US966762A - Molding apparatus. - Google Patents

Description

o.y P. PAEHLKB.

MOLDING APPARATUS.

APPLIUATION FILED DBO.3,1909.

966,762. Patented Aug. 9,1910.

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O. P. PABHLKB.

MOLDING APPARATUS. APPLIGATION FILED Dno.3,19o9.

966,762. Patented Aug.9,191o;

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OTTO F. PAEHLKE, OF CLEVELAND, OI-IIO.`

MOLDING APPARATUS.

ySpecification of Letters Patent. Patented Aug'. 9, 1910.

Application filed December 3, 1909. Serial No. 531,168.

To all whom it may concern:

Be it known that I, OTTO F. PAEr-ILKE, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Molding A paratus, of which the following is a speci l cation.

My invention relates to improvements in molding apparatus, and the improvement consists in the combination of parts, substantially as herein shown and described and more particularly pointed out in the claims.

My object is to take conditions in the foundry as I find them and furnish the melder with a device wherewith he can do better work and save time and labor on each and every job regardless of the run of the days work. By this last I mean that patterns of all kinds and shapes and sizes may be handled as they come and that only one mold, or many, may be made from a single pattern with economy and despatch and without special preparation. To this end, I provide a set of devices adapted to be detachably and adj ustably secured to molders patterns to eoperate with the ordinary melders flasks in general use, and wherewith the pattern may be steadied and guided when withdrawn from the mold to prevent distortion or breaking down of the mold.

In the accompanying drawings, Figure l is a sectional view of a flask and mold and pattern substantially completed and as it appears before the cope is lifted and removed, and Fig. 2 is a similar view of the same parts without t-he cope. Fig. 3 is a sectional view of the lower half of the flask and mold with my improved steady-pins attached to the pattern and in position to guide the pattern for removal, the dotted lines showing the pattern in raised position. Fig. 4 is a sectional view of the flask and lnold complete without the pattern and ready for casting operations. Fig. 5 is a perspective view of the lower half of the flask and mold with the pattern therein and showing my improved devices operatively connected therewith. Figs. 6, 7 and 8 are perspective views of one form of steady-pin, thumb screws and screw plate, respectively, as sold to the trade.

As shown, my invention comprises two or more right angledmembers A, which may properly be referred to as steady-pins in view of their function and purpose. Each member consists of a flat arm 2 having a longitudinal slot 3 at one end and an integral stem 4: at right angles at its other end. Stem l is round, triangular, square or of any suitable cross section and relatively of less length than arm 2. However, as to the length of these parts no particular limitation is intended, but for general use a length of twelve inches for arm 2 and ten inches for stem t is suilicient to meet the average requirements in a foundry. When in use, arms 2 overlap the top end edges of the lower half or so-called drag 5 of the flask B and rest flush upon or freely above the mold C and pattern D when the upper half or so called cope of the flask is removed. Stem et is placed at the outside of the flask and projects through or is slidably confined within open lugs or keepers 7, such as are always found at the ends of one part of flask B. Keepers 7 also cosact with and slidably hold the fixed pins 8 on the other part of the flask to keep these parts in matching relation during the making of the mold and during casting operations thereafter and they also serve to steady the cope or upper flask part when removed and replaced. Now, every foundry, especially where floor work is done, has a large assortment of flasks of various dimensions to meet varying needs in making molds, and in practice no larger flask is used than any given pattern on mold requires. This invariably brings the tern close to the edge of the flask, especially at opposite ends thereof, whether the job be large or small, and permits the use of my steady-pins A with the lugs 7 of any flask of ordinary construction and without change in either the flask or pattern. However, a plate or set of plates 9 are preferably supplied which may be fastened upon, or inset into the pattern, or upon its rapping board, by screws l0 or otherwise, and this fastening may be temporary or permanent and be placed where most convenient for attaching Steady-pins A. To thislatter end, each plate 9 is provided with a screw hole l1 to receive a thumb screw 12 which is of a size patto lthrough slot 3 of arm 2. By slotting said arm, no great care need be exercised in placing plates 9`upon the pattern, as all va-A riation in distance and alinement between the pattern and the end of the flask may be adjustably taken up by. the accommodation afforded to thumb-screws 12 within said slot. Again, after tamping of the cope part of the mold and when the level of the pattern may have lowered somewhat in respect to the original parting line as often occurs, I can introduce metal washers W of any suitable thickness between arms l and plate 9 to make a rigid attachment for steady-pins A. This adaptation of the device brings out an important point of difference between my invention and all other molding apparatus or attachments known to me, to wit,-that with my device a melder is enabled to attach and detach the same from the pattern without altering the flask or the mold and without having said device take any part or place in the making of the mold until the pattern is to be withdrawn. Thus my steady-pins for the pattern are not subjected to tamping operations during the making of the mold, nor are they embedded in the mold or in the top edges of the flask, but are absolutely free therefrom, and therefore may be attached and detached without danger of distorting or breaking down the mold and causing the need of after building up or repairs thereon.

