Oil well drilling apparatus with selfraising drawworks support

Claim 1

IN OIL WELL DRILLING APPARATUS, A GAIN POLE PROVIDED WITH FORWARDLY AND UPWARDLY INCLINED REAR LEGS FORMING A TRACK, AN UPRIGHT MAST DISPOSED AGAINST THE FRONT OF THE GIN POLE, A CROWN BLOCK SUPPORTED BY THE MAST, A TRAVELING BLOCK IN THE MAST, A LINE SUSPENDING THE TRAVELING BLOCK FROM THE CROWN BLOCK AND ALSO EXTENDING DOWN THE BACK OF THE MAST, A SUPPORT EXTENDING REARWARDLY FROM THE BOTTOM OF THE GIN POLE, DRAWWORKS RIGIDLY MOUNTED ON SAID SUPPORT AND OPERATIVELY CONNECTED TO THE LOWER END OF SAID LINE, WHEELS MOUNTED ON SAID SUPPORT AND ENGAGING SAID LEGS FOR ROLLING UP AND DOWN THEM, SHEAVE MEANS SUPPORTED BY THE MAST ABOVE THE GIN POLE, A SLING EXTENDING AROUND SAID SHEAVE MEANS AND CONNECTED TO THE TRAVELING BLOCK AND DRAWWORKS SUPPORT FOR MOVING THE SUPPORT UP SAID LEGS WHEN THE DRAWWORKS IS OPERATED TO RAISE THE TRAVELING BLOCK IN THE MAST, AND MEANS FOR DETACHABLY SECURING THE RAISED SUPPORT TO THE UPPER PART OF THE GIN POLE WIH THE MAJOR PORTION OF THE SUPPORT OVERHANGING THE BACK OF THE GIN POLE.