Rotary And Sliding Patents (Class 89/185)
  • Patent number: 10139177
    Abstract: The invention relates to a firearm including a component carrier, a barrel having a cartridge chamber for accommodating a cartridge, and a slide that is supported on the component carrier in a longitudinally moveable manner and has a breech block for the barrel and a firing device for the cartridge. The slide bears an extractor for extracting a fired cartridge from the cartridge chamber. An ejector is supported on the slide in a longitudinally moveable manner, which ejector protrudes from the side into the extraction motion path of the cartridge and lies against a stop formed on the component carrier in the end phase of the rearward motion of the slide. The slide, together with the ejector, can be modularly replaced with a second slide having no ejector. For the second slide, said stop assumes the ejector function.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: November 27, 2018
    Assignee: Steyr Mannlicher GmbH
    Inventor: Alexander Giesen
  • Patent number: 10132579
    Abstract: Components of a firearm having a bolt with locking lugs improve shooting accuracy, due to increased coaxial alignment between the bolt, the cartridge, the receiver, and/or the barrel of a firearm. The receiver inner surface is shaped for lug-cleaning and for close tolerance/mating with the lugs only in the locked position and also with a non-threaded, axial surface of the barrel. Thus, the mating surfaces that are instrumental and/or that mainly control coaxial alignment of the receiver, bolt, and barrel are located between the lug stops and the threaded end of the receiver. The lugs may be axially curved or otherwise axially non-linear to tolerate dirt and other debris in a field environment.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: November 20, 2018
    Inventor: Ronald Andrew Foster
  • Patent number: 9921022
    Abstract: A firearm comprising a barrel assembly, forward receiver, and receiver brake. The barrel assembly comprises a barrel, compression spring, gas tube, and front and rear bushings. The gas tube is situated around the barrel between the front and rear bushings and is not attached to the barrel. The compression spring is situated around the barrel between the front and rear bushings and inside of the gas tube. The front and rear bushings are fixedly attached to the forward receiver. The barrel comprises a gas port that is covered by a gas regulator and is in fluid communication with a gas chamber situated between the front bushing and the gas regulator, which is fixedly attached to the barrel. The receiver brake is fixedly attached to the forward receiver on its distal end.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: March 20, 2018
    Inventor: Michael Noyce Merino
  • Patent number: 9696101
    Abstract: A conversion set for a firearm having a grip and a slide locked by a moveable barrel and including an ejecting opening is disclosed. To permit timely opening of the slide when using a replacement barrel which does not lock the slide, the conversion set for use of a replacement barrel which does not lock the slide includes a jacket which may be connected to the slide in a detachable, form-fitting manner. The jacket has a defined mass for the predetermined movement of the slide following a shot being fired.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: July 4, 2017
    Inventor: Christian Kada
  • Patent number: 9500422
    Abstract: A gas operating system for engaging the automatic or semi-automatic action of small arms. The system has a short, displaceable cylinder with a gas block ring secured thereto, a short, fixed piston attached coaxially to a gun barrel, and a single locking nut, advantageously in the form of a threaded flash suppressor. The piston includes gas block rings at its rearward exterior surfaces. The cylinder has a short stroke between radial forward and rear stops fixed on the barrel, which short stroke may be finely adjusted by threaded axial displacement of the rear stop. Pressurized combustion gas from fired ammunition fills a gas chamber formed by the interiors of the piston and cylinder, the gas entering through radial ports in the barrel. The system may be machined and assembled/disassembled with ease and may be readily adapted for employment in any small arms. The system may be fine tuned for usage with a wide spectrum of ammunition.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: November 22, 2016
    Assignee: BERETTA USA CORP.
