Method for controlling the slewing movement of the rotary part of a tower crane
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 7, 2012
Grant Date -
Jan 14, 2010
app pub date -
May 13, 2009
filing date -
May 22, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary part of a crane is associated with an electric slewing mechanism including at least one geared electric motor unit of which the electric motor is powered in such a way as to produce a slewing torque having a certain maximum value. When the crane is in use and for conditions such as windspeed greater than a given value, jib length greater than a given value and moment of the lifted load greater than a given value, the maximum value of a slewing torque produced by the electric motor is increased. The crane thus becomes easier to drive, particularly in the phases during which the jib is adopting a “windward trend”.
First Claim
Other Claims data not available
