US700135A

US700135A - Apparatus for roasting and cooling ores.

Info

Publication number: US700135A
Application number: US8869102A
Authority: US
Inventors: William C Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-01-06
Filing date: 1902-01-06
Publication date: 1902-05-13
Anticipated expiration: 1919-05-13

Description

No. 700,135. Paton ted May l3, I902.

v w. c. DAVIS.

APPARATUS FOR ROASTING AND COOLING-BEES.

(Application filed Jan. 6, 190B.) (No Model.) l0 Sheets-Sheet 2.

W] T NESSES In [N VEN T OR.

AIZTORNEY.

THE miams pzrzRs coy, PHOTO-UTHO" wunmu'rdu. u. c.

No. 700,!35. I Patented May l3, I902.

W. 6. DAVIS.

APPARATUS FOR ROASTING AND COOLING DBES. I

(Applichtion filed Jan. 6, 1902.) (No Ilodal.) I0 Sheets$haet 3.

WITNESSES: INVENTOR.

g, zhj/A 4727M;

L By I ATTORNEY.

- Patented May l3, I902.

A w c. DAVIS. APPARATUS FOR RUASTING AND COOLING OBES.

(Application filed Jan. 6, 1902.)

lo Sheets$haet 4.

(N0 ModeL;

llllll ljilllllh WITNESSES 22 6. 9

I INVENTOR. Zfi /AQ/y 407M 8) 1 I ATTORNEY.

m: uunms PETERS co.. PnoTouTHu WASHINGYON u c IUShaets Sheet 5.

(Ito Model.)

11V VENT OR. 4% l/w y 6 WITNESSES ATTORNEY.

No. 7o0,|35. I Patented May-l3, I902;

' w. c. DAVIS.

APPARATUS FUR RUASTING AND COOLING ORES.

N o. 700,|35. .Patented May I3, [902.

w. c. DAVIS. APPARATUS FOR ROAST'ING AND COOLING (IRES.

(Application filed Jan; 6, 1902) (No Model.) 10 Sheets-Sheet 7.

WITNESSES: INVENTOR.

ATTORNEY.

TH: Noams PETERS co PNOTO-LITHCL. WASHINGTON. a c.

N0. 700,!35. Pafented May I3, 1902. w. c. DAVIS. APPARATUS r00 ROASTING AND couuus ones.

(Application filed 3m. 6, 1902.) (No Model.) In $heets8heet a'.

IV I'LVESSES: 1N VENT 0R.

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ATTORNEY.

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No. 7oo',|'3 5.' Patented May 13, I902.

- y w. c. DAVIS.-

APPABATUS FOR ROASTING AND COOLING OBES.

(Application filed Jan. 6, 1902.)

(No Model.)

H] Sheets-8heet 9.

I JNVENTIOR. J/I /A 27m; B2

ATTORNEY.

No. 700,|35. Patented May I3, 1902. w. c. DAVIS.

APPARATUS FOR RDASTI NG AND COOLING ORES.

(Application filed Jan. 6, 1902.)

lo Shets-Shaet in.

(No Model.)

WITNESSES: I JNVENTOR:

UNITED STATES P TENT. OFFICE.

YVILLIAM C. DAVIS, OF DENVER, COLORADO.

APPARATUS FOR ROASTING AND COOLING ORES.

SPECIFICATION forming part of LettersfIEaten't No. 700,135, dated May 13, 1902.

. Application filed January 1602. serial No. 83,691 (No model.)

To all whognitntay conccrm' Be it known that-I, WILLIAM C. DAVIS, a

' citizen of the U nited States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Apparatus for Roasting and Cooling Ores; and'I do declare I the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art 'to which it appertains to make and-use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in apparatus for roasting and cooling ores preparatory to treatment for the purpose of saving their metallic values. As is well known to those skilled inthe art, theroasting operation is for the purpose of removing certain elements, as sulfur, arsenic, &c., which render the ores in their natural state refractory,

whereby it becomes impracticable to separate the values from the gangue. After the roasting operation is complete the ore, which is in a highly heated condition, must be cooled before it can be treated. My present object is to provide a thoroughly practical apparatus for successively performing the ore roasting andcooling functions.

In order that the invention may be perfectly understood, I will first point out in a very general way some of the main features of the invention preparatory to the detailed description, which will be followed by the claims.

