US3845581A - Firearms - Google Patents

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Publication number
US3845581A
US3845581A US00269325A US26932572A US3845581A US 3845581 A US3845581 A US 3845581A US 00269325 A US00269325 A US 00269325A US 26932572 A US26932572 A US 26932572A US 3845581 A US3845581 A US 3845581A
Authority
US
United States
Prior art keywords
chamber
projectile
bore
firearm
barrel
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
US00269325A
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English (en)
Inventor
O Infantino
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.)
DIRECCION GENERAL DE INVESTIGA
Original Assignee
DIRECCION GENERAL DE INVESTIGA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DIRECCION GENERAL DE INVESTIGA filed Critical DIRECCION GENERAL DE INVESTIGA
Application granted granted Critical
Publication of US3845581A publication Critical patent/US3845581A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/74—Obturating or packing devices for gas leak prevention in breech mechanisms
    • 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 invention is also concerned with a firearm including said chamber.
  • the projectile described in the above-mentioned patent application is capable of being totally expelled through the bore of the firearm without leaving any residue therein.
  • Said projectile comprises a body of substantially cylindro-ogival shape having a propellant cavity therein, priming means in said propellant cavity, and an outer, peripheral flange at the rear, terminal end of said body and integral therewith.
  • the maximum outer diameter of the body is equal to, or slightly less than the diameter of said bore across the lands defined between the helical grooves; and the outer diameter of said rear peripheral flange is larger than the diameter of the bore across said lands.
  • the rear peripheral flange When the projectile is fired and impelled through the bore, the rear peripheral flange is deformed or extruded by the walls of the chamber and the projectile body expands under the pressure of firing and engages the lands in the bore, thus causing the projectile to spin while it travels through the bore.
  • the firearm chamber according to the invention is detachably mounted in the breech of the firearm and comprises a tubular body having an inner diameter equal to the diameter of the bore across the lands defined by the helical grooves.
  • One end of the tubular body abuts against the base of the barrel, and the other end has an annular recess adapted to receive and retain the peripheral flange at the rear end of the above mentioned projectile.
  • the firearm chamber of the invention differs from known chambers in that its inner diameter is equal to the diameter of the bore in the barrel across the lands defined by the helical grooves and therefore, it can be used only for firing a projectile having an outer diameter equal or slightly less than the diameter of the bore across the lands.
  • Conventional amunnition i.e., of the type having a case and a bullet fitted at the mouth of the case, cannot be fired from a chamber according to the invention, because if the case fits the chamber, the bullet would be undersized with respect to the bore. Consequently gas leakage would occur since the required compression could not be attained and, furthermore, it would not be possible to obtain gyroscopic stability of the trajectory of the projectile.
  • the chamber is detachably mounted in the breech of the firearm and independent from the barrel, permits manufacturing it from a metal having different characteristics than the metal forming other parts of the firearm, and to replace the chamber or the barrel if one of them should become worn or damaged.
  • a detachable chamber simplifies considerably the operation of making the rifling or helical grooves in the barrel bore, since the rifling could be made in a continuous length of tubing which can then be severed to form individual barrels.
  • the detachable chamber permits independent machining, finishing and heat treating of the chamber and the barrel, which facilitates handling and obtaining high dimensional accuracy.
  • FIG. 1 is an elevation view of a projectile adapted to be used with a firearm including a chamber according to the invention.
  • FIG. 2 is a longitudinal section of a firearm chamber according to the invention.
  • FIG. 3 is a plan view of the chamber.
  • FIG. 4 is a longitudinal section, somewhat schematic, of a firearm indicating the location and arrangement of the firearm chamber. a
  • the firearm chamber of the invention is designed to fire self propelled ballistic projectile such as shown in FIG. 1.
  • This projectile comprises a body 1, of substantially cylindro-ogival shape, having an outer, peripheral flange 2 at the rear, terminal end of the body.
  • the flange 2 is formed integrally with the projectile body and extends substantially at right angles with the longitudinal axis of the projectile.
  • the diameter and thickness of the flange 2 depend on the calibre of th projectile.
  • the firearm shown therein comprises a bolt housing 3 and a barrel 4.
  • the barrel bore has a series of parallel grooves 5 which spiral from the base to the muzzle end of the barrel and define land portions 6 therebetween.
  • the maximum outer diameter of the projectile body 1 is equal to or slightly less than the diameter of the bore across the lands 6.
  • the firearm chamber of the invention comprises a tubular body 7, having an inner diameter equal to the diameter of the bore of the barrel across the lands defined by the helical grooves 5.
  • the forward end 8 of the chamber is adapted to abut against the base of the barrel, and the rear end 9, has an annular recess 10 adapted to receive and retain the peripheral flange 2 at the rear end of the projectile.
  • the recess 10 has an annular surface 10 perpendicular to the longitudinal axis of the chamber, and a cylindrical wall 10'', coaxial with the chamber.
  • the diameter and depth of the recess 10 corresponds with the diameter and thickness of the projectile flange.
  • the chamber is housed in a bore 11 provided in the bolt housing 3 of the firearm and rests on shoulder portions 12.
  • the barrel has a threaded portion 4' which screws into the bolt housing 3 and is secured in place by a locking nut 13. Thus, the chamber is retained between the barrel 4 and the shoulder portions 12.
  • the rear end of the chamber is closed by a cylindrical lock 14 having a percussion pin 14'.
  • the projectile body expands slightly under the pressure of firing and engages the lands in the bore thus causing the projectile to spin while it travels through the bore.
  • the rear flange 2 acts as a stop for the projectile in the chamber before the projectile is fired, and also as a sealing ring while the projectile travels through the bore. As indicated, the projectile is totally expelled from the firearm without leaving any residue therein.
  • a firearm comprising a barrel including a bore having helical grooves and lands between said grooves, and a detachable chamber comprising a tubular body having an inner diameter equal to the diameter of said bore across the lands defined by the helical grooves. one end of said tubular body abutting against the base of said barrel, and the other end having an annular recess adapted to receive and retain a peripheral flange at the rear end of a projectile adapted to be fired from said firearm.
  • annular recess has an annular surface substantially perpendicular to the longitudinal axis of the chamber, and a cylindrical wall substantially coaxial with the chamber.
  • a firearm barrel having a bore, said bore including helical grooves and lands between said grooves; a chamber comprising a tubular body having an inner diameter equal to the diameter of said bore across the lands defined by the helical grooves, one end of said chamber abutting againstthe base of said barrel, and the other end having an annular recess; and a self-propelled ballistic projectile.
  • a self-propelled ballistic projectile comprising a body of substantially cylindro-ogival shape and an outer peripheral flange at the rear terminal end of said projectile body; the annular recess of said chamber being adapted to receive the peripheral flange of said projectile; the outer diameter of the projectile body being at most equal to the inner diameter of said chamher.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
US00269325A 1971-07-06 1972-07-06 Firearms Expired - Lifetime US3845581A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AR23663871 1971-07-06

