US1025515A - Portable furnace. - Google Patents

Description

' M. DAVIS.Y

PORTABLE FURNAGE.

APPLICATION FILED JULY 1s, 1911'. l

1 Patented May 7, 1912.

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' MERK/a DAV/s ATTORNEY.

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PORTABLE FURNAGE.

APPLICATION FILED JULY 13, 1911.

Patented May f7, 1912.

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M. DAVIS.

PORTABLE PURNACE. APPLICATION FILED JULY 1 3, 1911.

Patented May 7, 1912.

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M. DAVIS.

PORTABLE FURNAGE.

APPLICATION FILED JUL 1,025,515. m 19u Patented May '7, 1912.

4 SHEETS-SHEET 4.

ATTORNEY.

Y vUNITED STATES PATENT OFFICE.

MERRILL DAVIS, 0F WATERTOWN, NEW YORK, ASSIG-NOR TO JAMES B. WISE, OF WATERTOWN, NEW YORK.

To all whom it may concern:

Be it known that I, MuRmLL Davis, citizen of the United States, residing at lVatertown, in the county of Jefferson andl 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 or crucibles, designed for use in melting various kinds of metals, and the invention relates particularly to a tiltable and rotatable furnace adapted for pouring the molten metal directly into the molds.

The object of the invention is to provide a novel, simple and convenient furnace of the class, which is capable of being fired by gas, oil, coke or other suitable fuel, and the ring controlled by either'natural or mechanical draft.

A further object is to provide a self-firing furnace having a pouring spout for discharging the metal directly into the molds or chills, wit-hout the use of ladles or dips.

A further object is to provide a furnace adapted to stand erect for charging the same, and in means for supporting and locking the furnace in said position.

A further object is to provide a furnace which may be tilted into an inclining position for skimming the metal preparatory to pouring the same, and in means for supporting and locking the furnace in the said position.

A further object is to provide a furnace which is capable of being elevated from the inclining or skimming position, and then rotated for pouring the metal directly into the molds, and in means comprising a series of movable parts coperating with the elevating and rotating mechanism, for effecting the pouring ofthe metal from` a center in line with the tip of the pouring spout.

A further object is to provide a frame for supporting the furnace and its operating parts, which is mounted upon a truck equipped with wheels or rollers adapted for traveling on a track, for transporting the furnace from one mold to another.

A further object is to provide a counterweight for balancing the weight of the furnace. And a particular object iS to provide Specification of Letters Patent.

Application filed July 13, 1911.

PORTABLE FURNACE.

Patented May 7 1912.

serial No. 638,296.

adjustable means for varying the center at which the pouring spout may be held for pouring the metal into the molds.

The various features and parts of the invention will be understood from the detailed description which follows, and by reference to the accompanying drawings, which form a part of this specification, and in which-- Figure 1 is a front elevation of the complete device; showing the furnace in. erect position ready for charging and tiring. Fig. 2 is a right side elevation of the same. Fig. 3 is a top plan view of the furnace in the charging posit-ion. Fig. 4 is a right side elevation; showing the furnace tilted forward for skimming the metal; also showing the first step in the pouring operation. Eig. 5 is a similar elevation; showing the furnace elevated for pouring its contents'into the mo-ld. F ig. 6 is an enlarged detail view; showing the construction and operation of the locking parts which hold the furnace in the several working positions. Y

In the drawings, 2 represents a furnac for melting metals of various kinds, consisting of a cylindrical outer body or jacket 3, which may be made of any suitable materia-l, and may be lined in any suitable manner for withstanding a high degree of heat, and a Crucible or melting-pot 5, having a pouring spout 6, arranged at one side of the mouth of the jacket 3. The Crucible may Vbe positioned and held in any suitable manner, but it is preferably arranged concentrically in the body 3, so as to provide a combustion chamber 7, which surrounds the crucible. Any suitable fuel, as gas, coke or oil may be employed for heating the furnace, and the firing may be effected by natural draft applied in the usual manner, or by mechanical draft applied by means of a pipe 9, and a suitable blower (not shown). The pipe 9 is preferably detachably connected to the jacket' 3 bymeans of a thimble or sleeve 10. When coke or other solid fuel is employed for heating the furnace, it is placed in the chamber 7, and burned there under forced draft, as explained.

