US3840065A

US3840065A - Apparatus for forming a cast hinge

Info

Publication number: US3840065A
Application number: US00365270A
Authority: US
Inventors: K Hannes
Original assignee: Coats and Clark Inc
Current assignee: Coats and Clark Inc
Priority date: 1971-10-07
Filing date: 1973-05-30
Publication date: 1974-10-08
Anticipated expiration: 1991-10-08

Abstract

A cast hinged article and the method and apparatus for simultaneously casting both parts of the article. A first part of the article is formed with inner projections, and a second part of the article is formed thereover to enclose the projections to provide a hinged pivot. A staking unit which includes a punch then distorts the material in the first part adjacent the projections so that the pivot will be freely movable.

Description

United States Patent 11 1 1111 3,840,065 Hannes i 1 Oct. 8, 1974 [54] APPARATUS FOR FORMING A CAST 2,819,494 l/l958 Morin 264 242 HINGE 3,187,072 6 1965 Morin 264 242 3,191,376 6/1965 Morin 164/90 X [75] Inventor: Karl Hannes, Whne P ums. NY. 3,456,913 7/1969 Lull 1. 264/242 x [73] Assignee: Coats & Clark Inc., New York,

N.Y. Primary ExaminerJ. Spencer Overholser [22] Filed May 30 1973 Assistant Examiner-John E. Roethel [2]] Appl. No.: 365,270

[57] ABSTRACT Related US. Application Data [63] Continuation-impart of Ser. No, 187,427, Oct. 7, A hmged amcle a the method and aPParatuS 1971 p NO- 3,742 555 for simultaneously casting both parts of the article. A

first part of the article is formed with inner projec- 521 US. Cl 164/303, 164/90, 264/242 tions, and a second p of the article is formed there- 51] Int. Cl B22d 19/12 Over to enclose the projections to Provide a hinged [58] Field of Search '164/90, 303; 264/242 A staking unit which includes a Punch then torts the material in the first part adjacent the projec- 5 References Cited tions so that the pivot will be freely movable.

UNTED STATES PATENTS 13 Claims, 18 Drawing Figures 2,577,350 l2/l95l Morin 164/90 X PATENTED 81974 3.840.085

SHEET HIF 4 APPARATUS FOR FORMING A CAST HINGE This application is a continuation-in-part of 'my copending application Ser. No. 187,427, filed Oct. 7, 1971, now US. Pat. No. 3,742,555.

BROAD STATEMENT OF INVENTION The present invention relates to an apparatus for casting the parts of a cast hinged article simultaneously to be pivotal on each other with the hinged pivot being treated to be freely movable.

DESCRIPTION OF THE PRIOR ART It is well known in the prior art to cast pivotal or hinged elements to form'an integral unit. An example of such casting is shown in US. Pat. No. 2,819,494 issued on Jan. 14, 1958 to Louis H. Morin. In such prior art casting a pivot was provided that would allow one element to be rotated withrespect to the other. However, in this type of casting where a second element is formed over a prior formed element, a degree of binding is present so that the relative movement of the two elements is not freely rotatable. In the aforementioned patent this is not necessarily a disadvantage since a belt buckle is the product involved. However, for other elements, such as a hinge, where this type of casting process is utilized, movement of the pivot free of binding is desired.

DESCRIPTION OF THE INVENTION The present invention provides an apparatus for producing a product having hinged elementswherein one element is treated to be freely movable with respect to the other element.

The invention further provides casting apparatus for producing articulated elements by forming a second element over a prior formed first element and providing staking means to distort the first element to free the articulated connection.

A further provision of the present invention is casting apparatus having relatively movable dies between which a first element having projections is formed and a second element is formed thereover on the projections to provide a pivotal hinge, and staking means are provided including a punch to distort the material in the first element to free the pivot.

There is also provided casting apparatus including movable dies to form a first element with projections and a second element cast thereover to form a pivot on the projections, and a separately located staking means has resiliently mounted parts to hold the element while a punch distorts the material of the projections to free the pivot.

