US262027A - Machine for making electric cables - Google Patents

Description

3 Sheets-Sheet 1.

(No Model.)

' J. FARRELL.

MACHINE FOR MAKING ELECTRIC GABLES.

Patented Aug. 1, 1882.

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Hill 12 Y 3 Sheets-Sheet 2,

(No Model.)

J. FARRELL. MACHINE FOR MAKING ELECTRIC GABLE$.

No. 262,027. Patented Aug. 1, 1882.

10/277 Ear/M! 2 1 M ems/q (No Model.) V 3 Sheets-Sheet a, J. FARRELL MACHINE FOR MAKING ELECTRIC GABLES. N0. 262 027 Patented Aug.1, 1882. i|I|l L I Hhllll. Hum

U ITED STATES PATENT Orricn.

JOHNQFARRELL, or PITTSBURG', PENNSYLVANIA.

MACHINE FOR MAKING ELECTR IC CABLES.

SPECIFICATION forming part of Letters Patent No. 262,027, dated August 1, 1882.

Application filed December 2-2, 1881. (No model.)

Pittsburg, county ofAllegheny, State of Pennsylvania, have invented or discovered a new and useful Improvement in Machinesfor Making Electric Cables; and I do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which-like letters indicating like parts- Figure 1, Sheet 1, is a view in sectional elevation ofmy improved machine. 2, is a vertical sectional view, to an enlarged scale, of the die, mandrel, mandrel-head, and

surrounding devices, the section being in the same plane as Fig. 1. Fig. 3 is a sectional view of the parts shown in Fig. 2, the plane of sectionbeing at right angles to that of Figs. 1 and 2. Fig. 4 is a perspective view of the mandrel or wire guard. Fig. 5 isaperspective view of a piece of conductor formed by my improved machine. Fig. 6 isa perspective view, to a reduced scale, ofthe mandrel head or support and Fig. 7, Sheet 3, illustrates,by a view in sectional elevation, certain modifications in the construction of certain parts of the machine.

My invention relates to certain improvements in machines for covering electric-circuit wires with a body of lead, and more particularly to that class of machines embodying the well-known principlesot' construction and op- Fig. 2, Sheet machines usually consist of a hydraulic cylinder and piston for imparting power and motion, a cylinder for containing the lead, a die and core for forming thepipelike article, and a ram or plunger for forcing the lead out of its cylinder through the die, and when employed for covering wires with lead a hollow core has been used for spacing the wires, (two or more,) while the lead coveringis formed on them.

My invention consists in the construction and combination of the mandrel, with its supporting-head and with the die and cylinder, as hereinafter morefully described and claimed. In covering circuit-wires with lead it is highly important that the die and mandrel should remain in fixed, immovable relationship'as regards each other in order to secure a good and uniform product.

In machines of this class, as heretofore constructcd, serious difficulty has been experienced in maintaining the mandrel and die in proper relationship for doing such work successfully, owing to the yielding or stretching of the frame-work and other supports for these parts under the immense pressure employed.

The purpose of my invention is to obviate these difficulties, and this I do by a machine constructed as follows: v

To a hydraulic cylinder, A, is securedacrosshead, 13, by columns or bolts 0, these parts constituting a frame-workby which the remaining parts of the machine are supported. The cylinder A is provided with a piston, D, and piston stem 1), of size and strength adapted to the class of work referred to. The upper end of this cylinder is closed bya head,

A, through which the piston-stem passes, and

this head, as well as the two faces of the piston, are packed with cups (1, to prevent leakage. Ports a a are provided at or near the opposite ends of the cylinder for water supply and exhaust from any suitable hydraulic press. These ports may be controlled by valies substantially as in steam-enginesor in other suitable way whereby the piston may be operated both ways by water-pressure. I do not deem it necessary to show such valves and power apparatus, as such devices are well known for kindred purposes. And instead of hydraulic, steam or other power may be employed for actuating the piston in accordance with wellknown principles.

