EP0789217B1 - Gas-operated automatic firearm, particularly a shotgun - Google Patents
Gas-operated automatic firearm, particularly a shotgun Download PDFInfo
- Publication number
- EP0789217B1 EP0789217B1 EP97101318A EP97101318A EP0789217B1 EP 0789217 B1 EP0789217 B1 EP 0789217B1 EP 97101318 A EP97101318 A EP 97101318A EP 97101318 A EP97101318 A EP 97101318A EP 0789217 B1 EP0789217 B1 EP 0789217B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- shotgun
- barrel
- piston
- cylinders
- 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
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
- F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
- F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
-
- 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
- F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
- F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
- F41A5/20—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated using a gas piston arranged concentrically around the barrel
-
- 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
- F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
- F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
- F41A5/24—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated by direct action of gas pressure on bolt or locking elements
-
- 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
- F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
- F41A9/38—Loading arrangements, i.e. for bringing the ammunition into the firing position
- F41A9/39—Ramming arrangements
- F41A9/42—Rammers separate from breech-block
- F41A9/44—Fluid-operated piston rammers
Definitions
- the present invention relates to a gas-operated automatic shotgun, as for example described in FR 68 279 E.
- Autoloading shotguns generally include a bolt mechanism linked to a piston and cylinder assembly which is operated by a portion of the gas generated on discharge of a round and bled from the gun barrel to the cylinder.
- the gas port is generally arranged approximately in the median third of the bore, slightly more than halfway along the length of the barrel.
- a main problem of auto-loading shotguns is the necessity to fire shells of different power and to ensure a correct operation with the weakest shells, the gas port section is rather large to allow the passage of a sufficient portion of gas. Also the diameter of the piston has to be greater than that of the bore.
- US-4,102,242 discloses a gas-operated shotgun provided with a pair of gas cylinders mounted on opposite sides of the barrel at a somewhat forward position of the barrel.
- the cylinders have respective pistons engaging an inertial weight slidably mounted on the magazine.
- the inertial weight is connected to the bolt mechanism by a pair of action bars.
- the barrel of this shotgun must have a minimum length set by the forward position of gas cylinders and related gas ports.
- the aim of the present invention is to provide a gas operated shotgun, wherein the length of the barrel can be selected as desired while always ensuring a perfect automatic operation.
- an object of the invention is to provide a gas operated shotgun with an improved automatic operation with respect to conventional gas operated shotguns even, especially, for example, when firing low power ammunition.
- a further object of the invention is to provide a gas-operated shotgun wherein the expansion chamber and the piston are less subject to clogging.
- a gas-operated shotgun generally designated by the reference numeral 1, includes a barrel 3 having a cartridge chamber 5 that is connected with the cylindrical portion 7 of the barrel by a cone portion 9.
- a breech 11 is actuated by a kinematic system receiving energy from gas that arrives from a gas port formed in the barrel in a per se known manner.
- a smoothbore shotgun has a breech 11 with a rotating head 13, of the type described for example in Italian patent No. 1.172.795 and in the corresponding European patent No. 0128125 and US patent No. 4.604.942, in the name of this same Applicant.
- Shotgun 1 includes at least one gas port 15 that is located in cylindrical portion 7 of barrel 3, proximate to cone 9, and is suitable to connect the bore of barrel 3 to an expansion chamber 17 that is formed inside a cylinder 19 associated with the barrel 3 of the weapon.
- Expansion chamber 17 is formed, at one end, by a piston 21 that can slide inside cylinder 19 and is associated with an actuation rod 23 adapted to act on breech 11 and, at the other end, by a closure 25.
- Closure 25 is constituted by a threaded cylindrical body adapted to engage a corresponding thread 27, formed in cylinder 19.
- the cylindrical body includes a protrusion 29 adapted to abut against the end of piston 21.
- Closure 25 also includes a pressure limiting valve 31 constituted by a hole 33 that can be closed by a ball 35 that can move in contrast with a spring 37.
- the shotgun according to the invention advantageously has two cylinders 19 that are arranged at the sides, between barrel 3 and magazine 39, as shown in Figure 3.
- the operation of the shotgun according to the invention is as follows.
- Figure 1 the firearm is shown in the idle position, ready to fire, with the breech closed, cartridge 41 in the barrel, and expansion chamber 17 empty.
- the invention achieves the intended aim and objects, providing a shotgun which, by virtue of the characteristic position of the gas port near the cartridge chamber, can be provided with any barrel length according to the requirements.
- a further advantage of the invention is that the gas is taken when the pressure is highest, ensuring excellent operation even with the weakest cartridges.
- the gas cylinder has a substantially smaller diameter than conventional cylinders.
- the diameter of the gas cylinder according to the invention is approximately half of conventional ones, thereby reducing the gas portion taken from the cartridge chamber, with consequent less clogging of the cylinder and of the piston and less energy drawn from the charge of the cartridge. This also reduces undesired effects on the shooting pattern.
- the recoil of the shotgun would cause the bolt to initially contrast the thrust of the pistons because of their reduced diameter. This would cause a delay in the opening of the bolt and this delay is added to the delay caused by the rotating bolt head.
