Quick-release valve air gun
An air gun with a quick-release pneumatically operated gas valve that includes a piston positioned in a cylinder with one closed end so that the piston may seat against a gas outlet to close the gas valve. A control reservoir filled with gas to a control pressure is formed in the cylinder between the piston and the closed end of the cylinder so that the control pressure acts against the piston to close the gas valve. Opening a trigger valve allows the gas in the control reservoir to escape through an exhaust port, resulting in the gas valve being rapidly opened.
1. A quick-release valve air gun for shooting a projectile, comprising:
a barrel with a muzzle end and a breech end;
a primary gas reservoir of a gas valve configured with a primary gas outlet in gaseous communication with the breech end of the barrel;
a piston receptacle mounted within the primary gas reservoir so as to be surrounded by the primary gas reservoir;
a piston with an inner end configured to slide into the piston receptacle and with an outer end that provides the gas valve with an airtight seal in a closed state, wherein a control reservoir having a control pressure is formed within the piston receptacle between an inner end of the piston and inner walls of the piston receptacle;
a compressed spring positioned between a closed end of the piston receptacle and the piston to produce a compression spring force on the piston, a sum of control pressure force from the control pressure and the compression spring force acting to push the piston towards the primary gas outlet, wherein an opening force acts to push the piston in a direction opposite the compression spring force and the control pressure force, the opening force being equal to an outlet pressure acting on the outlet area of the primary gas outlet plus a primary gas pressure within the primary gas reservoir acting on an area equal to the cross-sectional area of the piston less the outlet area;
a control conduit in gaseous communication with a trigger means to provide a controllable pathway for releasing control chamber gas from the control reservoir to outside the quick-release valve air gun; and
the trigger means for releasing the control chamber gas from the control reservoir causing the piston to slide away from the primary gas outlet to an open state;
wherein the piston sliding away from the primary gas outlet to the open state releases a sufficient amount of high pressure gas from the primary gas reservoir into the breech end of the barrel to drive the projectile down the barrel out the muzzle end.
2. The quick-release valve air gun of claim 1 , further comprising:
a metering passage configured to provide gaseous communication between the primary gas reservoir to the control reservoir;
wherein a first gas flow capacity of the control conduit is at least three times as large as a second gas flow capacity of the metering passage; and
wherein the piston receptacle has a cylindrical inner surface and is positioned within the primary gas reservoir.
3. The quick-release valve air gun of claim 1 , wherein the projectile weighs at least three pounds.
4. The quick-release valve air gun of claim 1 , wherein the primary gas outlet has an inner edge within the primary gas reservoir, the quick-release valve air gun further comprising:
a sealing component mounted on the inner edge of the primary gas outlet;
wherein the piston has a chamfered edge on the outer end configured to mate up with the sealing component in the closed state of the gas valve.
5. The quick-release valve air gun of claim 4 , wherein the sealing component is an O-ring.
6. The quick-release valve air gun of claim 1 , wherein the control reservoir has a greater volume in the closed state of the gas valve than in the open state of the gas valve.
7. The quick-release valve air gun of claim 6 , wherein a control reservoir pressure within the control reservoir is lower in the open state of the gas valve than in the closed state of the gas valve.
8. The quick-release valve air gun of claim 1 ,
wherein, in response to manipulating the trigger means the control chamber gas in the control reservoir escapes to the outside of the quick-release valve air gun causing the piston to quickly slide away from the primary gas outlet to the open state within 100 milliseconds.
9. The quick-release valve air gun of claim 8 , wherein the trigger means is a trigger valve with a plunger for operating the trigger valve.
10. The quick-release valve air gun of claim 1 , wherein the barrel is one of a plurality of barrels each in gaseous communication with the primary gas outlet.
11. The quick-release valve air gun of claim 10 , wherein the projectile is one of a plurality of projectiles interconnected by a net, each of the plurality of projectiles being configured to fit into one of the plurality of barrels.
12. The quick-release valve air gun of claim 10 , wherein the primary gas reservoir is in gaseous communication with a supply tank, at least part of the supply tank being positioned between the muzzle end of the barrel and the trigger means.
13. A method of configuring a quick-release valve air gun to shoot a projectile, the method comprising:
providing a barrel with a muzzle end and a breech end;
providing a primary gas reservoir of a gas valve, the primary gas reservoir being having primary gas outlet that opens into the breech end of the barrel;
mounting a piston receptacle of the gas valve to be in gaseous communication with the primary gas reservoir and to be surrounded by the primary qas reservoir;
configuring a piston with an inner end configured to slide into the piston receptacle and with an outer end that provides the gas valve with an airtight seal in a closed state closing gaseous communication between the primary gas reservoir and the breech end of the barrel, wherein a control reservoir having a control pressure is formed within the piston receptacle between an inner end of the piston and inner walls of the piston receptacle;
providing a compressed spring between a closed end of the piston receptacle and the piston to produce a compression spring force on the piston, a sum of control pressure force from the control pressure and the compression spring force acting to push the piston towards the primary gas outlet, wherein an opening force acts to push the piston in a direction opposite the compression spring force and the control pressure force, the opening force being equal to an outlet pressure acting on the outlet area of the primary gas outlet plus a primary gas pressure within the primary gas reservoir acting on an area equal to the cross-sectional area of the piston less the outlet area;
providing a control conduit in gaseous communication with a trigger means to create a controllable pathway for releasing control chamber gas from the control reservoir to outside the quick-release valve air gun; and
providing the trigger means for releasing the control chamber gas from the control reservoir causing the piston to slide away from the primary gas outlet to an open state;
wherein the piston sliding away from the primary gas outlet to the open state releases a sufficient amount of high pressure gas from the primary gas reservoir into the breech end of the barrel to drive the projectile down the barrel out the muzzle end.
14. The method of claim 13 , further comprising:
providing a metering passage configured to put the primary gas reservoir in gaseous communication with the control reservoir;
wherein a first gas flow capacity of the control conduit is at least three times as large as a second gas flow capacity of the metering passage;
wherein the piston receptacle has a cylindrical inner surface and is positioned within the primary gas reservoir; and
wherein the projectile weighs at least three pounds.
15. The method of claim 13 , wherein the primary gas outlet has an inner edge within the primary gas reservoir, the method further comprising:
providing a sealing component mounted on the inner edge of the primary gas outlet;
wherein the piston has a chamfered edge on the outer end configured to mate up with the sealing component in the closed state of the gas valve.
16. The method of claim 15 , wherein the sealing component is an o-ring.
17. The method of claim 13 , wherein the control reservoir has a greater volume in the closed state of the gas valve than in the open state of the gas valve; and
wherein a control reservoir pressure within the control reservoir is lower in the open state of the gas valve than in the closed state of the gas valve.
18. The method of claim 1 ,
wherein, in response to manipulating the trigger means the control chamber gas in the control reservoir escapes to the outside of the quick-release valve air gun causing the piston to quickly slide away from the primary gas outlet to the open state within 100 milliseconds.