HITCH FOR WORKING TOOLS OF SMALL-SIZED SELF-PROPELLED CHASSIS Russian patent published in 1998 - IPC

FIELD: agricultural engineering. SUBSTANCE: hitch has rotary levers 3 and 5 with hydraulic cylinder 4 for rotating levers 3 and 5, auxiliary variable length tie-rods formed as hydraulic cylinders 8 mounted between frame of self-propelled chassis and working equipment 10 so as define, in conjunction with working equipment 10 and tie-rods 3 and 5, pivotal four-link devices for rotating in vertical plane and lifting-lowering. Supporting housing 1 is positioned on frame 7 of chassis. Upper rotary levers 5 are mounted on supporting housing 1 and connected with working equipment 10. Lower rotary lever 3 is connected with hydraulic cylinder 4. When working equipment 10 is in its "lift" position, piston cavities of hydraulic cylinders 4 and auxiliary hydraulic cylinders 8 are communicated one with another and with pressure line of distributor 15, when working equipment 10 is in "lower" position, stem cavities of closed hydraulic cylinders 4 and 8 and hydraulic delivery line are communicated. When working equipment 10 is in its extreme positions, corresponding to transport and charging modes of chassis, cavities of hydraulic cylinders 4 and 8 are locked in neutral position of distributor 15. EFFECT: increased efficiency, wider operational capabilities and enhanced reliability in operation. 3 dwg