US1032306A - Pot-charger for linotype-machines. - Google Patents

Description

E. E. SPENCER.

POT CHARGER FOR LINOTYPE MACHINES.

APPLICATION FILED APR.1,1912.

Patented July 9, 1912.

awoautoz Witnesses B. B. SPENCER.

POT CHARGER FOR LINOTYPE MACHINES.

APPLICATION FILED APR.1, 1912.

1,032,306, Patented July 9,1912.

4 SHEETS-SHEET Z E. E. SPENCER.

POT CHARGER FOR LINOTYPE MACHINES.

APPLICATION FILED APR. 1, 1912.

1,032,306. Patented July 9, 191

4 SHEETS-SHEET 3 E. E. SPENCER.

POT CHARGER FOR LINOTYPE MACHINES.

APPLICATION FILED APR.1,1912.

2 m H I... E 9 n W 4 m n m P To all whom it may concern:

'Machines; and I do declare the following which serves also as a heat retainer so that whereby the pot is charged at frequent ina stock feeding device in the magazine. and

njNrrED sTAirasrarENT oFrioE.

EDWARD EVERETT SPENCER, OF NEW YORK, N. Y.

POT-CHARGER FOR LINOTYPE-MACHINES.

'Application filed April 1,

Be it known that I, Eowixan Evamrr'r SPENCER, a citizen of the United States, re siding in'the city of New York, in the county of New York and State of New York, have invented certain new and useful lm provements in Pot-Chargers for Linotypeto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertaius to make and use the same.

This invention relates to casting apparatus used in metal founding, and more especially to pot charging devices; and the object of.the same is to produce a machine whereby the melting pot of a linotype machine will be periodically charged or replenished with slugs or stock whenever the type metal therein becomes depleted, and wherein the charging of the pot will occur automatically and the operator is therefore relieved of the necessity of giving it his attention. It frequently happens that the operator forgets to charge the pot at frequent intervals as necessary, owing to the excessive demands on his time, and it follows that the molten metal becomes so much depleted that when he does charge it with several slugs they chill the metal in the pot which is not of suflicient volume to melt them up quickly, with the result that the operation of the machine must be interrupted until these added slugs melt and eommingle with the molten metal already in the pot, or if work on the machine is con-' tinued too quickly the characters produced by it are not perfect. The present invention is designed to take 'this labor entirely off the operator and provide mechanical means tervalsas long more metal is needed, but the charging is interrupted when the consumption of'the molten metal ceases.

The primary features or essentials of this machine include the pot itself, a chute leading thereto, a magazine leading to the chute.

an interrupter for throwing said mechanism out of action when the molten metal in the pot rises to a certain height.

The secondary features or refinements of this invention include the charge forming and feeding devices within the chute, one of the pot will not become chilled, a peculiar Specification of Letters Patent.

Patented July 9, 1912. 1912. Serial No. 687,765.

more fully described and claimed, and as shown in the drawings wherein-' Figure 1. is a side elevation of the entire machine with the parts in one position, and Fig. 2 a similar elevation of the actuating mechanism and interrupter with the parts in a second position. Fig. 3 is an elevation similar to Fig. 1 excepting that the magazine is here in section, the parts being in a third position will be explained in the following specification. Sheet 3'of the drawings is devoted mostly to details of the pot and the chute leading thereto. Fig. 4 is a vertical longitudinal section through the pot and chute and the outlet end of the magazine, the pot being swung forward from the position illustrated in Figs. 1 and 3; Fig. 5 is a section on the line 55 of Fig. 1; Fig. (3 is a horizontal section on the line G(3 of Fig. 1; and Fig. 7 is a perspective detail of the heat retainer. Sheet 4 illustrates more particularly the follower which feeds the stock along the magazine. Fig. 8 a plan view of the magazine with the follower therein: Fig. 9 is a scctiqn on the line El -t) of Fig. 8; Fig. 10 is a perspective detail of the follower removed and Fig. 11 is a vertical sectional view through the pot and lower end of the chute, showing a slight modification.

