US1320744A

US1320744A - de lavaud

Info

Publication number: US1320744A
Authority: US
Publication date: 1919-11-04
Anticipated expiration: 1936-11-04

Description

Patented Nov. 4, 1919.

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CENTRIFUGAL CASTING.

APPLICATION FiLED MAY 22. 1918.

5 ML OLD f /vflmeoo M D. 8. DE LAVAUD.

CENTRIFUGAL CASTING.

APPLICATION FILED MAY22.1918- 1 20,744. Patented Nov. 4, 1919.

3 SHEETS-SHEET 2.

um W501 D. 8. DE LAVAUD.

CENTRIFUGAL CASTING.

APPLICATION FILED MAY 22. 1913.

1,320,744. Patented Nov. 4, 1919.

3 SHEETS-SHEET 3.

UNITED STATES PATENT @FFIQE.

DIMITRI SENSAUD an LAVAUD, OF NEW YORK, N. Y.

CENTBIFUGAL CASTING.

Specification of Letters Patent.

Patented Nov. 4,- 191a.

' Application filed May 22, 1918. Serial No. 236,009.

p which the following is a specification.

This invention relates to improvements in centrifugal castings, and more partlcularly aims to I provide improvements 1n rapidproduction processes and machines for casting annular members, as plston-rmgs, in

groups.

The present invention has three mam ob- 'ects: 1 First, to provide a novel multiple-casting mold for casting the articles in groups and adapted to be readily taken apart after a casting operation to remove the cast ngs and to be thereafter readily reassembled 1n readlness for a second casting operation.

Second, to provide a novel chuck or supporting rotor for the multiple-mold, whereby for the first time in this art, so far as is known, expansion of the mold parts on dumping a charge of molten metal into the mold will not tend to fracture and destroy such mold parts or to jam the mold on the chuck or rotor soas to render rapid extraction of the mold from its chuck or rotor difficult if not impossible.

Third, to provide a novel form of centrifugal casting machine, and a novel process of operating and controlling the same, whereby a driving means, as an electric motor,: is used for rotating the chuck or rotor, but not for driving connection concurrently with the casting operation, so thatmomentum of the chuck or rotor is relied on to establish the centrifugal force for forming the cast articles, giving the important advantages of simplicity of general manipulation and the ability to stop rotation of the chuck or rotor by a mere brake application and without the necessity of concomitantly unclutching the chuck or rotor from its driver. In this latter connection there is preferably provided a fixed brake-block or the like, so disposed that after the completion of a casting operation, the rotor the mold of which is housing the trough may be further moved to ward the journaled end of the trough to advance an annular surface of the rotor into contact with the brake-block, to stop rotation of the mold; and this brake-block is preferably adjustably mounted so that when desired it may be withdrawn from functioning position, to permit a separate hand-actuated brake-lever, also preferably furnished, to be operated to brake the mold at the discretion of the attendant.

In several aspects, the invention includes improvements on a previous machine on which United States Letters Patent No. 1,257,325 were issued to the undersigned on February 26, 1918. In that patent, and here,

the invention is preferably embodied in a machine having a single horizontal trough, and a plurality of, preferably three, horizontally arranged rotors or chucks for the molds, the rotors being off-set radially from a vertical journal on a carriage slidable horizontally toward and axially of the trough, whereby the rotors may be successively positioned to dispose the molds successively in alinement with the trough,

preparatory to moving such alined moldto house the trough for a casting operation.

The invention-will be more clearly under stood from the following description, when taken in connection with the accompanying drawings, illustrating preferred embodiments of the invention.

