Patent ID: 6296419
Filing Date: 2001-10-02
Classification: B66C,Y10T

Abstract:
A device providing a connection between a pivot and a mast structure for tower cranes, the device providing dismantlable assembly between, on the one hand, the top of the mast of a tower crane, made up of mast elements of square horizontal section and, on the other hand, a fixed pivot, an envelope section having square overall shape and which serves to support and to orientate the rotating top part of the crane, comprising in particular the jib, which device comprises, in combination:at each of the four comers of the pivot, at least one fishplate fixed in a vertical plane passing through a diagonal of the square horizontal section of the pivot, or parallel to this diagonal, each fishplate being pierced with at least one hole of horizontal axis, and all of the fishplates of the pivot lying within the permissible size for transporting this pivot;at each of the four corners of the top of the upper mast element, at least one other fishplate fixed to the upper part of a comer member or upright of this mast element, on the inside of the upright, in a vertical plane passing through a diagonal of the square horizontal section of the mast element or parallel to this diagonal, each fishplate being pierced with at least one hole of horizontal axis, and all of the fishplates of the mast element lying inside the volume delimited by the four lateral faces of the mast element, andremovable horizontal connecting pins designed to be engaged through the holes in the fishplates of the pivot and the holes in the fishplates of the mast element, these holes coming into alignment at each of the four comers when the pivot is placed on the top of the mast element.