In the drawings the pot 1 is conventionally shown as suspended by a chute 2 which is pivoted at 3 to the delivery end of a magazine 4 from which the stock or slugs S are fed by means of a follower 5, and the latter or slugs in charges to the pot, and this mechanism includes a heat retainer 1'2 so that the pot will not become cold when it receives a new charge from the chute. Fi-

.nally, a specific form of step-by-step inccha nism 13 is by preference employed in conjunction witlrthe follower 5 so that it progresses forward automatically as the rod (3 is reciprocatcd but may be set back by hand at any time. These various mechanisms will now be described severally in detail in the Y form in whichl prefer to make them, and later their coaction will appear in the description of the operation of the entire ma chine.

The pot 1 is conventionally illustrated herein as having a top 14 which is closed except for the opening 15 through which the. lower end of the chute 2 passes and in which it is secured, a slot 16 extending to the rear from said opening for a purpose to be set forth below, and a hole 17 through which passes an insulated plug 18 whose lower extremity is bared within the pot at a point above which it is not desired that the level of the molten type metal shall rise. 1 have not considered it necessary to show the means for heating the pot nor for delivering the molten metal therefrom, as the same forms no part of the present invention and are Well known in linotype machines. Ordinarily this pot swings forward (or to the right as seen in Fig. 1) periodically. and the mechanism for imparting such movement thereto is also omitted as forming no part of the present invention.

The chute 2 in the simplest form of my invention rises from the large opening 15 in the top of the pot and is supported on a pivot 33 beneath the delivery end of a magazine 1-, the chute and pot being held in their normal position by means of a con tractile s 'iring 30.

The magazine 4 is herein illustrated as a trough-like structure having its delivery end slightly elevated above a horizontal and pro vided along its bottom with a longitudinal groove 40 as best seen in Fig. i). "the rod ti lying and reciprocating in this groove and tendingto move the follower 5 forward or upward along the magazine by a step-h)- stcp action so that the stock or slugs S may he pushed along the n'mgazine and dropped one by one into and through the chute and by it delivered into the pot.

The actuating mechanism for causing thircciprocations ol' the rod .3 inchz-rlc a level 1 t the clcciriunaguet pot continues.

7 pivoted at T0 to the framework 01 the machine and having its upper end forked as at 71. with the arms of the fork standing astride the lower end of the rod (5 and be tween two stops (30 which are fastened thereto. A strong spring moves this end of the lever and the rod in the direction of the arrow. Below its pivot it) the lever is bent in an elbow T2 and its lower end H projects forward beneath the magazine 4 and this carries a roller 73 resting on a cam 8 which in turn is mounted on a shaft driven by the linotype mechanism in the direction of the arrow and at a proper speed. This cam has a high face 81, dropping at its rear end 82 into a low face 89 and the latter rising again as at 81 into the other end of the high face as shown.

The interrupting mechanism essential! includes a hook 90 on the lever 7 whose bill 91 coacts with the bill 92 of a dog 93 pivoted at 94 to the frame and with its body stand ing parallel with that: of the hook when the nose 95 at the upper end of the latter rises past the pivot 94 of the dog as seen in Fig. 1. When the hook descends as the lever falls, however, a spring )6 turrs the dog on its pivot 94 so that its hill 2);: is moved out from under the bill 91 of the hook J0, as seen in Fig. 3 and the interrupter is out of action. But for holding the dog to its work, the armature 97 of an elcctro-magnet 98 is ein iloyed, and thismagnet is in circuit through wires 99 with a suitable source of electrical energy and the pLug 18 in the pot 1, as diagrammatically illustrated on Sheet 2 of the drawings.