A still further provision of the present invention'is to provide an apparatus for producing articulated elements between movable dies wherein one element is cast over another element to form a hinged area, and the connected elements are positioned between staking means that include opposed relatively movable parts that press against the elements so that a punch positioned in the opposing parts can be forced into the other element to spread the material and free the hinged area.

The invention further includes casting apparatus for forming the article described hereinabove. The casting apparatus includes relatively movable dies having matable molds in which the article is formed by casting a second element around a previously cast first element so as to be pivotally movable therewith and staking means are provided to be positioned on either side of the elements and including a punch to distort the material in one of the elements for free movement of the pivot. The staking means comprise opposed separate housings positioned on either side of the articulated element after it is moved between the housing. Each of the housings includes a relatively flat member that can be pressed against one side of the articulated article, and the other side of the member is pressed against biasing means to provide relative movement during the punching of the article. The punch slides within the housing and the biasing means and through one of the members. The end of the punch has a pair of parallel raised areas with curved surfaces to spread the material as explained above.

The nature of the present invention will become more clearly apparent and better understood from the following description and accompanying drawings, in which: 7 FIG. 1 is an elevational view of one side of the hinged article of the present invention showing the decorative formation thereon;

FIG. 2 is an elevational view of the other side of the hinged product showing the flat-sided formation and depressions formed therein;

FIG. 3 is a side view of the hinged product shown in FIGS. 1 and 2;

FIG. 4 illustrates the installation of the article shown in FIGS. l-3;

FIG. 5 is a view similar to FIG. 2 showing a lower element of the formed article in enlarged form;

FIG. 6 is a perspective view of an upper element of the formed article;

FIG. 7 is a diagrammatic view illustrating the apparatus and method for forming the article shown in FIGS.

FIG. '8 is an exploded perspective view of one opposed means that provides the distortion of the element shown in FIG. 5;

FIG. 9 is an exploded perspective view of another opposed means that provides the distortion of the lower element shown in FIG. 5;

FIG. 10 is a view of the opposed means shown in FIGS. 8 and 9 in assembled condition prior to contacting the formed article for a distortion step;

FIG. 11 is an elevational view of punch means located in the opposed means;

FIG. 12 is an end view of the punch means shown in FIG. 11;

FIG. 13 is a plan view of part of the punch means shown in FIG. 11; 5

FIG. 14 is a perspective view of part of the end of the punch means showing raised areas thereon;

FIG. 15 is an elevational view of a modification of the embodiment of FIG. 2;

FIG. 16 is an elevational, view of a modification of the embodiment of FIG. 5;

FIG. 17 is an elevational view of a further modification of the embodiment of FIG. 5; and

FIG. 18 is a cross sectional view of the embodiment of FIG. 17 taken along the lines XVIII XVIII.

It will be understood that the accompanying drawings are merely diagrammatic illustrations, and reference should be made to the following description for a more detailed explanation of the structure involved.

FIGS. 1-3 illustrate the articulated article of the present invention. The article 20 has a front decorative side 22 as shown in FIG. 1 and a rear flat side 24 as shown in FIG. 2. The article illustrated is a decorative hinge although it is to be understood that the invention is not to be so limited since the invention is considered to encompass any articulated element to be provided with a freely movable pivot. Front surface 22 of the hinge includes a decorative surface such as the illustrated embodiment of a fleur de lis pattern which includes part of the pattern formed as raised surfaces to provide the decorative effect which can be enhanced by polishing and finishing. Article 20 includes a first element or lower section 26 and a second element or upper section 28. Element 26 is connected with element 28 by a pivot or hinge means 30. As mentioned above, front surface 22 includes raised areas with central area 32 in lower element 26 and central area 34 in upper element 28 being the highest raised surfaces on the article.

Hinge means 30 is provided by a pair of projections 36 formed on an inside surface of lower element 26 as shown in FIG. and extending inwardly toward each other in opposed relation. Each projection 36 is tapered so that its cross-section is smallest at its remote end. Upper element 24 is formed with a pair of enclosures areas 38 as shown in FIG. 6 formed to fit respectively around the projections 36 to complete the hinge. FIG. 3 shows upper element 28 in solid lines where it is aligned with lower element 26 so that the entire hinged article is flat while the dotted line position of element 28 in FIG. 3 illustrates a pivoted position around hinge means 30.

