Rifling Or Lining Patents (Class 42/78)
  • Patent number: 10094633
    Abstract: A silencer device for a firearm has a center portion including at least two substantially semi-circular chamber partition wall elements being spaced from one another in the longitudinal direction of the center portion, a housing portion into which the center portion is introduced, wherein between the at least two substantially semi-circular chamber partition wall elements and the inner wall of the housing portion at least one chamber is formed; and a positioning portion being at least connectable to the housing portion. The at least two substantially semi-circular chamber partition wall elements respectively comprise on their outer sides at least one chamfer, which form a lateral passage for explosive gases with the inner wall of the housing portion.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: October 9, 2018
    Inventors: Werner Bertschinger, Hugo Ziegler
  • Patent number: 10001337
    Abstract: A composite multi-lobe barrel is disclosed for directing the path of a dischargeable projectile. The multi-lobe barrel incorporates a plurality of longitudinal stiffening rods into a composite overwrap around an inner liner to enhance axial stiffness. The barrel is comprised of an inner liner defining an axial bore; a plurality of polymer matrix composite (PMC) stiffening rods equidistantly disposed around the inner liner and a PMC outer shell enclosing the stiffening rods. In one embodiment, a PMC inner wrap surrounds and is in direct contact with the inner liner, with the stiffening rods arranged equidistantly around the inner wrap, with this structure enclosed by a PMC outer shell.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: June 19, 2018
    Inventor: David Brian Curliss
  • Patent number: 9939223
    Abstract: A barrel has a barrel body that extends a barrel length and a bore extending through the barrel body. The bore has a cartridge chamber section and a rifled section with a bore diameter. A cartridge shell fits within the cartridge chamber section and the projectile extends from the cartridge chamber section into the rifled section. The cartridge shell with the projectile has a shell length within the bore, the barrel length is less than twice the shell length. The rifled section has rifling grooves between rifling lands, and each of the rifling lands has a land width. The groove diameter is greater than the land diameter by an amount that is more than one half of the land width. The barrel body has an extractor assembly with an arm retractably extending from a cavity. The arm can rotate in the cavity when extended and does not rotate when retracted.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: April 10, 2018
    Assignee: Heizer Defense, LLC
    Inventors: Charles K. Heizer, Thomas C. Heizer, Hedy H. Gahn
  • Patent number: 9874418
    Abstract: A gun barrel for guiding a bullet along a longitudinal axis, the bullet having a diameter, the gun barrel having a circumferential series of lands, each land among the circumferential series of lands being radially displaced from the longitudinal axis a distance at least as great as one-half of the bullet's diameter, each land extending helically about the longitudinal axis; a plurality of sound reflection chambers, each sound reflection chambers among the plurality of sound reflection chambers being positioned between an adjacent pair of lands among the circumferential series of lands, each sound reflection chamber having a muzzle end, and each sound reflection chamber opening radially inwardly; and a plurality of sound reflection walls, each wall among the plurality of sound reflection walls closing one of the sound reflection chambers' muzzle ends.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: January 23, 2018
    Inventors: Jeff A. White, Kevin Campbell
  • Patent number: 9759520
    Abstract: Methods and systems for aligning a point of aim with a point of impact for a projectile device are disclosed. Using a superposition device coupled to the projectile device, at least one optical reference point is superposed within a first target area with at least one beam from the superposition device. A position of at least one of the optical reference points is noted. A projectile is expelled from the projectile device at a second target area, while the position of the at least one optical reference point is maintained, to create the point of impact. The point of aim for the projectile device is adjusted to align with the point of impact while the position of the at least one optical reference point is maintained.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: September 12, 2017
    Assignee: Umarex USA, Inc.
    Inventor: Jack Hancosky
  • Patent number: 9631887
    Abstract: The present invention relates to rifling of a gun barrel to provide grooves and bores in the gun barrel separated by a single edge area and a polygonal area.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: April 25, 2017
    Assignee: F.J. Feddersen, Inc.