In these drawings,

Figure 1 is a slde elevation of a triple mold machine of the kind above referred to.

partially broken away and showing the trough and one of the molds in section, the positions of the chucks for the other two molds belng indicated in dot-and-dash lines Fig. 2 is a transverse vertical section on the line 22 of Fig. 1, looking in the direction of the arrows, the two chucks the positions of which are shown in dot-and-dash lines in Fig. 1 being broken away beyond the section line;

Fig. 3 is a transverse vertical section on the line 33 of Fig. 1, looking in the direction of the arrows;

Fig. 4 is a transverse section on the line 4-4 of Fig. 1, looking in the direction of the arrows;

Fig. 5 is a top plan view of a modified.

form of multiple-casting mold just after as sembly, showing also parts of an apparatus which may be employed to facilitate assembly of the mold;

Fig. 6 is an axial section on the line 6-4) of Fig; 5;

Fig. 7 is a view similar to Fig. 6, showing another form of multiple-casting mold, assembled;

Fig. 8 is a diagramatic View, showing a modified rotor mounting for any type of multiple-casting mold constructed according to the invention;

Fig. 9 is a side elevation partially broken awa showing a modified form of rotor and mol end-plate, these parts having means for mounting the mold on the rotor, according to the invention, to avoid injury to the mold on expansion; and

Fi 10 is a transverse section taken on the line 10-1O of Fig. 9.

The present application is a continuation in part of my copending application Serial No. 225,389, filed March 29, 1918, the subject-matter of Figs. 9 and 10 being new matter.

Referrin to Figs. 1, 2, 3 and 4, the base of the machineis lndicated at 5.

Mounted on the base at one end is a standard 6 for supporting a rotatable trough 7.

The base carries, on its top, in line with the axis of the trough, a palr of tracks 8, for guiding a slidable support 9, made hollow for housing and moving relative to an electric motor 10 bolted in place on a boss 11 fixed on the top of base 5. A handle 12, pivoted on the standard 6 at 13, and operatively connected to the support 9 by means of a link 14, is provided for sliding the support back and forth.

- The trough carries a rear journaling extension 15, adapted to turn in bearings afforded by bracket 16 on top of standard 6, and is provided with a handle 17, whereby the trough may be turned from the chargereceiving position shown to a dumping position and back to charge-receiving position.

, Secured at its lower end to the to wall of support 9- is a vertically up-standing fixed shaft 18, the axis of which is in the same vertical plane which contains the axis of rotation of the trough 7. Rotatably mounted 'on the shaft 18 is a hub 19 provided with three threaded sockets one of which is shown at 20 in Figs. 1 and 2. The three sockets are radiall" arranged, equi distantly placed aroun the shaft 18, and so located that by fractional rotations of the hub 19 the three sockets may be successively disposed with their axes alined with the axis of rotation of the trough. Screwed into each socket is a fixed stud-shaft one of which is shown at 21 in Fig. 1. Rotatively mounted on each studshaft is a chuck or rotor 22, as shown in Figs. 1 and 2, by means of ball-bearings as indicated at 23 in Fig. 1.

' mamas.

In the machine shown in Figs. 1 and 4 each chuck has offset tluarefrom, parallel to the axis of rotation of the chuck, three equidistant fixed rods 24 so arrangvd that the cylinderdefined by the outer lines. of the several rods is coaxial with the trough. These rods are very strong and rigid.

The form of multiple-casting mold for a chuck or rotor, shown in Figs. 1, 3 and 4, com rises a series of alternately arranged thic er mold-rings 25, hereinafter referred to as the periphery molds, since they are to form the outer peripheries of'the cast articles, and thinner mold-rings, 26, hereinafter referred to as the side molds, since they are to form the sides of the cast articles. All the mold-rings carry equi-distantly arranged holes marked 27 in Figs. 3 and 4 for mounting the mold-rings on the rods 24. The holes 27, it Will be seen, are of greater diameter than the rods 24, but the cylinder defined by the outer lines of the several holes 27 coincides with the cylinder defined by the outer lines of the several rods. This novel arrangement has the advantages that during operation the mold-rings may be readily and easily slipped onto the rods 24 "for concentric rotation with the chuck, and yet during expansion of the mold laterally of such axis or rotation, on spilling the molton metal Within the mold from the trough during casting, the mold willnot be tractured or subjected to strains of any kind and will be free to expand as required, with the further result that after the casting operation the mold may be as readily and easily slipped oil the rods 24 as it was slipped on such rods preliminary to casting.

