Patent ID: 11919752
Assignee: MANITOWOC CRANE GROUP FRANCE
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A securing method for a tilting jib crane to secure an angular position of a tilting jib, the tilting jib being displaceable in lifting and in lowering by a tilting winch comprising a tilt motor driving a drum on which is wound a tilting rope coupled to the tilting jib, the drum being secured in rotation with a locking platen provided with locking holes circumferentially distributed, the securing method implementing a locking phase in which a lock is displaced:
from a release configuration in which said lock is disengaged from the locking platen to authorize the rotation of the drum and thus allow lifting/lowering of the tilting jib, and
to a locking configuration in which said lock is engaged inside one of the locking holes, after alignment, to block the rotation of the drum and thus secure the angular position of the tilting jib,
wherein the locking holes are all oblong arcuate shaped so that the lock is engaged with a circumferential clearance within a locking hole in the locking configuration,, wherein the securing method further comprises:
measurement of a speed parameter representative of an angular speed of displacement of the tilting jib, in lifting or in lowering;
first control of the tilt motor to displace the tilting jib in lifting or in lowering, with a limitation of the speed parameter to a first maximum speed value and a limitation of a motor torque of the tilt motor to a first torque limit value, until a given angular position of the tilt jib is reached, in which the lock is aligned with one of the locking holes of the locking platen, the lock occupying the release configuration;
implementation of the locking phase by displacing the lock from the release configuration to the locking configuration; and
second control of the tilt motor to displace the tilting jib in lowering, with a limitation of the speed parameter to a second maximum speed value, which is lower than the first maximum speed value, and a limitation of the motor torque of the tilt motor to a second torque limit value, which is lower than the first torque limit value, until that the speed parameter is zero for a predetermined time period to stop the tilt motor.