REVOLVING MOTION RESTRICTING DEVICE OF BRIDGE INSPECTING VEHICLE

PROBLEM TO BE SOLVED: To provide an revolving motion restricting device for a bridge inspecting vehicle equipped with a vehicle part 1, a revolving table 2, a first boom 3a rising and falling, a revolving member 3c revolving horizontally, a second boom 3d rising and falling, a third boom 3e capable of elongating and buckling, and a working table 4, in which the revolving table 2 and the revolving member 3c can be revolved in such a spreading direction viewed on the plan that the third boom axial line 3e-p goes beyond the parallel condition with the vehicle width direction center line 1-p, and the revolving motion is not necessary for the bridge inspecting operations and may cause a degradation of the stability. SOLUTION: The revolving motions of the revolving table 2 and the revolving member 3c are restricted when the total value of the unilateral inner angles X and Y on the side where the tip of the third boom 3e is positioned among the intersecting angles of the first boom axial line 3a-p viewed on the plan to the vehicle width direction center line 1-p and the third boom axial line 3e-p is going to exceed 180 deg. approximately in the condition that the second boom 3d is in the falling condition and the third boom 3e is not in the condition in the neighborhood of the folded-up position. COPYRIGHT: (C)2004,JPO