| 摘要 |
A screw driver is provided to accurately locate a front end of the screw driver at a driver groove of a screw when the screw is tightened or loosened by the screw driver. A screw driver(10) comprises a driver body(20) formed into a cylindrical shape excluding a front end of the driver; a guide shaft(22) inserted into the driver body; a spring(24) coupled to an end portion of the guide shaft; a plurality of wires(26) connected to the end portion of the guide shaft and mounted in a groove(28) formed at an outer surface of the driver body; a button(32) formed in the direction of a handle(30) of the driver body; and a push button(34) formed at the handle of the driver body. When the push button is pressed, the wires are extended outwardly from the driver body and hold a head(42) of a screw(40) so as to permit a driver groove of the screw to precisely correspond to the front end of the driver. |
