FIELD: mechanical engineering. SUBSTANCE: linkage device is intended for maintaining permanent uniform incline of working tool relative to mobile undercarriage irrespective of degree of lifting and lowering. Device has lifting lever unit installed together with working tool on mobile undercarriage with possibility of turning; also working tool incline unit with two parallel links and first and second levers which with their ones ends are fixed for possible turning on aforesaid parallel links, and with their other ends fixed on turning axle connected with mobile undercarriage. Other ends of parallel links are connected to working tool with possibility for turning. Also provided is mechanism for independent turning of first and second levers. EFFECT: high efficiency. 15 cl, 11 dwg
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