The apparatus comprises an inclosed roasting-hearth and an exposed cooling-hearth located above the roasting-chamber. Within the roasting-chamber, which is in communication with the necessary source of heat, is a rabble-carriage propelled by wheels located in pockets formed adjacent and along the outer edges of the roasting-hearth, said wheels being operated by suitable shafts and gears located outside of the roasting chamber. The rabble carriage consists of hollow side bars having cogged racks on their lower edges arranged to mesh with the cogs of the propelling-wheels. These side bars of the carriage comprise water-receptacles and are connected by hollow transverse bars, through which the water circulates to prevent injury to the apparatus from the high degree of heat maintained in the roasting-chamber. On one of the hollow transverse bars is loosely 1nount ed a sleeve, to which are secured the rabble blades or plows. Provision is made for antomatically reversing the rabble-carriage-opcrating mechanism when the carriage has reached either end of the roasting-chamber, whereby the carriage begins its reverse movement. Provision is also made for automatically replenishing the carriage water-supply when the carriage has reached its limit of movement in one direction; Means are further provided for giving the rabble-sleeve a quarter-turn at each extremity of the roasting-chamber, whereby the rabble-blades are held in an inoperative position during the return or forward movement and in an operative position during the rearward movement, and finally means are provided for receiving the roasted ore as it is dischaged at the rear extremity of the roasting-chamber and carrying it automatically to the cooling-hearth above, Where it is acted on by a. rabble construction similar to that in the roasting-cham ber, except that the water-cooling feature is absent, for the reason that it is not needed, the cooling-hearth being located in the open air. The invention will now be described in detail, reference being made to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a side elevation of the forward portion of my roasting and cooling apparatus, the smoke-flue leading from the roasting-chamber to the stack being shown in section. Fig. 2 is a view of the central portion of the apparatus, showing a fire-box in section. Fig. 3 is a similar view of the rear portion of the apparatus, the flue through which the chute for the discharge of the roasted ore passes being shown in section. Fig. 4 is a fragmentary horizontal section taken through the roasting-chamber above the hearth, which is shown in plan. In this view the parts are shown on a larger scale than in Figs. '1, 2, and 3. Fig. 5 is a section taken through the roasting-chamber, cutting one of the fire-boxes. Fig. 6 is a similar section taken on the line 2 5, Fig. 4. Fig. 7 is an end view of the apparatus, illustrating the cool ing-hearth, and its rabble mechanism. Fig. 8 is a cross-section taken through the roasting-chamber,showing the rabble-carriage and its operating mechanism in end view. Fig. 9 is a detail view showing a specific bearing adjustment enlarged. Fig. 10 is an enlarged elevation, partly in section, of the forward extremity of the apparatus, illustrating the means for supplying the rabble-carriage with water and the construction for transmitting motion from the lower to the upper operating-shafts. Fig. 11 is an enlarged sectional view of the rear extremity of the apparatus, illustrating the manner of elevating the roasted ore from the discharge extremity of the roasting-chamber to the cooling-hearth above. Figs. 12 and 13 are detail views illustrating the mechanism for turning the rabble-sleeve on the transverse bar of the rabblecarriage. In these views the trip is shownin two positions corresponding with the direction of travel of the rabble-carriage. Figs. 14 and 15 illustrate the rabble-plows viewed in two positions. Fig. 16 is a fragmentary top view of the rear extremity of the apparatus, showing the elevator-bucket in the position designated 13 in Fig. 11.

The same reference characters indicate the same parts in all the views.

Figs. 1, 2, and 3 illustrate the complete apparatus, which is shown on three sheets for lack of space on a single sheet.

Let the numeral 5 designate the walls of the roasting-chamber, which walls are supported on opposite sides by buckstays 6. The top of this chamber is arched in the usual manner, and it may be of any desired length. Only one fire-box 7 for supplying the necessary heat for the proper calcining or desulfurization of the ore is shown. It must be understood, however, that in an apparatus of ordinary length a number of these fire-boxes will preferably be employed. They are arranged along the sides of the apparatus and communicate with the roasting or oxidizing chamber 8 by way of a lateral fine 9, the heat and products of combustion passing over a bridge-wall 10. (See Fig. 5.) The roastinghearth 12 forms the bottom of the combustion or roasting chamber, and the ore to be treated is fed to the roasting-hearth from a hopper 13 (see Fig. 4) through the instrumentality of-a feed-screw14, located in a narrow chamber 15 below the bed of the hearth and communicating with the roasting-chamber. The ore is delivered to the hearth at the forward or left-hand extremity of the roasting-chamber, referring to Fig. 1. As the ore is forced into the recess or transverse feedchamber 15 and accumulates therein it is forced upwardly by the incoming ore above the bed of the hearth and is distributed over the latter by the plows or blades mounted on the rabble-carriage, which will now be described in detail. This carriage consists of two hollow bars 16, occupying positions parallel with each other and on opposite sides of the roasting-hearth 12. The ends of these bars are closed, forming them into water troughs or receptacles, which are open at the top. These side bars are connected by hollow transverse bars 17, whose ends are open and in communication with the hollow side bars, whereby the water discharged into the side bars fills the hollow of the transverse connecting-bars and is allowed to circulate freely therethrough for cooling purposes. The water supplied to the rabble-carriage will naturally escape by evaporation within the roasting-hearth. Hence provision is made for replenishingthe water at predetermined intervals-namely, every time the carriage is moved back and forth the length of the roasting-chamber or madeacomplete trip,as willbe fullyexplained hereinafter. As shown in the drawings, upon the central hollow bar 17 is mounted a sleeve 18, arranged to turn on the bar. To this sleeve are secured on opposite sides the rabble plows or blades 19, which occupy positions diagonally or inclined to the direction of travel of the rabble-carriage. These blades or plows are so arranged that when making one trip in the rearward direction or toward the discharge extremity of the apparatus the ore is moved outwardly in both directions from the center of the hearth simultaneously with the rearward movement on the hearth,while when making the next trip rearwardly the ore is moved inwardly from the outer edges toward the center of the hearth. By this arrangement the ore while moving rearwardly toward the discharge end of the apparatus -is repeatedly turned over in opposite directions during the successive trips of the rabble-carriage in the roasting-chamber or over the roasting-hearth, whereby it is completely and thoroughly stir-red or agitated, bringing every particle into intimate contact or relation with the heat from the fire-box and the oxygen of the air, to the end that the roasting or desulfurizing function may be properly performed. To this end the rabble-plows of the right and left halves of the rabble-sleeve, referring to Fig. 4, are oppositely inclined. It will be understood by referring to Fig. 15 that there are two sets of rabble blades or plows diametrically located on the rabblesleeve, the blades of one set being parallel with those of the other set. Provision is made for turning this sleeve whereby the two sets of rabble-plows act alternately on the ore during the successive rearward movements of the rabble-carriage. Hence the blades when projecting upwardly and out of contact with the ore, are'inclined in one direction and occupy positions parallel with the downwardlyprojecting blades, will be oppositely inclined when the sleeve is given a half-turn on its axle or hollow bar 17, whereby the blades which were previously inoperative, are brought in operative relation with the ore. The rabblesleeve 18 is composed of a series of interlocking sections 18. (Clearly distinguishable in Figs. 14 and, 15, but not shown in the other figures on account of the reduced scale necessarily employed.)

A pair of diametrically-located rabble plows A or blades is attached to each sleeve-section tact therewith. Hence during the forward movement the rabble-plows are idle.