A pair of spaced holes 40 are formed in lower element 26. The particular spacing, number and location of holes 40 is not a critical feature of the invention as long as these holes are sufficiently spaced apart to receive screws, nails or other fastening means for holding the article in place when installed. Similarly, a pair of spaced holes 42 are provided in the upper element 28 for the same purpose of receiving similar fastening means for installation. Although four holes are illustrated, it is to be understood that more or less than four holes could be utilized for fastening an article such as the decorative hinge illustrated to the structure where it is utilized.

FIG. 4 illustrates a typical installation of article 20 as a hinge for a container such as a jewelry box 44. A typical decorative hinge for this purpose would be approximately l-2 inches in length and the upper or larger element 28 would be attached to the top lid 46 of the box 44 while the lower or smaller element 26 would be attached to the back side 48 of the box 44. It is important that the pivot 30 provide a freely movable relationship between the elements so that top lid 46 does not bind and is easily rotated for opening and closing. The novel decorative hinge of the invention could also be used on louvered doors or cabinets or similar structures, and it is understood that the size and thickness of the hinge could be varied depending on the strength required and the size of the structure involved. Similarly, the decoration could be changed and other designs utilized as long as the freely movable pivot feature is present.

The freely movable feature of the pivot is provided by depression means 50 formed in the first element 26. As most clearly seen in FIG. 5, depression means 50 comprises a pair of spaced, parallel,

elongated depressions

52 and 54 that extend longitudinally in element 26 with each depression respectively aligned generally with a projection 36 and preferably normal to the pivotal axis, as illustrated.

Depressions

52 and 54 are formed by a punch or similar device being forced into element 26 to thereby spread the material in the area around each projection 36. Accordingly, it will be appreciated from a consideration of FIG. 5 that

depressions

52 and 54 provide a distortion of the material around each of projections 36 so that they will pivot freely within enclosures 38 of pivot hinge 30.

While the hinge member 26 as illustrated in FIGS. 2 and 5 is shown as being provided with two parallel depressions means 50, it will be apparent that the number, type and size of such depression means can be varied depending, for example, on the form of the hinge itself and the material of which the hinge is made. Thus, in a small hinge, it has been found to be more satisfactory to provide only a single depression centrally disposed in the hinge member 26, as shown in FIG. 16, the depression being normal to the pivotal axis of the hinge. A single such depression is thus preferable when the dimensions of the article are such that it would be more difficult to provide two such depressions aligned as shown in FIGS. 2 and 5. Furthennore, it is apparent that more than two parallel depression means may be provided if desired, for example, with larger size hinges, and also when the metallurgical characteristics or shape of the hinge structure limit the spreading that can be effected in a practical manner by only two such depressions.

In addition, while the depressions 50 illustrated in FIGS. 2 and 5 are shown as being spaced from the perimeter of the hinge member 26, this depiction of the depression means is not intended to be limiting, since if desired, the depression means may extend to the perimeter of the hinge member 26 as shown in FIG. 15, especially that perimeter toward the projections 36.

In addition, it is to be pointed out that the deformation of the hinge member 26 to effect the spreading of the projections 36 may be effected by punching or compressing the central or bridge portion of the hinge member over a larger area 191, as shown in FIGS. 17 and 18, in which case discreet depression lines such as the depression means 50 may not appear. In the illustration of FIGS. 17 and 18 the depression 191 is in exaggerated form and thus in an actual structure the depression may be only barely visible. For example, a large punch may be employed to effect the general spreading of the material in the central portion of the hinge member coextensive with the region aligned with the projections 36 and the region therebetween. A die member for effecting such spreading may, if desired, be smoothly rounded whereby a general concavity is produced in the hinge member 26 instead of the discreet linear depression means as illustrated in FIGS. 2 and 5.

