Apparatus for cold bending of tubular bodies and the like

Claim 1

A BENDING MACHINE COMPRISING, IN COMBINATION: AN ELONGATED CYLINDER HAVING A FORWARD END AND A REAR END; A PLUNGER RECIPROCABLY RECEIVED IN AND HAVING A ROD EXTENDING TOWARD THE FORWARD END OF SAID CYLINDER; A HOUSING CONNECTED TO THE REAR END OF THE CYLINDER; A SUPPLY OF PRESSURE FLUID IN SAID HOUSING; PUMP MEANS CARRIED BY THE HOUSING AND COMPRISING LEVER MEANS FOR PUMPING THE PRESSURE FLUID INTO, AND FOR THEREBY DISPLACING THE ROD IN AN OUTWARD DIRECTION BEYOND THE FORWARD END OF, SAID CYLINDER; A SUPPORTING STRUCTURE INCLUDING A SUBSTANTIALLY ANNULAR MEMBER SLIDABLY MOUNTED ON SAID CYLINDER FOR MOVEMENT BETWEEN THE ENDS OF SAID CYLINDER; STOP MEANS FOR ARRESTING THE ANNULAR MEMBER AT THE FORWARD END OF SAID CYLINDER; FIRST BENDING MEANS INCLUDING A BENDING MEMBER CONNECTED WITH SAID SUPPORTING STRUCTURE AND RECIPROCABLE BY THE LATTER BETWEEN AN OPERATIVE POSITION WHEN THE ANNULAR MEMBER IS ARRESTED BY SAID STOP MEANS AND A RETRACTED POSITION WHEN THE ANNULAR MEMBER IS ADJACENT TO THE REAR END OF SAID CYLINDER; AND SECOND BENDING MEANS COMPRISING TWO TRANSVERSELY SPACED COUNTERBEARINGS CONNECTED WITH SAID ROD FOR OUTWARD MOVEMENT TOWARD THE BENDING MEMBER WHEN THE LATTER IS IN SAID OPERATIVE POSITION AND THE LEVER MEANS IS OPERATED TO BRING ABOUT OUTWARD DISPLACEMENT OF SAID ROD BEYOND THE FORWARD END OF THE CYLINDER, WHEREBY A WORKPIECE INSERTED BETWEEN SAID BENDING MEMBER AND SAID COUNTERBENDING IS BENT ABOUT THE BEARING MEMBER IN A DIRECTION CONVEXLY AWAY FROM THE FORWARD END OF SAID CYLINDER.