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公开(公告)号：US20210053802A1
公开(公告)日：2021-02-25
申请号：US16949717
申请日：2020-11-11
IPC分类号： B66C23/76
摘要： 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. In one method of operation, the counterweight unit is never supported by the ground during crane pick, move and set operations other than indirectly by the ground engaging members on the carbody.
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公开(公告)号：US10336589B2
公开(公告)日：2019-07-02
申请号：US14665886
申请日：2015-03-23
IPC分类号： B66C23/76
摘要： 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. In one method of operation, the counterweight unit is never supported by the ground during crane pick, move and set operations other than indirectly by the ground engaging members on the carbody.
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公开(公告)号：US20200062558A1
公开(公告)日：2020-02-27
申请号：US16666130
申请日：2019-10-28
发明人： David J. Pech , Joseph R. Rucinski
IPC分类号： B66C23/76
摘要： 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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公开(公告)号：US10457530B2
公开(公告)日：2019-10-29
申请号：US13712774
申请日：2012-12-12
发明人： David J. Pech , Joseph R. Rucinski
摘要： A lift crane includes a carbody; moveable ground engaging members; a rotating bed rotatably connected to the carbody; and a boom pivotally mounted on the rotating bed. The crane is configured for assembly in at least two configurations. In the first configuration, the crane further includes a live mast; a first counterweight support frame; and a first movable counterweight unit moveably connected to and supported by the first counterweight support frame. In the second configuration, the crane further includes a lattice mast; a second counterweight support frame; a moveable counterweight support beam coupled to the second counterweight support frame and operable to move relative to the second counterweight support frame; and a second moveable counterweight unit moveably connected to the moveable counterweight support beam.
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公开(公告)号：US11261064B2
公开(公告)日：2022-03-01
申请号：US16666130
申请日：2019-10-28
发明人： David J. Pech , Joseph R. Rucinski
摘要： 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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公开(公告)号：US20220024732A1
公开(公告)日：2022-01-27
申请号：US17496106
申请日：2021-10-07
IPC分类号： B66C23/76
摘要： A mobile lift crane includes a carbody, movable ground engaging members, a rotating bed, and a boom. A first structure is pivotally coupled to the rotating bed. A second structure is pivotally coupled to the first structure at a first end of the second structure. A moveable counterweight unit is coupled to a second end of the second structure. A linear actuation device moves the moveable counterweight unit toward and away from the rotating bed during a pick, move, and set operation by retracting and extending the linear actuation device, respectively. The moveable counterweight unit is never supported by the ground other than indirectly by the moveable ground engaging members. The linear actuation device moves the movable counterweight unit a greater horizontal distance from the rotating bed than a distance of a stroke of the linear actuation device that causes the moveable counterweight unit to move.
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公开(公告)号：US20220119232A1
公开(公告)日：2022-04-21
申请号：US17561164
申请日：2021-12-23
发明人： David J. Pech , Joseph R. Rucinski
IPC分类号： B66C23/76
摘要： 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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