Power pipe tongs

Claim 1

A POWER TONG FOR ROTATING A PIPE COMPRISING: A FRAME HAVING A CENTRAL PIPE OPENING AND A THROAT LEADING TO SAID CENTRAL PIPE OPENING, A PAIR OF RELATIVELY ROTATABLE RINGS COMPRISING AN OUTER RING AND AN INNER RING DISPOSED IN SAID OPENING, EACH OF SAID ROTATABLE RINGS HAVING SIDE PIPE OPENINGS SO THAT A PIPE MAY ENTER SAID SIDE PIPE OPENING AND SAID THROAT TO SAID CENTRAL PIPE OPENING, POWER TRANSMISSION MEANS FOR ROTATABLY DRIVING SAID OUTER RING IN EITHER DIRECTION, PIPE GRIPPING MEANS ON SAID INNER RING INCLUDING A PLURALITY OF RADIALLY MOVABLE, ANGULARLY SPACED DIE MEANS, JAW MEANS PIVOTALLY SUPPORTING EACH OF SAID RADIALLY MOVABLE DIE MEANS FOR SWINGING MOVEMENTS TOWARD AND AWAY FROM SAID CENTRAL PIPE OPENING, AND COOPERATIVE CAMMING MEANS ON SAID JAW MEANS AND ON SAID OUTER RING FOR CAMMING SAID JAW MEANS TOWARD CENTRAL PIPE OPENING UPON ROTATION OF SAID OUTER RING EITHER DIRECTION FROM AN INTERMIDATE POSITION WITH RESPECT TO SAID INNER RING, MEANS FOR MOVING SAID JAW MEANS AWAY FROM SAID CENTRAL PIPE OPENING WHEN SAID OUTER RING IS MOVED TOWARDS SAID INTERMEDIATE POSITION WITH RESPECT TO SAID INNER RING, AND INNER RING POSITIONING MEANS MOUONTED ON SAID OUTER RING AND ENGAGEABLE WITH SAID INNER RING FOR LIMITING RELATIVE ROTATIVE MOVEMENT OF SAID RINGS WHEN SAID OUTER RING IS ROTATED TO SAID INTERMEDIATE POSITION WITH RESPECT TO SAID INNER RING TO POSITION SAID RINGS SO THAT SAID SIDE OPENINGS ARE ALIGNED TO ALLOW A PIPE TO BE MOVED LATERALLY THROUGH SAID OPENINGS.