| 摘要 |
PROBLEM TO BE SOLVED: To provide a pin extraction regulation device unable to extract a connection pin for fixing a lateral shake-out type jib in a state of not most reducing a boom.SOLUTION: The present invention is a pin extraction regulation device of a lateral shake-out type jib 3 of a mobile crane having booms 21-26 constituted in a nest shape. The pin extraction regulation device comprises boom side bosses 21a and 21b, jib side bosses 31a and 31b, a connection pin 4 insertably-extractably inserted into the boom side bosses 21a and 21b and the jib side bosses 31a and 31b and connecting the tip boom 21 and the lateral shake-out type jib 3, that is, the connection pin 4 insertably-extractably operated by a rotary jig 9 as connection pin operation means, a twist prevention mechanism for preventing a mutually adjacent boom cylinder from twisting around the boom axis in a state of most reducing a boom 2 and an operation regulation mechanism 7 for making insertion-extraction operation of the connection pin 4 by the rotary jig 9 as the connection pin operation means impossible in a state of not most reducing the boom 2.SELECTED DRAWING: Figure 5 |
