| 摘要 |
A drilling device for removing a spot-welded portion which comprises a main body casing 1 having a chuck receiving holder 3, a U-shaped arm 13, an end of which is connected to a side portion of the chuck receiving holder 3, a grip handle 15 pivotally connected to the base shoulder portion of the U-shaped arm 13, a chuck thrusting arm 16 mounted integrally at an end of the grip handle 15, a chuck 5 having a drill fixed at a free end of the chuck 5, the drill 8 is faced to a free end of the U-shaped arm 13, and a chuck receiver 4 for receiving the chuck 5 slidably inserted into main body casing 1. The chuck 5 projects with rotation in the direction so as to be close to the free end of the U-shaped arm 13 according to the movement of the chuck receiver 4 by depression of the grip handle 15, the force of which is transmitted via the chuck thrusting arm 16. The drilling device further comprises a projection amount adjusting screw 19 for adjusting the amount of projection of the chuck 5. |
