Screw driver having an illuminating unit mounted thereto

A screw driver including a handle and a shank having a front end with a tip for turning a screw and a rear end fixed to a front end of said handle, said handle confining a compartment for receiving a cell means with a positive terminal connected to said rear end of said shank and a negative terminal, said screw driver further having a slidable member mounted slidably on said shank, an illuminating means fixed on a front portion of said slidable member, means for connecting electrically said illuminating means and said cell means including a coil of wire having a first end connected to said negative terminal of said cell means, and a conducting clamp disposed within said slidable member and clamping said shank, said illuminating means having a first electrode connected electrically to said conducting clamp of said slidable member and a second electrode connected electrically to a second end of said wire;

• wherein the improvement comprises:
• said shank further includes an insulating sleeve member disposed on said rear end of said shank such that when said slidable member is moved to said rear end of said shank adjacent to said front end of said handle, said insulating sleeve member is disposed between said rear end of said shank and said conducting clamp in said slidable member, thereby disconnecting electrically said conducting clamp and said shank.