US1749454A - Mold pattern - Google Patents

Description

F. W. TICKNER ET AL March 4,v 1930.

MOLD PATTERN 2 Sheets-Sheet l Filed Feb. 4, 1929 INVENTORS l I l l I I l l l l L I I i l l I l Il March 4, i930. F. w. TlcKNER ET Al. 1,749,454

MOLD PATTERN Filed Feb, 4, 1929 2 Sheets-Sheet 2 -Patented Mar. 4, 1930 ,Unirse STATES 'PATENT oFFicE FRANK TICKNER, OE SHARON, AND JAMES THOMAS, OF SHARPSVILLE, PENNSYL- VANIA, ASSIGNORS TO SHENANGO-PENN MOLD COMPANY, OF SHARPSVILLE, PENN- SYLVANIA, A CORPORATION O F PENNSYLVANIA MOLD rAfr'rnRN kApplication led. February 4, 1929. Serial No. 337,248.

The present invention relates to mold patterns and more particularly to patterns for forming sand mold wallsy for use in casting metal.r It relates still more particularly to s an improved construction of suchy patterns,

-whereby to increase their strength and reduce the cost of manufacture. o

Patterns for rmolding sand walls have heretofore been generally of two classes. Normally such rpatterns are made of wood, the molding surface being smoothed or finished to conform to the surface desired on. the casting. Insome instances patterns have been made of metal, y comprising in themselves unitarycastings.

, l, Both of the classesl of patterns above referred to have inherent disadvantages. Wooden patterns are comparatively fragile and their life isshort.y During the molding V operation it is of course necessary to provide some meansk byk which the pattern may be lifted'to separate the'pattern and mold. The

l usual practice when wooden patterns have been used is to screw metal eyes intothe upper portions of the' patterns to provide a connection for a crane hook or sling. Repeated lifting of the'pattern, together with the jars, jolts' andl stresses to Lwhich it is normally subjectedinuse, not only cause' a rapid detevau rioration of the pattern as a whole, but also tend to loosen the metal eyes so that the samel often are stripped from the pattern during a lifting or carrying operation, further kresulting in damage to the pattern. Itis almost impossible to make a pattern which is formed substantially entirely of wood which is strong enough to withstand normal usage for any great period* of time. Even though wooden patterns may retain their integrity theyoften become strained out of proper alinementand hence are of little value if accurateL castings are to be made.

Metal patterns have two ygreat disadvantages. 'The first of'these is their excessive weight. Great weight 'is neither' necessary nor desirable in a pattern as the pattern is merely used to serve as a retaining wallfor sand ypacked thereagainst and no great stresses are imparted to it in the actual molding operation. IGreater power is required to lift heavy metal patterns than is required for lighter'ones. The second disadvantage attendant upon metal patterns is their high cost due to the large mass of metal comprising them, and due to the necessity of casting each pattern in a specially prepared mold. Thus the wooden. pattern is too light and fragile and easily destructible, whereas the metal pattern is too heavy, cumbersome and eXpenslve.

We provide a pattern for molding sand for casting, comprising a composite wood and metal structure designed-to obviate all of the various'disadvantages above noted with respect to both the wooden and metal constructions heretofore known. We provide a pattern comprising a body of wood and metal braces extending lengthwise thereof for reinforcing and strengthening the pattern. `We further provide a pattern comprising a wooden member forming a molding surface, and metal braces connected therewith for reinforcing and strengthening the pattern and projecting therefrom to provide means for lifting the pattern.

In the accompanying drawings we have shown certain present preferred embodiments of the invention, wherein,

Figure y1 is a horizontal cross section through a pattern,

Figure 2 is a kpartial elevation of the pattern shown in Figure l,

Figure 3 is an elevation with a portion cut away of a pattern similar to that shown in Figures 1 and 2, but of a dierent shape,

Figure 4 is a vertical cross section through the pattern shown in Figure 3, and

Figure 5 is a top plan view of the pattern shown in Figures 3 and l.

Referring more particularly to the drawings, reference numeral 2 designates generally a built up wooden structure forming the molding surface of the pattern. This structure may be of any desired shape, depending upon the shape of the mold in which the metal is to be poured. The pattern shown in Figures l and 2 is of square cross section with rounded corners and is yadapted for the formation of a sand mold for casting ingot molds. This pattern has an outer nails, glue, or both. y Y

The pattern shown Vin Figures 3, 4 and 5 is structurally similar to that ofFigures l" and 2, but is of round cross section. It has inner and outer molding surfaces 6 and, respectively, connected by braces 7..

The built up wooden structures are not of themselves of sufficient strength to withstand the usage to which the patternsare put. In Vorder to strengthenthe patterns and to assist in maintaining their integrity and alinement, a metal construction is used, as will now be described.

