A lift crane includes a carbody and movable ground engaging members mounted on the carbody. A rotating bed is rotatably connected to the carbody and includes a counterweight support frame including a rack coupled directly to a lower surface of the rotating bed. A boom is pivotally mounted to the rotating bed. A counterweight unit includes a trolley, the counterweight unit being in a movable relationship with respect to the rotating bed. A counterweight unit movement device is configured to move the counterweight unit toward and away from the boom. Other embodiments include a counterweight support beam movably connected to the rotating bed, the counterweight support beam including another rack coupled to a lower surface of the counterweight support beam. A counterweight support beam movement device is connected between the counterweight support beam and the counterweight support frame.
LIFT CRANE WITH IMPROVED MOVABLE COUNTERWEIGHT
HEBEKRAN MIT VERBESSERTEM BEWEGLICHEM GEGENGEWICHT
GRUE DE LEVAGE À CONTREPOIDS MOBILE AMÉLIORÉ
2019-07-17
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |