US2332856A - Molding die for balance weights - Google Patents

Description

Oct. 26, 1943. H. J. KALAJIAN MOLDING DIE FOR BALANCE WEIGHTS Filed Jan. 30, 1941 \llll qw- Lill fl II II III 25 m Fig-3- F 7. wfgij 'tion but omitting any suitable support for nA-naof Fig. 5, v e

'F-igi 3 isan enlarged elevation of one of the.

Patented Oct. 26, 1943 Harry J. Kalajian, Detroit, Mich., assignor to yHarley C; Loney Company, Detroit, Mich 'a corporation of Michigan a V y Application .ranua fso, 1941, SerialINo. 376,609! f Claims. ((122-116) "The present invention relatesto die'casting and more particularly to a sectional die, particularly adapted for producing spring clip wheel balancing weights.

Spring clip wheel balancing Weights 1oiI the character comprising a weighted bodyportion and a spring clip about which the body portion is molded present a manufacturing difficulty in thediificulty of quickly arranging casting molds in combination with the spring clipsabout anchoring feet of which the weighted body portions are cast. According to the present invention,,the weighted body portions are "die cast about the anchoringffeet of the spring clip. The die casting is expedited by providing one ofthe sections of an sectional die with-a plurality. of pivoted flanges over which the spring clips are sprung. When the spring clips are arranged on such flangesfand the. die sectionsare disposed together, casting metal is forced into the mold underpressure. The die sections may then be separated and the pivoted flanges swung outwardly withrespect to their associated sections to per mit removal of the spring clips and the balance weights cast thereon. 1

'Ajnobject of the invention is to provide astructnre by means of which. a plurality of balance weights maybe die cast at the same time.

Another object of the invention is to provide afstructure. wherein a spring clip for balance weights; may be supported with respect to a die. section with anchoring foot portions projecting into molding cavities; i

Still. another object of the invention is; to provide a structure wherein there are facing die secing of spring clips in association with the die section for the casting of asubsequent group of balance weights;

These and other objects residing in the: ar rangement, combination and construction-of the:

parts will beapparentfrom'the following specification when takn with the accompanying drawn Jnwhich H 1 Fig. 1 is a sideelevation disclosing my invigfrontdie section; Fig. 2is a section onthe line II'II of Fig. 1, a detail of the section being shownby the line molding cavity forming recesses in the front die Section, a

Fig. 4. is an enlarged elevation of onetoi'the molding cavity forming recesses of a 'rear die sectionshowing the spring clip lretaining flange.

association-therewith, I v Fig.5 is an enlarged vertical section through cooperating front and. rea die section's-showing the manner in which thespring clip supporting flange projects thefanch oring .foot'oi the spring clip intothe molding cavity;

Fig. 6 discloses a"balanceweight on itsgsupporting flange after it has been cast about the anchoring foot of the spring clip and immediately prior tobeing' removed from its flange, I

Fig. 7 is an end elevationo f a s'pring. clip by itself, Q Q

Fig. 8 is aperspectivevview of a finished bal ancing weight cast about its spring clip, and j Fig. 9 is a section correspondingjto a portion of Fig. 2 disclosing anotherfeature of the inven- Refer'ring pa ticularly to the'drawings which disclose die casting apparatus for forming wheel] balancing weightsQbut omit the, molten metal delivery nozzle and associated structure which may be of any suitable character the reference character I indicates asllppltiglllded jfor slid' ing movement on rods; '2; The su'pport I has connected thereto a base} which are guided by ways 4 rear die sectionsti and 6].; Suitably sup-i ported byfmeans not shown; with' respect to: the

base 3, but independently thereof is airont plate I in which are supported front die sections 8' and 9. As shown paricularly in Fig. 2 the front? diesections 8 and 9 co actwitlithe; reari die providing a pair 10f sections 5 and 6 respectively sectional casting dies. I

