US294542A - Mandrel for cable-presses - Google Patents

Description

No. 294,542..v 4 Patented Mar... .4, 1884.

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umm .ia-mun UNITED STATES Y' PATENT OFFICE.

RICHARD S. WARIN G, OF *PITTSBURGH PENNSYLVANIA.

MANDREL FOR CABLIEPRESSES.

SPECIFICATIN forming part of Letters Patent No. 294,542, dated March 4, 1884.

Application filed August 9, 1883. (No model.) l

To all whom it may concern:

Be it known that I, RICHARD S. WARING, a citizen of the United States, residing at Pittsburg, county of Allegheny, State of Pennsylvania, haveinvented'or discovered a new and useful Improvement in Mandrels for Cable- Presses; and I do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanyingv drawings, making a part of this specication, in whichlike letters indicating like partsg Figure lis a view in side elevation of my improved mandrel. Fig. 2 is an end view, looking downward upon the nipples or point. Fig. 3 is a longitudinal sectional view, the plane of section being indicated by the line w x, Fig. 2. Figs. 4 and 5 are transverse sectional views taken in the planes of the lines y y and a z, respectively; and Figs. 6 and 7 are perspective and sectional views, respectively, of the cablel made by means of my improved mandrel.

My invention relates to the manufacture of an electric cable such as represented at R, Figs. 6 and' 7 having a group of insulated conducting-wires, r, inclosed each in its appropriate passage formed in the common body, of lead or equivalent soft-metal covering, r, which covering also incloses a series of hard-metal wires, r2, designed to afford tensile strength and prevent injury to the conducting-wires by abrasion or wearing away of the lead covering. The only material difficulty encountered in the manufacture of a cable of this construction by means heretofore employed-namely, a lead-press-is due principally to lack of provision therein for supplyingilead to the inner spaces between wires, and at the same time secure the desired proximity of wires and prevent lateral displacement of them by pressure of lead thereon.

My present invention is especially designed to meet these and similar requirements in manufacture; and, in general terms, it consists -bularAcore-bar B. A chambered recess, A',

(three being shown in the present instance) y ing or otherwise forming them thereon; or, if

in the outer surface of the mandrel for directing dow of lead to different parts of the spaces surrounding the nipples, as hereinafter more fully described and claimed.

In the drawings, A represents a tapering body, of iron, steel, or other suitable metal, having a threaded socket, c, in its base end, adapted to screw onto the threaded end of tuin orlbelow the base of the socket, registers with the tubular passage of the core-bar, and affords a common opening for leading in the several wires to be contained in the cable. From the base of recess A are drilled separate passages a', leading through the body A, and emerging at the point or tapered end in the form of distinct nipples `or tubular extensions e e. rIhe inner or central nipples, e,

are designed for passing therethrough the insulated conducting-wires, and they occupy lpositions in close proximity at equal intervals from the vcommon center. 'Ihe outer or surrounding nipples, e', (six in number, as shown, are made at equal intervals around the inner set of nipples, e, and are designed for passingtherethrough the strengthening-wires of the cable.- These nipples may be made integral with the body portion of the mandrel by turnpreferred, they may be Vmade separate from and be screwed into tapped holes in the end of the body portion, or be otherwise rigidly secured thereto. I prefer to make them on or asv integral parts of the body, because they can be formedin this way of less metal and within less space. In order to make provision for passing a'supply of ,lead into the inner spaces between nipples, grooves c are cut longitudinally Vin `the -tapered sides of the mandrel, which extend downward to the point between the nipples e. In depth these grooves extend within -the circle 'of nipples e', and by preference to or within the circle of inner nipples, e.

- It will be observed that the number of grooves c and of nipples e is double the number of nipples e, and that the nipples e occur at equal intervals on either side of radial lines produced from the nipples e. This provision is made with reference to directing streams of VIOO lead through the grooves e, both upon the extreme outer surface of nipples @and also upon their adjacent sides, through grooves directed to or into the spaces between nipples c. Lead directed in this manner will pass readily into the narrow central spaces between nipples c, and will insure adhesive union with the lead directed upon the outer side of these nipples, and thus passing off from the nipple-points will envelop the insulated wires with continuous unbroken walls of lead covering, which, however, will be thin or light between wires.

Substantially the same uniformity of leadsupply is thus afforded within and around the central portion of the cable as though the nipples c and the strengthening-wires were not present, and in doing this I avoid injurious side pressure of lead upon the outer nipples, e',and also upon the wires passed therethrough. This is an important feature of construction, as it enables me to make the nipples comparatively light, so as to secure eompactness without injurious weakening of them.

It will also be observed that lead, following` the depths of grooves c, will have motion or direction of fiow substantially in the longitudinal direction of the nipples, making but comparatively little lateral spread necessary to unite the lead around the nipples when the same are reached. This is also a material advantage in preventing breakage of nipples by side pressure thereon, and it affords almost complete relief from side pressure, not only upon the strengthening-wires, as above eX- plained, but also upon the insulated conducting-wires. Side pressure, if it existed, would be a fatal obstacle to close grouping of wires, owing to the tendency of such pressure to flex or bend the wires out of their true or desired relationship or positions, and the construction and arrangement of grooves and nipples by which such difficulty is obviated is an important feature of advantage and improvement with reference to close grouping of wires to secure economy in the use of lead and lightness of product.

In illustrating the principles of my invention I have shown provision for three conducting-wires, six strengthening-wires, and a corresponding number of grooves. I do notwish,

however, to limit my invention to these or any specific numbers, as the same may be increased or diminished, as required, with reference to the desired size or capacity of cable; but in making such changes in the number of wires I prefer to retain substantially the same relationships of numbers and positions of nipples and grooves, because better results are secured thereby in covering the wires.

I make no claim herein to the cable shown and described, as the same, in so far as it may contain patentablc invention, will be included in the subject-mattei' of a separate application for patent.

I have also embraced in other applications mandrels having side grooves extending to the point between groups of nipples, and therefore I do not claim herein such features alone considered, my present invention having additional reference to the special arrangement and relationship of the nipples to the grooves, asherein set forth.

I claim herein as my invention- 1. A mandrel foracable-press, having separate passages therethrough for insulated conducting and for strengthening wires, such passages terminating at t-he pointin tubular nipples, the nipples for conducting-wires being grouped at the center, and the nipples for strengthening-wires surrounding such central group, with grooves in the surface of the mandrel extending to the point between the nipples for strengthening-wires, substantially as set forth.

2. The mandrel A, having wire -passages therethrough,terminating at the point in separate nipples, three of such nipples c being near the center and surrounded by double the number of nipples c', arranged in circular order, with grooves c in the surface ofthe mandrel, extending in depth between the outer nipples, e', to the inner group of nipples, e, substantially as and for the purposes set forth.

In testimony whereof I have hereunto set my hand.

RICHARD S. \VARING.

Vitnesses:

It. H. VIHTTLESBY, C. L. Iiinknn.

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