The self-contained furnace 2 is pivotally mounted between vertically arranged frame sections 11 and 12, and is rendered tiltable and rotatable when supported by the frame, in the usual manner, by means of oppositely 'parts of the device.

erating parts is borne by the frame sections 11 and 12, and at this time the t-runnions 13 and 14 rest in shallow recesses or bearings 15, which are'formed in the sloping upper edges of the said sections. While the furnace is in the upright position as shown in Figs. 1, 2 and 3, and supported by the frame sections 11 and 12, it may be tilted or rocked forward or backward to and from the posit-ions shown in Figs. 3 and 4, by hand, without disturbing any of the other operating The frame sections 11 and 12 are mounted upon atruck bed, which comprises side rails 16 and 17, which are provided with perforated lugs 18, to receive the axles 19, upon which are journaled wheels or rollers 20, the axles preferably being rigidly held in the boxes 18, and the wheels turning on the axles. The complete machine when mounted upon the truck, is portable or movable from one vplace to another by means of a pair of track-rails 21.

22 represents a vertically movable pan like bottom, which is supported concentri* cally beneath the furnace, and above the truck frame, by a pair of levers 23, the upper ends of which pivotally engage trunnions 24 which are carried by, and project from, the opposite sides of the pan 22. The ends of the trunnions 24 play in, and are guided by, vert-ical slots 25, which are formed in the frame sections 11 and12, di* rectly below the bearings 15. The lower Aends of the levers 23 are pivoted to crankarms 26 carried by a rocking shaft 27, which may be j ournaled in a suitable manner to the frame sections 11 and 12, and to one end of which is attached a hand-crank 28, by means of which the pan 22 is raised and lowered (see Figs. 2, 3 and 4). The pan 22 is employed for closing the usual draft openings in the bottom of the furnace 2, during the charging and firing intervals, and also aids in holding the furnace rigidly in upright position. Before tilting the furnace on the trunnions 13 and '14, the bottom 22 must be dropped to its lowest position, so as to permit the lower end of the furnace to swing freely in the frame.

I am aware that tiltable and rotatable melting furnaces have long been in use, and in a former application filed March 30, 1911 Serial No. 617,874, I described and showed a tilting and rotating 'furnace adapted for pouring the molten metal directly from the crucible into the molds, the device of said former application being equipped with mechanisms whereby the furnace is elevated and rotated around a center or axis passing transversely through the pointof the pouring spout of the furnace, thereby providing la constant fixed center from which the entire contents of the furnace may be poured directly into the molds from an unvarying point. In order to provide the said fixed pouringce'te'r, the device of said former application is equipped with concentric journals mounted rigidly upon the top of t-he furnace, in line with the pouring spout, and a pair of journal bearings arranged in forwardly projecting portions of the frame sections, which were adapted to receive the said journals when the furnace was tilted forwardly into the initial pouring position. Under this former arrangement, the said pouring center was absolutely fixed and constant and could not be varied. Since devising said former furnace, I have found that the forwardly projecting parts of the frame interfere with or. strike the molds adjacent to the one into which the metal is being poured, also that the provision of the fixed and unvarying pouring center tends to limit the machines to but one line of casting, and in order to render furnaces of the class more universal and practical for general casting work, it is desirable and necessary to provide means for adjusting and varying the pouring center, so as to adapt the furnaces for pouring molten metal into a mold, or into a group or gang of molds, wherein the receiving vents cannot always be located at a common distance from the furnace, or at the same relative distance from the pouring center fixed by the aforesaid journals.

