US1199962A - Sintering-machine. - Google Patents

Description

S. P. C. BORSON.

SINTERING MACHINE.

APPLICATION FILED AuG.23. Isls.

m: Namws Pneus m.. nuoro uma. Insmm; nw. u. I:

S. P. C. BORSON.

SINTERING MACHINE.

APPLICATION FILED Aus.23, 1915.

Patented 06f. 3, 1916.

4 SHEETS-SHEET 2 INVENTOR.

WITNESSES:

mr mmms uns co., mmm-Ll ma wasnmclox. n c.

S. P. C. BORSON.

SNTERING MACHINE.

APPLICATIQN FILED AuG.23. 1915.

Pnted om. 3, 1916.

4 SHEETS-SHEET 3 IN VEN TOR.

mr mmm.: mens ca.. Maurad num wAsmNc mm. n, c.

NNY

S. P..C. BORSON.

SINTERING MACHINE.

APPLICATION man M1923, 1915.

Patented Oct. 3, 1916.

4 SHEETS-SHEET 4 IN V EN TOR. f

SCPI-IUS l?. C. BGRSON, 0F SALIDA., COLORADO.

sINTEniNe-MACHINE.

Specification of Letters Patent.

Patented oet. s, raie.

Application led August 23, 19115. Serial No. 46,959.

To all whom it may concern:

Be it known. that I, SoPHUs P. C.` BOR- soN, a citizen of the United States, residing at Salida, in the -county of Chaffee and State of Colora'dmhave invented a new and useful Sintering-Machine, of which thel fcllowing is a specification.

My invention relates to an improved sintering machine, or. furnace, in which a movable ore carrier operates in conjunction with a stationary ore retainer; and the objects of my invention are, first, to provide a solid or impervious bed member designed to prevent the leakage and escape of ore under treatment; second, to providea furnace in which there are no grates or perforated plates in the path of the hot, fumeladen gases, thus preventing the formation of fused deposits in the air passages; third, to provide cutters for automatically cutting the sintered ore into cakes of uniform size; fourth, to provide a furnace equipped with means for self-ignitionv of the ore under treatment, thereby eliminating the expense of hand firing and the cost of fuel for igniting purposes; fifth, to provide a furnace in which the combustion supporting air is delivered under pressure higher than the atmospheric and the products of combustion discharged directly into a flue or chimney leading to the atmosphere, thereby enabling me to use a small pressure blower instead vof a large exhaust fan; sixth, to provide means for automatically prelieating the combustion supporting air, thereby facili- 'tating combustion andV increasing the elficiency of the furnace; and seventh, to reduce the cost of sintering ores by producing a. machine with few andy simple working parts, and having all its working surfaces faced with liners or wearing plates,

and which automatically performs a num-` A-A, Fig. 2; Fig. 2, is a horizontal view,Y of the operating mechanism and its sup-jp..

ports as it would appear from above wit the furnace portion removed;` Fig. 3, is horizontal section ofuthe furnace taken ci the line B-B, Fig. 1; Fig. 1l, is part elevation and part section taken approximately on the line C-C, Fig. 1, showing the cutter construction; since the machine is symmetrical about its center line only one side has been shown in this view; Fig. 5, is a vertical section of the cutter, its guides, and thel method of supporting the latter, taken cn' the line D D, Fig. a; Fig. 6, is a vertical section of the furnace, its supports, and air conductors, taken approximately on -the line E-E, Fig. 1; Figs. 7 and 8, are enlarged views of two types of sliding jointsy formed by the bottom and side members of the furnace; Fig. 9, is a vertical section of a spring, for tripping the detaching hooks 8'( and 88p; Fig. 10, is part section and part elevation of the cutter operating mechanism, vtaken approximately on the line F-F, Fig. 1; Fig.l V11, is a horizontal view of -a modified operating mechanism as it would appear from above with the furnace removed; Fig- 12, is a side elevation of the operating mechanism taken on the line H-H, Fig. 11, with a portion of the frame broken away to show the gears and clutch shifter; Fig. 18, is a view in perspective showing the construction of the detaching hooks 87 and 88; Fig. 14, is a side elevation of the detaching hook 197, and the bracket 200, with which it engages;

Fig. 15, is a vertical section of the furnace taken approximately on the line K-K, Fig.

