REVOLVING WORKING MACHINE, ITS REVOLVING BASE, ITS FRAME COVER, AND MANUFACTURE OF REVOLVING BASE

摘要

PROBLEM TO BE SOLVED: To reduce the coats of materials and fabrication of a revolving base by using the frame covers of revolving frames which are similar in as many aspects as possible for different kinds of revolving working machines which differ in the track of revolution of the revolving base. ;SOLUTION: A revolving frame is rotatably provided on a travel device 2 about a vertical axis, and a revolving base where a frame cover (14L), 14R having a round part 29 on a part thereof is mounted on the outer peripheral part of the revolving frame is provided. The round part 29 of the frame cover (14L), 14R is formed in the same shape as the round part 29 of another frame cover (14L), 14R used in a different kind of revolving working machine which differs in the track of revolution of the revolving base.;COPYRIGHT: (C)1999,JPO