Publications (1)

Publication Number Publication Date
US3845581A true US3845581A (en) 1974-11-05

Family

ID=3462048

Family Applications (1)

Application Number Title Priority Date Filing Date
US00269325A Expired - Lifetime US3845581A (en) 1971-07-06 1972-07-06 Firearms

Country Status (12)

Country Link
US (1) US3845581A (es)
JP (1) JPS4928200A (es)
BE (1) BE785845A (es)
BR (1) BR7204617D0 (es)
CA (1) CA970613A (es)
DE (1) DE2233023A1 (es)
ES (1) ES404554A1 (es)
FR (1) FR2147979A1 (es)
GB (1) GB1402642A (es)
IL (1) IL39814A (es)
IT (1) IT962458B (es)
NL (1) NL7209436A (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6739083B2 (en) * 2001-09-12 2004-05-25 Bore Science Technologies, L.L.C. Runout correction rifle barrel
US20100031550A1 (en) * 2007-01-18 2010-02-11 Steyr Mannlicher Holding Gmbh Barrel holder for a drop-down barrel weapon
US9541343B2 (en) * 2015-01-21 2017-01-10 James A. Dodson Interchangeable chamber and barrel system
US10330416B2 (en) 2015-01-21 2019-06-25 Wolf Precision, Inc. Interchangeable chamber and barrel system
US11137226B2 (en) * 2019-02-21 2021-10-05 Andrew Bennink Multi-caliber weapon system and components

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US329793A (en) * 1885-11-03 Breech-loading fire-arm
US1191357A (en) * 1915-08-09 1916-07-18 Parke T Snyder Cartridge-projectile.
US2359517A (en) * 1941-03-07 1944-10-03 Robert D Gebeau Simplified artillery mechanism
US2736119A (en) * 1956-02-28 Firearm having chamber member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US329793A (en) * 1885-11-03 Breech-loading fire-arm
US2736119A (en) * 1956-02-28 Firearm having chamber member
US1191357A (en) * 1915-08-09 1916-07-18 Parke T Snyder Cartridge-projectile.
US2359517A (en) * 1941-03-07 1944-10-03 Robert D Gebeau Simplified artillery mechanism

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6739083B2 (en) * 2001-09-12 2004-05-25 Bore Science Technologies, L.L.C. Runout correction rifle barrel
US20100031550A1 (en) * 2007-01-18 2010-02-11 Steyr Mannlicher Holding Gmbh Barrel holder for a drop-down barrel weapon
US8341863B2 (en) * 2007-01-18 2013-01-01 Steyr Mannlicher Holding Gmbh Barrel holder for a drop-down barrel weapon
US9541343B2 (en) * 2015-01-21 2017-01-10 James A. Dodson Interchangeable chamber and barrel system
US10330416B2 (en) 2015-01-21 2019-06-25 Wolf Precision, Inc. Interchangeable chamber and barrel system
US11137226B2 (en) * 2019-02-21 2021-10-05 Andrew Bennink Multi-caliber weapon system and components
US20220146226A1 (en) * 2019-02-21 2022-05-12 Andrew Bennink Multi-caliber weapon system and components
US11674770B2 (en) * 2019-02-21 2023-06-13 Andrew Bennink Multi-caliber weapon system and components

Also Published As

Publication number Publication date
IL39814A0 (en) 1972-10-29
IT962458B (it) 1973-12-20
FR2147979A1 (es) 1973-03-11
JPS4928200A (es) 1974-03-13
GB1402642A (en) 1975-08-13
IL39814A (en) 1976-01-30
ES404554A1 (es) 1975-12-01
DE2233023A1 (de) 1973-01-25
BR7204617D0 (pt) 1974-01-08
CA970613A (en) 1975-07-08
NL7209436A (es) 1973-01-09
BE785845A (fr) 1972-11-03

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