Portable derricks with adjustably mounted earth boring apparatus

Claim 1

A PORTABLE DERRICK COMPRISING A BASE, PIVOT MEANS MOUNTED ON THE BASE, A BOOM PIVOTALLY MOUNTED ON THE PIVOT MEANS, A STINGER OPERATIVELY ASSOCIATED WITH THE BOOM AND BEING EXTENSIBLE WITH RESPECT THERETO, AN ACCESSORY DEVICE PIVOTALLY MOUNTED ON THE BOOM AND BEING ADAPTED TO SWING FROM A TRANSPORT POSITION, WHERE IT LIES IN JUXTAPOSED POSITION WITH RESPECT TO THE BOOM, TO AN OPERATIVE POSITION, WHERE IT EXTEND IN A POSITION SUBSTANTIALLY PERPENDICULAR TO THE GROUND, SAID ACCESSORY DEVICE INCLUDING A ROTATABLE SHAFT AND A MOTOR OPERATIVELY ASSOCIATED THEREWITH FOR POWERING SAID ROTATABLE SHAFT, AND A CABLE MOUNTED ON SAID BOOM AND BEING OPTIONALLY ATTACHABLE TO SAID ROTATABLE SHAFT, IN SUCH A MANNER THAT WHEN THE SHAFT ROTATES THE CABLE WILL WIND UP AROUND THE SHAFT AND BECOME PROGRESSIVELY SHORTER IN LENGTH, SAID MOTOR BEING THEREBY CAPABLE OF WITHDRAWING SAID ACCESSORY DEVICE TO ITS TRANSPORT POSITION WHEN SAID CABLE IS ATTACHED TO SAID SHAFT.