| 摘要 |
A drill chuck in which, when the pressure upon the drill exceeds an adjustable limit during a drilling operation, the drill holding means, for example, a tool socket, is released and moved axially in the direction toward the shank of the chuck so that the drill is relieved from pressure. Such a release of the tool socket or the like and its resulting movement is indicated on the outer slide of the chuck and may also actuate a switch to stop the machine tool.
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