| 摘要 |
A power drill has a rotatable spindle extending from a power-unit housing, a chuck body rotationally fixed to the spindle, a jaw guide carried on the chuck body and rotatable relative thereto about the axis, jaws carried in the chuck body, and a pusher element rotatable about the axis in the chuck body and fixed to and bearing axially on the jaws. Screwthreads between the pusher element and the spindle is effective to move the jaws radially on rotation of the spindle about the axis relative to the guide. A coupling sleeve rotationally fixed to the jaw guide is movable between a tightening position rotationally fixed to the housing for movement of the jaws by the pusher element on rotation of the spindle and a drilling position rotationally fixed to the spindle and rotatable relative to the guide for joint rotation of the guide, jaws, and spindle. |
| 主权项 |
1. A power drill comprising:
a power-unit housing; a drill spindle extending from the housing and rotatable about and centered on an axis; a chuck body rotationally fixed to the drill spindle; a jaw guide carried on the chuck body, formed with at least one axially rearwardly open recess, and rotatable relative thereto about the axis; jaws carried in the chuck body; a pusher element rotatable about the axis in the chuck body and fixed to and bearing axially on the jaws; screwthreads between the pusher element and the drill spindle effective to move the jaws radially together on rotation of the spindle about the axis in a tightening direction relative to the guide and radially apart on opposite rotation of the spindle about the axis in a loosening direction; a coupling sleeve rotationally fixed to the jaw guide, formed with a forwardly projecting lobe complementarily received and axially shiftable in the recess, and movable between a tightening position rotationally fixed to the housing for movement of the jaws by the pusher element on rotation of the spindle and a drilling position rotationally fixed to the spindle and rotatable relative to the guide for joint rotation of the guide, jaws, and spindle. |
