US1008406A - Portable furnace. - Google Patents

Description

M. DAVIS.

PORTABLE FURNAGB.

` APPLICATION FILED BBPT-1, 1911. 1,008,406.

Paten-ted N0v.14, 1911.

5 SHEETS-B HEBT 1- ATTORNEY.

M. DAVIS. vPORTABLE PURNAUB. ABPLOATION IILED SEPTQI, 1911. 1,008,406 A f Patented Nov. 14, 1911;

` f 5 SHEETS-SHEET 2.

M. DAVIS. PORTABLE fnnmc. AYPLIOATION FILED BEPT. 1, 1911.

Patented Nov. 14, 1911.

\ y 5 BHEETSBHBBT 3.

1N VEN T oR. /Herr/'l/ Da v/,s

WITNESSES.- l l C mA/MM A Y v ATTORNEY.

M. DAVIS. PORTABLE FURNAGE.

APPLICATION FILED SEPT. 1, 1911.

`1,008,406. Ptented Nov. 14, 1911.

s sums-*snm ,4.

WITNESSES f f INVEN TOR.

F'ATTVORNK M. DAVIS.

PORTABLE FURNAGE. APLIGATIox FILED snm. 1, 1011.

Patented Nov. 14, 1911.

s ausm-sum 5.

INVENTOR.

Y Merrill Dar/3 BY MMM ATTORNEY.

UNITED sTATEs PATENT oEEioE.

Mannini. Davis, or Wa'rEn'rowN, NEW Yoan, assxeNoa 'ro Jamas n. wiszi, or

. wA'rEarowN, -Naw Yoan.

Poa'rAnLE FUnNAcE.

Bp'ecmoation o! Letters latent.

Patented Nov. 14. 1911.

To all whom 'it may concern.'

Be it known that I, MERRILL Davis citizen of theUnited States, residing at Watertown, in the county of Jefferson and State of New York, have invented certain .new and useful Improvements in Portable Furnaces, of which the following is a specification.

This invention relates to improvements in portable furnaces, designed for use in meltmg various kinds of metals, the furnace being tiltable and rotatable for pouring the metal directly into the molds'.

The invent-ion relates particularly to improvements in the devices shown and described in m former applications, filed respectively, arch 30, 1911,. Serial No. 617,874, and July 13, 1911, Serial No. 638,296.

The object of my invention is to provide a tiltable' and rotatablefurnace for melting metal, which may be readil `trans orted from place toplace, and which carries its own heating a cnt.

A further ojectis to provide a furnace which is adapted for pouring the molten metal directly into the molds, without disturbing the fire, or requiring the rehandling of the metal.

A further object is to provide a plurality of'siinultaneously actuated hoisting devices for supporting and elevating the fu'rnaoe.

A further objectis to provide adjustable means for varying the axis upon which the pouring spout of the furnace rotates, so as to deposit the metal atdifferent points successively,` without disturbing the furnace or -its operating parts,

A further object is to provide s imple means' for effecting the automatic raising 'of the pouring spout during the final pouring operations, for the purpose of feeding the molds. And a' further object is to provide means capable of manual, and also automat-ic operation, for cont-rolling the hoistin devices.

he various features and parts of my invention will be described in the subjoined specification, illustrated by the accompany# ing drawings, and then particularly pointed out inthe appended claims. Figure 1 is a top plan view of the4 device; showing the furnacein erect position' ready for charging andfiring. Fig. 2 is a front elevation of the. same. Fig'. 3 is a right side 'elevation of the 'furnace 1in erect position.

pourin Fig. 4 is a ri ht side elevation; showing the furnace tilte for skimming the metal preparatory to pouring the same into the molds.

1g. 5 1s a similar elevation; showing the furnace in elevated position; also showing the methodv and means for elevating the curing spout during the pouring operation.

1g. 6 is a view similar to Fig. 5;\showing furnace in elevated position; also showing the method and means for shifting the pouring spouthorizontally for depositing the metal at different points. Fi 7 is a central longitudinal section throug one of the hoisting devices. Fig. 8 is a cross-sectional view of the valve which controls the hoists; the valve being closed. Fig. 9 is a similar view; showing the valve open. Fig. 10 is a similar view; showing thevalve reversed for exhausting the air pressure from the hoists.

Similar characters of reference are assigned to corresponding parts throughout the several views.

After devising and putt-ing into practice my former furnaces referred to in t-ie said applications, I found that the provision of a fixed, unvarying point from which the melted metal is to be poured, had the effect to limit the said furnaces to but a few classes of foundry work, where it is desirableto pour the metal direct from the crucible into the molds, a'nd that one or more .important branches ofthe casting business, as 4it obtains in the rollin -mills, could not be handled by the said urnaces, principally because of the feature of the fixed point for the met-al.

