US3736693A - Firearm barrel - Google Patents

Firearm barrel Download PDF

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Publication number
US3736693A
US3736693A US00106264A US3736693DA US3736693A US 3736693 A US3736693 A US 3736693A US 00106264 A US00106264 A US 00106264A US 3736693D A US3736693D A US 3736693DA US 3736693 A US3736693 A US 3736693A
Authority
US
United States
Prior art keywords
barrel
cartridge chamber
cartridge
section
case
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
US00106264A
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English (en)
Inventor
T Koch
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.)
Heckler und Koch GmbH
Original Assignee
Heckler und Koch GmbH
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 Heckler und Koch GmbH filed Critical Heckler und Koch GmbH
Application granted granted Critical
Publication of US3736693A publication Critical patent/US3736693A/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
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/12—Cartridge chambers; Chamber liners

Definitions

  • the invention relates to a firearm barrel especially for hand firearms, with a cartridge chamber embodying release grooves.
  • release grooves are used which are grooves cut in the wall of the cartridge chamber extending in the longitudinal direction of the chamber nearly to the base and in which a counter pressure can be developed which hinders adherence of the cartridge case to the wall of the cartridge chamber.
  • release grooves are very time consuming, there being a relatively large number of grooves distributed around the periphery of the cartridge chamber. Furthermore it is particularly difficult to maintain the necessary very close tolerances.
  • These release grooves must in fact have not only a very accurate width and depth but they must commence at an exactly defined point at the forward end of the cartridge chamber, must follow the tapered rearward enlargement of the cartridge chamber and must run out shortly in advance of the rear end of the cartridge chamber in order that the sealing effect of the case shall be completely maintained at its rear end.
  • the invention is directed to the problem of providing a cartridge chamber having release grooves, which is much more simple to produce and moreover has favorable properties compared with the known cartridge chamber.
  • This object is attained according to the invention by the fact that the cartridge chamber, just like the drawn part of the barrel, has approximately the form of a polygon with rounded edges as seen in section and is so proportioned that the sides of the polygon are tangential to the cartridge case.
  • such a cartridge chamber is much more simple to produce than a chamber which has a plurality of release grooves which must be cut individually.
  • a cartridge chamber can be produced, in the same way as a barrel having a polygonal cross section, by means of a punch, drift or mandrel the cross section of which also corresponds to the internal cross section of the cartridge chamber. In this case all additional work for producing the release grooves is eliminated by the approximate polygonal shape of the cartridge chamber formed.
  • the approximate polygonal cross section of the cartridge chamber has the further advantage that the cartridges are only in line contact with the part of the barrel surrounding the cartridge chamber. Consequently the transfer of heat between the barrel and the cartridge case is essentially reduced so that the danger of self'firing of the cartridge is minimized. It is therefore possible with the barrel according to the invention to fire a greater number of cartridges than with a barrel of known type.
  • the line contact between the cartridge case and the barrel is also of advantage for firing training cartridges of synthetic material since owing to the line contact the danger of a synthetic material cartridge jamming in the barrel owing to overheating is reduced. Also in this way the barrel according to the invention is preferable to the normal barrels.
  • the polygonal profile of the cartridge chamber merges progressively into a circular profile which commences near the outer end of the cartridge chamber. Furthermore it is convenient for the approximate polygonal profile of the cartridge chamber to have the same twist as the rifling of the barrel. In this case it is possible to forge the rifling of the barrel and the cartridge chamber in one working operation.
  • the profile of the cartridge chamber advantageously has a greater number of corners than the barrel rifling since a greater number of release grooves distributed around the periphery of the cartridge case has a better effect. In many cases it is then convenient to choose the number of corners of the profile of the cartridge chamber so that is a simple multiple of the number of the riflings provided in the barrel.
  • FIG. 1 is a longitudinal section through the rear part of a barrel according to the invention and FIG. 2 is a section on the line [I II through the barrel according to FIG. 1 on a larger scale.
  • the barrel shown in the drawing embodies a drawn part 1 and a part 2 with the cartridge chamber 3 which is shaped in a single working operation by punching, broaching or forging on a suitably profiled mandrel.
  • the drawn part 1 of the barrel is provided with approximately polygonal rifle grooves as proposed heretofore.
  • the approximate polygonal profile of the drawn barrel part 1 merges progressively into the approximate polygonal profile of the cartridge chamber 3 as will be seen from FIG. 2.
  • the cartridge chamber 3 has a cross-section approximately in the form of a decagon with rounded corners and sides so proportioned that the side parts 4 of the cartridge case 5 are tangential as shown dotted in FIG. 1.
  • I-Iollow spaces 7 are thus produced in the region of the corners 6 between the wall of the cartridge chamber 3 and the outer surface of the case 5, which act as release grooves.
  • At the rear end of the cartridge chamber are approximate polygonal profile merges, as indicated in FIG. 1, into a part 8 of the length 9 of circular cross-section which permits the cartridge to be sealed in the cartridge chamber on firing the shot in the desired manner.
  • the grooves formed by the rounded comers 6 of the cartridge chamber 3 have the same twist as the rifling in the barrel part 1 in the embodiment shown. Then a single mandrel, drift or punch can be used for forging the barrel, which has a portion corresponding to the cross-section of the drawn barrel with which portion corresponding to the cartridge chamber is associated.
  • This mandrel or the like can be withdrawn rearwardly from the barrel after finishing the barrel.
  • the number of corners of the profile of the cartridge chamber is a simple multiple of the rifling.
  • the rifling merges into corresponding parts of the polygonal form of the cartridge chamber and it is sufiicient to include further polygonal parts between these portions.
  • the barrel shown in the drawing has five rifling elements.
  • cartridge chamber can be chosen according to the type of weapon for which the barrel is to be used and the selection of a different number of release grooves is possible. It is also possible to utilize cartridge chambers according to the invention for larger weapons and then the cartridge chamber may be brought to the desired polygonal form by chip removal machining, for example by broaching or grinding.
  • the combination including a substantially cylindrical cartridge case and a cartridge chamber for receiving the cylindrical cartridge case, the cartridge chamber having approximately a polygonal cross-section with the corners thereof being rounded, and the approximate polygonal shape of the cartridge chamber selected so that the sides thereof are tangential to the cylindrical cartridge case received therein and whereby release grooves are formed.
  • the combination including a substantially cylindrical cartridge case and a cartridge chamber receiving the cylindrical case and embodying release grooves in which the cartridge chamber has substantially the shape in cross-section of a polygon with the corners thereof being rounded and portioned so that the sides thereof are tangential to the cylindrical cartridge case received therein.
  • the combination including a substantially cylindrical cartridge case and a barrel comprising a barrel part and a cartridge chamber having approximately a polygonal cross-section with the corners thereof being rounded, and the approximate polygonal shape'of the cartridge chamber selected so that the sides thereof are tangential to the cylindrical cartridge case received therein and whereby release grooves are formed.
  • the combination including a substantially cylindrical cartridge case and a barrel having a drawn barrel part and a cartridge chamber receiving the cylindrical case and embodying release grooves in which the cartridge chamber has substantially the shape in cross-section of a polygon with the corners thereof being rounded and portioned so that the sides thereof are tangential to the cylindrical cartridge case received therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Centrifugal Separators (AREA)
  • Forging (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US00106264A 1967-03-08 1971-01-13 Firearm barrel Expired - Lifetime US3736693A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671553875 DE1553875A1 (de) 1967-03-08 1967-03-08 Lauf,insbesondere fuer Handfeuerwaffen

