Deep furrow grain drill

Claim 1

A GRAIN DRILL COMPRISING, IN COMBINATION, A FRAME INCLUDING FRONT AND REAR PORTIONS AND HAVING MEANS AT ITS FORWARD END FOR CONNECTION WITH A TOWING VEHICLE, GROUND ENGAGING WHEELS SECURED TO AND SUPPORTING THE FRONT END OF THE FRAME AT TWO POINTS, A SEED BOX RIGIDLY SUPPORTED TRANSVERSELY ON SAID FRAME AND HAVING A PLURALITY OF SEEDING UNITS ASSOCIATED THEREWITH AND SPACED APART TRANSVERSELY OF THE SEED BOX, A LIKE PLURALITY OF PRESS WHEELS JOURNALLED REARWARDLY OF SAID SEEDING UNITS AND FORMING THE SUPPORTING MEANS FOR THE REAR END OF THE DRILL, SINGLE MEANS AT THE CENTER OF THE REAR PORTION OF THE FRAME FORMING A PIVOTAL CONNECTION FOR LATERAL TILTING MOTION WITH RESPECT TO THE GENERAL DIRECTION OF TRAVEL OF SAID FRAME, A SUBSTANTIALLY LATERAL EXTENDING MAIN BEAM CARRIED ON SAID SINGLE PIVOT MEANS, AND A MULTIPLEX EQUALIZER LINKAGE CONNECTED BETWEEN SAID PRESS WHEELS AND SAID PIVOTALLY CONNECTED MAIN BEAM FOR SUPPORTING THE WEIGHT OF THE REAR OF THE DRILL ENTIRELY THROUGH SAID SINGLE PIVOTED CONNECTION WHEREBY THE DRILL MAY TRAVERSE IRREGULAR GROUND WITHOUT IMPOSING TWISTING STRAINS ON THE FRAME AND SEED BOX.