US1370550A - Mold - Google Patents

Description

W. Cl NORCROSS.

MOLD.

APPLICATION FILED JUNE 19, H919.

Patented Mar. 8, 1921,

3 SHEETS-SHEET I.

W. C. NORCROSS.

MOLD.

APPLICATION FILEID JUNEJQ, 1919.

Patented Mar. 8, 1921 3 SHEETSSHEET a;

fl -How" e1 UNITED STATES WILLIAM C. NORCROSS, OF TERRE HAUTE, INDIANA.

MOLD.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed June 19, 1919. Serial No. 305,382.

T 0 all whom it may concern:

Be it known that I, WILLIAM C. NoRoRoss, a citizen of the United States, residing at Terre Haute, in the county of Vigo and State of Indiana, have invented certain new and useful Improvements in Molds, of which the following is a specification.

This invention relates to molds and, more particularly, to. those which are used for casting car wheels.

It is a common practice to jolt or ram molds, including those used for casting carwheels, on a jolting or jolt-ramming machine to cause the sand to properly pack about the pattern. Various jolting machines, including those which I have invented, have been employed in jolting or ramming molds.

In jolting copes for car wheels, it is desirable to clamp the chill firmly to the pattern and, also, to securely bolt the cope to the chill. If any play exists between the pattern and the other parts while the jolting is being carried on, the sand in the mold sloughs off the bars and consequently the rammed mold cannot be lifted clean from the pattern. Similarly, in the drag, the pattern cannot be lifted clean from the mold. In olting or forming copes, as the mold is lifted from the pattern, the sand must all lift clear from the face of the pattern, otherwise the mold is imperfect and cannot be used.

The present invention has for its object the provision, first, of a car wheel pattern of novel construction and combined with the chill in an improved manner; second, means, for instance coil springs, combined with the pattern and chill in a novel-manner, which insure a parallel disposition of the chill and mold while being lifted from the pattern in the cope half of the mold, and, parallel arrangement to the pattern when it is drawn from the drag half of the mold, whereby any tendency toward pinching off of the mold is entirely obviated and clean drawing is insured; third, means for locking the chill and pattern together in the cope half of the mold; fourth, means for locking the pattern and drag together in the drag half of the mold; fifth, other features and novel combinations tending to accomplish the object of the invention as set forth more fully hereinafter.

The various objects of the invention, as

above specified and which appear more fully hereinafter, are accomplished by the constructions, combinations and relationships of the parts as set forth in detail in the following description. One form the invention may assume is disclosed in the accompanying drawings as illustrative thereof and of the principle of the invention. I wish it understood, however, that I do not limit myself to the particular spring means shown and described, nor to the precise manner in which the spring means are carried by the pattern, nor to the particular keys used for clamping, nor to the use of my improvements and improved combinations in connection with a mold for car Wheels, as modifications may be resorted to and the improvements may be embodied in molds employed for the casting of objects and articles other than car wheels.

In the accompanying drawings Figure l is a detail vertical section through one-half of a cope, chill and pattern disclosing my improvements the pattern being located on a jolting tab c.

Fig. 2 is a plan view of a complete cope half of a mold such as shown in Fig. 1, and

Fig. 3 is a detail vertical section of a portion of the drag half of the mold provided with my improvements.

A portion of the jolting table of the joltramming machine is, shown at 1, a portion of my improved pattern appears at 2; the chill is shown at 3 and the cope flask at 4. A suitable frame or ring 5 is placed' on the cope flask 4 to hold the surplus sand, such as will be sufficient to properly fill the cope flask 4 between the bars of the same when the mold has been completely jolted or rammed.

I have illustrated the invention as adapted for forming molds for car wheels but it may be embodied in any mold.

The pattern 2 has a flange 6 which is provided with a plurality of bearings or cars 7, three being shown. Each ear has a socket 8 in which the spring means I employ is seated. I have shown coil springs 9 seated in the ears or lugs 7 and contained within and fitting the sockets 8. An opening 10 is provided in the bottom of the ear through which any loose sand may fall. The spring 9 being open, such sand as may reach the springs and the sockets can readily fall through.

The lugs or ears 7 are spaced slightly from the edge of the jolting table 1. to provide a clearance space 11. The springs 9 are of substantially the same tension so that they will equally expand and contract. These springs are of such length and tension that when the chill 3 and cope flask i are liii'ted,

as hereinafter described, the springs will ert a substantially even pressure upwardly on the bottom of the chill. and follow the chill upwardly, so to speak, until thechill and flask have, arisen suiliciently to. minimize any danger of pinching oil oil the mold at those points where pinching off is liable to occur if the chill and cope are not substantially parallel as-they rise. When form'ng. a mold for a car wheel, the point where pinching oil of the sand is liable to occur is designated 12. As the chill S, which surrounds the pattern 2, rests upon the springs 9 at a plurality of points, the expansion of the springs, when the chill and cope flask are lifted, tends to keep all parts of the chill parallel with the pattern.

The chill 3 is provided with a plurality of laterallyextending lugs 13 each having a hole 14. The'pattern 2 is provided with corresponding lugs 15 each having a hole 16.

