Potain

Potain (societe Anonyme)

Yves Millet

Michel Lissandre

Philippe Monteil

The device combines ballast blocks () that can be stacked onto a base frame of the crane, and a gripper () for handling these blocks, the gripper being designed to be connected, during use, to a handling means. This device comprises means of nonpermanent connection, by hooking, between the gripper () and a ballast block () and means () for centering the stacked ballast blocks () relative to one another. The aforementioned connection means are constituted by two opposed gripping hooks () mounted pivotably at the ends of a lifting beam () of the gripper () and interacting with transverse pins () of a block (). The rear part of each hook () is attached to a sling (), and a lock () is assigned to it. The invention applies in particular to the ballasting of tower cranes.

Ballasting device for a crane

The invention relates to the mounting of the revolving part of a tower crane, at the top of the mast. A first assembly, formed by the counterjib ( ), its tie rod ( ) and a rear part ( ) of the jib bearer ( ), made in two separable parts, is pre-built on the ground, then lifted up and assembled by pinning (at ) on the revolving pivot or the mast-cab ( ) and is held temporarily in place by retaining link rods ( ). Another assembly, formed by the jib ( ), its tie rods ( ) and the front part ( ) of the jib bearer, is also pre-built on the ground, then lifted up and assembled by pinning (at ) on the revolving pivot or the mast-cab ( ). The respective tops ( ) of the front part ( ) and of the rear part ( ) of the jib bearer ( ) are then joined together by temporary pinning along an axis ( ), followed by definitive pinning along an axis ( ).

Method and device for mounting the masthead of tower cranes

The device provides dismantlable assembly between the top of the upper element of the mast of a tower crane and the fixed pivot which serves to support and to orientate the rotating upper part of the crane comprising the jib. Fishplates are fixed at the four corners of the pivot, of square horizontal section, in the direction of the diagonal, the fishplates lying within the permissible size for transporting this pivot. Other fishplates are fixed to the four corners of the top of the mast element, on the inside of the uprights of this element. The fishplates have holes which come into alignment, and through which removable connecting pins are fitted.

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Moulins, France

Yves Millet