Earth boring apparatus

Claim 1

A WORK MECHANISM SUPPORT FOR A VERTICALLY PIVOTAL DERRICK COMPRISING, COLLAR-LIKE MEANS FOR MOUNTING THE SUPPORT ON THE DERRICK BOOM IN GENERALLY ENCOMPASSING RELATION THERETO, MEANS EXTENDING GENERALLY RADIALLY OUTWARDLY FROM THE COLLAR-LIKE MEANS FOR SUSPENDING THE WORK MECHANISM SUCH AS AN EARTH BORING AUGER FROM THE SUPPORT, SAID RADIAL MEANS BEING SUBSTANTIALLY ALIGNED WITH SAID COLLAR-LIKE MEANS IN DIRECTIONS LENGTHWISE AND CROSSWISE OF THE COLLAR-LIKE MEANS, SAID SUPPORT BEING ADAPTED TO APPLY THE DOWNWARD FORCE OF THE BOOM TO THE WORK MECHANISM FOR DIGGING OPERATIONS, SAID COLLAR-LIKE MEANS INCLUDING EXTERIOR, AXIALLY SPACED PAIRS OF FLANGES EXTENDING GENERALLY CIRCUMFERENTIALLY OF SAID COLLAR-LIKE MEANS, THE FLANGES OF EACH OF SAID PAIRS BEING DISPOSED IN DIAMETRICALLY OPPOSED RELATION, WITH THE FLANGES OF ONE OF SAID PAIRS EXTENDING A GREATER CIRCUMFERENTIAL AMOUNT THAN THE FLANGES OF THE OTHER OF SAID PAIRS, SAID FLANGES BEING ADAPTED TO DETACHABLY COUPLE SAID WORK MECHANISM SUPPORT TO THE DERRICK BOOM IN PREDETERMINED POSITIONS OF SAID WORK MECHANISM SUPPORT, AND MEANS PROVIDING FOR ROTARY MOVEMENT OF THE WORK MECHANISM SUPPORT WITH RESPECT TO AND TRANSVERSELY OF THE DERRICK BOOM AND ABOUT THE LENGTHWISE AXIS OF THE BOOM.