US1276038A - Centrifugal casting-machine. - Google Patents

Description

D. S. DE LAVAUD.

CENTRIFUGAL CASHNG MACHINE.

APPLICATION F1LED`0CT.20.19|T

Patented Aug. 20, 1918.

`5 snenswsnesr' l.

D. s. DE LAV/IUD. CENTHIFUGAL CASTING MACHINE.

Patented Aug.- 20," 191&

5 SHEETS-SHEET 2.

. INI/ENTR APPLICATION FILED OCT. 20. |9I7.

D. s. DE LAVAUD. )ENTRIFUGAL CASTING MACHINE.

APPLICATION FILED 0CT.20.19I7.

l.latelled Aug. 20, 1918.

5 SHEETS-SHEET 3- .www

INVENTU? D. S. DE LAVUD.

` CENTRIFUVGAL CASTING MACHINE.

APPLICATION FILED ocT. 20. Isir.

1,276,038. v 'Parent-@Mug 20, 1918.l

5 SHEETS-SHEET 5- NVENTOH 40 that at the end ofthe trough at which the Dmi'rni sENsAUn DE LAvAUD, or NEW YORK, N.- Y.

GENTRIFUGAL cAs'riNG-MACHINE.

imanes.

Specification of Letters Patent.

Patented Ang. 20, 1918.

Application tiled October 20, 1917. Serial No. 197,560.

To all whom. it muy Concern:

Be it known that l, DiMiTRI Sii'NsAUD DE LAvAUn, a citizen of Brazil, residing at 33 West 42nd street, city, county, and State of New York, have invented new and useful Improvements in Centrifugal Casting- Machines, of which the following is a specification. f

This invention relates to improvements in machines for centrifugally castingpipes or similar articles; the objects of the invention, broadly, being to provide a machine whereby the pipes may be made more quickly than heretofore, with a very much smaller perccntage of defectives, andwith the assuralice that `the parts ordinarily subjected to distortion from extreme heat and pressure variations will be longer lived. Heretofore the .great difficulty in casting pipes according to the centrifugal method has been that the uniformity of the product, indeed the quality of the product is dependent largely on the skill of the workman or founder. Moreover, the pouring trough and pipe-end molding pieces have been entirely or almost entirely inaccessible, so that the machine has had to be taken apart at frequent intervals for cleaning and examination. The temperature, composition and relative percentageof impurities in the molten metal all affect the product, andwith the metal being poured into a comparatively long trough` by way of Oneend of the trougi protruding from one end of the rotary mo d the making of a pipe was -a very uncertain operation, unless the workman or founder was highly skilful. Due to the length of the trough, andthe fact that the metal arriving at the far end of the trough would the other. hner-t have a'temperature considerably lower than metal was being poured, when the trough became suihciently'filled for turning to pour its contents into the rotating mold, the

trough in previous machines has become warped longitudinally afterthe casting of a few pipes, resulting in an uneven spill of the metal and consequently in the casting of pipesI of uneven Wall` thickness. Also, when the inetalhas been poured too slowly into the protruding endof the trough, the

metal has cooled and adhered to the inner surfaces of the trough, also adversely affecting subsequentlygftfglpos. When, on

of the charge.

asbeen poured too rapidly into the protruding end ofthe trough, the trough has frequently overflowed, and the cast pipe has been found to have many external defects; cold shots frequently occurring, for example, and rendering the pipe useless. Results corresponding to those deleterious results following a too quick or too slow pouring ofthe metalK4 into the protruding end of the trough' in previous machines, has also resulted, in such machines, when the metal has been poured at the experimentally determined proper rate, if the temperature of the metal has been too high or too low. In has further been found, in machines as heretofore constructed where the molten metal had to be poured into the end of a trough where thegreater length of the trough was housed in'the rotary mold during the pouring operation, that too great a ypercentage ofimpurities in the' charge of molten metal may not be detected intime; and even if detected, as a highlyf skilful worker mightdetect them from the appearance of the metal as it is being poured, all opportunity to remove the impurities, as by quick surface sweeping of the molten metal in the trough, the instant before the trough is dumped,'is not possible.