In ro ling-mill practice, the rods or ingots from whichl wire and tubes are formed, Iare cast in iron'molds which are placed in substantially vertical position, and the molten metal is poured into the top ends of the molds. These ingots are usually of comparatively small diameter, and quite long, and the melted metal must'be cured into the molds as rapidly as possib e un til the molds are full. Should the pouring oper-ation be sto edl when the molds are full, a

.crust Woul immediately form over the tops, and the rapid shrinking of the metal would causel flaws and cracks or initial strains, which would render the in ots unfit for use. This tendency is overcome ya rocess commonly known as feedin w ich-will be brieiy described: When t e. mold has been- 25 said adjustment may be effected either bechamber 15. The gland 1 poured full, the llow of the metal is sudby a common shaft 12, which is journaled ir denly reduced to a stream about the size of a and supported by suitable bearings 13 formcommon leady pencil, which is allowed to ing parts of the end portions 14 of the truck gravitate into the top of the mold. At the frame, in such manne rthat the hoists A and 5 same time, the oint or spout from which the A may oscillate slightly during their operametal is poured) is raised to a greater hei ht, tions. in order to give this small stream sullicient Fig. 7 illustrates the construction, arvelocity to continually break through the rangement and operation of one of the hoistcrust which rapidly forms on the to of the ing devices, which will now be described: 10 poured metal. The size of this eedin The cylinder 10 telescopically fits over the stream is regulatedby the rate at which 51e plun er 11, there being a clear space or metal in the mold shrinks or contracts, and hamer arranged between these arts, when the shrinking and contracting has which is` intended to be normalll7 fille with ceased, thepouring is stopped. This c0ndi oil'or other suitable liquid for raking and 15 tion and requirement, I have found, renders steadyingthe cylinder 10 during its reciproa furnace that pours the metal from a fixed eating movements. A suitable packin 16 is point useless for this class 'of rolling-mill disposed within each end of the cylin er 10, work. To this end, I have redesigned the for preventing the escape of the oil from the furnaces of my former ap lications, and chamber 15,. Any suitable means may be 20' have pro'vided means where y the pouring employed for compressing and holdingy the vspout may be moved horizontally and also packing 16 in lace, but the lower packing vertically within a certain range, for depos- 16. is preferabi;r provided with an upper iting the melted metal at different points, as gland 17, which comprises a tubular part, Well as, ,from a higher level or plane, and the the upper end of which rojects into the 7) is'so arranged, i fore', or during-the pouring operations, withthat when the cylinder 10 moves upwardly out in any way interfering with the pouring over the plunger 11 the said gland forces of the metal. The adjusting parts may also the `oil in the chamber 15 through a. port be set,to cause automatic vaction of the pour- 18, into an inner oil chamber 19, which is ing-spout controlling-mechanisms asthe difvformed in the plunger 11. Both ofV the 9 l held in place by any ,suitable means. plunger. The tube 20 ferent: periods or stages` ofthe pouring operchambers 15-and 19 are intended4 to be filled lations are reached, and the degree oi' ran e to their capacity with a heavy oil, the oil of the said variations can be instant y being supplied in the first place by means of changed to 'meet unexpected requirements or a threaded hole 1-5.' in the cylinder 1.0,whicli 35 miscalculations. is then closed by a screwlug 15". Thel 1( The furnace comprises a hollow cylindri plunger 11 is -preferably hollow throughout c cal outer body or shell 2, in'which is disits entire length, and its interior is lined posed a crucible or melting-pot 3 ,which may with a tube 20, which is preferably fitted follow theisual construction, and may be liquid tight into the o posite ends of the 4rms the inner side 10 4 re resents a curing spout, which is of the oil chamber 19. Below the tube 20, prefera l attached) to the top of the body 2, the opening through the lu'n er is closed at onesi e-of the crucible,'in position to reby a plug 21,' which is hel tig tly in place lceive the contents ofthe 'crucible when the -by a screw 21', the said plug having an lipfurnace is tilted. The crucible is preferwardly projecting nozzle-like part 22, which 1 11 ably disposed centrall in the body 2, and is. lis bored out for carrying oil into the interioi'- surrounded'by a com ustion chamber 5, in -of the tube 2O during the operation of the which an'y suitable fuel, such as gas, oil or hoist. Within the tube 2O is disposed. 'a coke may be placed-and burned for heating piston 23, which .is provided with a pack- 5.o the furnace. g The fuel may be burned under ing 23', which is compressed between a 115 natural or mechanical draft, applied in any gland 24 and a flange 25. 26 represents the suitable manner.v piston rod, the lower end of which connects The self-contained furnace is litted with to the piston, while the upper end is adtrunnions 7 and 7, whichl are preferably justably connected to a cap 27, which is vrigidly attached to the op osite -outer sides :secured to the upper end of the cylinder 10 120 of the body 2, by means o which the entire by bolts 27 The upper end of the rod 26 weight-ofA the'furnace is supported. AEach is threaded. for receiving an adjusting-nut of thel trunnions is journaled in bearings 28. 29 represfents a tube which surrounds which are formed in like integral perforated the piston rod, its lower end bearing upon l 6o lugs or projections 9, of the outer movable thev gland 24, the upper end of said tube in- 125 members 10, of a pair of hoisting cylinders tertting with the underside of the cap 27. A and A', which reciprocate on inner mem- The arrangement of these parts is such that,