In the caseof the multiple-casting mold of Figs. 1, 2, 3 and 4, a feature of the invention, involvin the assembly of a series of alternate peripheral and side mold-rings into one substantially cylindrical unit for handling toward, from and on a chuck or rotor, with all parts of the mold fixed relative to the others, previous to mounting the assembled mold on a chuck or rotor, is embodied in the provision on each mold-ring of a plurality of equi-distantly arranged holes for a plurality of longitudinal tie-elements or bo ts 28. As shown, the holes 27 and the holes for the bolts 28 are all equidistantly arranged around the axis of rotation of the mold, with the holes 27 and the holes for the bolts 28 alternately arranged.

Before proceeding further with the descri tion of the remaining structural details of t e machine of Figs. 1, 2, 3 and 4, it may be explained that the chucks 22 are intended to be furnished in regular succession with .12 has been thrown to the left of Fig. 1 to opposite the trough, three recesses are formed in the upper surface of the top wall of support 9 as indicated at 30 in Fig. 1. These recesses are equi-distant and define a circle concentric with the axis of rotation of the hub 19. Hub 19 carries, for coactionwith each of the recesses 30, a vertical spring-held detent-pin 31 having a rounded lower end.

The peripheral surface of each chuck 22 of maximum diameter is formed to constitute a friction driven rotor 32.

In order that when the handle 12 is actuated to move the support 9 to the limit of its rightward travel, to clear a chuck and its mold away from trough 7 the chuck may be rotated at a high rate of speed by the motor 10, the motor has secured on its shaft a friction driving wheel 33. According to this arrangement, just after a group of mold-rings is slipped-onto the rods 24 of a chuck '22, and the hub 19 is fractionally rotated to bring these mold rings and the trough into alinement, the handle 12 may be moved to an extreme left position to contact rotor 32 and friction wheel 33 long enough to rotate the chuck at a high rate of speed such that on next throwing the handle to the right to cause the mold to surround the trough 7, the momentum of the chuck persists long enough to permit the trough to be dumped with the mold and the molten metal to be spread by centrifugal force in the mold-chambers 34 and congealed therein to form the group of cast articles, before the speed of rotation of the chuck dies down to a redetermined desirable minimum. According to this arrangement, also, as soon as the group of cast articles is formed in this mold, the handle 12 may be moved toward the left to an intermediate position to clear the mold and chuck away from the trough and yet not far enough to contact rotor 32 and friction driving wheel 33. The foregoing will perhaps gain clarity if it is explained that with the parts as shown in Fig. 1,'the handle 12 is not in any of its stop positions and may be assumed to be in course of being operated to clear the mold away from the free end of the trough or to advance the mold farther toward the journaled end of the trough.

In order that a mold overlapping the trough ma have its rotation stopped at the discretlon of the attendant, a brakelever 35 is pivoted on standard 6 and provided with a brake-block 36 as shown in Fig. 1. This lever is normally held in the rotating mold surrounding the trough 7 is to be stopped, the brake-lever is actuated by the attendant to press the brake-block against the peripheral surfaces of the moldrlngs and stop the rotation of the mold. In order, however, to provide a very simple and in a certain sense automatic means, preferably to be used as the normal operative agent for stoppingthe rotation of a mold wherein a group of articles has just been cast, a fixed brake-member 38 is secured on the standard 6 and so positioned that by moving the handle 12 a distance to the right beyond the point to which the handle 12 is advanced to cause the mold to completely overlap the trough for the casting operation, the brake-member is contacted with the adjacent face of the adjacent end mold-ring. This brake-member 38 is fixed by means of a screw 39 in a suitable recess in the standard 6. If desired, the brake-member 38 may be rendered inoperative by loosening screw 39, moving the brake-member back into the recess and then tightening the screw.

