US1995008A - Apparatus for manufacturing radiators - Google Patents

Description

March 19, 1935.

s. D. PAYZER :1- AL APPARATUS FOR MANUFACTURING RADIATORS 2 Sheets-Sheet 1 Filed Aug. 7, 1933 INVENTORS ATTORNEY.

March 19, l935.- s. D. PAYZER El AL APPARATUS FOR MANUFACTURING RADIATORS Filed Aug. 7, 1933 2 Sheets-Sheet 2 qnuuuungn INVENTORS AQFL M BY WW atented Mar. 19, E35 7-7.1

APPARATUS FOR MANUFACTURING RADIATORS StanleyD. Payzer, Everett A. Preston, and Carl E. Staky, Wausau, Wis, assignors to D. J; Murray Manufacturing 00., Wausau, Wis., a corporation of Wisconsin UNITED STATES PATENT OFFICE Application August 7, 1933, Serial No. 683,942

7 Claims. (01. 22-131) I The presentinvention relates in general to im core mold for casting an elongated radiator sec.- provements in the art of manufacturing radiators tion provided with a multiplicity of radiating fins and similar structures havinga plurality of relawith, spaces therebetween; tively thin and closely adjacent fins constituting a Fig. 2 is a transverse vertical section through part thereof, and relates more specifically to imthe core mold of Fig. 1, taken along the line..2'2;, 5 I

proved apparatus for producing such structures Fig. 3 is an elevation of one of the end cores conby casting the same en bloc'. stituting the mold of Fig. 1, the view being taken It has. heretofore: been proposed to produce at the line 3-3 of Fig. 1; I

finned radiator structureszby casting the same a Fig. 4 is another transverse vertical section with the aid of a'plurality of adjoining fiat fin through the radiator mold of Fig. 1, taken along 10 cores each provided with-upper and lower lateral the line 44;

projections adapted to engage an adjacent core Fig. 5 is an additional transverse vertical secso as to produce afin space, the entire assemblage tion through the radiator mold of Fig. 1, taken of cores being confinedwithin a horizontally dicentrally thereof along the line 5-5; I

vided green sand mold prior tothe casting opera Fig. 6 is a longitudinal vertical section through 15 tion. Whilethis prior method of casting these a fragment of the mold assemblage of Fig.1, radiator structures'insures the production o1 reltaken along the line 66; 1 atively satisfactory castings, the'spacing projec- Fig. 7 is a central longitudinal verticalsection tions at the lowerv ends of the fin cores. are not through a similar fragment of the mold of Fig. 1,

desirable or necessary, andthe use of anenveloptaken along the line '7'- 7;' I v 3 ing green sand moldis also unnecessary andmere= Fig. 8 is a full top view of a castradiator secly. adds to the cost of production of the radiator. tion produced with a mold such as shown in castings. Fig.1; I I

The present invention therefore contemplates Fig. 9 is a transverse section through the radiand has for an object the provision of improved ator structure of Fig. -8, taken along the line 25 instrumentalities for constructing radiators. or 9-9; radiator sections of the finned type, of any de- Fig. 10 is a longitudinal'section through the sired length, with theaid of cores alone and'withradiator structure of Fig. 8, taken'along' the irout the use of green sand or other enveloping regular line 10-10; and r 3o molds for the cores. Fig. 11 is an enlarged central longitudinal sec-' Anotherobject of the present invention is to tion through a modified type'of'composite radi-' provide an'improved core assemblage for facili ator mold. tating the casting. of radiators or radiator sec- 'While the invention has been shown and detions of various lengths having integralcast fins scribed herein as being specifically appliedin con- 5 completely surrounding relatively larger fiuid junction with the casting of a particular type of 5 conducting conduits extending transversely of the sectionalv finned radiators, it; is not intended to fins and longitudinally of the radiators and interlimit the scope by such specific disclosure, and connecting the end'headers thereof. some of the novel features may obviously be more Still another object of the invention is to provide generally applicable to the casting of other kinds 40 improved apparatus for producing successive perof finned objects. 1

fect cast structures having a multiplicity of inte- Referring specifically to Figs. 1 to 7 inclusive, gral thin and closely adjacent spaced walls such the improved mold utilizedin casting radiator as fins, rapidly and with minimum waste of time sections, comprises in general a'b'ase ofslabcore and material resulting from defective castings. formed of interlockingbase portions 14, 15; a

These and other objects and advantages will be pair of spaced radiator end chamber cores '16 rest- 45 apparent from the following detailed description. ing upon and projecting into recesses in the main Aclear conception of several embodiments of base portion 14 andinter-connected by one 'or apparatus adaptedto carry on the commercial exmore parallel radiator conduit cores 1'7; .and a ploitation of the present mode of casting finned plurality of fiat rectangular end and fin cores v radiator sections, may be had by referring to the locked to the slab core and coacting with each '50 drawings accompanying and forming a part of other and with the chamber and conduit cores this specification in which like reference charac- 16, 17 to complete the mold structure, I J ters designate the same or similar parts in the va- The portions 14, 15 of the base corehaving a rious views: longitudinally interlocking tongue and groove 5.5 Fig. 1 is a part sectional topyiew of; onetype of joint 18 and may be of any desired length depending upon the length of the radiator sections which are to be cast, and the base core may be and fin cores, in order to firmly hold these upper cores in assembled position. The main portion 14 of the base core is moreover provided'with a center gate 22 which communicates with passages 23 leading upwardly through the central portion of the upper supporting face'of this core, as clearly shown in Fig. 5. c