bers or plungers 1'1 of the lioists.l The -when t e nut 28' is screwed down on the rod `plun'gers'll extend below the lower ends of 26, the piston is ra sed, and owing to the the cylinders 10 and are pivotally supported presence of th'e tube 29, which bears against 130 plunger 11 and at the same time the g and 17 in the ottom of said cylinder moving upwardly in thejchamber 115, msplaces the 011 thereinand forces it throu h the port 18 into the chamber 19. The oil being incompressible, must have" an outlet from the chamber 19, which is already full ofthe fluid, and for this purpose, I provide a ort 33 at the bottom of said chamber, w iich connects with a pipe 34, which carries the oil to the valve 32. The oil then passes through the valve `32 and returns by Way of a` flexiblepipe 35 and renters the lowerV end of the plunger 11, by way ofa port 36, which extends through the wall of the plunger and into the 'lug 21, whereit risesin the nozzle 22. T e" nozzle 22 is disposed in a i hollow part 36 of the piston 23, the outside of the nozzle is formed ta ering, and the whole of `this part is smaller in diameter than the chamber 36 of the piston, so that the oil flows freely out of the top ofthe nozzle, thence ldownwardly into a small chamber 37 disposed below the piston 23. v As soon as thecylinder 10 begins to move up-v wardly, thechamber 37 increases in depth, and this space is immediately filled with the oil which has been displaced from the chambers 15 and 19. The space between the plug 21 and the piston 23 which comprises the chamber 37 is intended to be exactly proscent of the cylinder 10. The speed at which the cylinder 10 may bel raised or lowered is.

regulated by the arca of -one or all of the.l several ports or passages through which the oil must flow in passing to and from the chambers 15 and 37. By the use of the oil, as described, the `hoists are always kept under complete control, and the rate of travel of the cylinders 10 is at all times governed by the rate of flow of the oil.A

The valve 32 which controls the hoists` will now be described.

40. represents .the outer casing or shell of Kthe valve, in which is rigidly `lng 41, which is bored .outtapering telit the tapering plu 42. The said plug is pro-` vided with a cy indrical portion 43, which` -nism of the seed@ bufalis preferably fitted tightly into one end of a hnk 44, the outer end ofthe part 43 then passes loosel through and pivots in the upper end o a lever 45, the said link and lever forming parts of the elevating me chaurnace. The casing 40 is prov1ded with threaded radial ports or holes a., b, c and d, into which are screwed pipe s 31,

'ressure and oil to and from lthe valve. The ushing 41 isy provided with a number of longitudinal slots or ports a', 7)', c and cl', each of which communicates at or near one end with the ports of the casing 40. The

casing 40 is provided with a laterally, projecting portion 47, which is bored ott to forni a socket to receive one end of an operating handle or lever 48,`by means of which is manually operated. 49.repre` the casing sents a t readed hub formed on the o ppc# site end of the plug 4.2, which' pierces the center of a four-arm spring'- 50, which is held in. place by a` nut 51. The spring 50 is employed for holding the casing`40 operatively 'engaged with plug 42.

The operation of the valve 32 is as fol- 34, 35 and 46, employed for conducting,I air lows: Air (pressure from any suitable source f is supplie to the valve through pipe 46. When the valve parts are in the pos `lt-ion shown in Fig. 8, no air or oil can pass through the valve. When the operator pulls downwardly on the hand-lever "48, the'cas-` ing 40 will be rotated to the left, frorr. the

