WELL-SINKING DEVICE Russian patent published in 1997 - IPC

FIELD: construction, applicable for well-sinking without excavation of soil. SUBSTANCE: the device uses a motor-reduction gear, whose output shaft is connected to the drive shaft having eccentric taper and cylindrical rolls spread about the device longitudinal axis for independent rotation. packing pieces located between the rolls. The points, around which the rolls are spread, make up helical lines, whose leads are equal to the lead of the helical line of rolls revolution over the well wall. The angle of helix of the rolls axes relative to the device axis is determined by a mathematical formula. The rolls taper angles are equal to the respective taper angles of the conical helices formed by the points around which the rolls are spread. EFFECT: enhanced efficiency. 2 cl, 2 dwg