US2169885A

US2169885A - Casting apparatus

Info

Publication number: US2169885A
Application number: US215909A
Authority: US
Inventors: Jung Albert Henry
Original assignee: UNITED AMERICAN METALS CORP
Current assignee: UNITED AMERICAN METALS Corp
Priority date: 1938-06-25
Filing date: 1938-06-25
Publication date: 1939-08-15
Anticipated expiration: 1956-08-15

Description

Aug. 15, 1939. A. H. JUNG 2,169,885

; CASTING APPARATUS v Filed June 25, 1938 2 Sheets-Sheet 1 H fllllflnll l iiiiiiiflilii a??? I WIHIM 3 $2 mars Wang Aug. 15, 1939. JUNG 2,169,885

CASTING APPARATUS Filed June 25, 1958 2 Sheets-Sheet 2 a Patented Aug. 15, 1939 UNITED STATES PATENT or ies CASTING APPARATUS Application June 25, 1938, Serial No. 215,909

7 Claims.

This invention relates to casting apparatus and more particularly to a casting apparatus wherein means is provided for ejecting the material cast from the apparatus.

Prior to my invention various arrangements have been proposed to effect ejection of ingots from molds which have been costly to produce, short lived, and generally ineificient and unsatisfactory' For example, it has been proposed that molds including ejection apparatus be provided with cam means for effecting motion of such ejection apparatus. These arrangements have generally been short lived, requiring much service and attention, and found to be unsatisfactory for designs including cam operated ejection -mechanism, inevitably involve the setting up of stresses along lines at variance with the movement of the ejector elements in the mechanism which stresses make for excessive wear and if the apparatus incorporating such design is to last a reasonable time the parts of same must be fabricated of relatively heavy material which is costly.

Various other ejector mechanism have been proposed which have been found Wanting for other reasons including unsatisfactory operation in that the material cast was not always ejected properly unless a relatively great amount of force was exerted by the operator or operating motor which force after repeated operation of the machine, soon wrecked the same 'or the machine had of necessity to be made of excessively strong parts to resist the effects of these relatively greatforc'es, which resulted in an expensive design.

It is'an object of this invention to provide a mold mechanism including ejection apparatus of simple, inexpensive, though rugged design. It is a further object of the invention to provide a mold mechanism including ejection apparatus of the typeinvolving a minimum of stresses, resulting in lightness of parts, and the property of being long lived.

Other objects and the nature and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is a view in elevation of my mold apparatus with the front cover plate removed in cluding ejection mechanism;

Fig.2 is a fragmentary view in elevation with the ejector mechanism in a different position from that shown in Fig. 1;

Fig. 3 is a view in perspective of the apparatus with the frontcover plate in place; and,

Fig. 4 is a sectional view taken along lines 4'4 of Fig. 3 looking in the direction of the arrows.

Referring to the drawings, a back geared reversible motor i is associated in driving relation with the pulley H through the gear box i2 whereby rotation of the pulley l3 may be effected through the medium of V-belt l4. Directly connected to the pulley I3 is the shaft l5 having a series of left hand screw threads i6 and a series of right hand screw threads ll, respectively, formed thereon. The shaft l5 may. be suitably supported by the frame l8 carrying ball bearings l9 and 20, respectively, which tend to reduce frictional losses and within which the said shaft l5 rotates.

Fixed to the frame l8 at each end are the elements 2| to which are pivotally secured at 22 the links 23. Pivotally secured to the opposite ends 24 of the links 23 are the bars 25 which are further pivotally secured at their respective ends 26 to the nut like

elements

21 and 28, respectively, which are internally threaded to correspond with the left hand screw threads !6 and. the right hand screw threads I1, respectively. The opposite ends of the links 25 are pivotally secured by pins 29 to the ejector bar assembly which may comprise channel member 36 of a section of high radius gyration, ejector pins 3!, and mechanism 32 performing the dual function. of securing the pins 3! to the channel member and providing for adjustment of position of the pins with respect to the channel member. Secured to the upper portion of the frame !8, a mold proper 33 may comprise a series of cavities 34 having bores 35 formed therein through which the ejector pins 3! are adapted to pass and operate to loosen and eject castings therefrom.

