PLOW Russian patent published in 1994 - IPC

FIELD: plows. SUBSTANCE: plow has base, two fixed cutter groups, extensible cutting head, supporting plate and device for adjustment of position of extensible cutting head according to bed thickness. Extensible cutting head is located between fixed cutter groups and installed for motion in tubular guide. Device for adjustment of position of extensible cutting head is made in form of vessel with ballast and central hole to pass tubular guide, lead blocks and rope lengths. One end of each rope is attached to lower end of extensible cutting head, the other rope end is connected with vessel. Ropes bend round respective lead blocks. Tubular guide is attached to supporting plates and has through recesses to pass culm. Vessel is installed for longitudinal motion relative to tubular guide. EFFECT: higher efficiency. 5 dwg