BORING CROWN WITH REPLACEABLE CUTTING UNIT Russian patent published in 2017 - IPC B23B51/04 B28D1/14 E21B10/46 

FIELD: machine engineering.

SUBSTANCE: boring crown contains the cutting unit with the circular section, which at the first end is connected to one or more cutting elements, and the second end has external plug-in element and the shoulder. The section of the bore bit core has the cylindrical shank, which has at one end facing the cutting part, the internal plug-in element with the end surface. The plug-in element forms the insertion connection in the direction parallel to the axis of rotation. In addition, it can be connected by means of at least one rod element, which can be inserted into at least one opening in the form of the slot. At least one rod element is fixed to the outer side of the inner plug-in element. The outer plug-in element has at least one opening in the form of the slot.

EFFECT: unintentional opening of the boring crown elements and the disconnection of the replaceable cutting unit are excluded, the drilling stability and the tensile load resistance from the drilling machine side are increased.

22 cl, 5 dwg