US2242985A - Mold - Google Patents

Description

R. Z-EUNERT May 20, 1941.

MOLD

Filed Dec. 10, 1940 9 4 b 5 9 6 H W zww T m X z m J W 5 v I 9 9 0 Z 9 H 6 W W W z a w ,Z

R0 eri Zezuzeri Patented May 20, 1941 UNITED STATES PATENT OFFICE MOLD Robert Zeunert, Chicago, Ill.

Application December 10, 1940, Serial No. 369,475

.1 Claim.

This invention relates to molds and more particularly for a mold for forming a cylindrical die having a design recessed therein.

An object of this invention is to provide an improved mold by means of which a cylindrical die may be formed which has recessed in the periphery thereof a suitable design so that the casting may be used in the formation of plastics having a raised ornament or design.

Another object of this invention is to provide an improved method of forming a die which includes providing a split mold and adhesively securing the ornament or design on the inner arcuate surface of one or more portions of the mold so that when the molten metal is poured into the mold, the ornament will appear as a recess in the die.

A further object of this invention is to provide an improved method of producing a cylindrical ornamented die which includes a molding means so formed as to substantially eliminate the machining of the die after it has been cast, the mold including means for supporting die bearings therein in order that the bearings may be embedded in the metal forming the die,

A further object of this invention is to provide an improved mold for producing a cylindrical ornamented die which is formed in sections adapted to be superposed one upon the other so that different lengths of dies may be formed from the same base mold structure.

A further object of this invention is to provide a mold of this character which may be used for the formation of a number of dies and which will eliminate the use of molding sand.

To the foregoing objects and to others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawing wherein are shown embodiments of the invention, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawing:

Figure l is a detail top plan of a mold constructed according to an embodiment of this invention.

Figure 2 is a sectional view taken on the line 22 of Figure 1.

Figure 3 is a detail side elevation partly broken away and in section of the assembled mold.

Figure 4 is a sectional view taken on the line 44 of Figure 2.

Referring to the drawing, numeral [0 designates generally a base member which in the present instance is annular in configuration and is formed with a reduced annular upper part II which forms the bottom wall of the assembled mold. The base I0 in substantially the center thereof is provided with an upwardly opening socket 13 within which the lower end of an upstanding shaft I2 removably engages.

A pair of semi-cylindrical mold forming bodies [4 and I5 are adapted to engage about the upwardly offset reduced part II and to extend upwardly therefrom. The exterior diameter of the upwardly oifset base part I I is substantially equal to the inner diameters of the mold forming bodies 14 and IS. The body I5 is provided along its vertical free edges with a pair of laterally projecting ears l6 and I1 and the mold forming body I5 is provided with a pair of upstanding laterally projecting ears l8 and H), which are adapted to confront the ears l6 and H. The two mold forming bodies l4 and I5 are held tightly together by means of'fastening devices 20 which engage through the ears l6 and. I8 and by fastening devices 2|, which engage through the ears l1 and 19.

A pair of semi-circular mold extension members 22 and 23 are adapted to engage on the upper surface of the body l4 and are secured thereto in superposed relation by means of bolts or machine screws 24, which extend downwardly through openings 25 and 26 formed in the mold extension members 22 and 23, respectively, and are threaded into threaded sockets 21 which are formed in the upper edge of the body 14. A second pair of mold forming extensions 28 and 29 are disposed in superposed relation on the mold forming-body I5, being secured in superposed relation on the upper edge of the body [5 by means of bolts 30 or the like. When the two bodies l4 and I5 are secured together, the open ends of the extension 22, 23, 28 and 29 confront each other so as to form a continuous cylindrical mold extending upwardly from the base member The shaft I2 is held axially of the base I0 and of the cylindrical opening formed by the core bodies 14 and I5 and extensions disposed in superposed relation thereupon by means of a diametrically disposed shaft support bar 3|. The bar 3| is provided at a central point with an enlarged shaft receiving bushing 32 and at the opposite ends thereof, the bar 3| is provided with upwardly offset ears 33 so that a portion 34 of the bar 3| may extend partly into the uppermost of the pairs of extensions 23 and 29. The bar 3| is secured to the mold extensions 23 and 29 by means of bolts 35 and 36 and an intermediate bolt 3! is extended through the ears 33 of the bar 3| and threadably engages in a threaded opening 38, which is formed partly in the free edge of the uppermost extension 23 and partly in the confronting edge of the extension 29. A lower removable sleeve 39 is disposed about the shaft i2iand at its-lower end rests on the upper surface of the oiTset base member I I.