In practice, my steady-pins are attached after the mold has been completely tamped in both cope and drag and after the cope has been removed. They do not form supports for the pattern during tamping operations as this is objectionable for the reason that when the cope is tamped there is always great liability of the pattern and mold in the drag to settle and if the attachments A were in place at this time, a slight spring or yield would result which would distort or enlarge the mold. A spring or shift in the patterndue to tamping, causes the mold to break down or crumble here or there, or if this does not actually occur, a change or distortion would still be the result to the detriment of the mold and the final casting.

I avoid all the foregoing objections by construeting my improved attachment as hereinbefore described and by using the same as follows: Following usual practices and well known methods I first build up the mold to the form shown in Fig. 1, wherein the cope or upper half of flask B is ready for removal from the lower half. The cope being removed, the next step is to withdraw the pattern, always a delicate task, especially when the mold is of large size and because the usual practice is to place the more difficult work in the drag. Therefore great care and skill must be required in this operation, otherwise the mold will be distorted, changed, or broken down, thus occasioning loss of time and exacting laborE to repair the mold. To meet the emergency, I now place my steady-pins A inthe' open lugs or keeper 7 on the lower flask, and firmly fasten arms 4 to the pattern by thumb screws 12, using washers W between screw plates 9 and arms l if the pattern has settled during previous tamping operations. This being done, steady-pins A may now be regarded as fixed and rigid parts of the pattern. Screw eyes 15 are also usually screwed into the pattern at this time to lift the pattern from the mold, and in a large pattern four screw eyes are used, two at each end. The pattern is now raised slowly and carefully, rapping of the pattern proceeding also as usual. Steady-pins A now guide and hold the pattern to a fixed vertical travel and prevent accidental shifting of the pattern and obviously greatly facilitate the making of a perfect mold. Vhen the pattern is finally withdrawn and laid aside, the cope is replaced, other foundry practices perhaps being performed in the n'leantime. The steady-pins A are now detached, and the pattern again used for :mother lnold if desired, but in no event do steady-pins A remain on the pattern during any part of the molding operations except for the brief interval when the pattern is withdrawn.

Fig. G represents a slight modification of the steady pin member and particularly in the portion indicated by t', which is substantially V shape in cross section.

What I claim is:

1. A molders flask having lugs at its ends, and a pattern, in combination with a set of steady-pins comprising right angled members having adjustable and detachable connections with said pattern and having stem portions to slidably engage said lugs.

2. A divided flask having pins and keepers therefor on its respective parts, and a pattern, in combination with right angled members having adjustable and detachable fastening connections for said pattern and having projecting stems adapted to slidably cngage within said keepers.

8. A molders flask having steady-pin lugs thereon, and a pattern having detachable plates, in combination with right angled steady-pin members having detachable fastening connections for said plates and pattern and constructed with stems to sldably engage said flask lugs.

4f. A molders flask having steady-pin lugs thereon, and a pattern having fastening plates for steady-pins, in combination with a set of steady-pins having slotted arms and right angled stems, and thumb screws to fasten said steady-pins to said plates and pattern.

5. As an article of manufacture and sale, an attachable and detachable device for safeguarding molds during withdrawal of pateeefree Q terne. cnprsng a right angled member, to detachably fasten said. slotted arms' rg an attachable pattern plate, and a clamping idly to the pattern. 10 device for said member and plate. In testimony whereof I aHiX my signature 6. An attachable and detachable device n presence of two Witnesses.

for safeguarding molds during Withdrawal OTTO F. PAEHLKE.

of patterns, comprising steady-pin :members Witnesses: having sletted arms and fixed stems at right F. C. MUSSUN, angles thereto, combined with thumbserevvs E. M. FISHER.

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