Metal deforming – Process – Tube making or reshaping
Reexamination Certificate
2005-08-23
2005-08-23
Larson, Lowell A. (Department: 3725)
Metal deforming
Process
Tube making or reshaping
C072S352000, C072S370110, C280S504000
Reexamination Certificate
active
06931906
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 tube 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.
Larson Lowell A.
Synnestvedt Lechner & Woodbridge LLP
Woodbridge, Esq Richard C.
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