US331582A

US331582A - Fvjachsne for making tubes from hollow ingots

Info

Publication number: US331582A
Authority: US
Publication date: 1885-12-01
Anticipated expiration: 1902-12-01

Description

(No Model.) v '4 Sheets-Sheet 1.

' S. P. M. TASKER.

MACHINE FOR MAKING TUBES FROM HOLLOW. INGOTS. No. 331,582. Patented 1190.1 1885 wi'ru asses:

' (No. Model.) 4 8heat B--Sheet 2.

8. P. M. TRIBE- mumnm r011 um TUBES mom nonnow meotrs. N0. 331,682. Patented B60. II 1885.

. 7 b, \NVENTOR- WITNESSES:

Nb Model.) 4 sh ets-sheet a. S. P. M. TASKBR.

MAOHINE FOR MAKING TUBER FROM HOLLOWINGOTS. No. 331.582; Patented Dec. 1, 1885.

(No Model.)

S.P.M .TASKER; V MACHINE FORMAKING TUBES PROM HOLLOW INGOTS.

No. 331.682. Patented Dec. 1. 1885.

In; "gm. damn-n m I ii 4 Sheets 8heet 4.

UNITED STATES PATENT OFFICE.

srnrrrnn P. M. menus, on PHILAD LPHIA, rnmvsrnvnms.

MACHINE FOR MAKING TUBES FROM HOLLOW moors.

SPECIFICATION forming part of Letters Patent No. 331,582, dated December 1, 18 85.

Application and July e. ces. Serial 1r. fiasco. (No model.)

To all whom it may concern.-

Be it known that I, STEPHEN P. M. TASKEB, a citizen of the United-States, residin in the city and cohntyof Philadelphia; and to of 5 Pennsylvania, haveinvented certain Improvements in Machines for Making Tubes from Hollow Metal In'gots and for Reducing Tubes or Rods, of which the following is a specification. p

Apart from the intended employment oi my machine forreducin and also for straightening tubes and rods, t eobject of myinvention is the manufacture of a tube from a hollow cylindriform metal ingot by rolling; either hot :5 or cold, by means of the machine ereinafter described, the said ingot down and out upon a mandrel atleast of the required length of the tube to be formed, thereby eompacti and consolidating the substance of the me of the ingot, thinning or reducing the latter in thickness and elongating it until the required pro ortions are attained. The ingots which I employ are tubular or of a hollow cylindriform structure, of any metal, and either open at both ends, closed at one end, or closedat one end and provided through such closed end with an aperture for theitractionrod of a mandrel.

As my machine is of especial applicability to the making of steel tubes, I contemplate also the employment of a steel cast ingot of a character invented by ine, two ap 'lications' for patents for which were filed in t eUnited' States Patent Oflice uponthe 14th day of May,

1885, and respectively numbered 165,695 and fieretofore in the art of metal rolling two or more pairs or sets of equal-sized concavefaced rolls, the two rolls constituting the re 40 spective sets or airs oi which, being laced the one over e other, have ere each other-that is to say, have beeuadjusted in such manner that vertical planes respectively projected from their respective longitudinal 4 5 axes have intersected each other at other than a right angle-have been in successive disposition in the same machine employed for rounding, straightening, andsizing tubesand rods, the said tubes orrodshaving been passed through the passes of the successive sets in a direction which may, for the urposes of explanation, be described as rig t angular to a a suitable housing obliquely side by e do or one over the other, or spirally,

'nal axis of the set,

eachanel all at an an =introduced through a .tndinaiiy between or throughfxsoto speak, the

- combined common imaginary longitudinal axis of each pair of rolls, or in a direction much more nearly ri ht angular to than parallel with the 10 itud nal axis of each individual roll of one pair. Heretoi'ore, also, in the art of metal rolling two-or three equal-sized rolls having concave working-tacos have been arran ed in p as it were, around a common central imaginary longitudiso that the axes of the respective rolls forming such set have been inclined to'each other in differentplanes, and le to the said common Ion itudinnl axis, which is that of the article to rolled, the said article having been pass extending longirolls, (which pass, as is well nown, is an extended straight bearing obtained between the roll-faces in a line bisecting the" angle of inclination of the rolls,) and the'said machines as such having been employed for rolling,- finishing, reducing, straightening,and smoothing rods, tubes, shutting, and other cylindrical or tubular articles-which receive aspiral or rotary and progressive movement from the rolls, which all revolve in the same 80 dircctiomjand notonly form the article to a true cylindrical shape", but at the same time feed it forward.