Removable headed, inverted, pins 17 pass through the holes 14: and 16 and are securedby keys 18 passing through slots'19. The keys may be driven in tightly and consequently the chill 3 is firmly clamped down on the flange 6 of the pattern, the springs 9 being held under compression by this action and consequently are ready to expand when the chill and cope flask are lifted.

The cope flask 4 and chill 3 are. provided with lugs 20 and 21, respectively, which are bolted together at 22.

The core print-is shown at 23 core appears at24. The runner gate'25 is set over the print 23 and core 24. The gate core 24 is carried by the surrounding green sand, p

Referring nowto Fig. 3, which illustrates the drag half of a car wheel mold embodying" my improvements, the drag flask is shown at 26 and sets down directly upon the flange 6 of the pattern 2 and rests upon the upper ends ofjthe springs 9 which are seated in sockets 8 of lugs or ears 7 as explained in connection with the cope hall oi the mold and pattern. The pattern 2 has lugs 27 and the drag 26 has lugs 28 at different points which have apertures 29 and 30, respectively,

. through which pass the respective clamping pins 31 which are slotted at 32 and in whose slots are. received the keys 33, whereby the drag is firmly clamped down onto the pattern 2 just as the chill 3 is clamped down on the pattern 2015 the cope half of the mold,-

as shown in Figs. 1 and 2. 7

Referring first to Figs. 1 and 2, the operator, by means of an air or other suitable and the gate hoist, first picks up the chill 3 and cope flask which have been bolted together. The trunnions 3%. on the chil 3 afford a convenient means for attachment to the-hoist. Having placed the chill on the flange 6 of the pattern, the gate core as is placed around the core print 23 and the runner gate 25 is then set over the print and core. The flask pins 17 having been entered through the holes, the keys 18 are driven through the slots 19, thereby firmly clamping the chill to the pattern, the springs 9 being under conjipression; Sand is now filled into the cope flash 4- in sui'iieient quantity to suitably pack between the. bars of the mold when the latter is jolted. The frame 5 is placed on the ties. -11 for the purpose of retaining a proper amount of sand to suitably fill the mold up to thecoinpletion oi the ramming e to the desired density. The mold having been joied or rammed, the runner gs to 25 is now drawn from the mold and the knoe zed out of the guide pins 17. The operator then places't-he lifting bail oi tl e hoist on the trunnions 3-li and slowly lifts the chill 3, cope flask i and rammed nioldYDuring this lifting operation the springs 9 expand and tend to. keep the chill 3 parallel to the pat corn for a suiiicient distance of the upward travel to prevent the sand oi the mold from pinching ofi at the point 12 where such action is most liable to occur in 'a. car wheel mold. a I have found that by the use oithe springs 9 of substantially equal tensiom'the mold can be started without requiring the opera tor to steady and: keep the 'mold and pattern, parallel when raising the moldwith a bail.

(Referring to Fig. 3, where the drag half tit-the mold. is shown, after the mold has been suitablyjolted orrammed, the mold is turned over or inverted by first applying the bail of a hoist to the trunnions 34 on the pattern so that the pattern is uppermost and the drag flask 26 is lowermost and resting on a suitable support. The operator now knocks out the keys 33 and the pattern is drawn upwardly by" the bailstill acting on the trunnions 34 As the inverted pattern rises, the springs 9 expand substantially equally and by their pressure on the inverted drag flask 26, cause an even drawing without danger of pinching oil of the" iao pinching off of the mold when the mold is drawn by means other than said spring means.

3. A pattern for molds, provided with coil springs positioned and adapted to directly cooperate with a chill or a flask to maintain the parts in parallelism and thereby insure a clean draw and prevent pinching off of themold when the mold s drawn.

4. The combination of a flask, a pattern, and spring means cooperating with the flask and pattern adapted to maintain the parts in parallelism and thereby insure a clean draw and prevent pinching off of the mold when the mold is drawn.

The combination with a flask, or a flask and chill, of a pattern, and spring means carried by the pattern adapted to directly engage either the chill or the flask to maintain the parts in parallelism and thereby insure a clean draw and prevent pinching ofl" of the mold when the mold is drawn.

6. A pattern for molds, provided with a plurality of spring devices located at different points around the pattern outside of the eflective molding face thereof adapted to cooperate with a chill or a flask to keep the parts relatively parallel when the mold is being drawn by means other than said spring devices, said spring devices insuring a clean draw and preventing pinching ofi' of the mold when the mold is thus drawn.

7. The combination with a pattern, of a flask, or a chill and flask, spring means carried by the pattern, adapted to cooperate with the chill or the flask, and means for releasably clamping the pattern to the chill or to the flask, said spring means being under tension when the parts are clamped together as aforesaid, whereby when the clamps are released and the mold is drawn by other means, said spring means will act to effect a clean draw and pinching 0d of the mold will be prevente 8. A pattern for molds, provided with spring means for automatically eflecting rectilinear movement thereof when the mold is drawn by means other than said spring means.

9. The combination with a flask, or a flask and chill, of a pattern, and spring means for automatically effecting relative rectilinear Inovementol the pattern when the mold is drawn by means other than said spring means.

In testimony whereof I aflix my signature.

WILLIAM C. NORCROSS.

Images