US1587900A

US1587900A - Process of making metal castings

Info

Publication number: US1587900A
Application number: US729499A
Authority: US
Inventors: Executor Elmer L Briggs
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-08-01
Filing date: 1924-08-01
Publication date: 1926-06-08
Anticipated expiration: 1943-06-08

Description

June 8 1926. 1,587,900

- D. CORDINO PROCESS OF MAKING METAL CASTINGS Filed August 1, 1924 H M f F 2 a w 63w u ti Patented June 8, 1926.

UNlTlZ retina" oFr cE.

OF DOMINICK CORDIITO, DECEASED PROCESS OF MAKING METAL CASTINGS.

Application filed August 1, 1824.

My invention relates to metal castings and to the methods ofmaking the sal ne, and consists of improvements upon the inventions described and claimed in the two Letters Patent or" the United States issued to me and dated and numbered respectively, lyloiifilitl, dated May 29, 19 t), and 1,456,869, dated My 29, 1928, and of certain novel devices and instrumentalities employed in the process of casting metals.

The objects of my invention, among other things, are to accomplish all the advantages or the inventions of my said two Letters Patent in a more efficient and economical manner and with more simple and inexperr' sive devices; some of the other objects are to provide a chapl'et oi novel construction. to cast lugs with openings therethrough and at any desired angle to the main body oi? the casting, and to form such lugs at a grea or variety of ele *ations above the main body oi? the casting than has heretofore been attainable.

As stated in the specification oi said two Letters Patent, it is well known that in fastening panels to stove doors, and in securing together fixtures of various kinds in gas and oil stoves and other castings for the purpose of concealing the it'astenings on the face of the work, it is customary to cast av lug or lugs on the inside of one casting and to drill and tap a screw threaded hole therein for the reception of a bolt or screw. These mes is are subject to a number of objections, and among them are: first. the danger of forcing the drill through the casting and thereby destroying or defacing it; secondly, of breaking the tap bynot judging thcdistance accurately and by driving it nst the bottom of the hole. In some situ. .ons it is awrward to use the drill. and tap beeiinse of diiilculty of access to the particular position or the lug, all of Which accentuates the risk of forcing the drill through the casting and breaking the tap, and also makes accurate drilling and tapping (lli'llclllli, it not impossible:

It is often necessary or desirable to have the lugs elevated above the pattern at'dit- :terent heights, either by raising the chaplet on a slight support or by setting it deeper into the patterinboth of which can be accomplished by this invention more conveniently and eliiciently than by any means heretofore employed.

Serial No. 729,499.

in the accompanying drawing illustrating some of the devices and instrumentalities employed by me in practicing my invention, Fig. 1 is a perspective View of an attachment to be secured to the pattern used in forming the mold for the casting; Fig". is a perspective View oi my improved chaplet to be incorporated into the casting during the molding process; Fig. 3 is a perspective View of the chaplet after the mold has been formed and is readyi or the pouring o:t= the metal; 4 is a perspective view ota lug having my chaplet cast therein, and Fig. 5 is a vertical section of the lug shown in Fig. a through the line Fig. 6 a perspective view of the chaplet supported at an angle on the pattern. Fig. 7 is a ing embodyingmy invention, having several lugs formed thereon.

Similar nuine s indicate corresponding parts throughout all the figures of the drawing.

In my present invention l dispense with the use ota nut, and make the chaplet of thin sheet metal and oi diil'erent form and of less metal than the chaplet shown in my said two Letters Patent. I have discovered that it is unnecessary cause a core in any portion of thechaplet in forming the mold for the casting as the sandwill' flow into the chaplet and till it When the mold is being formed with the exercise oi ordinary car and skill.

The first step in my improved process is to secure to the pattern one or more attachments 16 like that shown in Fig. 1, made o l? any suitable material. preferably brass the number and location of these dllijilx. 1-

ments being governed by the req AYlQIl-b oi the form of a particular cash {1. The

attachment 16 preferably has a depre ion 18, and is provided With a slit or narrow recess 13* on each side of the depression 13. The slits or narrow recesses 13 are adapted to receive the tree ends of the chaplet 9. fitting snugly therein, and the recesses l l are or suilicient depth so as to enclose the ends of the chaplet above the holes 9% 9. The provision of the depression 13 in the attachn'ient 16, makes it practicable to use a lug oi less height than heretofore, and still to avoid a contact between the end of the screw or bolt and the bottom of the lug.

Fig. 7 illustrates a casting 8 designed to have another casting or panel secured to it at the four points indicated by the lugs 19. In molding such a casting as 8, there would be four of the attachments 16 secured to the pattern in the same relation, of course, to each other as the lugs 19, on the casting shown in Fig. 7. Before making the mold, a chaplet K shown in Fig. 2, made of sheet metal or other suitable material, is inserted in each attaclnnent 16 on the pattern. The chaplet f) is preferably made of sheet iron, in the top of which a hole 18 is punched and the metal swaged into a tubular downwardly ex ending port-ion 12, which is screw threaded internally to receive the bolt 15 shown in Figs. 1 and 5.

