Gas Powered Gun and a Pressure Tube for a Gas Powered Gun

Abstract

A gas powered gun and a pressure tube for a gas powered gun each comprises a gas regulator between a pressure chamber and a source of compressed gas. The gas regulator comprises a body forming first and second cylindrical portions connected to each other. The first cylindrical portion is in fluid connection with the pressure chamber. A piston is mounted for sliding movement in the first and second cylindrical portions. A valve seat is in the second cylindrical portion. An intermediate chamber is in the second cylindrical portion between the piston and the valve seat and in fluid connection with the source of compressed gas. A passageway through the piston connects the pressure chamber with the intermediate chamber. A biasing member presses the piston resiliently away from the valve seat. A valve seat adjusting mechanism is accessible to a user for adjusting a position of the valve seat.

1 . A gas powered gun comprising:
 a pressure chamber; and   a gas regulator, which is arranged between said pressure chamber and a source of compressed gas;   
       said gas regulator comprising:
 a body, forming a first cylindrical portion and a second cylindrical portion, which are connected to each other, a diameter of said first cylindrical portion being greater than a diameter of said second cylindrical portion, said first cylindrical portion being in fluid connection with said pressure chamber; 
 a piston mounted for sliding movement in said first and said second cylindrical portions; 
 a first sealing member, which seals between a large diameter portion of said piston and said first cylindrical portion; 
 a second sealing member which seals between a small diameter portion of said piston and said second cylindrical portion; 
 a valve seat sealingly arranged in said second cylindrical portion, 
 an intermediate chamber formed in said second cylindrical portion between said piston and said valve seat, said intermediate chamber being in fluid connection with said source of compressed gas; 
 a passageway extending through said piston and connecting said pressure chamber with said intermediate chamber; 
 a biasing member for pressing said piston resiliently away from said valve seat; and 
 a valve seat adjusting mechanism for adjusting a position of the valve seat, wherein said valve seat adjusting mechanism is accessible to a user without removing said regulator from said gas powered gun; 
 
       wherein said piston is subject to a first force created by pressure in said pressure chamber, and a second force created by pressure in said source of compressed gas, and said piston is movable against the action of the biasing member from a first position, in which said piston is separated from said valve seat so that said passageway is open to allow gas to flow from said source of compressed gas via said intermediate chamber into said pressure chamber, to a second position, in which said piston abuts said valve seat so that said passageway is closed, so that, when said piston is in its first position, pressure increases in said pressure chamber until said first force exceeds a sum of said second force and a spring force of said biasing member, to thereby move said piston to its second position, said spring force being dependant on the position of the valve seat. 
     
     
         2 . A gas powered gun according to  claim 1 , wherein said valve seat adjusting mechanism is arranged in said second cylindrical portion. 
     
     
         3 . A gas powered gun according to  claim 1 , wherein said valve pressure adjusting mechanism comprises a threaded portion and said second cylindrical portion comprises a matching threaded portion and said valve pressure adjusting mechanism is adapted to be screwed into and out of said threaded portion in said second cylindrical portion. 
     
     
         4 . A gas powered gun according to  claim 3 , wherein said threaded portion of said valve pressure adjusting mechanism comprises a tool engaging part, which is accessible to a user without removing the regulator from said gas powered gun. 
     
     
         5 . A gas powered gun according to  claim 2 , wherein said valve seat moves to at least a first position when said valve pressure adjusting mechanism is moved in a direction into said second cylinder portion and said valve seat is adapted to move to at least a second position when said valve pressure adjusting mechanism is moved in an opposite direction. 
     
     
         6 . A gas powered gun according to  claim 1 , wherein said valve seat comprises a piston abutting portion and a valve seat adjusting mechanism connection part. 
     
     
         7 . A gas powered gun according to  claim 6 , wherein said piston abutting portion is made of plastic. 
     
     
         8 . A gas powered gun according to  claim 1 , wherein said biasing member is arranged in said first cylindrical portion between said large diameter portion of said piston and an annular portion between said first and said second cylindrical portions. 
     
     
         9 . A gas powered gun according to  claim 1 , wherein said biasing member comprises one or more spring discs. 
     
