US177395A - Improvement in molder s flasks - Google Patents

Description

T. F. HAMMER.

MO'LDERS FLASK.

Patented M.a. y16,1876'.

N-PERS, PMOTOLITHDGRAPMER, WASHINGTON. D. C.

. NITED STATEs THORVALD F. HAMMER, OF BRANFCRD, CONNECTICUT.

IMPROVEMENT IN MOLDERS FLASKS.

Specification forming part of Letters Patent No. l 77,395, dated May 16, 1.876 application filed March 25, 1876.

To all whom it may concern.-

Be itknown that I, THoRvALD F. HAMMER, of Branford, in the county of New Haven and State of Connecticut, have invented a new and useful Molders Plate for Banking the Sand ou Flasks for Molding-Machines, which invention is fully set forth in the following specification, reference being hadto the acbanked sand in the flask.

The object of my invention is to facilitate the process of molding, when molding-machines are used for pressing the sand in the flasks instead ofthe common way of ramming by hand. It is a common practice, after the ask is filled with sand, to strike it off even with the top of the ilask, then to use a pressi er-board, which lits neatly into the ilask, andthen, when the pressure is applied by the molding-machine, it forces the board down into the ask. In this process it is necessary to have the presser-board of a size and shape to eX- actly correspond with the inside of the flask used therewith, and if, as may often happen byrough and careless handling, the flask is in any forced out of its original shape, the pressure-board will not fit it, and therefore cannot be pressed down into it. To avoid any trouble of this kind, it is thought best to use a process by which the sand can be banked l up above the flask to such an extent that its pressure down even with the top of the ask, or nearlyso, -will produce the required oompaetness therein to forni the Inold, and by this process boards of any convenient size, as large or larger than the top of the flask, may be used.

In order to use my newly-invented flangeplate, I prefer to make my flasks in the usual way, with square edges, as seen at A A A, Fig. 2. The section of the flask itself is seen at Al A/ A A. The parting between -the half flasks is seen at E, Fig. 2.4 F represents the pattern, and G G Gr Gr the sand in the flask in Fig. 2. A cross-section of the flangeplate is also seen in Fig. 2, where B B shows the plate entirely covering the edges of the flask A A', thus completely preventing the sand from resting thereon. C C shows the bevel or incline flange of the saine with its lower edge extending down a short distance into the ask, as seen atl) D, Fig. 2, for the purpose of keeping it in its proper place on the ask. As said flange C C regulates the amount of the banking of the sand, which is, after being filled into the flask and ange, struck off with a straight edge even with its top, it must be of the proper height above the ask to insure the necessary compactness in the sand when it is forced down with the presser-board, even, or nearly so, with the top of the flask, after the flange-plate is removed therefrom, and the inclination or bevel of the said ange C C must be such that after it is filled with the sand and it struck off as above mentioned, and the flange-plate removed, that no part of the sand thus banked above the flask, will, while it is being forced down with the presserboard, be forced over or on the edges of the flask, as that would prevent the presser-board from coming down closely on the flask.

At H, Fig. 2, is seen what may be called the bottom board of the flask, as it is there located, but when the lower part of the flask as seen in Fig. 2, was being filled, and the side now shown down was up, with the llauge-plate on it as seen at BB, what is now shown as the bottom board H may have been used as the presser-board O of Fig. 3.

In Fig. l, in dotted lines, is seen atop view of the tlask'A A A A' resting on the bottorn board, a small margin of which is seen at H H H. At BB B B is seen the fiat o'r horizontal part of the flange-plate, and C C shows the bevel or inclined part of the same. At N N is shown the lugs for the steady-pinsv of the flasks to keep the two parts of the same together properly.

In using my invention l take one-half flask A A a'nd place it bottom, side, or edge upon a board, von which is placed the pattern to be Inolded, and I then place the flange-plate B B C C on the then upper edge of the half-flask A A', and fill them both up with sand above 'the top of the flange, and then strike it off se y 177.395

even with the top of' the same with a straightedge, then remove the flange-plate Bv C, and thus the sand will be left banked above the top of the flask A Al 'to an extent equal to the altitude of the flange C above the said ask. I then place the presser-board H on the banked sand, and apply a suicient pressure to the said board by means of a molding machine or otherivse, to force it: down closely, or nearly so, to the top of the ask A' A. I then turn the flask over, using the presserboard H as a bottom board, as seen in Fig. 2, and remove the board upon which the flask A and pattern have been resting, leaving the pattern in the sand, and dress up, if necessary, the parting E, and apply parting sand, using any method desired to form the gate or sprue. I then place the other half-flask on the one: now filled with sand, and on its top I place the flangeplate B @,and fill up With sand, and strike off the same as before; re-

C C, having projections DD, all substantially as and f 'or the purposes shown and described.

2. The `'ialrcgfe-plate B B C OD D, in combination with a molding-flask Withsquare or flat edges, as seen at A A, Fig. 2, all substan.l

tially as and for the purposes set forth.

THORVALD F. HAMMER.`

Witnesses: CEAS. H. FoWLER JN0.` S. CANNON.

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