| 摘要 |
The invention provides a tube cutter of the type which forces a tool bit against an interior tube wall as the bit is rotated to sever the tube from the inside. The inventive tool cutter comprises a housing for holding the tool bit at a distance from the tube end as the tool bit is rotated; a feed shaft positioned by the housing for converting axial force along the feed shaft into radially directed pressure forcing the tool bit outwardly against the interior tube wall at the distance from the tube end as the tool bit is rotated; a drive means positioned by the housing for releaseable drive engagement with the feed shaft, the drive means having a released non-feed position and an engaged feed position in which axial force is applied to the feed shaft; means positioned by said housing for actuating the drive means between the released position and the engaged position; and means positioned by the housing for limiting the maximum axial force applied by the drive means to said feed shaft so that the maximum radial force on the tool bit is limited.
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