US1310130A - Method oe producing metal tubes - Google Patents

Description

THOMAS E. MURRAY, JR, 015 BROOKLYN, NEW YORK.

METHOD OF PRODUCING METAL TUBES.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed February 6, 1819. Serial No. 275,288.

'1 '0 all whom it may concern:

Be it known that I, THOMAS E. MURRAY, J r., a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Methods of Producing Metal Tubes, of which the following is a specification.

The invention is a method of roducing metal tubes having walls of varying thickness, and consists in the steps hereinafter set forth.

In the accompanying drawings Figure 1 is a perspective view of one of the stepped blanks from which are made the two longitudinal half sections of the desired tube. Fig. 2 is a perspective view of said tube with the half sections separated. Fig. 3 is a perspective view of said tube with the half sections welded and a thread cut on the thicker portion of the tube. Fig. 4 is a perspective view of one of the tapered blanks from which are made the two longitudinal half sections of the tube shown in Fig. 5, said last-named figure showing said sections separated. Fi 6 is a erspective view of a grooved or c anneled lank, and Fig. 7 is a perspective view of a half tube section formed from said blank.

Similar letters of reference indicate like parts.

There are many uses for a metal tube, of which the wall is of varying thickness or of difierent thicknesses. A simple example is found when it is desired to form a screw thread on a tube having a comparatively thin wall, which wall will not permit of the threading without an undesirable weakening of the wall. In such case I form a flat rectangular blank of metal, as shown in Fig. 1, havln a portion of its length A thicker than t e remaining portion Bor, in other words, step ed.

This blan k is to be of suflicient length and width so that when pressed or bent into semi-cylindrical form, as shown at C, Fig. 2, it will constitute a lon itudinal half section of the desired tube. nother blank precisely similar to that shown in Fig. 1 is pressed into semi-c lindrical form, as shown at D, Fig. 2. T e two semi-cylindrical blanks are then placed with their edges in registering contact and are electrically welded at said edges, as shown in Fi 3, to produce the complete tube. The thic er prtion A may then be threaded, as shown at Where it is desired to produce a tube of tapered thickness, I prepare a longitudinally tapered plate, as shown at F in Fig. 4, and from two of such plates form, by pressing, two precisel similar longitudinal half sections G, H, Fig. 5, which being placed with their edges in contact registry are electrically welded, as before.

If it be desired that the whole tube be taperedthat is, of less diameter at one end than at the other,I make the edge I of the blank shorter than the edge J so that the longitudinal edges converge, and weld the longitudinal edges of the half sections, as before. The semi-circular edges I then form the smaller end and the semi-circular edges J the larger end of the tube.

If it be desired to make a tube with a plurality of thicker portions-to form collars, for example,I prepare a blank plate, as shown in Fig. 6, with as many portions of increased thickness as may be required. In Fig. 6 two such portions K, L are shown. The semi-cylindrical half section, Fig. 7, formed from such a plate is united by electrical welding to a similar half section, as already descnbed.

I claim:

1. The method of makin a tube having its circumferential wall 0 varying thickness, which consists in first forming two similar elongated plates of varying thickness, second, bending said plates transversely into semi-cylindrical sha e, third, placin said bent plates with t eir longitudin edges in registering contact, and, fourth, electrically welding said registering edges together.

2. The method of making a tube having a portion of its circumferential wall of greater thickness than elsewhere, which consists in first formin two similar plates, each transversel divided into two sections of difierent thic ess, second, bending said plates transversely into semi -cylindrical shape, third, lacin said bent plates wit-h their longitudinal ges in registering contact, and, fourth, electrically welding said registering edges to ether.

' The method 0 making a tube having portions of its circumferential wall of greater thickness than elsewhere, which consists in first formin two similar lates, each transversely divide into a plurality of sections alternately of greater and less thickness, second, bending said plates transversely into semi-cylindrical shape, third, placing said bent plates with their lon itudinal edges in re 'stering contact, and, ourth, electrically we ding said registering edges together.

4. The method of making a tube having its circumferential wall of taperin thickness from end to end of said tube, which consists in first forming two similar plates of gradually diminishing thickness longitudi-.

nally, second, bending said plates transversely into semi-cylindrical shape, third,

electrically We ding said registering edges is to ether.

n testimony whereof I have affixed my signature in presence of tWO Witnesses.

THOMAS E. MURRAY, J 1:.

Witnesses:

GERTRUDE T. PORTER, MAY T. MOLABRY.

Copies of this patent may'be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. t

Images