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Fe. 15, 193. v, TQBIA 2,398,457 APPARATUS FOR AUTOMATICALLY FEEDING METAL PIGS Filed Dec. 4, 1935 8 Sheets-‘Sheet 1 v. TOBIA , 108,457 APPARATUS FOR AUTOMATICALLY vFEEDING METAL 'PEEGS Filed Dec. 4, 1935 ' 8 Sheets-Sheet 2 1:4 60 J5. J9 2a: J6 F?b I if? lg3o ' _ V_ TOBlA ‘ , APPARATUS FOR‘ AUTOMATICALLY FEEDING METAL PIGS Filed Dec. 4, 1935 16 i l 2,108,457 -Q/M IHIII ' I Q : 8 Sheets-Sheet‘ 3 —21 Q» am @7 WWMDQQWWL» mm W Feb. R, E93. v. TOBIA 2»1@»457 APPARATUS FOR’ AUTOMATICALLY FEEDING METAL PIGS Filed Dec. 4, 1935 j, . a ' (3,9 8 Sheets-Sheet 4 Feb. 15, W38. v. TOBIA 2, 110%,457 APPARATUS FOR AUTOMATICALLY FEEDING METAL FIGS Filed Dec. 4, 1955 %\ 8 Sheets-Sheet Fe. 1, 393. I v. TOBIA 2, WAS? APPARATUS FOR AUTOMATICALLY FEEDING METAL PIGS Fiied Dec. 4, 1955 » ‘I’ 6’ ‘ W7 w a’ 3%’ 100 " xwmgmz . 9 97 a Sheets-Sheet e w 59,13 9% §2 37 N ‘ ' I , - “t3 avv _ v 66 E9 72 74 70,-; 49 ' i ‘ Feb. 1, 193. ‘v. TOBHA 52,10,457 APPARATUS FOR AUTOMATICALLY FEEDING METAL PIGS Filed Dec. 4, 1955 8 Sheets-Sheet 7 _____ga igyzz 164 / 215 1/99 6% J93 1575 j"! I N VE N TOR Vmcem‘ 760/61 II T TORNE Y5 Feb. 15, was, - v, TOBIA 2,308,457 APPARATUS FOR AUTOMATICALLY FEEDING METAL PIGS Filed Dec. 4, 1935 /27 1%?‘ 1232 8 Sheets-Sheet 8 Patented Feb. 15, 1938 2,1t8,457 UNITED’ STATES PATENT OFFICE 2,108,457 APPARATUS FOR AUTOMATICALLY FEED ING METAL PIGS Vincent Tobia, Chandlers Ford, England, assign or to Pirelli-General Cable Works Limited, London, England, a British Company Application December 4, 1935, Serial No. 52,795 In Great Britain December 8, 1934 16 Claims. (Cl. 198-35) The present invention relates to apparatus ‘for as to rotate together. In this casethere is pro automatically feeding metal pigs to a melting pot vided a number of cradles each serving to lift a layer of pigs and constituted by two ‘members, and is particularly, although not necessarily ex clusively, applicable for feeding lead or lead alloy one on each of the chains, and pivoted thereto 5_ pigs to the melting pot of an extrusion machine. It is customary to store the pigs in groups com prising layers, each containing the same number so as to- be capable of swinging toward or away from each other for the purpose of engaging or releasing a layer of pigs. In an alternative con of pigs, but those in each layer being disposed at right angles to those in the layers immediately struction, there is a single cradle only arranged to travel upwardly with a single layer of pigs, to 10 above and below. In the case of lead or lead deposit them on to the delivery device and then 10 alloy pigs, it is common to store them in groups to return by the same path fora second layer. of twenty-?ve, comprising ?ve layers of live pigs > In either of the above constructions, since, as above mentioned, the pigs in each layer extend in a direction at right angles to those in the layers above and below, it is necessary that, after 15 each layer has been lifted by the elevator, the group of pigs shall be rotated through a right angle about the vertical axis in order that, when the time comes for lifting the next layer, the pigs therein shall extend in the correct direction 20 for engagement by the cradle. Accordingly, mechanism, automatically operated in sequence with the conveyor and elevator, is provided for periodically rotating the table which, for the time being, ‘is in position for co-operation with the ele 25. each. It is, however, desirable to feed the pigs into the melting pot one at a time at regular 15, intervals, the chief advantages accruing being that the variation in temperature of the molten metal in the pot due to the introduction of the solid pigs is minimized, and this is also the case in respect of the level of the molten metal, with 2O the result that the sides of the melting pot are not subjected to the action of the dross, which forms on the surface of the molten metal and which becomes attached to the walls of the pot at, that surface, to the same degree as is the case 2 if there be considerable variation in level. A further advantage lies in the fact that, when using alloys, the maintenance of the correct pro portion of the constituents in- the melting pot is vator. "In, order that the invention may be clearly' understood and readily carried into‘ effect, it will facilitated if the pigs are fed in at a uniform rate now be described more fully with reference to with the resultant minimization of temperature variation. The present invention has for its main object to facilitate the handling of the pigs in groups as above described and theirfeeding into the melting pot one by one at regular inter wherein: Figure l is a side elevation of one form of ap vals. 4 The invention consists in apparatus comprising a travelling belt or like conveyor on which the groups of pigs may be placed and a co-operating elevator having one or more cradles adapted to 40 lift the pigs‘ one layer at a time and to deliver them on to a delivery device, such as a chute or. roller platform, provided with means for ,de taining the pigs constituting the layer and re leasing them one by one at regular intervals into 45 the melting pot. For the purpose of supporting the groups of pigs, the travelling belt, arranged so that its upper operative length is substantially horizontal, is ?tted with a series of revoluble tables, each of a size and shape suitable to re 50 ceive one group of pigs. The elevator with which the travelling belt co~operates may be constituted by two- chains passed over upper and lower pairs of sprocket wheels, the rising and falling por tions of the chains being substantially vertical 55, and the wheels ineach pair being connected so the- accompanying drawings which illustrate two forms of apparatus in accordance therewith and paratus comprising conveyor and elevator units, certain gear-wheels being shown in chain-dotted 35 lines only in order to avoid obscuring parts lying behind them, Figure 2 is a side view of the elevator unit to an enlarged scale, ' vFigure 3 is a section on the line A—A of Fig ure 1‘ to the scale employed in Figure 2, .Figure 4. is a partial section on the line A-A ofFigure 1V to a still further enlarged scale, .Figure 5 is a plan View of a detail on the line B'—-B of Figure 4, 45 Figure 6 is a side elevation of a modi?ed form of apparatus, ' Figures '7 and._8 are respectively side view and plan of certain details of the modi?ed apparatus illustrated in Figure 6, but to a larger scale, cer 50 tain other features being omitted or shown chain dotted'for the sake of clearness, Figure 9 is an end elevation of a portion of the elevator‘ unit shown in Figure 6 seen from the right-hand, side, 55 2 2,108,457 Figure 10 is a similar view as seen from the left-hand side. Figures 11 and 12, together constituting a single diagram, illustrate the electrical circuits of the apparatus described with reference to Figures 6 to 10. Referring to Figures 1 to 5, the metal pigs I, normally stacked in groups of ?ve layers, each layer comprising ?ve pigs as shown, are sup 10 ported on a series of tables 2, each rotatable about an axis at right angles to its surface. In Figure 1 six of such tables are shown, but it is to be understood that any number may be em ployed and, in fact, in Figure 4 a further table is 15 shown in the inverted position which each table occupies in succession in the manner described below. Each