The casting apparatus of the invention is shown schematically in FIG. 7 where the dotted outline 60 represents one side of a pair of movable dies within which

elements

26 and 28 are formed. The general procedure of forming a first element, then moving such element to the next cavity and forming another element in articulated relation therewith is shown in the aforementioned US. Pat. No. 2,819,494. This is provided by having die 60 and a mating die relatively movable toward and away from each other to allow the vertical movement of the elements being formed in sequential steps. During the formation heated material from an injection nozzle (not shown) flows into a gate 62 in the direction shown by arrow A. The heated material flows around a transfer core pin 64 to form a ring-like upper gate portion 66 and a lower gate portion68. It is to be appreciated that this is a known feature to flow the heated metal into molds formed in mating dies to simultaneously form upper and lower elements in articulated form. In the upper part of the die 60 the gate 66 is seen to include

paths

70 and 72 arranged to direct separate flows obliquely with respect to each other to completely form one lower element 26. Simultaneously with the flow into gate 66 there is also a flow into lower gate 68 to form the upper or second element 28 in articulated condition with a previously formed lower element that has been transposed downwardly. This is provided by flow paths 74 and 76 located obliquely with respect to each other to disperse the heated material throughout the mold in forming element 28. The articulated formation is correlated with opening and closing of the dies so that just prior to this material flowing step, the movable dies had been separated and the transfer core pin 64 had moved the previously formed element 26 down to the lower position where it is shown in FIG. 7 as element 26. Accordingly, it is to be understood that each time the heated material flows into gate 62 and through

portions

66 and 68 into the molds, a first or lower element 26 is formed in the upper position and a completed hinged article is formed in the lower position by element 28 being cast with its lower enclosure portions 38 molded around solidified projections 36.

It will also be seen in FIG. 7 that when first element 26 representing the lower half of the hinged article has moved downward to where it appears as a solidified element 26, then

gate elements

62, 66 and 68 appear as solidified

gate elements

62, 66' and 68.

It will further be appreciated from an examination of FIG. 7 that when element 26 moves to its first lower position where it appears as solidified element 26 that an element 28 that had been previously formed their moves to a further lower or staking position where it appears as solidified element 28 where it is seen to be in articulated connection with a solidified first element 26" that had been previously formed and moved downwardly to the staking position.

The staking step is an important feature of the present invention, and the staking location is located directly below movable die 60 so that the articulated

elements

26, 28 in solid form that form a completed hinged article are moved downwardly thereto by the intermittent vertical movement of the transfer core pin 64. The staking step is for the purpose of treating the first or lower element now indicated as element 26" so that its projections 36 will be freed from binding within the enclosures 38 located in element 28'.- It is in this staking location that element 26" is subjected to a staking or punching deformation of the material in the central area of the element toform the depression means 50. The type of material that is supplied in the heated form to be solidified is a zinc alloy which is known as Zamak No. 3. I-Iowever,'the invention is not to be considered to be limited to a zinc alloy, as any material of similar nature can be used which is capable'of being melted and. injected in the flowable form to be solidified in the mating molds.

The staking or punch operation will now be described, and it is to be noted that the staking location is just below and closely adjacent to'the forming molds so that the solidified elements 26" and 28' are still in a heated condition allowing the depressions and spreading of the metal to be easily performed.

FIGS. 8 and 9 illustrate the elements that form the staking unit which are positioned in opposed relation as shown in FIG. 10. The hinged article shown as elements 26" and 28' that is to be staked or punched is moved into the lower position as shown in FIG. 10 between opposed units and 82 that are movable toward each other to respectively contact either side of the solidified hinged article. Element 80 is shown on the left side of FIG. 10 and would be movable toward the right by means not shown to be placed in contact throughout front surface 22 of hinged elements 26", 28' which includes the decorative ornamentation. For this purpose opposed unit 80 includes an outer cover or housing 84 which includes horizontally spaced-

parallel bores

86 and 88 for including therein stiff compression springs 90 and 92, respectively. The right-hand surface of housing 80 that includes the

