US498458A - James callan - Google Patents

Description

VJ. CALLAN, METAL TUBING (No Model.)

No. 498,458. y Patented May 30, 1893 UNITED STATES PATENT OFFICE.

JAMES CALLAN, OF WATERBURY, CONNECTICUT, ASSIGNOR TO RANDOLPH da CLOWES, OF SAME PLACE.

METAL TUBING.

SPECIFICATION forming part of Letters Patent No. 498,458, dated May 30, 1893. Application filed February 9, 1893. Serial No.461,582. (No model.)

To @ZZ whom it may con/cern:

Be it known that I, JAMES CALLAN, of Vaterbury, in the County of New Haven and State of Connecticut, have invented a new and useful Improvement in Metal Tubing, of which the following is a specification.

This invention consists in a metal tube having integral with it or forming parts of it externally projecting ribs which run sinuously in the direction of its length, such tubes being not only ornamental vbut having greater stiffness for certain uses than plain tubes of the same Caliber and weight.

Figure l represents an external longitudinal view of a piece of tubing constructed aecording to my invention. Fig. 2 represents a transverse section of the same.

In the example represented the tube A has three sinuous ribs a a a running lengthwise 2o of it, but the number is immaterial so far as my invention is considered. The ribs are represented as hollow and their interiors form portions of the interior of the tube. Snell tubing may be of any metal but generally I prefer to make it of duotile metal and to produce its `sinuous ribs by drawing it through a suitable die to which during the drawing of the tube directly through it, an oscillating movement about its axis is given by any suitable means.

What I claim as my invention, and desire to secure by Letters Patent, is

A metal tube having integral with `it eX- ternal ribs running sinuously in the direction of its length, substantially as herein described.

JAMES CALLAN. Witnesses:

FREDK. HAYNEs, CHAS. A, COTTER.

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