Metal deforming – By three or more coacting relatively movable tools – Concurrently actuated tools
Reexamination Certificate
2001-03-06
2002-10-01
Crane, Daniel C. (Department: 3725)
Metal deforming
By three or more coacting relatively movable tools
Concurrently actuated tools
C072S402000, C072S370010, C072S370210
Reexamination Certificate
active
06457343
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
Not Applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable.
REFERENCE TO “MICROFICHE APPENDIX”
Not Applicable.
BACKGROUND OF THE INVENTION
This Invention relates to a device and method for swaging metal tubing. Swaging is desired in construction, for example, of the framework of buildings to join two pieces of tubing. The desired way is to reduce the outside diameter by swaging the outside diameter of one end so that it is slightly smaller than the inside diameter of the unswaged tubing. This swaging allows the end of one member to be inserted into the unswaged end of another member, wherein the resulting joint can be held in place by a large number of means, including screws, bolts, or welding, if desired.
SUMMARY OF THE INVENTION
The present Invention involves a method and device for swaging tubing through the use of a set of movable dies arranged around a central mandrel. The central mandrel is inserted in the tubing to be swaged and provides a minimum final diameter for the tubing. The mandrel also has indentations which correspond to ridges on the movable dies to assist in reducing the size of the tubing to be swaged. As the dies are compressed against the tubing, the tubing is thereby collapsed around the mandrel and takes on the shape of the mandrel.
REFERENCES:
patent: 2182663 (1939-12-01), Eby et al.
patent: 3538816 (1970-11-01), Blum
patent: 3759203 (1973-09-01), Frankenberg
patent: 4154082 (1979-05-01), Beech
patent: 4924586 (1990-05-01), King et al.
patent: 5160108 (1992-11-01), Orain
patent: 5634367 (1997-06-01), Yamada et al.
patent: 5950482 (1999-09-01), Nagasawa et al.
patent: 1963 979 (1971-06-01), None
patent: 2-127928 (1990-05-01), None
Clements Aaron R.
Crane Daniel C.
Hurley, Reyes & Guinn
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