Spring hinge and method of assembling same

Claim 1

A METHOD OF ASSEMBLING A SPRING HINGE, COMPRISING THE STEPS OF JOINING THE LEAVES OF SAID HINGE BY INSERTING AN ELONGATED PINTLE THERETHROUGH BUT LEAVING A PORTION OF SAID PINTLE EXPOSED ON BOTH ENDS OF THE ASSEMBLED LEAVES, BLANKING OUT A PORTION OF THE ASSEMBLED HINGE LEAVES AND PINTLE EXTENDING THEREIN TO DIVIDE SAID PINTLE AND TO FORM AN OPENING, AND SIMULTANEOUSLY CUTTING A PORTION OF THE EXPOSED ENDS OF THE SERVED SECTIONS OF SAID PINTLE BUT LEAVING A PORTION THEREOF EXPOSED THAT CORRESPONDS TO ONE-HALF THE LONGITUDINAL DIMENSION OF SAID OPENING, POSITIONING A COIL SPRING IN SAID OPENING, AND MOVING THE DIVIDED PINTLE SECTIONS INWARDLY WITHIN SAID COIL SPRING UNTIL THE EXPOSED ENDS THEREOF ARE COEXTENSIVE WITHIN THE ADJACENT EDGES OF THE JOINED HINGE LEAVES, WHEREBY THE INNER ENDS OF SAID PINTLE SECTIONS ABUT TO LOCK SAID COIL SPRING IN ASSEMBLED RELATION WITH SAID HINGE LEAVES.