, not shown. An insulated lead '25 from I claim: ' the primer is grounded to the cartridge case at 26 to complete the electrical circuit. The copper piston 2| with its insulating lining 212 has a drive .In an electrically ?red round of ?xed ammuni tion having a casing and a rearwardly disposed ‘?t within the recess 20. The space between the walls of the ?ared recess 20' and the electrical .lead 24’ is sealed with wax 2?! or similar plastic substance to exclude moisture from entering the the chamber and breech block of a gun into which the round is loaded, means for conducting current from an insulated conductor on said gun to the interior of said round to ?re same, said 30 means serving also to cbturate explosive gases, said last means comprising an annular conduct cartridge case. r annular ?ange thereon adapted to seat between . During operation of the weapon, the breech block 3 is opened, a round of ammunition hav ing the improvement just described is rammed into the gun chamber 2 and the breechblock 3 is then closed and locked'preparatory to ?ring. The gun chamber 2 does not house the com plete length of the cartridge case 1 but only that . forward portion u-‘p'to and including the annular rim H, leaving the remaining portion-(1,2 rear - ' To ?re the round of ammunition, electric cur rent from any suitable outside source is carried . by the ‘spring-pressed pin 15 to the annular con tact metallic ring 15,, and then through the lead 23, the copper piston 24 and the lead '24’ to the primer, not shown, returning through the grounded lead .25.. ' deformable cylindrical plug ' of relatively soft metal in said passage constructed and arranged to be forced against a portion of said passage by wardly of the rim 1 I to be engaged by the breech block 3. ing ring set into said annular ?ange but insulated therefrom, a passage through ‘said ?ange and casing from said ring "to the interior of :said cas ing, and insulated conducting means in said pas sage leading from said ring to said interior, said conducting means including an enlargedjparti-allly explosive gases to prevent leakage of such ,ggases through said passage the portion of the-passage against which the plug is forced under pressure being a conically tapered reduced shoulder in said passage. REFERENCES oi'rnn ~ Upon ?ring the round of ammunition, the pro pellent gases will shoot the project-?ed torwardly I through the gun barrel in the usual manner and at the same time force out the cap v9 disintegrat ing the same, thereby allow-ing a portion of the > KENNETH R. FOWLER. ' ' The following references arenof record in the ?le of this patent: UNITED STATES PATENTS .Number 520,116 Name ' Date Mason .__...__'.. _____ _ .May 22, 18.94 ori?ces B to counteract the recoil of theweapon -= 1,084,7é5 Lindsay _________ __ Jan. 20., 19.14 as already explained. Simultaneously with this action, the propellent gases will ‘alsoexpand radi ally the cylindrical portion 12 of the cartridge 1,108,717 Davis ._________-__.___ Aug. 25., 1914 1,263,763 Hasting __________ __ Apr. 23., ‘11918 propellent gases to escape rearwardly through the.