Patent ID: 7597096
Filing Date: 2009-10-06
Classification: F41B

Abstract:
1. A gas gun having an air driving device comprising a hollow upper housing including a feeding inlet provided on and passing through the top surface thereof, including a front port and a rear port, both of which are disposed on and communicating with the bottom of said upper housing respectively, and 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 and rear ports communicating with said control valve through a front hose and a rear hose individually, such that said control valve controls pneumatic air to flow into said front port and said rear 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 conduit portion between which an internal passage is axially 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 the first loading device position, said feeding inlet is closed, and when said loading device is located at the 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 loading device 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, and in said fourth chamber is mounted a resilient element to be compressed by said piston as the pneumatic air flows into said third chamber; wherein said piston is moved between first and second piston positions by the pneumatic air, the first piston position is located at the portion where said piston compresses said resilient element after it moves backward along said second conduit portion, and the second piston position is located at the portion where said piston pushes 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, the first valve position is located at a distal end of an extension of said projectile member, and the 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 the first valve position, it closes said projectile channel so that the pneumatic air flows between said first chamber and said third chamber, and said loading device is pushed to move from the first loading device position to the second loading device position; wherein as said third chamber is supplied with pneumatic air via said rear port and said rear hose and then filled with the pneumatic air completely, said control valve stops inputting the pneumatic air into said rear hose, meanwhile said resilient element, after having been compressed by said piston and the pneumatic air, is allowed to move frontward by using its resilience and the movement of the piston causes the pneumatic air in said third chamber to flow back to impact said air valve to move said air valve toward the second valve position, opening said projectile channel and closing 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 the first loading device position; wherein said fourth chamber includes an offset port which allows the air in said fourth chamber to be expelled to allow said piston to move rearwardly.