of the rotatable tables 2 is sup ported by means of a ball race 3 from a non-ro tatable frame 4, connected by means of lugs 5 20 with two endless conveyor chains 6 passed around pairs of sprocket wheels ‘I and 8 located respec tively at opposite ends of the apparatus, 50 that the portions of the conveyor chain 6 lying be tween them extend in substantially horizontal di rections. The weight of the tables 2 and their at opposite ends of each of the metal pigs I, whereby, as clearly appears from Figure 3, each cradle on its upward travel is adapted to lift a layer of metal pigs. By mechanism described below each pair of swinging members 22 is caused 10 to lift the layer of pigs I which, for the time being, is uppermost in its group, to carry it over the highest position to which the chain I8 travels around the sprocket wheel 20 and then to begin lowering the layer of metal pigs until the latter 15 come into contact with a delivery device consist ing of an inclined platform comprising a series of rollers 26 on which the pigs are deposited. In order that, when the chains I9 pass over the up pigs I which may be placed on the tables is taken per portion of the sprocket 29 the cradles shall 20 remain in their depending position, each of the pivots 23 is itself pivoted at 2 ‘I in such a direction as to permit the corresponding member 22 to swing in a plane parallel to that of either chain I9. Thus the extensions 24 engaging the lugs 25 25 remain substantially horizontal and serve to sup port the metal pigs I until the latter make con by channel guides 9 and I0 extending respective tact with and are borne by the rollers 26. After ly over the length of the conveyor unit, and with which rollers II, carried by the frames 4 and ex tending laterally therefrom, are adapted to co operate. The groups of metal pigs I are loaded on to their respective tables 2 when each of the thus discharging the metal pigs, the cradles continue their downward motion until, having 30 passed around the lower sprocket wheel 2!, each supporting frame 4 as Well as of the groups of latter is near the right-hand end of the conveyor unit, as seen in Figure 1: the tables are then caused to travel to the left toward the elevator unit under which each group of pigs remains stationary for a su?icient period to allow the pigs to be dealt with by the elevator unit in the man 40 ner described below. In order to secure the necessary periodic mo tion of the conveyor unit, the sprocket wheels 8 are driven from a continuously running shaft I2 which, as described below, also serves to drive the . elevator; on the shaft I2 there is a pinion l3 meshing with a gear wheel I4 mounted on a spindle I5. Fast on the spindle I5 there is also a toothed segment I6 which gears with a toothed wheel IT on the spindle I8 of the sprocket wheels 50 pivots being, as clearly seen in Figure 3, so lo cated as to enable the members 22 to swing to ward or away from each other. The members 22 are provided with inwardly directed extensions 24 adapted to engage underneath lugs 25 formed 8. Thus, although the spindle I2 revolves con tinuously, the sprocket wheels 8 are rotated in termittently, and the above-described gearing is so designed that the period during which the conveyor chain 6 is stationary occurs while one . of the groups of metal pigs I is in its operative position relatively to the elevator and is by this means caused to remain there for a su?iciently long period to allow of all the pigs being dealt with by the elevator. The sprocket wheels 8 are 60 then rotated by the above-described gearing to a su?icient degree to bring the group of pigs next in succession into the operative position rela tively to the elevator where it remains for a like period and the sequence of operations is repeated. The elevator unit comprises a pair of endless 65 chains I9 each encircling upper and lower sprock et wheels 20, 2|. The lower sprocket wheels 2| are mounted on the driving shaft I2 so that the sprocket wheels and elevator chains are continu 70 ally in motion in such a direction that the right hand portions of the chains, as seen in Figures 1 and 2, move in the upward direction. Attached to the elevator chains I9 is a series of five cra dles, each comprising two swinging members 22 75 respectively pivoted at 23 to the chains I9, the’ is again brought to the position in which it serves to lift the layer of pigs which, for the time being, is uppermost in the group which meanwhile has been brought by the conveyor to the operative position. In order to effect this selection of the upper most layer of pigs, each swinging member 22 is ?tted with an upwardly directed arm 28 having a transverse bar 29 adapted, as the elevator 40 chains travel upwards, to engage at its opposite ends one pair of a series of cam plates 30. As seen in Figure 3, in proximity to its lower ex tremity, each of these cam plates is so shaped that, as the transverse bar 29 comes into contact with the pair with which it co-operates, it is urged inwardly so vas to cause the corresponding mem ber 22 to rock in such a manner as to bring its inwardly directed extension 24 clear of the metal pigs. As, however, the cradle continues to ascend, the bars 29 clear the upper edges of the corre sponding cam plates 30 so that the members 22 swing inwardly and this action is arranged to occur at such a moment that the extensions 24 are caused to engage beneath the lugs 25 of the layer of pigs which, for the time being, is upper most: obviously, this must take place at progres sively lower positions as occupied by the succes sive cradles in the series. Thus, in the apparatus illustrated, there are ?ve cradles corresponding 60 to the number of layers of pigs I in each group, and the cradle which, as shown in Figure 2, is approximately at the middle of its ascent, has functioned to lift the topmost layer in the group. For this purpose, the members 22 must be sep arated for a suiiicient length of their travel to clear the metal pigs in the four lower layers and the co-operating cam plates 38 are, accordingly, of sui?cient length to prevent the release of these members until the extensions 24 are opposite the 70 topmost layer of pigs. The action of the succeed ing cradle, however, must be such as to clear only the three lower layers of pigs and engage the fourth which is now the uppermost layer. Ac cordingly, the cam plates 38 adapted to co-oper 75 3 2,108,457 ate with the bars 29 of this cradle must be corre 41 pivoted at 48. The opposite end of the lever spondingly shorter: similarly, those which co .4‘! is provided with a cam roller 49 adapted to operate with succeeding cradles must be made co-operate with a cam 55 on the shaft l2. The correspondingly shorter still. ‘This construction design and timing of the cam 50 are such that is ‘clearly illustrated in Figure 2, from which it immediately a layer of pigs has been lifted from the group under the elevator, the plunger 45 is withdrawn from engagement with one of the will also be seen that the bars 29 vary correspond ‘ ingly in length, the barson the members 22 con stituting the ?rst cradle being made sufficiently long to co-operate with the longest‘ pairs of c'am 10 plates which are located respectively at the out side of each series. The next'shorter pairs of cam plates 3|] are located immediately within the longest pairs and correspondingly the bars 29 son the members 22 of the next succeeding cradle 15 are shortened so as to engage with these pairs of cam plates 30. Similarly the cam plates 30 con tion so that it'is encounteredtby the next suc ceeding projection 44, whereupon the rotation of 15 the disc 3| and consequently of the group of crease in length‘ and in distance apart and the pigs in the operative position is arrested, the layer of pigs which is now uppermost being then in correct position for engagement with the 20 bars 29 adapted respectively to co-operate with For the purpose of rotating the group of pigs in operative position under the elevator, through a right angle'after each layer of pigs has been 25 lifted, there is provided a turntable occupying such a position that it is immediately under neath the rotatable table 2 bearing the group of pigs being operated on by the elevator. This turntable and each of the tables 2 are provided 30 with mutually acting engagement mechanism: the turntable comprises a disc 3|, Figures 4 and 5, cradle operating next in sequence: Figures 1 and 2 are drawn to depict this action as having al ready taken place. 