Rotary bearing structure for the cantilever support of the load distribution arm of tower cranes for building and similar

摘要

Rotary bearing structure for the cantilever support of the load distribution arm of tower cranes for building and similar of the type in which at the top of the tower is a horizontal cantilever arm, a counter-arm opposed to the arm and, integral with a rotation device, both a counterweight and an operating cab sustained by said counter-arm, as well as the linkage and a strut for supporting the arm and relative counter-arm; according to the invention, this structure is composed of a counter- arm integral with said rotation device and arranged with an upward inclination so as to be divergent with respect to the arm bearing the load, said counter-arm bearing the counterweight, the mechanisms and the cab not only carrying out the function of bearing structure, but also of strut for at least one tie stretched directly between the free end of the inclined strut itself and said arm for the support and distribution of the load. IMAGE