US465771A - Mold for tubular articles - Google Patents

Description

(No Model.)

s. J. ADAMS. MOLD FOR TUBULAR ARTICLES.

No. 465,771. Patented Deo. 22, 1891.

mi cams PETERS cu., mom-uma., msnmdmu, n. c.

STEPHEN JARVIS ADAMS, OF

` ATENT OFFICE.

PITTS BURG, PENNSYLVANIA.

MOLD FOR TUBULAR ARTICLES.

SPECIFICATION forming part of Letters Patent No. 465,771, dated December 22, 1891. Application filed September 30, 1889. Serial No. 325,611. (No model.)

To all whom it may concorre:

Be itknown that I, STEPHEN JARvrs ADAMS, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Molds for Tubular Articles; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to molds for forming axle-boxes and other tubular articles. In these molds as heretofore formed the mold or matrix for the body of the mold was molded vertically in a flask, theupper end of the matrix being open and closed by the core, which fitted into a seat or print at the upper end thereof, and the matrix being either closed at its lower end and the core seated at the base thereof or the matrix extending through the flask and its lower end being closed by a Separate core, in which the end 0f the main 4core was seated. The gates or sprues through which the molten metal entered the moldcavity were formed at the upper end of the mold beside the core and the metal flowed downwardly into the moldcavity in iillii'ig it. It is found that in deep molds formed as above described, if the walls of the matrix or core are soft or unevenly packed, the metal will cut into the walls, carrying the sand into the body of the casting and rendering the casting rough and uneven, or in some cases useless, on account of the sand contained in the metal. In case the walls of the mold are packed too hard, however, it will not vent properly 'and it is found that the metal will not lie against it, and consequently scabs or blow-holes are formed therein. By my invention I am enabled t0 form molds in which these difficulties are overcome; and I also provide for the forming of the molds without the ordinary bottom boards.

It consists, generally stated, in a mold for such tubular castings having a matrix, a core entering the matrix and closing the upper end thereof, a runner extending entirely through the mold, and a gate connecting the base of the runner and base ofthe matrix,

these parts being contained and supported within a single flask, in combination with a level sand-bed supporting the mold and closing the base of the runner and gate.

'lo 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 1 is a central vertical section showing the patterns within the mold. Figs. 2 and 3 are central vertical sections showing two different forms of molds and showing the cores within the molds, and Fig. 4 is abottom plan view of the finished mold.

Like letters of reference indicate like parts in each. Y

In forming a mold in accordance with my invention where the mold is straight or tapering from the upper end it is formed as shown in Fig. 3, the mold-cavitiesgnot extending entirely through the body of sand; but Where the lower end of the mold-cavity is larger than the central part thereof the pattern is formed in two parts and extends entirely through the iiask and body of sand therein, and one part is withdrawn from the lower part and the other part or main body of the pattern is withdrawn from the upper part of the mold, cores being introduced into each end of the mold-cavity, as describedin Letters Patent No. 377,009, granted to me .I anuary 31, 1888.

I will first describe the mold embodying the latter construction, as shown in Figs. 1 and 2. The patterns o a for the molds and the pattern e for the runner are secured to the pattern plate or block b and extend upwardly through the stripping-plate c. In forming the mold the flask (l is placed around the patterns, resting on the stripping-plate, and the sand is packed therein in any suitable manner. I thus mold the matrices in the body of sand, which in such case extend through the body of sand and the ruimer g, extending almost to the lower end of the mold, as shown in Figs. Q'and 3. patterns, however, I form by any suitable means the gate-cavity 71 connecting the runner g and matricesf, as shown in Figs. 2 and 3. This may be accomplished by a gate-knife, or, as preferred by me, by a cylindrical outtcr passing down between the molds and cut# ting out a circular cavity, and so forming a gate to all the mold-cavities. The patterns are then witl1drawn,the pattern abeing first with drawn through the lower end, while the mold is resting on its upper end, and the main patterns Prior to the removal of the IOO ' cores being seated in the seats or prints formed for them at the base of the matrices before the mold is inverted, and these cores practically closing the ends of the matrices. The cores may have gates t' formed in the side thereof to permit the flow of the metal from the gatecavity h into the mold-cavity in case the ringcores extend beyond the gate-cavity 7l'. The mold is then inverted and a core Z is inserted through the upper end of each matrix, the core having suitably-shaped seats at its Lipper and lower ends, the seat at the upper end fitting into the print. m at the top of the matrix f and the seat at the lower end fitting into the print n in the ring oi' cup core 7o.

The finished mold may be placed either upon a bottom board or drag having a plain sanded surface or upon a suitably-prepared surface on the casting-floor, either such surface forming the base of the gate-cavity h, so that the molten metal will ioW down the runner g into the gate-cavity h and thence into the base of each mold-cavity.

The mold shown in Fig. 8 is practically the same as that above described, differing only in the fact that vas the mold-cavities are straight or tapering toward the lower end the entire patterns can be Withdrawn through the upper end, and consequently the lower' 'ends of the matrices are closed by the sand of the mold instead of by the auxiliary cores, the core-prints n being molded at the base of the matrices by prints on the patterns. such case the gate-cavity is formed before the Withdrawal of the patterns, and it coinmunicates With the runner g and the mold- Inl cavities, as shown. The cores Z enter the v matrices through the upper end of the mold and are seated in the prints m at, as shown. During the pouring of the molds the molten metal, entering the upper end of the runner, will v flow down through the same, entering the gate-cavity 7L and being confined therein by the flat surface of the casting-floor or drag. It will then flow into the lower ends of the inold-cavities and gradually rise Within the same, filling them without any cutting or like action upon the surfaces of the cores or matrices, and so insuring smooth and solid castings. I am also enabled to used green-sand cores if it is found desirable.

My invention has been described and shown as applied to a group of molds; but it is evident that it can be employed Where a single mold is formed in a flask, such as in making Wagon-skeins and other long tubular castings, the runner rpassing through the flask at one side of the matrix.

that I claim as my invention, and desire to secure by Letters Patent7 is- A mold for tubular articles, having a matrix, a core entering the matrix from above and closing the upper end thereof, a runner extending entirely through the mold, and a gate connecting the base of the runner and the base of the matrix, these parts being contained and supported Within a single flask, in combination with a level sand-bed supporting the mold and closing the base of the runner.

In testimony whereof I, the said S. JARVIs ADAMS, have4 hereunto set my hand.

STEPHEN JARvis ADAMS.

lVitnesses:

n JAMES I. KAY, J. N. COOKE.

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