Counterweight block and assemblies for cranes

摘要

A counterweight block (100) includes a plurality of protrusions (124) on a surface thereof and a plurality of recesses on an opposite surface thereof shaped to receive the plurality of protrusions (124) from another identical counterweight block (100); wherein the protrusions (124) and recesses are positioned on the counterweight block (100) so that when a second and a third identical counterweight blocks (100) are positioned side by side, the counterweight block (100) is stackable in one of three positions: (i) on the second counterweight block (100) with the protrusions (124) of the lower block (100) fitting in the recesses of the upper block (100); (ii) on the third counterweight block (100) with the protrusions (124) of the lower block (100) fitting in the recesses of the upper block (100); and (iii) straddling the second and third counterweight blocks (100) with a portion of the protrusions (124) on each lower block (100) fitting into the recesses of the upper block (100). Another counterweight block (100) may include three raised bumps (125) on a first surface thereof configured to come into contact with a generally flat, second surface opposite the first surface of another, identical counterweight block, the three raised bumps (125) providing planar contact of the other, identical counterweight block when stacked thereon.