3, the left half showing the construction of the igniter, and the right half the construction of the ore receiver.; Fig. 16, is a vertical section of a modified construction of air conductors, taken approximately on the line L-L, Fig-1, in a .direction opposite to the spurs orl arrows; Fig. 17, is an enlarged detail of the joint formed by the side and end members of the ore receiver, taken on the line M-h/I, Fig. l; Fig. 18, is a vertical section through the igniter, taken on the line N-N, Fig. 3; Figs. 19 and 20, V

are vertical sections of a declutching mechanism, shown in different positions; Fig. 21, is a vertical section taken on the line P'-.P, Fig. 20, with the cam 214i, removed; Fig. 22, is a section taken ong-the line R-R, Fig. 11, showing the clutch shifter bracket 14.8; Fig.

.28, shows the construction of the bearing in the upper end of the rocker arms 83 and 84;' Fig. 24, shows the joint formed by the rier; Fig. 25, is an enlarged view of a modilied type of sliding joint formed by the bottom and .side members of the furnace; Fig'.

links 113, and the rails 2, of the ore carllo 26, is a diagram illustrating the operation of the mechanism shown in Figs. 27 to 31, inclusive; Fig. 27 is a side elevation, partly in section, of a rocker shaft and spring connecting rod forming part of the operating mechanism shown in Fig. 28; Fig. 28, is a horizontal view of a modified operating mechanism as it would appear from above, with the furnace removed, the center line of the furnace coinciding with the center lines of the rods 259 and 263; Fig. 29, is a side elevation, partly diagrammatic, of the mechanism shown in Fig. 28; Fig. 30, is a detail of the rocker shaft 236, and its arms; and Fig. 31, is a detail of the double link 246. In Figs. 2 and 11, the outline of the ore carrier is indicated by the broken and dotted lines S, S.

My invention is composed of the following elements, which will be described in the order named: first, ore carrying element; second, ore retaining element; third, supporting means; fourth, fume chamber; fifth, air conducting and air preheating means; sixth, ore igniting means; seventh, combustion producing means; eighth, sliding joint between ore carrying and ore retaining elements; ninth, ore carrier operating means; and tenth, cutters and cutter operating means.

vSimilar characters refer to similar parts throughout the several views.

The ore carrier consists of the bed plate 1, Figs. 1,4, e, 7, s, 1o, 12, 15, '22, 24, 25 and 27, rigidly secured to and supported by rails or beams 2, and preferably provided with a liner or face plate 3, bolted to the bed plate 1, Figs. 7 and 8, and designed to protect the latter from Wear which would result from contact with the ore under treatment. The bed plate 1, is preferably built up of uniform sections or units as shown in Figs. 1 and 3; the joints being indicated in Fig. 3, by the dotted transverse lines 4. The liner 3, is omitted in Fig. 1, but is shown in Fig. 3, in three sections, the joints being indicated by the full transverse lines 5; it may, however, be 4constructed in any convenient number of sections greater or less than three, but to secure rigidity the liner sections should break joint with the bed plate sections, as indicated in Fig. 3.

The ore retaining element includes: an ore receiving section, an ore igniting section, a combustion section, and a discharge or cutter section, each of which will be described separately.

