US9577A - Improvement in core-bars for forming cores for casting pipes - Google Patents

Description

UNITED STATES PATENT OFFICE.

GEORGE PEAOOOK, or WEsr TROY, nnwwonir.

IMPROVEMENT IN CORBBARS FOR FORIVIING CORES FOR CASTING PIPES.

Specification forming part of Letters Patent- No. 9,577, dated February 8, i553.

To all whom t may concern-,.-

Be it known that I, GEORGE PEACOOK, of West Troy, in the county of Albany and State of New York, have invented a new and useful Improvement in Pipe-Molding, said improve- Vnient consisting in a core-har around which the sand is packed and forms the core; and I do hereby declare that the following is a full, clear, and exact description ofthe saine, reference being had to the annexed drawings, making a part of this speciiication, in Which- Figure l is a perspective view of the corebar. Fig. 2 is a plan or top View ofthe corebar placed in a coreboX. Fig. 3 is a perspective View of the core, showing the manner in which the upperhalt' of the core is rounded or linished by the sweep. Fig. 4 are sections 'showingthe manner in which the core-bars are jointed or connected in order toform cores for branch pipes, elbows, Stc.- Fig.5 shows the manner in which the core-bar is anchored or prevented from being raised by the melted inet-al. Fig. G is a plan or top view of two coreboxes intersecting each other, with the core-bars placed in them and jointed. This View shows clearly the facility with which cores may be' formed for elbows, branch pipes, Src.

Similar letters of reference indicate corre sponding parts in each of the several iigures.

The nature of my invention consists in provid-ingalozenge-shaped iron bar having semicircular or other shaped wings or projections on its lower half. Said bar, which Iterm the core-bar,7 is fitted within a core-box, and the sand packed and adjusted around it, the wings or seinicircnlar projections binding the sand and causing it to adhere to the lower portion of the bar. The sand is placed over the upper portion ofthe bar and rounded or shaped perfectly semicircular by means of a sweep.

. The bar, when properly encompassed by the sand, forms the core. The core-bar may be so arranged, as will be presently shown, as to be adapted to form coresfor elbows, branch pipes, Src., and may also be properly anchored, so as to allow pipes of any desired length to be cast.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and the manner in which the core is formed both for straight and branch pipes.

A, Figs. 2 and 3, represents a core-box, which is merely the half of a pipe cut longitudinally through its center, and which serves .the place of an ordinary pattern.

B, Figs. l and 2, is the core-bar, formed of a lozenge-shaped bar having a series of semicircular wings or projections, a, placed transversely on its lower half.

l) D are collars. One only is seen in Figs. l and 2. These collars are placed on the corebar, one at each end, and turned to fit the corebox A, or to be ofthe size required for the pipe intended to be cast.

E E are vent-rods, which rest upon the upper surfaces of the wings, one on each side of the bar.

F F are cylindrical handles by which the core-bar is lifted or raised when necessary.

will now proceed to show the manner in which the core is formed. The core-box A is of the size and form of the pipe intended to be cast. This (the core box) is properly adjusted in the sand and the core-bar placed in it,as shown in Fig. 2, the corebar corresponding in shape to the core-boX-that is, any portions of the pipe that are larger in diameter than another are opposite proportionally larger wings. (See the end b ot' the core-box and wings a in Fig. 2.) The corebar being adj usted or placed within the corebox, green sand is packed or pressed all around the lower half of the core-bar, and between the wings a, thus forming a perfectv halfeylinder ot' sand on the lower halt' of the core-bar. This being accomplished, the upper part or surface of the core'bar is covered with green sand, and piled up till it reaches a necessary height. Asweep or gage, G, Fig. 3, of semicircular shape, is then drawn over the sand on the upper part of the core-bar, by which gage the-superiiuous sand is removed or scraped off, forming a perfect cylindrical core. (See X, Fig. 3.) The sweep or gageG has small recesses or shoulders c, Fig. 3, which rest upon the upper edges of the core-box, and serve as guides as the sweep is drawn along. The larger portion of the core, which ts the part b of the core-box, is swept or rounded by a larger-sized sweep than the one G, represented. The core being now formed, the vent-rods E E are withdrawn, whereby vent-holes are left in the core for the escape of gas and steam' while the liquid metal is being poured into the mold. The core is lifted or raised from the core-box by means of the handles F F, the wings a binding and holding the sand to the lower part ofthe core. The core is then adjusted in the mold,(the corebox of course being removed,) the collars D on the ends of the core-bar resting on the ends of the iiask. Any length of pipe may be cast in this way, for the core may be anchored or prevented from raising by means of metal strips or bridges Ijl. One is represented in Fig. 5. These strips or bridges fit in recesses cut in the upper part of the core-bar, and rest upon wooden supports d d. These recesses are made at suitable distances apart, and correspond in length to the bridges, the bridges fitting loosely in them and resting upon the supports. An anchor or rod, m, rests or bears upon the upper part of the bridge, the opposite end of the anchor being secured to some permanent support. Vhen the liquid metal is poured into the mold, the anchors prevent the metal from forcing up the core. After a certain time the wooden supports d al burn out, and the strip or bridge will fall in the re-V cess and the core may be withdrawn. The end of the anchor that remains in the pipe is then cut off. Any numberof thesebridges may be employed, according to the length of the pipe. The upper part of the core-barthat is, the triangular portion-is not quite as high or as deep as the lower portion, to which the wings are attached. This is for the purpose of allowing the core to be easily withdrawn from the pipe after it is cast.

