Patent ID: 7703651

Claim:
A driving tool comprising: a hollow body; a striking cylinder disposed in the body; a striking piston slidably accommodated in the striking cylinder; a main air chamber disposed outside of the striking cylinder for reserving compressed air; a cylinder cap fixed on an upper portion of the body covering the striking cylinder and the main air chamber; a head valve which opens and closes the main air chamber and the striking cylinder, wherein a lower portion of the head valve is disposed outside of the striking cylinder; a cylindrical inner wall and a cylindrical outer wall which are provided at a lower surface of the cylinder cap and are integrally formed with the cylinder cap; a piston stop which is provided inside of the cylindrical inner wall and defines a top dead center of the striking piston; an exhaust port penetrating through a lower portion of a side wall of the cylinder cap; and an exhaust port penetrating the head valve, wherein the head valve is slidably disposed between the cylindrical inner wall and the cylindrical outer wall, and when the head valve closes, the exhaust port of the cylinder cap is connected with an upper portion of the striking cylinder via the exhaust port of the head valve.