As a matter of fact, these impurities have4 never, if at all, been detected in time, in the case of a particular molten metal charge for the casting of a pipe, and have been poured into the mold with the charge, the result in each case being'that a defective ipe was formed, generally very rough on t e inside due to the action of the centrifugal -force on the impurities, the specific gravity of which is usually less than that of the other parts Further, even with a. lmixture of metal where the composition and teniperatnre are ideal. and the percent-age of inipurities very small, the inability to.v get at the trough to brush it ont., in previous inachines, where the trough after each ipe casting is only protruded at one end rom the rotary mold, have been found to be most-serious in cutting down4 the net eiciencv of each machine; since it is highly de'- sirable to brush out 'the whole interior of the trough, from end to end thereof, immediately after each casting operation, and also at suoli time, if at all possible, to brush outlthe parts coacting with or rotating with thegrotary mold to form the end surfaces of they-pipe,

The present :invention has for its object to overcome all the disadvantages above cussed, and ele-o et vthe sume time to provide Water-cooling errungenients, not only for the rotary mold, but also `for the pouring trough; deepite the tert, in. the oase oit the rotary' mold, that in solving the other prob lexus the rote ry mold ie moved longitudilinl ly hach; und ttorth to cover nd uncover come pletely 'the pcuiring trouggl'i, und despite the fact, in the cese of the pouring trough, that the latter iepermanentlyrotatably mounted, for pouring, et 'one end only.

The present invention, then, involves the provision of un improved apparatus whereby, after each casting operation, the rotary mold may he moved to uncover the entire interior of the pouring; trinigh sind also, if desired, to expose the metal-molding sur- 'taoee of one or both end pieces 'which conc-t with the rotary mold to form the opposite end Surfaces of the pipe. According to this construction, the trough 'omplctely eX-v posed while the molten tui ie being poured thereinto. @ne reeult is that the vtrough may he brushed ofi' ette-r each casting operation, :is may also Said end pieces if desired; thus, talonl 1t for granted that some impurities, at east, will he found in each charge, en unskilful attendent may he employed, his instruetions being that he mustbrush the surface of earch charge the instant after it is poured, endv the instant before the rotary mold is brought back to .simultaneously from the middle tonie-rd the two -oppositeends of the trough; and while thus Howing may he' examined by the Afounder, for temperature, eomljiositio'n und impurities, tothe detection of which herapidly becomes accustomed.

The invention also involves an errungelnent whereby the trough is thus uncovered es one etep in the operation' of the appare tus, and whereby also the pipe may be Withdrawn from the mold `axially of the trough and the mold, and yet the sequence of operations is such that the time of4 menutneturn ing pipe is 'reduced and the necessary manipulations nre those which most natueaich other with the leest Waste motion the Workmen or of the vapparatus parts.'

The invention also involves enerrangement 'whereby the mold may be watercooled at all times, irrespective of the relative positions of the trough, mold, and end pieces for Shaping the opposite ends ofthe pipe, so that the mold may be kept at u uniform ten'iperature from end to end during the casting of a pipe, and may have its temperature lowered uniformly from end to ond thereof :lifter euch extraction of a pipe cast therein.

The invention also involves en errungeinent whereby the trough muy be watercoolcd uniformly from end to end at ull times, with'the cooling water admitted to and teken from the trough adjacent to one end thereof, that ie, the end of the trough v'here it is permanently journaled to permit 1t to he rotated to pour. This Water-cooling' ot the trough has been found to be very iinportaut ne it considerably prolonge the life of the trough and combats deformation of the trough and mold which would otherwise he due to the intense heut from the molten 'nie-tui, gir i ofi' to the trough and to the mold hy radiation es well es contact.

