| 摘要 |
A boring head has a boring head body having a shank on the upper part thereof, and bit mounting means is slidably fitted into a transverse channel formed on the underside of the body. A bit is secured to the bit mounting means. In one embodiment a bolt is loosely fitted into a transverse hole formed through the mounting means, one end thereof being loosely fitted through a hole formed on one side of the concave channel of the body. The other end of the bolt is screwed into a threaded hole formed on the other side of said concave channel. Wedge members are provided in concavities above the transverse channel which are moved by bolts therethrough to wedge the mounting means downwardly while it is loosely held by the bolt through the transverse hole, after which the bolt s tightened to secure the mounting means. In a second embodiment the mounting means has a helical rack gear thereon meshing with a sliding member in a transverse hole above the transverse channel, and a bolt threaded through the sliding member moves the sliding member when the bolt is rotated, thereby moving the mounting means. |
