Mobile lift crane with variable position counterweight
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United States of America
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Jan 7, 2025
Grant Date -
Apr 18, 2024
app pub date -
Dec 7, 2023
filing date -
Dec 7, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
A mobile lift crane includes a carbody, moveable ground engaging members, a rotating bed, a boom, a mast, and a backhitch. A linear actuation device is pivotally connected to the rotating bed and a moveable counterweight unit is coupled to the linear actuation device. A tension member is coupled to the mast and to one of the linear actuation device and the moveable counterweight unit. The linear actuation device is operable to move the moveable counterweight unit toward and away from the rotating bed during a pick, move, and set operation by extending the linear actuation device. The mobile lift crane is configured such that the moveable counterweight unit is never supported by the ground other than indirectly by the moveable ground engaging members on the carbody throughout all pick, move, and set operations.
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