    Inventors: Andrea Gomirato, Francesco Franzini
  • Patent number: 9476659
    Abstract: A gas cycling firearm comprising a barrel having a breech end, a muzzle end, an inner surface defining a bore having a bore axis, and an outer surface, wherein the muzzle end is spaced a length L from the breech end, the barrel further having a port providing a fluid path between the bore and the outer surface, the port having an axis that intersects the bore axis at a position P from the muzzle end, where P is less than or equal to ? L; and a gas flowpath extending between the gas port and the piston system, the gas flowpath having a length G and a volume V, wherein G is greater than ? L.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: October 25, 2016
    Assignee: F & D Defense LLC
    Inventor: Corby Hall
  • Patent number: 8863638
    Abstract: A cam pin system, includes a cam pin comprising a first cylindrical portion having a first length and a first diameter and a second cylindrical portion concentric with the first cylindrical portion and having a second diameter larger than the first diameter, the second cylindrical portion comprising a through-hole to accommodate the passage of a firing pin. The system includes an end plate detachably connected to the first cylindrical portion of the cam pin, a cylindrical bushing encircling the first cylindrical portion and having an outside diameter approximately equal to the second diameter and a bushing length approximately equal to the first length, and lubricant between the cylindrical bushing and the first cylindrical portion. The cam pin system is configured so that the cylindrical bushing can rotate freely about the first cylindrical portion.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: October 21, 2014
    Inventor: Herbert Wilson Lewis, III
  • Patent number: 8800422
    Abstract: A bolt assembly for a firearm such as an auto-loading or pump action shotgun includes a bolt body, bolt carrier and a bolt head. The bolt head is received within the bolt body and is rotatable within the bolt body to lock the bolt assembly into battery prior to firing the weapon, but does not extend from the bolt body during such rotation. The bolt carrier translates axially relative to the bolt body so as to cause rotation of the bolt head. The extractor for the firearm can be pivotally attached to the bolt body, while the ejector further can be integrated into the bolt assembly for engaging and ejecting a shell or cartridge after firing.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 12, 2014
    Assignee: RA Brands, L.L.C.
    Inventors: Vincent Norton, Travis T. Baker
  • Patent number: 8713833
    Abstract: Disclosed is a bolt assembly that may include several lands that extend along the forward end of the bolt assembly that occupy only about 1 percent to about 12 percent of the surface area of the forward end. Also disclosed is a bolt carrier that defines a cam path that includes an increased unlock dwell time of approximately twice the unlock dwell time provided by a cam path shaped like a standard M-16 cam path. Also disclosed is a bolt carrier that includes a protrusion at a forward end of the bolt carrier with a bore that extends through the protrusion and the bolt carrier at a substantially constant bore diameter, where the protrusion is sized to be received in the barrel extension extends approximately one hundred thousandths of an inch from the end of the bolt carrier.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: May 6, 2014
    Inventor: Karl R. Lewis
  • Patent number: 8677883
    Abstract: Rotary lug breeches and weapons including such rotary lug breeches are disclosed. An example rotary lug breech includes a bolt carrier. Wherein when releasing the bolt, a cam section of a receiver converts a releasing motion into a screwing motion to release a cartridge. During the screwing motion, a first stud surface interacts with the cam section. During a locking process, the first stud surface engages the cam section to perform a pre-control process that rotates a control pin in a slot from a releasing position in which an advancement of the bolt carrier exerts substantially no torque on the bolt, to a control position in which a first slot surface of the slot interacts with the control pin. When the bolt carrier moves forward, the bolt carrier exerts a torque on the bolt to enable the bolt and the bolt carrier move relative to one another.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: March 25, 2014
    Assignee: Heckler & Koch GmbH
    Inventors: Ernst Wössner, Stefan Doll, Martin Stussak
  • Publication number: 20130239795
    Abstract: A cam pin system, includes a cam pin comprising a first cylindrical portion having a first length and a first diameter and a second cylindrical portion concentric with the first cylindrical portion and having a second diameter larger than the first diameter, the second cylindrical portion comprising a through-hole to accommodate the passage of a firing pin. The system includes an end plate detachably connected to the first cylindrical portion of the cam pin, a cylindrical bushing encircling the first cylindrical portion and having an outside diameter approximately equal to the second diameter and a bushing length approximately equal to the first length, and lubricant between the cylindrical bushing and the first cylindrical portion. The cam pin system is configured so that the cylindrical bushing can rotate freely about the first cylindrical portion.