I am not aware that sets of rolls arranged in the foregoing manner have been arranged in series.

Assuming 'a set of rolls of the character last abovedescribed as a given type, I ma assume a set of rolls of the character first a ove described as another given type, and may doiiue the distinguishing characteristic of the two typ es to be the direction in which the article to be rolled is passed through the set of rolls-that is to say, whether t he passed through them in a d rection right angular to g 5 what we may term their common axis, as in the'oase 01' the rolls first described, or par allel orcoincident with said common axis, as in the case of the rolls last above described.

I have discovered theta superior memhantable tube of metal, but especially a steel tube, can be economically and successfully manufictured either from a tubular metal inget or especially from a hollow steel cast ill-- angle to its nei hbors, so that the concave surfaces of all of t e rolls form a circular pass, and, inpassiug over the surlhoe oi the tube or rod, hug it like a swage and touch it at every part, the reducing-passes of which sets are successively smaller, the rolls of which sets may, if desired, be successively arranged so as to breakjoints, and thereby act upon every" portion of the surface of the article to be rolled, and all of which rolls are positively re I volved in opposite directions.

In employing the foregoing machine for making tubes from ingots, a mandrel adnptcd to be rotated with the ingot upon it, and at least of the required length of the tube to be formed from said ingo is passed through the passes of the sets in a irectiou right angular to their common face plane or axis, as Ii'or convenience term it, upon which mandrel the substance of the metal of the ingot is by the rolls compacted and. consolidated, and the ingot itself thinned or reduced in thickness and elongated until the required proportions are attained. A. rod or tube to be reduced or straightened is also passed through in a similar direction.

Apparatus embodying a cod form of my invention is represented in t e accompanying drawings, and described in this specification, the particular subject matter claimed as novel being hereinafter definitely specified.

y In the accompanying drawings, Figure 1 is a face elevational end view of a set of rolls cmbodying my invcutiomand composed ofa. series of three similarly-inclined overlapping rolls of the character hereinafter desoribed, sight being taken in a direction right angular to the common face plane or axis of the set. The view is in the nature of a. fr mentury detail, but part of two of the rolls 'ng shown.

The view also represents inseotion, not however, to exactly correct proportions an curvstores, the two opposite segmental framin plates in connection with which the roll whic is shown completed is housed, together with the boxings for the journals of the said roll and an adjusting-arm connected with one of said boxings. Fi 2 is a perspective view of an apparatus em odying my invention and composed of a. series of two sets of rolls, each of which sets is composed .of three rolls,and is of the character represented in El 1. Fig. 3 is a central vertical longitudinal s desectional elevation through the apparatus of Fig. 2, one of the rolls of each set. however, not being 1 shown in section. Fig. 4 isaporspectivevicw of one of the sets of rolls represented in F1 2 and 3, sight being, however, taken from c opposite side from that from which sight in Fig. 2 is-t'aken, and the set represented being are lettered D. ni

the first set of rolls or that the rolls of which 5 is a f mentary partially sectional part ally-clevat oual detail of a rotatable mandrel which Iflnd it convenient to employ when employing my machine for makin tubes from hollow metal ingots.

Simi or letters of reference indicatecorrcsponding parts.

In the drawings, A represents any suitable bed or foundation for supporting the housings within which the rolls are journaled.

T is a tube, the direction oi movement of which is represented by the arrow in the drawin s. 1: the drawings no representation is made of any means for handling, or, if desired, for

occasiouing the advance or retraction of the tube, for the reason that I assume such rcpre-' sentation to be unnecessary, as any device for manipulating the tube into the passes of the rolls is adapted for employment. Some such device is, however to be employed.

