HEIGHT ADJUSTMENT MECHANISM FOR AN AUXILIARY MEMBER ON A CRANE

摘要

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 movement device is configured to move the counterweight unit toward and away from the boom. At least one auxiliary member includes a counterweight pad that is configured to not touch the ground during a pick, move, and set operation. A linear actuator is configured to adjust a distance that the counterweight pad is above the ground.

主权项

1. A lift crane comprising:
a) a carbody; b) movable ground engaging members mounted on the carbody allowing the lift crane to move over the ground, the movable ground engaging members including a front tipping fulcrum and a rear tipping fulcrum for the crane; c) a rotating bed having a front portion and a rear-most fixed portion, the rotating bed being rotatably connected to the carbody about an axis of rotation that provides a plane of rotation perpendicular to the axis, the rotating bed including a counterweight support frame ; d) a boom pivotally mounted about a fixed boom hinge point on the rotating bed and including a load hoist line for handling a load; e) a mast connected to the rotating bed; f) a counterweight unit movement device that includes a first linear actuator configured to move a counterweight unit forward of the rear tipping fulcrum; g) at least one auxiliary member that includes a counterweight pad, the auxiliary member being configured such that the counterweight pad does not touch the ground during a pick, move, and set operation; and h) a second linear actuator configured to allow for adjustment of a distance that the counterweight pad is above the ground.