| 摘要 |
PCT No. PCT/US95/15465 Sec. 371 Date Nov. 15, 1995 Sec. 102(e) Date Nov. 15, 1995 PCT Filed Nov. 16, 1993 PCT Pub. No. WO96/16293 PCT Pub. Date May 30, 1996A self-centering wall anchor 10, 100 having an outwardly threaded hollow cylindrical body 101, 111 with a flanged proximal end and a cutting distal end. The hollow cylindrical body diminishes in diameter toward the distal cutting end 20, 110 in the form of a pointed dome with a pointed centering tip 22, 103 at the center axis of the anchor. An inner bore 14, 105 extends continuously from its opening at the proximal end of the anchor along the center axis of the cylindrical body to the centering tip at the distal end where it is partially closed because of the disposition of the centering tip at the center axis. The distal end of the bore is in the form of a deep flute 21, 105a which communicates and is part of the inner bore and is defined at its outer edges by a leading cutting edge 23, 107 and a trailing edge 24, 108 of the single cutter, with the leading cutting edge extending from the pointed tip in a curved distention. In one instance, the outer thread extends to the centering tip and is interrupted in the area of the bore opening to assure optimum access to material cut from the wall as the anchor is rotated.
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