The operation of a machine which includes only the primary features of my invention thus briefly described. is as follows: As the cam 8 revolves its high face 81 raises the roller T3 and its low face 83 permits this roller to fall, thus raising and lowering the lower arm of the lever 7 and causing the fork 71 at its upper end to reciprocate the rod 0 within the groove in the bottom of the magazine and feed the follower t} forward by a stephy-stop motion. This causes the stock or slugs S to drop out the front end of the magazine through the chute 2 into the pot 1, and the molten metal therein is therefore charged by the addition of new material at inter als. As the lower arm of the lever T rises and falls its hook 90 first swings the dog to the position shown in Fig. 1 as; it ascends, and then permits the dog to swing out of such lposition when the hook descends as shown in Fig. 3. and thus the interrupting mechanism is idle as long as there is no current flowing through the wire 9.). and the feed of the slugs to the But when the molten metal within the pot rises to a point where a circuit is ilosed thriuigh ilutip of the plug tlt ienergized and its armature 97 rises the next time the dog swings inward to the position shown in Fig. 1 so that the arn'laturc assumes the position shown in Fig. 2 and checks the disengagement of the bill 9). of the dog from beneath the bill 91 of the hook, and thereafter when the low face 3 of the cam comes under the roller 73 the lever cannot drop and the reciprocation of the rod 0 is interrupted. Contin'ued use of the molten metal from within the pot will soon cause its level to fall again, however, and as soon as the circuit is broken the armature 97 falls to the position shown in Fig. 1 and the interrupter is out of action so that the lever resumes its rockin movement around its pivot 70 and the feed of the slugs there fore again takes place. Thus it will be seen that the primary features above referred to will cause the machine to automatically feed more material to the ot when the level of the molten liquid therem falls, but when it rises the actuating mechanism will be in terrupted through the completion of an electric circuit whereof the details of its Wiring are not important and are diagrammatically illustrated on Sheet 2 for the purpose of better showin 1 how one of the wires of such circuit may led through a circuit breaker so as to automatically conserve the electrical energy which might otherwise soon become depleted. The details of this circuit breaker and of the other secondary features of my invention which are by preference employed to carry out the general idea will now be described. I

The circuit breaker I0 consists essentially of an L-shaped lever 100 whose pivotal support 101 is insulated from the framework of the machine, whose angle carries an insulated shoe such as a fiber roller 102 adaptedto travel on the face of the cam 8, and whose lower extremity carries a point 103 which isheld off the high face of the cam when the roller 102 rests thereon as seen in Fig. 1 but which is adapted to drop into and make electrical contact with the face of the cam when the latter stands in the positions shown in Figs. 2 and 3. In the wiring shown diagrammatically in Fig. 3. the body of the pot is grounded or connected with the framework of the machine as at G. the axis of the cam is grounded as at G", and one side of the electroamtgnet 98 is capable oflieing grounded as at G through a switch G". \Vith the latter standing in the position here shown, a circuit is completed from the ground (l through the switch G and electro-m'aguet 98, thence along the wire 99 and battery and through the plug 18 and metal in the pot to the ground at G, and

the action first described above will take place. If the switch tongue G" is thrown onto the point G however, the ground G is cut out and the circuit is completed from the electro-magnet 08 through the wire G and into the lever 100 of the circuit breaker. \Yhen the parts stand as seen in Fig. 1 the contact point 102% of the circuit breaker is raised above the face of the cam S and the circuit is broken: as the cam 8 turns to the position shown in Fig. 2 the insulated roller 102 passes down the drop 82 of the cam and the point 1053 comes in contact with the high face 81 thereof so that the circuit is closed, and the armature 97 will rise behind the lower end of the dog and hold the bill of the latter engaged with that of the hook so as to interrupt the movement of the lever and the feed of the follower 5; the cam continues to turn until the drop 82 reaches the position shown in dotted lines in this view, when its face passes from under the contact point 103 and the circuit is again broken; the cam continues its movement with the lever 100 resting against a stop 105 on the frame and the lever 7 supported by the engagement of the bills 91 and 92; the cam continues to rotate until its rise 84. strikes under the insulated roller 102, when the lever 100 of'the circuit breaker resumes the position shown in Fig. l and the circuit is broken; and next this rise pisses under the roller 73, when the lever 7 resumes the position shown in Fig. 1 and the bills of the hook and dog are disengaged and the latter may swing because the armature 07 has not dropped out of the way. The parts are held in this position while the high face .81 of the cam travels around to the position shown in Fig. 1, where the operation is resumed and repeated in the manner just described. Thus it will be seen that the specific construction of the circuit breaker is such and the location of its operating roller 102 with relation to the cam is such that a circuit is completed only momentarily through this device and therefore very little of the electrical energy is used. The completion of the circuit occurs just before the lever 7 begins to descend and therefore while the interlocking bills 91 and 92 are yet in the position shown in Fig. l and the arma ture 97 may rise to interrupt the movement of the actuating mechanism. If at thistime the molten metal in the pot. is high enough to complete the circuit through the plug 18, the completion of the circuit through the circuit breaker will move the armature, and the interrupter works as described; but if at this time the molten metal in the pot is out of contact with the tip of the plug (or in fact if at any time it is out'of contact with the plug) no circuit. can be completed, the armature 97 cannot rise, and therefore the interrupter cannot work. \Vhile it will be obvious that one pole of the electro-magnet 98 could be connected directly with the circuit breaker lever 100 as indicated in dotted lines at G, in the diagrammatic wirthrough a switch for the purpose of indi-.