To that end, the primary object of the present invention is to dispense with the journals and the journal bearings of the former device, thereby eliminating from the present structure the feature of the fixed or constant pouring center, and to substitute therefor a variable axis about which the furnace may be rotated, together with a series of novel operating parts, which are contrclled by simple adjusting means, whereby the tip of the pouring spout may be readily and quickly brought int-o, and temporarily held at, any desired center or point, and the furnace thereafter rotated around the said axis while discharging the contents of the crucible into the molds. The details of construction and operation of the elevating, rotating and adjusting parts will now be described. J

The furnace 2, as explained, is normally supported in its upright position, by the trunnions 13 `and 14, when the latter are seated in the bearings 15 yof the frame sections, and while in the latter position, the furnace may be tilted, by hand, either forward or backward, for the purpose of charging, ring, skimming, or cleaning the crucible, as well as for pouring the molten metal into ladies or likek receptacles. After the furnace has been charged and fired suf-- fciently to melt the metal, it may be trundled along on the tracks 21 until it comes opposite a mold, as 29. As soon as the furnace is brought opposite a mold, and before t-he metal is poured, it is usual to skim the metal in the crucible. To do this properly, the furnace is tilted forwardly on the trunnions 13 and 14, from the position shown in Figs. 1, 2 and 3, to that shown in Fig. 4. This is also the rst step in the pouring operation. The furnace will then be held in the inclined position, principally by gravity, but also partly by a pair of catches which will later be described.

The elevating mechanism consists of the following parts: 32 represents a rocking shaft which is journaled in bearings 33 formed in the rear-end po-rt-ions of the frame sections 11 and 12, the said shaft projecting beyond the said sections at each end to receive elevating levers 34 and 35, which are rigidly connected to said shaft by keys 36. The levers 34 and 35 are substantially bellcranks, and their forward ends or arms pivotally connected with like links or rods 37,

rby pins 38. The upper ends ofthe links 37 are pivotally connected to the outer ends of the trunnions 13 and 14 of the furnace. The lever 34 is provided with a relatively long rearwardly projecting arm or extension 39, upon which is adjustablyA mounted counterweights 40, which are pivoted by a pin 41, to a guide 42, which is reciprocable on the said arm, by means of a screw 43, which is journaled in a lug 44l carried by the end of the arm 39, and a hand-wheel 44. The screw 43 connects in the usual manner to a threaded portion of the guide 42 for operating the same. The counterweights 40 are provided for balancing the weight of the furnace, for lightening the work and strain of elevating and lowering the furnace.

The elevating of the furnace during the pouring intervals, is accomplished by handpower, by means of a hand-wheel 45, which is fixed rigidly on one end of a screw 46. The rod or screw 46 is journaled to a projection 30 of the frame section 11, by a sleeve or part 47, which holds the screw from longitudinal movement, while the threaded free end of the screw 46 pierces a swivel-nut 48 which is pivoted by a pin 49 to a depending lug or arm 50 of the lever 34. The turning of the hand-wheel 45 in the right direction, swings the end 34 of lever 34 upwardly, thereby rocking shaft 32 and the lever 35 in the direction for raising the links 37, for breaking the connection between the trunnions 13 and 14 and the frame, and elevating the furnace for pouring the metal into the molds. By the use of the screw 46, the elevating of the furnace may be effected in a steady, gradual and easy manner, and likewise with safety and positiveness.

To properly support and control the furnace during the elevating and pouring operations, I provide the following coacting parts: 51-51 represent like levers, each having three arms, as 52, 53 and 54, the arms 52 being bored out for affording bearings to receive the t-runnions 13 and 14 of the furnace, and these levers are positioned between the furnace and the links 37, as best seen in Fig. 1. The arms 53 of levers 51 eX- tend upwardly and rearwardly and are fitted at their free ends with inwardly projecting pins or studs 55, which are adapted to be engaged by hooks 56 of a pair of like catches 57, for locking and holding the furnace in the upright position shown in Figs. 1, 2 and 3. The anchor-shaped catches 57 are pivoted to the opposite top sides of the furnace by means of pins 58. When the furnace is tilted forwardly for skimming, and for placing the furnace in the first pouring position, the opposite hooks 59 of the catches 57 may be thrown into engagement with pivot-pins 60 carried by arms 54 oflevers 51, for locking and holding the furnace in the inclined position shown in Fig. 4. In the present device, there are no other supports provided for the top of the furnace, while the latter is in the inclined or elevated and pouring positions, than the catches 57, and the pins 60 carried by t-he levers 51. The arms 54 of the levers 51 are pivotally connected to corresponding vertically disposed double-levers or walkingbeams 61, by pins 62. The beams 61 are pivoted between their ends by pins 63, to arms 64 of like guide-blocks 65, each of which are held in place by, and are movable vertically upon, a pair of studs or guide-rods 66, which are rigidly set in overhanging portions 67 of the frame sections 11 and 12. 69 represents like bell-crank levers, which are pivoted to the overhanging portions 67 of the frame by pins 70, the short arms of said levers being pivoted to the lower ends of the levers or beams 61 by pins 71; while the upper ends of the longer arms of the levers 69, are pivoted by pins 72, to like links or bars 73, which extend rearwardly and downwardly on the opposite sides of the furnace, and. their rear ends connect in a pivotal manner to the levers 34 and 35, by pins 74.

