Patent ID: 7419064

Claim:
A working machine comprising: a lower traveling body; an upper rotating body rotatably mounted on the lower traveling body; and an upper/lower part joining device detachably joining the lower traveling body and the upper rotating body, the upper/lower part joining device including an upper ring provided on the upper rotating body on a lower ring provided on the lower traveling body and sandwiching flange parts formed in each of the both rings by a ring-shaped clamp device, wherein in the upper/lower part joining device, the flange parts are formed to protrude to an inner circumference side of the lower ring and the upper ring, and the clamp device is, while being placed at the inner circumference side of the lower ring and the upper ring, and being separated at four points, a front side, a back side, a left side, and a right side and divided into four divided clamps, at separation points of the front side and the back side, the left and right divided clamps are relatively rotatably connected with each other through first connection members respectively, and at the separation points of the left side and the right side, the each of the front and back divided clamps is connected to single extension/contraction means through second connection members respectively, by an extension/contraction operation of the extension/contraction means, the front and back divided clamps move between joint positions for sandwiching the flange parts of the lower ring and the upper ring and separation positions apart from the flange parts, and if the front and back divided clamps position at the joint positions, spaces of a predetermined length are formed between the front and back divided clamps, and wherein position regulation means for regulating return of the divided clamps to the separation positions are arranged which are, corresponding to the separation points of both of left side and right side of the clamp device, when the front and back divided clamps position at the joint positions respectively, inserted into the spaces between the front and back divided clamps, and the position regulation means are provided to be movable between insertion positions between the front and back divided clamps and wait positions inside the insertion positions.