Publications (1)

Publication Number Publication Date
US3736693A true US3736693A (en) 1973-06-05

Family

ID=5676987

Family Applications (1)

Application Number Title Priority Date Filing Date
US00106264A Expired - Lifetime US3736693A (en) 1967-03-08 1971-01-13 Firearm barrel

Country Status (7)

Country Link
US (1) US3736693A (en。)
BE (1) BE711811A (en。)
DE (1) DE1553875A1 (en。)
DK (1) DK132000C (en。)
FR (1) FR1556654A (en。)
GB (1) GB1208361A (en。)
SE (1) SE342905B (en。)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066000A (en) * 1974-04-25 1978-01-03 Brunswick Corporation Machine gun
US20120180362A1 (en) * 2011-01-17 2012-07-19 Feddersen Frederick J Gun barrel rifling
US20140075805A1 (en) * 2011-07-11 2014-03-20 Mark C. LaRue Firearm barrel having cartridge chamber preparation facilitating effiecient cartridge case extraction and protection against premature bolt failure
US20140260945A1 (en) * 2013-03-15 2014-09-18 Frank DeSomma Grooved firearm chamber
USD787005S1 (en) 2016-01-18 2017-05-16 Patriot Ordnance Factory, Inc. Firearm upper receiver
USD794153S1 (en) 2013-03-15 2017-08-08 Patriot Ordnance Factory, Inc. Firearm trigger
US10012462B2 (en) 2015-01-20 2018-07-03 Patriot Ordnance Factory, Inc. Bolt carrier support system
US10036601B2 (en) 2013-10-29 2018-07-31 Patriot Ordnance Factory, Inc. Ambidextrous bolt hold open
US10132587B2 (en) 2016-01-19 2018-11-20 Patriot Ordnance Factory, Inc. Reduced weight firearm
US10197348B2 (en) 2015-01-20 2019-02-05 Patriot Ordnance Factory, Inc. Adjustable gas block system
US10578379B2 (en) 2015-11-04 2020-03-03 Patriot Ordinance Factory, Inc. Firearm bolt carrier assembly kit
US20230124564A1 (en) * 2020-06-23 2023-04-20 Diehl Metall Stiftung & Co. Kg Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case
EP3999799A4 (en) * 2019-07-16 2023-07-26 True Velocity IP Holdings, LLC POLYMER AMMUNITION WITH TARGET, CARTRIDGE AND METHOD OF PRODUCTION