The invention also involves en arrangement of the rotary mold and end-piece for forming' an end of the pipe, whereby extraction ot the pipe when cnet is facilitated, as well as the formation of a bell or special Hare on the end of the pipe, and the caeting thereon of significant indicia in a pipe size or quality, or'the name of the manuf facturer, is made easily possible.v

The-invention will be more clearly understood from the following description, when teken in connection with the accompanying drawings showing a preferred embodiment of the invention.

In these drawings,

Figure l is a view in side elevation, purtinily broken away and nrtially in sectiou, showing` said embodiment;

Fig. 2 is a. transverse section1 taken on the line A-Bof Fig. l and toward the right; p

Fig. 3 isA a. longitudinal sectional vien, partially diagrammatic, illustrating the rotateble pouring trough, from which the mo1- ten metal is discharged into the rotating` mold,--the 'trough in this Fig. 3 being viewed from its fa-r sidens shown in Fig. 1;

Figs. 4,- 5 and 5A are transverse sections through the mold-of Fig. 3, taken respectively on the lines 4-4,'5-5 and 5^.-5l of Fig. 3; y J

F'g. G is en enlarged detail view in longitudinal'scctiom of the rightdmnd end of the machine as viewed in Fig. 1,' showing the end-'piece for moldinlgr the ,pipe and permit-- ting,r the special significa-nt indiciu to be cast on` u special formation et the end lof the pipe;

Fig. 7 is section on the line c- Z of Fig'. 6,' lo'o'king to the right., showing scid endp-iece 'Fi 8 is an enlarged detail view partiallyv in' si c elevation and partially in ongitud1- nal section, showing the ermanent pivotal .mounting for the rightand end of the `trough as such trough. is disposed 1n Fig.

3,-this Fig. 8 showing the left.hand end of the apparatus as disclosed in Fig. 1 that is,

` jdrawa-l of the pipe formed within the rotary "myl .co-pending application,

, mold.V

VReerring particularly to Figs. 1, 2, 9 and .10, the numeral 1 indicates `I-beams upon which are mounted a sole plate 2 and a pair of arallel track rails 4.

.he sole plate is the foundation for a standard 10 integrally carried thereby, the standard 10 integrally supporting at its top a long journal 10, within which is perma nently 'rotatably mounted one end of the pouring trough 11; this arrangement being sho-wn most clearly in Fig. 8', to which momentaryreference may, lat this point, be made. The end of trough 11 beyond the journal 10 has secured thereon ahandle 11a whereby the. trough may be tiltedto .pour at the proper instant. l

0n the rails 4 are guided a plurality of wheels 9, which are mounted on and support a fixed sleeve 14 within which the rotary mold 5, is `mounted at each gend on ball bearn sas indicated at one end at 6;

.the mold 5 eing adapted to be continuously and rapidly rotated by the vmotor 7. The motor 7 drives a sprocket wheel 8, which, through a sprocket chain (not shown), drives a'sprocket Wheel 9 fixed on the rotary mold. f .The ball bearing 6,V as indicated, is preferablyw ofthe type described and claimed in Serial No. 194,97f1, filed'ocwber 5,1917. 4 h y rotary mold 5, as indicated, is preferabl iwatencooled', asfdescribed and claimed ifinycofpending application, Serial No.

194,976, filed October 5, 1917. In the present instance, the cooling water is fed into the water chamber inside the sleeve 14 and `Surrounding'the mold"5,`through a conduit 13 branching from a conduit 13n located slightly below the sleeve 14 and arranged lengthwise therewith. In order to permit the conduit 13ll to be supplied with water, under circulating or higher pressure at all times, lwhether the parts .supported .by the wheels 3 are in the operative position of Fig. 9 or that (ii-Fig. 10, the conduit 13 is secured on sleeve 14, as shown clearly .in Figs.

