Patent ID: 7334709

Claim:
A pneumatic caulking gun, comprising: a gun body; an air valve mounted in the gun body and provided with an air inlet pipe, an air outlet pipe and a conveying pipe; a control unit movably mounted in the air valve to control connection of the conveying pipe with the air inlet pipe and the air outlet pipe; a trigger pivotally mounted on the gun body and pressed on the control unit to control movement of the control unit; a barrel mounted on the gun body and having a first end connected to the conveying pipe of the air valve and a second end provided with a nozzle; wherein the air valve has an inside formed with a valve chamber for mounting the control unit and connected to the air inlet pipe, the air outlet pipe and the conveying pipe; the control unit includes a press knob movably mounted in the valve chamber of the air valve and having a first end having an inside formed with an air hole connected to the conveying pipe of the air valve and a side formed with a connecting hole connected to the air hole and movable to selectively connect either one the air inlet pipe and the air outlet pipe of the air valve.