The front dies sand 9 areeach provided with a plurality of recesses particularlyin; dotted outline in Fig.1 and in Figs. 2 an -3.1? op posing the recesses H1 andin theirear dissections 5 and Bare. a plurality of recesses llf Whichfaref shown particularly in Figs. l, 2 and 4. Communicating with each of the recesses I l arefrunners l2 which in turn communicate with run to a sprue opening l4 shownparticularlylin'lli l 2. The sprue opening [4 is provided witha molten metal delivery nozzle receiving seat l5 against which the metal delivery nozzle is urged ina con.- M ventional manner. H As shown particularly inFigfl, thefrear .die sections 5 and 6 are provided witntwo groups of". recesses ;l 1. One groupioirecesses ll of each of the rear die sections 5 and 6 is in molding cavity forming relation with the recesses w in the front dies 8 and 9 respectively, while the second group of recesses H in the rear die sections 5 and 6 is disposed at one sid of the front plate l carrying the front die sections 8 and 9.

Each of the recesses I is intersected by a flange receiving recess shown particularly in Figs. 4, 5 and 6. Within each recess 23 is disposed a flange 2| pivoted about a pin 22. Each flange 2| is provided at the outer end thereof with a portion 23 for receiving a springclip 24. Each portion 23 is shaped like a wheel rim flange on which the spring clips 24 will ultimately be used when they have balance weights cast thereon and have widths equal to those of the spring clips 24.

The spring clips 24 are each provided with an 7 anchoring foot 25, particularly as shown in Figs. 5 and '7, about which its balancing weight is to be cast. When a flange 2| is disposed in its recess 20, a spring clip 24 on the portion 23 thereof is so arranged as to project the anchoring foot 25 into the cavity formed by the recesses I 0 and of the front and rear die sections respectively; Furthermore, as shownin Figs. 5 and 6, the portions 23 for receiving the spring clips 24 are provided with recesses 25 which are in alignmentwith,

the recesses II with which theyare associated and form continuations thereof. Y

In operation, with the rear die sections' 5ian'd 6 positioned as shown in Fig. 1, and the support the flanges 2| of the recesses H which have just i I moved to one side of the front di sections 8 and 9 maybe swung outwardly, the balance weights 28 cast on the spring clips 24 positioned thereon as shown in Fig. 6 may be removed, and new spring clips 24 may be positioned on the portions 23 of the flanges 2| for the next casting operation. The die is then opened by moving the support I and together with it the base 3 and the rear die sections 5 and 6 along the rods 2 from cooperating relation with the front die sectiOns 8 and 9. The die should be designed in a. conventional manner to cause the sprue to fall away when'the die is opened. As soon as the die has been opened, the rear die sections 5 and 6 are longitudinally moved in opposite directions to dispose the flanges 2| having the balance weights supported therefrom laterally of the front die sections 8 and 9 as described and to move the opposite ends of the rear die sections 5 and 6 into alignmentwith the front die sections 8 and 9.

In Fig. 9 another feature of the invention is disclosed. The rear die section 5 is asdisclosed in Figs. 1, 2, 4, 5 and 6. The front die section 30 corresponds to the front die section 8 and cocarrying with it the base 3 and the rear die sec- I tions 5 and 6 moved to the left. as viewed. in V Fig. 2 with respect the front diesections Sand 9, to open the die, the flanges 2| associated with each of the laterally disposed recesses H are swung outwardly to the position shown in Fig. 6 and the spring clips 24 are assembled thereon. When the spring clips 24 have been assembled on the flange 2|, the flanges 2| are swung into their recesses 28, thus projecting the anchoring feet 25, as disclosed in Fig. 5. The rear die section 5 is then moved to th right'as viewedl in Fig. 1 and the rear die section 6 is moved to the left as viewed in Fig. lluntil the portion of the rear die sections 5 and 6 just previously in association with'the front the sections dand 9 have been moved to the dotted line positions, as shown in Fig. 1. It will be understood that suitabl stops may be provided for limiting the movement of the die sections5 and G ineither direction. 7 With" the rear die sections 5 and 6 thus positioned in the recesses I having associated therewith the spring clips 24 .will be in alignment with the recesses ID of the front die sections 8 and 9. The die is then closed by moving the support and together with it the base 3 and rear die sections 5 and 6 into the relative position with respect to the front die sections 8 and 9 as shown in Fig. 2.