    Inventor: Frederick J. Feddersen
  • Patent number: 9581402
    Abstract: A projectile for use with a tapered gun bore having a tapered bore section between the breech and the muzzle. The projectile includes an elongated body having a cylindrical bulkhead with a diameter substantially equal to the large caliber section of the gun bore. A tapered ogive extends from the bulkhead to a front end of the projectile while a tapered tail extends from a rear end of the projectile to the cylindrical bulkhead. A plurality of circumferentially spaced forward grooves extend forwardly from the bulkhead and to a point short of the front end while a plurality of circumferentially spaced rearward grooves extend rearwardly from said midsection and to a point short of a rear end of the body.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: February 28, 2017
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Michael A. Minnicino, II
  • Patent number: 9404704
    Abstract: A muzzle flash suppressor is disclosed. In accordance with some embodiments, the disclosed flash suppressor includes a plurality of prongs having inner surfaces which taper along their length, providing angled expansion of the primary bore of the flash suppressor in the direction of projectile travel. The inner prong surfaces located along the gas flow path angle outwardly, a multi-radius surface is formed between each pair of neighboring prongs, and chamfers and radii are provided at the prong ends. Some embodiments provide for balanced and gradual gas expansion axially and/or radially along the projectile path, thereby allowing muzzle gases to expand/bleed off in a substantially laminar pattern. In some cases, this reduces secondary ignition of muzzle gases and the ambient air, thereby reducing muzzle flash. Also, some embodiments provide for easy clearance or correction of muzzle obstructions, thereby protecting against damage to the flash suppressor and host weapon.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: August 2, 2016
    Assignee: Sig Sauer, Inc.
    Inventors: Harry Andrew Packard, Ethan Lessard
  • Patent number: 9389052
    Abstract: A jacketed bullet having a penetrator constructed of a hard material in line with a slug having a lower modulus. At least a portion of both the slug and the penetrator are then encased by a metal jacket. A plurality of circumferentially spaced and axially extending flutes are formed along the slug and possibly the penetrator. These flutes receive deformation of the jacket upon firing of the bullet into a rifled gun bore to thereby reduce friction between the bullet and the gun bore during operation.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: July 12, 2016
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paul J. Conroy, Daniel R. Gubernat
  • Patent number: 9234716
    Abstract: The present invention relates to rifling of a gun barrel to provide grooves and bores in the gun barrel separated by a single edge area and a polygonal area.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: January 12, 2016
    Inventor: Frederick J. Feddersen
  • Patent number: 9212860
    Abstract: An improve firearm rifling is provided in which the trailing edge face of the land is significantly longer than the rifling land top surface. The trailing edge angle between the trailing edge face and the level of the groove floor surface is a much smaller angle than conventional rifling land trailing edge angle, while the leading edge angle of the disclosed embodiments may be akin to a conventional rifling leading edge angle. Due to this, the present embodiments provide a rifling land profile that is nonsymmetrical, with the trailing edge face being at a much lower angle than the leading edge face which is configured in a more upright orientation.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: December 15, 2015
    Inventor: Daniel Kunau
  • Patent number: 8984793
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides. A plurality of teeth extends along one of the short sides within the internal bore. A disk-shaped bullet fitting within the internal bore may be fired from the firearm. A bullet case having a rectangular orifice is provided to chamber the disk-shaped bullet for propulsion through the rectangular internal bore of the firearm.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: March 24, 2015
    Inventor: Nicholas F. Mirabile
  • Patent number: 8984792
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides. A plurality of teeth extends along one of the short sides within the internal bore. A disk-shaped bullet fitting within the internal bore may be fired from the firearm. A bullet case having a rectangular orifice is provided to chamber the disk-shaped bullet for propulsion through the rectangular internal bore of the firearm.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: March 24, 2015
    Inventor: Nicholas F. Mirabile
  • Patent number: 8959821
    Abstract: A system for firearm barrel modification includes a firearm, a collar and an auxiliary barrel. The firearm has a barrel with holes extending inward from the first muzzle end. The barrel has rifling. The collar surrounds the barrel to serve as a securing anchor for an auxiliary barrel. A sleeve slidably engages onto the firearm from the muzzle. The sleeve contains a tubular component, serving as a barrel extension. The tubular component extends from within the sleeve to form a second muzzle at the opposite end. The mating end of the barrel extension is situated within the sleeve. It butts up against the muzzle and is aligned with the rifling of the gun. Alignment rods protrude from the mating end of the tubular component and insert into corresponding holes at the muzzle end of the firearm. A spring member attached to the sleeve sets in place over the collar.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: February 24, 2015
