Patent ID: 7670089

Claim:
An improved simple inclined-hole drilling jig, comprising a jig body with a long shaft extension having a crossover plane able to press evenly against the wood workpiece at its bottom and a beveled end member disposed at the front end of the long shaft; the beveled end member being at least concavely configured with a guiding shaft hole, which extends downwardly from the beveled end member through the crossover plane; the upper end of guiding shaft hole being slidingly configured with a guide bushing for a drill bit to pass through; the rear end and side surfaces of the jig body being respectively formed with a reference face and two sidewalls perpendicular to the crossover plane; characterized in which the sidewall is at least concavely disposed with a dust guide groove intercrossing the guiding shaft hole, and slidingly disposed with a graduated extension board in a manner that allows axial displacement and positioning; the end of the extension board is bent to form a retaining end plane parallel to the reference face to replace the reference face of the jig body and extendingly adjust the axle spread of the reference face, thereby greatly enhancing the operating performance of the simple drilling jig; wherein the extension board is concavely disposed along its long axis with an upper and a lower sliding slot parallel to each other, which are preset with metric and inch marks at the upper margin; the two sidewalls of the jig body have respectively a through hole vertically and concavely disposed relative to the parallel sliding slots, which, coupled with a set of lock bolt and nut, secures the extension board; wherein the inside of the bent retaining end plane at the end of the extension board is slidingly disposed with a retainer plate of smaller area to provide another axle spread reference.