B are a series of transverse vertical standards, between which are disposMl'frame-plutee Gforsupporting the boxings or hearings or thojournaleor axles of the rolls, and which in the re ion of theirsupport of said hearings or journ s are conveniently curved, so as to be of suitable segmental form to facilitate a movement of the boxiugs or journals of the rolls for the adjustment of said rolls.

In the form 05 apparatusshown, in which there are three rolls to the set, there are conveniently six frame plates between each pair of standards, the frame plates and standards together constituting simply a framing for the support oithe rolls. The housings in the form of apparatus shown in the drawings-and it is to be borne in mind that the series ofsets may contain a greater number of sets of rolls than. two-support two successivelylaced s'etsof rolls having a series composed 0 three rolls to a set, the rolls of the first of which sets are marked ID, and the rolls of the second of which sets E. The passes of the successive sets are successively of smaller diam story This is conveuiently efi'ectuoted in the following manner: The three rolls of each set are relatively of the same size; but the concave working-surfaces of thetwo rolls of the second set are more filled in, so to speak, than the working-surfaces of the'rolls of the first setthat is to say, this diameter of the central portions of the rol s of the second set is greater than that of the rolls of the first set-so that the normal pass of the second set is diametrically smaller than the normal pass of the firstset. This normal relation of diminishing passes is to be preserved, whatever number of sets of rolls happens to beemploycd. The rolls of each set are respectively inclined at an angle to each other,(it being preferable that theangle should be as slight as possible,) so that the axis of each roll is inclined with respect to the axis fore may be said to similarly overlap. Their relative positions, from which there can be no departure except by mutual adjustment, are fully represented in Fig.1 of the draw in s.

EH16 journaling or mounting oi. the rolls of each set and the means for adjusting? the rolls oi each set are preferably precise similar throughout any number of sets-whio may be employed. I will therefore describe the same with reference to but one set of rolls-via, the first. Each roll is, as stated, concave as toils central .portion or acting face, to which face or portion the letters D are in Eli. 1 shown applied. roll is on eachend eyond its tions, togetherconstitutingshafts o the 170 1:, are composed of conical portions d and. cylindrical portions (it, Beyond the said-eylindrie cal portions each roll is provided with journals or axles d, all as clearly represented in said Fig. 1. In the second setof rolls the letters of e a? respectively designate theconieal portions, the cylindrical portions, and the journals of the rolls E of said second set. The 'ournals are conveniently incased in boxings which are mounted so as to have a movement in slots or ways G-formed in the frame-plates of the housing. If desired, the boxings can be dispensed with and the journals be simply entered within said slots. I prefer, however, to employ boxlogs. The curvature oi'the segments of the frame-plates issi milar-astoall the plates, and struck from a radius equal to one-hall of the length of each roll,-so that the length of each roll between its frame-plates is conveniently equal to a diametric line betweentwo o pos'ite frame lates which support a ven rel The rolls 0 each set are so mount that their conical ortions' respectively face, as represented in 1. r V In rder conveniently toeflectuete'the move ment of the rolls so as to slightly alter their 5 relative angular disposition, and thereb onlarge or contract the diametric extent 0 the pass formed between them, I have connected with each boxing, or with the axles of the rolls, an nddjusting-arm, H, which is conveniently 5o passe through aslotted flan e, I, erected from or connected with a. frame-p ate, the said arm being threaded and provided with lock-nuts i, whereby the arm,and consequentlythe boxings and the journals of the rolls, can be locked in 5 5 predetermined adjusted pos1tions.

In the drawings, for clearness of illustration, I have represented the adjustin -arms as applied to but one end of each m] It is, however, to be understood that the areapplied to each journal or boxing of can end of each roll.

