US703034A - Molding apparatus. - Google Patents

Description

No. 783,034. Patented June 24, I902.

w. c. WRIGHT. MOLDING APPARATUS.-

(Application filed. Oct. 17, 1901.) (No mam.)

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' UNITED STATES PATENT OFFICE.

\VILLIAM C. \VRIGHT, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER COMPANY, OF PORTLAND, MAINE, AND HOPEDALE, MAS- SAOHUSETTS.

MOLDING APPARATUS.

SPECIFICATION forming part of Letters Patent N 0. 703,034, dated June 24, 1902.

Application filed October 17,1901. Serial No. 78,989. (No model.)

To aZZ whom, it may concern:

Be it known that 1, WILLIAM C. WRIGHT, a citizen of the United States, residing at Hopedale, county of W'orcester, State of Massachusetts, have invented an Improvement in Molding Apparatus, of which the following description, in connection with the accompanying drawings, is a specification, like charac ters on the drawings representing like parts.

In that class of molding wherein the parting face of the mold is obtained by the use of a match which is mounted in and supported by a suitable frame it is now common practice to secure the pattern provided with a proper gate to a frame which rests upon the top of the match-frame during the construction of the drag, the pattern and gate at such time being supposed to rest firmly and truly in the corresponding depressions in the face of the match. Frequently the match and pattern do not contact equally, as they should, and some portion or portions of the pattern will not bottom on the match, so that when the sand is rammed into the drag-flask the unsupported part of the pattern will yield and the completed drag will be imperfect by reason of such distortion of the pattern, The cope will also be affected by such distortion, so that the casting subsequently made from the mold will be imperfect, and when the pattern is drawn it will damage the mold,because the pattern has not in the first instance been accurately and equally supported throughout by the match, and such damage must be repaired by careful handwork or a new mold must be made. Inasmuch as the frame connected with the pattern rests upon the top of the match-frame, it will be manifest that any sand, grit, or other foreign matter between the adjacent faces of the two frames will operate to prevent the true and fair bottoming of therpattern on the match, witl1 the results before mentioned. Sometimes the ramming of the drag is not uniform throughout, so that the sand in some portions thereof will be harder than in other portions, and when the cope is rammed the part of the pattern above the less compact portions of the drag will yield relatively to the other part of the pattern,

causing the production of a distorted mold. It will be manifest that this result must follow because the pattern cannot settle as a whole, owing to its rigid connection with the supporting-frame which rests on the dragfiask when the cope is constructed. These and other practical objections to thisclass of machine-molding have caused great annoyance, expense, and expenditure of time in correcting the resulting faulty molds, and the imperfections of the apparatus and its mode of operation have given rise to great dissatisfaction therewith.

My present invention relates to molding apparatus employed in the general class of Work hereinbefore referred to; and it has for its object the production of novel and improved molding apparatus whereby the objectionable features referred to are entirely obviated, the apparatus embodying my invention being also thoroughly adapted for the production of rapid and accurate work without the use of highly-skilled labor.

The various novel features of my invention will be hereinafter described'in the specification, and particularly pointed out in'the following claims.

Figure 1 is a plan View and shows a match sustaining a pattern provided with a vibrator extension and with guides on the latter in accordance with one embodiment of my invention. Fig. 2 is a plan View of the pattern and its attached parts removed from the match. Fig. 3 is a longitudinal sectional view on the line 3 3, Fig. 1, but also showing in vertical section a portion of the drag-flask. Fig. 4 is an end elevation of the superposed cope and drag flasks with the pattern in position, the vibrator extension being cut off outside of the flasks to more clearly show certain devices thereon to be hereinafter described; and Fig. 5 is a vertical sectional detail on the line 5 5, Fig. 4.

In the specification and claims I shall use the term drag to designate the sand mold made in the drag-flask and the term cope to designate the other part of the mold made in the cope-flask.

The match A,composed of any suitable material and having in its upper face the configuration corresponding to the pattern cooperating therewith, is contained in a suitable frame comprising a bottom board Band upright sides B, the match and its frame being of usual construction with the exception that in accordance with my invention the opposite ends of the match are cut away or recessed to leave clearance-spaces b for a purpose to be described, said clearance-spaces being clearly shown in Fig. 1.

The pattern P of any configuration is shown as provided with a gate g,and this gate,herein illustrated as an elongated rigid bar, preferably of metal, has attached thereto, preferably at both ends, what I have termed vibrator extensions E, said extensions being shown as shaped to constitute handles and detachably connected with the gate by suitable means, as screws 5, the inner end of each loop-like extension E having a cross-piece 6 provided with a foot 6', which, as shown in Fig. 3, is adapted to enter a suitable seat 9, formed in the gate.

Referring to Figs. 1 and 3, wherein the pattern is shown in position on the match ready for the construction of the drag, it will be noted that the sides of the loop-like extensions pass through the clearances b of the match-frame and do not contact in any way with the latter, so that the pattern, its gate, and the extensions E are supported wholly by the match, and if the pattern and the match correspond throug'hout,as they should, lhe former will be accurately and truly seated on the match throughout all its parts, and when the sand is rammed into the drag-flask D there can be no distortion of the pattern or any part thereof, because it is uniformly supported at all points by the match.

