US6013A - Improvement in molding and compressing cores - Google Patents

Description

No. 6,013. l PATENTEDJANnQ, 1.8149! o. WARNER.' MOLD-ING ANDC0MPR'Bss1NG C13-RBS.,

nire Sra-res PATENT rrrcn.

CHAPMAN yW'ARNR, OF LOUISVILLE, KENTUCKY.

IMPROVEMENT IN NIOLDIG AND COMPRESS'ING CQRES.

Speciiication forming part of Letters Patent N0. 6,01 3,y (lated January 9, 1849.

To a/ZZ whom, 1115 may concern:

Be it known that I,- CHAPMAN WARNER, of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and Imv proved Method of Constructing the Cores and proved manner of`forming pipe-cores; and

those on sheet 2 represent my'iinproved manner of forming the molds for casting pipes in. I will first proceed to describe my improved method of forming pipe-cores.

S S are the posts, and L L are the transverse bearers of the frame-work which supports the parts made use of in' the formation of cylindrical cores:y l l I form an adjustable core-box in the following manner: A is the metallic base of the core,l box let into and secured to the bearers L L flush with their upper surfaces, as shown in Fig. 2. A longitudinal quarter-circle groove is formed in the upper side of the base A, which forms about one-fourth the core-box. Upon the top surfaces of the* bearers L L, I place the sliding sections B B, formingthe sides of the core-box, the inner edges of which rest upon the base A, and have quarter-circle grooves formed in them corresponding to and parallel with the groove in the base A. The sliding sections B arel wedgeshaped. To the outer or oblique edges of the sections B B, I connect the forcing-wedges C C by means of the plates b b' with descending lips or anges projecting from the upper surface of the inner edges of the forcing-Wedges, and tting into grooves near the outer edges of the upper surfaces of the sections B B,.as sho'wn in Fig.

2. The outer edges of the forcing-Wedges C C have grooves formed in their under sides which receive the ways d d, rising above the bearers L L, on which they freely traverse "back and forth, and which prevent anylateral play of the wedges. The longitudinal movement of the forcing-wedges will bring the corebox' sections B nearer to or remove them farther from each other, and will preserve their inner edges perfectly parallel with each other.

When `the inner edges of the sections B are resented in Fig. 2.

brought to the edges of the groove in the base A, the respective grooves Vin each will form A three-fourths of a circle. Motion is communicated to the forcing-Wedges C C by means of racks a a, securedA to their under surfaces, which match into the pinions G G on the driv. ing-shaft D. The shaft D works in suitable bearings, and is driven by the crank B, or b any other appropriate means. I,

F F are pieces of plank or metallic plates,

vplaced over the core-box sections B B and" forcing-wedgesC C, and confined in any con- -venient or suitable manner.

' E is the top ofthe core-box, having a groove in 'its under surface corresponding with fthe grooves in the base and in the sides of the boX. The edges of the box-cover E are inclined and itted accurately into the space between the inner edgesof the covering-plates F F, as rep- Ihe box-cover E is connected to the arms I? P, which arms are hinged to one of the side covers, F, as shown in Fig.

l. It is also jointed to the togglejoint levers Q Q, by which the cover is forced down into its place when the sand has been placed in the box for the formation of a core. A

N N are the side posts rising from the longitudinal beam M, and O is the cap of thegallows-frame to which the upper portions ofthe togglejoint levers Q Q are jointed.

I form the core upon a metallic tube, H. The improvement in this tube over the core-y tubes heretofore used consists in the division of it by a longitudinal slit extending its entire length. The edges of the dividingslit in the core-tube are separated from each othera sufa icient distance to allow the core to diminish in size by the effect of the contraction of the metal forming a pipe in cooling, and thereby prevents the strain and injury to the pipe so frequently caused by unyielding cores. The tube H is retained in the center of the corebox by the bearing-plates J J, as represented in Fig. 1. 'Ihe bearing-plates J J are conned at one extremity by joint-pins inserted into the outer sides of outer bearers, L L, andv their other ends are supported by the springcatches K K, made fast to the front ends'of the central bearers,'L L, and projecting to the -right and left, as shown in Fig. l. The core# tube is retained in the recesses formed for its Y reception in the bearing-plates J J by the'eapl l A of the press.

pieces f, which are hinged tothe plates and l }ig.`6representsl a measure correspondingshut down over the tube. The capipieoesff also serve with the bearing-plates to close the ends of the corebox. In forming avc-ore, I raise the cover E of the core-box andseparate the sides B B thereof to a suitable and proper distance from each other, and placeone-half the requisite quantity of sand required for the core, which I determine by measurement, between the two sides upon the base A. I

then place the tube H i-n its bearings and cover it with the same quantity of sandirst placed upon the base of the core-box. The cover E is next forced down into its place between theV i plates FF, and the operation is completed by `forcing the sides B B up to their proper place for forming a perfectly cylindrical core by the coating of sand around the tube H. As soon as the core has been formed, as abovesetforth, the tube H is relieved of its bearings by detaching the springcatches K K from the plat-es J J and allowing them (the springplates) to descend. The top E and thesides B B ofthe core-box are then withdrawn, and

' the core is lifted out and placed in its proper position for use, or for drying preparatory to being used.

` The object of giving the core-tube H an elastic bearing is to enable the pressure to be equaland uniform on all sides of the same should there happen to bea larger quantity of sandon one side than on the other.

I will now proceed to describe my improved method of forming the molds which receive the cores before described` preparatory to casting pipes therein, in which description reference will be had to the drawings on Sheet 2.

