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Publication numberUS1123616 A
Publication typeGrant
Publication dateJan 5, 1915
Filing dateMar 24, 1914
Priority dateMar 24, 1914
Publication numberUS 1123616 A, US 1123616A, US-A-1123616, US1123616 A, US1123616A
InventorsAndrew M Stewart
Original AssigneeNat Supply Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of forming ribbed metal pipes.
US 1123616 A
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Description  (OCR text may contain errors)


L1$3fi1 6., Patented Jan.5,1915.

ATTORNEYS body of the pipe,

lindrical form t substantial, ow'of metal to ash ape rei'axis to substantially cylindrical pipe into a pipe with'a shape or cross-section resembling an 'elli'pseor oval, and simultaneously or afteriward press together the longitudinal portions of the more or less elliptical or oval pipe at form longitudinal ribs on the pipe. "Preferably at the same time I change the that is the pipe irrespective of the ribs, back to a substantially cyby making the longer and shorter axes ofthe said shape e uali However, this step may be omitted it a cylindrh cal ribbed pipe is not desired asa finished article.

I claim 7-1. The method of changing a substantially cylindrical pipe of substantially uniform wall-thickness into a longitudinally ribbed pipe having substantially the same Wall thickness, which "consists in changing the crosssectionofthe pi eby bending action Withopposite sides of the major or longer senibling an ellipse, and pressing together the proximate portions thereof at opposite l sides of the ends of the major axis of the said shape to form longitudinal ribs.

2. The method of changing a substantially cylindrical pipe of substantially uniform Wall-thickness into a longitudinally ribbed 1 Ohio, this 18th day of A. M. STEWART. Witnesses:

G. W. Sunni-1n, C. H. AUFDERHEIDE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2906299 *Mar 5, 1954Sep 29, 1959Gen Electric CanadaManufacturing grids
US5312198 *Dec 29, 1992May 17, 1994Ran Enterprises, Inc.Jack extension tube
US5536100 *Jan 31, 1994Jul 16, 1996Ran Enterprises, Inc.For a vehicle
US5577796 *Jun 7, 1995Nov 26, 1996Norsk Hydro A.S.Structural beam and method of manufacture thereof
U.S. Classification72/252.5, 72/370.16, 72/370.23
Cooperative ClassificationB21B13/142