LN BURKOV'S COMBINED HARROW Russian patent published in 2008 - IPC A01B19/02 

FIELD: agriculture.

SUBSTANCE: invention falls into the machinery category and can be used for surface tillage. The harrow includes the frame with teeth attached to it. The teeth are fixed rigidly towards the frame and are made in the form of flat metal strips. The removable tusks, made of antifriction material for example, fluorine, are fixed rigidly to the teeth. The tusks are edged in the lower part on each side and have vertical blind rectangular groove along the axis of symmetry. This groove is used for attaching tusks to the teeth. The teeth are mounted vertically in parallel rows with equal spacing. The left and the right external rows of teeth are located along the whole working width of the harrow. The rest sets of teeth are mounted on the half working width of the harrow and are shifted one-by-one half-pitch relative to each other. The rippers are mounted pivotally on the profile plane of the teeth with equal spacing and are shifted one-by-one half-pitch relative to each other. The rippers are made in the form of flat disks with blades flanged vertically about 25-30 degrees symmetrically one-by-one leftwards and rightwards along the rim. The blades are covered with antifriction material for example, fluorine, on one half of their radius. Radius of the blades makes the fourth part of the nominal tillage depth. In the vertical plane the rippers are shifted relative to each other in such way that the cutting edge of the lower rippers is higher than the tusk's nib at one half of ripper's radius. The axis of the upper rippers is shifted upwards from the tusk's nib at the length of ripper's diameter. The harrow is equipped with the weight pan, the hitch and two pneumatic wheels mounted symmetrically from each side. Such design of the harrow allows increasing quality of tillage.

EFFECT: increase of the tillage quality.

5 dwg