The arrangement whereby momentum is utilized for rotating a mold during casting, so that simple friction brake application may instantly stop the rotation of the mold at the instant desired, facilitates production and constitutes a feature of the present invention.

The complete sequential operation of the machine already described may be summarized as follows:

With the trough 7 in the charge-receiving position illustrated, the motor continuously running, and the handle 12 thrown to a position slightly short of its extreme left position, the mold-rings are slipped onto a chuck 22 other than the one opposite the trough. Then the hub 19 is fractlonally rotated to bring the first mentioned chuck into alinement with the trough. Then the handle 12 is moved to its extreme left position to contact the rotor 32 and the friction driving wheel 33. As the rotation of the chuck commences and its speed rises toward the required maximum, a charge of molten metal is delivered to the trough, as from a suitable ladle (not shown). Then the handle 12 thrown to the right far enough to cause the mold on the chuck completely to overlap the trough, and the trough is dumped. As the mold rotates to form the cast articles in the chambers 34, another group of mold-rings is slipped onto another chuck 22. When the articles are congealed in the chambers 34 of the first mold, the handle 12 is moved a slight distance farther to the right to cause the brake-member 38 to stop the rotation of the mold, and then as soon as this occurs, the handle is moved to its intermediate position where the mold is cleared away from the trough and the position illustrated by a 'spring 37. When a advance the mod into contact with the brake-member 38 to stop the rotationof the mold. As the second chuck is being thus iotated, the mold on the first chuck, together with the articles cast therein, is removed from the first chuck, and at the same time a third mold is positioned on the third chuck. When the cast articles. are congealed in the mold on the second chuck, the said chuck is moved to permit the brake-member to stop rotation of the mold,.and the parts are operated as before to brin the third chuck opposite the trough 7; an so on in continuous sequence. As soon as a set of moldrings are removed from a chuck, after such chuck is stop ed and withdrawn from the trough and c eared away from the trough by a fractional rotation of the hub 19 the nuts on the outer ends of the bolts 28 are removed and the mold-rin s disassembled and the cast articles release for collection, machining, heat treatment, or other handling. Figs. 5, 6, and 7 show alternative forms of molds adapted to be previously assembled into a fixed porta'ble unit from a pluralit of longitudinally arranged peripheral an side mold-rings, preparatory to mounting such a mold on a chuck or rotor, and also certain contri'vances for facilitating such previous assemblies.

Referring to Fi s. 5 and 6, the side moldrin s are indicated at 40 and the periphery mold-rings at 41. In this case the mold also includes end-

rings

42 and 43, of slightly different construction from

the'rings

40 and 41. It should, however, be understood clearly that end-rings for an assembled mold need not be of different construction from the

rings

40 and 41; and, therefore, when the term end-rings is used in the appended claims, there is meant a ring of any shape and size provided such ring is one of the terminal rings at opposite ends of the assembled mold, even though such ring may also function as one of the side mold-rin s. In Figs. 5 and 6 it will be seen that t e rings 40 and 41 have a common external diameter, which diameter, however, is less than the diameter of the end-

rings

42 and 43. The

rings

40 and 41 are not provided with any transverse holes other than their center trough-receivin openings. Onl the end-rings are provi ed with such oles, which, as in the construction of Figs. 3 and 4, comprise a plurality of alternately arranged holes for having passed therethrough the rods 24 of a chuck 22, such holes being marked 44, and holes for receivin the longitudinal elements or bolts, such olts being marked 45. These holes are arranged in a circumferential series concentric with themold-

rings

40 and 41 of a diameter such that the holes will lie beyond the bounds of the mold-

rings

40 and 41. Each bolt 45 is secured at its lower end, as indicated in Fig. 6 and as by a suitable threading and rivetmg operation in the hole provided therefor in the lower end-ring 42. To one side of each hole 44 in both end-rings is provided a transverse hole 46 there being three of these holes also, with the holes 44, the holes for the bolts 45 and the holes 46 all equi-distant and arranged in regular alternation. The holes 46 are so located that when the moldrings 40 and 41 are between the end-rings and arranged in a concentric stack concen trio with said end-rings, the cylinder defined by the inner lines of the several holes 46 coincides with the cylindrical outer surfaceof the stack of mold-rings. A plurality of vertical guide rods 47 ne for each of the holes 46 in the two end-rings, are fixedly mounted at their lower enlarged ends in a table 48 as indicated in Fi 6.