The recesses I8 and willnowbe in cavity formingrelation. It will be observed from inspection of Fig. 2 that the front plate 1 is provided with inclined guiding portions 21-.for facilitating the movement of the rear die sections 5 and 6 into cooperative relation with the front die sections 8 and 9. W

As soon" as the respective front and rear die sections have been moved together to bring the recesses l8 and Il into cavity'forming relation, with'the anchoringfeet 25 of the spring clips 24 projecting into the cavities thus formed, the metal delivery nozzle bearing against the seat I5 I 4 from which the moltenmetal 'is'co'ndu'c'ted operates with the rear die section 5 in a base'3 and front plate 1 as above described.

The rear die section 5jis provided with a plurality of cavities H and each is provided with a pivoted flange 2| for supporting spring clips 24 as above described. The front die section 35 is provided with a plurality of recesses 3|, which cooperate with the recesses II to provide molding cavities. The difference between the structure disclosed in Fig; 9; and that disclosed.

in the other figures of the drawings is the provision of male portions '32 and 33 adjacent the ends of the recesses 3| for filling in the ends of the recesses II and thus for foreshortening the molding cavities formed by the recesses may deliver molten metal "tothe spru'e openin and 3|. It=is to be understood that by providing a series of front die portions 38 having male portions 32 and 33 ofdifierent sizes, but all cooperating with the same rear die section 5, there may be provided molding cavities formed by the recesses H and 3| of different sizes, depending upon the sizes of male portions 32 and 33 on the front die section 30 which is used. Examples of front die portions 38 for providing different sized molding cavities areindicated by the dotted outline in Fig. 9 wherein the dotted outline A represents the outline of the recess M of the front die section Sand the dotted outline B represents theoutline of a recess 3| for providing an intermediate size molding cavity. As shown in the drawing the male portion 33 adjacent the gate l2 may be provided with a channel for extending the gate l2 to the foreshortened molding cavity. 7 r

.From the foregoing specification, it will be apparent that I have provided a die casting apparatus for casting wheel balance weights about anchoring feet of spring clips therefor.. It will be understood, however, that the invention is not limited to the die casting of balance weights on spring clips, but may apply to the casting of of objects, it will be apparent that the invention is equally applicableto the casting of a single object at a time.

Having thus described myinvention, what I I desire to secure by Letters Patent and claim is:

1. A mold for molding a balance weightabout 2,332,856: the anchoring foot of a spring clip therefor comcavity.

2.UA mold for molding abalance weight about theanchoring foot of a spring clip therefor, comprising two separable parts, said parts having op-; posed contacting faces,said faces having opposed recesses defining a molding cavity for receiving molten metal to be molded, a flange receiving recess in the face of one of said parts, said recess intersecting the one of said first named recesses insaid last named part, a flange pivoted in said flange receiving recess, said flange having a portion having a recess therein in alignment with the recess in said last named part, said flange being arranged to have sprung over said named portion thereof a spring clip having an anchorq means to! admitjmolten fmetal to the molding ing foot, said flange being arranged so as to project said anchoring foot into said cavity While said recesses are in cavity forming relation, said flange also being arranged to be swingable outwardly upon separation of said parts following molding to permit said clip together with the balance weight molded thereon to be removed therefrom, and means to admit molten metal to the molding cavity.

3. A mold for molding a balance weight about the anchoring foot of a spring clip therefor, com prising two separate parts, said parts having opposed contacting faces, a flange recessed into one of said faces, said flange being pivotally supported and swingable outwardly with respect to the face in which it is recessed, said faces having opposed recesses defining a molding cavity for receiving molten metal to be molded, said flange being arranged to receive thereon a spring clip having an anchoring foot, said flange being arranged to project the anchoring foot of the spring clip thereon into the cavity defined by said opposed recesses when said separable parts are disposedto place said recesses in cavity forming relation, whereby, said flange, when said separable parts are separated, may be swung outwardly to receive a spring clip and may be swung inwardly into the face in which it is supported and following molding may be swung outwardly to remove the spring clip and balance weight molded thereon, and means to admit molten metal to the molding cavity.

