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.

Abstract: Each arm of the scissors comprises a handle with a rigid outer ring and an inner ring made of a flexible and elastically deformable material. The flexible inner ring includes a part resembling a length of tube and receiving one or more of a user's fingers, and a thin membrane-like part which connects the preceding part to the rigid outer ring of the handle. This configuration is both comfortable and firm.