Patent ID: 8162195

Claim:
A trigger valve controlling device for a pneumatic nail gun, is disposed in a gun body which comprises a main cylinder chamber filled with a high pressure air, an upper air outlet, a hitting bar, a bottom cylinder chamber and a trigger valve, comprising: a main air passageway formed on a periphery of the trigger valve, and being intercommunicated with the main cylinder chamber and the bottom cylinder chamber; a valve sleeve sleeved on the periphery of the trigger valve, being located in the main air passageway, and separating the main air passageway into a front passageway intercommunicated with the main air chambers, a middle chamber and a rear passageway intercommunicated with the bottom cylinder chamber, the high pressure air in the main cylinder chamber flowing into the front passageway to compress; a main air valve opening disposed between the front passageway and the rear passageway, the main air valve being opened and closed by the valve sleeve; a secondary air passageway intercommunicated with the main cylinder chamber and the middle chamber, guiding the high pressure air to enter into the middle chamber to compress, the valve sleeve being pushed the high pressure air in the middle chamber to move linearly downward, thereby closing the main air valve opening, the trigger valve being released after the nail gun hitting nails and before the hitting bar being reset, the high pressure air in the secondary air passageway and the middle chamber flowing to the upper air outlet, so that the valve sleeve is driven by the high pressure air in the front passageway to linearly move upward, thereby opening the main air valve opening, the high pressure air in the front passageway entering into the bottom cylinder chamber via the rear passageway, so as to drive the hitting bar to move upward to reset.