Tube expanding device

Metal deforming – By use of tool acting during relative rotation between tool... – Tool orbiting or rotating about an axis

Reexamination Certificate

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Details

C072S126000

Reexamination Certificate

active

07490499

ABSTRACT:
A tube expanding device includes: a plurality of rollers each having a tapered portion whose diameter increases toward its front side; a cylindrical expander frame for freely rotatably holding the plurality of rollers on a concentric circle; a mandrel inserted in the expander frame so as to be freely slidable and rotatable relative to the expander frame, and having a tapered portion whose diameter decreases toward its front side, the tapered portion of the mandrel matching the tapered portion of each roller; a drive device coupled to the expander frame and rotating the expander frame; and a moving device for moving the mandrel forward and backward relative to the expander frame. By moving the mandrel forward relative to the expander frame, the tapered portion of the mandrel abuts on the tapered portions of the plurality of rollers and thereby expands a diameter of a circumscribed circle formed by the plurality of rollers.

REFERENCES:
patent: 3854314 (1974-12-01), Martin
patent: 3906771 (1975-09-01), Martin
patent: 4319472 (1982-03-01), Martin
patent: 4615198 (1986-10-01), Hawkins et al.
patent: 4658616 (1987-04-01), Bastone
patent: 4716752 (1988-01-01), Diller
patent: 1-143632 (1989-10-01), None
patent: 7-15128 (1995-03-01), None
patent: 7-290171 (1995-11-01), None

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