    Assignee: FBMS Associates, Trustee for Firearm Barrel-Modification System CRT Trust
    Inventor: S. Mill Calvert
  • Patent number: 8938903
    Abstract: To permit ease and efficiency for the extraction of spent cartridge cases from the cartridge chamber of a firearm barrel within a wide range of temperature conditions, the internal tapered surface of the body region of a cartridge chamber is prepared by establishing circumferentially spaced longitudinal straight or curved regions of the internal surface finish to create an internal cartridge chamber geometry having gradually tapered spaced longitudinally relieved linear or spiral areas having longitudinal linear or spiral lands between each of the relieved areas. The circumferentially spaced lands develop controlled impedance to rearward cartridge case movement on cartridge firing to effectively protect the bolt and extractor mechanisms of the firearm against early failure.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: January 27, 2015
    Inventor: Mark C. Larue
  • Publication number: 20150007479
    Abstract: An improve firearm rifling is provided in which the trailing edge face of the land is significantly longer than the rifling land top surface. The trailing edge angle between the trailing edge face and the level of the groove floor surface is a much smaller angle than conventional rifling land trailing edge angle, while the leading edge angle of the disclosed embodiments may be akin to a conventional rifling leading edge angle. Due to this, the present embodiments provide a rifling land profile that is nonsymmetrical, with the trailing edge face being at a much lower angle than the leading edge face which is configured in a more upright orientation.
    Type: Application
    Filed: February 28, 2014
    Publication date: January 8, 2015
    Inventor: Daniel Kunau
  • Publication number: 20140352192
    Abstract: This invention is a precision weapon that utilises solely as a projectile, a precision-ball made out of a suitable material namely solid C260 brass. It employs a smoothbore precision-barrel with a metal toothed rack/rail affixed along the northern hemisphere of the muzzle of the barrel that effectively converts some of the forward motion of the ball into rotational motion so that the ball is mechanically forced to rotate upwards/backwards at very high speed that can run into millions of rotations per minute, vastly improving it's ballistic coefficient and downrange accuracy. The weapon can be produced in a variety of existing types of firearms such as bolt-action, falling-block or semi-automatic, and can be chambered for a variety of calibers. A 5.5625 mm caliber bolt-action rimfire weapon for instance will provide a user with a weapon ideal for hunting small-game or for target shooting purposes.
    Type: Application
    Filed: December 12, 2013
    Publication date: December 4, 2014
    Inventor: Steven Mark Camilleri
  • Patent number: 8869443
    Abstract: A composite gun barrel comprising: an inner rifled liner tube having an outer surface; and an outer sleeve made from a shape memory alloy and having an inner surface for disposition against the outer surface of the inner rifled liner tube; wherein the inner rifled liner tube is configured for guiding projectiles and the outer sleeve is configured for dampening the firing vibrations encountered by the inner rifled liner tube.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: October 28, 2014
    Assignee: ATI Properties, Inc.
    Inventor: Matthew Fonte
  • Patent number: 8857095
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides. A plurality of teeth extends along one of the short sides within the internal bore. The internal bore has an interior barrel surface that is a high friction surface.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: October 14, 2014
    Inventor: Nicholas F. Mirabile
  • Publication number: 20140237879
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides. A plurality of teeth extends along one of the short sides within the internal bore. The internal bore has an interior barrel surface that is a high friction surface.
    Type: Application
    Filed: May 7, 2014
    Publication date: August 28, 2014
    Inventor: Nicholas F. Mirabile
  • Patent number: 8776424
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides. A plurality of teeth extends along one of the short sides within the internal bore. A disk-shaped bullet fitting within the internal bore may be fired from the firearm. A bullet case having a rectangular orifice is provided to chamber the disk-shaped bullet for propulsion through the rectangular internal bore of the firearm.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: July 15, 2014
    Inventor: Nicholas F. Mirabile
  • Patent number: 8776425
    Abstract: A method for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: July 15, 2014
    Assignee: Carrel Innovations Oy
    Inventor: Torolf Pelin
  • Publication number: 20140150320
    Abstract: The present invention relates to rifling of a gun barrel to provide grooves and bores in the gun barrel separated by a single edge area and a polygonal area.