Secured to the angle iron 36 of the frame l8 7 may be a pair of switch mechanisms 31 and 38- which are normally urged to closed circuit position but which are adapted to be operated to break the motor circuit and cause cessation of operation of the motor Ill by physical contact of the extending portion 39 of the nut like element 27 with the

operating levers

40 and 4| of the

switches

31 and 38, respectively.

The nut like

elements

21 and 28 may be provided with adjustable stop contact nuts 42 to prevent injury to the machine should the switch 38 fail to operate or for any other reason. To insure that the mold proper 33 be held in level position, which is essential to the casting process, level adjusting means 43 may be associated with the frame H3 at the lower four corners thereof.

A manually operated multiple switch S is provided on the frame l8 at a location convenient to the operator of the machine by means of which initiation of the operation of the motor In may be effected, after the mold 33 has been filled with the material to be cast, and after the material has sufficiently solidified, whereby the link 25 will take the position illustrated in Fig. 2, the shaft l being rotated effecting axial movement of the nut like element 21 in a direction tending to effect vertical straightening out of the said link 25, whereby the pin 29 always re mains directly above the pivot 22, though at increasing elevation, to effect movement of the ejector pins 3| to their upper position as illustrated in Fig. 2. Further movement of the pins 3| is prevented by movement of the operating lever 40 associated with the switch 3'! which effects opening of the said circuit. The castings having been ejected from the cavities of the mold 33, the operator may then effect such movement of the switch S to close the circuit to the motor in a manner whereby rotation of the operating motor It] in the opposite direction is effected and the nut like

elements

21 and 28 will move toward each other, bringing the pins 29 closer to the pivots 22 and the ejector pins 3| withdrawn to the position illustrated in Fig. l. The motor H], as has already been explained, is of the reversible type and its circuits are so associated with the multiple switch S as to effect rotation of the motor I!) in one direction when the switch S is in one position and opposite rotation thereof when the switch is in a second position. Further movement of the ejector pins 3| will be prevented by the opening of the circuit to the motor If! by physical contact of the extension 39 of the nut like element 27 with the operating lever 4| of the switch 38 which will open the said circuit. The switch 3'! is in that circuit of the motor Ill which effects its rotation in a direction to cause the ejector pins to move upwardly, and the switch 38 is in that circuit of the motor Ill which effects its rotation in a direction to cause lowering of the ejector pins. Both the

levers

40 and 4| associated with the

switch

31 and 38 respectively, are of the type that return to their normal closed position when the motor-like element 2'! is not in engagement therewith. The switch S being a multiple switch, one of its elements is in series with switch 3'2 and another in series with switch 38. The

switch

31 and 38 are normally closed, but may be opened automatically by the nut-like element 2?, whereas the switch S is illustrated as being manually operated. The cycle may again be repeated after the mold 33 has been filled with molten material and suflicient time elapsed for its solidification.

Referring to Fig. 3, the frame It! may comprise a pair of channel section legs 44, Z section corner members 45, cross pieces 56 associated with said corner members and adapted to be fabricated of a fiat sheet by being slit at 4'! whereby the portion 48 may be bent upwardly at right angles to the portion 49. A cover plate 5% is adapted to cover the sides of the frame and is held in place by bolts 5!. Cover plates 52 may be secured to the respective ends of the frame as illustrated in Fig. 3 to permit exposure of the working parts.

Referring to Figs. 1 and 4, a series of four angle irons 53 supported on cross members 54 are adapted to support the H beam 55 which extends from one end of the frame !8 to the other and which forms a base for the toggle mechanism already described which effects operation of the ejector pins to lift the solidified castings from the molds when desired.

While the shaft I5 is illustrated in Fig. 1 as being motivated by a belt driven mechanism, it is to be understood that it is within the scope of my invention that the said motor be directly connected to the said shaft l5 and a mounting may be so associated with the frame [8 as to support the motor in that position if such arrangement is preferred. It is further to be understood that conventional sprocket wheels, not shown, may be substituted for the pulleys l l and I3 and a roller chain substituted for the belt I4, without deviating from my invention.

In order to insure rapid cooling of the mold proper 33, water pipe connections W and W may be associated therewith whereby cooling Water may be circulated through the jacket incorporated in the mold proper 33 as shown, see Figs. 1 and 3.

It will be seen from the above that the invention comprises a mechanism inexpensive to manufacture and capable of effecting desired results with the operating parts so arranged as to set up a minimum of undesired stresses and to effect positive ejection of the castings from the mold in the manner and when desired.

