Fire arm casing and method for manufacturing

Abstract

This invention relates to a cartridge casing that has a substantially hemispherical end that integrally mates to a welded conforming base that stores a primer. One or more holes in the hemispherical end of the upper chamber aligns with a corresponding hole in the base having a lower pocket to allow primer gasses into the shell casing. The configuration of the base, in combination with upper chamber's distal end hemispherical concavity, removes from the prior art a nipple attachment to the upper chamber and sharp corners in the casing that allow for greater reliability in the integrity in the firing of the bullet, as well as the potential for a greater explosive effect due to a shorter passage to ignite the gun powder more uniformly by the primer source.

We claim: 
     
         1 . A cartridge casing comprising: a substantially concave portion of an upper chamber bonded to a base for minimal separation between the upper chamber, having a concavity at its distal end, and a lower pocket within a lower base, for containing an explosive primer, such that an opening in the concave portion of the upper chamber aligns with a corresponding opening in the lower base to allow passage of the primer's gasses, wherein the upper chamber concavity provides for increased reliability of the base against fracture or deformation. 
     
     
         2 . A cartridge casing comprising: a hemispherical concave distal end of an upper chamber integrally welded to a conformable base to establish a minimal separation between the upper chamber and a lower pocket within the base for contain an explosive primer, such that a hole in the hemispherical end of the upper chamber aligns with a corresponding hole to the lower pocket to allow the primer's gasses into the upper chamber. 
     
     
         3 . A method for assembling a cartridge casing comprising: (a) welding a hemispherical concave end of an upper chamber to a base conformable to the upper chamber; (b) establishing a minimal separation between the upper chamber and a lower pocket; (c) containing an explosive primer in the lower pocket; (d) creating a hole in the hemispherical concave end of the upper chamber; (e) creating a hole in the lower pocket; (f) aligning the hole in the hemispherical concave end with the corresponding hole in the lower pocket; wherein the upper chamber hemispherical concavity provides for: (1) increasing the volume of the casing, which stores gunpowder, (2) increasing reliability of the base against fracture or deformation, (3) allowing the cartridge to be reloaded. 
     
     
         4 . The cartridge casing of  claim 1  wherein the a hemispherical concave end conforms to the base to establish a minimal separation between the upper chamber and the base. 
     
     
         5 . The cartridge casing of  claim 1  wherein a hemispherical concave end is welded to a base to establish a minimal separation between the upper chamber and the base. 
     
     
         6 . The cartridge casing of  claim 1  wherein an upper chamber hemispherical concavity provides for an increase in the volume of the casing to store gunpowder. 
     
     
         7 . The cartridge casing of  claim 1  wherein an upper chamber hemispherical concavity allows the cartridge to be reloaded. 
     
     
         8 . The cartridge casing of  claim 1  wherein a hemispherical concave end is welded to a base to allow the cartridge to be reloaded. 
     
     
         9 . The cartridge casing of  claim 1  wherein a greater explosive effect of a primer to ignite the gun powder is due to a shorter passage between the upper chamber and the base. 
     
     
         10 . The cartridge casing of  claim 1  wherein a greater explosive effect of the gunpowder is due to an increased amount of gunpowder in the upper chamber as a result of having an increased length due to the shorter passage between the upper chamber and the base.