| 摘要 |
There is described in the specification a manually operated drawbar device for changing the collet or cutting tool on a milling head of a milling machine. The drawbar device is lowered to engage the drawbar head with a wrench socket. The socket is rotated in either direction with a hand crank and chain drive to loosen or secure a collet or cutting tool in the milling head spindle. After loosening the drawbar head and raising the wrench socket from engagement with the drawbar head, the drawbar head is automatically impacted to ensure that the collet or tool releases readily from the spindle.
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