US1019805A - Tube-drawing machine. - Google Patents

Description

R. KOENIG.

TUBE DRAWING MACHINE.

APPLICATION FILED MAY 18, 1911.

Patented Mar. 12, 1912.

SHEET 1.

ZMSr/ fin; Suva n for- 2 SHEETS I v x M 351 Zttozwug M J. U

R. KOENIG.

TUBE DRAWING MACHINE.

APPLICATION FILED MAY 18, 1911.

1,019,805, Patented Mar. 12, 1912.

2 SHEETS-SHEET 2.

Witmmeo UNITED STATES PATENT OFFICE.

ROBERT KOENIG, OF BROOKLYN, NEW YORK. ASSIGNOR' I0 PHENIX TUBE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW JERSEY.

TUBE-DRAWING MACHINE.

Specification of Letters Patent.

Patented Mar. 12, 1912.

Application filed May 18, 1911. Serial No. 627,950.

'l'o all whom it may concern:

of. New York, have invented new and useful Improvements in Tube-Drawing Machines, of which the following is a specification.

My invention relates to the manufacture of sheathed tubes, which are composed of an inner seamed tube of steel or iron, and an outer seamed covering of metal such as brass, the inner tube contributing strength and the covering or sheathing giving the.

desired finish. Such tubes are made by forming bands of metal into split or seamed tubular shape, and are usually brazed at the seam. The heretofore used method of mak ing such sheathed tubes is that described in Skogses United States Patent No. 617,363, dated January 10, 1899, and large quantities of sheathed tubing have been produced by this method, though it presents sundry de fects which it is the object of my present invention to remedy. Chief among these defects, incidental to the Skogse method, are de artfire from true cylindrical form inthe finished tube, and waste, due to damage of the thin relatively delicate brass sheathing by roughness and irregularities of the inner steel core-tube. The rolling and shaping of the inner steel tube, by the Skogse method involves the application of rolling pressure from the unyielding rolls through the thin brass strip, and the inevitable occasional roughnesses and irregularities in the steel core bruise and tear the thin brass.

My invention consists in a drawing machine for sheathing tubes, and is exemplified by the machine illustrated in accompanying drawings, in which- Figure 1 is a top plan view of the sheath forming and tube drawing devices, Fig. 2 is a view, partly in side elevation and part section of the said devices, Fig. 3 is an end elevation (viewed from the left in Fig. 1) of portions of the machine, Fig. 4 is a cross section of portions of the machine, taken at the line 4:4 of Fig. 1, viewed in the direction shown by the arrow, Fig. 5- is a cross section taken at line 5--5, Fig. 1, showing part of the edge turning die and the two tube members, Fig. 6 is a cross sec tion taken at the line 6-6, Fig. 1, and Fig. 7 is aplan view, showing the gradual development of the materials into a completed sheathed tube, ready for brazing.

The core tube T isfirst prepared by rolling from a strip in a machine such as is shown in the said Skogse patent, or by other means if practicable or desired, so that when it is introduced into the sheathing machine it has had all roughnesses and protuberances rolled smooth .by the hardened surfaces of the rolls in the forming machine, and is thus in condition to receive a thin sheath of brass or other suitable sheathing metal.

The drawing machine is provided with a suitable drawing head or dog (not shown) such as is usual in drawin benches, and with a standard D, on which t e bridge 0 is mounted. The bending funnel E is secured in the standard D, and the tube guide F, provided with thedepending web F is secured to the bridge C. Die plates M and M are secured to the draw-bench, the die plate M having a slightly conoidal constricting die at m, and the plate M a finishing die at m. The edge-turning die L is mounted in the constricting die opening, and presents to the tube-members a central fin L and inclined edge-turning surfaces L'-.

The tube-core T, with its longitudinal open seam T is introduced through the bending funnel E, the seam T embracing the tube ide F, which guides the tube T so thatt e fin L f the edge turnin die will also enter the seam T. A strip of brass or other suitable metal, drawn ,from the reel R, is introduced into the funnel E, and thereby bent upwardly around the tube core T. The narrowed end of the bending funnel E, shown in Fig. 4, delivers the sheath-strip B to the edge-turning surfaces L? of the edge-turning die L; the die L turns the edge of the sheath-strip inward and downward into the open seam T of the tube core T, as shown in Fig. 5. As the tube core T and inturned sheath strip B passfolds of the sheath strip into close engage ment with the fin L and thus, by reason of the flow of metal, turning the edges of the sheath strip under the edges of the seam T,

as illustrated in Fig. 6. Thence the sheathed tube passes to the finishingndie m, where the seam is drawn close, and a1 true cylindrical form given to the sheathed tube, which is then ready to be brazed. Bythus using a tube core which has been rolled smooth and then folding, edge turning and drawing a tube-sheath over it, engaging the sheath with the core at their common seam,

and finally drawing the sheathed tube in a.

finishing mandrel, a truly cylindrical finished product results, and waste due to inguide to extend through the seam of a tube to be sheathed, aneclge-turning die to infold the edges of a tube sheath into the seam of a tube, a u'ide fin alined with the tube guide and gni way of the edge turning die surfaces, and aconstricting die.

2. In a drawing machine for sheathing seamed tubes, the combination of a'bending' funnel, a tube guide to extend through the seam of a tube to be sheathed, an edgeturning die to infold the edges of a tube sheath into the seam of a tube, a guide fin alined with the tube guide and midway of the edge turning die surfaces, and a constricting die.

Signed by me at Brooklyn, New York, this th day of May 1911. t

ROBERT KOENIG.

\Vitnesses:

EUGENE V. GALLAGHER, J AMES W. HICKEY.

Images