It will be obvious to those skilled in the art that various changes may be made in this device without departing from the spirit of the invention and therefore the invention is not limited to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

I claim:

1. A casting apparatus including a mold and means for ejecting castings from said mold including an ejector clement, means for imparting toggle action leverage to said element comprising a toggle mechanism, motor means for effecting operation of said toggle mechanism, manual control means for forward operation of said motor means, means responsive to a predetermined position of said toggle mechanism for effecting cessation of operation of said motor means, manual control means for effecting reverse operation of said motor means, and means responsive to another predetermined position of said toggle mechanism for again effecting cessation of operation of said motor means.

2. A casting apparatus including a mold, a frame for supporting said mold, means for ejecting castings from said mold comprising a toggle mechanism, said toggle mechanism including a driven shaft, a rider associated with said shaft, said rider and said shaft each having formed thereon corresponding screw threads, a linkage arrangement pivotally associated with said rider and with said frame to effect straight line movement with toggle action leverage of a portion of said linkage, an ejector pin associated with said portion and with said mold, all of said ejector means being supported by said frame and therewithin, a motor arranged to drive said shaft, manual control means for forward operation of said motor, means responsive to a predetermined position of said ejector means for effecting cessation of operation of said motor, manual control means for effecting reverse operation of said motor, and means responsive to another predetermined position of said ejector means for again effecting cessation of operation of said motor means,

3. A casting apparatus including a mold, a frame for supporting said mold, an ejector mechanism associated with said mold and secured Within and supported by said frame, said mechanism comprising a rotatable shaft having a section formed with left hand screwlthreads and a section formed with right hand screvv'threads,

means for rotating said shaft, a rider associated with said left hand threads, a second rider associated with said right hand threads, an ejector bar, an ejector pin associated with said mold and secured to said bar in adjustable relation, thereto, a first linkage arrangement pivotally associated with said bar, said frame, and said first rider, a second linkage arrangement pivotally associated with said bar, said frame, and said second rider in a manner whereby a portion of each linkage arrangement which is pivotally associated with said bar is adapted to be limited to straight line movement.

4. A casting apparatus including a mold, said mold comprising a plurality of cavities, means for ejecting a casting from each of said cavities including an ejector pin, means for supporting said pin comprising a bar having a section of high radius of gyration, a linkage mechanism associated with said bar, a portion of which is adapted to be limited to straight line motion, said portion being pivotally secured to said bar, motor means for effecting operation of said linkage arportion of the other, a threaded rider in slidable engagement with said threaded shaft, one of said links being pivotally secured at one of its ends to said rider, the other of said links being pivotally secured at one of its ends to said frame, the sizes of the respective links and the positioning of the common pivot of the links being cooperatively related to effect movement of the free end of one of said links in a straight line in proportion to the motion of the rider, an ejector bar pivotally secured to the said free link end, said ejector bar being of a section having a high radius of gyraticn, an ejector pin secured to said ejector bar, and means for freely rotating said shaft and effecting movement of said ejector pin indirectly through the toggle mechanism. 4 7

6. A casting apparatus including a stationary mold, a rigid frame for supporting said mold in a horizontal position, means for ejecting castings from said mold including a plurality of ejector pins, means for moving said ejector pins including a toggle mechanism directly associated therewith and operative to continuously apply toggle leverage to said ejector pins, said toggle mechanism comprising a driving end and a driven end, said toggle mechanism including a relatively large link and a relatively small link, a first end of said small link being pivotally connected midway between the extremities of said large link, one end of said large link being drivingly associated with the ejector pins, the second end of said small link being pivotally connected to a motor means, the size of said small link corresponding to the distance between the common pivotal connection between the two links and either of the extremities of the large link whereby the horizontal straight line motion of said motor means will effect vertical straight line motion of said toggle.

7. In a casting apparatus,,a relatively heavy mold, relatively light ejector means, said relatively heavy mold being stationary, said relatively light ejector means being movable, single toggle means for moving said ejector means through a portion of said mold, said single toggle means being characterized by a driving end and a driven end, means for effecting movement of said driven end, said toggle means being further characterized by its capacity for effecting independent straight-line movement of its driven end, whereby castings may be ejected from said relatively heavy mold by relatively unguided and independent light mechanism.

ALBERT HENRY J UN G.