Portable tube bender

Claim 1

IN A TUBE BENDING APPARATUS THE COMBINATION OF A SEMI-CIRCULAR SHAPED BASE FRAME HAVING A SEMI-CIRCULARLY SHAPED RECESS AROUND THE OUTER CIRCUMFERENCE THEREOF, A PAIR OF PARALLEL SPACED GEAR RACKS FIXEDLY POSITIONED AROUND THE INNER CIRCUMFERENCE OF THE FRAME, A PAIR OF LINK ARMS MOUNTED FOR SLIGHT PIVOTAL MOVEMENT ON BOTH SIDES OF SAID FRAME AT ONE END THEREOF AND DIRECTED IN PARALLEL SPACED RELATION INWARDLY ALONG A RADIUS TO THE IMAGINARY CENTER OF THE FRAME, A PAIR OF LINK EXTINSION ARMS EACH PIVOTALLY MOUNTED TO THE END OF A RESPECTIVE LINK ARM, SAID LINK EXTENSION ARMS HAVING A LENGTH GREATER THAN A RADIUS OF SAID BASE FRAME, A ROLLER ROTATABLY MOUNTED AT EACH END TO THE ENDS OF THE LINK EXTENSION ARMS SO THE ROLLER WILL RIDE AROUND THE OUTER CIRCUMFERENCE OF THE FRAME, SAID ROLLER HAVING A SEMI-CIRCULARLY SHAPED RECESS THEREAROUND WHICH MATES WITH THE RECESS AROUND THE OUTER CIRCUMFERENCE OF THE FRAME TO DEFINE A SUBSTANTIALLY CIRCULAR SHAPE, A PAIR OF GEARS MOUNTED IN SPACED RELATION ON A SHAFT ROTATABLY JOURNALLED BETWEEN THE LINK EXTENSION ARMS SO THAT EACH GEAR ENGAGES WITH A GEAR RACK AROUND THE INNER CIRCUMFERENCE OF THE FRAME, SO THAT THE FORCES ON THE ROLLER IN THE BENDING OF THE TUBE ARE TRANSMITTED RADIALLY INWARDLY THROUGH THE LINK EXTENSION ARMS TO THE GEARS RIDING ON THE GEAR RACKS TO MOVE THE GEARS TIGHTER AGAINST THE RACKS AND ARE THEREIN ABSORBED, AND HANDLE MEANS OPERATIVELY CONNECTED IN A RATCHET ARRANGEMENT TO THE GEAR CARRYING SHAFT BETWEEN THE GEARS TO PROVIDE ROTATION OF THE GEARS WHEREBY THE ROLLER IS MOVED AROUND THE OUTSIDE CIRCUMFERENCE OF THE FRAME.