Muzzle-guard for firearms

#1. Steam and Gas Turbines . . . by Dr. A. Stodola, N.Y. 1945.

#2. Textbook of Small Arms . . . The War Office, London 1929.

#3. Engineering Formulas . . . Kurt Gieck, Second Edition, M-c Graw-Hill Book Company, Second American Edition 1976.

#FIG. 1 is a coaxial section of the muzzle-guard mounted on the end of a barrel of a firearm.

#FIG. 2 is a plan of nozzles on the bucket-wheel.

#FIG. 3 shows a cross-section of a barrel of a firearm with the muzzle-guard mounted at the end.

#FIG. 1 is a coaxial section of the muzzle-guard. At discharge bullet 12 moves through the barrel 1, having twist 2 to edge 5 at openings 3. When the edge 20 of bullet 12 nears edges 19 of openings 3, the compressed air in front of the bullet 12 is forced by this bullet into these openings 3. When the edge 13 of bullet 12 passes edges 19, the powder-gasses are forced through openings 3 into chamber 6 and then into the nozzles 10 on the bucket-wheel 11 in the housing 18. Housing 18 is fastened to the barrel 1 by thread 4, has key 24 which insures wheel 11 against revolving. Wheel 11 is fastened with the help of stub 7 and thread 8 as well as nut 14 and thread 9. Powder gasses flow from the buckets 10 with the small coaxial velocity v.sub.o1 --FIG. 2--to the stub 7. At the same time the edge 13 of the bullet 12 passes the edges 16 in the openings 15 of the nut 14, and the part of the gasses flowing behind bullet 12 moves in these openings 15, is diffused, changes direction and in stub 7 mixes with the gasses flowing from buckets 10. Together they leaves the stub 7 in small coaxial velocity in the form of a widening cone. The distances between the edges 19-5, and 16-17 should be smaller than the distance between the edges 13-20 of the bullet 12.

#FIG. 2 is a plan of the nozzles of the bucket-wheel 11 and nut 14, suitably arranged at proper angle .alpha..sub.1 and .alpha..sub.2 so that, gas streams leaving them would be at opposites to each other, and thus minimize the momentum which turns barrel 1--FIG. 1. The stream of gasses flowing from chamber 6 leaves buckets 10 with the velocity v.sub.1, small coaxial velocity v.sub.o1, and rotates around the axle of the barrel 1 with velocity v.sub.r1. The stream of gasses leaving the nozzles 15 with velocity v.sub.2, has the coaxial velocity v.sub.o2 and rotates with speed v.sub.r2 in opposite direction. When both streams mix, they leave the stub 7 in the form of a widening cone with small coaxial velocity depending on the angles .alpha..sub.1 and .alpha..sub.2.

#The path of the main gas stream: across opening 3--FIG. 1--, chamber 6, nozzles 1o and stub 7, as well as the path of the stream created across nozzles 15 are notable longer than the path of bullet 12 from edges 19 to the edge 50. In addition, gasses flow out in the form of cone around the axis of the barrel 1--FIG. 1--. Because of this, the gasses cannot effect the movement of bullet 12 when its velocity is not too small.