| 摘要 |
A lockable drill chuck has a body centered on and rotatable about an axis and formed with a plurality of angled guides opening axially forward at a front chuck end, respective jaws axially and radially displaceable in the guides and each formed with a row of teeth, and a tightening ring axially fixed but rotatable about the axis on the body and having a screwthread meshing with the teeth so that rotation of the inner ring on the body in a tightening direction displaces the jaws in their guides toward one other and rotation in a loosening direction displaces the jaws away from one other. A one-piece outer sleeve rotatable about the axis on the body is formed unitarily with a pressed-in radially inwardly projecting cam formation. A locking member is displaceable by the cam formation between a locked position braced between the chuck body and the tightening ring for blocking rotation about the axis of the tightening ring on the body in the loosening direction and an unlocked position for permitting such rotation. The outer sleeve is metallic, of substantially uniform wall thickness, and formed with an outwardly open pocket at the cam formation.
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