Abstract: A coupler for attaching a suppressor to a firearm flash hider. The coupler includes a main body, an inner collar, and an outer collar. The main body defines a through bore configured to closely receive the flash hider at one end and for the passage of the bullet at the other. The main body defines a first threaded portion proximate the central portion thereof, the threads being right-handed threads. The main body defines a sound suppressor attachment device at the second end thereof. The inner collar defines a through bore oriented coaxially thereto. A first end of the through bore is configured to receive the first end of the main body. Proximate the second end of the inner collar, the through bore defines a second inner diameter dimensioned to receive the firearm flash hider. The inner collar carries a plurality of locking fingers, each pivotally mounted on the inner collar via a pivot pin.

Abstract: A muffler for a large caliber gun having a gun tube includes a transition section fitted around the gun tube and engaging the gun tube for preventing the escape of residual combustion gases caused by the firing of a projectile by the gun. Attached to the transition section is at least one pressure vessel which defines a pressure chamber for containing residual combustion gases and attenuating pressure waves. A vent stack is coupled to the pressure vessel at a port of the pressure chamber, and an exhaust blower is disposed in the vent stack for removing residual combustion gases from the pressure chamber between firings. A valve, disposed in the vent stack between the pressure chamber and the exhaust blower, closes during firings of the gun and opens between firings for permitting the exhaust blower to remove residual combustion gases from the pressure chamber.

Abstract: A silencer arrangement for large-caliber guns (3;33,34) including at least one silencer (5;54,55). In order for the system characteristics of the gun (3;33,34) not to be negatively influenced by the heavy weight of the silencer (5;54,55), the silencer is not fastened (5;54,55), as in the case of small-caliber weapons, on the weapon tube or barrel itself, but instead, is arranged on a separate silencer gun carriage (6;39) which is mechanically decoupled from the gun (3;33,34), with the gun carriage (6;39) preferably being configured such that the silencers (5;54,55) may be moved in synchronism with the movement of the gun barrel.

Abstract: A muffler for a large caliber gun having a gun tube includes a transition section fitted around the gun tube and engaging the gun tube for preventing the escape of residual combustion gases caused by a firing of the gun. Attached to the transition section is at least one pressure vessel which defines a pressure chamber for containing residual combustion gases and attenuating pressure waves. A vent stack is coupled to the pressure chamber at a port of the pressure chambers and an exhaust blower is disposed in the vent stack for removing residual combustion gases from the pressure chamber between firings. A valve, disposed in the vent stack between the pressure chamber and the exhaust blower, closes during firings of the gun and opens between firings for permitting the exhaust blower to remove residual combustion gases from the pressure chamber. At least one baffle and orifice assembly in the pressure chamber serves to attenuate pressure waves.

Abstract: A gun silencer (10) comprises an outer tube (16) having disk-shaped baffles (18) separated by intermediate spacers (20, 23, 25, 27) therein having bores through which discharge from a muzzle (14) of a gun barrel (12) travels. The baffles include rear beveled diversion passage pairs (48a and b) adjacent to and leading from front ports (56) into baffle bores (46) and front beveled diversion passage pairs (50a and b) leading from the baffle bores to rear ports (58) in intermediate spacers leading to outer chambers (even numbers 76-88) formed between the intermediate spacers, the baffles, and the outer tube. A bore (28) of the tube is threaded along its entire length. Front and rear faces 40 and 42 of baffles are knurled.

Abstract: A silencer is provided for a machine pistol which silencer minimizes abrasive or frictional contact between the ballistic fired through the silencer in order to extend silencer life. The silencer includes a series concentric screen baffles which are retained in two concentric tubes. In the inner tube, a plurality resilient wipes are provided to contact the ballistic fired through the silencer without allowing contact between any of screen baffles in the fired ballistic.

Abstract: A noise suppressed firearm includes a closed chamber of fixed volume in communication with the barrel bore at a location nearer the breech than the muzzle. The closed chamber communicates with the barrel bore through passage means having a cross-sectional area at least as large as the barrel bore. The passage means communicates with the barrel bore at a location measured from the breech not greater than about 30% of the barrel length.

Abstract: A silencer or noise suppressor for firearms consisting of an elongated body connected to the firearm muzzle into which the expanding gases and projectile are received. The expanding gases are initially received within a chamber and pass through ports defined in a deceleration plate into a chamber communicating with a plurality of baffles arranged in end-to-end relationship. The baffles each include a diverging bore through which the gases may expand, and externally, each baffle includes a spiral vane receiving the expanding and cooling gases. The vanes of adjacent baffles are in communication whereby gas back-pressure within portions of the vanes cause localized gas compression slowing gas expansion and the generation of audible frequencies.

