Automatic gas powered gun

Abstract

A gas powered gun is disclosed for repeated discharge of projectiles. The gun includes a barrel adapted to receive a projectile from a magazine, a pressure chamber adapted to communicate with a compressed gas cartridge fitted to the gun, an open-close valve for exhausting compressed gas from said chamber to discharge a projectile in the barrel, and a hammer arranged to actuate the open-close valve. The gun further includes a chamber for collecting partly expanded compressed gas after the gas has been used to discharge the projectile, a piston arranged in a housing and being mechanically connected to the hammer, and a channel for directing the partly expanded gas into the housing, so that the gas will force said piston to move, thereby bringing the hammer to a ready-for-fire-position.

1 . A gas powered gun for repeated discharge of projectiles, comprising: 
 a barrel adapted to receive a projectile from a magazine,    a pressure chamber adapted to communicate with a compressed gas cartridge fitted to the gun,    an open-close valve for exhausting compressed gas from said chamber to discharge a projectile in the barrel, and    a hammer arranged to actuate said open-close valve,    a chamber for collecting partly expanded compressed gas after said gas has been used to discharge said projectile,    a piston arranged in a housing and being mechanically connected to said hammer, and    a channel for directing said partly expanded gas into said housing, so that said gas will force said piston to move, thereby bringing said hammer to a ready-to-fire-position.    
   
   
       2 . A gas powered gun according to  claim 1 , wherein said piston is biased against the pressure of said gas by a biasing device, so that, after being forced back by the pressure of the partly expanded gas, the piston returns to its initial position by the force of said biasing device.  
   
   
       3 . A gas powered gun according to  claim 1 , wherein the piston is connected to the hammer uni-directionally, so that the hammer, after being brought to a ready-to-fire-position by the piston, is held in this position by a catch.  
   
   
       4 . A gas powered gun according to  claim 1 , wherein said gun further comprises a feeder pin adapted to feed a projectile from said magazine into the barrel, and wherein said piston is also mechanically connected to said feeder pin, so that, when said gas forces said piston to move, said feeder pin will be returned to a reload position.  
   
   
       5 . A gas powered gun according to  claim 4 , wherein said piston is biased against the pressure of said gas by a biasing device, so that, after being forced back by the pressure of the partly expanded gas, the piston returns to its initial position by the force of said biasing device and wherein said biasing device is arranged in contact with said feeder pin.  
   
   
       6 . A gas powered gun according to  claim 4 , wherein said piston is mechanically connected to the feeder pin in such a way that the movement of the feeder pin and the piston, in the longitudinal direction of the gun, are synchronized.  
   
   
       7 . A gas powered gun according to  claim 1 , wherein said piston and said housing are aligned essentially in parallel with said barrel.  
   
   
       8 . A gas powered gun according to  claim 7 , wherein said piston is arranged coaxially around said barrel.