EP0738864A1 - Fusil de chasse actionné par deux masses à inertie cylindriques glissant le long du magasin tubulaire - Google Patents

Fusil de chasse actionné par deux masses à inertie cylindriques glissant le long du magasin tubulaire Download PDF

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Publication number
EP0738864A1
EP0738864A1 EP96830225A EP96830225A EP0738864A1 EP 0738864 A1 EP0738864 A1 EP 0738864A1 EP 96830225 A EP96830225 A EP 96830225A EP 96830225 A EP96830225 A EP 96830225A EP 0738864 A1 EP0738864 A1 EP 0738864A1
Authority
EP
European Patent Office
Prior art keywords
breech
shotgun
block
mass
lever
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Withdrawn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
EP96830225A
Other languages
German (de)
English (en)
Inventor
Salvatore Tedde
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 EP0738864A1 publication Critical patent/EP0738864A1/fr
Withdrawn legal-status Critical Current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
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/02—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated
    • F41A5/10—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight, e.g. for storing energy
    • 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
    • F41A5/02—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated
    • F41A5/10—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight, e.g. for storing energy
    • F41A5/12—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight, e.g. for storing energy mounted in a gun having a fixed barrel

Definitions

  • the present invention relates to the fire-arms for hunting, sport and defence, particularly to portable fire-arms such as the versatile 12-gauge shotguns, and provides an automatic device for controlling the breech-block so as to anticipate or to delay the opening of the latter as a function of the power of the used cartridge, to the safety of the shot.
  • the release of the breech-block which is the mechanical member capable of steadily closing the breech, should always be carried out at a proper moment, i.e. in that very instant in which the pressure in the barrel decreases to the safety level, i.e. neither earlier nor later, on pain of a wrong functioning.
  • a first object of the present invention is that of overcoming the problems mentioned above and providing a device capable of dynamically controlling the release of the breech-block as a function of the recoil energy, which is different according to the power of the used munitions.
  • Another object of the present invention is that of providing a device controlling the breech-block and capable of anticipating or delaying the closure of the latter as a function of the used cartridges.
  • Still another object of the present invention is that of providing a device controlling the breech-block of the above-mentioned type which does not need any cleaning operation otherwise necessary against deposits due to external factors.
  • a device controlling the release of the breech-block of the shotgun comprising two lined up, cylindrical, inertial masses slidable along the tubular magazine located under the barrel, one of which is pivotally connected to a first class lever acting on the breech-block, the other one is capable of moving said first class lever to release the breech-block, said inertial masses being lined up to an elastic member or counter spring which is capable of delaying the release of said breech-block.
  • the operation principle is based upon the fact that in case of fire-arms the burned gases push at the shot to opposite directions, on one side, the bullet and, on the other side, the arm which then gains a speed (recoil) and consequently a kinetic energy, the recoil speed being only a fraction of the instant speed of the bullet which is equal to the reverse ratio between the respective masses.
  • the two cylindrical masses which are free to slide with respect to each other and to the shotgun tend to keep still because of inertia upon recoiling of the arm. Therefore, both cylindrical masses move with respect to the shotgun during the recoil step.
  • the displacement of the first cylindrical mass contacting the spring will be more or less extensive depending on the recoil energy as the inertia of such mass is capable of either compressing the spring more or less strongly or not at all. Accordingly, the displacement of the second cylindrical mass in order to drive the breech-block control lever pivotally connected to the first mass is depending on the recoil energy and then the power of the used cartridge.
  • the inventive step is that of extending the displacement of the first cylindrical mass by shifting the second mass according to the recoil energy in order to differentiate the breech-block controlling times.
  • the breech-block control device essentially includes a first hollow metal cylinder 10 which is slidable coaxially to tubular magazine 12 located under the barrel, a second cylinder 14 having the same mass as the first one and located in a forward position, i.e. further off the shotgun butt.
