Traversing hoists – Adjustable to transport or nonuse position – Crane boom supported by foldable or collapsible tower
Reexamination Certificate
2011-06-28
2011-06-28
Brahan, Thomas J. (Department: 3654)
Traversing hoists
Adjustable to transport or nonuse position
Crane boom supported by foldable or collapsible tower
C212S178000, C212S270000
Reexamination Certificate
active
07967158
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. In one method of operation, the counterweight is never supported by the ground during crane pick, move and set operations other than indirectly by the ground engaging members on the carbody. One embodiment includes a counterweight movement structure having a rectangular rack with at least first and third pinion gears engaged with teeth on one side and second and fourth pinion gears engaged with teeth on the opposing side.
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Lanning John M.
Pech David J.
Pleuss Alan E.
Porubcansky Kenneth J.
Brahan Thomas J.
Brinks Hofer Gilson & Lione
Manitowoc Crane Companies, LLC
Shurtz Steven P.
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