By virtueof the slots or ways in the said metal frame-plates and the adjusting-arms the movement of the rolls of each set for increasing ordiminishingthe diameters oftheir asses becomes both certain and easy. The ots or ways in opposite frame-plates are disposed at ed with the axle-boxingsin sai central portion prolonged, and the rolon aportions 4 ofthe said teeth.

a slight angle to each other, so as to facilitate the movements of the rolls in adjustment.

A. suitable arrangement or disposition of the frame-plates and the slots-therein is represent ,ed in the drawings.

The slots or ways for the journals of the rolls and the nut-provided adj noting-arms connect jways together constitute simply a OOmt-POBIBB roll-adjusting oontrivance, the ofilce o which is to permit of and render easy theadj ustment of any given actor of all the sets ofrolls at difi'erent-relw tire angles, sothat the rolls may approach more closely together or separate, so as to increase or diminish the diametricextent-of the passes between them and adapt them for employment-with tubes or rods of varying-dialm eters. Any other-adjusting device operating to a similar result may, however-, be substituted in the stead of the foregoing. W-h'en axle-bearings are not employed, f means for rew taining the journals of the rolls in fixed positions must be applied directto the'journals.-

As a'gearing to occasion the positive driving of each of the rolls of each set in opposite direction, I have provided the following our wtrivance, which is perhaps as well adapted to the, pur 'ose as' auy other, althon h other means o driving may of coursebesu titn'te'd in its stead: J isa shaft journaied inthe standards conveniently below the rolls in a positiouparallel to the line of passage of the product to be operated spam This shalt is provided with toothed pinions K, which are engaged with the spur-teeth of two composite IOU spur and crown wheels, L, the -crown-teeth of i which wheels L are engaged with the teeth of the crown-wheels M, corresponding in N114 her with the number of the rolls and fixedly mounted upon similar projecting extremities of the roll-journals, as will beoiearly understoodby a reference to the dmwin'gs; The crown-teeth of the composite spur and "crown wheels and the teeth ofthe orown-wheelson the rolls are of proper inclination and-of such depth as to permit ofa given adjustment of the rolls without causing the disengagement The composite s or and crown wheels are axially apertured an mounted upontubular bearings N, supported from the standards. The tube passes through these hearings in its passaget-hrough the machine,- and-is conveniently directed in its passage by bell-mouths O or other guides applied to the standards.

As will be readily understood, when motion is imparted to the driving-shaft motion is impartedto the composite spur and crown wheels, t and thereby motion in opposite directions is also imparted to all of the crown-wh sons to occasion the revolution of all of the rolls of a given set in opposite directions, with the result that the tube, rod, or otherarticle be ing passed throu h the rolls is rapidly and evenly reduced, t e whole rolling-suriace of each roll bearing upon the said tube tonohin it at every part, rolling out inequalities, an

causing it to take on a spiral progressive motion in its passage through the machine.

When my machine is employed for making tubes by using in connection with it a man- 5 drel, P, at leastaslong as the tube to be formed, the said mandrel is conveniently adapted to be rotated by being swiveled in a mandrelhead, Q, Fig. 5, which is actuated to its advance or retraction by any such means as are well known to iron-masters.

. Having now described what I believe to be a convenient embodiment of m invention, and at the same time described t e operation of the machine, it is proper for me to add that I believe myself to be the. first to use a mandrel capable of rotation about its longitudinal axissnd of the length of the tube which is to beprodnoed, in conjunction with a series oi sets of three or more correspondingly an ulady-disposed or overlapping and positive ydriven concave-faced mils having by sets successively diminishing, passes, by which arrangement it is possible to reduce the external diameter of an ingot placed upon the mandrel,

2 and, -if desired, by adjusting the rolls after each use, to client a continued reduction until said ngot becomes a tube of the desired thickness of substance and of no greater length than the mandrel.

3o ltisof eourseobvious that while the housing for containing and themeans for retaining the adjusted rolls which I have represented and described are well adapted for the purpose, yet that they are not essential to my invention.