Abstract: A silencer and flash suppressor for sabot projectiles, which includes an accumulation chamber having a projectile entrance surrounding and closed by the gun barrel and a projectile exit which is spaced from the projectile entrance by a distance less than the projectile length. The projectile exit is the smallest diameter of an exit cone which is surrounded by an annular portion of the accumulation chamber, which portion may include one or more perforated baffles.

Abstract: A noise suppressor and stabilizer for a firearm having a number of fluidic scillator laminates each having a number of fluidic pressure controlled oscillators disposed thereon stacked and attached to the muzzle end of a firearm. The pressure controlled oscillators exhaust part of the propellant gases at a frequency either above the range of detection by the human ear or at a less sensitive region of hearing thus lowering the characteristic muzzle blast heard as the bullet exits the muzzle of the firearm. Additional laminates having the pressure controlled oscillators asymmetrically placed are provided to compensate for muzzle climb. Twist of the firearm is controlled by the placement of one or more twist compensating laminates within the stack. One embodiment of the invention provides for laminates of different internal dimensions forms expansion chambers within the noise suppressor.

Abstract: A cylindrical silencer tube is fastened to the muzzle of a firearm or cannon. A quasi-parabolic reflector placed in front of the gun muzzle directs the main discharge gas and sound wave flow rearward to a tuned chamber behind the gun muzzle. The deflected sound waves strike the rear of the chamber and are directed back towards the next oncoming half cycle of sound waves. When the two out of phase waves collide at the entrance of the tuned chamber a cancellation of the noise occurs.The second section of the silencer is comprised of a series of chambers and semispherically shaped hollow baffles which direct part of the discharge gas and sound waves in a different and longer path from the main discharge gas and sound waves and then cause them to reunite in a chamber. The two out of phase colliding wave forms cancel each other.The spacing of the semispherical baffles is such that the discharge sound is raised to ultra sound.

Abstract: A noise and recoil suppressor apparatus for high powered rifles includes a tubular body with an inner central cylindrical bore and an outer cylindrical surface. A butt end portion of the tubular body is adapted for attachment to the muzzle end portion of a high powered rifle and the body provides an opposite tip portion. An annular rib extends outwardly from the outer cylindrical surface and is positioned adjacent the butt end portion of the tubular body. A plurality of space apart latterally extending cylindrical openings extends between the bore and the outer surface of the tubular body, the first plurality of openings being spaced along the tubular body beginning at the tip portion and terminating at the annular rib. A second plurality of openings extends at an acute angle with respect to the bore axis between the bore and the outer cylindrical surface adjacent the annular rib. The second plurality of openings are positioned generally between the annular rib and the first plurality of openings.

Abstract: A basic new method and devices for treating flowing substances such as subdivided solids, colloids, gels, liquids and gases, under varying temperatures, pressure and velocity conditions is disclosed. The method is characterized by forming three concentric types of non-turbulent and unobstructed streams flowing essentially in one direction but differing in velocity from one another, the outermost of which is accelerated to become a surrounding jetstream flowing tangentially past reduced openings interconnecting with the other two types of streams, reducing fluid pressure in them until suction-effect at origin point results, and by final recombination of flows to produce a helically spinning accelerated vortical exiting thrust, to insure either virtually silent atmospheric gaseous discharge or energy-efficient pumping and optimally frictionless travel of liquids or flowing solids through extended conduit, for which devices are supplied by this invention.

Abstract: The present gun silencer includes an internal cardioid-shaped cavity which utilizes the principles of wave mechanics to attenuate the sound of a gun firing without contacting the projectile. The shock wave from a firing is totally internally reflected thereby confining and attenuating the sound from a gun firing. The silencer cavity is shaped in a manner guiding and concentrating shock waves from a gun firing to an exit port at which sound-absorbing material is present.

Abstract: A sound suppressor for a firearm, including a hollow cylindrical casing having an entrance end and an exit end; and at least one disc-shaped baffle element coaxially mounted within the casing and between the ends. The element has front and rear faces with an annular area therebetween and at least one opening in its rear face. A centrally apertured entrance end plug is attached to the entrance end of the casing and is mountable to the muzzle of a firearm. A centrally apertured exit end plug is attached to the exit end of the casing. The baffle element has a primary opening therethrough with at least one slanted sidewall and at least one secondary opening arranged between the annular area and the slanted sidewall.