eating a possible arrangement by means of which the operator could cut out the circuit breaker at will.

The charge forming and feeding mechanism best illustrated on Sheet 3 of the drawings \\ill by preference be employed in connection with the chute described above. li oted at 21. to the rear wall of said chute is a depeiuling arm 22 extending down 'ard through the slot 16 in the top of the pot 1 and carrying a shelf 23 at its lower end projecting forwardly under the lower end or mouth of the chute so as to normally support several of the slugs as seen in Fig. 3. and said arm is held against. the back of the chute by a spring 2t coiled around a rod 25 projecting from the chute and having a head 20 at its r ar end. Beneath the pivot 21 a link of some kind such as a short piece of chain 27. connects the arln 22 with a fixed support such as the framework of the machine. It follows from this construction that when the chute and pot swing forward as shown in Fig. l the link holds the arm 22 and its shelf 2 against such move ment. and the rear wall of the chute moves over the shelf and drops the charge of slugs into the pot as there illustrated. In order to retain the heat within the pot as far as possible. the arm 22 is provided with a lip 28 which stands over and normally closes the slot 16: and within the chute is disposed a heat retaining plate ill (see Fig. 9:) whose upper end 32 is preferably hooked over the front wall of the chute as indicated in Fig. 1 and whose lower end 311 bears 'ieldingly against the rear wall thereof so that the falling slugs are guided onto the shelf 23 as shown in Fig. 3. The action of this ehargoforming mechanism will be clearly understood without further amplification, and it will be seen that the lip 28 and plate tl hereof serve the additional function of preventing the escape of h at from within the p t which might cool the latter to an unch-sirable extent.

The step-lrvstcp mechanism bv means of which the follower S is caused to travel progressivelv and intermittently along the magazine I is best illustrated in Sheet l of thedrawings which shows my preferred const ruction thereof. The follower proper has a flat base 50 slidable upon the flat bottom ll of the magazine between its upright side walls 42 and 4-3. and the base is notched at its rear end as shown at 51. From the base at. one side of its notch rises a longitudinal web 52 whi h races the face of the f llcwer 5 as best seen in Fig. 8, and this web is bcveled across its rear edge as at nil. H nged to said rear edge as at Ft a dog or retaiu-- ing member c nsisting of ti l l'al plate having an upright llfllt h m; in its out r end which is drawn into biting engagement with the left edge 42 of the magazine by means of a spring 57 and which thereby prevents the follower from moving backward down the magazine except when this dog is turned by pressure on its inner end as will be un derstood. livoted at ll to one side of the web .72 is a pendant finger 45 having in its lower end an eye 46 loosely embracing the rod (3. but swung forwardintobitingengagement therewith by means of a spring 47. I have shown this finger as standing upright because the rod is located in a groove which is here illustrated as in the bottom 41 of the magazine =l, but it is clear that if the groove were otherwise disposed the finger would be correspondingly placed. The idea is that the eye in this finger has the same biting engagement with the reciprocating rod as the notch 56 in the dog possesses with respect to the upright wall 42.0f the magazine. 'hen now the rod is reciprocated. its movement in one direction causes its engagement with the finger 43 to feed this follower 5 upward aiong the magazine 4, and the move, ment of the rod in the opposite direction draws it idly through the eye in said fingerwhilc thenotch in said dog at this time prevents a rctr grade movement of the follower in a manner which will be clear. Vhen it desired to remove the follower from the magazine it is only necessary to press the outer or lower end of the finger to the rea and the inner end of the dog for- 'ard which can be done by grasping these two members between the finger and thumb, and then slip the entire deviceup the magazine so that the eye in the finger slides off the upper end of the rod: and when it is desired to set the follower back to its origi- -nal position at the lower end of the magazine. this course is followed so as to throw both biting engagements out of action, and the follower simplyflnoved backward down the magazine. 'lhereaftcr slugs S thrown into the latter in front of the follower I will be automatically fed into the chute and delivered to the pot in a manner described above.