5 The special adjustinggievices described, or

others operating to an tantially the same result, however, permit of the adjustment of the rolls to accommodate any size of article to be rolled within their range of separation. It is,

0 however, proper to'state that, although I have herein recited as the hestconstruction that the concave working-surfaces of the rolls of the second set should be more filled in than the work hag-surfaces of the rolls of the first set-- thatis to say, should be of greaterdiameter at their central portions-than the rolls of the first set, and so on throughout the series, yet all of the rolls of all of the sets may, if desired, he of the same diameter, and the sucoemivelyo diminishingidiameters of the passes be secured simply by ustment of the rolls of suoceedin set 0 rolls.

The met 0d ofdriving the rolls which I have represented is a good one. It is, however, as already stated, obvious that other driving machineryjmaybc employed, or that the ears may be changed when the adjustment 0 the rolls issuoh as to occasion the se aratiou of the teeth of the crown-gears, in w ich event wheels having longer teeth are to be substitut d, an several sizes of gears may be thus employed with the machine. It is of advantege to increase the speed of each subsequent setof rollsto a d as neoessarytotake up what would 0th so bethe undue stretching of the material.

The in o to or rods ma be rolled down eith er 'hot 0mm, I

When a mandrel is employed, it may be driven at a speed greater or less than that of the rolls, and is, when so driven, preferably driven by a power independent of the power employed to drive the rolls.

The spiral or revolving progressive motion to which an ingot on a mandrel, and with it the mandrel to which it for the time being adheres, or to which a tube or rod under process of redundant; subjected, prevents finning or irregularities of any kind, and therefore, tends to produce a uniformly cylindric and v marketable product,

hen a mandrel is employed, it may be extracted from the tube after rolling by stretching the tube, by loosening the mandrel, and by extracting the latter by any suitable means,

It is obvious that my machine is to be contradistinguished from a machine of the class hereinbe ore referred to in which two or three equal-sized rolls having concave working-surfaces have been arranged in a suitable housin obliquely side by side, or one over the, ot er, or spirally, as it were, around a common central imaginar longitudinal axis of the set, and in which e pass of the set isextended longitudinally between or through, so to speak, the rolls, as in machines of the fore going class, the bearing being only as to each roll upon a line, and each roll revolving in the same direction, the capacity for reduction is reduced to a minimum and the machine ada ted for strai hteningonly; whereasinmy :11 inc, in whi therolls are disposed ates small an angle as possible, the rolls onto their acting faces completely encircle the tube and maintain itas if inc swage, instead of biting upon it in a series of longitudinal straight lines of pressure, between whichliues therein no contact of the rolls with the tube, so that there is nothing to prevent the tube from spreading between the said lines of bite.

My rolls act in reducing the metal much as the rolls of ordinary rolling-mills, with, however, the advantage of a revolution being im: ported to the tube, so as to cause theunit'orm reduction and train oi its surfaces. While :1 5

IIO

it is preferable that t e passes of the succeeding sets should successively diminish-ether; is to say, diminish in strict oonsecution-set by set and without variance, omission, or alternation, yet all the results which flow from consecutive diminution may be obtained by making, for instance, two consecutive or ad: joining sets of a given and the same diameter gasses, by making the two immediately sucingcousecutiveor adjoining sets of a less but at the same diameter of pass, and by making the two fnrtherimmediately-succeeding consecutive or adjoining sets of-a still less but of the same diameter of pass. This arrangement, or one kindred to it-,-the num, her or series of sets of similardiameter of pass employed not'being vital-is not desirable;

331, can 7 s but it is manifestly embraced within my invention, and the terms successive or grad ual diminution herein employedarc not to be understood as employed with literal exactness.

