Cartridge

Abstract

The invention refers to a cartridge ( 1 ) adapted for insertion into a cartridge-seat that communicates with a low-pressure chamber, the cartridge by itself operating as a high-pressure chamber through the provision of a separate insert formed with a constriction that delays the flow of combustion gases into the low-pressure chamber. The insert is formed for insertion into the cartridge by the use of conventional reloading tools.

1 . A cartridge ( 1 ) operative for expulsion of a projectile from a reusable shell case formed with a cartridge-seat ( 4 ) that is connected with a low-pressure chamber ( 6 ) via an opening (I) through a front wall ( 5 ) of the cartridge-seat, the cartridge having a primer ( 2 ) and containing a propellant charge ( 3 ) in a cylindrical container that is dimensioned to be form-fitted into the cartridge-seat, characterized by a separate insert ( 7 ) inserted in a front end portion of the cartridge, the insert ( 7 ) having a passage ( 8 ) going there through operating as a constriction for combustion gases flowing into the low-pressure chamber, the insert having a forward shoulder ( 10 ) that is forced into sealing contact with the front wall ( 5 ) of the cartridge-seat upon ignition of the propellant charge, thus preventing combustions gases from leaking over the envelope surface of the insert ( 7 ).  
   
   
       2 . The cartridge of  claim 1 , wherein the insert ( 7 ) has a cylindrical portion ( 9 ) insertable into the forward end of the cartridge, the outer diameter of said portion ( 9 ) sealing against the cartridge, and a cylindrical portion ( 11 ) protruding there from and dimensioned to be received in the opening (I) through the wall ( 5 ) of the cartridge-seat, a shoulder ( 10 ) radially extended between the two portions ( 9  and  11 ), and an axial passage ( 8 ) going there through, the diameter of which is dimensioned for delaying the exiting combustion gases.  
   
   
       3 . The cartridge of  claim 1 , wherein the insert is formed from a material of less hardness than the cartridge-seat to be deformable for sealing contact with the forward wall ( 5 ) of the cartridge-seat.  
   
   
       4 . The cartridge of  claim 3 , wherein the insert is made of copper, copper alloy, aluminum or other light metal.  
   
   
       5 . The cartridge of  claim 1 , wherein a membrane ( 12 ) is attached to an inner end of the insert ( 7 ), sealing the passage ( 8 ).  
   
   
       6 . The cartridge of  claim 1 , characterized in that the insert ( 7 ) initially is depressed into the cartridge ( 1 ) only to a depth that gives the cartridge an oversized axial length with respect to the cartridge-seat ( 4 ).  
   
   
       7 . The cartridge of  claim 2 , wherein a membrane ( 12 ) is attached to an inner end of the insert ( 7 ), sealing the passage ( 8 ).  
   
   
       8 . The cartridge of  claim 3 , wherein a membrane ( 12 ) is attached to an inner end of the insert ( 7 ), sealing the passage ( 8 ).  
   
   
       9 . The cartridge of  claim 4 , wherein a membrane ( 12 ) is attached to an inner end of the insert ( 7 ), sealing the passage ( 8 ).  
   
   
       10 . The cartridge of  claim 2 , characterized in that the insert ( 7 ) initially is depressed into the cartridge ( 1 ) only to a depth that gives the cartridge an oversized axial length with respect to the cartridge-seat ( 4 ).  
   
   
       11 . The cartridge of  claim 3 , characterized in that the insert ( 7 ) initially is depressed into the cartridge ( 1 ) only to a depth that gives the cartridge an oversized axial length with respect to the cartridge-seat ( 4 ).  
   
   
       12 . The cartridge of  claim 4 , characterized in that the insert ( 7 ) initially is depressed into the cartridge ( 1 ) only to a depth that gives the cartridge an oversized axial length with respect to the cartridge-seat ( 4 ).  
   
   
       13 . The cartridge of  claim 5 , characterized in that the insert ( 7 ) initially is depressed into the cartridge ( 1 ) only to a depth that gives the cartridge an oversized axial length with respect to the cartridge-seat ( 4 ).