US560433A - Founder s molding-machine - Google Patents

Description

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SSheets-Sheet 1. P. J. $OOTT. FOUNDERS MOLDING MACHINE. No. 560,433. Patented May 19, 1896.

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FOUND-HE'S MOLDING MAGHINE. No. 560,433. Patented May 19, 1896.

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No. 560,433. Patented Ma i19, 1896 M1 f nesse:

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MfiHUTO- U QWASHINGTUNDC UNITED STATES PATENT OFFICE.

FRANK J. SCOTT, OF ST. PAUL, MINNESOTA.

FOUNDERS MOLDING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 560,433, dated May 19, 1896. A li ation fil d September 10,1894. Serial No. 522,576. (N0 model.)

T0 at whom it may concern.-

Be it known that I, FRANK J. SCOTT, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Founders Molding-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i 1 v Myinvention relates to founders molding machines, and has for its object to provide an efficient and simple machine of this class.

To these ends my invention consists in the novel features of construction hereinafter fully described, and defined in the claims.

My machine is illustrated in the accompanying drawings, wherein, like letters referring to like parts Figure 1 is a plan View of the machine with some parts of the pattern broken away. Fig. 2 is a vertical section of the same on the line X X of Fig. 1, and Fig. 3 is a horizontal section on the line X X of Fig. 2.

a represents the base-plate, and a the vertical walls or shell, of a suitable frame for the operative parts of the machine. The baseplate axis of skeleton-like form or is otherwise provided with openings for the outward passage of the sand. The vertical walls a are also provided with openings a for access to the interior of the shell. To the top of the said frame is secured the outside section of a divided or multipart stripper-plate b b. The inside or stool section b of this stripper-plate is supported from the frame-base by stool-rods stripper-plate extends outward beyond the shell a and is provided, as shown,with dowels b for receiving and holding one of the flasksections 0, which, as shown, is intended as the drag or nowel.

The machine, as shown, was'designed for casting the main gear of a mower. Hence the multipart pattern shown is suitable for producing the said casting, and comprises the central or hub section d, which is made to closely fit and is movable through the stripperplate in the central passage 11 thereof, an external or rim section d with teeth d which closely fits and works through the stripperplate passage C1 and radial or spoke portions (Z which are formed on the face of the stoolsection b of the stripper-plate. The stool-section of the stripper-plate is of course provided with teeth bfiwhich work in the teeth of the rim-section d of the pattern. The central pattern-piece dis carried on the upper end or reduced shoulder f of a central plunger f,

the lower end of which works in a sleeve-likeguide f, fixed to the base-plate a by bolts f or in any other suitable way. The patternpiece cl,fitting the central passage b in the stripper-plate, as hitherto noted, causes the stripper-plate to form a guide for the upper end of the plunger and the said central pattern-piece d. The pattern-piece d d or rim of the gear is carried by a series of three sets of toggle-levers, the central pivots of which are indicated at g. These toggles are in circular arrangement with respect to each other, are equally spaced, .and their central or pivotal points move radially. The upper arms g of these toggle-levers are pivotally connected to lugs g projecting from the patternsection d C1 The lower arms 9 of the said toggles are pivotally connected to bearinglugs 9 fixed to the base-plate a. The upper toggle-arms g are eachcomposed of two sections 9 g, having screw-threaded engagement, with right and left threads, with an adjusting-nut g which is held where set by jam-nuts 9 This construction permits the upper arms 9 of the toggles to be varied in length, so as to hold and carry the patternsection (1 d at the proper levels. The lower arms g of the said toggles are enlaged or expanded radially, and have in their expanded portions cam-slots g".

To the central plunger f is fixed a threearmed spider h h, the hub portion h of which engages a shoulder f on the plunger f. The

ends lateral projections, preferably in the form of rollers 7L2, which engage with the camslots g in the toggle-arms 9 A rock-shaft 7c is mounted in bearing-lugs fixed to the base-plate a or sleeve f, and extends outward at one end beyond the frame of the machine. To the. projecting part of said rock-shaft 7c is fixed a hand-lever I122. The said shaft 70 is provided with a central crank-arm which is connected by a link k to the spider-head h, which, as already noted, is fixed to the plunger f. The hand-lever k is so applied to the rock-shaft it that when the parts are in the position shown in the drawings the said lever will stand to the right of its vertical position and all the parts operated thereby will be in their highest position. Hence when the lever is thrown toward the left the crank-arm k 011 the shaft 70 will be turned downward, and all the parts operated thereby will be pulled downward therewith. The upward movement of the parts is limited by the crank-arm it coming in contact with the sleeve f, and the downward movement of the crank-arm k and the parts operated thereby is limited by the spider-head h coming in contact with the top of the guide-sleeve f. This guide-sleeve f is made of the desired height to limit the downward stroke of the plunger f for the de sired length of draw to be given to the central or hub section 01 of the pattern. The cam-slot g in the toggle-arms g is made of the desired angle and shape for cooperation with the cam-lever spider-arms h to give the desired amount of movement to the rim or pattern section d (1* under the movement of the plunger f. As shown, these parts are arranged for a diiferential movement of the pattern-piece d and the pattern-piece dd Otherwise stated, the hub-section cl of the pattern is drawn a greater distance than the rim-section cl (1 The relation of the camslots 9 and spider-arms h may be such as to make this differential movement more or less, according to the requirements of the case.