' and2, v-onlithe'two depending brackets 13"" on the near'sideof the machine as viewed in Fig. 1; one end of thefeondiiit 13* being closed, and the opposite end having a stufi'- ing Abox for sliding in a Huid-tight manner over a fixed feed pipe 12, A. slmilar arrangement `is provided, as indicated at 12 and 13 in Fig. 2, for the outflow of the water after passing through the moids cooling chamber; a pipe similar lto the pipe 13l not being shown for the outflow of the water,

as the depending bracket 13" may be made hollow for the purpose, pursuant to the dls.-

closure of the. above identified co-pending ap lieation, Serial No. 194,976. y

Feferring now particularly `to Figs'. 1 and 6, the tracks 4 also have mounted thereon and guide a plurality of wheels 3 journaled on and supporting a carriage 15 on which is mounted a support, comprising the parts 39, 40 and 46, for an e'nd formation of the pipe, whereb the pipe may be withdrawn from the mold and trough when the carriage 15Y is moved toward a stop hook 16 shown in i yThe carriage 15 also carries a' conical cup 45 adapted to engage stemll offset axially from the adjacent end of the pouring trough 11. The cup 45Il is an integral extension of a horizontal shaft 45 mounted in ball bearings 43 and 44. l

Referring next to Figs. 6 and 7, a sleeve 40 is clamped to an annular end piece 46 and both these parts are clamped to the sides of the machine by means of a plurality of hooks or dogs 41 and 42. The part 39 is a core for coacting with the interior conformation of-the adjacent end ofthe mold 5 to form thel bell end of the pipe shown in solidblack at 56 in Fig. 6. Adverting for a moment to Fig. 10, the pipe Ywith its belled end is shown at 56 in side elevation. Reverting to Figs. 6 and 7, tl e piece 46 is pro vided with bas relief or as the manufacturers name, as indicatedv at 47 in Fig. 7. Y V

Referring next to Fig'. 8, there is provided an annular end piece 50, complementaryto the end-piece 46 of Fig. 6, in that the endpiece 50 of Fig. 8 forms the end of the pipe opposite to the bell end shown in Fig. 6 The construction is therefore such that the surface of this end-piece 50 which molds the mrilten metal is exposed when the mold 5, with the sleeve 14 (not shown in Fig. 8)

is withdrawn in the direction of the-arrow Thus, the end-piece 50 is exposedfor eflica.-

cious cleaning, justas is the entire interior of the'trough 11, preparatory to the eastlng of each pipe.V

epressed indicia,

. the following gear. The motor 18 through a.

- ferr'edjto as the'trough 11.

This end-piece 5.0 is mounted on a' ball bearing .5l- .52 so that when the parts are in theposition shown in Fig. 1, the endpiece .G0-may be frictionally gripped by thc adjacent end of mold 5 and frictionlessly rotated therewith.

The carriage 15 has pivoted thereon a coupling hook 16 which may be swung into or out of engagement with a stud on sleeve 14, as shown in Figs. 1, 9 and 10. Obviously, when the hook 16 is in engagement with the stud on sleeve 14. the wheels 3 and 3 in effect support a single vehicle on these two sets of-wheels; \\'l1er eas, when the hook 16 is disengaged from its stud 'on the sleeve 11, the carriage 15 -inay be moved on its wheels 3 relative to the sleeve I4: on its wheels 3.

For moving the sleeve 11 on its wheels 3, longitudinally of the track rails 4, Whether such sleeveis `accompanied by the carriage 15 on its Wheels 3 or not, thereis provided suitable reducing gear 19 act u'ates 'a' chain or cable 20 soA as to exert a pull to the left on bracket 21 or a pullto the right. on bracket 22, as desired. these two brackets being 'mounted on the bottomi 01E-sleeve 14 to depend therebelow. A

.In Fig: 8, the trough 11 is shown turned 90D from the disposition thereof illustrated in the other views, in orderA to show at a glance a; preferred construction whereby the trough 11 may be water cooled from end to end thereof, by admitting .water to and .drawing off this water from the end of the trough where it is perlnancntly rotatably mounted, that is, the Iend of' the trougli housed in 4the journal 10"; the water being fed into the water jacket provided, through the passage 48 and passing off through the passage 49; The construction of the trough 11 in the present inst-ance, will be fully understood from an examination alsoof Figs. a, 4, 5 and 5^.