    Type: Application
    Filed: November 28, 2012
    Publication date: September 19, 2013
    Inventor: Herbert Wilson Lewis, III
  • Patent number: 8316755
    Abstract: An anti-rotation feature incorporated between a cotter pin and a sub caliber action device installable within an upper receiver of a firearm. A receiver plate exhibits a notched interior for seating a bolt in reciprocating fashion. A chamfer formed in a side of the bolt intersects a length extending channel of the bolt for seating within the notched interior. The chamfer seating a head of the cotter pin to prevent rotation during bolt travel. A rearward support sleeve seats an opposing guide rod associated with the receiver plate and in order to maintain the bolt assembly. A firing pin exhibits a notch at a location along its shaft and, upon installation within an interior aperture of the bolt, is retained in position by the cotter pin. The firing pin is configured so as to exhibit a reduced diameter end projection upon which is supported a coil spring.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: November 27, 2012
    Assignee: 22 Evolution LLC
    Inventors: John L. Overstreet, Jordan Bowles
  • Patent number: 7975595
    Abstract: A firearm having a bolt carrier comprising an operating rod slot that is open at an end of the bolt carrier. The bolt carrier also includes a cam slot extending from the operating rod slot. The firearm includes a bolt having a protrusion extending from the bolt which enters and is movable within the cam slot. The firearm further includes an operating rod comprising a piston and a foot. The foot is disposed within the operating rod slot to prevent the separation of the bolt from the bolt carrier and to connect the operating rod to the bolt carrier.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: July 12, 2011
    Assignee: RMDI, LLC
    Inventors: Alexander J. Robinson, Darin G. Nebeker, Jon C. Holway
  • Patent number: 7950177
    Abstract: A bolt action firearm includes a bolt assembly with a bolt body having an outer surface defining a longitudinal guide channel extending along a length of the bolt body from a rearward end to a forward end. A receiver defines a central longitudinally extending bore for accommodating the bolt body. A bolt guide is configured to be coupled to the receiver. The bolt guide includes a projection configured for traveling in the guide channel when moving the bolt body in the receiver so as to ensure that the bolt body is at a predetermined correct angular orientation within the receiver.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: May 31, 2011
    Assignee: Thompson/Center Arms Company, Inc.
    Inventors: Mark C. Laney, Matthew Zglobicki
  • Patent number: 7930968
    Abstract: A bolt used in a self loading firearm employing a bolt carrier which in turn carries the bolt. The bolt includes a cam pin receptacle and a cam pin carried by the bolt. The cam pin includes a body having a received end and an exposed end. The received end is received in the cam pin receptacle with the exposed end extending outwardly from a surface of the bolt. A roller is rotatably coupled to the exposed end and rotatable around an axis of the body.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: April 26, 2011
    Inventor: Peter C. Giefing
  • Patent number: 7886470
    Abstract: A method of assembling a firearm is provided. The method includes providing a bolt assembly that includes a bolt carrier that includes a cammed slot and a first passage, a bolt member slidably coupled to the bolt carrier and positioned within the first passage, the bolt member includes at least one aperture and a second passage, a piston member slidably coupled to the bolt member and positioned within the second passage, the piston member includes an elongated slot and a third passage, wherein the elongated slot includes a first length, and a cam pin slidably coupled to at least one of the bolt carrier, the bolt member and the piston member, the cam pin includes a fourth passage; and coupling the bolt assembly within a cavity of the firearm such that the bolt assembly is slidably coupled to an upper receiver of the firearm.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: February 15, 2011
    Inventor: Gerald J. Doiron
  • Publication number: 20100319527
    Abstract: A bolt used in a self loading firearm employing a bolt carrier which in turn carries the bolt. The bolt includes a cam pin receptacle and a cam pin carried by the bolt. The cam pin includes a body having a received end and an exposed end. The received end is received in the cam pin receptacle with the exposed end extending outwardly from a surface of the bolt. A roller is rotatably coupled to the exposed end and rotatable around an axis of the body.
    Type: Application
    Filed: June 23, 2009
    Publication date: December 23, 2010
    Inventor: Peter C. Giefing
  • Patent number: 7726230
    Abstract: The semiautomatic pistol has a rigidly fixed barrel and sights attached thereto. The body of the pistol receives a breechbolt that moves axially in line with the fixed barrel. Cartridges are transferred from the magazine up to the action in the breechbolt, and spent cartridge cases are ejected out of a side eject port disposed on the pistol. Dismounting of the breechbolt is facilitated by a pivotal dismounting post at the rear of the eject port.
