US489188A - Core-barrel - Google Patents

Description

(NoModel.)

J. V. SMITH.

GORE BARREL.

Patented Jan. 3, 1893.

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JOHN VALENTINE SMITH, OF RESERVE, ASSIGNOR OF ONE-HALF TO JOHN C. PORTER, JR., OF ALLEGI-IENY, PENNSYLVANIA.

CORE-BARREL..

SPECIFICATION forming part of Letters Patent No. 489,188? dated January 3, 1893. Application led January '7, 1892. Serial No. 417,264. (No model.)

To @ZZ whom t may concern:

Be it known that I, JOHN VALENTINE SMITH, a resident of Reserve township, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Core-Barrels; andI do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to core barrels, its object being to provide a core barrel for use in connection with the making of green sand cores for large hollow cylindrical castings, such as air chambers, reservoirs, dac., in which are formed end openings that are materially less in diameter than the body ot' the casting.

Another object of my invention is to provide a core-barrel which can be easily vented and one in which the parts composing the same can be easily taken apart and readily taken out from the interior of the casting as soon as it is formed.

To these ends my invention comprises, generally stated, a hollow bar with openings therein for venting the same, and placing around the same one or more supports or braces, said supports or braces being semi-cin cularin form and having Wedges thereon for engaging with said hollow bar to hold the same in position.

It also consists in certain improvements in these parts which will be more fully hereinafter set forth and claimed.

To enable others skilled in the art to make and use my invention, I will describe the same more fully referring to the accompanying drawings in which Figure l is a perspective view of my improved core-barrel; Fig. 2 is a sectional View of a mold ready for casting, showing some of the parts in full lines, and Fig. 3 is a detail view of oneend of the cylindrical casting showing therein one of the supports or braces ready to be taken out.

Like letters indicate like parts in each of the gures of the drawings.

I have shown my improved core-barrel in connection with the casting of air chambers or reservoirs, though it may be used with the making of any other kind of cylindrical castings requiring large cores and whose ends are contracted in order to form openings which are smaller than the main body of the casting. Around the hollow barA I place the supports or braces l), there being generally two of these supports or braces employed in the castings above described, one at or near each end thereof, although any number can be used, three being shown in Fig. l. The supports or braces h have the bearings c which tit loosely around the hollow bar A so that they can be adjusted to place, while extending out from the bearings c are the arms d for supporting the semi-circular bars e at their outer ends, said sen1icircnlar bars e being preferably with the lugs or projectionsfon each side thereof in order to take into the sand composing the core and give stronger and better support thereto. Hinged at g in bearings 7i on :said arms d are the wedges i which engage with the hollow bar A atj and so lock the supports or braces b thereto.

At one end of the hollow bar A is the fixed head a, while at the opposite end of said hollow bar A is the removable head a which has the projection a? fitting into the interior of said hollow bar. The removable head a has also the openings a3 for the insertion ofa bar to assist in carrying it, or moving it around while in the mold. These heads o. a enable the flask 7o containing the mold k to titaround the same through the medium ofthe openings Z in the cope n and the openings m in the drag o, as is shown in Fig. 2.

In order to vent the hollow bar A, a number of small holes or perforations p are bored or formed therein, so permitting the gases to enter the interior of the hollow bar and escape through the opening a* during the casting operation. In case it is desired to vent the hollow bar A at both ends, another hole a5 can be made in the removable head a eX- tending through the projection a? into the hollow portion as thence to the open air. In order to further assist in bracing and supporting the core-barrel, a horizontal brace q may be connected with the supports or braces h by resting on top of the semi-circular bars e, said horizontal brace having the projections r extending down from the bottom thereof into the sand composing the core.

For the purpose of forming the core, the coro-barrel is then placed in the core-box, the

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sandscomposingthe core is compacted around the same and around the support-s, and extends out at each end, as at t, around the hollow bar A until the fixed and removable heads a, a', are reached corresponding in diameter to said heads a', a2, and so forming the size of the openings u, u required for the ends of the casting c afterward formed. These castings have the iiange end lu and the round end v2, the round end c2 materially aiding and enabling the operator to take out some of the parts composing the core-barrel from the interior of the casting, as hereinafter described.

