REVOLVING FRAME OF REVOLVING WORKING MACHINE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To reduce the costs of materials and fabrication of a revolving frame by using the same shape of the longitudinal ribs of the revolving frame for different kinds of revolving working machines which differ in the track of revolution. ;SOLUTION: A revolving frame has a frame base 13A rotatably provided on a travel device about a vertical axis and longitudinal ribs 39, 40 secured on the frame base 13A. In that case, each of the longitudinal ribs 39, 40 used has a portion 41 of the same shape as each longitudinal rib 39, 40 used in a different kind of revolving working machine which differs in the track of revolution.;COPYRIGHT: (C)1999,JPO