, ire-trough proper is not nearly. as4 long as 'the entire trough-structure, 'herein 1e- This trough proper'extends. between the opposite end pieces 29 and 30,set in a pipe 24 as shown in Fig. 3. The trough proper is lined with clay as vindicated at r28 in Figs. 3 and `The inner pipe 24` is one of 4three concentric pipes 4,-25and2G. These concentric pipes 24, 2 and26' are so-spaced that a. lplurality of' 'annular' water" circulation vchambers 31 dhd32 are provided.' The three pipes' are cut away over vthe trough proper between the end pieccs29 and30, vas shown at 2.8' in `the frnolten metal.

Figs. 3 and 4, to furnish a pouringr slot for .The outside pipe 26' is :rpertured at 35 to provide a water outlet, and at 3,610 provide a-.waier inlet, the 1ntermediatepipe 25 being apertured clearly as shownin Fig. 3 opposite the aperture 36 y ere in the outside pipe. At the end'of-the entire .trough structure opposite to the end ofbltlh structure'having the apertures 35 and 3.6, is

provided an aperture 37 in the intermediate pipe. Closing pieces 33 and 34 are provided as shown in Figs. 3, 4 and 5^ to prevent leakcation with the passage 49 of Fig. 8 {and thev same construction is provided inthe case of aperture 36 and passage. 4 9 as 'indicated in v Fig. 5^.' The operation of the'machine should be obvious from the foregoing, but such operation will now-be briefly described:

Referring to Figs. 1, 9 and 10,'assume'that I the parts as disposed in Fig. 1 are so, disposed just after a pipe 56 has been formed in the rotary mold 5'due to the tiltin pf; 'j

trough 11. As soon as the ipe 56 is so'dij fied, or so far toward solidi cation thatit .l

desirable to commence the separation-o mold and trough, the motor 18.is actuated to 1nove, by mea-ns of the cable 2 0 `and` thev bracket 22, the structure carriedlon th-- wheels 3 and 3', from the position of'Fig. 1

v hA 16B is brought into engagement with -the stud toward that of Fig. 9. Then thestop 'hookprovided therefor on carriage 15, and cou-'1 pling hook 16 isdisengaged. from the stud with' which it is in engagement now on sleeve 14. A suspended' .cradle 55, shown in Fig. 10, is then brought into position vin readiness to Ahave the pipe 56 laid thereon when extracted from the mold '5,-aiid then the motor 18 is used to exert a pull on the: 'ceb1 e in the opposite direction, so Aas to pull-on the bracket 21 to move the structure on" the wheels 3 towardthe position shown inFig. 10. thus separating the part 46 fromfthje mold and leaving the plpevexposed 11s-. v

shown in Fig. 10 forready removal from the machine. 'Howevexg before 'the structure on the wheels 3lis moved relative to the structure on the wheels 3', totransport the Sleeve 14' from the position of-Fig. `91to that lof' 115 fully exposed following the transportation 1 Y Fig. IO-that is, as'soon as the"troi1'gh 11 is of the double vehicle on the wheels 3 and 3f from' the position of Fig. 1 to Athat of Fig. 9,

a new charge of molten metal 53 -is deposited in the trough 11 dicated in Fig. D. Itw-ill be vnoted tha to the Vtrou-g en s of the trough;

pended from4 a.'ti'telilet4 being lowered lat I the properjiistanti* Before the -s trl'lcture on l n'ioved from the positionof n the wheels Fig. 9toith 'Fig..10, the workman standing at 'the trough` 11 may brushout the interior-'of 'the trough before the cher e 53'V is dumped therein, and, after such ch rae.

charge is. delv-A f V'lway between the iso' 1,ave,oss

been vdumped therein, the surface of the charge as 1t evenly fillsl the interifr of the trough may` be brushed off; and t 'e Workman who disengages the pipe 56 from the end-molding piece 46, after the structure on the wheels 3 has been moved from the position of Fig. 9 to that of Fig. 10, may brush off the molding face of the part 46. Also, whenever necessary, and when exposed, the Workman at the trough 11 may brush oil` the end piece 50 surroundingthepermanently journaled end of the trough and which forms the end of the pipe opposite the belled end. At all times the mold 5 is Wa ter cooled, and also the trough 11.