In operation, to assemIile a mold, the lower end-ring 42 is arranged over the rods 47 '.so that the upper ends of said rods enter the holes 46, and the end-rin is dropped to the bottom of the rods as s own. Then the side mold-rings 40 and the periphery mold-rings 41 are deposited in a stack as illustrated upon the end-ring 42 and between the rods 47, being precisely centered by the latter. Next the upper end-ring 43 is arranged over the upper ends of the rods 47 so that said rods enter the holes 47, and the upper ends of the bolts 45 enter the holes provided therefor. Then the end-rin 453 is lowered to rest on the uppermost lnol ring of the stack, and the nuts are applied to and tightened on the protruding upper ends of the bolts, so as to cause the various mold-rings to exert sufliciently heavy face pressures relatively to each other, to frictionally lock the parts together. Finally the thus assembled mold is lifted up, clear of the rods 47 and the table 48, ready for mounting upon a chuck or rotor. It will be observed that this arrangement has the advantages ovcr that of Figs. 3 and 4, that-the speed of assembly of each mold is materially increased, and that the mold-rings are of rather simpler construction.

Referring to F'ig. 7, an arrangement having some of the characteristics of the mold of Figs. 3 and 4 and some of the characteristics of the mold of Figs. 5 and 6 is disclosed. Accordin to this construction the top and bottom si e mold-rings, marked 49,

are the end-rings, and these two rings, as.

well as the periphery mold-rings, marked 50, are provided with suitable holes through which are passed a plurality of nut-carrying longitudinal tie-elements or bolts 51. The intermediate side mold-rings are shown at 52. The contrivance for facilitating the assembly of this mold, comprises a centering standard 53 for the intermediate side mold-rings, a cylindrical collar 54 near the bottom of the standard 53 for supportin and centering the lower mold-ring 49, and atable 55 on which the standard and collar are fixed.

In operation, to assemble the mold, the bolts 51 are passed upwardly through the holes provided therefor in the lower endrin 49, and with the heads of such bolts against the lowerface of this end-ring, the latter is lowered over the standard 53, centered on the collar 54 and rested on the table 55. The mold-rings 50 and 52 are now stacked in regular alternation, and finally upper end-ring 49 is put in place, and the nuts applied to the upper ends of the bolts 51 and tightened. The side mold-rings are set concentric by the bolts 51 and the periphery mold-rings are set concentric by the standard 53. When the nuts are tightened on the upper ends of'the bolts 51 sufficiently to cause the various mold-rings to exert heavy face pressure relative to each other to frictionally lock the periphery mold-rings in place, the assembled mold is lifted up clear of the standard '53 and the table 55 ready for mounting on a chuck or rotor. It will be observed that this arrangement has the advantage over that of Figs. 3 and 4, that the speed of assembly of each mold is increased, and the advantage over that of Figs. 5 and 6, that the periphery mold-rings are positively held concentric. p