    Type: Application
    Filed: November 14, 2012
    Publication date: June 5, 2014
    Inventor: Frederick J. Feddersen
  • Publication number: 20140150319
    Abstract: A firearm is provided that includes a receiver, a stock, an elongated barrel and a muzzle. The barrel extends from the receiver to the muzzle and has a rectangular internal bore extending from the receiver to the muzzle. The internal bore has two short sides and two long sides A plurality of teeth extends along one of the short sides within the internal bore. A disk-shaped bullet titling within the internal bore may be tired from the firearm. A bullet case having a rectangular orifice is provided to chamber the disk-shaped bullet for propulsion through the rectangular internal bore of the firearm.
    Type: Application
    Filed: November 1, 2012
    Publication date: June 5, 2014
    Inventor: Nicholas F. Mirabile
  • Patent number: 8713839
    Abstract: A firearm with a barrel that uses an ammunition discharge chamber that includes improved throat located between the chamber's free bore and the rifle bore. The improved throat includes a relatively short, inward aligned first step, an intermediate elongated cylindrical body, and a longer, inward aligned second tapered step. Formed on the inside surfaces of the first step, the elongated body and the second step are rifling grooves and lands that gradually their depths and heights from rear to front direction. The two steps are tapered inward between 1.0 to 1.5 degrees. Using a short first step, an elongated cylindrical body with straight sidewalls, a longer second step with continuous grooves and lands that begin gradually in depth and height from rear to front directions, chamber pressure is reduced thereby enabling more gun powder to be used and bullet misalignment in the rifle bore is reduced.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: May 6, 2014
    Inventor: Shawn Carlock
  • Patent number: 8677670
    Abstract: A rifle barrel for a gas-operated rifle includes a metallic liner with a longitudinal bore and a transverse gas port through the liner to the bore intermediate along a length of the liner. A thermally conductive sleeve circumscribes the liner substantially along the length of the liner. A composite wrap circumscribes the sleeve substantially along a length of the sleeve. The composite wrap is separated from the gas port.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: March 25, 2014
    Inventors: Jason Christensen, Roland J. Christensen
  • Patent number: 8635797
    Abstract: A rifling angle calculating method according to the present invention expands a rifling angle by combining a Fourier function and a polynomial function to take only the advantages of the two functions, and thus boundary conditions at the start and end points of the rifling angle may be faithfully satisfied, and an optimum rifling angle for minimizing the maximum rifling force may be calculated.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: January 28, 2014
    Assignee: Agency for Defense Development
    Inventors: Ki Up Cha, Young Hyun Lee, Chang Ki Cho
  • Publication number: 20130239791
    Abstract: A friction preventing apparatus and a method of manufacturing the same are provided. The apparatus includes: a first object; a second object spaced apart from the first object and facing the first object; and a plurality of charged nanoparticles provided on a surface of one of the first and second objects, such that the nanoparticles are disposed between the first object and the second object. A potential difference is formed between the first and second objects. The nanoparticles may be positively charged and may adhere to the first object, and the first object has a potential lower than a potential of the second object. The nanoparticles may be negatively charged and may adhere to the second object, and the second object has a potential higher than a potential of the first object.
    Type: Application
    Filed: October 17, 2012
    Publication date: September 19, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Sung-nae CHO
  • Publication number: 20130239451
    Abstract: The invention concerns a marking for the barrel of a firearm, in particular of a pistol, a rifle, or a carbine, with a barrel cross section the perimeter of which alternately consists of linear, polygonal segments and arched segments, where necessary with transitions between them, whereby the linear, polygonal segments define an inscribed circle, further comprising at least two ribs being provided in or on the arched segments which extend radially inward.
    Type: Application
    Filed: September 6, 2012
    Publication date: September 19, 2013
    Inventor: Gaston Glock
  • Patent number: 8516729
    Abstract: A gun that has a plurality of frangible barrels. At the proximal end of each barrel is a chamber that receives a cartridge. The cartridge has a reduced charge as compared to a conventional cartridge. Each barrel may have an inner sleeve formed from a malleable material. The out member of each barrel is comprised of a rigid material such as, but not limited to, a filled plastic. The inner sleeve is rigid enough to withstand the pressure of the reduced charge cartridge when fired, but is malleable enough to expand from the pressure generated by a standard charge cartridge. When the inner sleeve expands, the outer member fragments and destroys the weapon. The expansion of the inner sleeve and fragmentation of the outer member upon firing a standard charge reduces the propelling force in the bullet. As a result, the weapon is destroyed and the bullet is fired with a greatly reduced force. The barrels on the gun don not rotate.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: August 27, 2013
    Assignee: Brejon Holdings (BVI), Ltd.
