Title: Combination extension and compression tool holder

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Abstract: A combination extension and compression 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 cylindrical recess formed in the housing for rotation about its axis of elongation. Two opposing helical springs are disposed within the cylindrical recess and bias the tool holding rod towards an intermediate position within the cylindrical recess. During the feed-in of the machine chuck during a deburring operation, one of the helical springs can be compressed to permit the deburring 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. During the deburring operation of a normally formed hole, the compression spring will permit the deburring tool to dwell at the opening of the hole for a better deburring operation. When the deburring tool is retracted from a normally formed hole, the extension helical spring will compress and permit the deburring tool to dwell at the edge of the hole to adequately debur the workpiece.


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