The combustion section consists of the side walls 6, Figs. 1, 3, 6, 7 and 8,. preferably faced with liners 7, bolted to the side walls 6, Figs. 7 and 8, and designed to protect the latter from wear which would result from contact with the ore under treatment. The side wall 6, is constructed with projecting end flanges 8, top flanges 9, and bottom flanges 10, constructed to form a series of air chambers or cells, of which the wall 6, forms one side, and a cover plate or door 11, the other; the cover plates 11, may be made air tight by means of packing material 12, Figs. 7 and 8, and are secured in position in any convenient manner. One type of fastener is shown in Fig. 7; it consists of a slotted or forked lug 13, rigidly secured to the cover plate 11, and an eye bolt 14, secured to the flange 10, (or 9), by means of a bracket 16, and provided with a nut 15. A sufiicient number of these fasteners may be placed along top and bottom of the cover plates. The cells or air chambers are made air tight except for the air inlets and outlets to be hereinafter described. The combustion chamber formed by the ore carrier and the side walls 6, is preferably composed of a number of uniform sections or units, as shown in Figs. 1 and 3.

The ore igniting section consists of the side walls 17, Figs. 1, 3, 15 and 18, which may be faced with liners 18, bolted to the side walls 17, and adapted to protect the d latter from wear which would result from contact with the ore under treatment. The `side walls 17, and liners 18, are provided with air passages 19, inclined backward, in-

ward, and downward, the outlet end communicating with the igniting chamber,

formed by the ore carrier and the side walls 17, and the inlet end communicating with the air chamber formed by the end walls or iianges 8, top flange 9, bottom fiange 10, vcover plates 11, and the side walls 17; the covers 11, may be secured in place and made airtight in the manner shown in Fig. 7. Additional air passages 20, may be provided las shown in Figs. 1 and 3.

The ore receiving section, or ore receiver, consists of the side walls 21, Figs. 1, 3 and 15, preferably faced with liners 22, and provided with flanged ends 8; a front wall 23, rigidly secured to the side walls 21, and provided with a flange 24; and a back wall 25, rigidly secured to the side walls 21. To `prevent leakageY of ore, two types of joints are illustrated, either of which may be used. The rst consists of a slide 26, Figs. 1 and 3, secured to back wall 25, with bolts in slotted holes, permitting of vertical adjustment, and having near the bottom edge packing 27, rigidly secured to the slide 26, by a clamp 28.` The second type of joint, Figs. 1, 3 and 17 consists of a plate 29, rigidly secured to the bed plate 1, and provided with 1packing 27, and clamps 28, similar to the packing and clamp above described, but placed vertically instead of horizontally.

The discharge or cutter section consists of side walls 30, Figs. 1, 3 and 4, preferably l,faced with liners 31, and provided with end fianges 8.

The individual sections of the ore retainer are rigidly secured to supporting members 32, Figs. 1, 3 and 6, by means of bolts 33; and the supporting members 32, are rigidly mounted on and secured to frame beams 34, by means of bolts 35, Fig. 1.

The ore carrier and ore retainer are preferably erected at an angle with the horizontal, in order to reduce the stresses in the operating mechanism; the angle of inclination is determined by the angle of repose of the-material to be treated; and the frame members 34, are preferably erected parallel with the ore carrier and ore retainer, as shown in Fig. 1. The frame beams 34, are rigidly mounted on footings or pedestals 36, Fig. l., which may be constructed of inasonry, concrete, or metal; and the line T`-T, Fig. 1, may be taken to represent the top of a footing in which are embedded or supported the lower ends of the frame beams 34, and upon lwhich are mounted the pedestals 36, and other machinery bases or supports to be hereinafter referred to. The ore carrier is supported on rollers or sectors 37, Figs. 1 and 6, grooved and flanged to receive the heads of the rails 2, and rigidly mounted on shafts 36, journaled in bearings 39, which are bolted to the supporting members 32.