bore openings

86 and 88 is formed with a notched or depressed area 94 that is oblong in shapeas shown in FIG. 7 to include the openings of bores 86'and 88 and be substantially of the same size as the hinged article 20. Within the notched area 94 is fitted one end 96 of a trim punch 100 which includes a raised portion 102 on its other end that is substantially of the same size and shape as the front surface of hinged element 20. From a consideration of FIG. 8 it will be seen that the trim punch 100 includes the oblong shaped end portion 96 that fits within slot 94, a section 104 that extends from end 96 and has a similar but slightly smaller oblong shape with its top surface aligned with the top surface of end portion 96, the raised portion 102 which includes upper and

lower parts

106 and 108 of generally the same configuration as the entire front surface 22, and a recessed groove 110 for receiving the projecting hinged area 30 of the hinged product 26", 28'.

An end cover 112 fits around portion 104 to enclose trim punch 100 in place on housing 84. Cover 112 includes an oblong opening 114 that is approximately the same size as the oblong portion 104 so that it fits therearound so that part of a back surface of cover 112 is pressed against a flat surface 103 which is the front surface of end 96 that contacts an extended portion 104. Cover 112 and housing 84 have a generally rectangular shape although this is not an essential feature of the invention. Cover 112 further includes a depressed area 116 in the form of three connected legs shaped to receive the solidified gates 62', 66' and 68' when they have been moved into the staking location. Accordingly, depression 116 has generally the same shape as the gate portions shown in FIG. 7 and the trimming of the gate portions from the hinged product 26", 28' is

springs

130 and 132 are respectively located. On the surface of housing facing hinged product 26", 28' a recessed area 134 is formed which is oblong in shape and substantially of the same size as the hinged product 26", 28' and further includes the

openings

126 and 128 as shown in FIG. 9.

A second contacting part of trim pad 140 is provided which includes an end 142 of such oblong size that fits within recessed area 134. Trim pad 140 is seen in FIG. 9 to include the oblong end section 142, and a raised portion 144 is formed thereon in a shape of generally the same size and corresponding to the shape of the hinged product. The surface of portion 144 is positioned to contact the back surface of the hinged product and is generally flat to correspond with surface 24 shown in FIG. 2. It will be noticed in FIG. 9 that the top surface of raised area 144 is generally in line with the top surface of end 142, but end 142 extends further downwardly than area 144 in order to receive a cover on a flat surface 146 that is formed on a front side of end 142.

A cover 150 fits around trim pad 140 and against the inner surface of housing 120. Cover 150 includes a centrally located cut-out portion 152 that extends into the upper surface of cover 150 to form a notched opening 156 to accommodate the upper tip of hinged product 26", 28 in the position shown in FIG. 9. Cover 150 also includes a depression 154 that is in the general shape of the gate portions 62', 66' and 68'. It is to be understood that depression 154 corresponds in opposing location and shape with depression 116 to enclose the gate portions to provide for trimming and removal thereof from the cast product.

It will be noted in FIGS. 9 and that an opening 156 is provided in the lower part of trim pad 140. A corresponding opening 158 is formed in the rear of housing 120 so that a punch 160 can be slidably positioned therein as shown in FIG. 10. It will be noted that punch 160 as well as housing 120 and cover 150 have a generally rectangular shape, but this is not a critical feature of the invention.

The function of punch 160 is to provide the staking operation wherein the punch is acted upon at one end by means not shown which would pass opening 158. The other end of punch 160 is thereby driven into the back of element 26" to form depressions 50 as described hereinbefore to spread the material and free the pivot.

As seen in FIGS. 11-14 punch 160 is an elongated member with a generally square shape in cross section and includes chamfered edges 162 along its elongated edges. Punch 160 has an end 164 that is forced into the lower element of product 20. End 164 includes a pair of parallel raised areas 166, and the punch and raised areas are formed of a material sufficiently hard, such as hardened tool steel, to press into the lower element 26" without deformation of the punch or raised areas. As mentioned previously, the forcing of raised areas 166 into the lower element is facilitated since the product is still in the heated condition from the molding operation.