In order that a partial rotation of the rabble-sleeve may be automatically accomplished at proper intervals, a toothed wheel is made fast to the rabble-sleeve at each extremity. (See Figs. 12 to 14, inclusive.) This wheel 20 is allowed to rotate freely with its sleeve in the direction indicated by the arrowin Figs. 12 and 13, while it is locked against movement in the opposite direction by a dog 21, pivotally mounted, as shown at 22, on one of the side bars 16 of the rabble-carriage. This dog is weighted at one extremity, as shown at 23,

whereby it normally assumes the position shown by full lines in Figs. 12 and 13. Depending from .the roof of the roasting-chama her and located at each extremity thereof is a tripping device 24, pivotally mounted on the lower extremity of a bolt 25, which passes throughthe roof of the roasting-chamber and is secured by nuts on the outside. This trip 24 isprovided with a projection 24, which looks the trip against movement in the direction indicated by the arrow when the trip is in the verticalv position, as shown at Fig. 13, but allows it to move freely in i the opposite direction. Hence, assuming that the rabble carriage is traveling forward or in the direction indicated by the feathered arrow in Fig.

- 12 and the rabble-plows are inthe position indicated by dotted lines in the same figure, the toothed wheel 20 will pass under the trip, the latter yieldingreadily for the purpose. As soon, however, as the rabble-carriage begins the returnor rearward movement in the direction indicated by the feathered arrow in Fig. 13 the toothed wheel engages the trip from the opposite side, and the resistance of the latter causes the wheel. and therabblesleeve to turn one-fourth of a revolution, throwing the rabble-plows in the position indicated by dotted lines in Fig. 13. As the toothed wheel turns the dog 21 moves to the position shown by dotted lines in Fig. 12 until a tooth of the wheel has passed the holding extremity of the dog, when the latter will return to its normal position, locking the wheel and rabble-sleeve against movement in the opposite direction. As the toothed wheel 20 and the rabble-sleeve always turn in the same direction, the set of rabble-plows which is uppermost or inoperative during one rearward trip of the rabble-carriage will be lowermost or in engagement with the ore during the next rearward trip of the carriage; hence the action of the rabble-plows whereby the ore is thrown outwardly during one rearward movement and inwardly during the next rearward movement of the carriage.

The rabble-carriage is propelled by carrierwheels 26, located in pockets 27 formed on opposite sides of the roasting-hearth. The peripheries of these wheels are cogged, as shown at 26, to engage a cogged rack 16, with which the bottom or lower edge of each side bar 16 is provided. Each wheel 26 is also provided with a plain or uncogged zone 26, which is. engaged by a depending plain part 16 of each bar. The carriage is sup ported on the plain zones of the wheels, whereby the cogs of the racks and wheels are prevented from meshing tightly or pinching at the bottoms of the teeth. Hence the cogged zones of the wheels perform the propelling function and their plain portion the supporting function. Thesewheels 26 are also pro vided with interior flanges 26, which hold the side bars in operative relation on the wheels. These carrier-wheels 26 are made fast to short shafts 27, journaled in suitable bearings 28, located in openings 29," formed in the side walls of the roasting-chamber. To the outer extremities of shafts 27 are made fast beveled gears 30, which mesh with similar gears 31, fast on-1ong shafts 32, located on 1 the outside of the roasting-chamber and extending the entire length thereof on opposite sides. These shafts are connected at the'forward end of the apparatus by a transverse shaft 33, provided at its extremities with beveled gears 34, meshing with similar gears 35,

and 39, connected with the same line-shaft.

ble-carriage is made to travel back and forth in the roasting-chamber. As shown in the drawings, the straight belt engagesthe. pulley 37, has been just shifted to this position from the loose pulley 41, by a belt-shifter 42, while another belt-shifter 43, has thrown the belt 39 from'the fast pulley 36 to theloose pulley40. Both belt-shifters arefaston a rock-shaft 44, to which a crank-arm 45, provided with a weight 45 is also secured. This.

weight has atendency to, maintain the beltshifting mechanismin the desired position of &

adjustment. This weighted crank-arm is connected by means of a link 46'with one extremity of a crank-arm 47, whose opposite'extremity is fast on a shaft 48. One extremity of an arm 49 is also secured to the rock-shaft 48,while its free extremity is arranged to be engaged by a side bar 16 of the rabble-carriage. These side bars 16 of the carriage protrude from the roasting-chamber at both ends of the apparatus through openings formed in the end walls of the chamber. As the carriage approaches its limit of forward movement the forward extremity of one of the side bars 16 engages the arm 49 and imparts a partial rotation to the shaft 48, this movement being sufficient to perform the belt-shifting function through the instrumentality of the parts described. The motion of the shafts 32 is then reversed, as is also the rotation of the propelling-wheels 26 within the roasting-chamber, whereby the rabble-carriage begins the reverse or rearward movement. The rock-shaft 48 is also provided with a rocking bar 50, fast on the shaft and projecting equally therefrom in opposite directions. The extremities of this bar are respectively connected with two rods or cables 51, whose opposite extremities are connected with the extremities of a similar rocking bar 52, fast on a crank-shaft 53, located at the opposite extremities of the apparatus, and to which is also secured a crankarm 54, lying in the path of one of the side bars 16 of the rabble-carriage, as the latter approaches its rearward limit of movement. As the extremity of the side bar 16 engages the arm 54 the latter is moved sufficiently to impart a partial rotation to the rock-shaft 53, the movement of this shaft being sufficient to operate the belt-shifting apparatus through the instrumentality of the connecting-rods 51, whereby the straight belt 38 will be shifted to the loose pulley 41 and the crossed belt 39 to the fast pulley 36, whereby the rotation of the shafts 32 will be again reversed and the rabble-carriage will begin the forward movement.

The propelling-wheels 26 within the roasting-chamber are located at such intervals that one of them is always in engagement with each side bar 16 of the carriage. In addition to these propelling-wheels a number of plain or uncogged carrier-wheels 55 are employed. These wheels are located intermediate the propelling-wheels and are fast on shafts 56, journaled in bearings 28. The wheels 55 of course have no propelling function, but give additional support to the rabble-carriage.

