WIDE-CUT HEAVY SPRING-TOOTH HARROW Russian patent published in 2013 - IPC A01B19/00 A01B25/00 

FIELD: agriculture.

SUBSTANCE: harrow comprises towing device connected to the frame, transport wheels and impellers. On the rear tube of the frame a middle movable spragger with the working sections is mounted. The middle spragger through the hinge joints in the form of universal joints located at its ends, the side movable spraggers with the working sections are attached. The extreme ends of the side movable spraggers are connected to the front part of the frame with the extensions. The extensions are composed of two parts: the front made short and rear made long. One ends of the front short extensions are fixed to the frame immovably. On the second ends of the front short parts of the extensions the traps and snaps are installed. The mobility of traps and snaps is limited by springs. The springs are mounted on the fingers connecting the snaps with the brackets mounted immovably on the front short parts of the extensions. One ends of the rear long parts of the extensions are movably connected to the "П"-shaped leashes, mounted movably on the frame. The other ends of the rear long parts of the extensions are mounted movably on the extreme ends of the side movable spraggers. In the rear long parts of the extensions next to the vertical axes of their connection to the "П"-shaped leashes the horizontal axes are located. On the fingers of the spring on the side of the snaps the locks are installed, made in the form of corners with recesses. The recesses of the corners before harrowing are engaged with the grooves of the fingers installed directly on the brackets mounted on the front short parts of the extensions.

EFFECT: invention enables to prevent breakage of the extensions when moving the wide-cut heavy harrow on rough roads and to improve in the process of harrowing the quality of tillage by providing a uniform depth of processing, and eliminate the possible folding of such units in the process of technological uplifts of working sections during turns and U-turns.

6 dwg