7 > After the lowest layer of pigs in a group has been lifted, obviously time must be allowed for 25 bringing the neXt succeeding group beneath the elevator: for this reason, as seen in Figures 1 on which there are two dogs 32 separated by a parallel-sided space 33. As the tables 2 are and 2, the cradles are not equispaced along the elevator chains, the space between the cradle adapted to lift the lowest layer and that operating 30 on the topmost layer being longer than those between the remaining cradles. Since-the roller platform 26, on to which the drawn forward by the conveyor, chains 6, the pigs are delivered layer by layer, is inclined, the 35 disc 3| is in the position shown in Figures 4 and 5, that is to say, the parallel-sided space 33 lies in the direction of travel so that a squared pro jection 34 from the underneath of the rotatable table 2 which is about to be brought beneath the elevator may enter the space 33, and correspond ingly the way is clear for the table which has been emptied by the elevator to proceed on its pigs in each layer roll down it so as to make 35 way for delivery of those constituting the next layer. For reasons above mentioned, however, it is desirable that the pigs should be delivered to the melting pot one at a time, and for this purpose, there is provided a detaining and re leasing device, comprising a detent 5| pivoted at 40 the dogs 32, so that, on the disc 3| being rotated, the table 2 is rotated with it. For the purpose 52 and adapted to be rocked by means of a con necting rod 53 from a crank disc 54. This disc is ?tted on a spindle 55 driven by chain gearing 56 from the spindle 51 on which the sprocket wheels 20 are mounted. The detent 5| is formed 45 with two arms 58 and 59 and the arrangement of rotating the disc3| and dogs 32, there is pro is such that, on the detent being rocked, these course.v As indicated, particularly in Figure 5, each of the squared projections 34 is of such a width as to engage the parallel inner faces of vided a continuously revolving shaft 35 driven arms project alternately above the level of the in any suitable manner such, for example, as by rollers 26. For instance, in Figure 2, it will be means of bevel gearing from the shaft l2.‘ On seen that the arm 58 is so projecting and is con the shaft 35 there is a worm 35 meshing with a sequently preventing the pigs from sliding oi? the roller platform 23. On further rotation of the crank disc 54, however, the arm 58 will be de pressed below the level of this platform, but worm wheel 31 ?tted with an upwardly project ing stud 38 adapted to engage a projection 39 , on a band 40 comprising one element of a fric tion drive. The other element comprises a drum Ill and between the band 40 and drum 4| there is interposed a suitable friction lining 42. The disc 3| and drum 4| are ?xed'on a spindle 43, 60 on which the worm wheel 31 is loosely mounted; thus the disc 3| is continuously rotated from the‘ shaft 35 through the worm gearing and friction drive, unless it is forcibly prevented from' doing so, in which case ‘the friction drive allows for , disc 3| ‘and with it the table 2 and its layer ofpigs which is in the operative position. Be fore, however, rotation through a right angle has 10 been completed, the cam 50 has operated to allow restoration, by such means as a spring not shown, of the plunger 45 to or toward its original posi stituting the succeeding pairs progressively de 20 them are correspondingly of progressively de creased length as shown in Figure 2. ' 40 projections 44, thus permitting rotation of the slipping. Obviously, as soon as a layer of pigs has been lifted by one of the cradles, the group of pigs 50 previously to this action the arm 59 has risen so 55 that the foremost pig only is free to slide off the platform, the remainder being detained by the arm 59. Continued rotation of the crank discv 55 results in depression of ‘the arm 59 and’ elevation of the arm 58, when the remaining pigs slide down the roller platform 26, but are arrested by the arm '58, which has been elevated. The, sequence of operations is then repeated so that the pigs are released one by one. On leaving‘the roller platform '25, each pig runs on 65 to a. second roller platform 60 extending at right angles to the roller platform 26, whence it is should be rotated through a right angle and then held stationary until the next layer has been delivered to the melting pot. ' ' lifted by the succeeding cradle. For the purpose The apparatus illustrated in Figures 6 to 10 is of thus allowing rotation and then arresting the of the same ‘general type as that above described, 70 group of pigs, the disc 3| is provided with a series comprising, namely a conveyor unit adapted to of projections 44 adapted to be engaged in turn co-operate with an elevator unit by which the by a plunger 45 mounted so that it can oscillate pigs are delivered‘to a delivery device adapted to in‘a ‘stationary guide 46 and jointed'to a lever' feed them to the melting pot one at a time. ' As 75 4 2,108,457 in the previous case, the metal pigs l are mount ed on a series of tables 2 connected with an end less conveyor chain 6 passing around sprocket wheels ‘I and 8. The elevator, however, although of the type comprising an endless chain passing around upper and lower sprocket wheels 20 and 2|, does not operate continuously in the same di rection, nor is it provided with a series of cradles. Instead thereof there is a single cradle unit which is caused to travel upwardly and, having reached its highest point as determined by the upper sprocket wheel 26, to move downwardly so as to deposit its load of pigs on to the roller platform or like delivery device 26 and then to return by 15 the same path for a further layer of pigs. The conveyor and elevator are respectively driven by separate electric motors 6|, 62, each operating through suitable gearing, while a third electric motor 63 serves to actuate the turntable mecha nism. Obviously, none of these motors is re quired to run continuously in the same direction and they are automatically controlled both manu ally by “start” and “stop” press buttons and auto matically by the various movements of the ap 25 paratus in the manner described below. Indica tions are given on the drawings of the various switches actuated