Tube bender

Claim 1

A TUBE BENDER COMPRISING A MANDREL OF GENERALLY CIRCULAR CONFIGURATION HAVING A PERIPHERAL TUBE RECEIVING GROOVE EXTENDING FROM A BEND STARTING POINT AROUND SAID MANDREL AT LEAST 90* AND A HANDLE CONNECTED TO THE BASE THEREOF, MEANS FOR HOLDING A TUBE IN SAID MANDREL, A BENDING SHOE FOR ASSOCIATION WITH SAID MANDREL TO BEND A TUBE THEREIN, AND A LINK FOR CONNECTING SAID BENDING SHOE TO THE MANDREL, SAID LINK BEING PIVOTALLY CONNECTED AT ONE END TO THE MANDREL COINCIDENT WITH THE AXIS OF SAID TUBE RECEIVING GROOVE, STOP MEANS ON SAID MANDREL FOR LIMITING THE ROTATION OF SAID LINK AROUND SAID PIVOT AND ARRANGED TO STOP SAID LINK IN A PREDETERMINED POSITION AT SAID BEND STARTING POINT FOR THE START OF A TUBE BENDING OPERATION, SAID SHOE BEING PIVOTALLY CONNECTED TO THE OTHER END OF SAID LINK, SAID SHOE HAVING A TUBE ENGAGING SEAT THEREIN AND LINK ENGAGING MEANS ON SAID SHOE FOR ENGAGEMENT WITH SAID LINK UPON A PREDETERMINED PIVOTING OF THE SHOE ON THE LINK AND TO HOLD SAID LINK AND SHOE IN FIXED RELATION TO EACH OTHER WHEN THE SHOE AND LINK ARE ROTATED AROUND THE MANDREL, SAID LINK BEING PROVIDED WITH A PORTION ARRANGED TO EXTEND ALONG A TUBE TO BE BENT WHEN IN POSITION IN THE MANDREL AND HANDLE AND HAVING TUBE LOCATING MARKINGS ARRANGED FOR JUXTAPOSITION TO A POINT ON THE TUBE FOR DETERMINING THE POSITION OF THE TUBE IN THE MANDREL FOR A BEND OF A PREDETERMINED CHARACTER.