US1307823A - Charging apparatus for centrifugal casting-machines - Google Patents

Description

1. ILL/Inn. CHARGING APPARATUS FOR CENTRIFUGAL CASTING MACHINES.

APPLICATION FILED NOVI. l9lB.

Patented J une' 24, 1919.

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UNITED STATES lrATimT OFFICE.

JAMES B. LAD-D, or filtrazione-PENNSYLVANIA, Assren'oa To UNITED STATES CAST.1

IRON PIPE a TOUNDRY GOMPANY,.OF BURLINGTomNEW JERSEY, A CORPORATION OF NEW JERSEY.

CHA-neme APPARATUS Fon. OETRIFUGAL OASTINGLMAOHI'NES.

specification of Letfersratenf.' patented June 24,11919 Applicationled November 1, 1918.- Serial o. 260,659.

Centrifugal Casting-Machines, of which the following is a true and exact description, reference being had to the accompanying drawing, which forms a part thereof.

My present invention relates to centrifugal casting machines and particularly to machines for casting relatively large cast iron pipes. The object of my invention is to provide improved means for supplyingV the molten casting forming metal to the rotating `mold of the casting machine.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to andforming a portion of this specification. For a better understanding of the in vention, however, and the advantages possessed by it reference should be had tothe accompanying drawings and descri tive'. dej scribed a preferred embodiment of my inmatter in which I have illustrated an vention.

Of the drawings:

Figure 1 is an elevation, partly in section, of the mold of a centrifugal casting machine and the apparatus for charging the same.

Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

Fig. 3 is a View taken similarly to Fig.

2 showing parts in different relative posi tions, and

Fig. 4 is a section -on the line Fig. 1, and

Fig. 5 is a section on the line 5-5 of Fig. 1.

In the drawings, A represents the revolving mold of the casting machine. The mold A is shown as a tubular body of metal provided at its opposite lends with circumfer-- ential surfaces A and A2, engaged by the mechanism, not shown, for supporting and rotating the mold during the casting operation. The mold shown is intended for cast- 1n a th mo d at which the bell end of the pipe is formed is closed by an end member B which is detachably secured in the mold body A in B. LADO, a

sa of ipe with a bell end and the end of-y any convenient way, as shown it has arearwardly extending ila-nge B4 which fits overl a circularflange J of an end pieceJ in which is also, formed a bearing J2' fora trunnion D at the end of the lling trough. The end member -B is provided with a .hol-f low boss B extending into ,the moldcavity surrounded by av dried sand core collar C, `which forms the inner surface of a short length of the pipe at the bell end. The inner surface, Bzf'of the boss B is conical with its largest diameter -at its inner end. The .end member' Bis provided with an axial socket J2 to receive a trunnion D formed at the inner endof the'mold chargingtrough.

The spigot end ofthe mold body A is'closed against the escapeA of molten metal by an f annular `member 'b ,fitting within they mold body A and adjustably secured therein as by means of the set screws 7). The position at which the member b is secured-in place depends upon the length of the' pipe 'P which itis desiredfto cast.

The charging trough Dis tubular and is' formed with ya discharge slot D2 extending alongithe portion o1 the length of the trough received in the mold cavity in-the1mold charging Operation. troughD Vis'formed with a lateral tubular extension D3 formin lthe trough filling inlet.

The charging troug D. is formed of metal and is provided with a refractory liningE.

` The trough D is manipulated by means of a bar or operating rod F rigiDdly secured to the outer end of the trough The trough is supported on a groovedl roller G-mounted in a stationary/pedestal G adjacent the'mold, and the bar F passes through a guide sleeve .Hf formed in a stationary pedestal H, which is more remote from the mold than -the pedestal G. 'The bar F .is in the form of a'rod circular in cross section (see Fig. 4) except AtV its outer end thel that at one Side it is flattened and provided I with gear teeth F', so that the bar. F is essen'- tially a' rack bar. The portion of the outer end of the bar F, received in the 4sleeve H',

