| 摘要 |
A drill chuck has an axially centered chuck body, an adjustment body rotatable but axially fixed on the chuck body, and jaws radially displaceable on the chuck body. The adjustment body is formed with a screwthread meshing with teeth of the jaws so that relative rotation of the bodies in a tightening direction moves the jaws together and opposite rotation moves them apart. A radially outwardly projecting tab fixed on the chuck body has a pair of angularly oppositely directed end faces and a locking ring axially displaceable on the chuck body between freeing locking positions is formed with an inwardly open pocket receiving the tab and having a pair of angularly confronting end faces engageable with the respective end faces of the tab and spaced angularly apart by a distance substantially greater than the tab width. A tightening spring connected between the locking ring and chuck body urges the locking ring in the tightening direction. Axially interengageable coupling formations on the locking ring and adjustment body rotationally couple the locking ring to the adjustment body in the locking position of the locking ring and permit relative rotation of the locking ring and adjustment body in the freeing position of the locking ring. At least one locking spring braced between the chuck body and the locking ring urges the locking ring into the locking position. |
