Patent ID: 7987942
Filing Date: 2011-08-02
Classification: E02F

Abstract:
1. An upper frame of an excavator comprising: a center frame having a bottom plate and a pair of side plates vertically welded to the bottom plate; a left side frame welded to the side plate of the center frame; a right side frame welded to the side plate of the center frame; an upper plate placed in the front of the center frame for supporting a bracket for a working device, to which a boom is pivotally secured; and an extended member integrally extended from one end of the upper plate for supporting desired parts, wherein the extended member and the upper plate are jointed to each other by welding, a welded joint portion formed between the extended member and the upper plate has an inclined angle of 50 to 80 degrees relative to the horizontal direction of the center frame with respect to the side plate; and an outer surface of the welded joint portion between the upper plate and the extended member is flush with an outer surface of the upper plate and an outer surface of the extended member.