When the trough 'is in' thel mold charging position Shown in Fig. 1, is provided With circular ribs F2 separated by clrcumferential withdrawn from the mold and -returned to the latter end of one charging operation and preparatory to a subsequent charging operation. With the trough inserted in the mold, as shown in Fig. 1, its molten metal contents may be discharged into the mold by rotatlng the bar F and thereby the trough D. For this purpose a hand wheel F3 is provided at the outer end of the bar F. When the trough'is thus being rotated its axial displacement is prevented by the ear I in meshwith the circular ribs F2. o prevent molten metal from spilling out of the trough through the inlet opening D8, when :the

trough is turned from the position shown in Figs. 1 and 2 to the position shown in Fig. 3, the tubular inlet D3 is extended radially outward from the periphery of the body of the trough, and is so' set and angularly disposed that when the trough is in the trough filling position with the discharge slot D2 at the top of the trough, as shown in Figs. 1 and 2, the lateral projection D3 is inclined away roln one side of the yertical plane through the trough axis at an 'angle of about and when the trough is turned into the dischar e position shown in Fig. 3, the projection 3 is inclined to the opposite side of that vertical plane at an angle of about 45C.

To provide the necessary metal at the bell end of the pipe to fill the portion of the mold surrounding the core C I have extended the trough D into the hollow boss B', so that a portion of the metal poured out of ,the trough'willfall directly on the conical inner surface Bz ofthe boss B. The metal falling against this surface B2 is carried by centrifugal action to the inner end of the surface,

and thence flows into the portion of the mold cavity for which it is intended.

The mold charging apparatus disclosed is simple in construction and reliable in operation, and because of the manner in which it is'formed and its relatively small bulk is comparatively easy to manipulate. While in accordance with the provisions of the stat utes I have illustrated and described the best form of my linvention now known to me, it will be apparent to those skilled. in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of my invention as set forth in the appended claims, and that some features of my invention may sometimes be used to advantage without a corresponding use 'of other features.

Having now described my invention, what Iv claim as new and desire to secure by Letters Patent, is:

. l. In centrifugal casting apparatus, the combination with a rotatable mold, of a lcharging trough and means for moving .it

axially of the mold .into and out of the latter comprising a stationary support adjacent the mold and a roller journaled thereon on which the trough rests, and a second stationary support more remote from the mold, and cooperating gear members carried by .the trough and said second support for moving said trough axially of the mold.

2. Incentrifugal casting apparatus, the combination with a rotatable mold, of a mold charging trough and means for supporting said trough comprising a pair of stationary supports one adjacent and the other more remote from the mold, of a roller journaled in the support adjacent the mold on which the trough rests, a rack bar secured to the trough and having a sliding bearing in the more remote support and a spur gear journaled in the more remote support and in mesh with said rack bar.

3. In centrifugal casting apparatus, the combination with a rotatable mold, of a rotatable charging trough axially movable into and out of the'mold, and means for supporting and moving said trough comprising a pair of stationary supports located one adjacent to, and one more remote from the end of the mold, a roller journaled in the first mentioned support on which the trough rests, the second of said supports being providedv with a sleeve, a rack bar secured to one end of the trough and sliding in said sleeve, a spur gear journaled in second support and in mesh with said rack bar, said rack bar having a cylindrical ortion provided with circumferential ribs a apted to 'mesh with the spur gear when'the trough is in the mold charging position, and means for rotating said trough and rack bar when the trough is in the mold charging position.

4. In a centrifugal pipe casting machine the combination with a rotatable mold enlarged at one end to form a bell end pipe and provided with an end member at its enlarged end having a tubular portionextending into the mold cavity and formed with a conical inner surface the base of which is at the inner end of said mold, and mold charging means adapted to supply molten metal along Ithe length of the mold and a ainst said conical surface.

' 5. n a centrifugal pipe casting machine, the combination with a rotatable mold enlarged at one end to form a bell end pipe and provided with an end member at its ena tubular portion extendlarged end having l cavity and formed with a ing into the mo 4conical inner surface the base of which, is at

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