    Type: Grant
    Filed: January 8, 2008
    Date of Patent: June 1, 2010
    Inventor: Saim Alper Erdem
  • Patent number: 7627974
    Abstract: New and unique improvements of prior known M4/M16 firearms are disclosed that comprise (A) a bolt which, in addition to all of the normal M4/M16 features is configured or reconfigured to accept a bridged extractor spring which straddles the firing pin and presses against the bottom of the extractor with the bridging wire, and (B) a bridged extractor spring which is a single part, wound with dual spaced helical coils connected with a bridge wire that maintains the spacing at the top of the spring. The bridge wire preferably crosses diagonally between and is tangent to both coils.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: December 8, 2009
    Assignee: Wilsons Gunshop Inc
    Inventor: Douglas Dean Olson
  • Patent number: 6978709
    Abstract: A breech device for bolt-action firearms includes a breech body reciprocating in the receiver and rotatable into locking position. In its front part, the breech body has locking lugs located in three sectors, the locking lugs in at least two sectors being formed in a breech device equipped with a magazine loaded in parallel so that there are four guide surfaces to limit rotation between the receiver and the breech body, and the breech body has a recessed locking surface for the cartridge at its end. The locking surface of the cartridge has been extended downwardly to form a glide surface passing between the locking lugs so that the rear surface of the cartridge case slides on the glide surface and the locking surface into locking position as the cartridge is ejected from the magazine into the cartridge housing.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: December 27, 2005
    Assignee: Sako Oy
    Inventors: Juha Aalto, Kari Kuparinen
  • Patent number: 6609319
    Abstract: New and improved bolt assemblies for M4/M16 firearms capable of firing a remarkably greater number of rounds than previously available M4/M16 firearms are, disclosed that have right and left compression springs that are parallel to each other, straddle the firing pin bore and are retained in partial bores that have proximal and distal ramps descending from their open ends. Additionally, these bolt assemblies advantageously (A) have the extractor pivot pin receiving lug is positioned at the longitudinal center of the mass of the extractor, (B) walls of bolt lugs on the firearm bolt are angled tangent to full radius fillets joining adjacent bolt lugs, (C) the extractor contains a ceramic ball and a captive rubber spring to bias such ball against the extractor pivot pin to retain it in the receiving lug and (D) lugs on the barrel extension are angled tangent to substantial radius fillets joining them.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: August 26, 2003
    Assignee: Knights Armament Company
    Inventor: Douglas D. Olson
  • Patent number: 6564491
    Abstract: An elastic sleeve having a longitudinal slit is positioned between a bolt head and bolt carrier. The sleeve is inserted into an annular space in the bolt carrier when the sleeve is radially compressed allowing relative movement between the bolt head and bolt carrier. The sleeve is supported between the bolt head and an end surface of the bolt carrier when the sleeve is expanded preventing relative movement between the bolt head and the bolt carrier. The periphery of the uncompressed elastic sleeve contacts the bolt carrier or bolt head to thereby effectively damp the elastic sleeve.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: May 20, 2003
    Assignee: Heckler & Koch GmbH
    Inventor: Johannes Murello
  • Patent number: 6536150
    Abstract: The bolt assembly includes a bolt head having a locked position and an unlocked position. The bolt head also has a periphery and an even number of arrangement sites located on the periphery. The bolt assembly further includes a plurality of locking projections positioned at a subset of the arrangement sites on the periphery of the bolt head. It also includes a cartridge extractor disposed at one of the arrangement sites which is not part of the subset and which is located horizontally adjacent the central longitudinal axis of the barrel when the bolt head is in the unlocked position.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: March 25, 2003
    Assignee: Heckler & Koch GmbH
    Inventor: Thomas Schweikart
  • Patent number: 6418655
    Abstract: A shotgun comprises a receiver made from a first material; barrel having a portion extending into the receiver and made from a second material; a collar nut securing the barrel to the receiver; a bolt assembly disposed within the receiver and including a locking block configured to project into the barrel portion and lock the bolt assembly to the barrel prior to firing, the bolt assembly including a firing pin; and a trigger mechanism including a hammer for striking the firing pin.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: July 16, 2002
    Inventor: Ira M. Kay
  • Patent number: 6393961
    Abstract: Straight-pull breechblock (20) with rotating-boss locking mechanism for repeating weapons, having a breechblock head (27) which is guided in a longitudinally and rotationally movable manner in a breechblock housing (22) and has locking bosses (42, 43), and having a breechblock sleeve (24) which carries a bolt handle (28) and in which is mounted a firing pin (23) which is acted upon by a firing spring (53), for the movement of the breechblock head (27) in the longitudinal direction, while the rotational movement thereof is forced by way of the pretension of the firing spring (53) which acts on the firing pin (23), wherein by way of a forcibly controlled spring-mounted stopping lever (58) associated with the breechblock sleeve (24), relative movements between the breechblock head (27) and the breechblock sleeve (24) can be prevented until the breechblock head (27) has gone into the region of the locking chamber (44) of the breechblock housing (22).
