Automatic impact screwdriver

An automatic impact screwdriver comprising a handle of hollow construction and having a long helical spring, an impact rod, a short helical spring, an action rod, and a fitting rod, which are housed therein in that order, with said fitting rod having a front end extending beyond a front end of said handle to fit into a head tip;

• wherein said handle comprises a main body of hollow construction and having a front end fastened with a front sleeve and having a rear end fastened with a rear sleeve, said main body further having an annular flange disposed in an inner wall of a hollow interior thereof and provided on a front end thereof with a guide bevel and on a rear end thereof with a vertical stopping edge;
• wherein said fitting rod is of slightly T-shaped construction and provided on a rear end thereof with a protruded ring making said rear end greater in dimension than a front end of said fitting rod;
• wherein said action rod is fitted into said short helical spring and then disposed eccentrically in said hollow interior of said main body of said handle such that a front end of said action rod is in contact with said protruded ring of said fitting rod, and that a rear end of said action rod presses against one side of a front end of said impact rod, said action rod further comprising at a midpoint thereof a guiding slant;
• wherein said impact rod is of columnar construction and provided with a slot located centrally in a front end surface thereof and with a rear end urged by a front end of said long helical spring;
• and wherein said action rod can be caused to move rearward for a predetermined distance such that said guiding slant of said action rod makes contact with said guide bevel of said main body, and that said rear end of said action rod is shifted to fall into said slot of said impact rod, thereby causing said impact rod by said long helical spring to generate instantly an impact force, which is imparted to said action rod and then to said fitting rod.