FIELD: mining.
SUBSTANCE: invention relates to a chisel for use in a well. The chisel contains: a paw with a middle nape and a lower bearing axis; a conical cutter mounted with the possibility of rotation on the lower bearing axis; a number of calibrating cutting elements, a number of inner cutting elements and an apical cutting element. Each cutting element is mounted or made on the conical cutter. The chisel also contains: an oil seal made in the inner surface of the conical cutter and having a wall, an outer surface, a rounding connected to the outer surface, and an angle connecting the wall and the outer surface; and an elastomeric ring of circular cross-section installed in the oil seal and compressed between the outer surface and the lower bearing axis. The radius of the rounding is more than half the diameter of the ring cross-section.
EFFECT: ensuring the effective operation of the seal.
19 cl, 3 dwg
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