    Inventors: John Hayes, David J. W. Lovinger
  • Patent number: 8397413
    Abstract: A muzzleloading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame moves between an open position in which the breech face is away from the breech end of the barrel, and a closed position in which the breech face abuts the breech end of the barrel. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: March 19, 2013
    Assignee: Smith & Wesson Corp.
    Inventors: Mark C. Laney, Gene L. Garland
  • Publication number: 20130055612
    Abstract: A method of producing a superalloy gun barrel includes providing a tubular workpiece made of a cobalt-based superalloy material, the workpiece having at least about 30% by weight of fcc phase and having an inner diameter and an outer diameter. The method further includes placing the workpiece on a mandrel such that the inner diameter is adjacent to the mandrel and compressing the outer diameter of the workpiece at a temperature below a recrystallization temperature of the workpiece using a combination of axial and radial forces so that the mandrel contacts the inner diameter and imparts a compressive hoop stress to the inner diameter of the workpiece.
    Type: Application
    Filed: November 5, 2012
    Publication date: March 7, 2013
    Applicant: DYNAMIC FLOWFORM CORP.
    Inventor: Dynamic Flowform Corp.
  • Patent number: 8333029
    Abstract: An extreme duty machine gun barrel has body having a central bore. The rear opening of the body includes a chamber formed to receive a cartridge. The body has a surface layer covering all surfaces of the body. The body has a diffusion layer extending below the surface layer into an underlying material of the body. The central bore may have rifling defined by lands and grooves formed in the bore. An interior portion of the body may have a hardness of at least 50 HRC and not greater than 55 HRC after the surface layer and diffusion layer are created on the body. The surface layer and diffusion layer may be created by subjecting the body to a ferritic nitrocarburizing treatment followed by an oxy nitrocarburizing treatment. The nitrocarburizing treatments may be repeated. The body may be AISI H13 grade tool steel.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: December 18, 2012
    Inventor: John Noveske
  • Publication number: 20120291614
    Abstract: A firearm includes a noise suppressor comprising ports in the barrel opening into an annulus provided between a barrel and a sleeve extending from adjacent the muzzle to adjacent the receiver. In the annulus are a series of baffles. The most upstream port opens upstream of the most upstream baffle and downstream ports open between adjacent baffles. In some embodiments, the upstream ports are considerably larger than the downstream ports. Propulsion gases escape from the barrel into the annulus before the projectile clears the muzzle. Sabot rounds or shotgun rounds can be safely fired in the weapon because the sabot carrier or shot cup don't begin to expand until it is past the muzzle end so it cannot damage the noise suppressor.
    Type: Application
    Filed: May 16, 2011
    Publication date: November 22, 2012
    Inventor: George Koumbis
  • Publication number: 20120279106
    Abstract: A gun that has a plurality of frangible barrels. At the proximal end of each barrel is a chamber that receives a cartridge. The cartridge has a reduced charge as compared to a conventional cartridge. Each barrel may have an inner sleeve formed from a malleable material. The out member of each barrel is comprised of a rigid material such as, but not limited to, a filled plastic. The inner sleeve is rigid enough to withstand the pressure of the reduced charge cartridge when fired, but is malleable enough to expand from the pressure generated by a standard charge cartridge. When the inner sleeve expands, the outer member fragments and destroys the weapon. The expansion of the inner sleeve and fragmentation of the outer member upon firing a standard charge reduces the propelling force in the bullet. As a result, the weapon is destroyed and the bullet is fired with a greatly reduced force. The barrels on the gun don not rotate.
    Type: Application
    Filed: May 6, 2011
    Publication date: November 8, 2012
    Inventors: John Hayes, David J. W. Lovinger
  • Publication number: 20120272558
    Abstract: An improved barrel includes a first hollow portion having a preferred rectilinear extension direction and an inner surface defining a bore adapted to be travelled over by a projectile, the first hollow portion including an inner layer constituting the inner surface obtained through deposition of diamondoids by a high-vacuum process.
    Type: Application
    Filed: October 20, 2011
    Publication date: November 1, 2012
    Applicant: PROTEC SURFACE TECHNOLOGIES S.R.L.