The vibrator extensions are upturned between the inner and outer ends thereof, as at e so that the parts which project beyond the match-frame and also beyond the flasks during the construction of the mold are elevated above the general plane of the face of the match, as clearly shown in Fig. 3, and each loop-like extension E is herein shown as provided on its under face with parallel ribs 6 to constitute a guideway for a substantially F-shape guide 6, the depending portion of each guide having a bevel-sided recess 6 while the top or head of the guide is longitudinally slotted, as at e, to receive the shank of a set-screw e which is screwed into the extension. These guides are adapted to receive the drag-pins d secured exteriorly to the ends of the drag-flask D, (see Figs. 3, 4c, and 5,) so that when the latter is in position for the construction of the drag the said dragpins will cooperate with the guides 6 and also with guides a adjustably attached to supporting-plates a secured to the match-frame.

When the molder has rammed the sand in the drag-flask and has completed the drag, the latter, with the match, is turned upside down in usual manner and the match is lifted off, leaving the pattern and its attached partsnamely, the gate and extensions-in position on the drag and vertically supported wholly by the sand constituting the drag. For this purpose the ends of the drag-flask are cut away or recessed to form clearances d, as best shown in Fig. 4, and similarly the cope-flask G is provided in its ends with clearances 0, so that when the two flasks are superposed, as in Figs. 4 and 5, the loop-like ex tensions E will receive no vertical support whatever from the drag-flask, nor can any vertical pressure be exerted thereupon by or through the cope-flask. After the match has been lifted off, as hereinbefore referred to, the cope-flask is put in position on the dragflask and the drag-pins d cooperate with the cope-guides 0*, herein shown as adjustably supported on plates or cars 0 rigidly attached to the cope-flask. Heretofore in this class of molding apparatus, wherein the pattern has been rigidly attached to a surrounding frame, the latter has had rigidly secured to it guides to cooperate with the drag and cope flasks, and when the fit has become faulty by reason of wear it has been an exceedingly diflicult and troublesome matter to correct the same.

In my present invention by making the guides 6 adjustable any looseness due to wear or otherwise can be quickly and readily compensated for by adjusting the guides on the extensions E by means of the set-screws 6 This adjustment when necessary is preferably effected after the match has been removed from the drag, the molder at such time loosening the set-screws e and setting up the guides against the drag-pins to snugly engage the same, after which the guides are secured in such adjusted position by tightening up the set-screws. Manifestly the pattern will thereby be accurately positioned relatively to the drag, and when the cope-flask is applied it will also be positioned relatively to both the drag and the pattern.

WVhen the sand is rammed in the cope-flask, it being remembered that the pattern is vertically supported wholly by the drag and independent of the drag-flask, it will be manifest that should any part of the sand forming the drag be less compact than other parts the pattern will tend to sink in the less compact part, but the pattern will sink as a whole, and thereby the bending or displacement of one part of the pattern relatively to another is obviated, and while the part of the pattern in the drag may be slightly displaced it will be displaced as a whole, and/the completion of the cope will compensate for such displacement, and the completed mold will be perfect and will produce a perfect casting. The cope having been completed,it is usual in machinemolding to vibrate the pattern while the cope is being lifted and also when the pattern is drawn, and for this purpose any suitable vibrator, as V, may be connected with one of the vibrator extensions E, one well-known form of vibrator comprisinga piston rapidly reciprocated in a suitable cylinder by comrolof a vibrator extension connected with the pattern and which is exterior to the flasks the vibration can be readily imparted to the pattern. I

I believe it to be broadly new in machinemolding apparatus to sustain the pattern wholly by the drag independently of the dragiiask during the construction of the cope.

From the foregoing description, taken in connection with the drawings, it will be manifest that if the pattern is true and the match is in proper condition it will be impossible to distort or bend any part of the pattern or the gate during the formation of the drag, because the pattern is supported wholly by the match at such time, and all parts of the pattern will be fairly and truly bottomed.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In molding apparatus, a match and its frame, the latter having a recessed portion, a pattern provided witha gate and a vibrator extension on the latter, the pattern, gate, and vibrator extension being supported wholly by the match independently of the match-frame during the construction of the drag, the vibrator extension passing through the recessed portion of the frame and out of contact with the latter.

2. In molding apparatus, a match and its frame, the latter having recessed portions, a cooperatin g pattern, and oppositely-extended vibrator extensions connected with thepattern and constructed as handles, said vibra tor extensions passing through the recessed portions of the frame out of contact with the latter.

3. In molding apparatus, a pattern and its gate, extensions on the opposite ends of the latter, projecting beyond the flasks during the construction of the mold, and drag and cope flasks having external means thereon to cooperate with said extensions to position the pattern and flasks, the latter having clearance portions to receive said extenstions, whereby the pattern, gate, and extensions, will be supported wholly by the drag during the construction of the cope.

4. In molding apparatus, a drag, and its flask, a pattern sustained wholly by the drag independently of its flask during the construction of the cope, and adapted to be engaged exterior to the drag and cope flasks to be vibrated preparatory to separation of the cope and drag and withdrawal of the pattern.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

l/VILLIAM C. WRIGHT.

Witnesses:

LINCOLN WRIGHT, GEORGE B. ARNOLD.

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