Referring to Figs. 6 and 7, it Will be seen that during the molding operation metal cast into the mold 5 to the right of the trough gradually works itself down by cen.- trifugal force toward the molding face of the end piece 46 and around the core 39.

VBy this arrangement, it is permittejdto cast identifying marks on the end face of the pipe bell, as indicated at 47 in Fig. 7 i

After the parts are' arranged as shown in Fig. 10 the pipe is gently broken away from 4the end iece 46, by properly manipulating thecrad e 55, as is Well known in the' art in 1 the machines where the pipe is attached at one end to an end portion ofthe mold, which end portion of the mold is removed from the main body of the mold to withdraw the pipe from the mold.

VIt will be noted that by .rforming the trough 11 of a plurality of substantially con centric pipes as described, the outermost pipe may conveniently act as a means whereby the trough maybe journaled in an elongated bearing, such as the bearing provided by the journal 10".` Another very important advantage, not yet mentioned, Hows from the construction of the trough as illustrated in Figs. 3, 4, 5 and 5A. Itmay first be ex plained that' the purpose of providing the filling or composition 28, usually of claygor refractory material, as brick of special form,

is to avoid cooling the -metal when molten,

` as it otherwise would be cooledif dumped into the trough-t0 strike a metallic interior thereof. The advantage of the construction of trough described herein, is-that the trough may be built up of annular members,- like the vpipes ,24, 25 and, 26, and thereby, upon making the lining 2li` of horseshoe cross sec tion as indicated in Fig. 4, the trough has parallel straight sides.

.I claim:

1. In a centrifugal castin machine, the

combination of a; rotary mo d, a rotatable trough, supporting means for the rotary mold whereby the mold may be moved lengthwisely of the trough to expose the trough, and means for rotatingv the trough to spill, a charge of moltenmetalinto the' 6 5 rotary mold when themold is arranged overlappingly of the trough, and means for dumping a. char e of molten metal into the trough intermediate its ends.

2., In a centrifugal casting machine, in combination, a rotatable trough, a rotary mold, the trough and the mold being supported for relative movement axially of the machine to expose the trough whereby the trough may beffed a charge of molten metall mold movable lengthvvisely o themachine,

and means for temporarily coupling the mold and the removable end piece whereby -the rotary mold and vthe, end piece may as one unit be moved to uncover the trou h, and thereafter the rotary mold maymoved relative to the end Vpiece to'cover the trough andO uncover a pipe just previously cast in the rotary mold and now attached to the end piece.

4. In a centrifugal casting `machine, in combination, a rotatable trough immovable lengthwisely of the machine, a rotarymold movable lcng'thwisely4 of the machine to house thetro'ugh or to completely uncover the sa1ne,a removable end piece for the mold movable lengthwisely of the machine, and

means for temporarily coupling the mold and theremovable end piece whereby the lrotary mold and the end iece may as one u nit be moved to'uncover t e trough, and Vthereafter the rotary moldv maybe moved relative to theend piece to cover the trough v and uncover a pipe just previously cast inthe rotary mold and now attached to the end piece, there being 'provided a wheeled vehicle on which the rotary'fiiild ismounte'dand fa separate wheeled. vehicle on which the removable' cnd piece ofV the rotary mold is -mounted- 5. In a centrifugalcastmg machine, 1n

