Device for placing a tower crane in weathervaning mode
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United States of America Patent
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-
Dec 13, 2011
Grant Date -
Dec 17, 2009
app pub date -
May 13, 2009
filing date -
May 21, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The crane includes a rotating part composed of a jib and of a counterjib, and a mechanism for slewing the rotating part that has at least one geared motor unit with a motor and reduction gear, and an internal main brake which is deactivated when the crane is placed out of service, in order to allow the rotating part to slew freely according to the direction of the wind. The geared motor unit also includes an internal auxiliary brake which is interposed between the motor and the reduction gear and which is activated when the crane is placed out of service in order to exert on the rotating part a braking torque which avoids uncontrolled rotation of said part when placed in weathervaning mode. The auxiliary brake can be designed to exert an adjustable braking torque.
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