- the operation of the firearm is thus greatly improved especially when using rounds with cardboard shells.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Toys (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Eye Examination Apparatus (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Endoscopes (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT96MI000229A IT1282015B1 (it) | 1996-02-08 | 1996-02-08 | Arma automatica a presa di gas |
ITMI960229 | 1996-02-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0789217A1 EP0789217A1 (en) | 1997-08-13 |
EP0789217B1 true EP0789217B1 (en) | 2003-03-26 |
Family
ID=11373182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97101318A Expired - Lifetime EP0789217B1 (en) | 1996-02-08 | 1997-01-29 | Gas-operated automatic firearm, particularly a shotgun |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0789217B1 (es) |
JP (1) | JP3935544B2 (es) |
KR (1) | KR100492678B1 (es) |
AT (1) | ATE235670T1 (es) |
BR (1) | BR9700912A (es) |
DE (1) | DE69720089T2 (es) |
EA (1) | EA000324B1 (es) |
ES (1) | ES2196203T3 (es) |
IL (1) | IL120103A (es) |
IT (1) | IT1282015B1 (es) |
TR (1) | TR199700089A2 (es) |
ZA (1) | ZA97904B (es) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8065949B1 (en) | 2006-05-24 | 2011-11-29 | Remington Arms Company, Inc. | Gas-operated firearm |
US8109194B2 (en) | 2009-03-20 | 2012-02-07 | Ra Brands, L.L.C. | Clamped gas block for barrel |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1311772B1 (it) * | 1999-12-10 | 2002-03-19 | Beretta Armi Spa | Fucile con presa gas perfezionato. |
US6634274B1 (en) * | 2000-12-11 | 2003-10-21 | Geoffrey Andrew Herring | Firearm upper receiver assembly with ammunition belt feeding capability |
IT1319535B1 (it) | 2000-12-14 | 2003-10-20 | Benelli Armi Spa | Arma da fuoco a ripetizione |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3125930A (en) * | 1964-03-24 | x x x s s | ||
CH19463A (de) * | 1899-05-29 | 1900-07-31 | Mannlicher Ferdinand Ritter Vo | Automatische Feuerwaffe |
FR390196A (fr) * | 1908-05-13 | 1908-09-28 | The Mcclean Arms & Ordnance Company | Perfectionnements apportés aux canons automatiques se chargeant par la culasse et actionnés par les gaz |
US1388856A (en) * | 1917-07-30 | 1921-08-30 | Ansley H Fox Company | Machine-gun |
CH89832A (de) * | 1917-11-10 | 1921-07-01 | Johannes Roethlisberger | Riegelantriebvorrichtung an Selbstladern mit Geradezugverschluss. |
US2144241A (en) * | 1936-06-01 | 1939-01-17 | Eiane Halvor Olsen | Automatic rifle |
FR1130035A (fr) * | 1955-04-25 | 1957-01-30 | Perfectionnements aux fusils de chasse à répétition automatique | |
NL132548C (es) * | 1964-03-20 | |||
US4015512A (en) * | 1974-10-29 | 1977-04-05 | Feerick Jay J | Gas-operated firearm |
US4102242A (en) * | 1975-08-04 | 1978-07-25 | O. F. Mossberg & Sons, Inc. | Autoloading gas-operated firearm |
US4270437A (en) * | 1977-09-01 | 1981-06-02 | Donovan John S | Gas operated automatic weapon |
-
1996
- 1996-02-08 IT IT96MI000229A patent/IT1282015B1/it active IP Right Grant
-
1997
- 1997-01-29 DE DE69720089T patent/DE69720089T2/de not_active Expired - Lifetime
- 1997-01-29 EP EP97101318A patent/EP0789217B1/en not_active Expired - Lifetime
- 1997-01-29 AT AT97101318T patent/ATE235670T1/de active
- 1997-01-29 ES ES97101318T patent/ES2196203T3/es not_active Expired - Lifetime
- 1997-01-30 IL IL12010397A patent/IL120103A/xx not_active IP Right Cessation
- 1997-02-04 KR KR1019970003346A patent/KR100492678B1/ko not_active IP Right Cessation
- 1997-02-04 ZA ZA9700904A patent/ZA97904B/xx unknown
- 1997-02-05 TR TR97/00089A patent/TR199700089A2/xx unknown
- 1997-02-06 BR BR9700912A patent/BR9700912A/pt not_active IP Right Cessation
- 1997-02-07 JP JP02467397A patent/JP3935544B2/ja not_active Expired - Fee Related
- 1997-02-07 EA EA199700017A patent/EA000324B1/ru not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8065949B1 (en) | 2006-05-24 | 2011-11-29 | Remington Arms Company, Inc. | Gas-operated firearm |
US8109194B2 (en) | 2009-03-20 | 2012-02-07 | Ra Brands, L.L.C. | Clamped gas block for barrel |
Also Published As
Publication number | Publication date |
---|---|
IL120103A (en) | 2001-03-19 |
KR970062646A (ko) | 1997-09-12 |
IL120103A0 (en) | 1997-04-15 |
DE69720089D1 (de) | 2003-04-30 |
TR199700089A2 (tr) | 1997-08-21 |
JPH09217998A (ja) | 1997-08-19 |
ITMI960229A1 (it) | 1997-08-08 |
ATE235670T1 (de) | 2003-04-15 |
ITMI960229A0 (es) | 1996-02-08 |
KR100492678B1 (ko) | 2005-08-17 |
ES2196203T3 (es) | 2003-12-16 |
BR9700912A (pt) | 1998-09-01 |
DE69720089T2 (de) | 2003-11-27 |
JP3935544B2 (ja) | 2007-06-27 |
ZA97904B (en) | 1997-08-01 |
EA000324B1 (ru) | 1999-04-29 |
EP0789217A1 (en) | 1997-08-13 |
EA199700017A1 (ru) | 1997-09-30 |
IT1282015B1 (it) | 1998-03-06 |
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