Patent ID: 7500532

Claim:
A swivel work machine comprising: a traveling unit; a swivel base plate supported on the traveling unit to be pivotable about a vertical swivel axis, said swivel base plate having a first lateral side and a second lateral side provided across said vertical swivel axis; a pair of upper and lower support brackets facing to each other in a vertical direction and disposed with an offset toward said first lateral side, said support brackets being adapted for supporting an implement so that said implement is pivotable to the right or left about a vertical axis; a pair of left and right vertical ribs extending rearward from the support brackets and fixed to the swivel base plate; and a cabin mounted on the swivel base plate; wherein said cabin is disposed with an offset toward said second lateral side relative to the support brackets and disposed rearwardly of front ends of the respective support brackets, a bottom of the cabin being disposed downwardly of the upper support bracket, and disposed downwardly of an upper end of one vertical rib disposed closer to the second lateral side in a region extending from a front portion through an intermediate portion of the one vertical rib; and said region of the one vertical rib extends parallel with a side face of the cabin disposed closer to the first lateral side.