| 摘要 |
A chuck has a body rotatable about a body axis and having an axially forwardly open central threaded hole and a tightening assembly rotatable about the axis on the chuck body and formed with a plurality of angularly spaced guides each having a face extending at an angle substantially greater than 20° to the body axis. Respective jaws are shiftable along the guide faces between radial outer positions and radial inner positions. A pusher angularly coupled to the jaws and to the tightening assembly is threaded into the hole of the body such that rotation of the assembly on the body in a tightening direction screws the pusher axially forwardly in the chuck body and shifts the jaws axially forward and radially inward on the respective guide faces and opposite rotation in a loosening direction shifts the jaws axially rearward and radially outward on the respective guide faces.
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