On the upper end of piston-stem D is fixed a platen, D which carries a hollow bed-block, E, and lead-cylinder H. These parts E and H are secured to the platen by bolts F, in any desired number.

In Figs.1,2, and 3 the block E is shown larger than the lead-chamber H, and forms the immediate under support for the lead-cylinder the two being rigidly connected by the bolts to the platen. This feature of construction may be varied or modified, however, as presently described, without departing from my invention.

In the upper end of tubular passage E of block E, is seated a die, 0, having a. central head or support, I, carrying a hollow stem, i.'

The upper face of this head closes the end of chamber H, and forms, substantially, a bottom for such chamber. Openings 1" i in any desired number are provided on either side of the stem 6, which permit passage of lead from chamber H to the under side of the head and to die 0. I prefer to make the upper part of this head of proper size to fit closely within chamber H, with a shoulder, 2, below adapted to fit under the cylinder-block H, whereby the head is held in place. The shoulder i may l e omitted, however, the head being of uniform diameter, as in Fig. 7, in which'case the head should be bolted or otherwise bound to the support E, as at u, so as to preventlead from entering between its under face and its seat, thr reby disturbing the accuracy of adjustment required between the die and mandrel, as

hereinafter described.

A chamber, 1, is made in the under face of this head, directly over the die and on a threaded pipe-like projection, 6 is screwed a hollow mandrel, It. The threaded socket r of this mandrel is by preference made cylindrical, as in Fig. 4, and its lower end or point is reduced to a form corresponding to and adapted to enter the opening 0 of die 0. In the lower extremity of this mandrel are made perforations r through which the electric conducting-wires w w are passed. These perforations may be of any desired number, corresponding to the number of wires required therein. 0n the surface of the mandrel, between perforations, are made grooves or corrugations T, which increase in depth toward the extremity. The purpose of these grooves or channels is to give direction to the flow of lead past the mandrel into the spaces between wires, thereby affording an unbroken wall or body of lead between and around each wire when such form ofproduct may be desired.

Heretofore a core or mandrel has been employed having separate tubular nipples extend-v ing downward into the die, through which the wires were passed, and the lead covering was given its tubular form around each wire above the points of the nipples. In such construction considerable space is occupied by the separate nipple-walls and by the openings between them. Oonsequently the wires cannot be brought close together in the cable and a large amount of lead is required for covering a comparatively small number of wires.

In my improved mandrel I do not employ. the separate nipples, but simply-form grooves in the outer surface, which give direction to the flow of lead, and the lead is formed into a tubular covering around each wire below the point of the mandrel. By this means I can make the wire-perforations r much closer together than heretofore, and consequently can cover a much larger number of wires with a given amount of lead. This, in practice, is a very important improvement, reducing materially the. cost of such cables, since the lead employed forms the principal item of expense in construction.

The hollow stem 1', through which the wires to are carried, is extended by a pipe, j, upward through the lead-chamber H.

A tubular ram or plunger, S, adapted in form to enter and fill closely the chamber H, is rigidly bolted to the cross-head B, with its central passage, 8, in line with the pipej below and the hole b above, through the crosshead. The passage thus provided to and through the mandrel may be used not only for inserting wires, as stated above, but also. as a receptacle for insulating material with which to water cover the wires, as hereinafter described.

1n the lower end of ram S is seated a die, .9, adapted to receive and fit closely upon the pipej, so as to prevent escape of lead between the die and pipe. Above the die the passage 8' b may be somewhat larger than the pipe, thereby confining friction-surface to the bearing of the die.

