A mobile lift crane (610) includes a carbody (612) having moveable ground engaging members (614, 616); a rotating bed (620) rotatably connected to the carbody (612) such that the rotating bed (620) can swing with respect to the ground engaging members (614, 616); a boom (622) pivotally mounted on a front portion of the rotating bed (620); a mast (628) mounted at its first end on the rotating bed (620); a moveable counterweight unit (634); and at least one arm (636) pivotally connected at a first end to the rotating bed (620) and at a second end to a rack and pinion assembly (636). Extension and retraction of the rack and pinion assembly (636) changes the position of the counterweight unit (634) compared to the rotating bed (620).
MOBILE LIFT CRANE WITH VARIABLE POSITION COUNTERWEIGHT
MOBILER HEBEKRAN MIT GEGENGEWICHT MIT VERÄNDERLICHER POSITION
GRUE DE LEVAGE MOBILE AVEC CONTREPOIDS A POSITION VARIABLE
2018-06-06
Patent
Electronic Resource
English