Assuming that the furnace is in the tilted position, ready for skimming, and elevating for pouring the metal into the molds, and also that the screw 46 is'provided with righthand threads, to elevate the furnace from the position shown in Fig. 4 to that shown in Fig. 5, the operator should rot-ate thel handwheel 45 to the right. This will gradually effect the raising of the forward ends of the levers 34 and 35, and also the links 37, which will lift the furnace clear of the frame sections at 15. As the elevating operation continues, the weight of the top or forward end of the furnace is supported by the catches 57 and the pins 60 of the levers 51, while the bottom or rear endof the furnace is supported by trunnions 13 and 14. The trunnions 13 and 14 being positioned a considerable distance rearwardly of a transverse line drawn through the tip of the pouring spout, the natural tendency is to turn the pouring spout in an arc corresponding to the swing of the furnace on the said trunnions, thereby producing a constantly changing center which would effect the depositing of the metal at different points, instead of at the' same point, as desired. In the present device I avoid this, and effect the pouring of the metal at the same point throughout an entire pouring operation, although 'no fixed mechanicalv aXis is provided in line with the pouring spout. The following will serve to explain the working of the parts: At the start of the elevating operation, as soon as the trunnions 13 and 14 become free from the bearings 15 of t-he frame, the upward movement of the forward arms of the bell-crank levers 34 and 35, and the links,37, forces the furnace upwardly, and

at the same time, the short arms of the leversv 34 and 35 pull backwardly on the links 73, which connect with the long arms of the bell-cranks 69, tilting said arms rearwardly, and lifting the short arms of the cranks 69, which elevate the walking-beams The upward movement of thebeams 61 carries with them the guide-blocks 65, which are slidable on the studs 66, which are fixed upon the overhanging portions 67 of the frame. The levers 51 having their forward arms 54 connected to the upper-ends of the beams 61 also move upwardly to the same extent as the guide-blocks and beams, and the top or forward end of the furnace, being supported entirely by engagement of the catches 57 with the pins 60 carried by the levers 51, also moves upwardly. The upward movement of the ends 34 of levers 34 and 35, causes a rearward movement of their vertically disposed arms which carry the rearward ends of levers or bars 73 by means of pins 74. The forward ends of bars 73 being connected by the pins 72 to the vertically disposed arms of the bell-cranks 69. will cause said arms to move in a rearward direction, corresponding to the movement of the levers 34 and 35. The bell-cranks 69 being pivotally mounted on the studs 70, their shortl arms which carry the lower ends of beams 61, by means of pins 71 will describe concentric upwardly and forwardly extend-` levers 51 to describe upwardly and rear-` wardly extending arcs, the radius and path of which is governed by the disposition of' the points or centers 62-76-71 of the beams 61. The point from which the metal is to be poured, having been decided upon, the centers 62-76-71 of beams 61 are so disposed as to cause the upper ends of said beams to describe rearwardly and vertically extending arcs, the centers of which are located on a line passing transversely through the po-int of the spout 6, when the` furnace is tilted forwardly, as shown in Fig. 4,-and the tip of the pouring spout will then be held at the point or center from which the metal is to be poured. The forward ends 54 of levers 51, thus are made to travel in arcs around the pouring point 6 (Figs. 3 and 4), the supporting points of the furnace, during the pouring operation, comprising the trunnicns 13 and 14 and the pins 60, all of which are carried by and are movable wit-h the levers 51, must travel in relatively large arcs aroundl the same center 6. The furnace during the pouring operations is supported at four pcints,`namely, by the trunnions 13 and 14 and by the pins 60, all of which supports are disposed eccentric to the transverse axis or center upon which the pouring spout revolves.

