| 摘要 |
The present invention has a purpose for preventing a collision between a crane boom and a head unit and eliminating damage of the crane boom during parking by using a kinematic linkage structure or hydraulic linkage equipment which is installed on the head unit of a boom rest and operated only when parking the crane boom. The present invention for achieving the purpose comprises: a movable member (24) installed to be moved for the head unit (22) of the boom rest (20), so as to be moved when touching the crane boom (16); a supporting member installed to be rotated for the head unit (22) of the boom rest (20) to change the location toward a mounting region for the crane boom (16) when parking the crane boom (16); and a lever member (28) installed to be rotated for the head unit (22) of the boom rest (20) to enable the linkage by a link connection between the movable member (24) and the supporting member (26). |