A second or upper removable sleeve 49 is disposed in upwardly spaced relation to the lower: sleeve 39 and is held in spaced apart relation.

with respect to the sleeve 39 by means of a cylindrical core member 4|. The upper end of the lower sleeve 39 is removably extended as at.42

into the lower end of the cylindrical core' il' The core M loosely engages about the shaft l2 and when the two sleeves 39'and4il and the frangible-coreat are in applied position about the'shaft' 12;- the upper end of'the bearing sleeve 46" will substantially contact with the undersurface of the shaft supporting bar 31; The'supportingbar 3i not only-provides a means for holding the shaft [2 concentric of the mold forming bodies is and IE; but also provides a means for holding the semi-cylindrical 'mold extensions in" assembled position. v

Themoiten'metal is adapted to be poured into the" assembled mol-d'fromae point adjacent the lower end thereof, the mold forming bodies l4 and I5 being provided'with complementary'and confronting semi-cylindrical openings 44 and 45 which also extend horizontally outwardly through the ears Iii-and l8, respectively. A removable boxing generally designated as 46' is adapted to be mounted on the vertical edges of the-ears Hiandlfiand comprises a pair of cornpl-ementary housing members t? and 4% which are formed with vertically disposed complementerry-passages tQ-and 58; respectively; The lower ends of the passages i and 58 communicate with horizontal passages 51" and 52'andth'e horizontal passa'ges fil and" 52' are adapted to be disposed in-horizontal alignment with the horizontal passages id and 45. The complementary housing members 4'? and 48 are secured together by means offasteni'ng devices 53and the'assembled housing lt' which constitutes a pouring spout is securedto the ears l6" and 58 by means of fastening devices 54.

'IheloWer-removab'le sleeve 39'is provided in and is placed in use, the upper bearing 40 will I5. In-Figure 4, there are'disclosed-two of these ornaments 59 with one of the ornaments adhesively secured to the inner surface of the mold body l4 and the other ornament adhesively secured to the inner face of the mold forming body I5. It will be understood that if desired, there may be only one of these ornaments within' th'e'm'old' so that the cast die will only have oneornament recessed therein.

The ornament 59 may be made out of any suitablematerial such as clay or the like which will not be" damaged or burnt by the molten metal and the ornament is preferably adhesively secured'by any-suitable adhesive to the inner surface'of one or both of the mold forming bodies I i-and 15'; Where the ornament 591s substantially'wider than the heightof the mold forming bodies M-and l5, 'th'e'ornament may have a portion thereof adhesively secured to one or more of the mold forming extensions secured to-the upper ends of the mold forming bodies M and" I In" order to provide a means whereby the molten metal'which-is poured into the mold hereinbeforedescribedmay besereened as it flows upwardly inthe mold so-as to remove any scale or other foreign matter from the-major part of the" outer portion of the body of metal'supplied tothe -m'olding-chamber and for such purpose a removableupstanding filtering screen 6B is provided The screen 88" is ofcylindricalform and isdisposed about and inspaced relation with respect to the" core member 41- and it isalso spa-cedfromthe sidewall of the'molding'chamher or cavity; The lower end of the filtering soreentil' isadaptedto-rest on the base member H and extends upwardly above the core member fi l? The length ofthe filtering member 9 "-is-"preferabl-y slightlyshorter than the depth of the mold; The-filtering screen fifi'may be made of meta-tor other suitable material which will become-embedded within and reinforce the die but whichwi'll not melt under the heat of the molten meta-l; A metalconducting tube! the'peripheral surface thereof with a pair of Vsha-ped grooves or channels 55 and 56 within whichthe molten metal is adapted to engage so that when the" sleeve" 39 is cast or embedded with" the: die, the sleeve 39willb'e held. against endwise movement. and against rotary movement relative to the die by the metal which will flow into the grooves 55and 56'. Tl'ieupper sleeve 46 isv-also provided with apairofvV-shaped recesses or annular channels 5.? andEB' within Which" the molten. metalis adapted to engage so that when the die is removed from the mold curing members M ami-39.

