Patent ID: 7597097
Filing Date: 2009-10-06
Classification: F41B

Abstract:
1. A gas gun having a pneumatic driving device comprising a hollow upper housing including a feeding inlet provided on and passing through the top surface thereof, including a front port, a rear port, and an offset port, all of which are disposed on and communicating with the bottom of said upper housing respectively, including an end cap fixed at an opening of a distal end thereof to tightly cover the opening of the distal end of said upper housing; a hand grip mounted on and extending from the lower side of said upper housing and having a control valve arranged therein, said front, rear, and offset ports communicating with said control valve trough a front hose, a rear hose, and an offset hose individually, such that said control valve controls pneumatic air to flow into said front port, said rear port, or said offset port; wherein a loading device includes a projectile member and a tubular member, one end of said projectile member is provided to propel a paintball, and another end thereof is inserted into said tubular member, said projectile member includes a projectile channel axially mounted therein, and said tubular member includes a first conduit portion and a second portion between which an internal passage axially is arranged, and said tubular member includes a plurality of bores formed therearound, one end of said tubular member is provided to receive said projectile member, and another end thereof is inserted into said end cap; wherein said loading device is disposed in said upper housing so as to be pushed by the pneumatic air to move frontward and backward between first and second loading device positions, such that when said loading device is located at said first loading device position, said feeding inlet is closed, and when said loading device is located at said second loading device position, said feeding inlet is open; wherein a first chamber is formed inside of said tubular member and between said tubular member and said end cap, and a second chamber is formed between said projectile member and said upper housing, said first chamber is in communication with said rear port, and said second chamber is in communication with said front port, between said tubular member and said upper housing is formed a space in which a piston is affixed, by way of said piston, the space is divided into a third chamber and a fourth chamber, said third chamber is located in front of the piston and is in communication with said first chamber via the plurality of bores in said tubular member and the fourth chamber is located in back of the piston and is in communication with said offset port; wherein said piston is moved between first and second piston positions by the pneumatic air, said first piston position is located at the portion where said piston contacts with said end cap after it moves reward along said second conduit portion, and said second piston position is located at the portion where said piston contacts with said first conduit portion after it moves frontward along said second conduit portion; wherein between said projectile channel and said internal passage is defined with an air valve, and said air valve is pushed by the pneumatic air to move frontward and backward between first and second valve positions, said first valve position is located at a distal end of an extension of said projectile member, and said second valve position is located at a distal end of a hollow exterior of said first conduit portion, as said air valve is located at said first valve position, it closes said projectile channel so that the pneumatic air flows among said first chamber, said internal passage and said third chamber, and said loading device is pushed to move from said first loading device position to said second loading device position; wherein as the third chamber is completely full of the pneumatic air, said control valve stops releasing the pneumatic air to the rear port and releases pneumatic air to the offset port, moving the piston forward to push the pneumatic air in said third chamber to impact said air valve so the said air valve is moved toward said second valve position, to open said projectile channel and close said internal passage, such that the pneumatic air flows through said projectile channel to propel said paintball outwardly; wherein as the pneumatic air released from said control valve is inputted into said second chamber through said front hose, said loading device is pushed back to said second loading device position.