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: May 28, 2002
    Assignee: Sommer + Ockenfuss GmbH
    Inventor: Ulrich Ockenfuss
  • Patent number: 6240670
    Abstract: A locking mechanism for use in a wide variety of firearms to assist in securing the firearm from unauthorized use, the locking mechanism being rotatable between an unlocked position where it allows movement of the firing pin and a locked position where it prevents movement of the firing pin.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: June 5, 2001
    Assignee: RA Brands, L.L.C.
    Inventor: David S. Findlay
  • Patent number: 6182389
    Abstract: An improved bolt carrier for a firearm is provided that improves the overall reliability and performance of the firearm bolt assembly. The bolt carrier includes a bolt with a body having a number of lugs extending therefrom. The lugs are integrally connected to the body and define a fillet extending between a sidewall of the lug and the outer surface of the body of the bolt. The bolt also includes an extractor pivotably engaged in a recess formed in the bolt. The extractor has a pair of flanges configured to engage a pair of springs disposed on either side of a firing pin bore extending through the bolt.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: February 6, 2001
    Inventor: Karl R. Lewis
  • Patent number: 6112636
    Abstract: A gas-operated pistol which comprises a frame having a handgrip and adapted to receive a magazine. A slide is mounted for alternating longitudinal movement along the frame. A barrel is provided which is able to pivot at its muzzle end and rotate upwards from a locking engagement via locking means with the frame to allow a cartridge to be removed. An actuating means rotates the barrel upwards after the high pressure period has passed. A cylinder is located above the barrel and communicates with the barrel bore via a passage. The action of propellant gases in the cylinder on the piston urges the slide rearwards. This arrangement reduces the effect of felt recoil on the firer when using very powerful cartridges.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: September 5, 2000
    Inventor: Bernard Christian Besselink
  • Patent number: 6044748
    Abstract: Reliability of a multi-lug breech bolt is improved by modifying the bearing relationship between the bolt lugs and the matching lugs within a gun receiver. This procedure is applied to a gun that has a receiver housing a breech bolt and an extractor. The extractor is coupled to the breech bolt and configured to move relative thereto. The bolt for this gun has at least five radially extending bolt lugs configured for bearing contact with the receiver when positioned for firing. The bolt lugs include a first, second, and third bolt lug with the first and second bolt lugs being adjacent and defining a gap configured to receive the extractor therebetween. The third bolt lug extends from the bolt opposite the gap. Stress imparted to the first and second bolt lugs from firing the gun is reduced by altering the gun to prevent formation of a bearing relationship between the third bolt lug and the receiver when the bolt lugs are positioned for firing. The gun is reassembled as part of the procedure.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: April 4, 2000
    Assignee: Armalite, Inc.
    Inventor: Mark A. Westrom
  • Patent number: 5886281
    Abstract: The invention concerns a firearm for receiving and firing a projectile. The firearm includes an integral casing having a barrel and a breech block receiving area to the rear of the barrel. A breech block is guided through the breech block receiving area by separated guide pins which project from the breech block into respective longitudinal track sections in the barrel. The guide pins are axially separated at opposite ends of the breech block and are circumferentially separated. The longitudinal track sections meet circumferential track sections. The guide pins in the circumferential track sections permit the breech block to be rotated. The breech block has a forward closed barrel position and a rearward open loading position. A breech mount around the breech block has a cam slot that extends longitudinally and into which a cam follower pin from the breech block projects. The breech mount is drawn forward by a spring and driven rearwardly by the gas pressure from detonation of a projectile leaving the barrel.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: March 23, 1999
    Assignee: Waltraud Bucher-Kirstein
    Inventor: Gerhard Kirstein
  • Patent number: 5448940
    Abstract: A modified M16 pistol capable of firing rifle cartridges therein in automatic or semi-automatic mode, which pistol is based upon modified M16 upper and lower assemblies, with a pistol barrel, an M16 gas actuation system, and a spring-biased buffer system mounted on top of the M16 upper receiver assembly.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: September 12, 1995
    Assignee: Olympic Arms, Inc.
    Inventors: Robert C. E. Schuetz, Brian D. Schuetz
  • Patent number: 5351598
    Abstract: An M16 type rifle is disclosed having a gas piston assembly with a relatively large piston area and sufficient stroke to actuate the M16 bolt carrier assembly in order to allow the M16 rifle to be chambered for short low-pressure pistol cartridges such as the 45 ACP, 10 mm, and 40 S&W. The gas piston assembly provides relatively constant contact between the piston rod and the gas carrier key of the conventional M16 bolt carrier assembly.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: October 4, 1994
    Assignee: Olympic Arms, Inc.