All the mold structures so far described have been characterized by circular endrings or end-plates defining a cylinder within which all intervening parts of the mold are contained. As illustrative of the man ner in which a previously completely assembled mold of the present invention ma be mounted on, for rotation, with a chuc or rotor not necessarily including rods or the like equivalent tothe rods 24 of Figs. 1, 2, 3 and 4, attention is directed to Fig. 8, wherein'parts of a machine similar to that of Figs. 1, 2, 3 and 4 are shown. Here the sliding support is marked 56, the friction driving wheel is marked 57 and the chuck or rotor comprises two freely revoluble cylinders 58 and 59 mounted, preferably by means of ball-bearings (not shown), on parallel horizontal shafts 60. The cylinder 58 may have a friction driving rotor 62 se-' cured thereon for coaction with the driving wheel 57 According to this arrangement, the particular type of previously assembled mold favored, indicated by the dot-and-dash circle 62, may be merel deposited on the two cylinders 58 and 59 or rotation to have centrifugally cast therein the group of arholes, the cylinder 58 then acting as adriver and the cylinder 59 as an idler.

Referring finally to Figs. 9 and 10, a part of a chuck or rotor is shown at 63. This chuck has an offset flange 64, and also a cylindrical axial support 66, rounded at its free end and offset from a collar 67.

Only a part of the mold is shown, which, for example, is of the type shown in Figs. 5 and 6, with the exception that the endplate 43 of Figs. 5 and 6 is omitted, and there is substituted a special end-plate 68 and a plane, unbored side-mold plate 69. TiS-eGIements 4'?" are employed as in- Figs. 5 an (J i The special end-plate 68 is provided with three hinge-mountings 70 for arms 71 threaded at their free ends and carrying adjustable wing-nuts 71. These hingemountings are spaced 120- around the endplate 68.

Similarly spaced around the peri hery of the chucks flange 64 are three 5 set ears providing nests or open recesses within which the free end-portions of the arms 71 may be set as shown, preliminary to tightening the wing-nuts 71'.

' It will be seen that the construction just described also provides-a centering mounting for'the mold, such mounting including a stud on the chuck and a socket on the mold, so that great expansions of the mold are not a source of trouble or danger; whilev .the centering mounting, by also including the arms 71. and their coacting parts, permitsthe chuck to transmit its rotation to the mold.

. It may 'be found desirable to interpose a. spherical member between the wings of each wingsnut and the extension offset from the flange 64 against which it works; for instance, by providing a rounded bottom for the shank of the wing-nut as shown. Then, when the mold expands, and consequently the arms 71 are rocked, the latter operation is facilitated.

It will have been. seen that each of the multiple casting molds herein described is illustrative of the feature of the present invention whereby preferably a previously completely assembled mold-unit is provided, with all parts of the unit fixed relatively to the" others. These novel arrangements have the advantages, as already indicated, that during operation the assembled multiplecasting mold may be readily and easily positioned on the machine for concentric rotation with the trough, and yet during ex pansion of the mold laterally of the axis of rotation, on spilling the molten metal within the mold from the trough during casting, the mold will not be fractured or sub- &

jected to strains of any kind and will be free to expand as required, with the further result that after the casting operation the mold maybe as readily and easily removed from the machine as it was positioned thereon preliminary to casting. But in this connection it should be understood, since the present invention involves other features of novelty than the preferred provision of a previously assembled multiple-casting preliminary to the casting of a series of articles by a single dumping of the trough.

I claim:

1. A multiple-casting mold mountable on and demountable from a supporting rotor of a centrifugal casting machine, for casting simultaneously a group of disconnected parallelly disposed annular articles, said mold comprising a pluralityv of concentric alternately arranged periphery mold-rings and side-surface moldrings secured together to constitute one cylindrical unit for handling toward, from and on the centrifugal casting machine with all parts of the unit fixed relatively to the others, the periphery mold-rings being thicker and of greater diameter than the side-surface moldrings and all mold-rings being of one piece integral construction.

2. A multiple-casting mold mountable on and demountable from a supporting rotor of a centrifugal casting machine, for casting simultaneously a group of disconnected parallelly disposed annular articles, said mold com rising a plurality of concentric alternate y arranged periphery mold-rings and side-surface mold rings releasably secured together to constitute one cylindrical unit for handling toward, from and on the centrifugal casting machine with all parts of the unit fixed relatively to the others, the

periphefiy mold-rings being thicker and of greater meter than the side-surface moldrings and all mold-rings being of one-piece integral construction.

