FIELD: drilling equipment. SUBSTANCE: invention is related to design of rock-breaking tools-drill bits intended to drill boreholes in oil, gas and ore-excavating industries. Support includes pivot, rotary bit, conical plain bearing whose matching surfaces are conical. Circular grooves where lock composed of split cover with restoring sealing element, rubber and metal spacer is located are made in upper parts of rotary bit and pivot. Fixing members are anchored on rotary bit. EFFECT: raised reliability and service life of support of such design, reduced labor input to its manufacture. 1 dwg
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