Lei Ye,Jian Zhou,Hua Feng,Fei Li,Hengyang Zhu,Congxiao Li
申请号：
US13823095
公开号：
US20130178858A1
申请日:
2011.08.26
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A drill bit locking device and a drill bit are provided. The locking device includes a boss with a through hole, a bearing and a support member are arranged an inner wall of a small cylinder above the boss a locking sleeve is sleeved over the boss, a first bulge is on an inner wall of an upper part of the locking sleeve, and a second bulge is on an inner wall of a lower part a spring is between the second bulge and an upper bottom surface of the boss a press plate is threadedly connected with an outer wall of a top part of the small cylinder and presses against the first bulge holes of different sizes are on the inner wall of the small cylinder and the support member to form a stepped hole, and a steel ball is arranged in the stepped hole.
