| 摘要 |
<p>The disclosure relates to an adjustable screw driver having an improved structure, and more particularly to an adjustable screw driver with a detachable shank having two different tips, a symmetrically-grooved handle on which a flute is set for disposing a wire spring which is attached to the handle by a screw at one end and associated with a control plate by its other end through an aperture of the plate having a square engaging hole at the center. A piece of restraining board having a cut on its periphery is fixed to the bottom of the handle by screws. A shank Which has one side partially toothed is disposed through the central opening of restraining board and the engaging hole of control plate then into a shankreceiving tunnel inside the handle right after the control plate is pushed upward by one of its end so to make the central opening and the engaging hole as well as the tunnel line collinearly for reception of the shank which can be adjusted of its length by engaging proper tooth with the engaging hole for various working conditions.</p> |
