9.3 mm Blank cartridge and chamber

Abstract

A chamber and blank cartridge of specific dimensions for safer use in simulated firearms. The dimensions of the chamber make it incompatible for use with known lethal cartridges. The dimensions of the blank cartridge make it incompatible with the chambers of actual firearms. This prevents the inadvertent loading of lethal or blank cartridges. Upon discharge the blank cartridge and chamber release exhaust gases in a forward direction. This effect is similar to an actual firearm and so generates realistic visual and auditory effects. The blank cartridge has a nose which may increase propellant capacity. The use of additional propellant will generate greater energy for visual and auditory effects. This will also improves the cycling of actions of larger simulated automatic firearms. The shape of the nose also improves magazine feeding in automatic simulated firearms.

1 . A chamber for a blank cartridge for use in simulated firearms, comprising a chamber base, a neck, and said chamber having the following dimensions  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 diameter of said chamber base at the 
                 about 10.0 mm 
               
                   
                 commencement of said chamber base 
               
                   
                 length of said chamber base 
                 about 19.4 mm 
               
                   
                 diameter of said chamber neck 
                  about 8.4 mm 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
             
          
         
       
     
   
   
       2 . A blank cartridge, comprising a base, a case wall extending from said base, with said case wall having a diameter with a reverse taper, a case shoulder at the end of said case wall, and a nose extending from the case shoulder and enclosing the blank cartridge; and said blank cartridge having the following dimensions:  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 diameter of said base 
                 about 9.6 mm 
               
                   
                 diameter of said case wall at the juncture of 
                 about 9.3 mm 
               
                   
                 said case wall and said case shoulder 
               
                   
                 diameter of said case shoulder 
                 about 8.2 mm 
               
                   
                 length from said base to said case shoulder 
                 about 19.0 mm  
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
             
          
         
       
     
   
   
       3 . A cartridge as defined in  claim 2 , wherein said blank cartridge having a primer.  
   
   
       4 . A cartridge as defined in  claim 2 , wherein said blank cartridge containing propellant.  
   
   
       5 . A cartridge as defined in  claim 2 , wherein said blank cartridge having a primer and containing propellant.  
   
   
       6 . A cartridge as defined in  claim 2 , wherein said case shoulder having a diameter of less than 8.2 mm.  
   
   
       7 . A cartridge as defined in  claim 6 , wherein said blank cartridge having a primer.  
   
   
       8 . A cartridge as defined in  claim 6 , wherein said blank cartridge containing propellant.  
   
   
       9 . A cartridge as defined in  claim 6 , wherein said blank cartridge having a primer and containing propellant.