Earth-boring apparatus

Claim 1

A UTILITY-TYPE DIGGER MOUNTED ON A VEHICLE AND CONSTRUCTED AND ARRANGED THEREON FOR SELECTIVE CONNECTION EITHER WITH THE BOOM OR STINGER CARRIED BY THE VEHICLE OR WITH BOTH, SAID DIGGER COMPRISING (A) AN ELONGATED BOOM PIVOTALLY MOUNTED ON SAID VEHICLE, (B) A POWER DRIVEN DIGGER, (C) MEANS CARRIED BY SAID VEHICLE AND CONNECTED TO SAID DIGGER FOR DRIVING THE LATTER, 7D) A STINGER TELESCOPICALLY CARRIED BY SAID BOOM AND BEING EXTENDABLE AND RETRACTABLE RELATIVE THERETO, (E) MEANS CARRIED BY SAID VEHICLE AND OPERATIVELY CONNECTED TO SAID STRINGER FOR EXTENDING AND RETRACTING SAID STINGER RELATIVE TO SAID BOOM, (F) PIVOT SHAFT MOUNTING MEANS ON SAID BOOM, (G) PIVOT SHAFT MOUNTING MEANS ON SAID STRINGER AND SUBSTANTIALLY IN ALIGNMENT WITH THE SAID MEANS ON THE BOOM, (H) A DIGGER-SUPPORTING ARM SUPPORTING SAID DIGGER AND CARRYING PIVOT SHAFT MEANS FOR DISPOSITION EITHER IN THE SHAFT MOUNTING MEANS ON, AND SUPPORTED BY, SAID BOOM WITH THE STINGER IN EXTENDED POSITION, OR FOR DEPOSITION IN THE SHAFT MOUNTING MEANS ON, AND SUPPORTED BY, SAID STRINGER WITH THE STRINGER ALSO IN EXTENDED POSITION, OR FOR DISPOSITION IN THE MOUNTING MEANS ON THE BOOM AND STRINGER WHEN THE STRINGER IS IN RETRACTED POSITION, (J) AND RELEASABLE INTERENGAGING MEANS CARRIED BY SAID BOOM AND SAID DIGGER-SUPPORTING ARM FOR SELECTIVELY MAINTAINING SAID DIGGER IN BOOM AND STRINGER SUPPORTED POSTIONS.