Lift crane with moveable counterweight
Number of patents in Portfolio can not be more than 2000
United States of America
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Mar 1, 2022
Grant Date -
Feb 27, 2020
app pub date -
Oct 28, 2019
filing date -
Oct 28, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A lift crane includes a carbody; a rotating bed comprising a counterweight support frame; a boom; a counterweight unit supported on the counterweight support frame in a moveable relationship with respect to the counterweight support frame; and a counterweight unit movement device connected between the rotating bed and the counterweight unit to move the counterweight unit toward and away from the boom. The crane is configured such that during crane operation, the moment generated by the counterweight unit acts on the rotating bed predominantly through the counterweight support frame. Alternatively, the crane can include a mast. In some embodiments the same basic crane is configured to be set-up with two different counterweight options, i) a counterweight unit directly supported on the counterweight support frame and ii) a counterweight support beam moveably connected to the remainder of the rotating bed and a counterweight unit supported on the counterweight support beam.
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