US873170A

US873170A - Core-box.

Info

Publication number: US873170A
Application number: US34054006A
Authority: US
Inventors: Walter F Rice
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1906-10-25
Filing date: 1906-10-25
Publication date: 1907-12-10
Anticipated expiration: 1924-12-10

Description

PATENTBD DB0. 1o, 1907.' w.. F. RICE. Y com: B0X. PPLIOTION FILED 00T. 25, 19065 2 SEBETB--SIIEET 1.

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W. F. RICE.

UORE BOX. APPLIOATION FILED 00T. 2s, 190s.

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UNITED sTATEs PATENT OFFICE.

WALTER F. RICE, OF QUINCY, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

CORE-BOX.

Specication of Letters Patent.

Patented Dec. 10, 1907.

Application ned october 25. 1906. semi No. 340,540.

To all whom it may concern:

Be it known that I, WALTER F. RICE, a

4citizen of4 the United States, residing at AOne way of making such a bucket-segment is to form the buckets separately and then arrange them in a mold and pour molten metal around their ends to constitute a continuous base or support from which the buckets project either toward or away from a given center. In order to space the buckets accurately, preserve the proper alinement, and also to protect their bodies from the molten metal and prevent it from running into the spaces between them, the buckets are em. bedded in a core which leaves only their ends j projecting; the core being then placed in a suitable mold which shapes the base or sup-5 port when the metal is poured. An appara-f tus for making such a core is disclosed in my; pending application filed April 4, 1906, Se-

rial No. 309,745.

ywhich register with those in the guiding member.

In the accompanying drawings, Figure l is a plan view of one embodiment of my invention; Fig. 2 is a side elevation;'Fig. 3 is a cross-section; Fig. 4 is an elevation of a portion of a guide-bar and adjusting strip; Fig. 5 is a cross-section of thetwo guide-bars and their adjusting strips; Fig. 6 is a top plan view of the same; Fig. 7 is a perspective view of one guide-bar and adjusting strip; Fig. 8 is a side elevation of a strike; Fig. 9 is a bottom plan view of the same; and Fig. 10 is a sectional detail of a further improvement.

The core box comprises two removable side plates 1 and 2, a bottom plate 3 and end portlons 4 and 5. The latter are fastened t0 the bottom plate by screws 6, and the side plates are secured by transverse bolts 7 passing through the end portions and provided with wing nuts 8, or equivalent clampingfdevices. The upper surface4 of the bottom of the box is curved on the arc of a circle, the radius of curvature depending upon the diameter of the wheel or support adapted to receive the bucket segment when finished. The inner faces of the end portions are radial to the bottom. i

The side plates are provided with channels or recesses 9 parallel with the bottom and adapted to receive the segmental guide-bars rods 1l extending laterally through the side plates near the4 ends thereof. The outer ends of the rods are milled at 12, or otherwise formed to enable them to be readily grasped and pushed in or pulled out to adjust the guide-bars. Each rod passes through a boss 13 on the side plate, in which is a set screw 14 having a beveled end adapted to engage a V-shaped groove 15 in the rod and force the same inwardly forf the purpose of taking up any slight play which may exist after the buckets are inserted between the guides. Other equivalent means may be used in place of the screw and groove. Both of the guide-bars are movable, and in order The object of the present invention is to to insure their occupying their proper position between the sides of the box stops are provided at the ends; preferably ribs 16 on the end portions. In the opposite faces of the guide-bars are notches 17 all radial to the bottom. Each pair of opposite notches is carefully located, so that the entrance and exit angles of the buckets when secured in the base will be accurate and will comply with the requirements of economical service. Means are provided for varying the effective width of these notches, preferably by the construction now to be described: In the face of each guide-bar is a longitudinal groove in which fits a longitudinally movable adjusting strip 18. These strips have transverse notches 19 adapted to register with the notches 17 in the guide-bars. The strips are held in place by screws 20 which pass through slots 21 in the guide-bars, so that when said screws are loosened the strips can be moved lengthwise and then fixed in position by tightening the screws.