osition shown in Fig. 8, to that shown in ig. 9, which will bringV the ports a `ard into 'communication with curved passage f of the plug 42, which will allow the air pressure to flow from the vpipe 46 into the pipe 31, to be carried by the latter to the hoisting cylinder A. At` the same-time the air ports are opened, as described, the ports vard d on the opposite side'oi the casing 40g are brought into communication" with ar; irregularly formed by-pass L. in the plug 42, which allows the oil entering the valve through the pipe 34 to pass into thc pipe 35 telescoping parts 10 and 11. To exhaust the air, Lthe operator should swing` the lever 48 to the right suliciently to shift the casing 40 to the position shown in Fig. 10, which llO will close the curved passage f of the plug, and bring the port. b' into communication with a radial passage 1', which connects with a central port k, whichcommunicates with the 'atmosphere4 through the center of the threaded hub 49. lrVhen the parts `are brought into the last position, the air pressure confined in the cylinders 10 of hoists A and A will escape to the atmosphere through the port 7c. At the same time the casing 40 is rotated for exhaust" the air, the o1l ports c and d' will be brought into communication with the by-pass h of the plug 42, which will allow the free passa of the oil from the chamber 37 of the hoist through pipe 35 into the said b pass, thence returning to the chamber 15, y way of the pipe 34, chamber 19 and the port 18. As the air is exhausted, the hoists A and A' will close down gradually, the closing movement, like the opening movement being lated by the rate of ilow of the oil, as 5escribed. In order to provide for the simultaneous circulation of the oil from the valve 32 to both of the hoists, the ipes 31, 34 and 35 are each provided withs 52, towhich are connected branch pipes 31', 34' and 35'; all of the latter p hoist A' in exact y the same manner as is shown for the hoist A.

The truck frame com rises thee'nd rails r parts 14, and the si e rails 14', which may be joined together in any suitable manner.A The truck is provided with four wheels or rollers 53, which are journaled on Vshort gud eons of pins 53', which are embedded 1n t e side rails -14 of the frame. The truckpreferably travels on track-rails 54.

The mechanism for` A'elevating and co-- trolling the furnace consists of the following parts: 55 represents rearwardl projecting perforated lugs carried by cylinders 10 of the hoists, which are preferably located opposite the lugs'9, to which are pivotally connected downwardly extending levers 56, by means of pins 56'. The lower ends of the levers 56 are pivotally connected to like side levers 57, by pins 57. The forward ends of the levers 57 are pivotally attached to upwardly extending portions of the frame 14-14' by means of a common shaft `58, which extends across the/ front of VSaid frame.

When the furnace is tilted from the posi.- tion shown in Figs. 1, 2 and 3 to that shown in Fig. 4, and also during its elevation for pouring the metal, the top ofthe furnace leo -by pins 61', the lower ends of the-levers 61 is supported by two three-arm levers 59, disposed one on each side of the body 2. One arm 59' of the said lever is pivotedto the trunnions 7 and 7. The forward arms 60 are pivoted tothe upper ends of levers -61,

being pivotally connected to the side leversk i 57 by means of a shaft 62,so that the levers ipes connecting with the respondin -f'parallel re ation.

-61' are adapted to move -iipwardly and downwardly with the levers 57.

63 represents the short-upper arms ofthe levers 59, which are slotted at 63' to receive pins 64 and 64', which are made fast to the opposite sides of the body 2, and which slide back and forth vin the saidv slots while the furnace is tilted or rocked on thetrunnions threaded to be screwed onto the pin 64. The, object of this threaded connection is to provide means for locking the furnace body'2 in an desiredy position within the ran e or lengt of the vslots in the levers 59.

and'firing" osition shown 1n Fi 1, 2 an '3, the han -wheel '65 may be tightened to holdV the body rigid in said position, and when the furnace is tilted to the position shown in Fig.- 4, the hand-wheel may again be tightened for new position. The links 44 one of which is connected to the valve 32 and levers 45, extend rearwardly and pivotally connect tothe levers 61 intermediate their ends, by pins 44'. The distance from the centers of the pivots of the links 44 is intended to be the same as the distance from `the center of the shaft 58 to the center of the shaft 62, which connects the 'levers 61 to the levers 57 so that when the saidV partsbare operated during the elevation and lowering of the furnace, the corparts are held and moved in In practice, the molds `into which the metal isto be poured are generally so arrangedthat their pouring vents or sprues come in line alongside and parallel to the tracks 54 on which the furnace is moved from place to place. -It frequently happens, however, that some of the sprues are of smaller diameter, and for other reasons, it is impossible to locate all of the molds so that the centers of all of the sprues will be in line parallel to thesaid tracks, and as the stream of molten metal must flow into .the centers of the molds, it is obvious that means must be provided for adjusting the point -of the pouring spout 4 to suit the differently located sprues. To this end, I have provided an adjustable mechanism, which vcomprises the following parts: 66 represents' vertically disposed levers pivotally supported .by a common shaft 67, which is journaled in the frame parts 14. The lower ends of-levers 66 connect with the lower ends of the levers 45 through rods or links 68, by pins 69 and 69'. 70 represents a screw-threaded rod, the outer end of which carries a hand-wheel 70', the inner end thereof being screwed intoa yoke 71,