by the apparatus during the matically to reclose itself, but not until the motor circuit has been interrupted by another switch, the action of which is described below. As above mentioned, the elevator is provided with a single cradle only. This comprises a pair of swinging members 66, seen most clearly in Figures 9 and 10, having inwardly directed pro jections 67 adapted to lift the uppermost layer of pigs in a manner similar to that existing in the previously described apparatus. The mem 10 bers 66 are pivoted at 66 to a cross beam 69 adapted to slide in vertical guides 10. In Figure 9 the cradle is depicted in full lines as travelling in the downward direction and in chain-dotted lines as having engaged the uppermost layer of 15 pigs and about to commence its upward travel. Obviously, the lowest point to be reached by the cradle must be determined by the height of the particular layer of pigs which, for the time being, is uppermost; that is to say, if a group of pigs 20 has just been introduced beneath the elevator, the downward travel of the cradle must be a minimum in order that it shall engage and lift only the topmost layer of pigs. On its next journey, how ever, it must reach a lower point in order to en course of its operation, but it is to be understood positions. that, generally speaking, such representations are In order to determine the point of reversal, the cross beam 69 is provided with a plunger ll, which, on the downward travel of the cradle, comes into contact with the upper surfaces of 30 of a diagrammatic nature and are not intended to afford any indication of the actual construction of switches employed. In the apparatus now under consideration, six tables are employed, as indicated in Figure 6, the loading position for each of these being, as in 25 gage the second layer and, on subsequent journeys, it must travel to successively lower the pigs in the uppermost layer for the time being. Motion of this plunger is, therefore, arrested, but, as the cross beam 69 continues to travel down 35 the previously described apparatus, toward the wardly, the plunger slides through it. right-hand end of the machine as seen in Figure 6. In order to load each table, it is necessary that the conveyor should be stopped with the er is provided with upper and lower collars 12 and 13: these collars co-operate with one arm of a bell-crank lever 14 pivoted at 15 to a bracket carried by the cross beam. 69. The other arm of 40 the bell-crank lever 14 is jointed to a plunger 16 mounted in a guide 11 on the cross beam 69 so as to be capable of motion in the horizontal direction, and it will be seen that, on arrest of the plunger 'H by contact with the uppermost 45 40 table in its appropriate position, and for this pur pose there is provided a switch A adapted, as the conveyor chain 6 travels in such a direction as to bring the tables toward the elevator, to be actuated by means of one of a series of buttons, 45 rollers or the like 64. These are carried by the The plung chain 6 in such positions relatively to the vari layer of pigs, such horizontal motion of the plung ous tables as to actuate the switch A successively when the various tables arrive at the loading posi tion. Due to such actuation, the circuit of the er toward the left, as seen in Figure 9, will occur. motor 6|, which has hitherto been running in order to drive the conveyor, is. broken and the conveyor therefore stops. The construction of the switch A is, however, such that after a few seconds it again closes, but during that period the ' circuit of the motor 6| has been opened by the control apparatus at another point, so that the motor does not restart on the automatic closing of the switch A. When, however, the loading operation on to the particular table in the load ing position has been completed, the “start” press button of the apparatus is operated manually, re sulting in the restarting of the motor 6! and the travel forward of the conveyor until the next following table has arrived at the loading posi ' tion, whereupon the conveyor is again stopped automatically and the sequence of operations re peated. For the purpose of arresting the tables suc cessively in the position in which the elevator 70 may operate on the groups of pigs thereon, a switch B is provided. This is adapted to be suc cessively actuated by a second series of buttons, rollers or the like 65, suitably located along the chain 6. The switch B also operates to inter 75 rupt the circuit of the motor 6| and then auto When this takes place, the plunger is opposite some portion of a swinging frame 18 which ex tends vertically over a height approximately equal 50 to that of a complete group of pigs; the frame 18 is supported by pivoted links 19 and is spring biassed in a direction opposite to the above mo tion of the plunger 16. The frame 18 co-operates with a switch C which, on actuation, is effective 55 to reverse the motor 62 which drives the elevator. This action occurs at the moment when the ex tensions have engaged the layer of pigs upper most for the time being and results in the down ward motion of the cradle being stopped and its 60 upward motion with the layer of pigs commenc mg. The cradle rises to its highest position as deter mined by the travel of the elevator chain over the sprocket wheel 20, moves across to the opposite side of the elevator in a manner similar to that followed by the cradles in the previously described apparatus, and then descends so that the pigs are deposited on to the roller platform or like deliver-v ing device 26, whence they reach the melting pot 70 one at a time by detaining and releasing mecha nism similar to that previously described. The depositing action is illustrated in Figure 10, wherein in full lines the cradle is shown as ap proaching the roller platform 26 and in dotted 75 5 2,108,457‘ lines as having depositedits layer of pigs thereon. is not again ‘operated to restart the motor ‘63. The downward‘motion of the cradle is," however, allowed to continue somewhat and the swinging Obviously, the action of the ramp I02 on the switch D must be maintained for such a time as to members 66 are thereby thrust apart owing to the allow suf?cient'rotation of thedisc 95 to cause 5 fact ‘that diverging plates '80' ?tted thereto en the lever 91 to be ejected from the notch in which 5 counter ?xed ramps 8!. .In this separating mo- , it has been resting. Rotation of the group of pigs tiontrollers or studs 82 ?tted tothe backs of the through, a right angle corresponds to such a ro swinging members 66 push back flaps 83 pivoted at, Bit, and When'the rollers or studs 82 reach a 10 position beyond the bottom edge of the flaps '_.83, ‘ the lattersfall back into their normal position, so that, when the elevator is reversed and the cradle commences its upward'travel, the rollers or studs 82 bear on theyoutside of the flaps. 83,.