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Publication numberUS431203 A
Publication typeGrant
Publication dateJul 1, 1890
Filing dateAug 28, 1889
Publication numberUS 431203 A, US 431203A, US-A-431203, US431203 A, US431203A
InventorsGeorge W. Dithridge
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
George w
US 431203 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



No. 431,203. Patented July 1, 1890.



SPECIFICATION forming part of Letters Patent No. 431,203, dated July 1, 1890.

Application filed August 28, 1889. Renewed June 4, 1890- Serial No. 354,192. (No model.)

' l of the city, county and State of New York, have invented an Improvement in Metal Tubes, of

v which the'followin'g is a specification.

Weldless metal tubes have heretofore been made and two or more of such tubes have been grouped together and connected with stays and straps to form various horizontal and vertical supports; but such tubes lack strength in a horizontal directionv Tubes or hollow bodies have'also been formed of two or more plates curved and having flanged edges, the pieces being riveted together at the flanges, thus forming tubes or hollow bodies; but these are no stronger than their weakest point, namely, the rivets.

My invention 'is a new article-of. manufacture; and the same consists of a metal tube having one or more fins or ribs integral therewith and the metal at the junction of the fin with the tube of increased thickness. These tubes and fins are adapted to be grouped together to form horizontal beams or vertical columns or braces, the fins serving as places of attachment for the rivets of the connecting plates or braces.

In the drawingsl have represented, Figures 1 to 8 inclusive, cross-sectional views of tubes having one or more fins or ribs made integral therewith; and in Fig. 9 I have represented by an elevation part of a beam or girder having my improved tubes.

Fig. 1 shows a circular tube (1, having a single fin b made integral therewith, the

dotted lines representing the positions that. might be occupied by other fins.

Fig. 2 is a similar view-,exce t that the fin b is made deeper and has a atfootorflange 4, and in- Stead of this foot 4 the end might be an inverted-V-shaped flange, as shown in dotted lines. Fig. 3 represents a circular tube a, having two fins 1), made integral therewith, there being an open space between the fins,

and in this figure, by dotted lines, I have 7 shown that the fins may be widened and provided with foot-pieces at 5. Fig. 4 shows a circular tube, the fin b of which is formed by I closing in the tube upon itself, and other fins which might be employed are shown by dot-- ted-lines. Fig. 5 shows'a circular tube with the fin 7 tapering from the tubular body, so that the metal at the junction of the fin to the body is much thicker than the tube or other part of the fin. Fig. 6 represents a square tube a, havingtwo fins if, made integral therewith; and Fig. 7 represents a square tube with a single fin, the edge or flange of whichI have shown at 8 as inverted-V-shaped, with agroove on the under side, or the fin might have a straight flange or foot-piece, as shown by dotted lines. Fig. 8 shows a tube which is square upon the exterior surface and round internally and provided with a fin that is integral therewith. Fig. 9 illustrates a beam or car-sill formed from two tubes, the fins of which point toward each other, with diagonal braces riveted to these fins to make up the beam or sill.

The fins being integral with the tubes add greatly to the strength and form convenient places for attaching plates'or braces in making up beams or other supports for any desired character of metal-work construction.

I claim as my inventionl. As a new article of manufacture,a metal tube having one or more fins or ribs integral therewith, and the metal at the junction of the fin with the tube of increased thickness, substantially as set forth.

2. Metal tubes having fins or ribs integral therewith, in combination with connectingplates secured to said fins to form a sill, beam, or other support, substantially as set forth.


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US2741513 *May 5, 1952Apr 10, 1956Dempsey Lloyd ESwing stage platform
US2757965 *Aug 24, 1953Aug 7, 1956Alvadore M AndrewsRoof sprinkler
US3111207 *Jun 6, 1960Nov 19, 1963Ralph E BraddonBar joists
US3294252 *Dec 3, 1963Dec 27, 1966Ishikawajima Harima Heavy IndCrane girders
US3415031 *Oct 12, 1965Dec 10, 1968Avi Alpenlaendische VeredStructural steel element
US3962841 *Jan 30, 1975Jun 15, 1976Decks, IncorporatedInsulated decking structure and method
US3965641 *Apr 4, 1974Jun 29, 1976Decks, IncorporatedSheet metal structural shape and use in insulated decking structure and method
US4785685 *Apr 9, 1987Nov 22, 1988Toyota Jidosha Kabushiki KaishaRack guide of synthetic resin for a rack and pinion type steering device
US4842051 *Dec 21, 1987Jun 27, 1989Brownlee David ARabble arm used in multiple hearth furnace
Cooperative ClassificationE04C2003/043