The pattern with its attachments 16,-as many as may be required in a given instance, and each attachment containing a chaplet mounted upon it as described, is then placed in the molding sand in the usual manner for casting with the attachments 16 on the upper side of the pattern. In forming the mold the sand will fill the chaplet 9 and the depression in the attachment 16, and when the cope is raised from the drag, the chaplet 9 being light and loosely resting in the attachment 16, is lifted by the cope to which it adheres, carrying the sand which fills it and that which fills the depression 13 in the attachment 16. The pattern is then removed from the drag, the cope is closed and the metal is poured in the usual manner. By reason of the holes 9 in the chaplet 9, being closed by the attachment when the mold is being formed, they are free for the molten metal to enter during the casting with the result that lugs like the lugs 19, shown in Figs. 4 and 5, are cast in which the chaplet forms a bridge open on both sides and with sufficient space beneath it for the bolt or screw 15 to enter without the end coming in contact with the bottom of the lug after being turned down so as to tightly secure any c'astingto the lug which may be desired. It is obvious that any one of a variety of small perforations or openings in the ends of the chaplet through which the metal may flow, will accomplish the purpose of the

round holes

9, 9*.

Referring to the casting 8 in Fig. 7, or similar castings, it is understood that each of the lugs is to be constructed as above de scribed with a screw top to receive a screw or bolt 15 for the purpose of securing a casting or any other part thereto, as stated in the specification of my said two Letters Patent.

My invention is adapted to provide a lug upon a casting at any angle to the main body of the casting that may be desired. In forming a lug at any angle other than a right angle, it is necessary to employ certain modifications of the means above shown and described. Referring to Fig. 6, in the attachment 16 the recesses or slits 13 exthreaded hole 18 in its tend through the edges of the attachment. The stud 20, secured to or made a part of the pattern is provided to support the chaplet in the recesses 13 at the angle required for the lug to be cast. The recesses 13 are open through the edges of the attachment, so as to permit the chaplet to be lifted out of the attachment and to be withdrawn therefrom by the cope after the mold is formed. The stud 20, while located in front of the opening 14 on one side of the chaplet, is of such small dimensions as not to interfere with access to said opening for all practical purposes.

It is obvious that by this method of casting, the holes in the lugs are accurately located, that all danger of defacing the casting by accidentally drilling through it is obviated, and as no tapping of the thread is required, there can be no breakage of the taps. The screws or bolts employed are selected with reference to theirlength, so as not to extend to the bottom of the space 1% shown in Figs. 4 and 5. The screws or bolts are readily removed when occasion requires separation of the parts for repairs or other purposes.

It is evident that there is also an advan-' tage in this invention where it is necessary to provide a screw threaded hole in a casting in a'place inconvenient of access to a drill and tap.

The provision of the open space 1 1, through the lug, is of great importance in case it becomes necessary to remove the bolt or screw for the purpose of repair, for the reason that the'end of the screw or bolt is free from contact with the casting, is accessible from both sides of the lug, and does not become adhered thereto by reason of corrosion. Where no such space is provided it is then impossible to remove the bolt when desired without breaking it or destroying the casting or redrilling and retapping the lug.

In the construction shown in my said two Letters Patent, the chaplet is formed with a base portion, and is made of sheetmetal suf ficiently thick to provide for drilling and tapping a, screw thread in the top, or instead thereof a nut is employed in the upper part of the chaplet.

In the present invention the chaplets may be made of different thicknesses of sheet metal so as to adapt them to any desired purpose. No base portion is required for the chaplet and no core is needed. within the chaplet in practicing my invention. It is to be understood, of course, that the chaplet is buried in sand as shown in Fig. 3, after the mold is formed and before the metal is poured, and that only the extremities of the chaplet, where the

holes

9, 9 are formed, are uncovered and exposed to the molten metal in the casting process. By reason of the molten metal flowing around the free ends of the chaplet and through the holes 9, the chaplet becomes an inte ral part of the casting and forms a lug of great strength and security.

hat I claim and desire to secure by Let tors Patent is:

1. The hereinbcfore described process of casting metals, consisting first of inserting into the pattern an empty chaplet having a screw threaded hole in the top, then forming the mold and thereby filling the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a lug having an opening through the same.

2. The hereinbefore described process of casting metals, consisting first of inserting into the pattern an empty channel shaped chaplet having a screw threaded hole in the top, then forming the mold and thereby filling the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a lug having an opening through the same.

3. The hereinbefore described process of casting metals, consisting first of inserting into the pattern an empty channel shaped chaplet having perforationsin the extremities of the same, and having a screw threaded hole in the top, then forming the mold and thereby filling the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a lug having an opening through the same.

4:. The hereinbefore described process of casting metals, consisting first of inserting into the pattern an empty chaplet having a screw threaded hole in the top, said chaplet being located at an acute angle to the face of the pattern, then forming the mold and thereby filling the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a having an opening through the same.

5. The hereinbefore described process of casting metals, consisting first of inserting into the pattern an empty channel shaped chaplet having a screw threaded hole in tle top, said chaplet being located at an acute angle to the face of the pattern, then forming the mold and thereby filling the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a lug having an opening through the same, and said lug being located at an acute angle to the face of the casting.

6. The hereinbefore described process or casting metals, consisting first of inserting into the pattern an empty channel shaped chaplet having perforations in the extremities of the same, and having a screw threaded hole in the top, said chaplet being located at an acute angle to the face of the pattern, then forming the mold and thereby filling; the chaplet with sand, then removing the pattern and pouring the metal, whereby the casting is provided with a lug having an opening through the same and located at an acute angle to the face of the casting.

In testimony whereof I have hereunto set my hand this twelfth day of July, 192st.

DOMINICK CORDINO.