‘thereby ' l5 maintaining the swinging members, (it in their extended position. This action is, however,1main tained only' overthe ?rst portion of ‘the upward travel, since above the ?a'ps83 there are gaps 85 which, when reachedyby therollers‘or studs 82, .20 tation of the disc 95 that the end‘of the lever Bl’ drops into the succeeding notch 96 and oper ates to stop the motor 63. “ " - ‘ ' " ‘ 10 After the table beneath the elevator has‘ been emptied,‘ it, is, ‘of course, necessary to restart the eonveyor, in order that the next table in, succes sionrnaybe brought into co-operative relation ship with the elevator. For this purpose a switch H is "provided'actuated by a lever I03 carried by ' the ldisc 95. [As in'dicated'in Figure 8, between the notch '96 correspondingto the lowest layer of pigs and that corresponding to then-highest layer, the perfnit’th‘e swinging members 66 ‘to fall inwardly angular distance is doublejthat between the re 20 to?their," normal ‘position. ,The object‘ of thus ‘maining ‘notches. ’ Thus, aftersthe lowest layer keeping,,.'them separated until, on its return mo has been removed, the turntable 181 revolves tion,'the cradleisclear of the roller platform 26, is to prevent the possibility ‘of its again lifting the pigs which'have just been deposited ‘and have through 180° in order that the elements of the ‘ engagement mechanism respectively on the von coming ‘table 2 and the turntable ill-maybe in 25 failed to roll down the platform 26 owing to the their proper mutual engagement position. This presence of. other pigs, lower down ‘the platform- or rotation of the turntable havingv been e?ected, for any other cause. 'iReversal' of theelevato-r the lever Hi3 actuates the switch H, with the re after the cradle has passed the roller platform sult that the motor 6|, is restarted and the con-. >30 26 is effected by means ‘of a switch'sE, actuated by V‘veyor. travels forward until the button or roller 30 a'ramp 86 carried by the cross'beam‘ 69. ' _ 7 It will be appreciatedthat, as in the previously described apparatus, rotation through a right an-. 65 next in succession operates to open the switch ‘ B. This, of course, occurs when the next suc ceedingptable 2 has been brought into co-opera gle of the group of pigs in operative relationship ‘tive relationship with the elevator and the above- ' 7 35 with theelevator is required ‘after the lifting of each layer. This is effected by meansof a turn table}? rotated from the electric motor 63 oper ating‘through worm gearing 88, bevel gearing 89 and spur gearing 90, adapted to drive a spindle .49 9! on which the turntable 8'llis mountedpthese elements ,being‘clearly seen in Figures '7' and 8. Each of the tables 2 and theturntable 8‘! are pro-' described sequence of operations is then repeated. _ Asabove mentioned-the switch B recloses itself, ' but not until the lever I03 has rotated su?iciently to allow the switch Hto reopen. ' In order, after the last table has been emptied and has passed from ‘beneath theelevator, to stop the conveyor and theelevator, a'switch F is pro vided. This affects the circuit ofboth the motors 6 land 62 so that these motors are stopped. The vided' with engagement mechanism similar .to that adopted, inrthe apparatus previously dee‘ switch F is actuated by a button, roller or the like 45 scribed anda description'thereof, in the present _ attached to the last of the series of tables 2 or to 45 agpoint on the conveyor chain 6 in' proximity ‘ instance, is therefore'unnecessary. The spindle 9| ‘of the. turntable .81‘ is further provided with a spuri‘wheel 92 meshing with a gear wheel 93 mounted on a spindle 94 which also carries a disc :50 95; having five notches 96 corresponding tothe ?ve'layers of pigs in each group, and spaced as indicatedinFi'gure 8. C'o-operating‘ with these notches is alever 91 ‘pivoted at 9B and having at tached at its outer‘end a cord orchain 9v9spassed , theret o'; Thus, after all the tables have been emptied, the whole rapparatusis entirely discon nected from the power circuit. ' " > Figures 11 and Y12 taken together constitute a 50 complete electrical ‘diagram of‘ the apparatus illus trated in Figures 6 to 10, certain of the items of that vapparatus being shown in Figures 11 and 12 and marked‘with corresponding references. For 5 over an idler wheel H10 and provided at‘its lower _ the sake'of'lavoiding undue complication of the end with a ‘weight fill. The cord-io-r chain 99is diagram, however, certain features of ordinary adapted to operate a~switch G in the circuit of construction which would necessarily be embodied the motor 63, in such a manner that,'on rotation in the apparatus, for example, shunt windings of of the disc 95 in a clockwise direction, which- is the motors, automatic starting rheostats, overload 60 that ‘imparted to it‘by the motor 63, when the end relays, are omitted, their methodof- connection in of‘ the lever'il'l drops into one of the notches 96,. > the system being perfectly obvious to those'skilled ' the motor 63 is stopped. The period of stoppage, , in the art and constituting no feature'iof the pres; of course, corresponds to‘that during which the cradle of the elevator ‘is travelling downwardly ,‘65‘toward ‘the group ‘of pigs ‘and is engaging and lifting the uppermost layer. ' After this action has ent invention. ‘ V 7 60 > The-elements whichcontrol the action of the various items of electrical apparatus are assembled on a board I21 indicated in Figure 12. 65 This board is represented as provided along its right-hand margin with ‘a series of terminals, to each of occurred, rotation of the group of pigs is neces sary and, accordingly} the motor‘ 1673 must be started] ‘This’ is veffectedby a switch D actuated 70 by’a, ramp I02 carried by the cross beam 69. _The which there is allocated a reference letter or nu meral'. In orderto facilitate tracing‘ out the vari construction of the mechanism acted upon by the ous connections on the diagram, the same'refer ramp lll2,,_howe,velr, is such‘that theswit'ch D is operated only on the upward motion ofthe cradle so ‘that, when, the ‘latter returns “after vdepositing ‘'75 its load-of pigs on the platform 2'6,th_e switch D 55 70 ence‘letters or numerals ‘are respectively attached to various details of the apparatus which are di» rectly'connected to the corresponding terminals on the board I21. In order further to facilitate 75 "2,108,457 6 tracing connections, 'where‘n'ec'es'sary, from Fig ure 11 to Figure 12, the electrical leads which, owing to the necessity of employing two ?gures to represent a single diagram, are broken, have been marked correspondingly on these ?gures with the references a, b, . . . w, at. These mark ings, however, do not constitute references in the normal sense of the term and will not be men tioned in the following description of the dia gram. The electrical supply to the apparatus is as sumed to be direct current through a main double-pole switch I28 which at all times when the apparatus is in operation would be closed, 15 thus making the terminals I29 and I38 respec tively permanently positive and negative. Fur ther, owing to certain ?xed connections, certain other points in the apparatus will always possess a given polarity during the whole time that the 20 switch I28 is closed. Thus the terminal W of the “start” push button I3I is permanently posi tive, being connected to terminal I29 by leads I32, I33. Similarly the lead I34 connected to lead I33 renders the contact I35 of the switch E the conveyor motor so that the table is stopped in positidn “Y”, and makes circuit from positive at contact I38, switch B, lead I64, switch F, lead I65, terminal I I4, lead I66, relay coil I61 to nega tive at I44; switches I68, I69 and I18 are thus closed. This completes circuit from positive at contact I38, switch B, leads I64, I1I, terminal II5, lead I12, switch I69, lead I13, arm of interlock switch I14, contact I15, leads I16, I11, terminal