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

1. In combination, a furnace body journaled upon trunnions, means for rocking the furnace body backward and forward on said trunnions, said furnace having' a pouring spout and pivotal catches in line with the trunnions and rearwardly of the pouring spout, levers journaled on the trunnions having pivot pins adapted to be engaged by said catches during the forward swinging of .the furnace, and means adapted to lift the furnace body upon said levers after said catches have been brought into engagement with said pivot pins.

2. In combination, a furnace mounted upon trunnions and provided with a pouring spout, levers journaled on the trunnions and having concentric pins in line parallel to the transverse aXis of the pouring spout, catches carried by the furnace adapted to engage the said pins, means for rocking the furnace upon the trunnions to bring the catches into engagement with the pins aforesaid, and means for lifting the furnace upon said pins and levers as a center and support.

3. In combination, a furnace mounted upon trunnions and provided with a pouring spout, catches pivoted to the furnace in line vertically with the trunnions, levers pivoted to the trunnions having pivot studs in the path of the catches, means for rocking the furnace upon the trunnions to bring the catches and pivot studs into engagement, and means for tilting the furnace upon the pivot studs and levers as a suport.

p L In combination, a furnace body mounted upon trunnions, said furnace body being provided With a pouring` spout and With rocking catches disposed above the trun nions, levers journaled to said trunnions having pivot-pins in the path of said catches, means for rocking the furnace body upon the trunnions, independent means for tilting the furnace body upon the pins aforesaid comprising an elevating device and links carried thereby engaging the trunnions of the furnace body.

5. In a device of the classdescribed, a furnace body mounted upon trunnions, means for rocking the furnace body upon said trunnions, catches carried by the furnace body, levers carried by the trunnions, pivot pins carried by said levers adapted to be engaged by said catches When the furnace body is rocked forwardly on the trunnions, and means for tilting the furnace body around said pivot pins as a center.

6. In combination, a furnace body mounted upon trunnions and provided with a pouring spout, and having concentric catches in line with the transverse diameter of the furnace body, levers journaled to said trunnions having fixed pins normally positioned between said catches and the pouring spout, means for rocking the furnace body to bring the catches-into engagement with said pins, and means for raising the furnace body on said pins Vas a support.

7. A furnace structure comprising a furnace body mounted upon trunnions, said furnace body provided With a pouring spout and With pivoted catches in line vertically with said trunnions, pins carried by levers journaled to said trunnions, means for tilting the furnace body for bringing the catches into engagement With said pins, elevating means engaging the trunnions to lift the furnace body upon said pins as a center, and means for holding the pouring spout on an independent center during the elevating operation.

8. In combination, a-furnace body journaled on trunnions and having a pouring spout, and a pouring axis concentric to the point of the pouring spout, elevating means for tilting the furnace body around the pouring axis, and Walking-beams carried by guide-blocks actuated by said elevating means adapted for holding the pouring spout on a constant fixed center.

9. In a device of the character described, a body mounted upon trunnions and provided With a pouring spout, levers carried by said trunnions having pins facing the body, catches mounted on top of the body in the path of said pins, means for tilting the body for bringing said catches into engagement with said pins, elevating means engaging said trunnions to lift the body upon said pins as a support, and independent elevating means for maintaining a fixed pouring center in line with the point of the pouring spout.

l0. A furnace structure comprising a furnace body mounted upon trunnions, said furnace being provided with a pouring spout and with catches in line parallel With said trunnions, levers journaled to said trunnions having pins projecting into the path of said catches, means for manually tilting the furnace body for bringing said catches into engagement With said pins, and means for elevating and rotating the furnace body around said pins for maintaining an axis concentric to the point of the pouring spout. y l1. A furnace structure comprising a furnace body mounted upon trunnions, said furnace body provided With a pouring spout, and With catches in line parallel With a transverse axis passing through the point of said pouring spout, levers journaled to said trunnions having pins projecting in the path of said catches, means for manually tilting the furnace body for engaging said catches With said pins, means cooperating Wit-h said pins for elevating and rotating the furnace body, and means for controlling .said pouring spout for effecting the pouring of the metal from a substantially fixed center.

