DRILL AND MAGNETIC CARTRIDGE FOR ITS FIXATION Russian patent published in 2011 - IPC B23B31/28 B23B51/00 

FIELD: technological processes.

SUBSTANCE: drill comprises a cutting part and a tail part, where there is a polyhedral side surface at the side of the cutting part with a cross section in the form of a polygon that is symmetrical relative to the drill axis. In order to increase manufacturability of a drill and a cartridge, it is equipped with a cylindrical rod of magnetic material connected to the end of the tail part opposite to the cutting part, at the same time the axis of the rod matches the drill axis, and its diameter is less than the diameter of the circumference included into the specified polygon of cross section of the polyhedral side surface of the tail part. The magnetic cartridge comprises a body with a part for fixation in the machine or the electric tool, and a magnet, the body of which has a longitudinal hole, in which at the end side facing the cutting part of the drill there is a bushing installed and rigidly fixed as designed for interaction with the polyhedral side surface of the drill and having the central hole limited with the polyhedral surface with cross section in the form of a polygon symmetrical to the cartridge axis. At the same time the magnet is installed in the longitudinal axis of the body at the distance from the specified end, between the magnet and the bushing with the polyhedral hole there is a bushing installed and rigidly fixed in the longitudinal hole of the body, and this bushing has a central cylindrical hole to locate a rod attached to the tail part of the drill.

EFFECT: increased manufacturability of drill and cartridge.

2 cl, 4 dwg