US 12,187,587 B2
Mobile lift crane with variable position counterweight
David J. Pech, Manitowoc, WI (US); and Kenneth J. Porubcansky, Whitelaw, WI (US)
Assigned to GROVE U.S. L.L.C., Shady Grove, PA (US)
Filed by GROVE U.S. L.L.C., Shady Grove, PA (US)
Filed on Dec. 7, 2023, as Appl. No. 18/532,256.
Application 16/417,442 is a division of application No. 14/665,886, filed on Mar. 23, 2015, granted, now 10,336,589, issued on Jul. 2, 2019.
Application 18/532,256 is a continuation of application No. 17/496,106, filed on Oct. 7, 2021, granted, now 11,884,522.
Application 17/496,106 is a continuation of application No. 16/949,717, filed on Nov. 11, 2020, abandoned.
Application 16/949,717 is a continuation of application No. 16/417,442, filed on May 20, 2019, granted, now 10,865,079, issued on Dec. 15, 2020.
Application 14/665,886 is a continuation of application No. 13/963,993, filed on Aug. 9, 2013, granted, now 8,985,353, issued on Mar. 4, 2015.
Application 13/963,993 is a continuation of application No. 13/165,287, filed on Jun. 21, 2011, granted, now 8,511,489, issued on Aug. 20, 2013.
Application 13/165,287 is a continuation of application No. 12/023,902, filed on Jan. 31, 2008, granted, now 7,967,158, issued on Jun. 28, 2011.
Application 12/023,902 is a continuation in part of application No. 11/733,104, filed on Apr. 9, 2007, granted, now 7,546,928, issued on Jun. 16, 2009.
Claims priority of provisional application 60/863,265, filed on Oct. 27, 2006.
Prior Publication US 2024/0124276 A1, Apr. 18, 2024
Int. Cl. B66C 23/76 (2006.01)
CPC B66C 23/76 (2013.01) 20 Claims
OG exemplary drawing
 
1. A mobile lift crane comprising:
a carbody including moveable ground engaging members;
a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members;
a boom pivotally mounted on a front portion of the rotating bed;
a mast mounted on the rotating bed at a first end of the mast;
a backhitch coupled to the mast and the rotating bed;
a linear actuation device pivotally connected to the rotating bed;
a moveable counterweight unit coupled to the linear actuation device;
a tension member coupled to the mast and to one of the linear actuation device and the moveable counterweight unit; and,
wherein the linear actuation device is operable to move the moveable counterweight unit toward and away from a front portion of the rotating bed during a pick, move, and set operation by extending the linear actuation device.