DEVICE FOR REAMING HOLES Russian patent published in 1998 - IPC

FIELD: mining and construction equipment, in particular, devices for breaking of oversizes, pipe expansion for larger diameter or for destruction of worn underground pipes and laying in them of new pipes. SUBSTANCE: device has eccentric shaft whose necks carry conical rollers. The front roller is made in the form of centering cylinder whose axis coincides with axis of device shaft. Roller supports are made in the form of plain bearings with autocompensation of wear whose conjugated surfaces are fitted with interference. EFFECT: extended engineering potentialities of device and higher operating reliability due to stabilization of eccentricity of its rollers. 2 cl, 4 dwg