Patent ID: 9050660
Filing Date: 2015-06-09
Classification: B23B,Y10S,Y10T

Abstract:
1. A drilling apparatus comprising a power unit having a tubular drill spindle rotationally mounted in a housing and centered on an axis; a drill chuck having a chuck body provided with a threaded tube coaxial to the spindle; a driver having a threaded stem engaging coaxially in the tube of the chuck body; a tightening sleeve rotatable coaxially relative to the chuck body; a jaw holder formed with guides; jaws radially shiftable in the guides and on the driver; a coupling rod rotationally connected with and engaged in the threaded tube and movable between a locked position in which the coupling rod is rotationally coupled with the housing and a drilling position rotationally coupled with the drill spindle; and a coupling disk on an end of the coupling rod remote from the threaded tube, the disk having a flat face formed with spur-gear teeth engaging against complementary teeth of the housing in the locked position and against the drill spindle in the drilling position.