US3235996A - Firearm with a slidable, slitted jacket in the cartridge chamber housing - Google Patents

Firearm with a slidable, slitted jacket in the cartridge chamber housing Download PDF

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Publication number
US3235996A
US3235996A US277346A US27734663A US3235996A US 3235996 A US3235996 A US 3235996A US 277346 A US277346 A US 277346A US 27734663 A US27734663 A US 27734663A US 3235996 A US3235996 A US 3235996A
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US
United States
Prior art keywords
jacket
housing
firearm
cartridge
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US277346A
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English (en)
Inventor
Maillard Bernard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brevets Aero Mecaniques SA
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Brevets Aero Mecaniques SA
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Publication date
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/12—Cartridge chambers; Chamber liners

Definitions

  • the present invention relates to firearms of the type where the ammunition has at least a portion of the propelling charge thereof contained in a cartridge case housed, in firing position, in a cartridge chamber provided for this purpose in the firearm.
  • the invention is more especially, but not exclusively, intended for semiautomatic or automatic firearms and in particular for small caliber automatic firearms, for instance of a caliber ranging from 20 to 50 mm.
  • the chief object of the present invention is to provide a firearm of this type which is better adapted to meet the requirements of practice, in particular concerning the conditions where extraction of the cartridge case take-s place.
  • the essential feature of the invention consists in con- 'stituting the side wall of the cartridge chamber, over at least a portion of its length, in the form of a jacket slidable axially in a housing provided for this purpose in the portion of the firearm where said cartridge chamber is located.
  • this sliding jacket and its housing are arranged in such manner that the recoil movement of the jacket with respect to its housing permits a radial expansion of the jacket and therefore a release of its grasp on the case of the cartridge which has just been fired, and advantageously, for this purpose, said jacket is given some taper with respect to its housing and has a radial resiliency producing an expansion thereof when it moves from its front position to its rear position.
  • FIG. 1 is an axial sectional view, with parts cutaway, of a portion of a firearm made according to the invention and wherein a cartridge is shown in firing position just at the time when said cartridge is being struck by the firing pin;
  • FIG. 2 is an axial half section showing the same elements but in the relative positions they occupy during the initial phase of the extraction of the case of the cartridge which has just been fired;
  • FIG. 3 is an elevational view with parts in section showing, opposite its housing, a jacket belonging to a firearm such as illustrated by FIGS. 1 and 2;
  • FIG. 4 shows partly in elevational view and partly in axial section a modification of said jacket.
  • the firearm shown by FIG. 1 include-s a cartridge chamber located at the rear of the barrel 1 of the firearm, introduction of a cartridge (comprising a projectile 2 fitted at the end of a cartridge case 3 containing a propelling charge 4) into said cartridge chamber being ensured by the frontward movement of a sliding breechblock 5 containing a firing pin 6 and an extractor (not shown) whereas extraction of cartridge case 3, after firing of the cartridge, is ensured by the rearward displacement of said breechblock 5.
  • a cartridge comprising a projectile 2 fitted at the end of a cartridge case 3 containing a propelling charge
  • Extraction of an empty cartridge case from the cartridge chamber involves some difiiculties due, on the one hand, to the fact that said cartridge case generally undergoes some swelling after the cartridge has been ICC fired, in particular in the rear portion thereof in the case of a conical cartridge case, and, on the other hand, to the fact that firing must take place with an ammunition which is not greased to facilitate its extraction from the cartridge chamber.
  • the object of the invention is to reduce the above mentioned risks of wedging and therefore practically to eliminate firing incidents inherent in such risks (breaking of the extractor, reduction of the rate of firing and so on).
  • the side wall of the cartridge chamber of the firearm consists, over at least a portion of its length, and preferably over the total length of its main portion 3 and of its neck 3a, of a jacket 7 slidable axially in a housing 8 provided for this purpose in the rear portion of the barrel 1 of the firearm.
  • two fixed abutments are provided for limiting the relative displaceemnt of jacket 7 in housing 8 and for determining the front and rear positions thereof.
