Air gun having improved firing structure

Abstract

An air gun having an improved firing structure has a gun body. The gun body has a passageway therein. The passageway is formed with a paintball outlet and a paintball inlet. A firing unit is provided in the gun body adjacent to the paintball outlet. The firing unit has a first outer sleeve, a bushing, and an action space defined between the first outer sleeve and the bushing, and communicates with a control unit via a first air flow passage. A gas regulated by a pressure-regulating unit flows into the action space via the first air flow passage, and the control unit controls the compressed gas to move the bolt for completing a firing action.

What is claimed is: 
     
         1 . An air gun having an improved firing structure, comprising a gun body, the gun body including a firing unit and a control unit therein;
 an interior of the gun body having an axial passageway, a front end of the passageway being formed with a paintball outlet and a paintball inlet communicating with the paintball outlet;   the firing unit being located in the passageway and adjacent to the paintball outlet, the firing unit including a first outer sleeve, a bushing, a guide pillar and a bolt, the first outer sleeve being disposed in the passageway, the bushing being disposed in one end of the first outer sleeve adjacent to the paintball outlet, the bolt being slidably sleeved on the guide pillar and located in the bushing, a front end of the bolt extending out of the bushing and being located behind the paintball inlet, the first outer sleeve having at least one first air flow passage communicating with the control unit, an action space communicating with the first air flow passage being formed between an outer periphery of the bushing and the first outer sleeve, a first air flow space being formed between the guide pillar and the first outer sleeve for moving the guide pillar forward and backward, the first air flow space communicating with the control unit via a second air flow passage passing through the first outer sleeve;   wherein, when in use, a compressed gas enters the action space via the first air flow passage, and the control unit controls a gas path of the compressed gas in the firing unit to move the guide pillar backward in the first air flow space for the compressed gas to push the bolt toward the paintball outlet to perform a firing action.   
     
     
         2 . The air gun as claimed in  claim 1 , wherein a rear end of the guide pillar has a first annular step and a second annular step that are in the form of protruding rings, the first annular step has a first rear wall connected to the first outer sleeve through a first elastic member, the first air flow space is formed between the first rear wall and the first outer sleeve for moving the guide pillar forward and backward, the first annular step further has a first front wall adjacent to a rear end edge of the bushing, the second annular step is located on the first front wall, one side of the second annular step, adjacent to the bolt, forms a second front wall, and the first annular step and the second annular step are moved along with the guide pillar for the first front wall of the first annular step to contact or leave the rear end edge of the bushing and for the second front wall of the second annular step to contact or leave the rear end of the bolt. 
     
     
         3 . The air gun as claimed in  claim 2 , wherein a pneumatic space is formed between the bolt and the bushing, the front end of the bolt forms a firing port communicating with an interior of the bolt, a rear end of the bolt has an annular force-receiving portion that is driven by the compressed gas, one side of the force-receiving portion, facing the second annular step, has a first force-receiving surface, another side of the force-receiving portion, facing away from the second annular step, has a second force-receiving surface, when the compressed gas acts on the first force-receiving surface to move the bolt forward, the second force-receiving surface contacts the bushing to complete the firing action. 
     
     
         4 . The air gun as claimed in  claim 3 , wherein the bushing has at least one through hole communicating with the action space and the pneumatic space, the compressed gas enters the action space via the first air flow passage and flows to the pneumatic space via the through hole to act on the second force-receiving surface, thereby moving the bolt backward until the first force-receiving surface is in contact with the second front wall of the second annular step to be in a standby state. 
     
     
         5 . The air gun as claimed in  claim 1 , wherein the control unit is disposed in the passageway and located behind the firing unit, the control unit has a second outer sleeve located in the passageway, the second outer sleeve has a second air flow space communicating with the first air flow passage, the second air flow space communicates with a pressure-regulating unit via a third air flow passage, the pressure-regulating unit is configured for regulating a gas pressure, the second outer sleeve further has a first control room perpendicular to an axial direction of the passageway and a second control room extending along the axial direction of the passageway, and the second outer sleeve has a fourth air flow passage communicating with the second control room and the second air flow passage. 
     
     
         6 . The air gun as claimed in  claim 5 , wherein the first control room includes a small diameter section and a large diameter section connected to the small diameter section, the small diameter section communicates with a pressure relief port, the large diameter section communicates with the pressure-regulating unit via an air inlet, a trigger valve lever is provided in the first control room, the trigger valve lever is driven by a trigger to move back and forth between a standby position and a firing position; the trigger valve lever includes a first sealing ring located in the small diameter section and a second sealing ring located in the large diameter section, when the trigger valve lever is in the standby position, the first sealing ring closes the small diameter section to block the compressed gas from flowing to the pressure relief port, and the small diameter section communicates with the large diameter section; when the trigger valve lever is in the firing position, the second sealing ring closes the large diameter section, and the small diameter section communicates with the pressure relief port. 
     
     
         7 . The air gun as claimed in  claim 6 , wherein a first side passage, a second side passage and a third side passage that are arranged in sequence from front to back are connected to the second control room, the first side passage communicates with the third air flow passage, the second side passage communicates with the fourth air flow passage, the third side passage communicates with the first control room, an actuating piston is provided in the second control room, the actuating piston is controlled by the gas pressure in the third side passage and a second elastic member to move in the second control room, a third sealing ring located in the second control room is provided between the actuating piston and the third side passage, a fourth sealing ring is provided on the actuating piston, when the trigger valve lever is in the standby position, the actuating piston is pushed by the gas pressure in the third side passage to move the fourth sealing ring forward to communicate with the second side passage; when the trigger valve lever is in the firing position, the actuating piston is pushed by the second elastic member to move the fourth sealing ring backward to close the second side passage.