Thus it will be seen that the addition of the secondary features or refinements enhance the value of the machine as a whole for the following reasons: A circuit breaker of the specific type described operates well in conjunction with a cam having high and low faces for moving a lever, and the location of the circuit breaker just at a point where it closes the circuit ata time immediately preceding the movement of the lever is esrciltial where an interrupter of any character i us d. if it were not for the interrupt r. it is obviou that the machine might t cctl 17:11:1 to k to the pot than desirable. and if 'the operator were required to watch an) feature of the device one object of this the elfective action of sai invention would be defeated. \Yhile the obvious purpose of the circuit breaker is to save the consumption of electrical energy, its construction and disposition is such that the electric current flows through the magnet exactly at the proper moment as has been described. \Vithout the charge forming and feeding devices the slugs delivered oil the outlet end of the magazine would drop into the pot, but with the use of the same the size of the charge may well be regulated by adjusting the length of the chain or other link which is shown at 27. Moreover this construction of charge forming and delivering device serves well as a vehi cle for the lip 28 and plate 31 which close the outlet from thef, pot and therefore retain the heat therein. Finally the specific construct ion of the follower with its finger and dog permits its successful use with any magazine or a chute which stands nearly horizontal and in connection with a reciprocating rod, and still permits its adjustment thereon when desired or its removal When it becomes necessary. However, I do not Wish to be limited to the precise details of construction. either in the primary or the secondary features of this invention, nor to the sizes, shapes, proportions and materials of parts or the use of all of them 'simultaneously. For instance, although I have shown and described the pivoted arm 22 as projecting through a slot 16 in the top of the pot and carrying a lip 28 normally closing said slot, it is not absolutely essential that this arm project into the pot as it might extend part way across the chute at a point higher. as illustrated in Fig. 11 and if this construction were followed the slot 16 and lip 28 might be omit-ted.

\Vhat is claimed as new is:

1. In a pot charger, the combination with the melting pot, a substantially horizontal magazine delivering the stock thereto, a follower in the magazine, and a rod for feeding the follower forward; of a pivoted lever having one arm connected with said rod and its other arm standing substantially horizontal. a cam for raising the last-named arm periodically. yielding means for depressing it, and means actuated by the volume of} molten metal within the y t for controlling I 2. In a pot charger, the ombination with the melting pot, a magazin for delivering the stock thereto, a follower in the magazine, and actuating mechanism for moving the follower toward the outlet end of the magazine intermittently; of means for interruptmg the movements of said mechag nism, and means actuated by the volume of the molten metal within the pot for throwing the interrupter into action.

3. In a pot charger. the combination with the melting pot, a substantially horizontal n'lagazine delivering the stock thereto, a follower in the magazine, and actuating mcclr anism for feeding the t'ollower forward intermittently: of means for interrupting the movements of said mechanisn'i, and an electric circuit closed by the rise of the molten metal within the pot for throwing the interrupter into action.

i. In a pot charger, the combination with do melting pot, a substantially horizontal magazine delivering the stock thereto, a follower in the magazine, and a rod for feeding the follower forward; of actuating mechanism for moving said rod, means for interrupting the movements of said mechanism, and means actuated by the volume of the molten metal ithin the pot for throwing the interrupter into action.

