System and method for remote setting of a tension in a crane transfer cable

A crane comprising:

• a transfer carriage displaceable along a transfer jib by means of a transfer cable, and
• a tension setting system for a remote setting of a tension in the transfer cable ensuring a displacement of the transfer carriage displaceable along the transfer jib, said tension setting system comprising:
• a transfer winch equipped with a transfer motor and cooperating with the transfer cable so as to ensure a displacement of the transfer carriage in a forward direction and in a backward direction;
• a pilot unit connected to the transfer motor to remotely pilot a displacement of the transfer carriage in the forward direction and in the backward direction;
• and
• a setting mechanical device mounted on the transfer carriage and adapted to be actuated by the action of a displacement of the transfer carriage, said setting mechanical device being coupled to the transfer cable and configurable between:
• a working configuration in which the setting mechanical device stands still irrespective of the displacement of the transfer carriage and results in a holding of the tension in the transfer cable;
• and
• a detent configuration in which, by the action of a displacement of the transfer carriage piloted by the pilot unit according to a predefined first sequence of reciprocating displacement between the forward direction and the backward direction, the setting mechanical device results in a release of the tension in the transfer cable.

A tension setting method for a remote setting of a tension in a transfer cable ensuring a displacement of a transfer carriage displaceable along a transfer jib of a crane, the crane having a tension setting system comprising:

• a transfer winch equipped with a transfer motor and cooperating with the transfer cable so as to ensure displacement of the transfer carriage in a forward direction and in a backward direction;
• a pilot unit connected to the transfer motor to remotely pilot displacement of the transfer carriage in the forward direction and in the backward direction;
• and
• a setting mechanical device mounted on the transfer carriage and adapted to be actuated by the action of displacement of the transfer carriage, said setting mechanical device being coupled to the transfer cable and configurable between:
• a working configuration in which the setting mechanical device stands still irrespective of the displacement of the transfer carriage and results in a holding of the tension in the transfer cable;
• and
• a detent configuration in which, by the action of a displacement of the transfer carriage piloted by the pilot unit according to a predefined first sequence of reciprocating displacement between the forward direction and the backward direction, the setting mechanical device results in a release of the tension in the transfer cable,
• said tension setting method implementing a detent operation for a release of tension in the transfer cable, the method comprising:
• a configuration of the setting mechanical device in the detent configuration, followed by
• a piloting by the pilot unit of the displacement of the transfer carriage according to the first sequence of displacement to act on the setting mechanical device and result in a release of the tension in the transfer cable.