| 摘要 |
A lathe chuck has a rotatable chuck body formed with jaw guides and with respective secantally extending rack guides crossing the jaw guides. Jaws are radially displaceable in the jaw guides between radial inner and outer end positions and have axially backwardly directed jaw teeth. Racks are secantally displaceable in the rack guides, and respective bolts in the racks each have teeth meshable with the respective jaw teeth and are each displaceable between a forward meshing position and a rear out-of-mesh position. A slide assembly in the body has respective cam surfaces engageable with the bolts and is displaceable angularly between a holding position retaining the bolts in the meshing position and a freeing position allowing the bolts to move into the out-of-mesh positions. Pins displaceable on the bolts have outer ends engageable with the respective jaws in both the meshing and out-of-mesh positions of the bolts. |