  • the front abutment consists, in the example shown, of a shoulder 9 located at the point where the wall of barrel 1 is connected with the housing 8 provided for jacket 7.
  • the rear abutment consists of an inward flange 10 carried by a hoop 11 surrounding the rear portion of said barrel 1.
  • This movement may be fur.- ther facilitated by making said jacket 7 of a material, such for instance as tempered and reheated spring steel, of nitrided steel, possibly covered with an anti-[friction coating, having, with respect to the material of which barrel 1 is made, a friction coefiicient substantially lower than those of the materials general-1y used for making cartridge cases 3 (copper, steel, brass and so on) and to that of the protection varnish which generally protects them.
  • a material such for instance as tempered and reheated spring steel, of nitrided steel, possibly covered with an anti-[friction coating, having, with respect to the material of which barrel 1 is made, a friction coefiicient substantially lower than those of the materials general-1y used for making cartridge cases 3 (copper, steel, brass and so on) and to that of the protection varnish which generally protects them.
  • jacket 7 and its housing 8 are arranged in such manner that said jacket has some taper with respect to said housing, this result being obtained, in the embodiment shown by the drawing, by giving the outer wall of jacket 7 and the inner wall of housing '8 the shape of a frusturn of a cone having its apex toward the front.
  • jacket 7 is given a radial resiliency causing it to expand, also radially, when said jacket 7 passes from its front position illustrated by FIG. 1 (where it must keep cartridge case 3 in position without exerting any substantial radial stress thereon before firing) to its rear position, shown by FIG. 2 (where the release of the grasp exerted by jacket 7 on cartridge case 3 when the shot has been fired due to the swelling of said cartridge case has been exaggerated).
  • the radial resiliency of jacket 7 may be obtained for instance by giving said jacket and its housing 8 a dimension such that said jacket undergoes an internal stress when it is fully engaged in the frontward direct-ion in its housing.
  • jacket 7 longitudinally slits 7,, so as to give said jacket a radial resiliency.
  • Said slits 7 extend over at least the rear portion of jacket 7, said jacket and its housing 8 being dimensioned in such manner that the engagement of jacket 7 frontwardly in its housing 8 produces a resilient constriction effect on said jacket.
  • This effect may produce for instance, for a caliber of 20 mm. a main reduction of diameter of the jacket averaging one tenth of a millimeter.
  • jacket 7 in its housing 8, it suffices, as shown by FIG. 3, to give the apex angle A of the frusto-conical external wall of 0 in a much easier manner, the improvement making it possaid jacket supposed to be free from any radial action,
  • cartridge case 3 is of frusto-conical shape, which is generally the case, the
  • apex angle B of jacket 7 will be preferably greater than the apex angle C of said cartridge case.
  • the mounting of jacket 7 in its housing 8 further comprises, at the front, a packing annular member 12, in the form of a cylindrical ring, fitting,
  • jacket 7 whatever he the axial position of jacket 7, in two circular grooves located opposite each other, respectively in shoulder 9 .and in the front edge of jacket 7.
  • the-re is provided a holding member 13, for instance of steel, capable of preventing jacket 7 from leaving its housing when the firearm is taken to pieces (barrel 1 disengaged from hooping member 11 which carries the rear abutment 10).
  • the strain imposed on the front edge of jacket 7 when it comes into contact with the front abutment 9 may be reduced by giving the inner wall of said jacket, at the front thereof, a frusto-conical shape corresponding subsible to use, without risk of wedging, a cartridge having a cylindrical case.
  • jacket 7 radially resilient over its whole length, for instance by providing it, as in the embodiment illustrated by FIG. 4, with two sets of slits 7,, provided in staggered relation to each other, respectively in the front part and in the rear part of said jacket.
  • a firearm which comprises, in combination, a barrel including, at the rear end thereof, a cartridge chamber housing and a jacket slid able axially to a limited degree in said housing, the outer wall of said jacket and the inner wall of said housing taper-ing toward the front of said firearm, said two walls fitting against each other when said jacket is in its front limit position in said housing, the rear portion of said jacket being split to ensure an outward radial resiliency thereof so that it can expand radially when moved axially to its rear position with respect to said housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US277346A 1962-05-24 1963-05-01 Firearm with a slidable, slitted jacket in the cartridge chamber housing Expired - Lifetime US3235996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU41767A LU41767A1 (fr) 1962-05-24 1962-05-24 Perfectionnements apportés aux armes à feu, notamment automatiques, tirant une munition à douille