Mounted at the front end of the roastingehamber is a transverse water-supply pipe 56, having two depending outlet branches 57, provided with valves 58, which are normally closed. These branch pipes 57 are so arranged that when the valves are open and the rabble-carriage at its forward limit of movement, the hollow bars 16 will be in position to receive the water from the said outlet branches, whereby the rabble-carriage receives a fresh supply of water every time it reaches its limit of forward movement.

For the purpose of automatically controlling the valve 58 its stem is providedwith a fast crank-arm 59. (Best shown in Fig. 10.) The valve-controlling devices are not shown in Fig. 7. The outer extremity of the crankarm 59 is connected by means of a link '60 with an arm 61 of a triple-armed lever 61, fulcrumed at 62. The other two arms of the lever are designated 61 and 61, respectively. Normally the arm 61 occupies a position in the path of one of the side bars 16 of the rabble-carriage as the latter approaches its forward limit of movement. As the carriage continues its movement the forward extremity of each side bar 16 engages a leverarm 61" and throws the lever 61 to the position shown in Figs. 1 and 10, with the arm 61 resting on the top of a hollow bar 16 and the arm 61 projecting thereinto. The normal position of the arm 61 is just above the plane of the top of the bar. The arm 61 is of sufficient width to cause it to rest on top of the side bar when the latter is in the position shown in Figs. 1 and 10. Normally this arm 61 forms a door to close the opening in the end wall of the roasting-chamber, through which the side bar of the carriage protrudes.

The movement of the lever 61, just described, actuates the crank-arm 59 sufficiently to open the valve 58 by virtue of the link conneetion between the arm and the lever, and water is discharged into the hollow'bar from the branch or discharge'pipe 57. The valveoperating apparatus just described is doubled, there being one set of mechanism for each bar 16, whereby there is a flow of water into both hollow side bars 16 of the rabblecarriage simultaneously. It will be understood that the belt-shifting mechanism heretofore described is operated simultaneously with the opening of the valves 58, whereby the motion of the shafts 32 is reversed. Hence by the time the carriage is supplied with the necessary water it will be given its return or rearward movement.

The arm 61 of each valve-operating lever when the valve is open lies in the path of the end wall of the hollow bar 16 as the carriage moves rearwardly. Hence the end of the bar 16 will engage this arm and return the lever to its normal position, closing the valve 58 and shutting off the water, returning the lever-arm 61 to position to be again actuated by the bar 16 when the carriage returns to the forward extremity of the roasting-chamher. The arm 61 of the lever is provided with a weight 61 whose tendency is to maintain the valve ina closed position. The end wall of the roasting-chamber adjacent the valve-opening lever is open, as shown at 5, to allow the hollow bar 16 of the carriage to pass out of the roasting-chamber and also to allow the bar 61 to swing inwardly simultaneously with the rearward movement of the carriage. A metal plate etis attached to this pelling-wheels 67.

end wall of the chamber and is provided with an opening, as shown at at, to register with the wall-opening. This opening in the end wall of the furnace is closed by the part 61 when the hollow bar 16 moves into the roasting-chamber.

Above the arch or roof of the roasting-chamberis located a cooling-hearth 63, which is supported by transverse I-beams 64, restingv on the upper extremities of the buckstays 6. Journaled in suitable bearings 65, mounted on the I-beams, are short shafts 66, to which are made fast propelling-wheels 67, which are substantially of the same construction as the wheels 26 of the roasting-chamber. Journaled in'bearings 6'7 are short shafts 68, to which are'made fast carrier-wheels69, which are similar in every respect to the wheels 55 of the roasting-chamber. These propelling-wheels (57 are operated by longitudinal shafts 70, geared to the shafts 66 by

beveled gears

71 and 72. Upon these propelling-and track wheels is mounted a rabblecarriage for the. cooling-hearth consisting of sidebars 73, provided with cogged racks 74, arranged to mesh with the cogs of, the pro- These sidebars are connected by transverse bars 75 in the same manner as the rabble-carriage of the roastinghearth. In fact the carriage of the coolinghearth is substantially of the same construction as that of the roasting-chamber, except coolihg-hearth carriage is movably mounted a sleeve 76, carrying rabble blades or plows 78, connected and arranged substantially the same as the corresponding parts of the roasting-hearth carriage. 'The:rabble-sleeve is provided at each extremity with a'toothed wheel 79, which is engaged by adepending tripping device 80, mounted on abar 81, supported above the roasting-hearth by standards 82, mounted on the I-beams 641. The operation of the rabble-sleeve is the same in all respects as the corresponding sleeve of the roastingchamber carriage, .and therefore need not be shown or described in detail. The coolinghearth is provided with longitudinal side bars 83 to keep the ore in place thereon during the manipulation necessary to the cooling operation.

. Motion is transmitted from one of the shafts 32 to one of the shafts by a chain 84, engaging sprocket-

wheels

85 and 86, fast on the respective shafts. The two shafts 70 are connected by a transverse shaft 87, the shafts 70 having beveled gears 88, engaging gears 89, fast on the extremities of the transverse shafts.

The manner of carrying or elevating the ore from the discharge extremity of the roastingchamber to the receiving extremity of the cooling-hearth above, as well as the construction whereby this function is accomplished, will now be described.

