Patent ID: 7748485

Claim:
An upper frame for construction equipment mounted to swing on a lower driving structure and provided with a working device fixed thereto, comprising: a base plate on which driving means for swinging the upper frame is mounted; left and right side plates vertically welded on the base plate to face each other and composed of inner and outer vertical plates to which a boom and a boom cylinder are rotatably fixed by fixing pins, respectively; and a joint connection plate having both sides welded on inner sides of the inner vertical plates and a lower end part welded on the base plate, and supporting the left and right side plates by exhibiting rigidity and flexibility when reaction load from the boom is generated on the fixing pins due to load generated on the working device during working, wherein the joint connection slate is composed of a lower joint connection plate welded on the base plate and the inner vertical plates, and an upper joint connection plate welded on the inner vertical plates.