The radiator manifold or end chambercores 16 are provided with upper and lower core prints 24, 25, of which the-lower prints 25 rest upon and project into a recess in the upper face of the slab core portion 14 and thus provide supports for the cores 16, while the upper prints 24 coact with and project through a hole in the upper portions of the end fin cores. The radiator conduit cores 17 may be one or more in number, and have their end portions 26 inserted in side recesses of the manifold cores 16 as shown in Fig. 6, being thereby supported parallel to each other and-in vertically spaced relation with respect to-the upper surface of the slab core portion" 14'. Q

Disposed at each end of the mold and beyond the adjacent manifold core 16, is a series of three adjoining relatively thick rectangular cores 2'7, 28, 2 9. The extreme end cores 27 are merely fiat, slabs having locking projections 21 at the opposite lower side portions thereof, engageable with the tapered locking grooves of the supporting core portions 14, 15. The outer end'faces of the end cores 27 are adapted to be engaged by clamping devices 30 of any desired construction, coacting with the base core confining box 19, and the upper and side portions of the opposite face of one of the cores 27 is provided with lateral projections 31 adapted to interlock with a groove in the ad-.- joining and gate core 28. These end gate cores 28 are shown in Fig. 2, being provided with latere al passages 32 and with other smaller passages 33, 34 which register horizontally with similar openings extending through intervening cores throughout the length of the mold. The innermost thick cores 29 of the end series, are merely provided with through openings or passages 33, 34 as shown in Fig. 3, and all of the cores disposed between the outer end cores 27 are interlocked with the adjoining cores and with the supporting slab core portions 14, 15, by means of projections 31, 21 in the manner previously described. The thick end cores 2'7, 28, 29 are all supported directly upon the upper horizontal surface of the slab core portion 14, and snugly engage each other'as well as the portions 14, 15.

Coacting with the innermost thick rectangular cores 29, are thin cores 35 which have internal walls spaced from the manifold cores 16 to provide chambers 36 surrounding these cores andcommunicating with the end gate passages 32 through the-passages 33, in the cores 28. These thin cores 35 are also constructed to provide thin fin spaces 3779.15 the. opposite sides. of and communicating with the space or chambers 36, and these fin spaces-37 also communicate with the end gate passages 32 through the passages 34 in the cores 28.

, Interpo'sed between the inner cores'35, is aseries.

the passages 34 extend throughout the of thin fin cores 38 which complete the mold structure. These cores 38 have internal walls which completely surround and are spaced from the header cores 1'7 to provide chambers 39, and are also formed to provide thin fin spaces connecting the chambers 39 and communicating with the end and center gate through the passages 34, 23 respectively. Both sets of thin cores 35, 38 rest directly upon the upper surface of the slabcore portion 14 and are locked to the base core by projections .21 formed integral therewith, and all of these cores 35, 38 are moreover provided with interlocking projections 31 at the top and sides thereof,as"shown in Figs. 1, 4 and 5. The passages 33 which communicate with the end gate passages32, are preferably disposed in alinement with the chambers 39, and as previously indicated, length of the mold and penetrate the thin cores 35, 38. The fin forming cores 35, 38 coact with each other only along the top and sides, but not at the bottom, and the fin spaces 37, 40 and the header chambers 36.. are bounded at the bottom only by the slab core portion 14.

When it is desired to produce a mold in accordance with the present method, the individual cores are first properly formed in a well-knownmanner, of the usual core sand and of the various shapes above described, and slab core portions 14, 15 of proper length dependent upon the length of radiator section which it is desired to cast, are selected. One setof end cores 2'7, 28 29 are then assembled upon the slab core portion 14 after which the corresponding group of cores 35 is assembled about the adjacent manifold core 16 having the header core 17 attached thereto. The fin cores 38 may subsequently. be assembled upon thebase core portion 14 over the header cores 1'7, and the length of the radiator structurewi'll depend upon the actual number of individual fincores 38 which are utilized. After the fin'co'res' 38 have been applied, the .opposite manifold core 16, thincores 35, and thick end cores 29, 28, 27 may be applied to complete the mold assemblage, and the assembled cores may be finally locked in assembled position by applying the locking base core portion 15, inserting the base core within a retaining box 19, and by applying. the end clamps 30. During the mold assembling operation, it may be found necessary to insert chaplets around the conduit cores 17 if these cores are relatively long, in order to prevent raising or shifting thereof when metal is poured into the mold, and it may also be found desirable to grind the fin cores 35, 38 to proper width in order toinsure proper length of the final mold. Such grinding may also be resorted to along the upper face of the slab core portion 14, and along the bottom surfaces of all cores which coact with this surface. The interlock afforded by the projections '31 of the upper cores will insure perfect alinement of these cores at all times, and will also prevent undesirable escape of metal during the casting operation.

