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Sssssssssssssn1 US 20040079221A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2004/0079221A1 Woods et al. (43) Pub. Date: Apr. 29, 2004 (54) ATTACHMENT FOR RECOIL, NOISE, Publication Classification BLAST AND FLASH SUPPRESSION OF THERMODYNAMICJETTING DEVICES SUCH AS FIREARMS, HIGH PRESSURE (51) Int. Cl. ................................................. F41A 21/00 EXHAUST MECHANISMS AND OTHER HEAT ENGINE DEVICES, WHICH PRODUCE (52) U.S. Cl. ............................................................... 89/14.4 SUCHJETTING EXHAUST ACTIONASA RESULT OF THEIR FUNCTION (76) Inventors: Robert James Woods, Phoenix, AZ (57) ABSTRACT (US); Jean Marie Evangeline Serrano, Danville, CA (US) Correspondence Address: Our invention describes a muzzle or exit exhaust attachment Robert James Woods for firearms or other thermodynamic heat engine jetting 3043 E. Clarendon Avenue devices and incorporates magnetic field diversion design Phoenix, AZ 85016-7014 (US) features not previously utilized to increase efficiency in the reduction of noise, flash, barrel whip, exhaust flame tem (21) Appl. No.: 10/413,685 perature and muzzle blast effect. Our invention advanta geously applies relatively recent discoveries in the field of (22) Filed: Apr. 15, 2003 ballistic Studies, know as transition ballistics, and mitigates Related U.S. Application Data the high Velocity, high preSSure exhaust gasses from the instant of existence through decline to atmospheric preSSure (60) Provisional application No. 60/420,447, filed on Oct. with greater efficiency than prior art devices Such as, Silenc 24, 2002. ers, SuppreSSors, mufflers and Sound absorber attachments. 6- m N (f ZZZYZZZZZNNNNNNNN 73. %. M SNENNENNIN NANNANENNANENSSENANNSSSSSSSSSSSSSN1. T NNNNNN NNNNNNNNNILLC N NNNN1ANNNSNESSENANA VSENNANEESSENNAzzan 1SN2NE1 NANha-Nhia N Patent Application Publication Apr. 29, 2004 Sheet 1 of 3 US 2004/0079221A1 FIG. 1 FIG 2 US 2004/0079221A1 Apr. 29, 2004 ATTACHMENT FOR RECOIL., NOISE, BLAST AND 0007. The object of the coaxial assembly of rare earth FLASH SUPPRESSION OF THERMODYNAMIC magnetic toroids is to utilize the force known as Lorenz JETTING DEVICES SUCH AS FIREARMS, HIGH effect that directs a force perpendicular to the high Velocity PRESSURE EXHAUST MECHANISMS AND gaseous particle flow, thereby redirecting, helically confin OTHER HEAT ENGINE DEVICES, WHICH ing and delaying, cooling and extracting energy from the PRODUCE SUCHJETTING EXHAUST ACTIONAS gaseous exhaust column. This action provides Superior effi A RESULT OF THEIR FUNCTION ciency in recoil reduction, flash and blast Suppression than So far attained in prior art Suppression devices. CROSS REFERENCE TO RELATED APPLICATIONS 0008 Information in Support of the concept, design and development of this invention has been obtained by refer 0001. Not applicable ence to prior art patents, publications from national labora tories, Symposium proceedings, the publications of the Vari STATEMENT REGARDING FEDERALLY ouS armed forces of the United States, college and university SPONSORED RESEARCH OR DEVELOPMENT published research and research by manufacturers promi 0002) Not applicable nent in the field of ballistic Science. 0009 Publications Referenced REFERENCE TO SEQUENCE LISTING, A TABLE OR A COMPUTER PROGRAM LISTING 0010 Weapon Systems Fundamentals, NAVWEPSOP COMPACT DISKAPPENDIX 3000, volume 2, published by U.S. Navy Bureau of Naval Weapons. 0003) Not applicable 0011. The Machine Gun, Volumes 1 through 5, by BACKGROUND OF THE INVENTION George Chinn, U.S. Marine Corp., for the U.S. Navy Bureau of Ordnance. 0004. This invention describes a muzzle or exit exhaust attachment for firearms or other thermodynamic jetting (002) Counter Sniper Technology, Proceedings of the devices and incorporates design features not previously 5 Battlefield Acoustics Symposium, Ft. Mead, Md., utilized to increase efficiency in the reduction of noise, flash, September 1997 barrel whip, exhaust flame temperature and muzzle blast 0013 General Atomics Corp., Plasma Physics Group, effect. This invention takes advantage of relatively recent San Diego, Calif., 2001, Magnetic Confinement of discoveries in the field of ballistic Studies, known as tran Charged Particles sition ballistics, which utilize the high velocity motion of high pressure gasses from the very earliest moment of 0014 Schrodinger's Machines, Gerard J. Milburn, existence through the final instant of pressure decline to published by W. H. Freeman Company, New York, N.Y. atmospheric pressure in an improved design that provides ISBN 071673 1061 greater efficiency of function than prior art devices Such as, 0.015 University and Laboratory Published Research Silencers, Suppressors, mufflers and Sound absorber attach mentS. 