Publications (1)

Publication Number Publication Date
US3235996A true US3235996A (en) 1966-02-22

Family

ID=19722973

Family Applications (1)

Application Number Title Priority Date Filing Date
US277346A Expired - Lifetime US3235996A (en) 1962-05-24 1963-05-01 Firearm with a slidable, slitted jacket in the cartridge chamber housing

Country Status (9)

Country Link
US (1) US3235996A (fr)
BE (1) BE631697A (fr)
CH (1) CH389451A (fr)
DE (1) DE1201215B (fr)
ES (1) ES287784A1 (fr)
FR (1) FR1357396A (fr)
GB (1) GB1013678A (fr)
LU (1) LU41767A1 (fr)
NL (2) NL124084C (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793922A (en) * 1973-01-22 1974-02-26 R Angell Collet-chamber retarding system for weapons
US4259892A (en) * 1979-01-31 1981-04-07 Leonard Witt Cartridge-holder
US5479737A (en) * 1994-02-03 1996-01-02 The Marlin Firearms Company Firearm barrel assembly
US20050183318A1 (en) * 2004-01-12 2005-08-25 Mcgivern Kenneth J. Muzzle loading firearm, gun barrel design, projectile system and method of using thereof
US20070261286A1 (en) * 2006-02-23 2007-11-15 Sturm, Ruger & Company, Inc. Composite firearm barrel reinforcement
US20190017764A1 (en) * 2017-03-07 2019-01-17 U.S. Army Research Laboratory Attn: Rdrl-Loc-I Collet Chamber for Weapons
USD849874S1 (en) 2018-01-21 2019-05-28 Vista Outdoor Operations Llc Muzzleloader propellant cartridge
US20220099400A1 (en) * 2019-01-23 2022-03-31 Schmeisser Gmbh Barrel and exchange system for a handgun, method for operating a handgun, and carrier sleeve for a barrel and/or exchange system for a handgun

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631399A (en) * 1898-01-31 1899-08-22 Hiram B Gillette Supplemental barrel for guns.
US783561A (en) * 1903-10-27 1905-02-28 Franklin P White Shell-ejecting mechanism for firearms.
US2847787A (en) * 1955-07-05 1958-08-19 Olin Mathieson Chemical Corp I Firearm with movable chamber and sealing sleeve
US2922242A (en) * 1958-04-28 1960-01-26 Pachmayr Shot pattern control device for shot guns
US2952089A (en) * 1957-01-16 1960-09-13 Olin Mathieson Chamber structure for guns
US2992596A (en) * 1959-07-28 1961-07-18 Hammer Alexander Floating chamber

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE254387C (fr) *
AT41340B (de) * 1909-05-08 1910-03-10 Karl August Braeuning Patronenlager für den Lauf von selbsttätigen Feuerwaffen.
US2889654A (en) * 1957-07-09 1959-06-09 Fever Clifford E La Skirted ball joint seal for a firearm drum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631399A (en) * 1898-01-31 1899-08-22 Hiram B Gillette Supplemental barrel for guns.
US783561A (en) * 1903-10-27 1905-02-28 Franklin P White Shell-ejecting mechanism for firearms.
US2847787A (en) * 1955-07-05 1958-08-19 Olin Mathieson Chemical Corp I Firearm with movable chamber and sealing sleeve
US2952089A (en) * 1957-01-16 1960-09-13 Olin Mathieson Chamber structure for guns
US2922242A (en) * 1958-04-28 1960-01-26 Pachmayr Shot pattern control device for shot guns
US2992596A (en) * 1959-07-28 1961-07-18 Hammer Alexander Floating chamber

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793922A (en) * 1973-01-22 1974-02-26 R Angell Collet-chamber retarding system for weapons
US4259892A (en) * 1979-01-31 1981-04-07 Leonard Witt Cartridge-holder
US5479737A (en) * 1994-02-03 1996-01-02 The Marlin Firearms Company Firearm barrel assembly
US20050183318A1 (en) * 2004-01-12 2005-08-25 Mcgivern Kenneth J. Muzzle loading firearm, gun barrel design, projectile system and method of using thereof
US20070261286A1 (en) * 2006-02-23 2007-11-15 Sturm, Ruger & Company, Inc. Composite firearm barrel reinforcement
US7921590B2 (en) * 2006-02-23 2011-04-12 Strum, Ruger & Company, Inc. Composite firearm barrel reinforcement
US8316568B2 (en) 2006-02-23 2012-11-27 Sturm, Ruger & Company, Inc. Composite firearm barrel reinforcement
US20190017764A1 (en) * 2017-03-07 2019-01-17 U.S. Army Research Laboratory Attn: Rdrl-Loc-I Collet Chamber for Weapons
US10591235B2 (en) * 2017-03-07 2020-03-17 The United States Of America As Represented By The Secretary Of The Army Collet chamber for weapons
USD849874S1 (en) 2018-01-21 2019-05-28 Vista Outdoor Operations Llc Muzzleloader propellant cartridge
US20220099400A1 (en) * 2019-01-23 2022-03-31 Schmeisser Gmbh Barrel and exchange system for a handgun, method for operating a handgun, and carrier sleeve for a barrel and/or exchange system for a handgun
US12066264B2 (en) * 2019-01-23 2024-08-20 Schmeisser Gmbh Barrel and exchange system for a handgun, method for operating a handgun, and carrier sleeve for a barrel and/or exchange system for a handgun

Also Published As

Publication number Publication date
ES287784A1 (es) 1963-08-16
CH389451A (fr) 1965-03-15
NL293096A (fr) 1965-07-26
BE631697A (fr)
GB1013678A (en) 1965-12-15
LU41767A1 (fr) 1963-11-24
NL124084C (fr) 1967-11-15
DE1201215B (de) 1965-09-16
FR1357396A (fr) 1964-04-03

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