  • a first class lever 18 is pivotally connected to tailpiece 16 of such second cylinder having a smaller section, and a large spring 20 which can be suitably calibrated is located before the second cylinder and may be compressed against a solid member 21 integral with the shotgun.
  • Tailpiece 16 of cylinder 14 can be received by a housing 22 formed at the end of cylinder 10 facing cylinder 14. Such end of cylinder 10 is bevelled at the upper side with respect to the lower side engaging the lower arm 18b of lever 18. The upper arm 18a of lever 18 controls the opening of the breech-block through a rod 24.
  • the bullet having a total mass of about 32 grams and the arm about 3500 grams, with the barrel being about 600 mm long.
  • the energy of the main recoil due to the bullet which is shot and is still advancing along the barrel, involves the gun as a whole and is about 1/110 of the bullet energy.
  • Cylinder 10 takes on a forward motion by 4 mm with respect to the shotgun (Fig. 4), thus causing a strong thrust against the lower arm 18b of lever 18. The latter rotates anticlockwise and causes rod 24 controlling the breech-block to shift by about 10 mm with the result of a breech-block release.
  • the bullet has travelled along the barrel of the shotgun by a length of about 437 mm which is equal to 110 times the travel of cylinder 10, i.e. the recoil travel.
  • the bullet is then near the muzzle, and the inner pressure of the barrel is already decreased to the safety level.
  • cylinder 14 when firing a light cartridge, cylinder 14 does not take on any travel motion relative to the shotgun as its inertia is not sufficient to overcome the force opposed by spring 20. Cylinder 14 then recoils integrally with the shotgun.
  • the second cylinder 14 acts, in case of firing rather heavy cartridges such as 12 Magnum, as follows: because of the high kinetic energy of the bullet as well as the resulting speed and the recoil energy, when the gun recoils against both lined up cylinders the latter take on a travel motion relative to the shotgun which causes them to overcome the force of counter spring 20 which is compressed with a maximum travel of 7 mm, as shown in Fig. 6. Cylinder 10 collides with lever 18 of cylinder 14 only in the last 4 mm travel and causes the latter to rotate and then rod 24 to shift and to release the breech-block.
  • the release of the breech-block is delayed by the time in which the bullet has travelled along the barrel by about 437 mm.
  • the latter length corresponds to about 62 times the travel of both cylinders (i.e. the recoil travel) which in this case is the maximum travel.
  • the bullet is near the muzzle when the pressure inside the barrel is decreased to a safety level. That is the time to release the breech-block which springs up backwards and automatically performs its residual functions.
  • the shotgun recoils against both cylinders 10 and 14 as in the former case because of the moderate supplied energy, however, the cylinders travel after each other by an intermediate length of 5,5 mm (Fig. 5) and compress spring 20, thus delaying the release of the breech-block to a lower extent than the former case.
  • the opening of the breech-block is dynamically related to the supplied energy.
  • the bullet has travelled along the barrel by a length of about 437 mm, which corresponds to about 80 times the travel of the cylinders (recoil travel) when the pressure inside the barrel is about to go down as in the former case.
  • a further advantageous feature of the invention is that the steady closure of the breech is ensured under any operation condition and by any 12-gauge munitioning, since the compression of spring 20 is as greater as higher the initial momentum of bullet.
  • the opening of the breech above all by using heavy cartridges, can only be carried out after spring 20 is duly compressed, i.e. when the pressure inside the barrel is about to go down.
  • Another advantageous feature of the invention is that it is not necessary to use a specific breech-block as the state of art makes use of suitable members capable of being controlled by the described device.
  • the cylinders may be suitably lightened by drilling radial holes so as to change the weight ratios and to achieve an inertia capable of differently resist to the force of the spring to specifically fit the used cartridge.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Telescopes (AREA)
  • Toys (AREA)
EP96830225A 1995-04-20 1996-04-19 Fusil de chasse actionné par deux masses à inertie cylindriques glissant le long du magasin tubulaire Withdrawn EP0738864A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1995RM000253A IT1306600B1 (it) 1995-04-20 1995-04-20 Fucile calibro 12 e simili con funzionamento determinato tramitedue masse inerziali cilindriche scorrevoli lungo il tubo del
ITRM950253 1995-04-20

