| 摘要 |
<p>1,029,476. Drills. STORA KOPPARBERGS BERGSLAGS A.B. May 7, 1963 [May 10, 1962], No. 17960/63. Heading B3C. A deep hole drill comprises a drill body 1 having a wear strip 2, a cutting bit 3 held against a seating 5 in a holder 4, which is pivoted about a clamping bolt 8 by a screw 11, in order that the cutting diameter may be varied. The bit may be circular or of polygonal shape, and ends 13 of the body and holder may be radiused to allow for the pivoting of holder 4.</p> |