3. A multiple-casting mold mountable on and demountablefrom a supporting rotor of a centrifugal casting machine, for casting simultaneously a group of disconnected parallelly disposed annular articles, said mold com risin'g a plurality of concentric alternate y arranged periphery mold-rings and side-surface mold rings, and securing means comprising two end-rings and tie-elements combination with a rotor of a running longitudinally of the mold so proportioned and arran ed as to cause ad acent mold-rings to exert ace pressures relative to each other, the periphery mold-rin s belng thicker and of greater diameter t an the side-surface mold-rings and. all mold-rings being of one-piece integral construction.

4. A mold as described in claim 1, wherein said n'iold-rings have circular concentric outer peripheries of equal diameters.

5. A mold as described in claim 3, wherein certain of said rings have. transverse openings through which the tie-elements are passed.

6. In a centrifugal casting machine, in combination, a rotatable mold support, and a multiple mold, said parts having a centering mounting including a stud and a socket with the stud carried by the support and the socket carried by the mold, the parts being so constructed and arranged that expansion of the mold causes movement of the mold relative to the support while permitting the support to transmit the rotation to the mold.

7. In a centrifugal castin machine, the combination with a rotor, of a plurality of supports carried by said rotor, and a moldring, forming part of a mold, having a plurality of spaced transverse a ertures through which may be passed sai supports, each aperture having a greater area than the cross-sectional area of its support at the point whereat saidaperture surround the support.

8. In a centrifugal casting machine, the lurality of parallel supports carried by sai rotor, and a multiple-casting mold to be mounted on the supports comprising a plurality of alternately' arranged periphery mold-rings, sidemold-rings and end-rings, secured together to constitute one cylindrical unit with all parts of the unit fixed relative to the others, certain of said rings having a plurality of spaced transverse apertures through Which 110 may be passed said supports, each aperture I having a greater area than the cross-sectional area of its support at the point whereat said aperture surrounds the support.

9. Ihe art of operating a centrifugal 116 casting machine, of the type wherein there is rovided a dumping trough and a plurahty of rotary molds mounted for successive positioning op osite the trough and then movement relative to the trough to 120 house the trough in that mold preparatory to dumping the trough, which consists in rotating each mold, as it is disposed opposite the trough, up to a predetermined speed, then causing relative movement between said mold and the trough to cause the mold to house the trough, and then dumping the trough while dependin on momentum to rotate the mold at the spec requisite for cantrifugal casting.

10.11: a centrifugal casting machine of the type wherein there is provided a dumpingtrough and a plurality of rotors each including a rotary support and a mold thereon, with the parts arranged so that the molds may be successively positioned opposite the trough and then moved relative to the trough to house the trough in that mold preparatory to dumping the trough, the combination of a friction driving surface carried by each rotor, a friction driving wheel rotating in a fixed plane, and means for moving a rotor away from the trough and to engage it -friction surface with said wheel to spin the rotor up to a predetermined velocity and for then moving the rotor to house the trough and 'to move its frictional surface out of contact with said wheel.

11. A casting machine as described in claim 10, wherein a brake is pro ided to engage an annular surface of the rotor to stop rotation of the rotor, after utilizing the centrifugal force set up by the mo mentum of the rotor to make a casting, preparatory to a movement of the rotor to uncover the trough; and means are provided to relatively move the brake and rotor to actuate the brake.

12. A casting machine as described in claim 10, wherein there is provided a brakeelement for engaging an annular surface of the rotor to stop rotation of the rotor, on an operation of said rotor-moving means to cause a slight continuation of the troughhousing movement of the mold after dumping the trough and forming a casting in the mold.

Signed at New York, in the county of New York and State of New York this 21 40- day of May A. D. 1918.

DIMITRI SENSAUD on LAVAUD.