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US 5,959,234 AGranted
Gas-operated automatic firearm, particularly a shotgun
AssigneeBenelli Armi S.P.A.
InventorsSergio Scaramucci, Rolando Caldari
Life of this patent
Estimating the term…
Abstract
Gas-operated automatic weapon, including a barrel having a cylindrical portion that is blended with a cartridge chamber which can be closed by a breech block, wherein it includes a gas take-off that is located proximate to the cartridge chamber and is suitable to draw a fraction of the gases generated by the cartridge to actuate a piston that is suitable to open the breech block for automatic reloading of the weapon.
Claims4
A gas-operated automatic firearm comprising:
- a barrel having a cylindrical portion and a cartridge chamber connected to one another by a blending cone;
- a breech block connected to said barrel for closing said cartridge chamber;
- a cylinder connected to said barrel and extending substantially parallel thereto;
- a piston at least partially disposed in said cylinder and operatively coupled via a rod to said breech block for opening said breech block to automatically reload the firearm;
- a closure attached to said cylinder, said cylinder and said piston together with said closure defining an expansion chamber;
- gas port means defining at least one gas port extending to said expansion chamber for drawing off a portion of gas generated on discharge of a round in said cartridge chamber, to actuate said piston, said gas port having an inlet portion located along said cylindrical portion and proximate to said cartridge chamber at a distance of less than a length of the blending cone from said blending cone;
- and
- a pressure limiting valve mounted to said closure.
5 more elements
A gas-operated automatic firearm comprising:
- barrel having a cylindrical portion and a cartridge chamber;
- a breech block connected to said barrel for closing said cartridge chamber;
- two cylinders connected to said barrel on opposing sides thereof and extending substantially parallel thereto;
- two pistons each at least partially disposed in a respective one of said cylinders and operatively coupled via a respective rod to said breech block for opening said breech block to automatically reload the firearm;
- two closures each attached to a respective one of said cylinders, each of said cylinders and the respective piston together with the respective closure defining an expansion chamber;
- gas port means located proximately to said cartridge chamber and defining two gas ports each extending to a respective said expansion chamber for drawing off a portion of gas generated on discharge of a round in said cartridge chamber, to actuate said pistons;
- and
- two pressure limiting valves each mounted to a respective one of said closures.
5 more elements
Dependencies are inferred from the claim text.