Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Reexamination Certificate
2002-02-13
2004-01-13
Larson, Lowell A. (Department: 3725)
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
C072S051000
Reexamination Certificate
active
06675627
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
Applicant hereby claims foreign priority benefits under 35 U.S.C. § 119 of PCT Application No. CH00/00202, filed Apr. 6, 2000, the disclosure of which is herein incorporated by reference.
BACKGROUND OF THE INVENTION
The invention relates to a method and apparatus for forming metal sheets into taper tube shells.
Taper tubes are desired for a multitude of applications. However, taper tube shells that can subsequently be welded to make a taper tube are expensive to fabricate.
Therefore the fundamental problem of the invention is to offer a simple way of rounding sheets conically.
SUMMARY OF THE INVENTION
This problem is solved in the case of a method of the kind stated at the outset, by employing a conical die and punch to deform an individual sheet. Initially the sheet is laid on the length of the die at the start of pressing, and the punch executes a curvilinear motion on plunging into the die.
Also the problem is solved in the case of an apparatus of the kind stated at the outset, by a matching conical punch and die set with actuating means by which the punch is insertable along a curved path into the die.
REFERENCES:
patent: 61678 (1867-01-01), Miller
patent: 179501 (1876-07-01), Aya
patent: 800508 (1905-09-01), Stambaugh
patent: 2701001 (1955-02-01), James
Elpatronic AG
Larson Lowell A.
McCormick Paulding & Huber LLP
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