| 摘要 |
PROBLEM TO BE SOLVED: To provide a revolving frame of construction machinery, which can prevent damage to a cab bed even in the installation of a swinging working device, and can reduce the number of man-hours for welding by simplifying a structure. SOLUTION: In the revolving frame of the construction machinery, swing posts 6 are turnably journaled to bosses 7 which are provided at the front ends of a pair of vertical plates 2C and 2D, so as to be turned by using a swing cylinder 10. The revolving frame of the construction machinery is constituted by being split into a plurality of frames 2, 3, 4 and 5 comprising: a center frame 2 which is arranged in a central part and has a bottom plate 2A and the vertical plates 2C and 2D; a left side frame 5 which is arranged on the left side of the vertical plates 2C and 2D so as to be partially superposed on the bottom plate 2A of the center frame 2 and wherein the cab bed 8 is installed so as to support an operator cab; and a right side frame 4 which is arranged on the right side of the vertical plates 2C and 2D. The cab bed 8 is installed so as not to be placed on the center frame 2 and so as to be separated from the center frame 2 without being welded to the center frame 2. COPYRIGHT: (C)2004,JPO&NCIPI
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