A metal plate 8 is provided at the top of the' wooden pattern member andy another metal plate 9 is vprovided at its bottom. These plates preferably rconform exactly to the cross section of the wooden pattern member at its top and bottom, respectively. They are of suflicicnt thickness to assist in rigidly holding the pattern together, but are at the Sametime light enough not to unduly inf crease its weight. n

Joining the plates 8 and 9 are metal rods or bolts l0. Such rods or bolts are fastened to the bottom plate 9 in any suitable manner as by screw threads, as shown in Figures 3V and 4. They pass upwardly of the pattern between the inner and outer mold wallsandl atthe top pass through holes appropriately provided in the plate 8. Nuts 11 are threadedover the upper extremities of the members l0 and are tightened downagainst the plate 8. Thus the wooden pattern mem- Y ber is in effect compressed between the oppol eyes l2 sitely disposed metal plates 8 and 9, which are held together by a rigid metal structure comprising the members l()` and the nuts 11. Some or all of the nuts are provided with for the reception of a crane hook or sling. 'p f The members 10 are spaced andvbraced with respect to the inner and outer mold walls by spacing members 13 disposed at intervals axially of the pattern. Such members not only prevent a possible looseness of the members l() between the mold walls, but assist in strengthening the wooden structure by bracing .it at intervals against the metal rods. The wooden struct-ure is thus braced both vertically from top to bottom and horizontally at intervals axially thereof.

In lifting, the stress is applied first to the eyes l2', then to the rods 10, and is transmitted directly by such rods to the bottom plate 9. The wooden structure is subjected to very llittle if any stress `during the lifting operation, as it is directly carried by the plate 9 through the agency of the rods 10.

The fact that the wooden'structure is contained between the two oppositely disposed vmetal plates, and is vsomewhaty compressed therebetween by "reasonof the nuts 11, prevents any'appreciable looseness or tendency to disintegrate. The spacers 'lrmay extend completely `around the pattern, thus even more rigidly holding it together. n

Thus a pattern is provided combining lightness of weight, cheapness of kmannfacture, and strength. .Although the em-k bodiments shown 1n the drawings are par-` ticularly adapted for forming sand molds for casting ingot molds, it is to be understood that the invention is not limited to such type of pattern or to any similar type, but may be otherwise Yvariously f embodied within the scope of the following claims. y Y

' We claim:

l. A pattern for molding sand for cast-` Y* braces extending lengthwise thereof for reinforcing and strengtheningthepattern, the

pattern being adapted to be moved intact' from place to place.,

2. A pattern for molding sand for casting,

comprising av wooden member forming a molding surface, and metal braces connected therewith forj reinforcing and strengthening the pattern and projecting therefrom to pro-V videvmeans for liftingthe pattern. Y

3. A pattern for molding sand for cast- Y ing, comprising a built-up wooden pattern member, and braces connected withthe built-V up member and extending from end to end thereoffor maintaining the integrity of such member and reinforcing and strengthening the same, the pattern being adapted to be moved intact from place to place.

4. A pattern for molding sand for cast-k strengthening member' and `extending upwardly of the pattern to provide means'for lifting the pattern. y

6. A pattern for molding sand for casting, comprising a wooden pattern member, Vmetal plates on the top and bottom thereof, and

braces connecting the plates. f

7. A pattern for molding sand forV castving,-comprising a hollow Iwooden pattern member having molding surfaces on. boththe inside and outside thereof, and metallic strengthening means connectedwith the pattern member and providing means for taking a lifting stress to lift the pattern.V

comprising a body of wood land metalV 11.5 Y of, and metal members connected with the Y 8. A pattern for molding sand for casting, comprising a pattern member having inner and outer molding surfaces, and bracing members connected with the pattern member and extending therealong between said molding surfaces.

9. jA pattern for molding sand for casting, comprising a pattern member having inner and outer molding surfaces, metal strengthening'members at the top and bottom of the pattern member, and brace rods extending between the inner and outer molding surfaces and connecting the strengthening members.

, 10. A pattern for molding sand for casting, comprising a built-up wooden pattern member having inner and outer molding surfaces, and metal strengthening members between the inner and outery molding surfaces for maintaining the integrity of the pattern and reinforcing and strengthening the same.

1l. A pattern for molding sand for casting, comprising an elongated pattern member, a plate at the bottom thereof, and rods connected with the plate and extending upwardly of the pattern member, the rods having at their per ends means or attaching lifting means for lifting the pattern.

In testimony whereof we have hereunto set FRANKy W. TICKNER. JAMES THOMAS.

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