Patent ID: 7665801

Claim:
A structure of an upper frame 100 for supporting a cabin of construction machinery, including a center frame 120 having a lower plate 122 and a lateral plate 124 vertically mounted on the lower plate 122 and fitted with operation devices comprising at least one of a boom 3 , an arm 5 , and a bucket 6 , a left frame 130 mounted on the left side of the center frame 120 comprising a side channel 132 extended in a longitudinal direction of the center frame 120 and a plurality of side frames 134 for connecting the center frame 120 with the side channel 132 , the upper frame structure 100 further comprising: a first cabin supporting structure 150 installed between the side frames 134 , for supporting a vertical load and a rearward load applied to the cabin; and a second cabin supporting structure 170 extending in the longitudinal direction of the center frame mounted on one side of the side channel 132 , for supporting an upper surface of the side channel 132 ; wherein the first cabin supporting structure 150 comprises a transverse member 152 formed of a flat plate distant from the side frames 134 and attached with the lateral plate 124 which has a height similar to a horizontal surface of the side frame 134 , and a vertical member 154 is fixed to the lower plate 122 of the center frame 120 for supporting the transverse member 152 , and wherein the second cabin supporting structure 170 comprises an angled vertical plate 172 fixed to an inner vertical surface of the side channel 132 and a horizontal plate 174 fixed to the bottom of the horizontal surface of the side channel 132 to reinforce the strength of the horizontal surface, thereby supporting a vertical load and a rearward load applied to the cabin.