3. In a pot charger, the combination with themelting pot, a substantially horizontal magazine delivering the stock thereto, a follower in the magazine. and a rod for feeding the follower forward; of'actuating mechanism for moving said rod, means for interrupting the i'novements of said mechanism, and an electric circuit closed by the rise of the molten metal within the pot for throwing the interrupter into action.

4'). In a pot charger. the combination with the melting pot. a trough-like magazine ris ing slightly toward its delivery end and adapted to deliver the stock to the pot, the

magazine having an internal longitudinal groove, a rod extending along the groove, a follower slidably mounted within the magazine. and step-by-step mechanism connecting the follower with the magazine and rod; of actuating mechanism for reciprocating said rod so as to feed the follower forward intermittently, means for interrupting the movements of said mechanism, and means actuatcd by the rise of the molten metal within the pot for throwing the interrupter into action.

7. In a pot charger, the combination with the melting pot, a trough-like magazine rising slightly toward its delivery end and ada' ed to deliver the stock to the pot. a rod ext Eng along the interior of said trough. a twhoivcr slidabl; mounted within the lat tcr. and step-lrv i c me hanism connccting the follower with the magazine and rod: of actuating mechaninu for reciprocating said od so as to feed the follower forward intermittently, means for interrupting the movements of said mechanism. and an electric circuit closed by the rise of the molten metal within the pot for throwing the interrupter into action.

2-4. in a pot charger. the combination with the melting pot. a magazine for delivering the stock thereto. a follower in the maga of a pivoted lever having one end forkcfl and disposed astride the rod between its, stops. a spring moving this end of the lever in one direction, means for swinging its other end in a direction opposed to thel action of said spring. means for interruptl ing the swinging movements of said lever. l and means actuated'bv the rise of the molten t metal within the pot for throwing the interrupter into action.

it. In a pot charger. the combination with t the melting pot. a magazine for delivering the stock thereto, a follower in the magazi c. a rod for feeding the follower forward inttnanittently. and spaced stops on said rod; of a pivoted lever having one end disposed adjacent the rod between its stops, means for swinging its other end, means for interrupting the swinging movements of said lever. and an electric circuit closed by the rise of the molten m tal within the pot for throwing the interrupter into action.

10. In a pot charger.the combination with the melting pot. a magazine for delivering the stock thereto, a follower in the magazine, a rod for feeding the follower forward. and actuating mechanism for reciprocating the rod including a pivoted lever and means for swinging it intermittently; of a hook fast on the lever, a pivoted dog turned into the path of the hill of said book by the movement of the lever in one direction. a spring for retracting the dog as the lever moves in the other direction. and means con trolled by the volume of molten metal within the pot for nullifying the action of said spring.

11. In a pot charger, the combination with the melting pot, a magazine for delivering the Stock thereto. a follower in the magazine, a rod for feeding the follower forward, and actuating mechanism for reciprocating the rod including a pivoted lever and means for swinging it intermittently: of a hook fast on the lever, a pivoted dog turned into the path of the bill of said boot; by the movement of the lever in one direction. a stop adapted to move behind the dog when the latter stands in the path o ntlltl bill. and means controlled by the rise of the molten metal within the pot for moving such stop into operative position.

12. -ln a pot chargctgthc combination with the melting pot, means for feeding the stock thereto. and actuating mechani m for the feeding means including a pivoted lever and a cam for swinging it intern'tittently; of a hook rising rigidly from the cam and having a nose above its bill. a dog pivoted along 5 side the path of the hook and having, a bill at its lower end adapted to be moved under the bill of the book when the nose f the latter l'ifics above the pivot. of the d g. a

apring for moving the dog in the op osite direction as the lever descende, and mean controlled by the volume of molten metal within the pot for nullifying the action ofsaid spring.