The operation and use of myimproved corebarrel are as follows:-Thc supports or braces b are first placed around the hollow barA by means of the bearings c and adjusted to the desired distance apart, when by means of the wedges Il coming in contact with the hollow bar A they are firmly held in place, the corebarrel is then placed in a core box, the inside of which is of the shape of the interior and slightly smaller than the casting to be formed, and the horizontal brace q laid upon the top of the semi-circular bars c of the supports or braces b which are hung from the hollow bar A and extend down near the bottom of the core, the top of the core requiringlittle or no' support, being supported by the hollow bar A and the sand supported by the supports or braces 1),'. sand is then fed thereto and the core duly formed, after which the core-barrel with its core is then taken out of the core box and put into the ask lc, the outside circumference of the mold having been previously formed therein, the part or side of the core barrel containing` the supports or braces b being toward the bottom of the ask 7c,the fixed head ct and removable head a of the hollow bar A resting in the openings m in the drag o. Thecope nis then placedthereomthe openings Z of which tit around the fixed and removable heads a,a;the mold is then ready for the pouring of the molten metal into the same, the gases generated in casting pass through the openings p into the hollow bar A and escape through the openings a4, a5, in the fixed head a, thereby providing a core-barrel which will ventitself during the casting operation. After the mold has become sufiiciently cooled to permit handling, the cope n; and drag o of the flask 7c are then taken away, and the casting put upon its end, so that the sand contained therein will be forced out through the end openingu of the casting when the operator by means of a hammer or other suitable instrument strikes the blows against the removable head a or the free end of the hollow bar A, so forcing said hollow bar out through the casting and, at the same time, releasing the wedges t from contact with the hollow bar A, and thus allowing the supports or braces b to free themselves from the hollow barA and so drop into the bottom of the interior of the casting. After all the sand has been taken out of the casting, the operator turns the casting on its end and shakes or rattles the same until the end of the horizontal brace q gets near or protrudes through the end opening u of the casting, when it is withdrawn therefrom after the hollow bar A and sand have been taken out or with the-sand from the interior of the casting. In order to get out the supports or braces b from the inside of the casting, all that is necessary is to turn the casting up on its end and shake or rattle the same until one of the supports or braces b gets near the lower end of the casting, or its end protrudes through the end opening u when the operator, by catching hold of the protruding end, can easily withdraw the support or brace b out of the casting c in a circular line, and the round end c2 of the casting c allowing the support or brace b to pass around the casting/0 untilthe bearing c reaches the opening u', which, being larger than the bearing c, allows it to come out so that the whole support or brace l) can be withdrawn from the interior of the casting c, as shownin Fig. 3. The other supports or bracesbcan be withdrawn in the same manner. It willthus be seen that my improved core-barrel will vent itself, thereby overcoming the objection heretofore found in having to make openings for the gases to escape after the molding operation. It can be easily operated and renders excellent support to the core so that there is no liability ofthe corebarrel breaking down as the struct-ure is strong and durable in its parts, very inexpensive, and can be easily separated and taken apart and all its parts removed from the interior of the casting through a Very small opening, and so overcoming the greatest diflculty heretofore found in the manufacture of these cylindrical castings.

.What I claim as my invention, and desire to secure by Letters Patent, iszl. A core support or brace having a bearing for the core bar, an arm extending out therefrom and asemi-circularor curved bar formed only on one side of said arm, substantially as and for the purposes set forth.

2. A core support or brace having a-bearing for the core bar, an arm extending outtherefrom, and connected to acurved bar, said arm having a wedge thereon adapted to engage with the core bar and hold the support or brace in position, substantially as and for the purposes set forth.

3. The combination of a hollow perforated core bar, a support or brace having a bearing on said hollow bar, and an arm extending out therefrom and connected to a semi-circular or curved bar, substantially as and for the purposes set forth.

In testimony whereof I, the said JOHN VAL- ENTINE SMITH, have hereunto set my hand.

JOHN VALENTINE SMITH.

Witnesses:

LEWIS MoMULLuN, J. N. Cooxn.

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