In the operation of this'machine the wires 20 are passed downward through perforations r into the passage E. The chamber H is filled with lead, and, while the charge is. still hot-say, as soon as it is set-power is applied to raise the piston D, and with it the blockE and the devices resting thereon.. As the plunger S enters the chamber H the lead therein will be forced through the openings t in head I, and downward through the die 0 and over and around the wires, thus forming a covering or body of lead upon them. The character of this covering will depend largely upon the relative positions of mandrel R and die 0. For example, if the mandrel be inserted well into the die, say, until the upper ends of the grooves r are at' or below the .plane of greatest contraction in die-opening c, the lead covering will be pipe-like or tubular in form, but flattened, the wires being inclosed within its interior walls in one common passage or openin "By lowering the' die, so that the grooves r are in or slightly above the plane of greatest contraction of the die-opening, the lead will be forced into the spaces between the wires, thus surrounding each wire separately by a solid body oflead, as represented in Fig, 5.-

In this operation, one function or purpose of the grooved mandrel Itis to form the separate tubular passages in the body of lead which the wires occupy, and by adjusting the die at proper height with relation to it the wires may be covered loosely or the lead may be pressed closely thereon, as desired. The range of adjustment required to effect such differences of results is small, and,in view of this, it is of great importance not only to provide means for accurate adjustment between the die and mandrel, which 1 have done by making the die adjustable, as described, in order to cause the lead to press the wires with'the desired degree oftension; but it is also important that this adjustment, which in practice must be given when the apparatus is not at work, shall remain fixed and unchanged when the parts are subjected to the heavy pressure required in doing such work. This latter feature of stability is fully securedby my improvement, and by means of it and the facility afforded for accurate adjustment I am enabled to apply a lead covering to wires previously covered with insulating material without injury thereto. i

It will be observeth that the head I, which carries the mandrel, exposes a greater area to pressure of lead on its upper face than on its lower face, or that downward pressure upon the head is greater than upward pressure upon theheadandmandrel. Consequentlytherewill be an excess of pressure upon it in the same direction as upon die 0; also, the die and mandrel-head are supported as against working-pressure by the same block of metal-or,

- in other words, that the resultant of lead pressare. upon each is in the same direction, and support is given to both as against such pressure by one and the same device. This support is direct, and the conditions are substantially the same for each. Consequently they will be effected in the same manner byany working-pressure, great or small, and their relative adjustment will remain unchanged,

mand both the die and head being supported -=oii it substantially as before, except that the "head is made of uniform diameter without the except as change is madeiutentionally by the means provided for that purpose.

In illustrating my improvement (Sheets 1 and 2) I have shown the die and head supported on and movable with the piston D; but this feature of construction may be varied without departing from my invention. For example, the block E may rest on a. solid bed and the ram S be made movable and connected with the piston. In such case the cylinder H, head, and die would bestationary, but the relationship of these parts both in adjust ment and stability would remain as in the form shown; or, as illustrated in Fig. 7, Sheet 3, the block E may be made, like ram S, to enter chamber H, the head being bolted to it, as at shoulder 27 Then, as the piston is raised the head, die, and -'plunger-like support will be carried into the eham ber H, the bolts 1* sliding inthe lugs has the piston is raised and lowered.

In practice the head moves in the chamber with considerable friction, enough to'support' and carry with it the cylinder, unless thelatter be held by other means. Consequently as the piston is raised the cylinder, with the lead therein, will also be raised, until the upper plunger, S, enters the chamber. Thefurther upward movement of the cylinder will then be arrested by the friction incident to displacing the lead in the cylinder, or stops S or other suitable means may be employed. In this modification the body of lead in chamber H is stationary therein, and the special advantage secured is in reducing friction incident to moving a body of lead under pressure through a cylinder. When the charge is thus pressed out the piston D is lowered, and the rods F or the friction ofhead [in the cylinder will draw the latter downward onto the guide and supporting-brackets K sufficiently below the plunger S to permit of easy filling for another operation. Although this modification affords the advantage of less friction and easier working, still I prefer the form illustrated in Sheets 1 and 2, on account of the facility with which the mandrel or wire-guard may be reached in case a wire should become broken or injured. To this end the cylinder H may be raised and supported by blocking, or by friction ofplunger S the nuts 11. be loosened and the block E, with die 0, be lowered. The head I, owing to the tightness of its tit in chamber H, will be held wires below the mandrel without difficulty.

.On replacing the parts the dowel-pins 0 will insure their return to proper position with relation to each other.