0016 Lawrence Laboratory, University of CA, Berke 0005. This invention is comprised of three coaxial tubular ley, Calif. chambers assembled as a primary chaotic divergent expan 0017 Center For Innovative Sintered Products, P/M Sion chamber, a Secondary convergent compression chamber Laboratory, Penn State University, PA and a magnetic diversion chamber. The first two chambers provide a preconditioning effect, by firstly enhancing expan 0018 Ames National Laboratory, Rare Earth Informa Sion and cooling of the high Velocity gas exhaust column tion Center that increases the gas Velocity and reduces its pressure and 0019 NIST, Boulder Magnetic Research Group, Boul Secondly, by further directing the exhaust gas column into der, Colo. the Secondary convergent compression chamber in which the gas column is compressed thereby reducing its exit 0020 National High Magnetic Field Laboratory, nozzle velocity as either less than or equal to, but never Florida State University, Tallahassee, Fla. greater than the Velocity of Sound regardless of the magni 0021 US Patent Office, Prior Art Patents Searched tude of the pressure within the Secondary compression chamber. 0022 U.S. Pat. No. 1,482,805, Maxim, Feb. 5, 1924 0006 The preconditioned high pressure gas column now 0023 U.S. Pat. No. 1525,846, Wurtzebach, Feb. 10, exits the compression chamber nozzle and is immediately 1925 acted upon by the third and final Stage of this invention, the 0024 U.S. Pat. No. 1,636,357, Cutts, Jul 19, 1927 magnetic diversion chamber. This chamber comprises a metallic tube which houses, retains and provides coaxial 0025 U.S. Pat. No. 2,101,063, Green, Dec. 7, 1937 alignment for an assembly of high magnetic intensity rare 0026 U.S. Pat. No. 2,101,848, Green, Dec. 14, 1937 earth magnetic toroids that, in turn are separated, retained and compressed by wave washers between each magnetic 0027 U.S. Pat. No. 2,101,848, Green, Dec. 14, 1937 toroid thereby providing an aligned assembly retained in 0028 U.S. Pat. No. 2,128,936, Green, Sep. 6, 1938 position by the threaded retaining ring baffle plate which provides a rigid final exit passage of a projectile or gaseous 0029 U.S. Pat. No. 2,150,161, Green, Mar. 14, 1939 column. 0030 U.S. Pat. No. 2,184,595, Green, Dec. 26, 1939 US 2004/0079221A1 Apr. 29, 2004 0031 U.S. Pat. No. 2,339,777, Green, Jan. 25, 1944 manner in which the magnetic toroids and wave washers are 0032 U.S. Pat. No. 2,351,037, Green, Jun. 13, 1944 aligned around the central exhaust bore. 0052 FIG. 7 displays a sectionalized view of the mag 0033 U.S. Pat. No. 2,375,617, Bourne, May 8, 1945 netic diversion chamber and concept of the Stacking, align assign/Maxim Silencer Corp. ing and retaining of the magnetic toroids Separated and 0034 U.S. Pat. No. 2,404,632, Ivanovic, Jun. 25, 1946 cushioned by the wave washers to be compressed by the threaded muzzle flange at final assembly. 0035 U.S. Pat. No. 2,625,235, Caulkins, Jan. 13, 1953 0.036 U.S. Pat. No. 3,152,510, Ashbrook, May 1, 1962 DETAILED DESCRIPTION OF THE INVENTION 0037) U .S. Pat. No. 3,455,203, Pillersdorf, Jul. 15, 1969 0053. This description of our invention is provided to enable any perSon Skilled in the art to make and use the 0.038 U.S. Pat. No. 3,492,912, Ashbrook, Feb. 3, 1970 invention and sets forth the best modes contemplated by the 0039 Foreign Patents Researched inventors of carrying out our invention. 0054) Our invention defines a muzzle attachment for 0040 #233,709, Great Britain, January, 1926 firearms or other thermodynamic jetting devices with design 0041) #633,617, Belgium, October, 1963 features not previously utilized which increase efficiency in the mitigation and control of recoil, noise, flash, barrel whip 0.042 #512,773, Italy, February, 1955 and blast effect. Our invention takes advantage of relatively #623,779, Italy, August, 1961 recent discoveries in the field of ballistics Studies, known as 0043) transition ballistics, that describes the high Velocity motion BRIEF DESCRIPTION OF THE SEVERAL of high pressure propellant gasses from their very first moment of existence through their final instant of preSSure VIEWS OF THE DRAWINGS decline to atmospheric pressure. Our invention conditions, 0044 FIG. 1 displays a Schlieren high speed photograph controls, modifies and mitigates the high Velocity, high of the atmospheric contents of the barrel bore, exiting preSSure gaseous column in a manner that results in greater approximately 2 to 3 milliseconds after propellant ignition efficiency of function than prior art devices Such as Silencers, and directly ahead of the following projectile. Suppressors, mufflers and Sound absorbers have provided. 004.5 FIG. 2 displays the emerging projectile from the 0055. The preferred embodiment of our invention is the barrel bore, approximately 3 milliseconds after propellant
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