    Inventors: Fabrizio PITACCO, Michele Tosti
  • Patent number: 8291632
    Abstract: A method of making a gun barrel having a breech end and a muzzle end and a bore extending between the two ends comprises applying to the outer surface of the bore a plurality of swaging dies (5), each of which carries an upstanding helical land (10). The dies are pressed simultaneously against the external surface of the gun barrel such that each land forms a helical recess (14) in the external surface and crystalline deformation to the material of the barrel wall immediately below the external helical recess. The distortion of the external surface results simultaneously in the creation of a plurality of smooth helical ridges (16) on the surface of the bore.
    Type: Grant
    Filed: November 3, 2008
    Date of Patent: October 23, 2012
    Assignee: Transmission Systems Limited
    Inventor: Hugh Taylor
  • Publication number: 20120227302
    Abstract: A composite gun barrel comprising: an inner rifled liner tube having an outer surface; and an outer sleeve made from a shape memory alloy and having an inner surface for disposition against the outer surface of the inner rifled liner tube; wherein the inner rifled liner tube is configured for guiding projectiles and the outer sleeve is configured for dampening the firing vibrations encountered by the inner rifled liner tube.
    Type: Application
    Filed: March 2, 2012
    Publication date: September 13, 2012
    Inventor: Matthew Fonte
  • Patent number: 8261480
    Abstract: A rigid composite structure has a bore formed in a metallic material and a super hard interior segment or segments disposed within the bore. Each segment may be lined adjacent to one another and held under compression within the bore. The segments may be made of super hard materials such as natural diamond, synthetic diamond, polycrystalline diamond, single crystalline diamond, cubic boron nitrate or other superhard composite materials which exhibit low thermal expansion rates and are generally chemically inert. The resultant rigid composite structure may possess higher tolerances to high pressures and high temperatures.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: September 11, 2012
    Inventors: David R. Hall, Scott Dahlgren, Ronald Crockett, Timothy C. Duke, Joshua Sensinger, Joe Fox, Tyson J. Wilde
  • Publication number: 20120192473
    Abstract: A muzzleloading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame moves between an open position in which the breech face is away from the breech end of the barrel, and a closed position in which the breech face abuts the breech end of the barrel. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.
    Type: Application
    Filed: January 16, 2012
    Publication date: August 2, 2012
    Inventors: MARK C. LANEY, GENE L. GARLAND
  • Publication number: 20120192475
    Abstract: A rifling angle calculating method according to the present invention expands a rifling angle by combining a Fourier function and a polynomial function to take only the advantages of the two functions, and thus boundary conditions at the start and end points of the rifling angle may be faithfully satisfied, and an optimum rifling angle for minimizing the maximum rifling force may be calculated.
    Type: Application
    Filed: January 26, 2012
    Publication date: August 2, 2012
    Inventors: Ki Up Cha, Young Hyun Lee, Chang Ki Cho
  • Publication number: 20120180625
    Abstract: A boomerang-shaped projectile, ammunition cartridge including the projectile, and a weapon barrel through which the projectile is fired.
    Type: Application
    Filed: March 4, 2011
    Publication date: July 19, 2012
    Inventor: Mohamed Mounir Gazayerli
  • Publication number: 20120180362
    Abstract: The present invention relates to polygonal rifling of a gun barrel to provide grooves and bores in the gun barrel separated by a flat area which tapers from the bore to the groove. There is an angle from the center of the bore to the corner of the flat area, that is, where the flat area meets the bore. The angle is predetermined by the bore dimensions.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 19, 2012
    Inventor: Frederick J. Feddersen
  • Publication number: 20120131836
    Abstract: A firearm having a stock and an enhanced life barrel attached to the stock. The enhanced life barrel has a tapered bore and either parabolic or 5R rifling. The barrel includes a chamber and a throat. Each of the tapered bore, the chamber, and the throat are lapped and polished to a finish of about 15Ra of better. The enhanced life barrel includes a ferritic nitrocarburizing finish of greater than about 0.0003 inches thick.
    Type: Application
    Filed: August 30, 2011
    Publication date: May 31, 2012
    Applicant: SMITH & WESSON CORP.