Having regard further to the operation of the machine, the parts as shown in Fig. 2 are in position to receive the sand into the flask c. \Vhen the sand has been properly set, by ramming, &c., in the usual manner, the movable pattern-pieces d d are drawn down through the stripper-plate by simply throwing the hand-lever 70 over into its lefthand position. The drag c or other flasksection may then be removed from the machine, and the mold-cavity will be properly formed in so far as required to be made in the drag. The dowels I) would insure the proper movement of the drag for drawing the shallow portions (1 of the pattern, which are formed on the face of the stripper-plate. Inasmuch as the movable pattern-sections cl and d are held by the cooperating guidingsurfaces of the stripper-plate sections Z) I), with the teeth 19 of the stripper-plate working in the teeth d of the rim (1, it is of course obvious that the said pattern-sections must be drawn on absolutely true lines.

From the foregoing it is obvious that an ordinary unskilled laborer can operate this machine. Better results can also be seen red, or be more reliably secured, at every action than by the most expert molders. Even the most expert molder cannot always effect the draw on exactly the same true lines. The machine will also do more work than an eX- pert molder. In a considerable experience I have found that these machines will effect an average saving of over twelve dollars per day for the same workas compared with handmolding. Otherwise stated, I have found by my experience that in a large foundry, such as is used in the manufacture of harvesters, molding machines such as I have herein shown will, considering the whole range of large and small pieces, effect an average saving of about fifty per cent. over han d-molding. The first cost of the machines is just about equal to what it would otherwise cost to provide the necessary number of duplicate patterns if hand molding was employed for the same work.

It will of course be understood that a suitable companion machine would be provided for producing the cooperating part of the mold-cavity in the other section or cope of the flask; but for the purposes of this case it has not been deemed necessary to show the companion machine.

It will of course be understood that the parts of the stripper-plate and of the pattern and the relations of the carriers to such of the said parts as may be movable, for effecting the draw, will be changed in practice, as required, for adapting the machine to the different kinds of castings intended to be produced. The principle of a multipart pattern or several distinct pattern-pieces, which cooperate to produce a single integral casting, the principle of the diiferential draw or clifferent pattern-pieces, the principle of some parts of the pattern being formed 011 the stripper-plate, the principle of the toggle-levers for carrying the parts requiring movement in order to effect the draw, and the principle of the cam-lever connections from the toggles to the plunger would or could remain the same, while permitting a large di-- versityin the details of the construction and in the arrangement of the different parts. Any and all of such changes would be within the scope of my invention, as I herein intend to claim the same.

\Vhat I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. Inafounders molding-machine the combination with a series of toggle-levers, carrying a pattern-piece, of a central plunger carrying a spider with radial arms, and camslots in said toggles engaged by said arms, whereby said pattern may be drawn by said toggles, under the movement of said plunger, substantially as described.

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2. In a founders molding-machine the combination with a multipart pattern, of a central plunger, carrying one of the patternpieces, a series of toggle-levers carrying another pattern-piece, a spider with cam-lever arms fixed to said plunger, and cam-slots in said toggles engaged by said arms, with the parts arranged to eifect the movement of said parts from a common source, substantially as described.

In a founders molding-machine,the combination with a multipart pattern, of a central plunger carrying one of the patternpieces, a series of toggle-levers carrying another pattern-piece, a spider with cam-lever arms fixed to said plunger, and cam-slots in said toggles engaged by said arms, with the parts arranged to effect a difierential movement of the plunger and the toggles, substantially as described.

4. In a founders molding-machinathe combination with the pattern and parts movable therewith, of a series of toggle-levers carryin g the same, one arm of each of which toggles is provided with means for longitudinally extending it, and connections to said toggle for actuating the same, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK J. SCOTT. lVitnesses:

J AS. F. WILLIAMSON, FRANK D. MERCHANT.

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