Each raised area 166 has a particular configuration to facilitate entry and spreading of the material in order to free projections 36 from enclosures 38. As most clearly seen in FIG. 14, each raised area 166 includes an inner surface projecting perpendicularly from the end 164 of punch 160. Surface 168 extends on the order of 0.02 inches and then is curved outwardly to form a curved surface 170 terminating adjacent the respective chamfered edges and outer side of the punch. The radius of the curved surface 170 is approximately 0.05 inches measured from the outer edge of surface 168. It is an important feature of the invention to have curved surfaces 170 so that the penetration by raised areas 166 is first achieved along the outer edges I72, and the continued penetrating movement of the punch causes the material to spread outwardly because of the curved surface 170. The spacing of each raised area 166 from each other is not a critical feature of the invention as long as such spacing is in general alignment with the particular location of the projections 36 so that the spreading of the alloy material is effective to move the projections into freely pivotal movement with respect to enclosures 38. The actual spread or deformation of the material is about 7-10 mils.

When the contact is made by opposed units and 82 being pressed against the opposite side of hinged product 26", 28, punch 160 is driven by the means not shown so that the raised areas 166 are forced into the back of lower element 26" to spread the material and provide the free pivotal motion. With this driving or staking step the

springs

90, 92 and 130, 132 provide a resilient support for the contacting parts and so that a small amount of movement or give" is permitted with respect to

parts

100 and 140.

While the punch as illustrated in FIGS. 11-14 is provided with two raised areas 166 for spreading of the material in the hinge member, it will be apparent that the punch may be provided with any number of projections depending upon the design of the hinge as above discussed. For example, when a single depression means is to be provided in the hinge member 26, as shown in FIG. 16, the punch will of course then be provided with a single projection, the sides of the projection being shaped to effect the spreading of the material in opposite directions, for example with curved surfaces as illustrated in the outward sides of the projections 166 in FIGS. 13 and 14. Similarly, when the spreading of the projections 36 is to be effected by a larger area punch, to provide the modification of FIGS. 17 and 18, the punch may have a generally convex cross section to effect the general movement of the material from the center of the hinge member without the forming of a discreet depression mark. The invention thus contemplates the compression or punching of the central portion of the hinge member whereby material in the central portion or bridge area of the hinge member 26 is outwardly forced to effect the spreading of the projections 36. It will further be apparent that the invention also encompasses spreading of the hinge memher in the event that the hinge is formed with the projections and enclosure areas in opposite relative positions as compared with the hinge shown in FIGS. 2, 5, and 6, i.e., with outwardly extending projections on the hinge member 28 replacing the enclosure areas 38 and adapted to mate with enclosure areas on the hinge member 26 replacing the projections 36.

From the above description it is clear that the present invention discloses a novel articulated or hinged element wherein one element has depressions formed therein to spread the projections forming the hinge for free movement.

Another feature of the present invention is the provision of the casting apparatus for the articulated elements which includes staking or punch means that provides opposed units for contacting the articulated elements so that the punch can cause the distortion or spreading of the material for the freeing of the pivot.

A further feature of the present invention is the method of casting the article whereby the articulated elements are moved into the staking position, and the punch means are driven into one of the elements to spread the material for the loosening and free movement of the pivot.

It will be understood that various changes and modifications may be made by those skilled in the art in the particular features of the article, apparatus and method which has been described above for illustrative purposes without departing from the scope of the invention as defined by the following claims.

What is claimed is:

1. Casting apparatus for producing an article having first and second articulated elements pivotable together, comprising a pair of relatively movable dies including matable molds for producing said article,

said dies having a first cavity for forming said first element and a second cavity for forming said second element in combination with a previously formed first element,

a transfer core element mounted for movement within said dies; gating means associated with said core element to provide passages through said dies for delivering solidifiable material to form one each of said elements in said cavities in vertical alignment adjacent said core element, whereby said second element may be formed in an articulated arrangement with a previously formed first element;

staking means located below said dies, whereby said articulated elements may be movable by movement of said core element into alignment with said staking means;

said staking means comprising a pair of relatively movable opposing means respectively positioned on either side of said articulated elements;

said opposing means being movable toward each other to thereby contact both sides of said articulated elements positioned therebetween; and

one of said opposing means including punch means actuable to distort the solidified material in one of said elements for freeing said articulated elements for loose pivotal movement.