Abstract: A silencer for the barrel of a firearm comprises a sheath defining an interior space having open opposite ends. The sheath has a longitudinal axis. A plurality of partitioned plates are connected to the sheath and extend across the interior space thereof. Each partition plate has an opening therethrough of a size which is wider than a caliber of the firearm barrel and which lies in a plane which is inclined at an acute angle with respect to the axis. Each partition plate, in a direction along the axis, is rotated around the axis by a selected angle with respect to a previous partition plate to produce a convoluted path for gases discharged from the gun barrel. The first partition plate in the sheath adjacent a firearm valve which is connected to one open end of the sheath, defines an initial expansion chamber for the gases.

Abstract: A small arm having a barrel (11) with at least one transverse bore (14) and a detachable silencer (62) including an expansion chamber (58) communicating with the transverse bore, comprising selectively operable closure means (34) arranged in the path of the combustion gases between the interior of the barrel and the expansion chamber is characterized by an arrangement in which the closure means (34) is prevented from opening or remaining in the open position when the silencer (62) is not in place. Thus, any risk of injury to the shooter is excluded.

Abstract: A cylindrical silencer tube is fastened to the muzzle of a firearm. The interior of the tube is equipped with a series of chambers and conically shaped baffles which direct part of the discharge gases and sound waves in a different path from the main discharge and then causes them to reunite before they discharge the silencer at a point where part of the sound waves have been delayed and are hence out of phase with the principal waves and cause elimination of the noise. Specially constructed inlet and outlet chambers within the tube aid in the suppression of the sound waves and deafening of the noise. The exterior of the cylindrical silencer tube is equipped with a series of cooling fins to aid in the dissipation of heat from the silencer.

Abstract: A suppressor for reducing the muzzle blast of firearms or the like. Several separate absorbent elements are aligned in tandem within a tubular housing, and adjacent absorbent elements are separated by triangular baffles which expose end portions of adjacent absorbent elements. These exposed end surface portions enhance dispersion of propellant gases into and through the absorbent elements. The absorbent elements preferably are made of a knitted ferrous or non-ferrous wire mesh, providing a number of tortuous paths for gas dispersion into the absorbent elements and lowering the temperature of the gases to reduce the noise of the muzzle blast.

Abstract: The invention relates to a hand-held firearm comprising a muzzle silencer (9) and a barrel (11) which is provided with transverse bores and is surrounded by an expansion area (15) into which the transverse bores extend. The transverse bores (14) enable the muzzle velocity of the bullets to be less than Mach 1, in spite of the use of conventional ammunition, and there is consequently no supersonic boom of the bullet. To selectively eliminate the reduction in firing energy involved therein and be able to shoot with maximum firing force, the transverse bores (14) are selectively closable by a locking device (16) which is preferably in the form of a sleeve (16) which surrounds the barrel (11) and is mounted for rotation thereon and is furthermore provided with an actuating member (21) for setting the open or closed position.

Abstract: An acoustic trap for discharging fire arms is provided and consists of an elongated sealed chamber, a support for placing the chamber in an angular downward position so that a barrel of the fire arm can discharge a bullet within the chamber and material for reducing noise level within the chamber.

Abstract: A device for reducing the muzzle blast and flash from large caliber guns is disclosed. A container having a plurality of internal chambers and baffel plates filled with an aqueous foam is mounted to the muzzle of the gun barrel. The foam and chambers co-operate to substantially suppress muzzle blast noise and completely suppress muzzle flash.

Abstract: A sound suppression system having a sound suppression chamber formed from a longitudinally extending tubular housing. One end of the tubular housing is closed by an end plug which has a bore through which passes one end of a tubular member. The tubular member comprises a gun barrel having a cylindrical sleeve surrounding a predetermined length of the gun barrel. The tubular member has a plurality of tubular passages each of which have their one end in communication with the bore of the gun barrel and their other end longitudinally displaced therefrom adjacent the end of the gun barrel to place them in communication with the interior of the sound suppression chamber. A baffle having a cylindrical body approximating the interior diameter of the tubular housing is positioned within the tubular housing. Both the interior of the tubular housing and the outer cylindrical housing of the baffle are threaded so that the baffle may be adjustably positioned through the length of the tubular housing.

Abstract: This invention relates to acoustic liners having a plurality of cavities defining Helmholtz resonators in which the adjacent cavities are asymmetrical causing a pressure imbalance across the coupling means (tube, slot or aperture) between these cavities in the frequency range of interest. Such liners are particularly useful in turbofan engine noise reduction applications where low frequencies are encountered.