The operation is as follows: The buckets are placed in the box, resting on the bottom ywith their edges supported in the notches; which are preferably square, and of sui'licient width to allow some clearance for the bucket having the thickest edge that is likely to be used. The adjusting strips are then moved endwise until the walls of the notches therein bear against the backs of the buckets only, while the front edges of the buckets are forced against one side of the notches in the guide-bars. The strips are then secured by tightening the screws 20; one adjustment being all that is necessary for all buckets of a given shape and size. Having properly set the adjusting strip, the box is used to make a core in the 'following manner: First, space blocks are placed on the bottom 3 extending from side to side of the groove 22 therein, which is of' substantially the same width as the buckets. One of the guide-bars is moved inwardly against the stop 16 and the other is brought to approximately its proper distance therefrom. The buckets are then slipped down into the notches, and between the space blocks. rIhe set screws are then set up to force the guide-bars inwardly and rmly clamp the buckets. Sand of any suitable core-making composition is then rammed in between the buckets until it is about flush with the tops of the guide-bars. T he screws 14 on one side of the box are then backed out of the grooves in the rods so that said rods can be pulled out to slide back the guide-bar attached thereto into its recess in the side-plate. pied by this guide-bar is then carefully rammed full of sand; after which the other guide-baris withdrawn and that space is similarly iilled. The rest of the box is then iilled and rammed flush with the top of the side-plates. The completed core can be removed from the box by inverting said box, unscrewing the wing nuts, pulling out the bolts, taking off the side-plates, lifting off the connected bottom and end portions, and removing the space blocks from between the projecting lower ends of the buckets. If it is desired to leave the tenons or top ends of the buckets exposed also, asin casting a cover or baffling strip thereon, the strike shown in Figs. S and 9 can be employed. This consists of a plate 23 ilat on its under side and having flanges 24 at each end to iit down over the ends of the core box. Lengthwise of the plate is a block 25 having a concave lower edge 26 made on a curvature concentric with the bottom 3, The ends 27 of the block are radial to said curve. A groove or recess 28 is formed in the edge 26 of a width to receive the tenons or the upper ends of the buckets; the block being of a proper width to enter between the side-plates of the box. At each end of the strike are two screws 29 which can be adjusted up or down to limit The space formerly Occu' the depth to which the block can enter the core box. Ihen the strike is to be used, the sand is rammed into the box only as high as the tops of the buckets. Spacing or iilling pieces are then pressed down between the buckets until the upper surfaces of said pieces are flush with the tops oi the buckets or tenons. The strike is then placed on top of the box and is forced down until the lower edge of the block is in line with the bottom of the iilling pieces, which, with the tops of the buckets, are received in the groove 2S. The strike is then lifted oil', and the iilling pieces are removed, leaving the tenons or the tops ofthe buckets projecting. The core is then released from the box in the manner hereinbefore described.

In Fig. 10 is shown a sectional detail oll a further improvement whereby the position of the grooves in one guiding member can be adjusted forward or backward with respect to those in the other member. This has the material advantage that the core box can be used for making segments the bucket angles of which dii'ler greatly. The right hand guide bar 1() is the same as before and contains the adjusting strip 1S. The left hand guide bar 10 is provided with an enlarged longitudinally extending channel containing the carrier or guide 30 having the guiding notches 17 located in it, the said carrier being adjustably secured in the guide bar 10 by means of bolts 31, shown in. dotted lines, or by equivalent means. In the carrier is mounted an adjusting strip 1S constructed and arranged as previously described. Moving the carrier and its guiding notches forward or backward with respect to a given position changes the angles of' entrance and exit of the buckets in the iinished segment, and as it is necessary to change these angles for diiierent steam velocities and operating conditions, the importance of such an arrangement will be apparent.

I have shown the carrier in the left hand guide bar but it can be mounted. in the right hand one if desired, or both bars may be provided vwith carriers.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

Vhat I claim as new and desire to secure Yas Letters Patent of the United States, is,-

cle to be embedded in the core, a notched guiding member arranged to engage with one edge of said article to hold it in position, and a notched strip slidable along said guiding member.

3. A core-box arranged to receive an article to be embedded in the core, a guiding `member having a longitudinal groove, and

a strip adjustable lengthwise in said groove, said member and strip having registering transverse notches.

4. A corebox arranged to receive an article to be embedded in the core, guiding members in opposite sides of said box, longitudinally adjustable strips in said guiding members, means for clamping said strips, and registering notches extending transverse to the inner face of said strips and members.

5. The combination with a core-box adapted to receive an article to be embedded in the core, of a device for exposing Ithe upper end of said article after the sand has been rammed, comprising a block adapted to enter said core-box and provided With a recess to receive the end of said article.

6. The combination With a core-box, of a strike comprising a plate, a grooved block on the under side thereof, and adjusting screws at each end of said plate.

7. A core-box arranged to receive a plurality of articles which are to be accurately embedded in a body of molding material,

comprising separate means which are located able to change the position of said articles,

and a device supported by the carrier to hold said articles.

In witness whereof, I have hereunto set my hand this thirteenth day of October, 1906.

WALTER F. RICE.

Witnesses: Y

SAMUEL T. MACQUARRIE, EsTE'LLA CANNON.