The core-bar in present use is formed of a hollow cylinder covered with small projections or knobs. This core-bar is placed on a pair of trestles and the sand pressed or packed upon the bar. A second person then revolves or turns the bar, and the superfluous sand is taken oif by a gage or board, similar to arest for a lathe. This is a slow and uncertain process and can only 4be applied for the casting of short pipe. Any length of pipe may be east by forming the core in my improved manner, and pipe may be cast of any desired thickness. The pipes cast by the inventor will sustain a pressure of five hundred pounds to the square inch.

My improvement may be applied to the casting of any kind of pipe, lamp-posts, bridgetubing, and the like. The projections or wings a, of course, may vary in shape, according to the shape ofthe article to be cast. For instance, for round pipes the wings are semieircular, for heXagon pipes the wings would be three-sided or half-hexagon, 81e. In case of elbows or branch pipes l joint the corebars,"as will be readily understood by referring to Figs. 4 and 6. Suppose l, Fig. 6, to be a main pipe, and J a branch pipe intersecting the main pipe'at right angles. I and J, I will also call eore-boxes. Kis the'corebar of the main core-box I, and L is the corebar of the branch core-box J. The core-bar L is jointed to the core-barKin the following manner: The bar L is formed of two parts,

and one end of each part is connected at opposite sides of the bar K, the two parts of the bar L being inline. The ends of each part of the bar Ldt between two wings, a a, on the barfK, and a recess, e, is made in Ithe inner sides of one of the Wings, in which a projection, f, of corresponding size, on the side of the bar L and at itsV end, fits. This projection is secured in the recess e by means of a wooden Wedge, g, which is driven tightly between the bar L and the adjoining wings. Vhen the core is formed and adjusted in the mold, the liquid metal burns out the wedges, and the core-bars become detached from each other and may be readily Withdrawn.

The old bars having the projecting knobs could not be used similar to my bar with the .transverse wings, because they could not be rammed and well packed. This is evident, for a series of knobs, even if placed in regular order upon a half-cylinder, would have spaces between them beyond the reach ofthe ram mer. My bar, when placed in the mold, has a series of transverse apertures formed bythe semi-- circular wings, and the sand in each aperture may be thoroughly rammed, there being no chance for the sand to give or spread lengthwise of the bar, for the wings serve as partitions, whereas if knobs were employed the sand would spread, whenrainmed, lengthwise of the rod and between the knobs, there being no perfect partition atany point on the bar.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isl l. The core-bar B, having transverse wings or projections a, of seniicircular or other shape, corresponding to the shape of the article to be cast, said wings or projections permitting the sand to be rammed, for forming the lower half of the core and holding or binding the sand to the lower part ofthe bar, and allowing the upper half ofthe core to be made by the sweep, as herein set forth.

2. The manner of anchoring the core-bar as herein described-viz., by means of the metal strips or bridges H, fitting in recesses in the upper surface of the core-bar, said bridges resting upon wooden supports d d, and having anchor-rods bearing upon their upper surfaces, the liquid metal burning out the wooden supports and allowing the core to be withdrawn, by which means the core is prevented from being raised or forced upward by the liquid metal as it is poured into the mold, and thus enabling pipes to be cast of any desired length.

8. The manner, substantially as herein de scribed, of connecting or jointing the corebars for forming cores for elbows or branch pipes-viz., by means of wooden wedges g g, which are the means of holding the bars to gether while the core is being-formed, said Wedges being burned out by the liquid metal when poured into the mold and allowing the cores to be withdrawn.

GEORGE PEACOCK.

Vtnesses:

H. J. HAsrINGs, PETER JoHNsoN.

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