I23, lead I18, switch C, lead I19, terminal I22, 10 lead I88, elevator motor “down” contactor coil I8I, leads I82, I83, I84, to negative at I44; switches I85, I86, I81, I88 are thereby closed. The circuit of the elevator motor is thus completed from positive at terminal I29, leads I59, I89, I98, switch I86, leads I9I, I92, terminal Y, lead I93. ?eld-winding I94 of motor 62, lead I95, terminal Z, lead I96, switch I81, lead I91, terminal LE, lead I98, armature of motor 62, lead I99, terminal AE, lead 288, switch I88, leads 28I and 282, to 20 negative at terminal LT. The elevator is thus started so that the cradle 66 travels in the down ward direction in order to pick up the layer of pigs which, for the time being, is uppermost. As permanently positive, and, further, the contact this occurs, the switch C is actuated by means of‘ I36 of the switch D and the contacts I31 and I38 of the switch B are rendered positive from lead the plunger H as described with reference to Figure 9. Accordingly, circuit is broken between I34 via leads I39, I48, I4I, I42. Similarly, from the negative terminal I38 via lead I43, the ter minals LC and LT are permanently negative, and this remark also applies to terminal I I I and point I44 connected with terminal LT via leads I45, I46. In the ensuing description, therefore, certain cir the contacts I22 and I23 of the switch C and made at contacts I28 and I2I. This operates to cuits will be traced between these points as being 2 positive and negative respectively. opposite direction is, however, completed by the As above described, the ?rst action required is from positive at terminal W, leads 283, 284, switch I68, leads 285, 286, terminal I2I, lead 281, switch 25 the loading of the tables 2 with the groups of pigs and for this purpose they must be successively brought to and retained in position “X” immedi 40 ately above the switch A, this switch being there by opened so that the conveyor motor 6| is de-energize the elevator contactor coil I8 I, where by the switches I85, I86, I81 and I88 are opened and the motor 62 stopped. Circuit whereby this motor is restarted in the contacts I28 and I2I of switch C. This circuit is stopped. ’ Normally, however, the switch is closed C (lower contacts) lead 288, terminal I 28, leads 289, 2I8, terminal II9, lead 2II, switch E, lead 2I2, terminal II8, lead 2I3, elevator motor “up" 40 contactor coil 2I4, leads 2I5,'I83, I84, to negative at I44. This closes switches 2I6, 2I1, 2I8, 2I9, and on pressing the “start” push button I3I, cir cuit is established from positive at the terminal 228 and starts the elevator motor in the reverse direction so that the cradle 66 is raised. For this 45 W of the push button, through the push button, leads I41, I48, relay coil I49, to negative at I44. This results in closing relay switch I58 and cir cuit is then made from positive at contact I31 of switch B, through the switch, lead I5I, terminal 50 II2, lead I52, switch I58, coil I53 of conveyor motor contactor, lead I54, terminal II3, lead I55, switch A, lead I56, to negative at terminal III. This closes the holding-on switch I51 and the main conveyor motor switch I58. Circuit to the 55 conveyor motor is then established from positive at terminal I29, via lead I59, switch I58, lead I68, terminal AC, lead I6I, conveyor motor 6|, lead I62 to negative at terminal LC. The conveyor then operates to bring the ?rst table 2 to posi 60 tion “X” at which it opens the switch A, thus stopping the conveyor. As explained above, how ever, this switch is of such a construction that, after a certain period, it automatically recloses it self; hence, when the table 2, which is in the load ing position, has been loaded, on again depressing the “start” push button, the conveyor motor 6| is started and the conveyor travels until the suc— ceeding table 2 breaks circuit at the switch A, this cycle of events being repeated for the loading operation of each table. On arrival of the table 2 in position “Y” in which it is in co-operative relationship with the elevator, the switch B breaks circuit between its contacts H2 and I31 and makes circuit between contacts I38 and I63. This breaks the circuit of purpose circuit is completed from positive at ter~ 45 minal I29 leads I59, I89, switch 2I8, lead I92, ter minal Y, lead I93, ?eld-winding I94 of elevator motor 62, lead I95, terminal Z, lead I96, switch 2I9, lead 288, terminal AE, lead I99, armature of elevator motor 62, lead I98, terminal LE, leads I91, 22I, switch 228, lead 282, to negative at LT. As the cradle 66 begins to ascend switch C breaks circuit at contacts I28, I2I and remakes it at con tacts I22, I23. The contactor coil 2I4 is not,hoW— ever, thereby, de-energized, its circuit being main 55 tained through‘the holding-on switch 2I1, As‘ above described, the cradle 66 on passing the switch D actuates it to start the turntable motor 63. The electrical circuits operative to this end will be described below. As the elevator motor 60 continues to operate, the cradle actuates the switch E to break circuit at contacts I I8, I I 9 and to make it at I I1 and I35; thereby the circuit of the contactor coil 2I4 is broken and the switches which it controls opened, stopping the elevator motor. Completion of circuit at contacts H1 and I35 of switch E results in restarting the elevator mo tor in the opposite direction, the circuit being from positive at contact I35, through switch E, 70 lead 222, terminal II1, lead 223, reversing relay coil 224, lead I84, to negative at I44. This closes switches 225 and 226, establishing circuit from positive at terminal W via lead 283, switch I18, lead 221, switch 225, leads 228, I16, I11, terminal 2, 108,457 i123, lead I18,“switch ‘0, lead I19,‘-ternii'nal J22‘, lead 180, contactor coil'I8I-, leads'l82, I83,JI84, to negativei'at I46. :This closes the-main- switches I86, I81 and I88 of the circuit'which, as above explained,v causes theelevator motor to'be started in such‘a direction that the cradle 66 travels downwards and the sequence of: operations is'then repeated.’ As soon ‘as the cradle 66 leaves the switch E circuit is opened at Contacts I I1 and l35 and reclosed at H6, H9, ‘The circuit of coil IBI, however, >. remains 5‘ closed - ‘through I holding-on switch 15 I85. '- v 1 ., - a ' ‘switch, this‘ switch-being provided‘for the'pur pose of ensuring vthat‘when theelevator isstarted by‘the arrival of atablei 231', position-“Y” it shall .25 travel in the appropriate5direction. 