Apparatus for anchoring the seams of lock seam tubing

Claim 1

A MECHANISM FOR ANCHORING WITH RESPECT TO EACH OTHER SUCCESSIVE LAYERS OF THE SEAM OF A LOCK SEAM HOLLOW TUBE WHICH COMPRISES A PAIR OF ROLLERS MOUNTED ON PARALLEL AXES AND PROVIDED WITH ANNULAR SURFACES DEFINING THEREBETWEEN IN THE PLANE OF SAID AXES SUBSTANTIALLY A CIRCLE CORRESPONDING IN DIAMETER TO THE TUBE WHEREBY SUCH TUBE IS MOVABLE BETWEEN SAID ROLLERS WHILE BEING SUPPORTED SOLELY THEREBY AGAINST RADIALLY OUTWARD DISTORTION, ONE OF SUCH ROLLERS BEING FORMED AS COAXIAL SECTIONS HAVING ADJACENT ENDS SPACED FROM EACH OTHER A DISTANCE APPROXIMATELY EQUAL TO THE WIDTH OF THE SEAM, AN ANNULAR SPACER ARRANGED BETWEEN SUCH SECTIONS COAXIALLY THEREWITH AND OF SMALLER DIAMETER THAN SAID ADJACENT ENDS OF SAID SECTIONS TO ACCOMMODATE THE TUBE SEAM AS TO ITS DEPTH WHEREBY AS SAID ONE ROLLER IS ROTATED, THE TUBE IS MOVABLE AXIALLY THROUGH THE SPACE BETWEEN SAID ROLLERS, AND MEANS CARRIED BY SAID SPACER FOR DEFORMING SPACED DEPRESSIONS IN THE OUTER AND SUCCESSIVE LAYERS OF THE SEAM OF THE TUBE TO PREVENT RELATIVE SLIDING MOVEMENT BETWEEN SUCH LAYERS.