Method and device for stretching and folding a jib for crane.,申请号EP19910103930-传众专利搜索

Method and device for stretching and folding a jib for crane.

申请公布号：EP0460361(A1)

申请号：EP19910103930

申请日期：1991.03.14

申请公布日期：1991.12.11

申请人：

KABUSHIKI KAISHA KOBE SEIKO SHO ALSO KNOWN AS KOBE STEEL LTD.

发明人：KOIZUMI, YUKIO

分类号：B66C23/70

主分类号：B66C23/70

摘要：<p>mechanism for supporting the jib (2) along one side surface of a boom (1) under a vertically disposed condition of the jib where a forward end portion of the jib is directed to a forward end portion of the boom, and opposite flat planes of the jib are oriented horizontally in such a manner that the jib is slidable along the side surface of the boom in a range between a folded position of the jib where a base end portion of the jib is disposed aside a base end portion of the boom and an advance position of the jib where the base end portion of the jib is disposed aside the forward end portion of the boom; a pair of jib supporting shafts (14,15) projecting outwardly from opposite side surfaces of the forward end portion (13) of the boom (1); a pair of connecting portions (24,25) provided at the base end portion of the jib (2) and adapted to be connected to the jib supporting shafts (14,15) upon stretching of the jib (2); and an engaging member (3) provided at a lower end portion of the base end portion of the jib (2) under the vertically disposed condition of the jib in such a manner that the jib is rotatable about a longitudinal axis of the jib. The engaging member (3) is brought into engagement with one (14) of the jib supporting shafts (14,15) projecting from one of the opposite side surfaces of the forward end portion of the boom (1) on the same side as the one side surface of the boom, at the advance position of the jib. <IMAGE></p>