US2539543A - Extractor - Google Patents

Description

Jan. 30, 1951 F, 1 LEUTHNER 2,539,543

EXTRACTOR Filed March 5, 1949 INVENTOR FRANK J. I EUTHNER ingot molds.

Patented Jan. 30, 1951 UNITED STATES PATENT OFFICE EXTRACTOR FrankJ. Leuthner, Sharpsville, Pa.

Application March 3, 1949, Serial No. 79,385

(Cl. .Z2-93) 3 Claims.

This-invention relates to extractors, especially extractors for extracting cores from moldsr in foundry; work. It has to do with improvements in extractors which enhance their utility and improve their operati-ng characteristics.

Myinvention is applicable generally to the extraction` of coresfrom foundry molds in cases in whichta corelmay be pushed out of one end of a mold` or: flask by exerting pressure on the core at the opposite end of the mold or ask. I haveY developed the invention, in apparatus designed specincally for removing the cores from flasks after. makinghollowcastings such as ingot molds' and for purposes of explanation and illustration I shall describe the invention as embodied in an extractor for extracting cores from flasks in which ingot molds are cast.

Ingot molds. are cast in hollow generally tubular flasks in which are positioned cores for forming theingot cavities. When aningot mold is to, be cast the flask is setup, the core is introduced into. it in-proper position and molten metal is poured into the flask about the coreto form the ingot mold. The core may be collapsible orl noncollapsible as preferred although normallyv collapsible. cores are used inthe casting of Theinterior of thev llask and thev exterior oi the. core may beflined with sand before the molten metal is poured. After the casting has solidified the core is removed from thecasting and the casting is removed from the liask. In ingot mold casting it is` customary to employ elongated cores having pins projecting upwardly above the tops of the flasks, the ingot molds being cast in inverted position.

When an ingot mold has been cast. in appa-- ratus as above described as well known in the` art pressure isbrought to bear on the top ofthe pin which projects upwardly from the core and at the same time the flask is pulled upwardly so that the core is extracted downwardly out of the,

flask and casting. Extractors for thus extracting cores from flasks have been usedior very many years. A substantial number of patents have issued covering such extractors. is my ownPatent No. 1,881,055' which for present purposes may be taken as representative ofthe prior art.

A diiculty which has been encountered through the years with extractors of the type. shown in my said patent and in other prior patents is that. when the extractor has been lowered to the extent that itsv weight is partially carried by the core and the crane hook is further lowered, the extractor levers in addition to turn- One such patent..

ing down about the axes of theirrpivotal connections with the extractory also tend to flop sidewise,` carrying with them the chains and'. hooks which are to be connected under the ask flange.l But at precisely the same time'workmen areendeavoring to grasp the extractor hooks andthook them under the flask flange. The movement. of the extractor levers transversely of their'normal planes of operation is uncontrollable and does not follow any regular pattern, One time the levers may iiop one way andthe next time the opposite way.

The core pins of the various cores used in a foundry are of no uniform length andthe nonuniformity in the length of the core pins adds to the` uncertainty as to the paths which the extractor levers will follow in moving from their initial vertical position when rst lowered by the overhead crane to their generally horizontal position (see Figure l of my said patent) when the extractor hooks are hooked under the ask flange. The uncontrollable movement of the extractor levers has resulted in danger to the workmen whose duty it is to grasp the extractor hooks and'place them under the flask flange. Orl-many` occasions weirdand unpredictable movements of the extractor levers have resulted in portions of the extractor mechanism striking 'workmen on their heads or the upper portions of their bodies injuring them, sometimes seriously. This condition has existed for many years and has been.

recognized andv deplored bythose most highly skilled in the art, but prior to my present invention no solution has been found.

I have discovered how to obviate the undesirable uncontrollableY movement of the extractor levers and the danger incident to such move ment. Iv have discovered that the extractor levers should have a wide-r bearing span on the pivotY pins through which they are connected to the extractor pin. I preferably utilize extractor levershaving opposed spaced apart end portions embracing the portions vof the extractor pin to whichthey are respectively pivoted. Preferably each lever is made up of tvvospaced apart membersy whichu are suitably fastened), together by spacing andconnecting means so.r thatv theendspins. throughA which they arepivoted to the ex insurestractor pin than was the case with the old extractors which employed single rather than double levers. With my extractor construction the movement of the levers is relatively regular and uniform and the workman can grasp the extractor hooks and place them under the ask flange with relatively little danger of being injured by uncontrolled movement of the levers.

