Abstract:
A paintball gun is to directly shoot a paintball by using pressurized air to avoid the fast movement of a hammer protruding from a barrel from hurting the hand of a user. A low-pressure regulator is turned to block a port of the barrel to prevent the pressurized air from entering into the barrel to avoid hurting people by accidentally pulling the trigger.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     (a) Field of the Invention  
         [0002]     The present invention relates to a paintball gun, and more particularly, to one that applies pressurized air to directly fire a paintball, having the pressurized air passing through a spool, an opening and a through hole of a piston, and has a port blocked by turning a low-pressure regulator to avoid hurting people by accidentally pulling a trigger.  
         [0003]     (b) Description of the Prior Art  
         [0004]     Survival game in jungle is quite popular sport, and a use of a paintball gun is the essence in the game. To mitigate the risks of using the paintball gun, a flask filled with pressurized air is essentially used as the motive power to shoot the paintball gun. As illustrated in  FIG. 5  of the accompanying drawings, the paintball is fired by having provided a drop hole (A 2 ) provided on the tip of a barrel (A 1 ) of a paintball gun (A) to permit a paintball (B) to automatically drop into the barrel (A 1 ). When a trigger (A 3 ) is pulled, a hammer (A 4 ) linked to the trigger (A 3 ) drives a bolt (A 5 ) to fire the paintball (B). A slot (A 6 ) is provided at the terminal of the barrel (A 1 ) for a connecting pin (A 7 ) disposed between the hammer (A 4 ) and the bolt (A 5 ) to move and pass through. However, the connecting pin (A 7 ) moves very quickly at the moment the paintball (B) is fired and the top of the connecting pin (A 7 ) sticks out of the barrel (A 1 ); therefore the protruding end of the connecting pin (A 7 ) and the end of the bolt (A 5 ) could easily hurt the hand of the user. Furthermore, the entire firing installation is not provided any protection from elements encountered adverse in playing conditions. The paintball gun can be easily fired by accidentally pulling the trigger to hurt people. Being exposed to such risk, the shooting fun is often frustrated during the game.  
       SUMMARY OF THE INVENTION  
       [0005]     The primary purpose of the present invention is to provide a paintball gun that applies pressurized air to directly fire the paintball. To achieve the purpose, a T-valve is provided in a frame of the paintball gun to control the passage of low-pressure air; a spool is also provided in a barrel of the frame with an opening disposed at its front end and a piston is inserted into the opening; a spring is provided between the piston and the spool, both the piston and the spool are each provided with a through hole connecting to their respective outer edges; a through channel is disposed at the terminal of the spool; and a low-pressure regulator is provided in an air storage chamber and adapted with a block. When the trigger is pulled, the T-valve admits the low-pressure air to enter into the through channel to push the piston and to advance the paintball while the pressurized air passes from the air storage chamber in sequence through the port, the spool, the opening and the through hole of the piston to fire the paintball. By having the pressurized air to directly fire the paintball, there would be no fast move by the hammer protruding out of the barrel, thus there is not chance that the hand of the user to get hurt. When the low-pressure regulator is turned to block the port, it stops the pressurized air in the air storage chamber from entering into the barrel, thus to prevent accidentally pulling the trigger to hurt somebody.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0006]      FIG. 1  is a cross-sectional view showing a structure of the present invention.  
         [0007]      FIG. 2  is a cross-sectional view showing that a paintball is loaded into the present invention.  
         [0008]      FIG. 3  is a cross-sectional view showing the paintball is fired by pressurized air.  