en -the furnace is in the upright, -or chargin holding the furnacefin thev 59 and the furnace body 2, inthe manner dotted lines in Fig. 6. The lower ends of,

i lateral movement will be imparted 'to the top ends o'f the levers 61, to which are pivot- `this way" the furnace body may be swung and the spout 4 will at the same' time be `the other movable parts of the furnace durllinks 44 and the levers 57. The operation greater or less distance -above the top of which is pivoted to one of the upright levers 66. The y turning of the hand-wheel 70 in the opposite directions, rocks thelevers 66l correspondingly, and through the links 68 swin the levers on the shaft 58, and there y corres ondingl swings the tops of the levers 61, t rou h t e links 44, from the` position shown in l lines, to vthe position shown in dotted lines, in Fig. 6. The adjusting of the levers 61, as described, also effects the shifting horizontally of the levers and to the extent shown by the full and the levers 61 are journaled -or pivoted to the levers 57, but they are notinuenced by the adjustment effected by the operation of the hand-wheel 70', therefore, an increased ally attached the forward arms of the levers 59, which support the top of the furnace body 2, and control the pouring spout 4. In

forward or `backward from the positions shown in full and dotted lines in Fig. 6,

correspondingly shifted in a horizontal direction. This horizontal adjust-ment will not affect the pouring spout in relation` to ing the pouring operations, and it may be done while the pouring is taking place. The latter `result is due to the fact that each of the levers 61 -must and will at all times travel or rotate on an axis havingthe same radius as that which is controlled by the of the hand-'wheel 70 effectsthe changing of the axis of the pouring spout horizonf tally, while the releasing of the hand-wheel permits the furnace body 2 to be. tilted and set atany angle within the range or length of the slot-s 63', which will change the radius from that of the levers 59 and 61, which will permit the spout 4 to move vertically during the elevating and pouring operations.

y The operation of the furnace" is as follows When the metal to be poured has been sufficiently heated, the furnace is trundled over thetracks 54, toa position opposite the mold 72, and then the body 2 of the furnace is tilted, `preferably by hand; `into the position shown in Fig. 4. The metal is then skimmed in the usual manner and is ready for pouring. In case the point ofthe pouring spout does not come in the right position in relation to the sprue of the mold, the furnace maybe adjusted horizontally by the operation of the hand-wheel as explained. If the spout 4 is required to be elevated for positioning Jthe same at a the mold, this may be yaccomplishedby releasing the hand-wheel 65, by unscrewing the same on the'pin 64.- T he top of the .firnace may be slightly elevated or lowered, by moving the pins 64 and 64"toward or away from the forward ends of the slots 63', as indicated by the dotted lines in Fig.'

5. Then by tightenn up the hand-wheel 65,. the furnace when e evated from; the po sition shown in Fig. 4 to that shown in Fig. .5, will pour the metal from the desiredlev e1. soon as the pouring spout is adjusted to `properly pour themetal into the mold, the operator should grasp the hand-lever 48 attached to thev'alve 32, and move it ':o I

wardthe left, ort; downwardly (see Figs. 5, 6 and' 9) 1n a gradualmanner. This will cause the rotation of the Valve casing 40, `from 4the position shown in Fig. 8, to that shown in Fig. 9, which will establish coinmunication between the pipes 46 andthe pipes 31 and 31', and allow the compressed sto air to flow simultaneously into the cylinders f 10` of the hoists A and A. At the same time, ,the oil ports c-c and d-d andthe by-pass hof the valve will be opened for the free passage of the oil from the pipes 34 -34 to the pipes 35-.35. The air exerting its pressure against the tops of the cylinders 10 of the hoists, will force said cyl- A inders upwardly, while the plungers 11.wlll be held stationary by the shaft 12. The upwardmovement of the cylinders 10, through the connections by means of the lugs 9 with the trunnions 7 and 7 will lift the furnaze from the position shown in Fig. 4 to th it shown in Figs. 5 vand 6, and during this upward'or rotary movement of the furnace and its related parts, the molten metal will flow from the c rucible 3 and gravitate in'o the mold 72. The upward movement of the cylinders 10, through the lugs 55 andthe levers v56 e'ects the upward movement of,y

the rear ends of the side levers 57, which .in turn lift the angular levers 61, to which are connected the forward arms of the levers 59, which are journaled lto the trunnions 7 and 7 travel in like arcs which are fixed by the links 44, owing to their pivotal connections with the levers 45. The levers 59 thus form members of what is commonly known as a parallel motion, onaccount of the radiuscf the links 44, and the distance between the centers 58 and 62 being the same, by which the levers 59 describe the same arcs. The upwardly projecting ends of the levers 61 connecting with the forward arms of the The levers 61 are forcedto` lever's59, are "so disposed' as to travel` in f arcs, the axes of which would normall v` pass through the tip of the pouring spout 4. The continuation ofthe upward `movement.