While I have represented and herein described each set of the rolls as being composed of a series consisting of but three rolls, it is yet proper for me to state that I do not restrict to myself to the employment of a series consistingof but, three rolls, as it will he obvious to any mechanic that four, five. or evenagreatcr nu mher of rolls may be, under suitable modifications of housing and means of adj ustmeut. r5 employed to produce the same result as that which 'I obtain by thence of the said three rolls. Of course a larger number of crown-wheels would have to be employed, and many minor changes in the mounting and :0 mode of adjustmeutof the parts would have to be resorted to; but, as is'obvious, the few j ture of a'scries of sets of concave-faced rolls, all of the rolls of which are arranged at an angle to each other and each roll at a common angle to its neighbors, so that the concave sun faces of all of the rolls form a circular pass throu h which the article to herolled is passed in a irection right angular to the common axis of the set, and all of which rolls are adapted to revolve in opposite directions,

which is the most important fcatnrcot' my in:

vention, would be preserved in any such arrangement of increased series.

I do not claim or seek herein to cover in con- 3 5 nection with sets of rolls of the character herein set forth which are provided with positive mechanism for driving them, the invention of the arrangement of the rolls in series, as I have made this feature the subject of 49 claim in another: application, which I have designated Oase O, No. 3,? and executed and filed contemporaneously with thisappiication. Nor yet do I claim herein the housing provided with segmental frame-plates; not, again, 5 the roll-adjusting devices, as these features constitue the subject-matter of another aipplication coutem oraneously executed and led, and dcsignutcc l by me Case 0, No. 1.

Having thus described my invention, I 50 claim- 1. In a machine for making tubes from hollow metal ingots, or for reducing tnbesor rods of metal, the combination of a series of sets of concave-faced rolls, each of which sets consists of a series of three or more rolls arranged at an angle to each other, and each roll at a common angle to its neighbors, so that the concave sur aces of all the rolls form a circular pass, through which the article tobe rolled 6 is passed in a direction :ri ht angular to the common axis of the set, an the passes of such series of sets diminish successively in diameter, and mechanism for revolving all of the rolls of each set in opposite directions, substantially as set forth.

2. In a machine for making tubes from hollow metal ingots, or for reducing tubes or rods the set immediately preceding, so that the all of the rolls of each set in tions, substantially as set forth.

, of metal,

'therehysuch that each set of r0 of metal, the combination of a series of sets of concave-faced rolls, each of which sets con-- sists of a series of threeor more rolls arranged at an angle to each other, and each roll at a common angle to its neighbors, so that the concave surfaces of allot the rolls form a circular pass, through which the article to be rolled is passed in c direction right angular to the common axis of each set, and the concave working-faces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls ofpasses of the series of sets gradually diminish in diameter, and mechanism for revolving opposite direc- ,3. In amachine for making tubes from hollow metal ingots, or for reducing tubes or rods 7 the combination of aseries of sets of concave-faced rolls, each of which sets consists of a series of three or more rolls arranged at an angle to each other, and each roll at a common angle to its ueigh bors, so that the concave surfaces of all the rolls form a circular pass.

throu' h which the article to be rolled is passed in n irection right angular to the common axis of theset, and the passes of such series 5 of sets successively diminish in diameter, slotted segmental frameplates for the journals of the rolls of each set, the arrangement being Is is capable of an independent adj ustmcnt, and mechanism for revolving all of the rolls of each set in opposite directions, substantially as set-forth.

4, In a machine for making tubes from hol low metal ingots, or for reducing tubes or rods of metal, the combination of'a'series of sets of concave-faced rolls, each of which sets consists of a series oi three or more rolls arranged at an angle to each other, and each roll at a common angle to its neighbors, so that the concave surfaces of all the rolls forms. circular pass, throu h which the article to be rolled is passed in a irection right angular to the common axis of the set, and the passes of such series of sets successively diminish in diameter, slotted segmental flame-plates for the journals of the rol s of each set, means for securing the fixed ad'ustmeut of the journals of the sets of rolls wit respect to their segmental frami plates, the arrangement being thereby sti t; that each setof rolls incapable of an inde endcut-adjustment, and mechanism for revo ving all of the rolls of each set in opposite directions, substantially as set forth.