1Q. A furnace structure comprising a body mounted upon trunnions, said furnace being provided With a pouring spout and With pivoted hooks disposed rearwardly of the pouring spout, supporting-pins carried by parts connected to the trunnions, means for rocking the body for bringing said hooks into engagement with said pins, means for elevating and rotating the body on said pins as a support, and elevating means for independently fixing a center around Which the pouring spout revolves.

18. The combination With a self-contained furnace mounted upon a portable carriage, said furnace having a pouring spout, and a pair of trunnions for pivotally connecting the furnace to the carriage, of a pair of levers j ou rnaled to said trunnions and having studs or pins projecting toward the furnace, a pair of catches carried by t-he furnace adapted to engage said studs or pins When the furnace is tilted forwardly, and means for tilting the furnace on said pins or studs for holding the tip of the pouring spout on a fixed axis.

lll. The combination with a self-iring furnace, and a carriage for supporting the furnace, the said furnace having a pouring spout, and having trunnions for rendering the furnace tiltable on the carriage, of a pair of levers journaled to the t-runnions having pivot-pins facing the furnace, hooks carried by the furnace adapted when the furnace is tilted forwardly to engage said pivot-pins, means for elevating and rotating the furnace on said pivot-pins as a support, guides carried by the carriage and walking-beams pivoted to a sliding block mounted on said guides, the said walking-beams connected to said levers, and also to parts of said elevating means, adapted for raising and tilting the furnace body for eecting the pouring of the contents of the furnace from a fixed point.

15. In combinat-ion, a self-contained furnace and a frame for supporting the furnace, the furnace having a pouring spout, and havingV trunnions for rendering the furnace tiltable, a pair of levers journaled to said trunnions having pins facing the furnace, hooks pivoted to the furnace in the path of said pins, means for elevating and tilting the furnace upon said pins, and means carried by the frame and actuated by said elevating means adapted for holding the point of the pouring spout at a fixed center during the tilt-ing of the furnace.

k16. In combination, afurnace mounted on trunnions and providedwith a pouring spout, a frame for supporting the furnace, guides mounted on the frame, walkingbeams controlled by said guides, levers pivoted to said trunnions and also to said walk-- ing-beams, said levers being provided with pins, catches pivoted to the furnace, means for manually tilting the furnace to bring the catches into engagement with the pins, means for elevating and tilting the furnace on the pins as a support, and means for actuating said walking-beams for effecting the rotation of the furnace on a center independent of said pins and said trunnions.

17. In combination, a furnace mounted on trunnions, the said furnace provided with a pouring spout and a pair of pivoted catches, a frame mounted on a truck for supporting the furnace, guide-pins mounted on the frame, walking-beams pivoted to parts sliding on said guides, levers pivoted to the trunnions and also to said walking-beams,

' said levers being provided with concentric pins in the path of said catches, means for rocking the furnace for bringing the catches into engagement with the pins, means for rotating the furnace upon said pins, as a support, adjustable means for varying and temporarily fixing the center of rotation of the furnace, and means for actuating said Walking-beams for holding the pouring spout on a fixed pouring center.

18. In combination, a furnace mounted on trunnions and provided with a pouring spout and a pair of tiltable catches, a frame for supporting said furnace, an elevating mechanism comprising a rocking shaft journaled in the frame, and a series of bellcrank levers and links for connecting said shaft to said trunnions, levers pivoted to said trunnions and also to walking-beams carried by the frame, pins carried by said levers adapted to be engaged by said catches for locking and holding the furnace in upright position, studs carried by said levers adapted to be engaged by said catches when the furnace is rocked forward, and a screw supported by the frame and connected with one of said bell-crank levers adapted for lifting or rotating the furnace on said studs during the pouring operations.

