Universal supporting and driving apparatus for pipe subjected to threading

Claim 1

IN APPARATUS OF THE CHARACTER DESCRIBED, THE COMBINATION COMPRISING (A) A CENTRALLY HOLLOW CARRIER HAVING A HORIZONTAL CENTRAL AXIS OF ROTATION AND A FIRST BEARING STRUCTURE BY WHICH THE CARRIER IS SUPPORTED FOR ROTATION; (B) A SERIES OF ELONGATED PIVOT MEMBERS DEFINING PIVOT AXES CIRCULARLY SPACED ABOUT SAID CENTRAL AXIS AND EXTENDING PARALLEL THERETO, THE CARRIER SUPPORTING THE MEMBERS TO PIVOT RELATIVE THERETO AND ABOUT SAID PIVOT AXES; (C) A FIRST SET OF WORK GRIPPING JAWS HAVING DRIVEN CONNECTION WITH THE PIVOT MEMBERS AT ONE END OF THE CARRIER; (D) A SECOND BEARING STRUCTURE SUPPORTING THE CARRIER FOR ROTATION AND AT A LOCATION AXIALLY SPACED FROM SAID FIRST BEARING STRUCTURE, AND A SECOND SET OF WORK GRIPPING JAWS HAVING DRIVEN CONNECTION WITH SAID PIVOT MEMBERS ADJACENT THE OPPOSITE END OF SAID CARRIER; (E) LEVERS EXTENDING IN THE SPACE BETWEEN SAID FIRST AND SECOND BEARING STRUCTURES AND OPERATIVELY CONNECTED WITH THE PIVOT MEMBERS SO AS TO SIMULTANEOUSLY PIVOT THE MEMBERS AND BOTH SETS OF JAWS, THE JAWS OF BOTH SETS BEING LOCATED TO SIMULTANEOUSLY GRIP WORK PROJECTING THROUGH THE HOLLOW CARRIER AS THE PIVOT MEMBERS ARE ROTATED BY SAID LEVERS; (F) A DRIVE MOTOR ROTATABLE CLOCKWISE AND COUNTERCLOCKWISE ABOUT SAID CENTRAL AXIS; (G) AND LINKS OPERATIVELY CONNECTED WITH THE ROTOR AND LEVERS TO TRANSMIT ROTARY DRIVE FROM THE ROTOR TO SAID LEVERS SO AS FIRST TO PIVOT THE PIVOT MEMBERS RELATIVE TO THE CARRIER TO CARRY THE BOTH SETS OF JAWS INTO ROTARY DRIVING ENGAGEMENT WITH WORK PROJECTING AXIALLY FROM WITHIN THE CARRIER HOLLOW, AND THEREAFTER TO ROTATE THE CARRIER ABOUT SAID CENTRAL AXIS.