Patent ID: 7722308

Claim:
A construction machine, comprising: a lower traveling body; an upper rotating body mounted on said lower traveling body rotatably around a vertical axis; a cabin installed on one of left and right sides of an upper frame constructing said upper rotating body; a boom whose base end is attached to said upper frame by a boom foot pin on the inner side of said upper frame relative to said cabin, the boom foot pin being inserted through said boom base end and upper frame in the direction of the axial length of the boom foot pin; at least one operational device installed on said upper frame on a side of said upper frame laterally opposite to said cabin and arranged to provide a pin insertion and removal space along the path of movement of the boom foot pin during inserting of the boom foot pin, which pin insertion and removal space is sufficient for inserting and removing said boom foot pin; a support element fixed relative to said upper rotating body and adapted to pivotally support at least one cover covering a device chamber of said upper rotating body; and a tubular pin guide provided on said support element, and provided in said device chamber and in said pin insertion and removal space, said pin guide having portions engageable with opposing sides of the boom foot pin when the boom foot pin is inserted in the insertion path of movement of the boom foot pin, for guiding said boom foot pin in the insertion path of movement of the boom foot pin.