EXCAVATING MACHINE Russian patent published in 1995 - IPC

FIELD: road building machines. SUBSTANCE: self-moving chassis of the machine is made in the form of hinged frames 1 and 2. Blade 3 and beam 6 are hinged to front frame 1. Rotary column 7 with support wheel 8 is installed on free end of beam 6. Beam 6 and column 7 have guides 15 and 16 with slide blocks 17 and 18 hinged to one another. Control hydraulic drive has tracking hydraulic cylinder 21 hinged to frame 1 and frame 2. Cavities of hydraulic cylinder 21 related to piston and rod sections are connected to similar cavities in hydraulic cylinder 19 to turn columns 7 and adjusting gas distributor 22. Reciprocal position of frames 1 and 2 is changed at the expense of hydraulic cylinder 23 operation when the machine runs on curvilinear road sections. Hydraulic cylinder 21 takes up change in positions of frames 1 and 2 when hydraulic cylinder 23 affect those. Fluid is displaced from one cavity of hydraulic cylinder 21 and forced into the proper cavity of hydraulic cylinder 19 resulted from above. In so doing rod of hydraulic cylinder 19 moves slide blocks 17 and 18 in guides 15 and 16. This results in turning column 7 with support wheel 8 and excludes its sliding. EFFECT: increased productivity and economy. 4 dwg