POWER SHOVEL Russian patent published in 1994 - IPC

FIELD: excavating and earth-moving machinery. SUBSTANCE: power shovel has scooping mechanism consisting of lifting and crowding mechanisms driven through gear train in form of toothed segments engaging with driving gears. When lifting mechanism drive is cut for lifting and crowding mechanism drive for crowding, dipper lip of bucket moves along trajectory of scooping. Crowding mechanism provides adjustment of dipper lip penetration. Approximately in the middle of scooping operation, crowding mechanism changes direction of motion from crowding to retract providing combined scooping by means of lifting and crowding mechanisms. EFFECT: increased capacity, enhanced reliability, reduced operating costs. 5 cl, 9 dwg