ROLLING CUTTER DRILL BIT SUPPORT Russian patent published in 2012 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: support feature is design of a ball plug in the form of an eccentric two-stage rod with a common generatrix and a bore at a stage of smaller diameter. At the same time the support is equipped with an insert installed in the bore, having a segment shape in the cross section, the external and internal surfaces of which are eccentric, and a collet element of conical shape arranged between the insert and the channel mouth. Besides, the channel in the leg for the ball plug is made with a conical bore for the collet element, the larger base of which is arranged at the side of the channel mouth, and has a shape of two crossing cylinders with parallel axes for the plug. At the same time the axis of the cylinder of the smaller diameter is arranged coaxially with the axis of the inner surface of the insert, and the axis of the cylinder of larger diameter - coaxially with the axis of the external surface of the insert. The collet element may be arranged as a whole with the insert, also in the form of a separate element, at the same time the end of the collet element at the side of the ball plug is installed as capable of cooperation with the insert end.

EFFECT: improved reliability of retaining bearing fixation, which results in higher operability of the support and the drill bit as a whole.

4 cl, 3 dwg