Publications (1)

Publication Number Publication Date
EP0738864A1 true EP0738864A1 (fr) 1996-10-23

Family

ID=11403301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830225A Withdrawn EP0738864A1 (fr) 1995-04-20 1996-04-19 Fusil de chasse actionné par deux masses à inertie cylindriques glissant le long du magasin tubulaire

Country Status (2)

Country Link
EP (1) EP0738864A1 (fr)
IT (1) IT1306600B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065195A2 (fr) * 2000-03-02 2001-09-07 Vader Pty Ltd Recoil control mechanism for a weapon
EP1342974A1 (fr) * 2002-03-05 2003-09-10 Fabarm Fabbrica Bresciana Armi S.p.A. Dispositif de charge pour une arme automatique ou semiautomatique avec operation cinétique ou inértiale
AU2001267128B2 (en) * 2000-03-02 2005-10-27 Vader Pty Ltd Recoil control mechanism for a weapon
US10782082B2 (en) 2017-10-20 2020-09-22 Sturm, Ruger & Company, Inc. Bolt assembly for blowback type firearms

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR473402A (fr) * 1913-06-17 1915-01-12 James Eastwick Arme à feu portative automatique
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms
GB645416A (en) * 1947-12-11 1950-11-01 Arnold Louis Chevallier Improvements in automatic small arms
FR2131102A5 (fr) * 1971-03-25 1972-11-10 Bretton Rene
US4102242A (en) * 1975-08-04 1978-07-25 O. F. Mossberg & Sons, Inc. Autoloading gas-operated firearm
US4505183A (en) * 1982-12-02 1985-03-19 O. F. Mossberg & Sons, Inc. Gas actuated operating mechanism for autoloading firearm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR473402A (fr) * 1913-06-17 1915-01-12 James Eastwick Arme à feu portative automatique
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms
GB645416A (en) * 1947-12-11 1950-11-01 Arnold Louis Chevallier Improvements in automatic small arms
FR2131102A5 (fr) * 1971-03-25 1972-11-10 Bretton Rene
US4102242A (en) * 1975-08-04 1978-07-25 O. F. Mossberg & Sons, Inc. Autoloading gas-operated firearm
US4505183A (en) * 1982-12-02 1985-03-19 O. F. Mossberg & Sons, Inc. Gas actuated operating mechanism for autoloading firearm

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065195A2 (fr) * 2000-03-02 2001-09-07 Vader Pty Ltd Recoil control mechanism for a weapon
WO2001065195A3 (fr) * 2000-03-02 2003-02-27 Vader Pty Ltd Recoil control mechanism for a weapon
US6761102B2 (en) 2000-03-02 2004-07-13 Vader Pty Ltd Recoil control mechanism for a weapon
AU2001267128B2 (en) * 2000-03-02 2005-10-27 Vader Pty Ltd Recoil control mechanism for a weapon
CN100339676C (zh) * 2000-03-02 2007-09-26 瓦德尔私营有限公司 武器的后座力控制装置
EP1342974A1 (fr) * 2002-03-05 2003-09-10 Fabarm Fabbrica Bresciana Armi S.p.A. Dispositif de charge pour une arme automatique ou semiautomatique avec operation cinétique ou inértiale
US10782082B2 (en) 2017-10-20 2020-09-22 Sturm, Ruger & Company, Inc. Bolt assembly for blowback type firearms

Also Published As

Publication number Publication date
ITRM950253A1 (it) 1995-07-20
ITRM950253A0 (it) 1995-04-20
IT1306600B1 (it) 2001-06-18

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