专利名称：Drill guide for precise drilling发明人：Edward A. Wang,George M. Kung申请号：US07/384172申请日：19890721公开号：US04961674A公开日：19901009
摘要：A drilling guide for providing stability, direction, force and depth control forprecise drilling comprises a hollow shaft attached to drill shaft casing, a telescopichousing connected to hollow shaft with a close coil spring, a depth measuring scale and aset of locknuts as depth controlling device. The threaded portion of hollow shaftprovides means for depth measuring and controlling surface and nonthreaded portionand outward flange provides means for direction guidance for the housing. The housingwhich could protect adjacent objects from drilling relatively moves upwardly duringdownward movement of hollow shaft and stops at where locknuts are located. Thehousing comprises a serrated edge for aiding stability and vented holes for exitingdrilling byproduct. The close coil spring can provide consistent resistance to preventunexpected plunging of drill bit and can bring the drill bit back to the original positionfollowing the same path of drilling.
申请人：WANG; EDWARD A.,KUNG; GEORGE M.
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