US363138A - Core-guide for sand molds - Google Patents

Description

(No Model.)

C. HERMAN.

GORE GUIDE FOR SAND Moms.

'finire Srarns firmen@ ,armar CORE-GUIDE FOR SAND IVIOLDS.

SPECIFICATION forming part of Letters Patent No. 363,138, elated May 1 7| 1887.

Application filed March 18, 1887.

To all whom, it may concern:

Be it known that l, CHARLES HERMAN, of Allegheny City, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Core-Guides for Sand Molds; and I do hereby declare the following to be a full, clear, and exact description thereof.

Myinvention relates to the making and placing of cores in sand molds, its object being to provide simple means for inserting green-sand cores in molds-that is, inserting the cores in the molds without previously drying or baking, as is generally the custom with the sand cores.

In the manufacture of iron and other castings many different molds are formed which require cores therein, the cores being of different shapes, and it is generally foundnccessary to form them hard and sufficiently solid to handle easily; and to this end these cores have been necessarily baked before they were placed within the greensand molds.

Heretofore in two-part molds (that is, the molds in which one part of the mold-cavity is formed in the sand supported within one flask and the other part is formedy in the sand supported within another flask land the core placed in the mold-cavity in one mold and the other mold then placed thereon) means have been provided for placing `greensand cores, or cores which have just been molded and which are not baked ordried, within the molds. The most approved of such devices consisted of a core-box forming part of a plate, which plate had suitable guide-pins thereon which corresponded to the guidingsockets on the flask in which one part of the mold is formed. The core-box was made partible longitudinally, and one part formed with the plate and the other part 'formed removable therefrom, and the core was necessarily rammed horizontally as the plate rested on a suitable table or support, the upper part of the corebox being then removed, leaving the core resting in the other part of the core-box and the core extending above the plate. The half-mold previously formed was then guided down onto the core by means of the guide-pins on the plate of the core-box, the ask and coreboX plate then turned over, so that the core rested within the moldeavity, and the plate Serial No. 231,398. (NomodeLl having the core-box formed therewith wit-hdrawn, leaving the core within the mold-cavity, so that the other half of the mold could be placed thereon, forming the finished mold.A

This apparatus has certain objections, the pri ncipal being that` the core was necessarily rammed horizontally and that it was necessary to drop or lower the flask containing the half-mold onto the core, which in some cases caused the destruction of or injury to the m old, as the sand therein was not supported, except by the walls of' the flask, when the mold was lowered onto the core and was liable to drop out of the flask. The apparatus was also heavy and unwieldy, and required the inverting of the flask to place the core therein.

The object of my invention is to provide a simpler means for introducing the core into the Ahalf-mold; and it consists, essentially, in forming on the flask certain hinge portions and combining therewith a core-box having arms provided with hinge portions engaging with those on the flask, by means of which the coreboX, after the formation of' the core, can be secured to the flask and the core accurately guided into and placed within the mold-cavity of the half-mold.

It also consists in certain details of construe tion, as hereinafter set forth.

To enable othersy 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-box. Fig. 2 is a like view showing the core-box secured to the flask. Fig. 3 is a sectional view showing the manner of' introducing the core into the flask. lFigs. 4 and 5 represent the manner of withdrawing the core-box, and Fig. Gshews the core within. the finished mold.

Like letters of reference indicate like parts in each.

The flask a is of any ordinary construction, having thereon suitable dowel-pins and sockets, b, to guide the two parts of the flask together and hold the flask and pattern. in proper line during the formation ofthe moldo On one side of' the flask are formed the hinge portions e, which are of any construction suitable for engaging with thehinge portions d ou the arms e of the cerebex f, thehinge portions I on the ICQ arms being what are termed open hinges, so that they can be connected to the hinge portions c by passing transversely onto the pintles c thereof', the two lips d of each hinge portion d fitting the one on one side and the other on the other side of the pintle c of the hinge. By means of these hinge portions the core-box is brought in proper relative position to the flask so as to guide the core into the mold-cavity g formed within the sand ofthe ask. The coreboX j' is partible longitudinally, one half, f', thereof being connected by any suitable means to the other half, f2, thereof, and the half-box f2 being secured to the arms e. This core-box can bc removed from the flask and the core rammed or formed therein while the core-box is in a vertical position. The hinge portions on the flask and the guidearms, with their hinge portions, are placed in proper position and made of proper length to guide thc core accurately into the mold-cavity, so that when the parts are raised to enter the core into the 1noldcavity these arms and hinges act to direct it accurately into its seat. After the formation of the core the hinge portions d are caused to engage with the hinge portion c on the flask, and the upper half, f,'of the core-box is then removed, leaving the upper half of the core exposed, thevcore resting in the lower half, j", of the core-box, as shown in Fig. 2. In order, now, to insert the core within the mold-cavity g, as the core would naturally drop out of the core-box if it were turned over above the flask, and as it is not desirable to turn the flask over upon the core-box, since the mold might bc injured thereby, the flask and the core-box are raised together, the flask being canted on one side edge thereof and the core directed bythe hinge-connections and the arms, so as to guide the core properly into the moldcavity g. After which, as soon. as the core is guided into place, the flask may be lowered, the core-box resting upon the core while it rests within the mold-cavity.

` In case the core formed is cylindrical, the

core-box may then be removed by simply drawing it back on its hingeconnections, as it will then clear itself of the core; but where the core formed is angular this could not of course be done; and in order to remove the core-box it must be lifted vertically from the mold, its vertical'movement being directed by the lips d of the hinged portions d, which hold it in proper relative position to thel core and mold until it is removed therefrom. These hinge portions and their connections with thev core-box thus act to guide the core into the mold-cavity, as well as to guide the operator in removing the core-box, whether itis drawn off by a swinging movement, with the hingeconnection as a center, or lifted vertically therefrom.

rllhe device is simple in construction and can be applied at a small `expense to lany molds, and by its use these green-sand cores can be formed more rapidly, as they can be molded when in a vertical position, and the cores can be in serted with greater facility than with the devices heretofore in use.

ThatI claim as my invent-ion, and desire to secure by Letters Patent, is

1. In sand molding apparatus, the combination, with the fiask, of a core-box provided with guide-arms and suitable hinge-connections between said guide arms and fiask, whereby the core formed can be directed into the seatof the mold-cavity, substantially as and for the purposes set forth.

2. ln sand'molding apparatus, the combination, with the flask having the hinge portions thereon, of the core-box provided with guidearms having open hinge portions,substantially as and for the purposes set forth.

` ln testimony whereof l', the said CHARLES HERMAN, have hereunto set my hand.

GHAS. HERMAN.

Witnesses:

N. S. STooKWnLL,. J. NEGLEY COOKE.

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