Counterweight block and assemblies for cranes

摘要

A counterweight block apparatus includes a pair of interconnecting counterweight blocks having top and bottom surfaces, the counterweight blocks forming a plane of interconnection along adjacent sides thereof; and a shear bar releasably secured between the adjacent sides of the interconnecting counterweight blocks, generally perpendicular to the plane of interconnection, to provide resistance to relative vertical movement of the interconnecting counterweight blocks along the plane of interconnection. In another aspect, each counterweight block includes in at least one side thereof an indentation from a top of the counterweight block to a depth more shallow than the thickness of the counterweight block, the indentation defining a lip for hand grabbing. An aperture may be formed through the rest of the thickness of the counterweigh block at each indentation, wherein a securing strap can be run through each aperture of a stacked plurality of counterweight blocks to secure them to each other.

主权项

1. A counterweight block apparatus comprising:
a) a pair of interconnecting counterweight blocks, each counterweight block having a top and a bottom surface, a first side, two opposing second sides located externally to the counterweight blocks, a lifting lug on one of the second sides and another lifting lug on the other of the second sides, the counterweight blocks being interlocking directly to each other along adjacent first sides thereof, and the first and second sides being narrower than the top and bottom surfaces; and b) a shear bar configured to be releasably secured between the adjacent first sides of the interconnecting counterweight blocks, generally perpendicular to the plane of interconnection, the shear bar being configured to provide resistance to relative vertical movement of the interconnecting counterweight blocks along the plane of interconnection when the interconnecting counterweight blocks are lifted via the lifting lug and the another lifting lug on each counterweight block; wherein each of the interconnecting counterweight blocks includes a longitudinal cavity in at least one of the second sides thereof, wherein the longitudinal cavities coincide to form a single, longitudinal cavity between the interconnecting counterweight blocks depressed within a surface of the at least one of the second sides; and, wherein the shear bar is inserted within the single longitudinal cavity.