By using dies and mandrels of suitable form conductors of various forms may be made, either flattened, asin Fig. 5, or more or less cylindrical. The flattened form is ordinarily preferred. As such conductoris formed in the machine it is passed downward into the passage E, and, being deflected by block P, (see Fig. 3,)or other suitable device placed in such passage, it is discharged laterally through side opening, 1?. As it emerges from this opening it may be wound on a reel, ready for use, or

other disposition may be made of it, as desired. By sea-ling or closing tightly the endsof the wire-passages in the conductor as it is delivered from the machine, and placing in the hollow stem ij an insulating substance which be- IIS comes fluid or plastic under heat-as pitch, as-

phaltum, paratfine, or equivalent substancethe wires may be coated thereby. In this operation heat is obtained directly from the body of lead,- it being worked at a high temperature, and the insulating material, being rendered liquid or plastic thereby, will prevent passage of air downward. Air passage being thus arrested, there will, in the operation of forming the lead covering, be a tendency to form a vacuum in the wire-passages of the conductor. Consequently air-pressure from above will force the insulating material into such passages, filling them compactly and surrounding the wires with an insulating substance adapted to protect the wires from moistthe wire from such agencies as are liable to be conducted from without through the lead a covering, and while it may be applied directly vmandrel-head, thus forming a rigid attachto a naked wire, yet I prefer to make use of insulated wires of the ordinary kinds, in which case this covering, embedded or packed in the wircpassages under air pressure, as described, may act' not only as a preservative, but also as an additional insulator. This method of covering wires with both insulating material and a body of lead, both being done under. pressurein oneoperation and with onedevice, I consider an important improvement, and it may be practiced in connection with one or more wires inclosed within a common tube, or where two or more wires are separately embedded in a body of lead, as represented in Fig. 5, both such terms being made as desired by proper adjustment of the die and mandrel,

as hereinbefore described.

When one charge of lead is nearly exhausted from the cylinder another may be supplied readily. and quickly, and thus the lead-covered conductors may be formed of any desired length, limited only by facility for handling the same when finished.

I have shown the mandrel It screwed to the meet. It will be observed that the principal pressure upon this mandrel is upward, caused by the exudation of metal; and it is obvious ,thatotherformsofconnection may beemployed,

provided such connection affords a rigidity with respect to pressure from exuding metal.

It will be observed that in the construction described the openings 1 01, through which the lead. passes in going from the lead-cylinder to the die-cavity, are arranged on sides ofthe stem i, corresponding in position to the flattened sides of the mandrel. This is the preferable construction, because thus the metal passes directly to the sides of the series of wires, and

.has no tendency to throw them out of line or to crowd the edge-wires over toward the center, which tendency would exist if the metal were forced down edgewise as regards the band of wires.

The grooves r r also perform a function in connection with the flow of lead in the guid-' ing or spacing of the wires; but their use as space or separate wires in the process of covering them by forcing the covering material onto the wires at right angles to their longitudinal plane; but in my present invention the wires are held in proper relations by the separate perforations, and by directing the flow of lead by the side grooves, r, the wires may be arranged at very close intervals, and the expense involved in making separate pipelike nipples for each wire be avoided.

Also, in so far as the article of manufacture thus made may include patentable invention, the same will be claimed in a separate application.

I claim herein as my invention- 1. The combination of lead-cylinder H, tu-- bular support E, mandrel It, die 0, sliding wedges e, and screw-rods 0 substantially as described, whereby the die is made adjustable toward and from the mandrel.

2. In combination with the platen D atubular support, E, and lead-cylinder H, both being bound to the platen by bolts, as described, die 0, secured on the support, mandrelhead I, secured above the die, mandrel R, secured to the head between the head and die, and guides o, substantially as set forth, whereby provision is made for ready access to the mandrel between the die and head.

3. The mandrel 1%, having a series of two or more perforations, 1' side by side through its.

JO HN FARRELL.

Witnesses:

R. H. WHITTLESEY, (J. L. PARKER.

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