    Inventor: Robert C. E. Schuetz
  • Patent number: 4982649
    Abstract: A tubular automatic weapon includes a barrel having a rear terminal portion defining a chamber, and a breech block having a breech block axis and being arranged for movement in axial alignment with the barrel. The breech has a block housing, a rotary head; an iron core secured within the head; a permanent magnet situated within the head and being movable relative to the iron core in inductive relationship therewith; an energy accumulator for storing the kinetic energy derived from the motion of the housing towards a rearward position; and a coupling arrangement for connecting the energy accumulator with the permanent magnet to cause the permanent magnet to be propelled forwardly relative to the iron core by the energy released by the energy accumulator, thereby generating a magnetic field for inducing an igniting current in a cartridge situated in the chamber.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: January 8, 1991
    Assignee: Rheinmetall GmbH
    Inventor: Richard Koine
  • Patent number: 4930399
    Abstract: This invention relates to a shotgun which has low felt recoil, a reliable loading of blunt nosed shells and which can fire a high number of rounds per minute. More particularly, this invention relates to an automatic or semi-automatic shotgun which has a low felt recoil but yet reliably can be fired at a high rate using a variety of blunt nosed shells.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: June 5, 1990
    Inventor: John Trevor, Jr.
  • Patent number: 4920855
    Abstract: A bolt assembly (1) for a self loading rifle comprises a rotating bolt (2) mounted in a bolt carrier (3), the bolt being provided with locking teeth (6) which, in use, interengage with teeth (7) on the barrel extension (8) of the weapon. The angular position of the bolt relative to the bolt carrier is controlled by a cam pin (9) which runs in a cam slot (10) in the bolt carrier. When the bolt is clear of the barrel extension it is locked in the correct angular position by a lever (11) which is pivotally mounted in the bolt carrier.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: May 1, 1990
    Inventor: Frank E. Waters
  • Patent number: 4867040
    Abstract: A semi-automatic rifle including a recoiling barrel adapted to carry rearward the elongated bolt carrier containing the bolt for compressing the recoil spring, and a self-unlocking device including a self-unlocking rod longitudinally slidably mounted on the bolt carrier normally engaging the rear face of the barrel in a battery position and a trigger actuating device for thrusting the self-unlocking rod forward during the early stage of recoil for separation of the bolt carrier from the barrel before the barrel reaches the end of its recoil movement.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: September 19, 1989
    Inventor: Ronnie G. Barrett
  • Patent number: 4765224
    Abstract: An M16-type automatic rifle is provided with an improved gas operating system. The tube extending forwardly from the bolt carrier key is of such length that it permanently mates with the aftwardly extending gas transfer tube as the bolt carrier key shuttles forward and aftward in operation. This arrangement minimizes fouling by combustion products from the firing of ammunition. Modifications to the gas transfer tube and barrel nut assembly accommodate the extended bolt carrier key tube and facilitate quick change of the barrel in the field with a standard tool.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: August 23, 1988
    Inventor: Michael C. Morris
  • Patent number: 4704945
    Abstract: The field of the invention is that of percussion devices used in automatic weapons.The invention consists of integrating the firing pin 12 with carrier piece 1 during the locking phase and then with the movable bolt head 7 during the recoil phase. The integration means consists of levers 17 pivoting on the firing pin about shaft 18 and bearing on surfaces 23 and 26 on the movable bolt head and counterpin 14, respectively.The invention finds its applications in the field of weaponry and, more particularly, in small- and medium-caliber weapons.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: November 10, 1987
    Assignee: Etat Francais
    Inventors: Joel M. Marcon, Jacques A. Durant, Georges H. Simon
  • Patent number: 4655118
    Abstract: It has been shown that at high firing rates or cadences, especially in externally powered firing weapons like Gatling guns, the rebound of the breechblock head during its locking at the rear end of the weapon barrel can have damaging effects. At its rear end the weapon barrel possesses an internal circumferential groove following, in a forward direction of the weapon barrel, an annular flange provided with teeth forming an inner gear toothing. The breechblock head possesses teeth forming an outer gear toothing. In the locked position of the breechblock head the teeth of its outer gear toothing are located in the aforementioned internal circumferential groove and bear upon the teeth forming the inner gear toothing of the annular flange. The damaging effects due to the rebound of the breechblock head can be alleviated or completely avoided by widening the circumferential groove.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: April 7, 1987
    Assignee: Werkzeugmaschinenfabrik Oerlikon-Buhrle AG
    Inventors: Werner Bruderer, Erwin Bohler
