| 摘要 |
A tool holder having a cylindrical outer housing adapted to be inserted into a chuck of a rotary drive mechanism. A tool supporting rod is axially slidably mounted in a bore formed in the housing for rotation about its axis of elongation. A coil spring disposed within the bore between the inner end of the tool supporting rod and the closed end of the bore biases the rod toward an extended position. During the feed-in of the machine chuck in the deburring of holes, the coil spring can be compressed to permit the tool to be retracted when the deburring tool engages an unfinished hole resulting from drill breakage to thereby prevent the deburring tool from being forced into the unfinished hole and thereby broken.
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