EP0438870A1 - Schrotflintenlauf mit Zügen - Google Patents

Schrotflintenlauf mit Zügen Download PDF

Info

Publication number
EP0438870A1
EP0438870A1 EP90313074A EP90313074A EP0438870A1 EP 0438870 A1 EP0438870 A1 EP 0438870A1 EP 90313074 A EP90313074 A EP 90313074A EP 90313074 A EP90313074 A EP 90313074A EP 0438870 A1 EP0438870 A1 EP 0438870A1
Authority
EP
European Patent Office
Prior art keywords
barrel
lands
shotgun
internal surface
deposited
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.)
Withdrawn
Application number
EP90313074A
Other languages
English (en)
French (fr)
Inventor
John Neil Sharp
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0438870A1 publication Critical patent/EP0438870A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F41A21/16—Barrels or gun tubes characterised by the shape of the bore
    • F41A21/18—Grooves-Rifling
    • 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
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F41A21/04—Barrel liners

Definitions

  • This invention relates to an improved shotgun barrel and a method of producing same which increases the accuracy and shot pattern produced by the barrel.
  • a shotgun is a firearm utilising a cartridge which includes a large number of small pellets.
  • these pellets are pushed along the barrel by a wad of packing material until the pellets exit the barrel at which point they start to spread.
  • the amount by which the pellets spread provides a characteristic shot pattern which can be imprinted on a target placed in front of the shotgun.
  • the spread or depression of the pellets in this pattern increases according to the range of the target from the shotgun muzzle.
  • the invention provides a method of producing an improved shotgun barrel comprising the steps of removing the shotgun barrel from its stock and breech assembly, depositing on the internal barrel surface a coating material, so as to form on said exposed internal surfaces a plurality of parallel lands, of a predetermined substantially constant height and replacing barrel on such stock and breech assembly.
  • the material used for deposition on the internal barrel surface is preferably wear resistant, for example chrome, PTFE or a similar plastic substance. Chrome is also known to be deposited on the internal barrel surface of a shotgun in order to stop corrosion thereof and therefore it is advantageous to combine this with the method according to the invention.
  • lands are provided on the barrel's interior wall arranged equidistantly around the internal wall and advantageously between 2 and 4 thousandths of an inch high.
  • the invention also provides an improved shotgun barrel including a plurality of lands on the inner barrel surface, said lands being formed of material deposited on to the barrel's inner surface, and being substantially straight and parallel to the barrel's axis.
  • the lands are between 2 and 4 thousandths of an inch proud of the barrel's inner surface.
  • the lands are formed of chrome or a similar wear resistant material.
  • a shotgun barrel 10 is formed according to usual manufacturing procedures. After being finished according to requirements the barrel 10 is subjected to a material deposition process, for example chrome deposition, operative to form lands on the barrel's internal surface 12.
  • a material deposition process for example chrome deposition
  • Such deposition is by any known process and the deposition of the material to form lands may be by masking areas between lands or by arranging for material to be attracted to the areas on which land formation is required.
  • the lands may be formed using known material deposition processes for example chrome deposition in that the inner surface of the barrel is repeatedly subjected to a material deposition process with the material being restricted to a specific area of the barrel until the lands 14 are built up around the barrel's inner surface.
  • chrome is preferable in that it is already known to chrome the inner surface of a barrel to prevent corrosion and thereby the two processes may be combined other materials may also be used providing they meet the necessary physical characteristics.
  • other metals may also be suitable as may some plastics for example, PTFE or other similar materials.
  • the chrome is deposited so as to form a plurality of lands 14 of which there are six in the preferred embodiment illustrated. These lands are formed so that they stand proud of the internal surface 12 by between 2 and 4 thousandths of an inch. Lands of this depth are effective in channelling the shotgun charge and prevent rotation of the wad whilst still providing minimal impedance to the passage of the wad and the pellets.
  • the lands 14 are provided along the entire length of the barrel and are arranged so as to be parallel at all points to the barrel's central axis. Thus, the lands 14 effectively provide straight rifling of the barrel 10.
  • the improved shotgun barrel according to the invention provides a significant decrease in the amount of spread in a shotgun charge and hence greatly increased accuracy at all ranges.
  • the evenly spaced lands act as straight rifling and retard the wad's natural tendency to spin which would throw the shot into an eccentric circle. Additionally the lands prevent any wad rotation which would be caused by irregularities on the barrel surface.
  • the addition of lands by way of a material deposition process does not effect the safety of the original barrel construction and therefore would not require additional safety checks before use was possible.
  • a further advantage is that the lands may be retrofittted to any existing barrel assembly thus enabling an existing shotgun to be modified according to an aspect of the invention.
  • the barrel may be fully plated or covered to the required land depth and the excess material removed by machinery or another similar method.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemically Coating (AREA)
EP90313074A 1989-11-30 1990-11-30 Schrotflintenlauf mit Zügen Withdrawn EP0438870A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8927108 1989-11-30
GB898927108A GB8927108D0 (en) 1989-11-30 1989-11-30 Improved shotgun barrels