         [0009]      FIG. 4  is a cross-sectional view showing that a low-pressure regulator is turned to block a port of an air storage chamber;  
         [0010]      FIG. 5  is a cross-sectional view of a striking structure of a prior paintball gun.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0011]     Referring to  FIGS. 1 , and  2 , the present invention essentially comprises a frame ( 1 ), a spool ( 2 ), and a low-pressure regulator ( 3 ). The frame ( 1 ) is provided with a barrel ( 11 ). A paintball drop hole ( 12 ) is disposed at the top side of the barrel ( 11 ). An air storage chamber ( 13 ) is adjacent to the barrel ( 11 ). A port ( 14 ) and a keyhole ( 15 ) are respectively provided in the front section and the rear section between the air storage chamber ( 13 ) and the barrel ( 11 ). The front end of the air storage chamber ( 13 ) is connecting through a pressurized air flask ( 16 ) so to input the pressurized air into the air storage chamber ( 13 ). A trigger ( 17 ) and a T-valve ( 18 ) are connected to the frame ( 1 ). The trigger ( 17 ) controls the operation of the T-valve ( 18 ). The T-valve ( 18 ) is disposed with an air inlet hole ( 181 ) connecting through an air inlet way ( 182 ). Furthermore, an air outlet hole ( 183 ) is provided in the T-valve ( 18 ) to connect through an air outlet way ( 184 ) for allowing low-pressure air to pass through.  
         [0012]     The spool ( 2 ) disposed in the terminal of the barrel ( 11 ) has an opening ( 21 ) at the front edge of the spool ( 2 ). A piston ( 22 ) is inserted into the opening ( 21 ) to block the opening ( 21 ) of the spool ( 2 ). A spring ( 221 ) is disposed between the piston ( 22 ) and the spool ( 2 ). Two through holes ( 23 ), ( 24 ) are respectively provided to the spool ( 2 ) and the piston ( 22 ) to connect through their respective outer edges. A through channel ( 25 ) is disposed at the rear end of the spool ( 2 ) to connect through the lower-pressure air transmitted by the air outlet way ( 184 ).  
         [0013]     The low-pressure regulator ( 3 ) is turned to be disposed at the terminal of the air storage chamber ( 13 ). The low-pressure regulator ( 3 ) has on its circumference provided in recess a groove ( 31 ), and its front end, a block ( 32 ).  
         [0014]     When in use as illustrated in  FIG. 2 , the pressurized air from the pressurized air flask ( 16 ) fills up the air storage chamber ( 13 ) and enters into the spool ( 2 ) through the port ( 14 ). Since the piston ( 22 ) plugs the opening ( 21 ) of the spool ( 2 ), the pressurized air is accumulated inside the spool ( 2 ). Once a paintball (B) falls from the paintball drop hole ( 12 ) into the front edge of the barrel ( 11 ), the trigger ( 17 ) is pulled for the T-valve ( 18 ) to start operating to admit the low-pressure air passes through in sequence from the air inlet way ( 182 ) into the air inlet hole ( 181 ) and outputted through the air outlet hole ( 183 ) to pass through the air outlet way ( 184 ), the groove ( 31 ) of the low-pressure regulator ( 3 ), as illustrated in  FIG. 3 , and finally into the through channel ( 25 ) of the spool ( 2 ). The low-pressure air then starts to push the piston ( 22 ) in the spool ( 2 ) to move forward and compress the spring ( 221 ). As the piston ( 22 ) advances, the paintball (B) is pushed to the battery position while the piston ( 22 ) is cleared of the opening ( 21 ). The pressurized air accumulated in the spool ( 2 ) is discharged at high speed from the opening ( 21 ) and ejected from the through hole ( 24 ) of the piston ( 22 ) to shoot the paintball (B) by the impetus from the pressurized air. After having shot the paintball (B) by the pressurized air, the piston ( 22 ) is pushed back to its original position thanks to the return force executed by the spring ( 221 ) to plug the opening ( 21 ) once again until the next shot.  
         [0015]     To avoid pulling the trigger ( 17 ) by accident, the low-pressure regulator ( 3 ) is turned, as illustrated in  FIG. 4 , for the block ( 32 ) disposed at the front end of the low-pressure regulator ( 3 ) to move inside the air storage chamber ( 13 ) thus to plug the port ( 14 ) to stop the pressurized air in the air storage chamber ( 13 ) from entering into the barrel ( 11 ) to shoot the paintball (B) accidentally.