  • Patent number: 4619184
    Abstract: A fully gas operated pistol includes a frame unit, a barrel unit, a bolt carrier unit slidably supported on the frame unit and a spring which urges the bolt carrier unit into a forward, bolting position. A path links the breech end of the barrel with a rearward pointing cavity near the muzzle end of the barrel. The cavity is adapted to accommodate a piston of the bolt carrier unit. Gases expanding upon the firing of a bullet expand under pressure into the piston accommodating cavity, thus causing the bolt carrier unit to retract.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: October 28, 1986
    Assignee: The State of Israel Ministry of Defense, Military Industries
    Inventor: Ilan Shalev
  • Patent number: 4604942
    Abstract: A bolt assembly for an automatic firearm which operates using kinetic recoil energy that includes a floating bolt element, a rotatable locking bolt head and a return spring interposed between them, all in communication with the barrel. The bolt head is formed with a cylindrical portion having two crescent shaped projections located at diametrically opposite points along the circumference of the cylindrical portion. The barrel is formed with two diametrically opposite recesses associated with and shaped to correspond to the projections. The barrel is also formed with a pair of grooves, each groove associated with a recess such that the projections may enter and exit the grooves through the recesses. The grooves are staggered with respect to the recesses and have an angular extension such that the projections may enter and be retained within the grooves.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: August 12, 1986
    Assignee: Benelli Armi S.p.A.
    Inventor: Paolo Benelli
  • Patent number: 4563937
    Abstract: A fully gas actuated pistol comprising a frame assembly adapted to fixedly receive a barrel assembly and slidably receive a bolt carrier assembly is disclosed. The barrel assembly is supported and locked at both its muzzle and breach ends. The pistol provides increased bullet velocity, reduced recoil and improved accuracy.
    Type: Grant
    Filed: January 4, 1983
    Date of Patent: January 14, 1986
    Assignee: Magnum Research, Inc.
    Inventor: Bernard C. White
  • Patent number: 4502367
    Abstract: A bolt carrier assembly has a housing (300) for supporting a bolt (317) and a P cross-sectionally shaped member (301) having the longer side of the P-shape secured to the housing, the P-shaped member being forwardly extended with respect to the bolt. The main drive spring (307) is located alongside the wrapped-over portion of the P-shaped member which main drive spring is arranged to provide motion to the housing and P-shaped member. An anti-bounce weight (354) is mounted inside the wrapped-over part of the P-shaped member and has a spring at one end which is compresed by the anti-bounce weight when the P-shaped member is suddenly retarded by the housing to which it is attached striking the barrel assembly. A latch (326-329) is spring biassed and shaped and dimensioned to interleave locking lugs (322) on the bolt (317), the latch being longitudinally retractable with respect to the housing.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: March 5, 1985
    Assignee: Chartered Industries of Singapore Private Ltd.
    Inventor: Leroy J. Sullivan
  • Patent number: 4481858
    Abstract: A single barrel externally powered gun includes a feed mechanism, a bolt assembly, a bolt control assembly and a power transmission system. The bolt control assembly is in the form of a chain drive unit driven continuously along a predetermined path of travel which defines the timing and sequence of loading, ramming, firing and ejecting. The chain drive assembly controls the reciprocating motion of the bolt assembly relative to a fixed non-rotating and non-reciprocating barrel, the bolt being stationary in the firing and loading sequences. The feed mechanism which continuously advances rounds is integrated to the intermittent motion of the bolt by a Geneva wheel mechanism, as the bolt assembly reaches the proper position in its rearward movement. Bolt locking, firing and unlocking are all controlled, and carried on while the chain drive assembly is continuously moving.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: November 13, 1984
    Assignee: Hughes Helicopters, Inc.
    Inventor: Leonard W. Price
  • Patent number: 4475438
    Abstract: A gas operated gun having a receiver (1) including a rear wall (100) at one end and a barrel (10) at the other end and a bolt carrier assembly (3) reciprocal within the receiver is arranged to co-operate with a main drive spring (307) that urges the bolt carrier assembly toward the barrel. The gun is designed so that in one aspect of the invention on an automatic cocking cycle the bolt overtravels the cartridge feed station by an amount equal to or greater than the overall length of a live cartridge.In a further aspect, the gun is additionally designed using parameters calculated such that a substantially constant reaction is felt by a user. The parameters involved are essentially the product of sprung weight (the total weight in kg. of all components driven by the main spring).times.springing force (an average value of spring force that accelerates and retards the sprung weight).times.cycling distance (the length of allowable travel of the bolt carrier assembly in meters) is equal to (0.51).sup.2 .times.0.