At the extremity of the roasting-chamber the hearth is provided with an opening communicating with an opening in the end wall of the chamber, in which is located a chute 90, provided with anormally closed hinged cutoff blade 9l,located near its discharge extremity, which protrudes through the opening in the wall of the chamber. -The chute has a width equal to the entire width of the roasting-chamber, in the rear of which is located a sprocket-wheel 92, which is engaged by an endless chain 93, which also engages sprocketwheels 94:, 95, and 96, suitably mounted above the roof of theroasting-chamber. There are two chains and two sets of these sprocketwheels,one chain and one set of wheels beingon each side of the machine. Each chain 93is operated from a shaft 70 through the medium of chain 97, engaging sprocket-

wheels

98 and 99, fast on

shafts

100 and 101, respectively. Motion is communicated to the shaft 100 from the shaft70 through the medium of

gears

102 and 103. A smaller gear lO l on the shaft 101 meshes with a similar gear 105, which in turn diate gear 105 is employed to cause the chain 93 to travel in the direction indicated by the arrows in Fig. 3 when the shafts70 are turning in a direction to cause the forward movement of the rabble-carriage. To the two chains 93 is attached a bucket 108, having a length equal to the width of the dischargechute 90. ,A quantity of ore is discharged through this chute every-time the rabble-carriage reaches its limit of rearward movement. The movement of the bucket and its carryingchains is so timed that the bucket is inposition to receive each ore discharge from the chute, this position being best shown in Figs. 3 and 1].. As soon as the ore is discharged the rabble-carriages of both the roasting and cooling hearth start forwardly, and the chains 93 travel in the directions indicated by the arrowin Fig. 3, whereby the bucket 108 iselevated. This bucket maintains its upright position until it reaches the dotted-line position A farthest to the right in Fig. 11. Its front side, which is vertical, then engages an offset 109, formed in a bar 110, mounted on the rear extremity of the cooling-hearth,whereby the bucket is tipped onto its front side or to the positionB inFig. 11, after which the top of the bucket as the latter is drawn forwardly engages an offset 112,which tips the bucket to the inverted position O,whereby theoreis du mped on the rear extremity of the cooling-hearth 63. By the time this has occurred the rabble-carriages have reached the forward exin the direction opposite that indicated by the arrows in Fig. 3, and the travel of the bucket and its carrying-chains is so regulated with reference to the travel of the rabble-carriages that the bucket just reaches its position immediately below the discharge-month of the chute in time to receive the ore discharged from the chute simultaneously with the arrival of the rabble-carriage at its rearward limit of movement in the roasting-chamber, after which the rabble-carriages begin their forward movement and the operation of ele-' vating and dumping the bucket is repeated.

The cut-off 91 in the discharge-chute opens in response to the downward pressure of the ore-charge, but closes by gravity as soon as the ore leaves the chute, thus cutting off the entrance of air to the roasting-chamber.

Attention is called to the fact that the rabble plows or blades of the cooling-hearth are arranged to carry the ore forwardly on said hearth, while the rabbles of the roastingheart-h are arranged to cause the ore to travel rearwardly thereon, as heretofore explained. In other respects the operation of the rabbles on the two hearths is precisely the same.

Having described the mechanism of my improved roasting and cooling apparatus in detail, I will proceed to describe connectedly, but briefly, the various steps in the operation of the same.

The heat from the fire box or boxes 7 enters the roasting-chamber and travels forwardly therein, the smoke and products of combustion escaping through openings E in the forward extremity of the hearth into the flue H below, whichleadstothestack. (N0tshown.) The ore to be treated is discharged into the hopper 13 and passes thence through the instrumentality of the feed-screw 14c to the forward extremity of the roasting-hearth 12, where it is acted on by the rabble-plows and caused to travel gradually toward the rear extremity of the roasting-chamber, a quantity being finally discharged at predetermined intervals through the chute 90 into the bucket 108, in which it is elevated and dumped upon the cooling-hearth, as heretofore described. As soon as the rabble-carriage reaches the rear extremity of the roasting-chamber one of the side bars 16 of the carriage engages the crank-arm 51 and operates the belt-shift ing mechanism by virtue of the connection described, whereby the motion of the shafts 32 is reversed, causing the rabble-carriage to begin its forward movement. Simultaneously with the reversing of the movement of the shafts 32 the rabble-sleeve 18 is turned one-fourth of a revolution through the action of a trip 24 to throw the rabble-plows to the horizontal or inoperative position, as shown in Fig. 14, whereby the plows in the roasting chamber are idle during the forward movement of the rabble-carriage, while the rabbleplows of the cooling-hearth carriage are adjusted to occupy the vertical or operative position, whereby the ore is caused to travel forwardly on the cooling-hearth and finally discharged at its forward extremity. During the forward movement of the rabble-carriages the bucket 108 is elevated and dumped. As soon as the roasting-hearth carriage reaches its forward limit of movement one of its side bars 16 acts on the crank-arm 49 and operates the belt-shifting mechanism to reverse the movement of the

shafts

32 and 70, whereby the carriages begin their rearward movement, and during this rearward movement the orebucket 108 is returned to its position at the discharge extremity of the chute 90 ready to receive the charge of roasted ore therefrom. Simultaneously with the operation of the beltshifting devices when the carriage of the roastingchamber has reached its forward limit of movement the valves 58 of the waterpipe branches 57 are opened through the' medium of the levers 61, which are acted on by the bars 16 of the rabble-carriage, whereby the latter is supplied with the necesssary water forcooling the carriage mechanism during a complete trip or a rearward and forward movement in the roasting-chamber. same time the rabble-sleeves of the two rabble-carriages are actuated,the one in the roastin g-chamber to throw the plows to the vertical or operative position and the one above the cooling-hearth to the horizontal or inoperative position, it being'understood that the ore is made to travel in opposite directions on the two hearths.

\Vhile the mechanism for supplying water to the rabble-carriage is shown in the drawings at one extremity only of the roastingchamber, it is evident that a similar set of mechanism may be employed at the opposite extremity of the said chamber, so that the carriage may receive a fresh supply of water at each extremity of the chamber. This is clearly within the scope of the invention and is simple duplication.

Having thus described my invention, what I claim is 1. In aroasting apparatus, the combination with a roasting chamber and hearth, of a rabble-carriage located in the roasting-chamber and comprising hollow side bars forming water-receptacles, open to permit evaporation in the roasting-chamber, a transverse bar provided with rabble plows or blades,the side bars occupying positions on opposite sides of the hearth, and means for propelling the rabblecarriage.

