Rotatable sleeve for self-sharpening bit
专利汇可以提供Rotatable sleeve for self-sharpening bit专利检索，专利查询，专利分析的服务。并且A bit and block assembly in which a sleeve is rotatively mounted in a block bore and in which a point-attack bit has its elongate shank mounted in a sleeve bore and has a cutting tip on the leading end of the bit head that penetrates the material being mined with a picking action upon travel of the bit into and out of a mine face. A plurality of protuberances are provided on and extend outwardly from the periphery of the sleeve head, the protuberances providing frictional contact with the material being mined to effect positive turning of the sleeve, and hence of the bit in the sleeve, upon picking of the mine face by the bit head. In one embodiment, the protuberances consist of fins on and extending substantially lengthwise of the sleeve head and projecting laterally outwardly from the periphery of the sleeve head. In another embodiment, the protuberances consist of individual knobs formed on and projecting laterally outwardly from the periphery of the sleeve head. The protuberances are circumferentially spaced about the periphery of the sleeve head to provide longitudinal passages therebetween extending from its leading end to its trailing end, the material being mined being movable through the passages and engageable with the protuberances to effect positive turning of the sleeve and bit and to effect removal of the material being mined from the sleeve head. The sleeve head with its protuberances extends laterally outwardly beyond the outer block face to enable discharge of the material being mined from the passages between the circumferentially spaced protuberances.，下面是Rotatable sleeve for self-sharpening bit专利的具体信息内容。
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