Patent ID: 6248288
Filing Date: 2001-06-19
Classification: C21B

Abstract:
A device for swivelling a working unit between a rest position and an operating position, comprising:a jib to carry the working unit;a supporting structure, in which the jib is pivoted about a swivelling axis at one end;a rotary drive between the jib and the supporting structure for swivelling the jib between its rest position and its operating position; anda hydraulic cylinder between the jib and the supporting structure to generate a contact force;the supporting structure representing a frame and the jib the driven element of a mechanism and the hydraulic cylinder closing this mechanism between the supporting structure and the jib to transmit the contact force to the jib; anda coupling device, which is connected in series to the hydraulic cylinder in such a way that the hydraulic cylinder can be disconnected from the mechanism;wherein the hydraulic cylinder is arranged along the jib, and is carried by the latter and can bear on the supporting structure via the engaged coupling device to transmit a contact force; and further comprisinga swivelling arm, which is pivoted in the supporting structure in such a way that the swivelling arm is pivoted in relation to the supporting structure and the jib about a swivelling axis, which is essentially coaxial with the swivelling axis of the jib, the hydraulic cylinder being connected to the swivelling arm; anda locking device for locking the swivelling arm in relation to the supporting structure;wherein the locking device has a bolt, which can be inserted in the withdrawn from a corresponding hole to lock the swivelling arm in relation to the supporting structure.