| 摘要 |
<p>The object of the invention is to provide a core drill used for forming holes in rock or concrete structures or extracting cylindrical samples, so-called cores, from rock or concrete structures. The core drill is designed to reduce the contact surface area of its cutting edge with the rock or concrete structures during a drilling process, thus minimizing frictional resistance between the cutting edge and the rock or concrete structures and thereby maximizing drilling efficiency. The core drill also smoothly discharges chips and effectively dissipates heat, thus minimizing abrasion of metal bond holding diamond tips on a shank and thereby having a lengthened life span. The core drill includes diamond tips (11) mounted along the end of a cylindrical shank (10) with a tapered external surface (14). Each diamond tip (11) has a sharp edge (12) with a notch.</p> |