' is disposed intheconfronting channels 45 of the mold" sections and extends inwardly into the interior'of the mold and projects slightly through the filtering screen 69 adjacent the lower end thereoii The-conducting tube 6! after the die hascooledis adapted'to be'cut off at the pe riphery of the di-eand will have a'portion thereof embedded within the die;

' m the use of this mold structure the mold members I 4 and It with the extensions 22; 23; 28 and 29 are secured tightly together by theiastening devices 26 and 2! and the extension'se- The ornament 59 is adhesively securedto sthewinner surfaces of one or both of the mold forming bodiesid'and' I5inthe'desired position between the upper and lower ends of the mold and the shaft l 2" is inserted inothef socket !3.. The sleeves SQland Ml with the cylindrical core iii are then placed alb'oultthe shaft l2'and'the clamping bar 31 is then secured to the upper ends of the extensions 23 and 29. The intake housing 46 through which the molten metal is adapted to pass is secured to the ears l6 and i8 and then the molten metal may be poured through the confronting passages 49 and 50 so that the molten metal will flow through the confronting passages 44 and 45 carried by the ears I6 and I8, respectively.

The molten metal may be poured until it reaches the undersurface of the bar 3|. After the molten metal has cooled, the mold forming bodies I4 and I5 and the several mold body eX- tensions may be separated and the shaft 39 removed from the base It) and from the sleeves 39 and 333. The frangible core 4! may then be broken or otherwise removed from the center of the die and the exterior surface of the die may then be smoothed off if such operation is necessary.

The peripheral surface of the die will have recessed therein the configuration. of the ornament 59 and thereafter the die may be used in the conventional manner in forming embossed designs in plastic or other material. By providing an improved mold as hereinbefore described the process of forming a cylindrical die with a recessed ornament has been greatly simplified and the mold may be used for any number of times that may be considered necessary with the same ornament. It will be apparent that the same size mold may be formed for different ornaments by merely removing the ornament 59 and adhesively securing one or more different ornaments Within the mold forming bodies. After the die has been removed from the mold, there will be an L-shaped projection extending therefrom which embodies the molten metal which remains in the pouring spout. This metal may beremoved from the die by cutting the same at the point where the. L-shaped metal merges with the die.

What I claim is:

A mold comprising a base having an inset upper portion, a knockdown body of annular form seated on said base, encompassing said portion and forming in connection with the latter a cylindrical molding chamber, a shaft seated at its lower end in and axially of said portion and extended above said body, said body being formed in. proximity to said portion with a horizontal passage opening into said chamber, a housing secured against said body and provided with an upstanding L-shaped channel having its horizontal leg registering with the outer end of said passage, a bar secured to and disposed diametrically of the top of said body and through which said shaft extends, a core within said chamber and arranged above said passage and spaced from said bar, a vertically disposed combined holding, supporting and spacing element for the core mounted at its lower end on said portion, encompassing said shaft and detachably engaging at its upper end in the bottom of the core, a vertically disposed combined holding and spacing element having its upper end abutting said bar, encompassing said shaft and having its lower end detachably engaging in the top of the core, and an ornament on the inner face of said body spaced from the core.

ROBERT ZEUNERT.

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