3 Thus, in ‘the above description, it is Iassumedthat‘initial travel layer of pigs was'required, ‘and,,ac‘cordinglyg'pra in the d‘ownwardndirection in order‘ to take up a , vious‘downward ‘travel; of the‘cradle would‘have served to lock the interlock ‘switch ‘so ‘thatit‘s arm ‘I'M bore on contact‘ I'l5._‘ gHad‘, however, , the travel of the ‘cradle, before the ‘elevator motor 62 was‘pre‘viously stopped, been in the upward ‘direc tion, the arm§226 ‘of the interlock switch would 35 have been bearing on‘ the contact 236, contact beg tween the arm l ‘M and‘ contact I15 being broken. ’ The actio‘n'of the mechanism to effect this result is well known , and‘ need “not be‘ further: alluded to. Contact ‘ being made‘; between-the arm’ 229 and ‘contact .230, circuit: would‘l‘be‘ established ‘from positive "at'contactr 5,3,8 through switch 3 leads I64, VIM-terminal‘ H5, le‘adI'IZ, switch‘ _l69,, lead I13, arm 229, contact 236; leads 23I,‘2I0, terminal H9, lead 2! I,‘ switch‘ ‘E; ‘lead 2I‘2, terminal’ IIB',‘ lead 2I3,,cont‘actor coil 2M, leads2l5, 183; I84, to negative at I66. This serves to‘close switches 2 I8‘; 2 I 9 and 22.0, whereby the ,‘elevator‘motor is started in such a direction as to cause the cradle to travel v f - ‘ 50 v The action‘ ‘of ‘the switch D in controlling the turntable motor- 63_wi1l now be described. " As the cradle 66 passes the'f‘switch D,”circuit is broken at 55 60 contacts I 24 and I36and made at‘contacts I25 and 232. This establishes circuit from positive ‘at contact ‘232 through switchD, lead ‘233; terminal I25, lead 236, switch 2I'6,“ lead 235,'turntab1le moe tor contactor coil 236, leadsv .231, I786, to?neg'ative at Hill." This operatesto‘ close switchesw ‘238 and 239, and establishes circuitfromipositive ‘at iter-v minal I‘29,‘_"leads§l59; I39, switch 239, leadf‘24B, terminal AT, le'adf24l, turntable motor 63, lead 262, to negative at terminal ‘LT. Gearedto re 65 volve with the motor‘ 63‘ isthe ‘star-wheel 95, whereby switch G ‘is'uhactuated.v Qn rotation of the ‘star-wheel ‘95 the switch G, bridges‘ contacts I26, 243; ‘whereby, shortly after the turntable mo-i tor 63 hasbeen; started, alholding-on (circuit is completed from positive absenteeism: jswitch B via lead'ZM, ‘switch G, lead ,‘2'45,jtermirnal 1 I26, lead 2416, switch 238, contacto‘r‘coil 2'36, leadsjv‘2‘3‘1, E84, tonegative at I44. 'When,‘how.ever, the turn: table motor 63 has‘revolved suf?cientl‘y ‘to turn the. ‘table. 2 for the time being ‘in"positionl"‘Y,” through'a right angle, the star-wheel ‘95 opera 75 cites to open'the switch‘G whereby the‘turhtable ‘ r contacts at H6 after the last layer of pigs has been ‘lifted,v and before the cradle 66 reaches the In per- ~ forming these repeated reversals, howeverfcircuit isv established independently of the [interlock upwardly as previously described, , ‘order that, for the reasons above mentioned, the turntable shall be rotated through 180° instead 10 ation. ’ This is ‘driven in such a manner as to close in‘ ‘the upward‘? and downward direction? as ‘re 40 lifted, ‘the switch G is maintained closed for a period twice the length of its previous closures in has'been emptied, the switchi‘H comes into oper position ‘t‘Y”, it will continue by'virtue‘of‘ its-co quired‘u‘ntil the table‘has- been emptied; cycle of operations‘repeated. It will, however, be I" observed that the form of the star-wheel 95 is such that, after the last layer of pigs has been In order to re-start the'conveyor ‘after a table operation with‘- switches C and E'to ‘be repeatedly reversed so thatthecradle 66 travels‘: alternately 20 opened thereby stopping the motor 63. It is then . re-started as the cradle 63 on its succeeding up ward travel passes the switch D and the above of 90°. ‘ *It will belnoticed that;v once the- elevator ‘has been started. by ‘one-‘of the tables 2 arriving; at 7 contactor 236 is delenergized‘ and its switches switch‘ E. : ‘When 'actuation‘of this switch by the cradle, occurs, the contacts In and !35 are ' ‘bridged and the reversing relay coil 22,4 excited 20 as above described. ‘Circuit is then established from‘positive at contact I 31 of switch B through lead 246, contacts ‘I I6 of switch H, lead 241, ter minal I I6, lea‘d 248,'switch 226,‘ lead 266, conveyor “contactor coil I53,=lead'I54,‘ terminal II3‘,‘le'ad'I55, ‘ self-closingswitch A,llead I56 to negative'at-‘ter minal'l I I_; thereby switches I57 and I58 are closed and the conveyor fmotor. 6|’ started as above set forth. The conveyor then travels until the suc-' ceeding ‘table arrives at position “Y” at which it operates switch B ‘which servesv to stop the con veyor'and control the movements of the elevator and turntable in the manner above described. After the'last table of the series has been ’ emptied and has left position “Y”, switch F is 3 opened by the'conveyor as above stated. This operates to break thecircuit of the relay coil I67, allowing switches I68, I69, and I'Hl toiopen and stop the elevator. Motion of the conveyor, how= V everjcontinues until the switch of the motor 6| 40 is opened by actuation‘ of the switch‘A when the leading tableof the series arrives at position “X”. »} »While two examples of apparatus in accord ance with the‘invention have been described and ‘illustrated, it is obvious that many other combina~ “ tions within its scope might be'devised. Fur their, features above described might be combined in ‘other ways: for instance, in the'apparatus de picted in Figures 1 to 5, in place of‘ driving the conveyor intermittently from a continuously re volving shaft, it might be actuated by a separate electric‘motorVunder‘automatic control, as de scribed with reference to Figures 6 to 10. - . , ~ ‘What‘I’claim, and desire to secure‘ by Letters ' Patent of the United‘States is: 555 ‘1. Apparatus for" the‘ automatic delivery of ‘metal pigs, comprising’in combination a conveyor in co-‘operativ‘e relationship with an elevator, a series of tables on said conveyor for the recep tion‘of groups of pigs, each of said tables being revoluble about an axis at right angles to'its sup— porting surface, means for rotating the table in said series for I‘thetime being in operative rela tionship with the‘ elevator througha right angle after each layer of pigs in a group on said table has been ‘lifted and a delivery device, on which ‘each layer of lifted pigs is deposited. ' '2‘. Apparatus for the automatic delivery of. metal‘pigs stacked in superposed layers wherein the pigs in each layer lie at right angles to the pigs in the next layer, comprising in combination a conveyor in co-operative relationship withian elevator constituted by upper‘ and‘lower sprocket wheels and endlesstravelling chain mechanism, a series of 'lifting'cradles on said chainmechanism, 2,108,457 8 tion to lift a layer of pigs from said conveyor and has deposited said layer on said delivery device. 8. Apparatus for the automatic delivery of metal pigs, comprising in combination a con and means operatively associated with the‘cradles for rotating the stack of pigs relatively to the conveyor to bring the top layer of pigs into posi tion to be lifted, and means for causing the veyor in co-operative relationship with an ele vator, an electric driving motor for said ele vator, a lifting cradle on said elevator, a de cradles selectively to lift the top layer of pigs. 3. Apparatus for the automatic delivery of metal pigs, comprising in combination a conveyor livery device, reversing switches in the circuit in cooperative relationship with an elevator, a series of tables on said conveyor for the recep— of said motor and actuating means for said switches automatically operative when said cra 1O 10 tion of groups of pigs, each of said tables being revoluble about an axis at right angles to its sup porting surface, a continuously rotating shaft, a friction slip device comprising driving and driven members in operative. connection with said shaft, dle respectively is in operative lifting position relatively to the top layer of a group of pigs in operative relationship with said elevator and has deposited said layer on said delivery device. 9. Apparatus as in claim 8, wherein the actu ating means effective for reversal when the cradle is in position operative for lifting includes an element so located as, when the cradle travels downwards, to bear on the successive top layer mutual engagement mechanism associated with the driven member of said slip device and with each of said tables and means, controlled in syn chronism with the movements of said elevator, for intermittently arresting rotation of said driven member. 