2. In an apparatus of the class described, the combination with a roasting chamber and hearth, of hollow side bars forming water-receptacles located on opposite sides of the hearth, a transverse bar connecting the side bars, and a sleeve movably mounted on the transverse bar, and provided with rabble plows or blades, and means for propelling the rabble-carriage.

3. The combination with a combustion chamber and hearth, of hollow side bars forming water receptacles located on opposite At the sides of the hearth, a hollow transverse. bar connecting the side bars, and having open v ends to allow the water to enter from the side I cated in the said chamber and composed of hollow side bars forming water-receptacles, hollow transverse bars connecting the side bars and open to allow the water to enter from the side bars, and rabble plows or blades mounted on one of the transverse bars, the side bars being located on opposite sides of the hearth, and suitable means for propelling the rabble-carriage.

r 5. The combination with a chamber and hearth, and asource of heat connected with the chamber, ofv a rabble-carriage composed of hollowside bars forming water-receptacles openat the top to permit free evaporation, a hollow transverse barconnecting the side bars and open to allow the water to enter from the side bars, rabble plows or blades mounted on the transverse bar, and suitable means for propelling the rabble-carriage.

(5. The combination with a chamber, a hearth, and a source of heat, of a rabble-carriage located in the chamber and composed of hollowside bars forming water-receptacles located on opposite sides of the hearth, and open at the top, the lower edges of the bars being provided with cogged racks, transverse bars connecting the side bars and open to allow the water to enter from the side bars, rabble plows or blades mounted on one of the transverse bars, and propelling-wheels suitably journaled along the sides of the hearth and provided with cogs engaging the racks of the side bars for actuating the rabble-carriage.

7. The combination with a hearth, of side bars located on opposite sides of the hearth,

'theirlower edges being partly cogged and partly plain, transverse bars connecting the side bars, rabble plows or blades mounted on one of the transverse bars, and wheels located along the sides of the hearth for supporting and propelling the rabble-carriage, the said wheels having a cogged .zone to engage the cogs of the side-bar racks, and a plain zone to engage the plain portion of the rack-bars, forming the support for the carriage, .whereby the cogged portions of the wheels are relieved of the weight and only required to perform the propelling function, substantially as described.

8. In an apparatus of the class described, thecombination with a hearth upon which ore may be spread for. roasting or cooling purposes, of side bars arranged to travel on opposite sides of the hearth, transverse bars connecting the side bars, wheelslocated along the hearth sides and engaging the side bars in operative relation for propelling purposes, a rabble-sleeve movably mounted on one of the transverse bars, said sleeve being provided with plows or blades, a toothed wheel fast on the rabble-sleeve, a pawl or dog pivotally mounted. on one of the side bars and engaging the toothed wheel to prevent rotationin one direction, and a trip located at: each extremity of the hearth for 'engagingthe toothed wheel of the rabble-sleeve and imparting a partial rotation thereto, substantially as described. and for the purpose set forth.

9..The combination with a hearth, of side bars arranged to travel along the hearth on opposite sides, connecting-bars extending transversely across the hearth, a sleeve movably mounted on one of the transverse bars, a toothed wheel fast on each extremity of the sleeve, a dog or pawl pivoted on each side bar and engaging the adjacent toothedwheel to prevent, the rotation of the latter in one. direction, and a trippingdevice suitably located to engage and actuate the, toothed wheel, whereby a partial rotation is imparted tothe. rabble-sleeve at predetermined intervals,sub-

stantially as described and for the purpose.

set forth. p

10. The combination with a hearth, of carriage side bars located and arranged to travel.

on opposite sides of the hearth, bars extending transversely across the heart-hand con-. meeting the side bars,- a sleeve movably mounted on one of the transversebars and composed of interlocking sections, rabbleplows or blades mounted on the sleeves, and means for imparting a partial rotation to the sleeve at predetermined intervals, substantially as described. 11. The combinationwith a hearth, of car'- riage side bars arranged to move on opposite. sides of the hearth, a transverse bar connect ing said side bars, a sectional sleeve mounted to rotate on said bar, each sleeve-section being provided with two rabble blades or plows diametrically located, means for lockingthe sleeve against movement in one direction, and means for impartinga partial rotation to the rabble-sleeve in the opposite direction at predetermined intervals, substantially as described.

- 12. The combination with a hearth, of side bars located and adapted to travel on opposite sides of the hearth, a bar extending transversely across the hearth and connecting the side bars, a sleeve mounted to rotate onsaid bar, rabble plows or blades diametricallylocated on opposite sides of the sleeve, the oppositely-located blades being parallel and adjustably connected with the sleeve, substantially as described.

13. The combination with a hearth, of carriage side bars arranged and adapted to travel on opposite sides of the hearth, a transverse bar connecting the side bars, a sleeve mounted to rotate on said bar, rabbleplows or blades diametrically located on opposite sides to prevent the movement of the sleeve in one direction, and a depending tripping device arranged to engage each toothed wheel and impart a partial rotation to the rabble-sleeve in the opposite direction, the tripping device being pivoted to swing freely from the vertical position in one direction, but locked against movement in the opposite direction, substantially as shown and described.

14. The combination with a hearth, of side bars located and arranged to travel on opposite sides of the hearth, transverse bars connecting the side bars, rabbles mounted on one of the transverse bars, the side bars having cogged racks on their lower edges, cogged propelling-wheels located along the sides of the hearth at suitable intervals, and engaging the side-bar racks, shafts extending longitudinally along the sides of the hearth and geared to the carriage propelling wheels, means for operating the shafts and means connected with the operating mechanism and acted on by the rabble-carriage at each end of the hearth, for automatically reversing the movement of the longitudinal shafts and carriage-propelling wheels, whereby the carriage is made to move back and forth over the hearth, substantially as shown and described.

