| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction machinery having a structure capable of bending a rear leg surely when a gantry is made a lodging state.SOLUTION: A gantry comprises: a front leg 32 whose lower end is rotatably attached to a base machine 12; and a rear leg 34 disposed between an upper end part of the front leg and the base machine. The rear leg comprises: a lower part rear leg 34a whose lower end is rotatably attached to the base machine; and an upper part rear leg 34b whose upper end is rotatably attached to the front leg. The upper end part of the lower part rear leg and the lower end part of the upper part rear leg are coupled so as to be bent freely, on an intermediate coupling part. When the lower part rear leg and the upper part rear leg are extended in a linear state, the gantry becomes a standing state and when the intermediate coupling part is moved in the front leg direction and the rear leg is bent, the gantry becomes a lodging state. Between the base machine and the front leg, a gantry lodging cylinder 37 is provided, and between the front leg and the upper part rear leg, a spring 38 for rear leg bending, is provided. |
