Mobile lift crane with variable position counterweight
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United States of America Patent
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Aug 20, 2013
Grant Date -
Oct 13, 2011
app pub date -
Jun 21, 2011
filing date -
Oct 27, 2006
priority date (Note) -
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Abstract
A mobile lift crane includes a carbody; a rotating bed; a boom; a moveable counterweight unit; at least one linear actuation device; and at least one arm pivotally connected at a first end to the rotating bed and at a second end to the linear actuation device. The arm and linear actuation device are connected between the rotating bed and the counterweight unit such that extension and retraction of the linear actuation device changes the position of the counterweight unit compared to the rotating bed.
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