Fig. l is a perspective View of apress made use of for pressing the sand with the requisite compactness into the half-flask. I is the bed y 3/ and z z are arms projecting forward from each end of the bed upon a line with its upper surface. The arms y yand z z serve as supports and guiding-ways for the reception of the bottomless forming-box composed ofthe sides U W and the ends k k, andl l the pattern V placed within the box. The ends lc lc are permanently secured to the back U of the forming-box, and the front W is inserted into vertical grooves in the ends k k, from which it can be readily removed.

'I proceed to form a half-mold as follows: I draw the formingbox onto the arms y y, in front of the bed and platen of the press, and place the pattern V within the box. The cnds of the base of the pattern rest upon the inner arms, zz. Thelugsss, projecting from thesides and ends of the base of the pattern, fit accurately against the sides and ends of the form ing-box, preventing any horizontal movement of the pattern within the box and leaving an opening at the sides and ends of the base of the pattern for the escape of surplus sand. I place a hopper, h, within the forming-box, resting upon the outer edges of the base of the pattern, as shown in Fig. 5.

'and taken to its appropriate place.

in length with that of the hopper h, and also with the length of the forming-box, in which I measure the sand required for placing in the hopper h. I fill the measure with sand and empty it into the hopper h, which covers the pattern V,'asrrepresented in Fig. 5. I then strike the sides of the hopper with Ysufficient force to settle the sand together and keep itin a compact form to allow the hopper to be drawn from the sand. After withdrawing thel hopper I place the halfilask X over the sand and slide the forming-box in onto the bed of the press. rIhe platen T is then forced down upon the half-tiask X by means of the can1- levers Z Z, bringing the half-dash, sand, and pattern into the position represented in Fig.

`In forcing down the halflask X upon the sand covering the pattern 'V, should there provo to be a surplus of sandin the formingbox, it will be forced out through the openings at the sides and ends of the base of the pattern. into the half-flask X, as above described, the levers Z Z are thrown into a vertical position, thereby relieving the platen'lfrom the pressure of the cams at the fulcrum ends of the levers and allowing the springs g y, attached to the under side of the bed, to raise the platen by means of the rods ZZ passing up through the tenons at the ends of the bed and bearing against the ,tenons at the extremities of the platen, as shown in Figs. land 2. The forming-box is drawn forward onto the arms y y immediately after elevating the platen, the front W of the box is lifted out of the grooves that retain it, and the pattern with the halflask X is carefully withdrawn from the box The pattern V is then removed from the half-flask and again placed in the forming'box, to be used again in the manner above described. The half-flasks formed by my improved method have gates formed in them, and pairs of them are confined together for casting pipes", in the usual manner; or the half-molds may be used for casting gutters or other concavo-convex articles.

I support the core and preserve itin the center of the mold by means of stays a, formed of narrow strips of thin sheet metal bent into the form represented in Fig. 8. The central portion of each of the strips of metal composing the` stays a are bent into a semicircular curve corresponding to the inner surface of themolds, and the ends of thestrips are bent inward and curvedto correspond with the pej riphery ofthe core.y A series of stays are placed in the lower portion of a mold at suitable distances from each other previous to vlocating the vcore within the same, and aV corresponding number of stays are placed uponthe core after it is located, directly above those laid in the mold, previous to placing the upper portion of the mold over thecore. The

series of stays thus combined with the core y,

and mold, it will be perceived, will preserve After forcing the lining molding-sand the core in the center of themold, however great their length may be.

In forming the staysa it makes no essential difference whether the extremities ofthe thin metallic strips of which they are composed be turned so as to forml the vinterior or exterior portion of the stays; or the thin metallic strips of which the stays are formed may be so bent as to bring their extremities to any other part of the stay; or their ends may be joined to each other, my object being to ,form a concave-convex skeleton stay the sides of which to bear against the sides of the core and mold, leaving ample space for the metal forming a pipe to tlow through between the sides of the stay.

By increasing the size of the staysso that they will iit into enlargements formed in the sides of the mold they will cause enlargements of the pipe at the points where they are 1ocated, which will add to the strength of the pipe.

My object in making use of more than two sections in the machinery for forming pipecores is to enable me to readily remove the cores from the sections without injury to the cores; and it will be apparent to all who are experienced in these matters that there may be considerable variation in the manner of constructing and operating the machine without deviating essentially from that herein represented and described. I do not, therefore, wish to be understood as intending to limit myself by the hereinafter-specified claims to the exact mechanical construction of the machinery for forming pipe-cores as herein described and represented, but shall .vary it as I may deem expedient, while I attain the same end by means substantially the same.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The improvement in the core-tube H, caused by severing it by a longitudinal slit, for the purpose herein set forth.

2. The manner of compressing a coating of 'sand upon my improved core-tube, or upon the whole of them arranged and operating substantially as herein described. e

3. In combination with the above-mem tioned core-boxsections or any other analogous core-forming sections, the slightly-elastic core-tube bearing-plates J J and caps f f, (or their equivalents) substantially in the manner and for the purpose herein set forth.

4. The manner of compressing the sand into a half-flask and giving it the impression of the pattern by placing the pattern at the base of a forming-box and covering it with sand, and then placing the half-hash upon the sand covering the pattern, and forcing it down upon the same by machinery, substantially as herein described.

5. The manner of preserving the cores in a central position within the molds by means of concavo-convex skeleton or open stays a, formed of thin narrow sheets of metal, and combined' with a core and mold, substantially in the manner herein represented and described.

CHAPMAN WARNER.

Vitnesses: Z. C. RoBBINs,

Tnos. EAMES.

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