4. Apparatus for the automatic delivery of 20 of pigs. 10. Apparatus for the automatic delivery of metal pigs, comprising in combination a con veyor in co-operative relationship with an ele metal pigs, comprising in combination a conveyor in co-operative relationship with an elevator, a series of tables on said conveyor for the recep 25 tion of groups of pigs, each of said tables being revoluble about an axis at right angles to its sup porting surface, a continuously rotating shaft, a vator, a series of tables on said conveyor for the reception of groups of pigs, each of said tables 25 being revoluble about an axis at right angles to its supporting surface, an electric motor for ro tating the table in said series for the time being friction slip device comprising driving and driven members in operative connection with said shaft, mutual engagement mechanism associated with the driven member of said slip device and with in operative relationship with said elevator through a right angle after each layer of pigs 30 each of said tables, a disc in driving relationship with said driven member, projections on said disc, a plunger movable into or out of engagement with 35 any of said projections, and a pivoted lever for actuating said plunger in synchronism with the movements of said elevator. 5. Apparatus for the automatic delivery of metal pigs, comprising in combination a con— 40 veyor in co-operative relationship with an ele vator constituted by upper and lower sprocket wheels and endless travelling chain mechanism, a series of lifting cradles on said chain mecha nism, each of said cradles comprising a pair of 45 pivoted members capable of swinging toward or away from each other, means for rotating said sprocket wheels continuously in the same direc tion, a projecting element on each of said pivoted members and a plurality of cams each of which 50 is adapted selectively to engage one of the pro jecting elements thereby holding the pivoted members to which they are engaged out of en gagement with selected layers of pigs. - 6. Apparatus for the automatic delivery of .55 metal pigs, comprising in combination a con veyor in co-operative relationship with an ele vator, a cradle on said elevator, mechanism on said cradle for lifting the uppermost layer of metal pigs in a group, a delivery device and means 60 for raising said cradle from the position in which it is effective to lift a layer of pigs from a group in operative relationship with said elevator to that in which it deposits said pigs on said de livery device and for returning said cradle by the same path. (2 - 7. Apparatus for the automatic delivery of metal pigs comprising in combination a con veyor in co-operative relationship with an ele vator, an electric driving motor for said elevator, 70 a cradle on said elevator, mechanism on said cradle for lifting the uppermost layer of metal pigs in a group, a delivery device, ,reversing switches in the circuit of said motor and actu ating means for said switches automatically op 75 erative when said cradle respectively is in posi on said table has been lifted, a starting switch in the circuit of said motor and actuating means for said switch operated by said elevator after each of said layers has been lifted. 11. Apparatus for the automatic delivery of metal pigs, comprising in combination a con veyor in co-operative relationship with an ele vator, a series of tables on said conveyor for the reception of groups of pigs, each of said tables being revoluble about an axis at right angles to its supporting surface, an electric motor for ro tating the table for the time being in operative relationship with said elevator through a right angle after each layer of pigs on said table has been lifted, a switch in the circuit of said motor and means, actuated on rotation of said table, whereby, on completion of rotation through a right angle, said switch is opened and said motor stopped. 12. Apparatus for the automatic delivery of metal veyor vator, veyor, pigs, comprising in combination a con in co-operative relationship with an ele an electric driving motor for said con a switch in the circuit of said motor, mech anism automatically actuated by the motion of 55 said conveyor whereby said switch is opened when said conveyor is in a position such that a group of metal pigs on said conveyor is in operative re lationship with said elevator, and mechanism for closing said switch automatically actuated on re moval of the lowest layer of pigs in a group in operative relationship with said elevator. 13. Apparatus for the automatic delivery of metal pigs, comprising in combination a convey or in co-operative relationship with an elevator, 65 an electric driving motor for said conveyor, a switch in the circuit of said motor, mechanism automatically actuated by the motion of said conveyor whereby said switch is opened when said conveyor is in a position such that a group of 70 metal pigs on said conveyor is in operative re lationship with said elevator, a further switch in the circuit of said motor, a series of tables on said conveyor for the reception of groups of pigs, each of said tables being revoluble about 9 2,108,457 an axis at right angles to its supporting surface, a motor for periodically rotating the table in said series in operative relationship with said ele vator through a right angle and means for clos ing said switch automatically actuated by said second-mentioned motor. 14. Apparatus for the automatic delivery of metal pigs, comprising in combination a conveyor in co-operative relationship with an elevator, an 10 electric driving motor for said conveyor, a switch in the circuit of said motor, mechanism automati cally actuated by the motion of said conveyor whereby said switch is opened when said con veyor is in a position such that a group of metal 15 pigs on said conveyor is in operative relationship with said elevator, an electric driving motor for said elevator, a switch in the circuit of said mo tors respectively actuating said conveyor and said elevator and means for opening said switch 20 automaticaly actuated on motion of said con veyor after the last group of pigs has been re moved from its position of operative relationship with said elevator; 15. Apparatus as in claim 6, including out wardly inclined ramps located in that part of the path of the cradle traversed immediately after said layer of pigs has been deposited on said delivery device and pivoted ?aps in proximity to said ramps, whereby the elements of said cradle are separated clear of said layer of pigs and are maintained so separated during the return travel of said cradle past said layer. ' 16. Apparatus for the automatic delivery of 10 metal pigs, comprising in combination a conveyor in co~operative relationship with an elevator; a series of tables on said conveyor for the recep- , tion of groups of pigs, each of said tables being revoluble about an axis at right angles to its sup 15 porting surface, and means in operative associ ation with said elevator for intermittently rotat ing the table for the time being in operative re lationship with said elevator about its axis through a right angle. 20 VINCENT TOBIA.