4. In a multi-part casting mold, a base, a rear portion axially movable with respect to said base, a front portion associated with said base, a recess in each of said front and rear portions, said recesses being so arranged as to provide a molding cavity when said rear portion is suitably axially positioned, for receiving molten metal to be cast, said rear portion being arranged to be moved with respect to said base to one side of said front portion prior to and subsequent to molding to have placed in the recess therein a member about which the molten metal is to be cast, and to have the casting removed therefrom, respectively, and

i 5.. In a mUlti-part casting mold, a base, .a rear portion axially movable with respect to said base, a front portion associated with said base, arecess: in-said front and rear portions, said recesses being so arranged as to provide a molding cavity when said rear portion is suitably axially positioned, for receiving molten metal to be cast, a

flange secured to said rear portion over which said recesses are in cavity forming, relation, said;

rear portion being arranged to be moved with re-, spect to said base to one side of said front portion prior to and subsequently to molding tohave secured to said flange the spring clip about the foot of which molten metal is to be cast and tohave the casting-removed from said flange, respectively, and means to admit molten metal to the molding cavity.

6. In a sectional casting mold, a rear section, a front section associated with said rear section, said front and rear sections having opposed faces, said sections being arranged so that they are movable in a direction normal to eachother to separate said faces, said faces having opposed recesses defining a molding cavity for receiving molten metal to be cast, means supported with respect to said rear section for supporting and projecting into said cavity an insert about which the molten metal is to be cast, said rear section having a lateral projection, said lateral projection having therein a recess and insert supporting means duplicating the first named recess and insert supporting means, said rear section being laterally movable with respect to said front section to place said second named recess and insert supporting means in said rear section into operative association with the recess in said front section, whereby while molten metal is beingcast tion of said casting, and means to admit molten metal to the molding cavity.

7. In a sectional casting mold, a base, a rear section axially slidable in said base, a front section, said sections having opposed faces, said sections being arranged so that they are movable in a direction normal to each other to separate said faces, a recess in each of said'front and rear sections, said recesses being arranged to provide a molding cavity when said rear section is suitably axially positioned for receiving molten metal to i be cast, said rear section having a laterally extending portion in which is disposed a recess which is a duplicate of the first named recess in said rear section, whereby by axially sliding said rear section with respect to said front section either one of said recesses in said rear section may be disposed in cavity forming relation with said recess in said front section, and an insert supporting means arranged with respect to each of the molding cavities formed by the recesses in said front and rear sections for projecting inserts into the molding cavities, and means to admit molten metal to the molding cavities.

p 8; The invention as definedinclaim 6 wherein a common sprue opening, whereby the rear sec-- tion may be laterally moved in opposite directions to permit simultaneous casting, and removal of previously formedcastings from the insert supporting means.

9. In a multi-part casting mold, a rear portion, a front portion associated with said rear portion, a recess in each of said front and rear portions, said recesses being so arranged as to provide a molding cavity when said front and rear portions are associated together for receiving molten metal to be cast, said front portion having adjacent at least one end of the recess thereof, a male member projecting into the recess of said rear portion for foreshortening the efiective length and rendering inoperative the com plement'ary end portion thereof.

10. The method of molding devices of the character described of different sizes which comprises providing a base die having a recess therein, and a plurality of auxiliary dies each having a recess therein of a different size for cooperating with said base die to provide a molding cavity and further providing said auxiliary dies with male portions at at least'one end of each of their recesses respectively for filling and rendering inoperative the complementary portion of the recess in the base die not opposing the auxiliary die recess and using a different auxiliary die for association with said base die each time a different size device of the character described :is to be molded.

HARRY J. KALAJIAN.

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