Vertical shaft impact crusher rings

Claim 1

A vertical shaft impact crusher, having a cylindrical tank in which a rotor is mounted for rotation about a vertical axis for receiving rock fed axially from above and having shoes for accelerating and throwing the rock outward against an annular breaker ring, wherein said breaker ring comprises: a circular hoop of a radius slightly smaller than the radius of said tank; a series of brackets welded to the inside of said hoop at angularly spaced positions therearound, said brackets each having two legs fastened to and extending inwardly from said hoop on a secant to the circle of said hoop; a cross arm fastened to said legs and extending between them; means in said cross arm defining a vertically elongated slot extending completely therethrough; and a support plate fastened to the bottom of said legs and said cross arm; an anvil supported by each of said brackets, each anvil having a central axis and a massive head with a flat face lying perpendicular to said central anvil axis, said head having a regular octagonal cross-sectional shape symmetrical about said central anvil axis; said anvil further comprising a neck having a cross-sectional polygonal shape perpendicular to and symmetrical about said anvil axis and which is slightly narrower, along a line perpendicular to the faces of said polygon and through said anvil axis, than the width of said slot in said cross arm; a foot connected to said head by said neck and having a cross-sectional polygonal shape similar to said cross-sectional polygonal shape of said neck and substantially wider, along a line perpendicular to the faces of said foot polygonal shape and through said anvil axis, than the width of said slot in said cross arm; and said foot and neck polygonal shape and having a number of faces equal to a multiple of four so that said anvil may be oriented at a number of angular positions equal to said multiple of four and, in each of said positions said foot will rest on one of the polygonal faces thereof and be supported by said support plate in sable manner, and said cross arm will engage the inside face of said foot and either side of said neck to prevent said anvil head from tipping downwardly, so that as a portion of said anvil becomes worn, said foot and neck may be rotated in said bracket to present a relatively uneroded anvil surface to said outwardly thrown rock.