Patent ID: 7448524

Claim:
A moveable cylinder driving air passage of a nail gun with a gun body, the gun body having a moveable cylinder, an air collecting chamber and a main passage, the air passage comprising: a trigger valve between the air collecting chamber and the main passage; an air-in passage formed in the trigger valve connecting between the air collecting chamber and the main passage; an air-out passage formed in the trigger valve connecting between the main passage and external atmosphere; a valve bar slidably disposed in the trigger valve, the valve bar being capable of closing the air-in passage and opening the air-out passage while being released, and opening the air-in passage and closing the air-out passage while being pressed; a stopper ring formed at an outside surface of the moveable cylinder and slidably attached in the gun body; an air tank formed at an upper portion of the stopper ring; a main chamber formed at a bottom portion of the stopper ring, the main chamber connecting with the air-in passage and the air-out passage; and a cylinder sleeve disposed at the outside surface of the moveable cylinder and at an inner surface of the gun body, wherein the air tank is formed in the cylinder sleeve, and the cylinder sleeve comprises at least one through hole for continuously guiding the high pressure air from the air collecting chamber into the air tank; wherein the main chamber is capable of collecting the high pressure air via the air-in passage to actuate the moveable cylinder to move up while the valve bar is pressed, and the main chamber is also capable of exhausting the high pressure air via the air-out passage to actuate the moveable cylinder to move down for reposition while the valve bar is released.