1?). In a pot charger,the combination with the melting pot. means for feeding the stock thereto, and actuating mechanism for the feeding means including a pivoted lever and a cam for swinging it intermittently: of a hook rising rigidly from the cam and having a nose above its bill, a dog pivoted alongside the path of the hook and having a bill at its lower end adapted to be moved under the bill of the hook when the nose of the latter rises above the pivot of the dog, a spring for moving the dog in the opposite direction as the lever descends. an electromagnet whose armature stands behind the dog. and an electric circuit cloqcd by the rise of the molten metal within the pot for energizing said magnet and raising the armature into bill engaged with that of the hook.

1!. in a machine of the classdescribed. the combination with a cam, a pivoted lever having a-roller re ting on such cam, and a hook rising rigidly from the lever and having a downwardly facing bill and an up-' wardly extending nose: of a dog pivoted between its extremities alongside the path of the hook and having a bill at its lower end adapted. to pass under the bill of the hook and an arm at its upper end with which saidnose contacts as the hook rises. a spring thrmving the arm in a direction to disengage said billS'. an electro-magnet behind the dog, and an armature therefor whose tip is adapted to rise behind the lower end of the dog when the artnature is energized, all as and for the purpose set forth.

1?. The combination with a substantially htn'izontal trough having a longitudinal groove in its bottom. a iod nvithin said groove. and means for recipro ating it: of a follower Whose body includes a notched base and an upright web. a finger pivoted to the latter and having an eye in its outer end, a spring turning the tinger in a direction to throw the eye into biting engagement with the rod. a dog hinged to the web and having a notch engaging one edge of the trough. and a spring turning the dog in a direction to throw it into biting engagement therewith.

H1. in a pot charger for linotype machinesj. the combination with the magazine, and means for feeding slugs ut of the same intermittently: of a chute hinged under the delivery end of the magazine, a melting pot nto which the .hute delivers. and a springguiding plate s cured at its upper end to one wall of the chute and having its body inclining acros the interior of the latter and resting against the opposite wall thereof. for the purpose et forth.

lTt lo a pot charger for linotype machines. the ombination with the magazine,

position to hold the dog with its and means for feeding slugs out of the same intermittentlyyof a chute hinged under the delivery end of the magazine, a melting pot into which the chute delivers, a spring-guiding plate secured at its upper end to one wall of the chute and having its body inclining across the interior of the latter and resting against the opposite wall thereof, a charge forming and feeding device carried by the chute below the free end of said plate, and means for moving it periodically with relation to the chute, for the purpose set forth. i

18. In a pot charger for linot-ype machines, the combination with the magazine, and means for feeding slugs out of the same intermittently; of a. chute hinged under the delivery end of the magazine, a melting pot whose top has an opening through whlch said chute delivers, an arm pivoted to the Mr wall of the chute, a shelf at the lower end of the arm projecting part way across the chute, yielding means for holding the arm normally in contact with the chute, and

" a link connecting said arm with a fixed support, for the purpose set forth.

- 19. In a pot charger for linotype machines, the combination with a chute hinged to a fixed support and its lower end adapted to swing aside, and a melting pot whose top has an opening through which saidchute delivers; of an arm pivoted to the rear wall of the chute and carrying a shelf projectwith its free end normally contacting with the inner wall thereof above said shelf, as and for the purpose set forth;

20. The combination with a cam having high and low faces, a lever having a roller resting on the cam face, mechanism actuated by the rise and fall of said lever, and an interrupter adapted to hold the lever raised when the high face of the cam moves out 7 from under its roller; of electrically-actuated mechanism for throwing the interrupter into action, the circuit of said mechanism leading through the cam, and a circuit breaker consisting of a lever whereof- 0m end is mounted on an insulated sulppo rt and. er, .end is is included in such circuit, the ot adapted to contact with the cam face; and between said ends the lever carries a shoe of if, .msulatlng material which said cam fade engages before it engages the roller on said other lever. I I In testimony'whereof I have hereunto set my hand in presence of two subscribing wit-;

nesses.

EDWARD EVERETT SPENCER. Witnesses: i Y

CHARLES A; URNER, ALPHEUS F. CorPINs.

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