Patent
1986-06-20
1987-04-07
Combs, E. Michael
72 31, 72213, B21K 174, B21D 908
Patent
active
046549129
ABSTRACT:
Elongated straight cylindrical metal rods are threaded along opposite end portions, and the cylindrical outer surface of the center portion of each rod is marked to form a visual indicator of the longitudinal center of the rod. The straight rods are successively inserted into a rod bending machine having a mandrel with a mark indicating the center plane of the bending operation. The mid-point mark on each rod is aligned with the center plane mark on the machine, and the rod is bent to form a precision U-bolt. Preferably, the mark identifying the center of each rod extends circumferentially around the metal rod and is formed by a stripe of color contrasting ink to provide a permanent mark which does not require rotating the rod to find the mark.
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