Quick-assembly breech plug for muzzleloader firearms

Abstract

The invention relates to a quick-assembly breech plug for muzzleloader firearms, allowing a quick assembly and disassembly and being extremely practical, simple to manufacture and having a low cost, wherein said breech plug comprises a cylindrical body ( 1 ), configured to be internally coupled in a rear end ( 10 ′) of a barrel ( 10 ), and a head ( 6 ) configured to define a limit coupling position of the breech plug inside the barrel ( 10 ), wherein the cylindrical body ( 1 ) externally comprises a male thread ( 2 ) having at least two starts located close to a front end ( 3 ) of the breech plug, opposite the head ( 6 ), according to a plane perpendicular to an axis of revolution of the cylindrical body ( 1 ), said male thread ( 2 ) being configured to screw into a female thread ( 10 ″) located internally in the rear end ( 10 ′) of the barrel ( 10 ), preferably 4 screw ridges.

1 . Quick-assembly breech plug for muzzleloader firearms, comprising a cylindrical body ( 1 ) configured to be tightly coupled internally in a rear end ( 10 ′) of a barrel ( 10 ), wherein said breech plug comprises a head ( 6 ) configured to define a limit coupling position of the breech plug inside the barrel ( 10 ), characterized in that the cylindrical body ( 1 ) externally comprises a male thread ( 2 ) having at least two starts located close to a front end ( 3 ) of the breech plug, opposite the head ( 6 ), according to a plane perpendicular to an axis of revolution of the cylindrical body ( 1 ), said male thread ( 2 ) being configured to screw into a female thread ( 10 ″) located internally in the rear end ( 10 ′) of the barrel ( 10 ), preferably  4  screw ridges. 
   
   
       2 . Quick-assembly breech plug for muzzleloader firearms according to  claim 1 , characterized in that the front end ( 3 ) of the cylindrical body ( 1 ) comprises an end section without male thread ( 2 ) having at least one perimetric groove ( 4 ) configured to house an O-ring seal ( 5 ) configured to prevent firing gases from escaping through a clearance located between the cylindrical body ( 1 ) and the barrel ( 10 ) when the firearm is fired and the breech plug is coupled in the barrel ( 10 ). 
   
   
       3 . Quick-assembly breech plug for muzzleloader firearms according to  claim 1 , characterized in that the head ( 6 ) comprises a side surface ( 7 ) in which there are located at least one blind hole ( 8 ) and preferably  4  blind orifices, configured to receive a tooth ( 11 ′) comprised by a tool ( 11 ) and receive the transmission of a torque to cause the screwing and/or unscrewing of the breech plug in the barrel ( 10 ) in the event of jamming thereof. 
   
   
       4 . Quick-assembly breech plug for muzzleloader firearms according to  claim 3 , characterized in that the side surface ( 7 ) of the head ( 6 ) is knurled. 
   
   
       5 . Quick-assembly breech plug for muzzleloader firearms according to  claim 1 , characterized in that it comprise an axially centered inner hole ( 9 ) configured to allow the transmission of the ignition of the primer to the charge of the powder ( 10 ).