The differences in structure between my extractor and the extractors which have been used for generations are slight yet they are of fundamental importance because of the entirely different operating characteristics which they impart to the extractor. The results which are achieved by my new extractor have been sought for at least two generations to my knowledge but no one has conceived how to bring them about.

Other details, objects and advantages of the invention will become apparent as the following description of a present preferred embodiment thereof proceeds.

In the accompanying drawings I have shown a present preferred embodiment of the invention in which Figure l is a side elevational View of an extractor;

Figure 2 is a plan view of one of the double levers of the extractor;

Figure 3 is an elevational View of the double.

lever shown in Figure 2;

Figure 4 is an elevational view of the extractor pin; and

Figure 5 is a top plan view of the extractor pin.

Referring now more particularly to the drawings, the extractor pin comprises a cylindrical body portion 2 and a head 3 integral with the body portion 2 and having opposed laterally projecting single thickness ears 4. Each ear has a bore 5 therethrough. At opposite sides of the head 3 vertical projecting guides 6 are provided.

A centering member l cooperates with the extractor pin, the centering member having therein and extending upwardly from the bottom thereof a cylindrical cavity 8 of such cross-section as to receive the core pin and also the body portion 2 of the extractor pin may be of the same crosssection. At its bottom the centering member i has a base portion 9 adapted when the centering member is positioned over the core pin to rest upon the top of the casting in the flask. The centering member "I has opposed slots i9 open at the top for receiving the ears Il of the extractor pin and also has opposed grooves I I for receiving the guides 6 of the extractor pin. Two cross pins I2 bridge the top of the centering member 'I to keep the centering member from dropping away from the core pin, the cross pins I2 resting atop the body portion 3 of the core pin when the extractor is supported free of the core. When the extractor is lowered into operative position the core pin is received within the lower part of the cylindrical cavity 8 and the base portion 9 of the centering member 'I rests on the top of the casting. The extractor pin moves down within the cavity 8 until its bottom bears upon the top of the core pin. The centering member 'I may initially be placed over the core pin by hand and maintains the extractor pin in cooperative relationship with the core pin during use of the extractor.

Pivoted to each of the ears i of the core pin is a double lever I3 as shown in Figures 2 and 3. Each of the double levers I3 consists of two similar lever members I4 disposed in opposed spaced apart relation, being so maintained by spacers I5 suitably fastened between the lever members as by rivets Iii. Each double lever I3 has at each end opposed spaced apart end portions Il each having a hole I8 therein for receiving a pivot pin.

Each of the double levers I3 is positioned with one end in cooperative relationship with one of the ears l of. the extractor pin, the opposed spaced apart end portions I'I at one end of the double lever lying on opposite sides of the ear with the holes t3 coaxial with the hole 5 of the ear. A pivot pin I9 passes through the holes I3 and 5 and thus pivotally connects each double lever I3 to the extractor pin. The lever members I4 bear on the pivot pin I9 at points on opposite sides of the ear.

'Each of the double levers I 3 has holes 2D in its lever members I4 through which by a pivot pin 2| a link 22 is pivoted to the double lever. Each link 22 has its upper end disposed between the lever members I i and at its lower end has a vertically elongated slot 23 in which is disposed the saddle 24 of a hook 29 adapted to be positioned beneath the ask flange.

At the outer end of each lever i3 a link 26 has a portion disposed between the lever members I4 and pivoted thereto by pivot pin 21, chains 28 connecting the links 26 with a large ring 29 adapted to be disposed over the hook of an overhead crane.

