Production of threaded metal rods for making U-bolts

Details Production of threaded metal rods for making U-bolts Production of threaded metal rods for making U-bolts

1987-03-30

1988-06-07

Combs, E. Michael

72 31, 72213, B21K 174, B21D 908

Patent

active

047487070

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.

REFERENCES:
patent: 238848 (1881-03-01), Bulley et al.
patent: 2289516 (1942-07-01), McCullough et al.
patent: 3821887 (1974-07-01), Bennett
patent: 4654912 (1987-04-01), Gray

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