     
         10 . A gas powered gun according to  claim 1 , wherein said body further comprises an atmospheric passage extending between an opening to the atmosphere and said first and said second cylindrical portions between said first and said second sealing members. 
     
     
         11 . A gas powered gun according to  claim 1 , wherein said source of compressed gas is a bottle or a tube comprising compressed gas. 
     
     
         12 . A gas powered gun according to  claim 1 , wherein said gas powered gun further comprises a barrel adapted to receive a projectile and an open-close valve for exhausting compressed gas from said pressure chamber to discharge a projectile in the barrel. 
     
     
         13 . A pressure tube for a gas powered gun comprising:
 a pressure chamber; and   a gas regulator, which is arranged between said pressure chamber and a source of compressed gas;   
       said gas regulator comprising:
 a body, forming a first cylindrical portion and a second cylindrical portion, which are connected to each other, a diameter of said first cylindrical portion being greater than a diameter of said second cylindrical portion, said first cylindrical portion being in fluid connection with said pressure chamber; 
 a piston mounted for sliding movement in said first and said second cylindrical portions; 
 a first sealing member, which seals between a large diameter portion of said piston and said first cylindrical portion; 
 a second sealing member which seals between a small diameter portion of said piston and said second cylindrical portion; 
 a valve seat sealingly arranged in said second cylindrical portion; 
 an intermediate chamber formed in said second cylindrical portion between said piston and said valve seat, said intermediate chamber being in fluid connection with said source of compressed gas; 
 a passageway extending through said piston and connecting said pressure chamber with said intermediate chamber; 
 a biasing member for pressing said piston resiliently away from said valve seat; and 
 a valve seat adjusting mechanism for adjusting a position of the valve seat, wherein said valve seat adjusting mechanism is accessible to a user without removing said regulator from said pressure tube; 
 
       wherein said piston is subject to a first force created by pressure in said pressure chamber, and a second force created by pressure in said source of compressed gas, and said piston is movable against the action of the biasing member from a first position, in which said piston is separated from said valve seat so that said passageway is open to allow gas to flow from said source of compressed gas via said intermediate chamber into said pressure chamber, to a second position, in which said piston abuts said valve seat so that said passageway is closed, so that, when said piston is in its first position, pressure increases in said pressure chamber until said first force exceeds a sum of said second force and a spring force of said biasing member, to thereby move said piston to its second position, said spring force being dependant on the position of the valve seat. 
     
     
         14 . A pressure tube according to  claim 13 , wherein said valve seat adjusting mechanism is arranged in said second cylindrical portion. 
     
     
         15 . A pressure tube according to  claim 13 , wherein said valve pressure adjusting mechanism comprises a threaded portion and said second cylindrical portion comprises a matching threaded portion and said valve pressure adjusting mechanism is adapted to be screwed into and out of said threaded portion in said second cylindrical portion 
     
     
         16 . A pressure tube according to  claim 15 , wherein said threaded portion of said valve pressure adjusting mechanism comprises a tool engaging part, which is accessible to a user without removing the regulator from said pressure tube. 
     
     
         17 . A pressure tube according to  claim 14 , wherein said valve seat moves to at least a first position when said valve pressure adjusting mechanism is moved in a direction into said second cylinder portion and said valve seat is adaptive to move to at least a second position when said valve pressure adjusting mechanism is moved in an opposite direction. 
     
     
         18 . A pressure tube according to  claim 13 , wherein said valve seat comprises of a piston abutting portion and a valve seat adjusting mechanism connection part. 
     
     
         19 . A pressure tube according to  claim 18 , wherein said piston abutting portion is made of plastic. 
     
     
         20 . A pressure tube according to  claim 13 , wherein:
 said biasing member is arranged in said first cylindrical portion between said large diameter portion of said piston and an annular portion between said first and said second cylindrical portions; and/or   said biasing member comprises one or more spring discs; and/or   said body further comprises an atmospheric passage extending between an opening to the atmosphere and said first and said second cylindrical portions between said first and said second sealing members; and/or   said source of compressed gas is a chamber in said pressure tube.