    Inventor: DAVID S. FINDLAY
  • Publication number: 20120117846
    Abstract: A firearm with a barrel that uses an ammunition discharge chamber that includes improved throat located between the chamber's free bore and the rifle bore. The improved throat includes a relatively short, inward aligned first tapered step, an intermediate elongated cylindrical body, and a longer, inward aligned second tapered step. Formed on the inside surfaces of the first tapered step, the elongated body and the second tapered step are rifling grooves and lands that gradually their depths and heights from rear to front direction. The two tapered beveled steps are aligned inward between 1.0 to 1.5 degrees. Using a short first tapered step, an elongated cylindrical body with straight sidewalls, a longer second tapered step with continuous grooves and lands that begin gradually in depth and height from rear to front directions, chamber pressure is reduced thereby enabling more gun powder to be used and bullet misalignment in the rifle bore is reduced.
    Type: Application
    Filed: November 16, 2011
    Publication date: May 17, 2012
    Inventor: Shawn Carlock
  • Publication number: 20120110885
    Abstract: A method for producing a gun barrel, in which the barrel is formed from a pipe blank (1) in which barrel rifles (2) are formed against a mandrel (3) having grooves (2b) shaped as the rifles.
    Type: Application
    Filed: July 15, 2010
    Publication date: May 10, 2012
    Applicant: CARREL INNOVATIONS OY
    Inventor: Torolf Pelin
  • Patent number: 8112930
    Abstract: This invention encompasses articles, compositions, and methods that provide enhanced corrosion resistance and wear resistance to firearms, firearm components, and firearm accessories. In one aspect, for example, a substrate comprising a firearm component is coated with a first layer of a corrosion-resistant material such as a first metal, followed by a second thin film layer of an abrasion-resistant material such as a second metal, a ceramic material such as a metal nitride, diamond-like carbon material, or other materials.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: February 14, 2012
    Assignee: RA Brands, L.L.C.
    Inventor: Glen D. Sietsema
  • Publication number: 20110265365
    Abstract: Allows the reduction in the loss of precision of a discharge caused by the progressive heating-up of the barrel during a long succession of discharges, comprising at least: an interior rifled gunbore (1), an outer sleeve (2) mounted coaxially on the rifled gunbore (1) and configured with a high polar moment of inertia to support the strains in the rifled gunbore (1), while at the same time providing rigidity to the conjoined configuration, and a screwed union (3) adapted for the solid mutual fixation of said pieces. At least two holes (5, 6) are additionally provided which traverse the wall of the rifled gunbore (1) equilibrating the temperatures of said rifled gunbore (1) and said outer sleeve (2), in such a manner as to maintain the initially provided pre-strain of the barrel. The outer sleeve (2) may dispose an aperture for gases (1), adapted for the fitting of a repeat mechanism.
    Type: Application
    Filed: October 7, 2009
    Publication date: November 3, 2011
    Inventor: Juam Ramon Alonso Tricio
  • Patent number: 8020333
    Abstract: A rigid composite structure includes a tubular body made from a metallic material and having a first bore formed therein along a longitudinal axis, and one or more segments formed from a super hard material disposed within the first bore. Each segment has a hole formed in the center thereof, and the segments may be positioned end-to-end and adjacent to one another to align the center holes about the longitudinal axis and form a second bore. The segments can be held under compression within the first bore of the tubular body. The segments may be made of super hard materials such as natural diamond, synthetic diamond, polycrystalline diamond, single crystalline 10 diamond, cubic boron nitrate or other superhard composite materials which exhibit low thermal expansion rates and are generally chemically inert. The resultant rigid composite structure may possess higher tolerances to high pressures and high temperatures within the second bore.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: September 20, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: David R. Hall, Ronald B. Crockett, Scott Dahlgren, Timothy C. Duke, Joshua Sensinger, Joe Fox, Tyson J. Wilde
  • Publication number: 20110173864
    Abstract: A rifle barrel for a gas-operated rifle includes a metallic liner with a longitudinal bore and a transverse gas port through the liner to the bore intermediate along a length of the liner. A thermally conductive sleeve circumscribes the liner substantially along the length of the liner. A composite wrap circumscribes the sleeve substantially along a length of the sleeve. The composite wrap is separated from the gas port.
    Type: Application
    Filed: January 5, 2011
    Publication date: July 21, 2011
    Inventors: Jason Christensen, Ronald J. Christensen