combination, arotatable trough immovable lengthwisely of the machineila rotary mold movable lengthwily 5f t e machine to housel the trough or to completely uncover the same, a removable end piece for the mold movable lengthwisely of themachine, .and

means for temporarilyA coupling the mold and the removable en d piece whereby the rotary mold and the end piece may as one,

unit b e moved touncover the trough, and thereafter the rotary mold may be moved relative'totheend .piece t`o cover the trough and uncover a pipe just previously cast 1n the rotary mold and now attached to the end piece, there being provided a Wheeled vehicle onv which the rotary mold is mounted'and a separate Wheeled vehicle on which. the removable'` end piece of the rotary mold is mounted, the two Wheeled vehicles being guided on a single pair of tracks.

v6. In` a centrifugal casting machine, in -combination, a rotatablev trough immovable lengthwisely of the machine, a -rotary 'mold movable ,lengthwisely of the machine to house the trough or to completely uncover the same, a removable end piece for the mold movable lengthwise'ly of the machine, and means for temporarilycoupling the mold and the removable end piece whereby the rotary mold and the end piece may as one unit e moved to uncover the trough, and thereafter the rotary mold may be moved relative to the end piece to cover the trough and uncover' a. pipe ust previously cast in the rotary mold and now attached to the end pie-ce, there being provided a wheeled vehicle on which the rotary mold is mounted 'and a separate Wheeled vehicle on which the removable end piece of the rotary mold is mounted, there being further provided power means for moving one of the wheeled vehi cles in either direction axially of the machine and there being further provided cou- .pling means for uniting the tivo vehicles for traveling as onevunit when desired.

7. In acentrifugal casting machine, in combination, a rotatable trough immovable lengthwisely' of the machine, a rotary mold -niovable lengthwisely of the machine to house trougl'ior to c unpletely uncover the same, u removable end piece for the mold movable lengthvvisely of the machine, and means Yfor temporarily coupling the mold and the removable end piece whereby the rotary mold and 'the en d piece may as one unit be moved to uncover the trough, and. thereafter the rotary mold may be moved relative to the end piece to cover the trough and uncover a pipe just previously cast in A the rotary mold and now attached to the end piece, there being provided a Wheeled vehicle on Which the rotary mold is :mounted and a separate Wheeled `vehicle on which the removable -end `piece of theA rotarymold is mounted, there being also`provided und mounted A tioned an electric motor and drivingcon-E nections for-the rotary mold.

8. In a centrifugal casting machine, in combination', a rotatable trough, a rotary mold, means Wherebvsaid' mold duringvroetation may be moved relative-to the trough to uncover the trough, pecans for' waters cooling the mold at al1 Itimes, and means for water-cooling the trough at all. times.

bination, a rotatable trough, a rotary a mounting for the mold whereby t .o may be moved 'relative to. the trough on' the Wheeled vehicle irstrneibl9.In a centrifugal casting machine, in

combination,'a rotary mold, an end piece for the mold, an end piece for the mold at the opposite end oi' the mold, one of the end. pieces being fixed and the other end piece and the mold being movable axially of the machine to expose both end pieces, and a rotatable trough journaled in one end piece whereby the rotary mold and an end piece may be moved relative to the rernziining end piece to expose the interior oi`"the trough and' the metal-molding surfaces oi both end pieces for brushing and cleaning ll. In a centrifugal casting machine, in combination, a rotary mold, a removable end piece Jfor the mold, a removable end piece for the mold at the opposite. endof the mold, a fixed support onwbich o'nexof said end pieces is mounted, a Wheeled vee hicle on which the rotary mold is mounted, and a Wlieeled'vehicle on vwhich the other end piece is mounted. l.

12. In a centrifugal casting machine, in

combination, a rotatable trough, water,

jacket i'orined thereon. and means for maiutaining a cooling iiuid in circulation through the water-jacket independent ci the position of the trough whether for receiv ing a charge or spilling said charge.

