| 摘要 |
PROBLEM TO BE SOLVED: To provide an oscillating twist drill which employs a fixed cam but can alleviate oscillation transmitted to a main body housing. SOLUTION: The oscillating twist drill is formed of a spindle 2 which is axially movable and to which rotating force is transmitted, a rotary cam 5 fixed to the spindle 2, and a fixed cam 20 opposed to the rotary cam, and functions to generate oscillation by axial movement of the rotary cam and the spindle due to slip-engagement between cam surfaces formed on mutually opposed surfaces of the fixed cam and the rotary cam when the spindle is rotated. Herein the fixed cam 20 is made axially movable by a minute distance that is smaller than an axial slip-engagement quantity between the fixed cam 20 and the rotary cam 5, and a cushioning member 3 is arranged in a gap between a surface of the fixed cam, opposed to the cam surface, and a fixed cam support member. Therefore an oscillatory impact generated by the slip-engagement and to be transmitted to a motor, is eased by the cushion member. COPYRIGHT: (C)2006,JPO&NCIPI
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