When the extractor is to be used it is carried by the overhead crane with the crane hook passing through the ring 29 to a position above the flask containing the core and the ingot mold cast therein.' When the extractor is being carried to position the chains 28 and double levers I3 hang down vertically, the centering member 'I being supported by the extractor pin by the cross pins I2 which rest on the upper surface of the extractor pin. The extractor is lowered until the centering member 'I receives in its cavity 3 the upwardly projecting core pin. When the centering member l is in position its base portion 9 rests on the upper surface of the casting. Then as the extractor is lowered the bot-- tom of the extractor pin seats on the top of the core pin, after which part of the weight of the extractor is carried by the core as the crane hook continues its downward movement.

As the crane hook continues its downward movement the levers I3 swing downwardly sub-Y stantially in planes normal to the axes of the pivot pins I9 until the levers are in` generally horizontal position, at which time the hooks 25 are grasped by workmen who place them under the ask flange. The downward swinging movement of the double levers is comparatively regular and predictable and the levers do not flop sidewise as was the case with the single levers previously employed. The danger to the workmen is thus largely eliminated and the work facilitated.

When the hooks 25 have been hooked under the flask flange the crane hook is raised, resulting in pressing downwardly on the extractor pin and pulling upwardly on the hooks 25 until the core is stripped from the flask.

The relatively wide bearing of the double levers I3 on the pivot pins I9 appears to result in the improved operation as above described although I am not sure of the theory of action. Whatever the theory may be, it is a fact that my extractor does not have the disadvantages of the characteristics of regular and controlled movements eliminating the hazard to the workman which has previously always existed. My extractor also brings about more eicient operation as because of its relatively controlled and predictable movements it is much easier and quicker to use than the prior extractors.

While I have shown and described a presentpreferred embodiment of the invention it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied within the scope of the following claims.

I claim:

'1. An extractor comprising means for exerting downward pressure on a core, a centering device for :centering the first mentioned means with respect to the core, opposed levers each pivoted to the rst mentioned means for pivotal movement relatively thereto generally in a common vertical plane, means connected with the ends of the levers remote from the first mentioned means for raising said ends of the levers and lifting devices extending downwardly from the respective levers intermediate the ends thereof for exerting upward pressure on a ask surrounding the vcore when said ends of the levers are raised, the extractor being characterized by each of the lifting devices being an elongated depending link having its upper end pivoted directly to the lever with which it is connected for rotation relatively to the lever about a horizontal axis and having a hook connected directly with the depending link at its lower end, the hook having inwardly facing means adapted to hook under a portion of the flask.

2. An extractor comprising means for exerting downward pressure on a core, a centering device for centering the rst mentioned means with respect to the core, opposed levers each pivoted to the rst mentioned means for pivotal movement relatively thereto generally in a common vertical plane, means connected with the ends of the leversv remote from the rst mentioned means for Aspect to the core, opposed levers each pivoted to the rst mentioned means for pivotal movement relatively thereto generally in a common vertical plane, means connected with the ends of the levers remote from the first mentioned means for raising said ends of the levers and lifting devices extending downwardly from the respective levers -inter-mediate the ends thereof for exerting upward pressure on a flask surrounding the core when said ends of the levers are raised, the extractor being characterized by each of the opl posed levers being a double lever having opposed raising said ends of the levers and lifting devices extending downwardly from the respective levers intermediate the ends thereof for exerting upward pressure on a ask surrounding the core when said ends of the levers are raised, the Vextractor being characterized by each of the lifting devices being an elongated depending link havspaced apart elongated portions with spacing means therebetween and connected therewith and each of the lifting devices being an elongated depending link having its upper end disposed between the opposed spaced apart elongated portions of the double lever with which it is connected and pivoted directly thereto for rotation relatively to the lever about a horizontal axis and having a hook connected directly with the depending link at its lower end, the hook having inwardly facing means adapted to hook under a portion of the flask.

FRANK J. LEUTHNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTSI Number Name Date 996,661 Murray July 4, 1911 1,018,669 Leuthner et al Feb. 27, 1912 1,122,046 Tickner Dec. 22, 1914 1,415,451 Jones May 9,'1922 1,792,801 Black-well Feb. 17, 1931 1,881,055 Leuthner Oct. 4, 1932 2,345,391 Grossett Mar. 28, 1944

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