13c In a centrifugal casting .reaching in combination, a rotatable trough comprising a pliu'ality oi annular mmbei conccntri cally arranged but spaced apart so as to` =`than the pouring slot to provide an elo11- member for the trough atgated `iournaling orie end thereof. ""'15. In a' centrifugal casting machine, in combination, a rotatable trough comprising a plurality of annular members concentri cally arranged but spaced apart so as to provide a Water chamber therebetween, the annular members heilig slotted in registry to provide a pouring slot, and means for maintaining a water circulation from end to end of 4the. trough between the two annular member-sand including conduits for admitting thecooling fluid to the trough at one end thereof and for withdrawing the fluid after circulating lthrough thetrough from said end of the trough.

16. .In a centrifugal casting machine, the combination of a curing trough permanently rotatably pivoted at one end, the

Y trough being constructed to provide a water `jacket extemling trom end to end thereof,. ineens for admltting water to ,one end of said water jacket adJacent to the end of the trough where ythe trough is permanently rotatablyj mounted, and means for withd 'awing the cooling fluid from the other end oi the water jacket and discharging said withdrawn liquid from the trough adjacent to the end of the trough which is permanently rotatably mounted.

' 17. li u centrifugal casting machine, in combi-nation, a pouring trough, means for rotating said trough when desired, and means for feeding water to the .interior of the" troueh and l'or witlnlran'ing water lrom saidinterior to cool the trough, the trough being' constructed ot a plurality otE spaced substantially concentric annular memliers` iucludiu'g an inner member, an intermediate member and au outer member, thus establishing between said members an inner chamber and an outer chamber through which water ma)v be circulated, Ythe inner and the outer chamber being in communication at one end o1 the trough, the outer chamber being in conununication with a water passage independently of the inner chalutier at the opposite end of the trough, and the inner chamber being in eou'muluication with a Second water passage iudepeudentby oli the firstmentioned `water passagey and of the outer Water chamber at the lastanentiouml end of the trough. i

1S. In a centrifugal on..-1tiug machine, a rotatable trough formed of three slybstan tially concentric spaced pipes.

19.In a centrifuga-l casting machine, a rotatable trough formed of three substantiallv concentric spaced pipes, whereby two annular chambers are prorided by the three pipes, and mea-ns for maintaining a circulation of water through the chambers so that parts of said circulation flow in opposite di rections with a pipe between to give an equilibrity of the heat in the water. y

Q0. In a centrifugal casting machine, the combination of a fixed bearing, an elongated pouring trough rotatably mounted in said bearing, a structure ino able legthwisely of the machine to cover and uncover the trough, said structure comprising a support, a ro* tary mold and means for rotating the mold; means to mold the end face. o the pipe normally carried by the structpre but separable therefrom, and means for cooling the rotary mold duriue rotat ion and irrespective ol. the position o'l said lstructure.

21. A centrifugal casting machine, comprisino, :iu combiinllion, a fixed bearing, a, longitudinal pouring trrulgh rotatably mounted there-iu` and a pipe casting nut 'rey chine movable, as a unit lengthwisely of the trough 'o uncover thetrough, said machine including a rota ry mold and ,means for mold ing an end 'aoe ol the pipe,- the last mentioned means including a Support and an endpiece member rotatably mounted on the snppoltfor abutting against an end of the rotary mold, thesupport last-mentioned bengseparalile l'ronl the rotary mold and the rotary mold being movable relative to said last-mentioned support, so that the rotary mold may be moved hack to cover the trough and to uncover the pipe cast on said end piece members 22. In a centrifugal casting machine, a dumping trough including a metallic structure of'substantially circular cross section ln'oi'ided with an elongated pouring apr-.1 turc parallel to the axis of the trough, and a lining of retract ory materiiil in the trough, ot' substantially horseshoe cross section, whereby the thickness of lining protecting the interior of the trough issubstautially uniform all over and yet the trough is provided with straight substantially parallel sides.

In testimony whereof` I have signedy my naine to this spr-icification.

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