Drill |
|||||||
| 申请号 | JP31971388 | 申请日 | 1988-12-20 | 公开(公告)号 | JPH01204705A | 公开(公告)日 | 1989-08-17 |
| 申请人 | Artur Fischer Gmbh; | 发明人 | ARUTSUURU FUITSUSHIYAA; | ||||
| 摘要 | PURPOSE: To improve centering characteristics when a drill hole is formed in a constructed wall part by forming a drill head part so as to have a diameter larger than that of a drill shaft and protruding a side surface blade slightly from the side part of a head part. CONSTITUTION: A drill is formed of a drill shaft 1, one cutting plate 2 and two cutting plates 3, 4 shifted by 90° with respect to the cutting plate 2. Cutting plates 2-4 are inserted into the slit part of a drill head part 5 having a diameter larger than that of the drill shaft 1. The drill head part 5 has a cylindrical circumferential surface 6 and this circumferential surface 6 transfers to the shaft 1 through a conical part 7. The shaft 1 has a spiral drill groove 8 and chip generated during drilling work is fed out to the outside from a drill hole by the groove 8. COPYRIGHT: (C)1989,JPO |
||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