    Type: Grant
    Filed: October 4, 1983
    Date of Patent: October 9, 1984
    Assignee: Chartered Industries of Singapore Private Ltd.
    Inventor: Leroy J. Sullivan
  • Patent number: 4418607
    Abstract: A single barrel externally powered gun includes a feed mechanism, a bolt assembly, a bolt control assembly and a power transmission system. The bolt control assembly is in the form of a chain drive unit driven continuously along a predetermined path of travel which defines the timing and sequence of loading, ramming, firing and ejecting. The chain drive assembly controls the reciprocating motion of the bolt assembly relative to a fixed non-rotating and non-reciprocating barrel, the bolt being stationary in the firing and loading sequences. The feed mechanism which continuously advances rounds is integrated to the intermittent motion of the bolt by a Geneva wheel mechanism, as the bolt assembly reaches the proper position in its rearward movement. Bolt locking, firing and unlocking are all controlled, and carried on while the chain drive assembly is continuously moving.
    Type: Grant
    Filed: September 18, 1981
    Date of Patent: December 6, 1983
    Assignee: Hughes Helicopters, Inc.
    Inventor: Leonard W. Price
  • Patent number: 4398448
    Abstract: A buffered bolt assembly is disclosed for use in an automatic weapon. A b is received in a sleeve on a bolt carrier and is movable therein both axially and rotationally. One or more cam pins on the bolt are received in respective cam guides in the sleeve to control the bolt's rotational position as a function of its axial position. The aft end of the bolt is provided with at least one and preferably two aftward-projecting bolt extensions, for which corresponding slots are provided in the aft surface of the sleeve. When the bolt carrier and bolt are in the battery or firing position, the bolt extensions protrude through their respective slots. The bolt extensions are of such a length that during the recoil stroke of the bolt assembly, the aft ends of the bolt extensions are flush with the rear outer surface of the aft wall of the sleeve.
    Type: Grant
    Filed: July 31, 1981
    Date of Patent: August 16, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Clifford E. LaFever
  • Patent number: 4389919
    Abstract: A firing pin block for a firearm of the type having a rotary breech bolt, a reciprocating bolt carrier, complementary locking lugs formed on the bolt and barrel to releasably secure them together, and cam means drivingly connecting the bolt and bolt carrier for opening and closing the bolt. The firing pin block positively prevents discharge of the firearm at any time when the bolt is unlocked. It does not rely on the presence or good condition of any separate parts, but instead coordinates the cam-actuated rotary operation of the locking lugs with relative longitudinal displacements between the bolt and bolt carrier, to cause the latter to block an enlarged abutment formed on the firing pin whenever the bolt is unlocked.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: June 28, 1983
    Assignee: Remington Arms Company, Inc.
    Inventors: Jack L. Kast, Albert R. Eddy, Merle F. Carter
  • Patent number: 4358986
    Abstract: A rifle having a body comprised of hingedly interconnected lower and upper receivers, a trigger and hammer assembly mounted in the lower receiver, a barrel extending from one end of the upper receiver, an integrated bolt assembly removably mounted in the upper receiver, the bolt assembly comprising a bolt carrier slidably mounted on two action rods joined at corresponding first ends by an action plate, the action rods being releasably supported at corresponding ends in the rifle body, a bolt slidably mounted in the bolt carrier, a firing pin slidably mounted in the bolt, compression springs between the action plate and the bolt carrier and retaining means on the action rods to retain the bolt carrier on the action rods and retain the members of the bolt assembly integrated so the bolt assembly can be removed from the upper receiver as a complete unit.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: November 16, 1982
    Inventor: Charles Giorgio
  • Patent number: H144
    Abstract: A firing mechanism for a weapon having a receiver with a chamber for a caidge comprises a bolt and piston which are separately movable toward and away from the chamber and which are engaged with each other for displacing and rotating the bolt into a locked firing position. A buffer is also movable in the receiver and can strike the rear end of the piston. The piston carries a firing pin which can thus be driven into the primer of a cartridge in the chamber. Three sears are provided. Two of the sears are for engaging the piston, one sear for holding the piston in a position with its firing pin away from the cartridge but with the bolt against the chamber and in its locked position. The other sear for the piston holds the piston with the bolt in a position away from the chamber. This is for open bolt operation. A third sear is provided for engaging the buffer for closed bolt operation.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: October 7, 1986
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Giulio V. Savioli