PERFECCIONAMIENTOS EN MAQUINAS EXCAVADORAS Y SIMILARES DES- TINADAS A LA CONSTRUCCION.

摘要

A construction machine having a platform rotatable thereon and supporting a boom is disclosed herein. A counterweight is removably secured to the platform by mounting means that includes a pair of bearing hangers received in recesses in the counterweight with removable pins extending through counterbores in the counterweight and openings in the bearing hangers. Adjustable positioning means on the platform engage the counterweight to accurately align the counterbores and the openings. The construction machine also includes hydraulic rams that are carried by the platform and have hooks on extensible elements which receive permanent cross pins located in the recesses so that the hydraulic rams can be utilized to raise and lower the counterweight with respect to the platform.