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US45898A (en) * 1865-01-10 Improvement in rifling breech-loading fire-arms
US119846A (en) * 1871-10-10 Improvement in rifled fire-arms
US1165621A (en) * 1913-10-15 1915-12-28 Savage Arms Company Firearm.
US1275028A (en) * 1918-05-08 1918-08-06 Ben Holter Rifle-barrel.
GB605136A (en) * 1945-12-14 1948-07-16 Reginald Vernon Shepherd Improvements in or relating to means for facilitating the removal of spent cartridges from barrels of guns

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US45898A (en) * 1865-01-10 Improvement in rifling breech-loading fire-arms
US119846A (en) * 1871-10-10 Improvement in rifled fire-arms
US1165621A (en) * 1913-10-15 1915-12-28 Savage Arms Company Firearm.
US1275028A (en) * 1918-05-08 1918-08-06 Ben Holter Rifle-barrel.
GB605136A (en) * 1945-12-14 1948-07-16 Reginald Vernon Shepherd Improvements in or relating to means for facilitating the removal of spent cartridges from barrels of guns

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066000A (en) * 1974-04-25 1978-01-03 Brunswick Corporation Machine gun
US20120180362A1 (en) * 2011-01-17 2012-07-19 Feddersen Frederick J Gun barrel rifling
US20140075805A1 (en) * 2011-07-11 2014-03-20 Mark C. LaRue Firearm barrel having cartridge chamber preparation facilitating effiecient cartridge case extraction and protection against premature bolt failure
US8938903B2 (en) * 2011-07-11 2015-01-27 Mark C. LaRue Firearm barrel having cartridge chamber preparation facilitating efficient cartridge case extraction and protection against premature bolt failure
EP2867606A4 (en) * 2012-06-27 2016-07-06 Mark C Larue ARMS ROLL WITH CARTRIDGE BEARING PREPARATION FOR EFFICIENT CARTRIDGE SLEEVE EXTRACTION AND PROTECTION AGAINST PREMATURE BOLTING DEFECT
US20140260945A1 (en) * 2013-03-15 2014-09-18 Frank DeSomma Grooved firearm chamber
USD794153S1 (en) 2013-03-15 2017-08-08 Patriot Ordnance Factory, Inc. Firearm trigger
US10036601B2 (en) 2013-10-29 2018-07-31 Patriot Ordnance Factory, Inc. Ambidextrous bolt hold open
US10801807B2 (en) 2013-10-29 2020-10-13 Patriot Ordnance Factory, Inc. Gas block with quick release sling attachment
US10012462B2 (en) 2015-01-20 2018-07-03 Patriot Ordnance Factory, Inc. Bolt carrier support system
US10197348B2 (en) 2015-01-20 2019-02-05 Patriot Ordnance Factory, Inc. Adjustable gas block system
US10352636B2 (en) 2015-01-20 2019-07-16 Patriot Ordnance Factory, Inc. Bolt carrier support system
US10578379B2 (en) 2015-11-04 2020-03-03 Patriot Ordinance Factory, Inc. Firearm bolt carrier assembly kit
USD787005S1 (en) 2016-01-18 2017-05-16 Patriot Ordnance Factory, Inc. Firearm upper receiver
US10132587B2 (en) 2016-01-19 2018-11-20 Patriot Ordnance Factory, Inc. Reduced weight firearm
US10739096B2 (en) 2016-01-19 2020-08-11 Patriot Ordnance Factory, Inc. Reduced weight firearm
EP3999799A4 (en) * 2019-07-16 2023-07-26 True Velocity IP Holdings, LLC POLYMER AMMUNITION WITH TARGET, CARTRIDGE AND METHOD OF PRODUCTION
US20230124564A1 (en) * 2020-06-23 2023-04-20 Diehl Metall Stiftung & Co. Kg Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case
US12366438B2 (en) * 2020-06-23 2025-07-22 Diehl Metall Stiftung & Co. Kg Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case

Also Published As

Publication number Publication date
BE711811A (en。) 1968-07-15
DK132000B (da) 1975-10-06
DE1553875A1 (de) 1971-08-12
GB1208361A (en) 1970-10-14
FR1556654A (en。) 1969-02-07
SE342905B (en。) 1972-02-21
DK132000C (da) 1976-03-08

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