of the cylinders l0 of the hoists will cause all of the levers just 'described to travel iii f.

ares relative tothe poi'nt of the pouring spout, whether the point is absolutelyfxed or not. If,l at anytime during the pour: ing operation, it is desired to increase the fheight from which the melted metal is to 'relatively to the top wheel 65may be loosened b be poured from the oint of the spout 4 o? the mold, the handunscrewing it on the stud or pin 64, and t e furnace may then be rocked backwardly or forwardly, as the case may be, on the trunnions 7 and 7 during which movement, the ins 64 and 64 will travel in `the slots 63" o the levers 59. Then b screwing the hand-wheel tight 9 to that shown in Fig. 10, whichr will allow vthe air pressure contained in the two hoists to exhaust through the ports and c located in the plug.42. As soon as the air is exhausted, the weight of the different parts, including the object hoisted, as the furnace, will force the cylinders 10 downwardly over the plungers 11 to the closed position shown in Figs. l, 2, 3,v 4,'and also as shown b the full llines in Fig. 7. When the mol has been filled, and the operation known as feeding is commenced, the point of the .pouring spout 4 is raised in a gradual manner a suitable `distance by the following means: In the first place, the furnace bod 2 is released from the locked contact througli the pins 64 and 64', and the hand-wheel 65. with the levers 59, by unscrewing the said wheel, as explained. The furnace ma then be swung on the trunnions7 and 7 to a ynew position, as for example, from the position shown in full, to the osition shown in dotted lines, in Fig. 5, Vw ich shows the point of the spout 4 in a slightly elevated position. As ,the furnace is elevated for pouring the metal, the point of they spout 4 will gradually rise in a true vertical line, and the melted metal will fall into the mold from an increasing height -withV greater force, which is desirable during the feeding operation. The increased force of the gravitating metal will .break through the i Vcrust which invariably forms on t-he top` of .top end of the ingot or casting `will the metal which has been poured, as soon as the casting begins to cool and shrink. Unless thiscrust is kept broken u .the

1mperfect, and unless the so-called feeding operation is carried out until the mold is entirely full, the ingot will be imperfectly.

formed, due to checks and flaws and initial strain, which will render it unfit for use. Theadjusting of the furnace by means of the pins 64 andk64 and the slots63, as explained, will cause the point of the pouring spout, when the furnace is afterward rotated, to move away from the axls or center of the arc described b the tops of the levers 61, which control t e levers 59, and will effect the movement ofthe point of the'spout in an arc around .the said axis as a center, and the radius of this arc will be the distance that the spout has been moved from the axis of the levers 61. This feature is of great advantage, as when pouring molds of known capaclty, this, distance may be regulated and fixed so that when the molds have been filled and the feeding operation is begun, the point ofthe pouring spout will be automatically raised to the desired height without further attention or.

adjustment by the operator. The'subsequentrrotation of the furnace on the trunnions 7 and 7 will not affect or change the axis or point of oscillation last described, which will remain in a position governed by the disposition of the levers 61, which in turn are controlled by'links 44, and the shafts 58 and 62 on levers 57.

73 represents a spring, which connects at one end. b'y vmeans of screws 75 to the valve casing 40, the opposite end being disposed loosel between plns 74 carried by the link 44. hen the casing 40 of the valve is rotated in either direction, the spring 73 is bent (see Figs..9 and 10) and exertsits tension for rotating the casing in the opposite direction from which the operator moved it. The object of the spring 73 is to prevent the air pressure from continuing to operatethe hoists, in case the operator, for any reason, lets go the handle 48, after he has once opened the valve.

.When the valve has been opened by the operator, the air pressure'actuates the cylinders 10 ofthe hoists, and these through `the levers 56, 57 and 61 will lift the link 44,

which is rigidly connected to the plug 42, which rotates with the said link. In case the operator opens the valve part way, by means of the handle 48 and thenholds the `handle still, after a few seconds time, the

link 44 will have moved upwardly with the lever 61, and will rotate the plug of theA valve in the same direction in which the operator turned the casing 40, which will close the valve. In order to prolong the hoisting operation of the hoists, the *operator must continue to Slowly swing the handle 48 and thus keep time with the rotation of the plug 42 and the link 44, otherwise, the

link will close the valve and shut off theair pressure, which will stop the elevating of the furnace.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is-

1. In combination, a tiltable and rotatable furnace mounted on trunnion's, a pair of fluid pressure actuated hoists for supporting and operating the furnace, i an elevating mechanism for rotating the furnace durin the pouring operations, and a valve carried by parts of said elevating mechanism adapted to control said hoists.