2. Casting apparatus according to claim 1 in which said gating means comprises a plurality of passages formed in said dies and leading around said core element to said mold to transport the solidifiable material in its molten state, said passages having ring-shaped material formed therein by the solidification, and said opposing means each having a depressed area formed therein to receive said ring-shaped material.

3. Casting apparatus according to claim 1 in which said molds form said first element as a lower part of a hinge and form said second elementas an upper part of the hinge with the hinge having front and rear surfaces, and one of said opposing means faces the front surface of the hinge and includes a first contacting part adapted to contact the front surface, said first contacting part having substantially the same shape as the front surface.

4. Casting apparatus according to claim 3 in which said first contacting part includes a cut-out area for receiving the pivot part of the hinge. I

5. Casting apparatus according to claim 3 in which said one opposing means includes a first housing and a first cover portion which fits around said first contacting part at the end of said housing facing the-front surface.

6. Casting apparatus according to claim 5 in which said housing includes spring means exerting a bias force on said contacting part toward the hinge.

7. Casting apparatus according to claim 3 in which the other opposing means includes a second contacting part having substantially the same shape as the rear surface of the hinge and adapted to contact the rear surface.

8. Casting apparatus according to claim 7 in which said other opposing means includes a second housing and a second cover portion which fits around said second contacting part at the end of said second housing facing the rear surface of the hinge.

9. Casting apparatus according to claim 8 in which said second housingincludes spring means exerting a bias force on said second contacting part toward the hinge.

10. Casting apparatus according to claim 8 in which an opening is formed in said second contacting part, and said punch means is slidable through said second housing and through said opening to contact the rear surface of the hinge.

11. Casting apparatus according to claim 1 in which said punch means comprises an elongated member having at least one raised area on one end to contact said first element.

12. Casting apparatus according to claim 1 in which said punch means comprises an elongated member having a pair of parallel raised areas on one end to contact said first element.

13. Casting apparatus according to claim 12 in which each said raised area is formed with an inner surface perpendicular to the end of said elongated member, and the top edge of said inner surface extends outwardly and downwardly in an arc to terminate along an outer area on said end of said member.

Claims

1. Casting apparatus for producing an article having first and second articulated elements pivotable together, comprising a pair of relatively movable dies including matable molds for producing said article, said dies having a first cavity for forming said first element and a second cavity for forming said second element in combination with a previously formed first element, a transfer core element mounted for movement within said dies; gating means associated with said core element to provide passages through said dies for delivering solidifiable material to form one each of said elements in said cavities in vertical alignment adjacent said core element, whereby said second element may be formed in an articulated arrangement with a previously formed first element; staking means located below said dies, whereby said articulated elements may be movable by movement of said core element into alignment with said staking means; said staking means comprising a pair of relatively movable opposing means respectively positioned on either side of said articulated elements; said opposing means being movable toward each other to thereby contact both sides of said articulated elements positioned therebetween; and one of said opposing means including punch means actuable to distort the solidified material in one of said elements for freeing said articulated elements for loose pivotal movement.

3. Casting apparatus according to claim 1 in which said molds form said first element as a lower part of a hinge and form said second element as an upper part of the hinge with the hinge having front and rear surfaces, and one of said opposing means faces the front surface of the hinge and includes a first contacting part adapted to contact the front surface, said first contacting part having substantially the same shape as the front surface.

4. Casting apparatus according to claim 3 in which said first contacting part includes a cut-out area for receiving the pivot part of the hinge.

5. Casting apparatus according to claim 3 in which said one opposing means includes a first housing and a first cover portion which fits around said first contacting part at the end of said housing facing the front surface.

9. Casting apparatus according to claim 8 in which said second housing includes spring means exerting a bias force on said second contacting part toward the hinge.