19. In combination, a self-firing furnace, and a carriage for supporting thefurnace, the furnace mounted on trunnions and having a pouring spout, a. pair of levers pivoted at one end to the trunnions, the other ends pivoted to walking-beams supported by the carriage, pins carried by said lever and catches carried by the furnace for supporting the top of the furnace when rocked into pouring position, elevating means for tilting the furnace upon said pins as a support,

and means connecting with the elevating i means and also with the walking-beams for elevating and swinging the furnace around an axis passing transversely through the tip of the pouring spout during the pouring operations.

20. In combination, a. self-firing furnace, and a carriage for supporting the furnace, the furnace mounted on trunnions and having a pouring spout, a pair of levers pivoted at one end to the trunnions, the other ends pivoted to walking-beams supported by the carriage, pivots carried by said levers and catches carried by the furnace for supporting the top of the furnace when rocked into pouring position, elevating means for tilting the furnace upon said pivots, means for elevating the walking-beams for holding the point of the pouring spout on a fixed center, and means for adjusting the walkingbeams for varying the center upon which the point of the spout revolves.

21. In combination, a furnace body mounted upon trunnions, a frame for supporting 'the furnace body, a rocking shaft journaled in the frame, a pair of elevating vlevers carried by said shaft, a pair of links connecting said levers to the trunnions, a pair of levers pivoted to the trunnions, said levers having pins facing the furnace body, tiltable catches carried by the furnace body, means for tilting the furnace body for bringing said catches into engagement with said pins, and a screw connected to one of said elevating levers adapted to rock said shaft for elevating and rotating the furnace body radially around the point of the pouring spout as a center. y

22. In combination, a furnace body mounted upon trunnions and having a pouring spout, a frame for supporting the fur.- nace body, a rocking shaft journaled in the frame, a pair of elevating-levers carried by said shaft, a pair of links connecting said levers to the ytrunnions, a pair of levers pivoted to the trunnions, said levers having pins facing the furnace body, tiltable catches carried by the furnace body, means for tilting the furnace body for bringing said catches into engagement with said pins, a screw connected to one of said elevatinglevers adapted to rock said shaft for elevating and rotating thel furnace body around the point of the pouring` spout as a center, a pair of guides mounted on the frame, a Walking-beam pivoted -to a sliding block mounted on each pair of guides, the upper ends of the Walking-beams connected to the levers carrying said pins, bell-cranks pivoted to the frame and connecting to the lower ends of the Walking-beams, and bars connecting said bell-cranks to the elevating-levers adapted for raising and lowering the walking-beams, whereby the point of the pouring spout may be held on a fixed pouring center eccentric to said pins.

23. In combination, a furnace body mounted on trunnions and having a pouring spout, levers journaled to the trunnions having oppositely facing pins, swinging catches mounted on the furnace body adapted to engage said pins for definitely fixing thel point of the pouring spout, a frame for supporting the furnace and operating parts, adjustable Walking-beams carried by the frame and connecting With said levers, a rocking shaft journaled in the frame, an adjustable Weight adapted to exert a rotary movement to said shaft, a pair of elevating levers fixed on said shaft, a threaded shaft journaled to the frame and operatively connected to one of said elevating levers having a hand-Wheel for manually rocking said shaft, a pair of links connecting the elevating-levers to said trunnions, a pair of bellcranks carried by the frame and connecting with said Walking-beams, a second pair of links connecting the elevating levers to said bell-cranks adapted for operating said Walking-beams, guides mounted on the frame, blocks slidable on said guides and pivoted to said Walking-beams, the whole when actuated by the aforesaid threadedshaft and Weight adapted to effect the movement of the furnace body in a vertically disposed arc having for its center a transverse axis passing through the point of the pouring spout..

In testimony whereof I affix my signature in presence of two Witnesses.

MERRILL DAVIS. itnesses P. NORTON, CHAs. A. DUNI-IAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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