\ 2. In combination, a-pair of Huid pres-y -sure actuated. hoists, a rotatable furnace having triinnions journaled to said hoists,

`means for rocking the furnace on the trun mons, a valve for controllingsaid hoists, an l elevating mechanism cooperating with said hoists for rotating the` furnace after the same has been rocked on the trunnions, the

said mechanism supporting said valve, andadapted to automatically close the valve whenever the operator is inattentive.'

3.` In combination, a ,rotatable furnace `mounted on trunnions, a pair of fluid pressure actuated hoists for supporting and rota-ting said furnace, a valve fori controlling said hoists, ymeans for operating said valve for effecting the hoisting of said furnace, and means actuated by said hoistsfor automatically closing said valve.

4j. In combination, aiy furnace mounted on trunnions and `having a pouring spout, means for tilting said furnace for'bringing the pouring spoutinto pouring pos1tion, locking means for holding' said furnace in yposition for pouring the metal -at a fixed point, and adjustable means for effecting the pouring of the metal `from different points.

5. yIn combinat1on,a furnace mounted on trunnions and provided with a pouring spout, a pair of power hoists for supporting and operating' said furnace, a valve for controlling said hoists, a mechanism for tilting said furnace around an axis passingtransversely through the point o the pouring spout, and: means for adjusting said furnace for depositing the melted metal at different points. 1

6. In combination, a furnace mounted on ,trunnions .and provided witha pouring spout and an' adjustable `pouring centen-pins carried by the furnace in line vertically with the trunnions, levers journaled "to the'trunnfionshaving slottedv arms to receive said pins, and `means for rocking the furnace on the trunnions to move pinsalong' said slots, for adjusting the pouring yspout'for pouring rmetal from different levels yfor feedin fthe molds. i n

7, A urnace structure comprising a fur.-

,nace body mounted on trunnions, said 'furnacey body lprovided with a pouringspout, and with pmsjin line parallel ywith atl-ansverse axisv passin through the oint of `the` evers yjourna edy to said` pouring s out, v trunnions aving slots 1n wh[1ch said pins are adapted to reciprocate when the furnace body isi` rocked on` said trunnions, a

hand-wheel #for locking the furnace body in a number of positions for pouring thefmetal i feeding the "molds praxis, and a.mechan1sm actuated "hoists: adapted for normally holding, the

` move upwardly away from the mold, for

pouring the metal from a copstantl chan ing level during the feeding of t e mol 9. In combination, a furnace body mounted on trunnions, said furnace body having a pouring spout, and having pins in line vertically with said trunnions, said furnace i body capable of being rocked on the trunnions' for bringing the pouring spout over a mold, levers journaled to said trunni )ns having arms provided `with slots` `for eng ag f ing said pins, a hand-wheel`carried by one of said pins for locking thefurnaoe body in different positions `when rocked, and a pair of fluid pressure actuatedhoists journaled on said trunnons adapted foi-tilting the furnace body upon said pms.

10.. In combination, a furnace mounted on trunnions` and rovlded with a pouring spout, pins carried by the furnace', levers journaled to the trunnions having slotted arms to receive said pins, means for` rock ing the furnace on the trunnionsf to move said ins along the slots of saidlevers for adjusting the pouring s out for pourl the metal from ldifferent .evels for fee irg.

the molds, anda pairof iuid pressure at tuy v ated` hoists journaled to sald trunnions,

adapted to elevate and rotate said furnace i on said pins.`

11'.: In combination, a furnace mounted on ,trunnions having a pouring spout` and a pour' j axis'on aline passing transverselyy throng the point of the pouring spout-,clef

vatinlg* means 'for tilting the said furnace i around thepouring ,axis,'and ymeans for 1d-v justing and` setting the curing spout for pouring the metal from different levels for 12. In combinat1on,a c ed ontrunnions having a pouring spout andy a pouring `airis on a line passmg'transvers ely miV furnace body mountl:

through the pouring spout,elevating me ans 120 comprising a pair of fluid ressure ho ists journaled to saldtrlmnions a apted for tilt- V -urin y sal mg the furnace body around the pouring spout `on the pouring axis.V

13..In combination,a furnace body mou nted on trunnionslhaving a pom-ing:Spqut.` und.j c l 4 a .pouring axis' a line pass'mg transinversely through they point' of thepourlng 130 spout, elevating means` comprisin ampair of fluid pressure actuated hoists Journaled to said trunnions adapted for tilting the furnace body 'around ythe pouring axis, a

mechanism actuated by said hoists adaptedV Y eratin said furnace, means or braking and steadying said hoists and. said furnace for preventing intermittent movements of said parts, a mechanism connected with and actuated by said hoists, adapted toA coperatie with said hoists for elevating and rotating said furnace for pouringmetal directl into a mold, a valve carried by arts o said mechanism adapted to contro said hoists, and means for automaticall closing the said valve when theoperator or inattentive.

