| 摘要 |
An extension tool holder having a cylindrical outer housing adapted to be inserted into a chuck of a rotary drive machine. A tool holding 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 around the rod biases the rod into the bore. During the back-stroke of the machine chuck, in the deburring of holes the coil spring compresses due to the engagement of the cutting edge of the deburring tool and the edge of the hole being deburred, allowing the deburring tool to delay at the edge of the hole to adequately deburr the workpiece.
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