Lift crane with mast-raising mechanism
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United States of America Patent
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Aug 16, 2016
Grant Date -
Jul 30, 2015
app pub date -
Jan 26, 2015
filing date -
Jan 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A mast-raising mechanism for raising a mast of a mobile lift crane to an operating position includes a hydraulic cylinder extendable to raise the mast. The hydraulic cylinder includes a first end pivotally coupled to a rotating bed of the crane and a second end spaced apart from the first end. A first arm includes a first end pivotably coupled to the second end of the hydraulic cylinder. The hydraulic cylinder extends to press the first end against a bearing surface on the mast. The first arm also includes a second end spaced apart from the first end. A second arm includes a first end proximate the second end of the first arm and a second end spaced apart from the first end. The second end of the second arm is pivotably connected to the rotating bed. A biasing mechanism urges the first arm towards the second arm.
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