Production of threaded metal rods for making U-bolts
US4748707A · kind A · utility
Inventor
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D11/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.