Shotgun cartridge obturator, method for preparing a cartridge equipped with said obturator and equipped cartridge

Abstract

The invention relates to a shotgun cartridge comprising a case (12) of internal diameter dINT and a base (14) with a primer (16), the powder (18), a wad (22) and the shot (24), as well as an obturator (20) arranged between the powder (18) and the wad (22), characterized in that the obturator (20) is made of biodegradable material with plastic deformation properties, and comprises a central disk (25) and ribs (26) together forming a one-piece element with the disk, the assembly having an outer diameter dEXT, the ribs (26) comprising upper ribs (27) and lower ribs (28), these ribs (26) forming a non-zero angle with the plane of the disk (25), the obturator having a nominal outer diameter dEXT, the ribs being able to take at least one other position in which said ribs (26) are in the plane of the disk (25), the outer diameter being DEXT. The invention also concerns a method for producing a shotgun cartridge.

1 . Shotgun cartridge comprising a case ( 12 ) of internal diameter d INT  and a base ( 14 ) with a primer ( 16 ), the powder ( 18 ), a wad ( 22 ) and the shot ( 24 ), as well as an obturator ( 20 ) arranged between the powder ( 18 ) and the wad ( 22 ), characterized in that the obturator ( 20 ) is made of biodegradable material with plastic deformation properties, and comprises a central disk ( 25 ) and ribs ( 26 ) together forming a one-piece element with the disk, the assembly having an outer diameter d EXT , the ribs ( 26 ) comprising upper ribs ( 27 ) and lower ribs ( 28 ), these ribs ( 26 ) forming a non-zero angle with the plane of the disk ( 25 ), the obturator having a nominal outer diameter d EXT , the ribs being able to take at least one other position in which said ribs ( 26 ) are in the plane of the disk ( 25 ), the outer diameter being D EXT . 
     
     
         2 . Shotgun cartridge according to  claim 1 , characterized in that the diameter D EXT  of the obturator ( 20 ) with the ribs in the plane of the disk ( 25 ) is greater than the inner diameter d INT  of the case. 
     
     
         3 . Shotgun cartridge according to  claim 1 , characterized in that the nominal outer diameter d EXT  of the obturator ( 20 ) is less than the inner diameter d INT  of the case ( 12 ). 
     
     
         4 . Shotgun cartridge according to  claim 1 , characterized in that the obturator comprises a linking membrane ( 38 ) between the ribs ( 26 ). 
     
     
         5 . Shotgun cartridge according to  claim 1 , characterized in that the obturator ( 20 ) comprises eight upper ribs ( 27 ) and eight lower ribs ( 28 ). 
     
     
         6 . Shotgun cartridge according to  claim 1 , characterized in that the upper ribs ( 27 ) and the lower ribs ( 28 ) comprise two radial rectilinear edges ( 30 ) and a circular edge ( 32 ) forming the periphery of the obturator ( 20 ) with an upper circular edge ( 34 ) and a lower circular edge ( 36 ). 
     
     
         7 . Shotgun cartridge according to  claim 6 , characterized in that the radial rectilinear edges ( 30 ) of the upper ribs ( 27 ) are staggered relative to the lower ribs ( 28 ). 
     
     
         8 . Shotgun cartridge according to  claim 1 , characterized in that the upper ribs ( 27 ) form an angle of more than 0° and in that the lower ribs ( 28 ) form an angle of less than 0°, with the plane of the central disk ( 25 ). 
     
     
         9 . Shotgun cartridge according to  claim 8 , characterized in that the upper ribs ( 27 ) form an angle of about 30° and in that the lower ribs ( 28 ) form an angle of about −30°, with the plane of the central disk ( 25 ). 
     
     
         10 . Method for producing a shotgun cartridge according to  claim 1 , characterized in that it comprises the following steps:
 preparing a base ( 14 ) with the case thereof ( 12 ), said base comprising a primer ( 16 ) and a powder charge ( 18 ),   introducing an obturator ( 20 ) into the case ( 12 ),   introducing at least one wad ( 22 ) into said case ( 12 ),   introducing the projectile ( 24 ) into said case ( 12 ),   crimping the case ( 12 ).