| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem wherein various transportation units obtained by disassembling a large crane to individual components for transportation may be transported on road using a specific transportation vehicle and rules on weight and dimension are applied to the road transportation. <P>SOLUTION: In a rotary joint for rotatable connection of an upper structure with a lower structure of a crane, the upper structure and lower structure are interconnected by a quick-release coupling. This enables safe and prompt attachment or detachment of the rotary joint. <P>COPYRIGHT: (C)2010,JPO&INPIT |
