| 摘要 |
PURPOSE:To improve maximum suspending capability of a crane as compared with external size of an automobile, by crossing a safety limit circle, determined from a position of the center of gravity in the whole unit of a truck crane containing a hanging load, with a center line connecting both side jacks of an overhung rear outrigger. CONSTITUTION:In an extended position of front and rear outriggers, a center line 12 connecting both side jacks 8 in a side of the rear outrigger and a center line 13 connecting both side jacks 11 in a side of the front outrigger are set to cross a safety limit circle 14 determined from a position of the center of gravity in the whole unit of a truck crane containing a hanging load. While a turn arm 15 is turnably and pivotally mounted to the rear end of a car body, and a rear end jack 17 is vertically mounted to a point end of the arm 15. Then the turn arm 15 is fixed to an overhung position by a connecting lever 18. In this overhung position, the jack 17 is arranged on an intersection between tangents 21, 22 drawn from centers of the jacks 8 to a circle 20 positioned concentrically with the circle 14 further inscribed to center lines 19 connecting the jacks 8, 11. |
