SUPPORT OF BORING ROCK-BREAKING TOOL Russian patent published in 2009 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: invention is related to supports of rock-breaking tool of roller cutter type, namely to supports of drill bits, calibrators and expanders. Support includes journal, roller cutter installed in it, and slide bearing with cemented layer and dead holes. Specific feature of support consists in the fact that it is equipped with floating bearing installed on journal and arranged in the form of at least two concentrically installed bushes with dead holes. These holes in bush with larger diametre are arranged on internal surface, and in bush with smaller diametre - on external surface. At the same time distance between bottom of dead channels and according surface of bushes is not less than permissible value of slide bearing wear. In assembled condition bushes are fixed relative to each other to prevent mutual slipping.

EFFECT: improved wear resistance and serviceability of both support and the whole rock-breaking tool.

4 cl, 3 dwg