Publications (1)

Publication Number Publication Date
EP0438870A1 true EP0438870A1 (de) 1991-07-31

Family

ID=10667213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90313074A Withdrawn EP0438870A1 (de) 1989-11-30 1990-11-30 Schrotflintenlauf mit Zügen

Country Status (2)

Country Link
EP (1) EP0438870A1 (de)
GB (1) GB8927108D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1327849A1 (de) 2002-01-10 2003-07-16 Glock Gaston Verfahren zur Herstellung einer Laufmarkierung
EP4163581A1 (de) * 2021-10-07 2023-04-12 Fredrick H. Kart Waffenrohr und verfahren zur verbesserung der genauigkeit, geschwindigkeit und haltbarkeit einer waffenwaffe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616293A1 (de) * 1975-05-05 1976-11-18 Olle Tornaes Vorrichtung zur vergroesserung und vereinheitlichung der streuung bei schrotgewehren, insbesondere zum tontaubenschiessen
DE2738783A1 (de) * 1977-08-27 1979-03-01 Langbein Pfanhauser Werke Ag Chusswaffe
US4713904A (en) * 1986-06-16 1987-12-22 Anderson Mark S Automatic choke shot gun

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616293A1 (de) * 1975-05-05 1976-11-18 Olle Tornaes Vorrichtung zur vergroesserung und vereinheitlichung der streuung bei schrotgewehren, insbesondere zum tontaubenschiessen
DE2738783A1 (de) * 1977-08-27 1979-03-01 Langbein Pfanhauser Werke Ag Chusswaffe
US4713904A (en) * 1986-06-16 1987-12-22 Anderson Mark S Automatic choke shot gun

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1327849A1 (de) 2002-01-10 2003-07-16 Glock Gaston Verfahren zur Herstellung einer Laufmarkierung
EP4163581A1 (de) * 2021-10-07 2023-04-12 Fredrick H. Kart Waffenrohr und verfahren zur verbesserung der genauigkeit, geschwindigkeit und haltbarkeit einer waffenwaffe
US11933565B2 (en) 2021-10-07 2024-03-19 Frederick H. Kart Firearm barrel and method of improving projectile weapon accuracy, velocity and durability

Also Published As

Publication number Publication date
GB8927108D0 (en) 1990-01-31

Similar Documents

Publication Publication Date Title
US5685100A (en) Bullet cartridge casing identification system
US3154016A (en) Ballistic projectile
US8291632B2 (en) Projectile weapons
EP3719440B1 (de) Verfahren zur erzeugung einer bruchstruktur auf einem gefechtskopf
US5378499A (en) Method of applying abrasives to bullets for use in pressure (fire) lapping of gun barrels
US3208386A (en) Strip bullet
US3496667A (en) Choked shotgun with rifled barrel
WO1995008747A1 (en) Match performance .22 caliber cartridge
US4608927A (en) Segmented sabot
EP0438870A1 (de) Schrotflintenlauf mit Zügen
EP1488189B1 (de) Patrone
US3396661A (en) Progressive burning firearm propellant
US7127996B2 (en) Dimpled projectile for use in firearms
US1895207A (en) Method of forming projectiles
RU2457419C1 (ru) Способ создания защитно-антифрикционного покрытия на внутренней поверхности канала ствола стрелково-артиллерийских систем
US2658298A (en) Shotgun barrel and choke
US7975616B2 (en) Bullet for black powder firearms
RU2150063C1 (ru) Ствол огнестрельного оружия
RU2686808C1 (ru) Пулевой снаряд для гладкоствольного оружия
US20200124387A1 (en) Achieving desired bullet pull strength using adhesive sealants and related methods
US2498052A (en) Method of retarding erosion of gun barrels
US10712113B1 (en) Piecewise helical barrel fluting
RU2224208C2 (ru) Патрон
DE2838208A1 (de) Patrone fuer handfeuerwaffen
WO2009056082A1 (de) Munition zum verschliessen aus einem glatten rohr

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE DK ES FR GB GR IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920201