USRE5190E - sheets - Google Patents

Description

2Shegts--Sheetl. S. P. M. TASKER.

Manufacture 'uf welded Tubing. NO. 5,190. Reissued Dec.17,1872t 2 SHEETSSHEET 1.

INVEN'TOR W TNESSES 2 Sheets Sheet 2.

S. P. M. TASKER. Manufacture of Welded Tubing. No. 5,190.

Reissued Dec. 17, 1872.

2 SHEETS SHEET 2.

WITNE SSE s INVENT on. My

the furnace and brought to a and are then passed through a pair of grooved UNITED STATES PATENT Orrron.

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

IMPRUVEMENT EN THEMANUFASTURE OF WELDED TUBINC.

Specification forming part of Letters Patent No. 91,791, dated June 22,1869; reissue No. 5,190, dated December 17, 1872.

To all whomit may concern.-

Be it known that I, STEPHEN P. M. Tus- KER, of the city of Philadelphia, and. State of Pennsylvania, have invented certain -Improve ments in Welding and Sizing- Wrought-Metal Tubing, of which the following is a specification:

The usual method of welding and sizing meta-l tubes is as follows: The tubes having been previously bent with their beveled edges overlapping each' other for making what is called lap-welded joints, or with their square edgesbutting against each other for making joints, after being laid aside to butt-welded cool and cast ofi their scales, are returned to welding heat,

rolls to weld the joints and reduce the tubes to their requisite size. The outer corners of the grooves at the peripheries of the rolls have necessarily to be rounded off to prevent their cutting into the outer surfaces of the tubes or leaving marks thereon. Consequently the metal in the rolling process is pressed around these. corners, producing thick places at two opposite points and from end to end of the tubes, which sometimes project between the edges of the rolls, forming fins. To overcome these defects, after the tubes have been al- [owed to cool andcast their scales, they are again reheated and passed through the fro1ls,bto roll down the fins andthick places,

and ring the tubes toa uniform thickness. To accomplish this the tubes are placed as they are entered between the rolls in a position at right angles to the one they assumed at the previous rolling, so as to bring theirfins and thick places at the bottom or middle and concentric parts of the grooves of the rolls. This requires great care to prevent any imperfection in the tubes, which would require them to be again reheated and advance of the first pair, and running in a passed. through the rolls. To avoid more than-one heating andplane at right angles thereto, or nearly so, so as to roll down the fins and thickened parts which are formed at opposite sides of the tubes by the action of the first pair of rolls, and thus to make a complete welding and sizing of the tubes at one operation, with the reheating andrerolling of the tubes, which are necessary in the usual mode, as above stated.

It will thus be seen that a large amount of time is saved by my improved method; and a better quality of tubes is secured by not subjecting them to so many heats,.as every time they are reheated more or less scales are formed, reducing the thickness and injuring the quality of the metal. 1

Figure l is a plan view of my improved machine. Fig. 2 is a rear elevation of the same. Fig. 3, Sheet No. 2, is a side elevation. Fig. 4 represents a section of a skclp for a lap-welded tube on all enlarged scale. Fig. .5 is a section of thesame when bent into the proper form for the welding operation. Fig. 6 represents a section of a tube in the form it assumes in passing through. the first pair of rolls B B. Fig. 7 represents a section of a tube in the finished form given it by the second pair of rolls B B. I

Like letters in all the figures indicate the same parts.

A represents the permanentframe with which I the several parts of the improved machine are connected. B B, on the horizontal shafts O G at the front of the machine, are grooved rolls, through which the bent tubes are passed .for weldin aud'B B in advance of the same are like rolls on the vertical shafts O O. Concentric with the grooves a in the peripherics ofthe rolls is the ordinary mandrel l), which is held in position in theusual manner.

The shafts O G and G C of the rolls B B B B and the intermediate shafts E E are connected together by spur-gear wheels 15 and miter-w]: eels E. Either of the shafts in the series may be connected with the motive po wer. .I do 'not confine. myself to the use of the gearing represented in the drawing, but purpose using any suitable means for communicating motion to the rolls, and thereibre deem a further description thereof unnecessary.

The operation is as follows: The bent tubes whereby I dispense as they pass through the rolls B B are welded and brought to their proper size and form except at two opposite points, which pass the rounded corners of the grooves a. The metal at these points being pressed out is thickened, and sometimes fins are prodaced, as seen in the cross-section, Fig. 6. As the tubes pass through the second pair of rolls B B, the bottom or middle parts of the grooves being at right angles to that of thefirst pair of rolls, and these parts, being brought into contact with the fins or fenlarged parts of theskelp, press them doWn-andbring the tubes to a perfect concentric form, with a uniform thickness of metal throughout their whole circumference. Thus the tubes are welded and brought into proper size and form at one operation, whereby the cost of manufacturing them is greatly reduced and their quality .improv'ed' by dispensing with the extra reheating and rerolling incidental to the ordinary mode of weldin g andsizing. I

Itwill be seen that. instead of placing the second pair of rolls at right angles with that of the first pair, all that is requisite is to have them so arranged as to run in diflerent planes frointhe first, so that the concentric parts of the grooves shall bite on the thick places and fins of-the tubes that are produced by the action of the first pair. But, nevertheless, Iprefer placing them at right angles, as represented in'the drawing.

I claim as my invention- The method herein described of manufacturin g welded tubing-that is to say, first bending the skelp to the form of a tube by any suitable machinery, then welding the joint and rolling down inequalities While at a welding heat by means of two pairs of rolls, constructed, arranged, and operating as set forth.

- STEPHEN P. M. TASKE'R.

Witnesses:

THOMAS J. BEWLEY, STEPHEN UsTIoK.

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