Apparatus for grinding concrete bits or the like

Claim 2

Apparatus for grinding elongate concrete bits having worn forward ends, comprising: frame means; at least one grinding wheel having a radial grinding face; means on said frame mounting said wheel for rotation about a substantially vertical axis with said face thereof facing upwardly and extending generally horizontally; means for imparting said rotation to said wheel during operation of the apparatus; bit mounting means spaced laterally from said grinding wheel for pivotally mounting a plurality of concrete bits adjacent the rear end portions thereof in longitudinally fixed and forwardly and downwardly inclined relationship to said face of said grinding wheel, with the forward ends of said bits overlying said face for engagement therewith during a grinding operation, for free vertical movement of said forward ends of said bits relative to said grinding wheel face and for lateral movement of said forward ends of said bits generally radially of said grinding wheel face toward and away from its central axis; and power-operated means engagable with said concrete bits intermediate said bit mounting means and said grinding wheel for simultaneously imparting, during operation of the apparatus, said lateral movement to said forward ends of said bits to regulate the temperature and prevent overheating thereof.

Claim 3

Apparatus as in claim 1, and further including abutment means spaced from said bits during grinding thereof but engagable with each of said bits intermediate its length, upon completion of the grinding of said forward end thereof, for then arresting further downward pivotal movement of said bit toward said grinding wheel face and for thereby arresting further grinding of said forward end thereof.

Claim 4

Apparatus as in claim 1, and further including support means carried by said frame and extending transversely of and in underlying relationship to said bits intermediate their length for movement between an elevated position wherein said support means substantially simultaneously engages all of said bits and supports the same out of engagement with said grinding wheel face and a lowered position wherein said support means is out of engagement with said concrete bits, and lever means operatively connected to said support means for moving the same between said positions thereof at the outset of a grinding operation.

Claim 5

Apparatus as in claim 1, and further including cam means cooperable with said means for imparting lateral movement to said bits for periodically camming said bits, in response to said lateral movement thereof, out of engagement with said grinding wheel face to assist in regulating the temperature and preventing overheating of said bits.

Claim 6

Apparatus as in claim 1, wherein said bit mounting means comprises a mounting assembly for each of said bits, each mounting assembly being supported by said frame rearwardly of said grinding wheel and including an elongate tubular member pivotable about generally vertically and horizontally extending axes and adapted to receive therein the rear end portion of one of said bits.

Claim 7

Apparatus as in claim 5, wherein each said mounting assembly further includes a split-collar member within said tubular member between said tubular member and said rear end portion of said bit.

Claim 8

Apparatus for grinding elongate concrete bits having worn forward ends, comprising: elongate frame means; a plurality of grinding wheels each having an upper radial face, said wheels being mounted for rotation upon said frame means in longitudinally spaced relationship to each other with said faces thereof all lyinG in approximately the same plane; means for rotating said wheels during operation of the apparatus; means for pivotally mounting a plurality of concrete bits adjacent the rear end portions thereof in inclined relationship to said face of each of said grinding wheels, with the forward ends of said bits overlying said face of the associated one of said wheels for engagement therewith during a grinding operation; means for automatically and simultaneously imparting temperature-regulating pivotal movement to all of said bits to prevent overheating during grinding of said forward ends thereof; and means for automatically arresting grinding of each of said bits, independently and without interrupting grinding of the remainder of said bits, when said forward end thereof has been ground to a predetermined desired shape.

Claim 9

Apparatus for grinding elongate concrete bits having worn forward ends, comprising: elongate frame means; a plurality of grinding wheels each having an upper radial face, said wheels being mounted for rotation upon said frame means in longitudinally spaced relationship to each other with said faces thereof all lyinG in approximately the same plane; means for rotating said wheels during operation of the apparatus; means for pivotally mounting a plurality of concrete bits adjacent the rear end portions thereof in inclined relationship to said face of each of said grinding wheels, with the forward ends of said bits overlying said face of the associated one of said wheels for engagement therewith during a grinding operation; means for automatically and simultaneously imparting temperature-regulating pivotal movement to all of said bits to prevent overheating during grinding of said forward ends thereof; and means for automatically arresting grinding of each of said bits, independently and without interrupting grinding of the remainder of said bits, when said forward end thereof has been ground to a predetermined desired shape.

Claim 10

Apparatus as in claim 7, and further including support means for simultaneously pivoting all of said bits out of engagement with said grinding wheels while said wheels are brought to operational speed at the outset of a grinding operation.

Claim 11

Apparatus for grinding elongate concrete bits having worn forward ends, comprising: frame means; at least one grinding wheel having a radial grinding face; means on said frame mounting said wheel for rotation about a substantially vertical axis with said face thereof facing upwardly and extending generally horizontally; means for imparting said rotation to said wheel during operation of the apparatus; means for pivotally mounting a plurality of concrete bits adjacent the rear end portions thereof in forwardly and downwardly inclined relationship to said face of said grinding wheel, with the forward ends of said bits overlying said face for engagement therewith during a grinding operation, for free vertical movement of said forward ends of said bits relative to said grinding wheel face and for lateral movement of said forward ends of said bits generally radially of said grinding wheel face toward and away from its central axis; and means for imparting, during operation of the apparatus, said lateral movement to said forward ends of said bits to regulate the temperature and prevent overheating thereof, said means including rod means extending in underlying spaced relationship to said bits intermediate their length and mounted by said frame for axial longitudinal reciprocatory movement, a plurality of pin elements carried by said rod means at spaced locations sides of each of said concrete bits for engagement with said bits during reciprocatory movement of said rod means, and drive means connected to said rod means for reciprocating said rod means during operation of the apparatus.

Claim 12

Apparatus for grinding elongate concrete bits having worn forward ends, comprising: frame means; at least one grinding wheel having a radial grinding face; means on said frame mounting said wheel for rotation about a substantially vertical axis with said face thereof facing upwardly and extending generally horizontally; means for imparting said rotation to said wheel during operation of the apparatus; means for pivotally mounting a plurality of concrete bits adjacent the rear end portions thereof in forwardly and downwardly inclined relationship to said face of said grinding wheel, with the forward ends of said bits overlying said face for engagement therewith during a grinding operation, for free vertical movement of said forward ends of said bits relative to said grinding wheel face and for lateral movement of said forward ends of said bits generally radially of said grinding wheel face toward and away from its central axis; and means for imparting, during operation of the apparatus, said lateral movement to said forward ends of said bits to regulate the temperature and prevent overheating thereof, said means including rod means extending in underlying spaced relationship to said bits intermediate their length and mounted by said frame for axial longitudinal reciprocatory movement, a plurality of pin elements carried by said rod means at spaced locations sides of each of said concrete bits for engagement with said bits during reciprocatory movement of said rod means, and drive means connected to said rod means for reciprocating said rod means during operation of the apparatus.