公开(公告)号：US4756650A

公开(公告)日：1988-07-12

申请号：US935516

申请日：1986-11-26

申请人： Koichiro Wakihira ,  Michitaka Katsuta ,  Masayasu Hino ,  Kouhei Matsumoto ,  Yoshio Nakahara ,  Tosio Sasayama

发明人： Koichiro Wakihira ,  Michitaka Katsuta ,  Masayasu Hino ,  Kouhei Matsumoto ,  Yoshio Nakahara ,  Tosio Sasayama

IPC分类号： B23B51/02

CPC分类号： B23B51/02 ,  B23B2251/18 ,  B23B2251/241 ,  B23B2251/406 ,  Y10T408/909 ,  Y10T408/9097

摘要： A twist drill including a body characterized by the outer portion of each of the heels bulging toward the main flute as compared with that of the standard twist drill, the main lips each bulging in a triangular shape in cross section toward the main flute as compared with that of the standard twist drill, and a subflute having a substantially U-shaped cross section and axially formed in the inner portion adjacent to the axis of the twist drill of each of the heels along the main flute for a predetermined distance from the tip.

摘要翻译： 一种麻花钻，其特征在于，与标准麻花钻相比，每个高跟鞋的外侧部分均朝向主笛子的外侧部分突出，主唇部分朝向主笛子的横截面呈三角形，与 标准麻花钻，以及具有大致U形横截面的子抽头，并且沿着主笛子轴向地形成在与每个脚踝的麻花钻的轴线相邻的内部中距离尖端预定距离。