Patent ID: 7445272
Filing Date: 2008-11-04
Classification: E02F

Abstract:
1. An upper frame structure for supporting a cab of construction machinery, including a center frame having a bottom plate on which a swing ring gear is mounted and a pair of side plates which are vertically fixed to the bottom plate and on which operation devices are mounted; and a left frame mounted on a left side of the center frame and having a left side frame on which the cab is mounted, the upper frame structure comprising: at least one reinforcement members each of which has one end fixed by welding to a side surface of the side plate of the center frame and the other end fixed by welding to a side surface of the left side frame, and on which the cab is mounted; and a fastening member installed on the bottom plate to offset a load vertically applied to the cab and a load laterally applied to the cab, and fixing the reinforcement member to the bottom plate, wherein a screw hole is formed on the reinforcement member so that a screw part of the fastening member is fastened into the screw hole.