Stock material or miscellaneous articles – All metal or with adjacent metals – Having variation in thickness
Reexamination Certificate
2006-05-30
2006-05-30
Zimmerman, John J. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Having variation in thickness
C428S582000, C428S586000, C428S599000, C280S495000
Reexamination Certificate
active
07052778
ABSTRACT:
A cold forging process and apparatus for reinforcing an end of a rectangular tube, including a close fitting, rectangular upper mandrel that inserts into the tubing. The upper mandrel has flared corners at the end attached to the upper die. As the upper die is moved under pressure towards the lower die, the flared corners of the mandrel makes contact with the inner surface of the tube. This ensures that the tube begins to deform outward before the rest of the upper die contacts it. As the upper die is pressed towards contact with the lower die, the end of the tube is cold formed into a collar. The dies are then moved apart and the cold-formed tube removed. A lower mandrel positions and retains the die during forming. After forming the lower mandrel is used to eject the formed part, which may for instance be a trailer hitch housing.
REFERENCES:
patent: 1966053 (1934-07-01), Squires
patent: 3833984 (1974-09-01), Dietzel
patent: 4442693 (1984-04-01), Walter et al.
patent: 5203194 (1993-04-01), Marquardt
patent: 6408672 (2002-06-01), Roe et al.
patent: 6796574 (2004-09-01), Palmer
patent: 2005/0005667 (2005-01-01), Greczanik et al.
Synnestvedt Lechner & Woodbridge LLP
Zimmerman John J.
LandOfFree
Method and apparatus for cold forging a trailer hitch... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for cold forging a trailer hitch..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for cold forging a trailer hitch... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3611555