5. In a machine for making tubes from hollow metal ingots, or'for reducing tubes or rods of metal, the combination of a, series of sets of concave-faced rolls, each of which sets consists of a. series of three or more rolls arranged at an angle to each other,- and each roll at a common angle to its neighbors, so that the concave surfaces of all the rolls form a circular pass through which the article to be rolled is, passed in a direction right angular to the common axis of the set, and the concave working-faces IIO Corrections in Letters Patent 331,582.

of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the series of sets gradually diminish in diameter, slotted segmental frame-plates for the journals of the rolls of each set, means for securing the fixed adjustment of the journals of the set of rolls with respect to their segmental framing-plates, the arrangement being thereby such that each set of rolls is capable of an independentadjustment, and means for revolving all of the rolls of each setin opposite directions, substantially as set forth.

6. In a machine for making tubes from hollow metal ingots, or for reducing tubes or rods of metal, the combination of a series of sets of concave-faced rolls, each of which sets consists of a series of three or more rolls arranged at an angle to each other, and each roll at a common angle to its neighbors, so that the concave surfaces of all the rolls form a circular pass, through which the article to be rolled is passed in a direction right angular' to the common axis of the set, and the passes of such series of sets successively diminish in diameter, slotted segmental frame plates for the journals of the rolls of each set, adjustingarms connected with the journals of the rolls of each set and with the framing, the arrangement being thereby such that each set of the rolls is capable of an independent adjustment, and mechanism for revolving all of the rolls of each set in opposite directions, substantially as set forth.

7. In a machine for making tubes from hollow metal ingots, or for reducing tubes or rods of metal, the combination of a series of sets of concave-faced rolls, each of whichsets consists of a series of three or more rolls arranged at an angle to each other, and each roll at a common angle to its neighbors, so that the concave surfaces of all the rolls form a circular pass, through which the article to be rolled is passed in a direction right angular to the common improvement in 95, and 113, and paged, in lines 1, 26, 47,

should be re of the case in the Patent Office.

Signed, countersigned, and sealed [SEAL.]

Oountersigned R. B. VANCE,

upon the application of Stephen P. Tasker,

Machines for Making Tubes from Hollow Ingots, errors appear ID i 1 and in line 76, page 5, the word each should read the ad with these corrections therein that the same may conform to the record axis of the set, and the concave workingfaces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the series of sets gradually diminish in diameter, slotted segmental frame-plates for the journals of the rolls of each set, means forsecuring the fixed adjustment of the journals with respect to the frame-plates, the arrangement being thereby such that each set of rolls is capable of an independent adjustment, and mechanism for re volving all of the rolls of each set in opposite directions, substantially as set forth.

8. In a machine for making tubes from hollow metal ingots, or for reducing tubes or rods of metal, the combination of aseries of sets of concave-faced rolls, each of which sets consists ofa series of three or more rolls arranged at an angle to each other, and each roll at acommon angle to its neighbors, so that the concave surfaces of all of the rolls form a circular pass, through which the article to be rolled is passed in a direction right angular to the common axis of the set, and the concave workingfaces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the series of sets gradually diminish in diameter, slotted segmental frame-plates for the journals of the rolls of each set, adjusting-arms connected with the journals of the rolls of each set and with the framing, the arrangement being thereby such that each set of the rolls is capable of an independent adj ustment,and mechanism for revolving all of the rolls of each set in opposite directions, substantially as set forth.

In testimony whereof Ihave hereunto signed my name this 17th day of July, A. D. 1885. STEPHEN P. M. TASKER. In presence of- J. BONSALL TAYLOR, JOHN J OLLEY, Jr.

It is hereby certified that in Letters Patent No. 331,582, granted December @1885,

of Philadelphia, Pennsylvania, for an the printed specification requiring correction, as follows: On page 5, in lines 61, 78, and 71, the word such should read which and that the Letters Patent this 24th day of August, A. D. 1886.

Acting Oommissionercf Patents.

Corrections in Letters Patent 331,582.

should be re of the case in the Patent Office.

Signed, countersigned, and sealed [SEAL.]

Oountersigned R. B. VANCE,

upon the application of Stephen P. Tasker,

Acting Oommissionercf Patents.