15. In combination, a furnace mounted on trunnions and .provided with a pouring spout, a liuid ypressure actuated -hoist journaled to each of said trunnions for supporting said furnace, a truck* frame `having wheels vfor rendering said furnace portable, a shaft carried by said frameffor lsupporting said hoists,- means for operating said hoists simultaneously forl elevating said furnace for ouring the metal directly into the mol s, vand means for adjustin the furnace for de siting the metal at di erent points.

16. n combination, afurnace body mounted on trunnions having'a pouring spout and a pouring axis on a line ,passing trans-y versely through the point of the pouring s out, elevating means comprising a pair of uid pressure hoists journaled to the trun-l nions adapted for tilting the furnace body around the pouring axis, a mechanism actuated lby said hoists adapted for normally holding the pouring snout on the pouring axis, and means vfor adjusting parts of sai mechanism for varying the pouring axis.

17. In combination, a furnace mounted on trunnions and provided with a pouring spout, a fluid pressure actuated hoist journaled to each of the trunnions and provided with' means for preventin intermittent movement thereof, pins carried bythe top of the furnace, levers journaled to the trunnions and provided with slotted arms adapted to receive said pins, means for tilting said furnace on the trunnions a distance equal to the travel of said pins in said slots for bringing the pouring spout over a mold, and means carried by one of said ins for locking the 'furnace m a number o positions intermediate the ends of said slots for e'ect` ing thevpoui'i `of the metal from diiferent mes careless 18. In combination, a self-contained fur.- nace, a pair of hoisting cylinders for supporting the furnace, a truck-frame for supporting said cylinders, trunnionscarried by the furnace for pivotally connectingthe fur thel furnace body for pouring metaldirectlyI into a mold, a mechanism actuated by and coperating with said cylinders for rotating the furnace around an axis passing transversely through the point o the pouring spout, and a series of links and levers capable of being adj usted for lsuccessively changing the axis around which .the furnace rotates.

20. Iny combination, altiltable orrotatable furnace body having a curing spout, a pair o'f hoists for supporting the weight of the furnace body and for rotating the furnace for pouring metal directly into a mold, a mechanism actuated by and coperating with said hoists for rotating the furnace around an axis passing transversely throufgh the vpointof the pouring spout, means or adjusting partsk of said mechanism for shifting the axis of the pouring spout for depositing the metal at di'erent points, -and means for -chan'gin the radifis of the pouring spout, for e ecting the pouring of the metal from di'erent points vertically.

21. In combination, a rotatable furnace mounted on trunnions and providedy with a youi-ing spout, a pair of fluid ressure hoists Journaled tothe trunnions a apted to su port the wei ht of the furnace and to tilt the furnace or pouring metal directly into molds, levers 'ournaled tothe ktrunnions and provided wit slotted arms, said levers adapted to control theV arc through which the uring spout rotates, pins carried by the rnace normally positioned in the slots of said levers adapted to support the top of the furnace durin the pouring o erations, and means fora Justing and oc ng said pins in different ositions in said slots for cha the ra 'us ofthe arc throu hr whic t e pouringtsout travels while t e I furnaceisbeing ti or elevated.

22. In combination, a furnace mounted on trunnions and (provided with a pouring justable pouring center, a

out and an ya n uid yactuated hoist journaled on each of said trunnions, pins by the top ofthe furnace, levers 'j'urnaled to the mechanism a hoists for rotating the furnace on the' trimtrunnions and provided with slots adaptedr to receive said pins, means for tilting the furnace on the trunnions a distance to thetravel of the pins in the j slots for bringing the tpouring spout over a mold, a

apted to coperate" with said nions and also on said pins, said mechanism arranged to normally hold'the pouring spout at a fixed oint horizontally, and means conn nected wit said mechanism for shifting and holding the pouring spout at different points horizontally. i f I 23. In combination, a furnace mounted on .trunnions and having a pouring spout, a

pair of fluid pressure actuatedhoists journaled to the trunnions for supporting the weight of the furnace and for tilting the mechanism connecting with the said holsts and also with said levers, the said@ mechanism actuated by said hoists, andy adapted to fix and control theaxis `around n which the furnace is tilted, and meansriorr adjusting parts of said mechanism for elevatlng the pouring spout during the pouri rig operations. In testimon whereof I aix p in presence o two witnesses.

Witnesses:

P. Non'mN, Crus. A. DUNHAM.

MERRILL DAVIS.

my signatt re

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