- 专利标题: LIFT CRANE WITH IMPROVED MOVABLE COUNTERWEIGHT
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申请号: US17552279申请日: 2021-12-15
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公开(公告)号: US20220106170A1公开(公告)日: 2022-04-07
- 发明人: David J. Pech , Joseph R. Rucinski , Joel D. Zick , Bronson E. Foust , Charles E. Wernecke
- 申请人: Manitowoc Crane Companies, LLC
- 申请人地址: US WI Manitowoc
- 专利权人: Manitowoc Crane Companies, LLC
- 当前专利权人: Manitowoc Crane Companies, LLC
- 当前专利权人地址: US WI Manitowoc
- 主分类号: B66C23/76
- IPC分类号: B66C23/76
摘要:
A lift crane includes a carbody and movable ground engaging members mounted on the carbody. A rotating bed is rotatably connected to the carbody and includes a counterweight support frame including a rack coupled directly to a lower surface of the rotating bed. A boom is pivotally mounted to the rotating bed. A counterweight unit includes a trolley, the counterweight unit being in a movable relationship with respect to the rotating bed. A counterweight unit movement device is configured to move the counterweight unit toward and away from the boom. Other embodiments include a counterweight support beam movably connected to the rotating bed, the counterweight support beam including another rack coupled to a lower surface of the counterweight support beam. A counterweight support beam movement device is connected between the counterweight support beam and the counterweight support frame.