Patent ID: 8419339

Claim:
A connecting member for use in a construction machine having a boom and an arm, the connecting member being cast and adapted for connecting the boom and the arm, comprising: a first support plate having a first shaft hole through which an arm pin is inserted; a second support plate disposed parallel to the first support plate and having a second shaft hole through which the arm pin is inserted; and an intermediate support member being continuous with the first and second support plates and disposed between the first and second support plates, a space being formed inside the intermediate support member, wherein the intermediate support member has (i) a bottom plate disposed at a position facing the boom and formed with a draw-out hole for drawing out a casting mold having been used in the cast molding of the connecting member, the draw-out hole having an axis agreeing with a center of the bottom plate, and (ii) a cover plate being continuous with the bottom plate and disposed at a position facing the arm so as to cover the space; and the bottom plate has at least four projections protruding toward the boom on an innermost perimeter edge defining the draw-out hole, the at least four projections each having an inner peripheral wall and an outer peripheral wall and being disposed at four intersecting locations at which the innermost perimeter edge, and two diagonals passing the center of the bottom plate, intersect each other.