15. In an apparatus of the class described, the combination of aeombustion-chamberand a hearth, with a rabble-carriage provided with side bars arranged to travel on opposite sides of the hearth, transverse bars connecting the side bars, rabbles mounted on one of the transverse bars, propelling-wheels located at suitable intervals along the hearth sides and engaging the carriage side bars in operative relation, shafts located outside of the chamber and geared to the propelling-wheels for operating the carriage, means for operating the shafts and means connected with the shaft-operating mechanism, located at each end and outside of the chamber, for reversing the movement of the operating-shafts, said means being actuated by a carriage side bar, the end walls of the chamber being open to allow the said bar to protrude for the purpose set forth.

16. The combination with a chamber and a hearth, of side bars located and arranged to travel on opposite sides of the hearth, a transverse bar connecting the side bars and provided with rabble blades or plows, means located outside of the chamber for operating the carriage and causing it to move longitudinally over the hearth, and means exteriorly located at each extremity of the chamberfor reversing the movement of the carriage-operating mechanism, the said reversing means being actuated by the rabble-carriage, the end walls of the chamber being provided with openings to allow the carriage side bars to protrude for the purpose set forth.

17. .In an apparatus of the class described, the combination with a combustion-chamber and a hearth, of a rabble-carrier located in said chamber and having a part arranged to protrude at each end of the chamber whose end walls are provided with openings for the purpose, means for causing the carriage to travel longitudinally, and means located at each end of the chamber and acted on by the protruding part of the rabble-carriage, whereby the carriage-operating mechanism is antomatically reversed, and the carriage made to travel back and forth in the chamber, substantially as described.

18. In an apparatus of the class described, the combination with a roasting chamber and hearth, of a rabble-carriage provided with side bars located and arranged to travel on opposite sides of the hearth,propelling-wheels engaged by the carriage side bars in operative relation, two longitudinal shafts located outside lhe chamber and connected to operate the rabblecarriage-propelling whee1s,the two longitudinal shafts being connected to operate in unison, fast and loose pulleys connected with one of the longitudinal shafts, belts for the pulleys, belt-shifting devices for reversing the rotation of the shaft, the rabbleearriage being provided with a part protruding through openings formed in the end walls of the chamber, and means located at each end of the chamber and connected with the belt-shifting devices, for operating the latter, the said means being automatically actuated by the carriage-protruding part, substantially as described.

1!). In an apparatus of the class described, the combination with a chamber and hearth, of a rabble-carriage located in said chamber which is provided with openings in its end walls, the carriage being provided with parts adapted to protrude through said openings, a shaft located outside the chamber and connected to cause the rabble-carriage to move longitudinally therein, means for operating said shaft, and means located exteriorly at each end of the chamber and arranged to be actuated by the carriage-protruding parts, for reversing the shaft-operating mechanism, substantially as described.

20. In an apparatus of the class described, the combination with a chamber and hearth, of a rabble-carriage arranged to move longitudinally in said chamber which is provided with openings in its end walls, the carriage being provided with parts adapted to protrude through said openings, a shaft located outside the chamber, means connected with and operated by said shaft for actuating the carriage in the chamber, fast and loose pulleys mounted on said shaft, belts connected with said pulleys, belt-shifting devices, and means located at each end of the chamber and connected with said devices for shifting the belts and reversing the rotation of the shaft, said means being actuated by the protruding parts of the carriage, whereby the latter is caused to travel back and forth in said chamber, substantially as described.

21. In an apparatus of the class described, the combination with a chamber and hearth,

,of a-rabble-carriage arranged to move longioutside of the chamber, means connected with and operated by said shaft for actuating the carriage in the chamber, fast and loose pulleys mounted on said shaft, belts connected with said pulleys, belt-shifting devices, a,

- rock-shaft on which said devices are mounted, an arm also fast on the rock-shaft, another rock-shaft provided with a'crank-arm, a link connecting the two arms, a third arm mounted on one of the rock-shafts, and lyingin the path of the carriage-protruding part at the end of the chamber, whereby the belt-shifting devices are'actuated and the movement of the carriage-operating shaft reversed, substantially as described.

22. In an apparatus of the class described, the combination with a chamber and hearth, of a rabble-carriage located and arranged to move longitudinally in said chamber which is provided with openings in its end Walls, the carriage having part-s adapted to protrude through said openings, a shaft located outside of the chamber, means connected with and operated by said shaft for actuating the carriage in the chamber, pulleys mounted on said shaft, belts connected with said pulleys, belt-shifting devices, a rock-shaft on which said devices are mounted and made fast, an

arm also fast on the rock-shaft, another rock-.

shaft provided with a crank-arm, a link connecting the two arms, a third arm mounted on one of the rock-shafts and lyin gin the path of the carriage-protruding part at one end of the chamber, a rock-shaft located at the opposite end of the chamber, a crank-arm fast on the last-named rock-shaft, and located in the path of the carriage-protruding parts, a rocking bar fast on the rock-shaft at each extremity of the chamber, each bar projecting an equal distance from the rock-shaft in opposite directions, and rods or cables connecting the corresponding extremities of the two rocking bars, whereby as soon as the rabblecarrier reaches its limit of movementin either direction,its operating mechanism is reversed and it is caused to travel in the opposite direction.

23. The combination with a roasting or dryingv chamber, and a suitable hearth, of arabble-carriage movable longitudinally in the chamber and provided with hollow side bars forming water-receptacles, a hollow transverse rabble-bar connecting the side bars and open to allow the water from the side bars to enter, and a valve-controlled water-supply conduit located exteriorly at one end of the roasting-chamber, for supplying the carriage withwater, thevalve of the conduit being automatically opened by the movement of the carriage.

24. The combination with a roastin g or drying-chamber and a hearth, of a rabble-carriage located in said chamber and adapted to hold water, means for operating the carriage, whereby it is made to travel back and forth in said chamber which is provided with openings in its end walls, the carriage having a part adapted to protrude through said openin gs, a valve-controlled water-conduit located outside the chamber, and means for opening the valve, said means being actuated by the protruding part of the carriage, which protrudin g part is connected to receive the water and conduct it to the other carriage parts.

