HOLEMAKER Russian patent published in 2003 - IPC

FIELD: agricultural engineering. SUBSTANCE: hole maker is made in the form of chain composed of links and fixed on ends of frame. Two plates with openings are positioned on chain links. Blades located in openings are provided with sharpened cutting edge. Plates with shafts are positioned at both sides of chain. Each shaft is fixed in bearing unit. Casing of bearing unit is positioned for rotation in folk slots with fastening plate by means of stops. Shaft is positioned in folk opening for free rotation inside bushing located in triangular tie-rod pivotally connected to beam. Beam may be hitched through connecting plates to agricultural tools. Openings for receiving retaining screw are made in eyelet of triangular tie-rod of beam. EFFECT: simplified construction and enhanced reliability in operation. 2 cl, 4 dwg