When the mold has been thus properly assembled, the casting-operation can be effected without embedding the composite core mold in green sand or the likeysince the coacting cores insure provision of tight metal receiving chambers and spaces. The metal may be admitted to the end and central gates and flows through the passages 32, 33, '34, 23 into theflchambers 36, 37, 39, 40 to produce a one-piece radiator section such as shown in Figs. 8,9 and 10. In thisradiator section, the manifold chambers 36, headers 39' and fins 3'7, 40",:are all formeden bloc, and the outerare integrally produced by the pascores can be removed from the internal chambers 16, 17 through the openings 24, 25' one of each of which may be subsequently plugged, and the others of which may be utilized as inlet and discharge openings in the final radiator. If end inlet and discharge openings are preferred, the upper core prints 24 may be omitted from the chamber cores 16 and replaced by core prints extending through the outer end walls of the'manifolds 36', but this method of casting insures production of uniform.

fin thickness and spaces between the fins 37', 40'.

In order to positively guard against undesirable variation in the lengths of the radiators, a structure such as shown in Fig. 11 may be utilized. In this assemblage the fin cores 38' and one of each group of end cores 35', are provided with tapered lower end projections 41 which are adapted to coact with uniformly spaced transverse grooves 42 formed in the upper part of the base core portion 14'. During assembly of this mold, the fin cores 38 can be ground to such thickness that they will exactly fit within the successive spacing notches or'grooves 42 in the slab core, so that all radiator sections produced will be of precisely the same length. The radiator sections will be the same as shown in Figs. 8, 9 and 10, and the fins 40' and intervening spaces will again be uniform.

From the foregoing description, it will be apparent that the present invention provides an improved apparatus for forming and assembling molds for the production of finned radiators or the like, whereby the radiator sections may be rapidly produced without the aid of green sand molds, and without loss of time and materials due to defective castings. Each successive cast ing produced by the improvement should be perfeet and precisely the same as the others, if ordinary care is taken in assembling the molds. The fins 37', 40 may be cast closely adjacent to each other and of minimum thickness, and the cores 35, 38 are effectively spaced apart to provide the fin spaces and locked in alinement with each other along the sides and top only, thereby simplifying the construction of these cores. The cores may moreover be ground to provide tight joints, and may be cemented or pasted wherever desirable, although such cementing may ordinarily be dispensed with.

It should be understood that it is not desired to limit the invention to the exact details of construction and to the precise method of core mold assembly herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. A mold for casting finned objects, which comprises, a slab core having undercut recesses in the opposite sides thereof, a conduit core spaced from said slab core, and fin cores resting upon said slab core and surrounding said conduit core, said fin cores having projections on the opposite sides thereof extending within said slab core recesses and each of said fin cores having a tongue projecting from one face thereof and a groove in its opposite face interlockable with the grooves and tongues respectively of adjoining cores.

2. A mold for casting finned objects, which comprises, a slab core having parallel spaced undercut recesses therein, andaplurality of fin cores resting in stackedrelation upon said slab core and having projections at the lower opposite sides thereof extending within said slab core recesses, each of said fin cores having a tongue projecting from one face and a corresponding groove in the opposite face thereof interlockable with the grooves and tongues respectively of adjoining cores.

3. A mold for casting finned objects, which comprises, a slab core comprising separable sections forming spaced parallel undercut recesses and a supporting surface forming the corresponding side of said recesses, and a series of coacting fin cores resting upon said surface and having projections confined within said recesses to prevent displacement of said fin cores away from said slab core, each of said fin cores having a tongue projecting from one face thereof and extending around the core center from one portion of said surface to another, and each of said fin cores also having a corresponding groove in the opposite face thereof, said tongues and grooves being interlockable with the corresponding grooves and tongues respectively of adjoining cores. 7

4. A mold'forv casting finned objects, which comprises, a slab core having spaced undercut 30 recesses connected by a common supporting surface, and a plurality of coacting fin cores resting upon said surface and having projections disposed within said recesses to prevent displacement of said fin cores away from said slab core,

the adjoining fin cores having interlocking tongue respectively a groove and an at theircoacting faces extending from one portion of said slab maintain said fin cores in interlocked relationship and to prevent displacement of said fin cores away from said slab core.

6. A mold for casting finned objects, which comprises, a slab core comprising coacting elongated sections having parallel spaced undercut recesses connected by an upper supporting surface, anda plurality of interlocking fin cores resting upon said slab core surface and having projections at the opposite lower side portions thereof interlocking with said recesses to prevent displacement of said fin cores away from said slab core surface.

7. A mold for casting finned objects, which comprises, a slab core having spaced undercut recesses extending longitudinally thereof and a surface connecting said recesses, and a plurality of fin cores coacting with each other to provide fin spaces bounded at the bottom by said slab core surface, adjoining fin cores having interlocking grooves and tongues and all of said fin cores having projections interlocking with said slab core recesses to prevent displacement of said fin cores away from said slab core surface.

STANLEY D. PAYZER.

EVERETT A. PRESTON. CARL E. STAKY.

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