. 25. The combination with a roasting chamber and hearth, of a rabble-carriage adapted .to move back and forth in said chamber and provided with hollow side bars forming waterrecep'tacles, the end wall of the chamber being open to allow the said bars to protrude, a hollow rabble-bar connecting the side bars and open to allow the water from the side bars to enter, a water-supply conduit exteriorly located at one end of the chamber, a valve for controlling the discharge of water from said conduit, operating means connected with the valve, said means being actuated by aprotruding side bar of the carriage, whereby the Valve is automatically opened and closed at predetermined intervals, the said bar bein g in position to receive the-necessary water for supplying the carriage.

26. In an apparatus of the class described, the combination with a roasting chamber and hearth, of a' rabble-carriage located therein and adapted to move back and forth, said carriage having side bars forming Water-receptacles open at the top, and a hollow transverse bar connecting the side bars andcommunicatingtherewith to permit circulationof water, rabble blades or plows mounted on the transverse bar, one end wall of the roasting-chamber having openings to allow the hollow side bars to protrude, a water-supply conduit exteriorly located, a valve for controlling the discharge from said conduit, and means connected with the valve and lying in the path of the free extremities of the side bars, whereby the said valve is operated, substantially as described. 7

27. In anapparatus of the class described, the combination with a roasting chamber and hearth, of a rabble-carriage constructed to hold water and provided with a part adapted to protrude from the end of the chamber the latter being provided with an opening for the purpose, an eXteriorly-located water-supply device, a valve connected with said device and arranged to be opened by the protruding part of the rabble-carriage when travelingin one direction, and closed by said part when traveling in the opposite direction, substantially as described.

28. The combination with a chamber and hearth, of a rabble-carriage adapted to hold water and being arranged to protrude from the end of the chamber whose wall is provided with an opening for the purpose, a water-supply conduit exteriorlylocated and pro IIO vided with a valve, a lever connected with the valve and lying in the path of the protruding part of the carriage, whereby the lever is actuated to open the valve when the carriage is moving in one direction, and to close the valve when the carriage is moving in the opposite direction, substantially as described and shown.

29. The combination with a roasting chamber and hearth,of a rabble-carriage constructed to hold water and provided with a part adapted to protrude from the roasting-chamber and conduct water to the portion of the carriage within the chamber, the latter having an opening in its end wall to allow the said parts to protrude, water-supply means provided with a valve controlling the discharge-opening, a lever connected with said valve and provided with two arms, one of which lies in the path of the carriage-protruding part when it is moving in one direction, whereby the lever is actuated to open the valve and allow the water to flow therefrom into the protruding part of the carriage, the other lever-arm being thrown to a position to be engaged by the carriage during its movement in the opposite direction, whereby the valve is closed.

30. The combination with a roasting chamber and hearth, of a rabble-carriage located therein and adapted to move back and forth as described, the said carriage having a protruding part adapted to receive and conduct water to the other parts of the carriage, the said part being open to permit the escape of water by evaporation in the roasting-chamber, the end wall of the chamber having an opening to allow the said part of the carriage to pass through, substantially as described.

31. The combination with a chamber and hearth, of a rabble-carriage adapted to hold and retain water and .permitting escape only by evaporation, said carriage having a protruding part adapted to receive and conduct water to the parts of the carriage Within the chamber, and a water-supply source provided with avalve arranged to be opened and closed by the protruding part of the carriage as it moves in opposite directions, substantially as described.

32. The combination with a chamber and hearth, of a carriage arranged to move back and forth in said chamber and provided with a protruding part adapted to receive water and conduct it to the other parts of the carriage which is constructed to contain water, permitting escape only by evaporation, a water-supply source located outside the chamber, a valve controlling the discharge from said source, a triple-armed lever, one arm of which is connected with the valve, another arm lying in the path of the carriage-protruding partas it moves forwardly or out of the chamber, whereby the lever is actuated to open the valve, the third lever-arm being thrown by said action into the path of the protruding part as it moves in the opposite direction,whereby the lever is actuated to close the valve.

33. The combination with a roasting chamber and hearth, of a rabble-carriage located in the chamber and constructed to hold water and permit escape by evaporation, said carriage having a protruding part adapted to receive water from a source outside of the chamber, and conduct it to the portion of the carriage within the chamber, and means located outside the chamber and automatically controlled by the carriage-protruding part, whereby the carriage -is supplied with water while the said carriage part is outside of the chamber, the water discharge being cut oit when the said part moves into the chamber.

34. The combination with a roasting chamber and hearth, ot' a rabble-carriage arranged to move back and forth within the chamber, the said carriage being constructed to hold water and permit escape by evaporation, the said carriage having a protruding part adapted to receive and conduct water from a point outside the chamber to the portion of the carriage within the chamber, the wall of the chamber having an opening through which the said carriage part passes, a water-supply source located outside the chamber and provided with a valve, a crank-arm attached to the valve-stem, a triple-armed lever, one arm of which is connected with the valve-crank, another arm located in the path of the protruding part as it moves out of the chamber, whereby the lever is actuated to open the valve and allow the water to pass into the protruding part of the carriage, the third arm of the lever being thrown into the path of the carriage protruding part as it moves in the opposite direction orinto the chamber,whereby the lever is actuated to close the valve.

35. The combination with a chamber and hearth, of a rabble-carriage arranged to move back and forth within the chamber and over the hearth, the said carriage being adapted to hold water and permit its escape by evaporation, the carriage being also provided with a protruding part adapted to receive water and conduct it to the part of the carriage within the chamber, the wall of the chamber having an opening to allow the carriage protruding part to pass outside the chamber, a watersupply source located outside the chamber, a valve controlling the escape of water from said source, a crank connected with the valve, a lever, a link connecting the said crank with one arm of the lever which is provided with another arm lying in the path of the protruding part as it moves out of the chamber, whereby the valve is opened, the lever having a third arm which is engaged by the carriage protruding part as it moves in the opposite direction, whereby the valve is closed.

36. The combination with a roasting chamber and hearth, and a cooling-hearth located above the roasting-chamber, of a discharge-