A fume chamber having side walls 40, and top 41, Figs. 1, 6, and 16, and outlet or flue connection 42, Fig. 1, is mounted directly above the igniting and combustion chambers, and rigidly secured thereto by means of bolts; the joints may be made air tight by means of refractory packing 43, Fig. 6. The walls 40, may be pierced by peep holes covered by doors or plates 1, of transparent, or other material.

rThe air conducting and air preheating means consist of a header 44, Figs. 1 6 and 15, provided with distributing pipes 45, secured at one end to the said header, and at the other end to the top wall 9, of the air chambers. Each distributing pipe is provided with a valve 46, by means of which the admission of air to the air chambers may be regulated. QA modified form of header 52, embodying my invention, is shown in transverse section in 16; the. longitudinal section being similar in outline to the header 44, shown in Fig. 1. The bottom of the header 52, is formed by the top sheet 41, of the fume chamber, to which are secured side walls 48, and top wall 49; all joints being made air tight. Distributing pipes 45, may lead from the side of the header 52, or a modified form of distributing pipe may lead from the bottom of the header and enter the fume chamber before connecting with the air chamber.. A baffle plate 50, Figs. 1 and 6, constructed of refractory material, may be placed above a portion of the furnace to force the gases of combustion to travel through the ore in a longitudinal direction, thereby reducing the amount of dust carried into the flue. A blowerl connection 51, is shown in elevation in Fig. 1, and in section in Fig. 16. A. modified form of blgower connection 47, is shown in Figs. 1 and 6. The blower connection 47, is best .adapted for use with the header 44; while the blower connection 51, is best adapted for use with the header 52.

The ore igniting means comprise the ieader 44, or 52, with its blower connection 47, or 51, distributing pipes 45, or 45, regulating valves 46, the air chambers formed by the walls 8, 9, 10, 11 and .1.7, means for preventing the leakage of air, and the air passages 19 and 20.

rI he combustion producing means comprise the header 44, or 52, with its blower connection 47, or 51, distributing pipes 45, or 45', regulating valves 46, the air chambers formed by the walls 6, 8, 9, 10 and 11, means for preventing the leakage of air, and the air passages 53, Figs. 1, 7 and 8, connecting the said air chambers with the combustion chamber. Additional air passages 54, Figs. 3 and 6, may pierce the side walls 6, and liners 7. For convenience in illustrating, the passages 54, are shown in one side wall only; they may, however, be provided in both side walls; and may or may not run` the entire length of the said side walls.

Air tight sliding joints are formed at the intersection of the ore carrier and ore retainer. As shown in Fig. 7, the joint is made air tight by a strip of refractory packing 55, which may, or may not, be flexible or elastic, and which extends from 4the head end of the machine to a point near the line (1M-C, Fig.l 1, at the discharge end. The said packing is provided with a flange 56, confined in a groove in the bed plate; and is secured in position by the liner 3, on one side, and by the bracket 57, on the other. The bracket 57, extends the entire length of the packing 55, but is preferably made of several abutting sections; each section being secured in position by two or more cap screws or studs 5S. Slotted holes 59, in the bracket 57, provide for lateral adjustment of the latter to compensate for wear and expansion. A slight clearance space 60, permits the liner 3, to expand laterally without danger of cutting or crushing the packing A liner 61, rigidly secured by means of screws 62, to the projecting flange of the side wall, is preferably provided to protect the latter fromv wear. A modiiied form of sliding' joint embodying my invention is shown in Fig. 8. As shown here7 the packing 63, is firmly clamped between the bracket 65, and the liner 64, designed to protect the said packing from exposure to high temperature and wear, by means of cap screws, studs, or bolts 66. The functions of the slotted holes 59, cap screws or studs 58, and clearance space 67, have been explained in connection with Fig. 7. A series of flexible springs 68, comparatively narrow in the direction perpendicular to the paper, may be provided to keep the packing in contact with the liner 61. The springs 68, are secured in position by cap screws or studs 69, by means of which the tension in the said springs may also be regulated. The tvo types of joints are shown in Fig. 6, merely for the purpose of illustration; in practice the machine will preferably be constructed Vwith one type of rjoint only.

Another modification of an air tight sliding joint, embodying my invention, is shown in Fig. 25. rlhe bottom liner is similar to the liner 3, hereinbefore described, eXcept that in this case it is constructed with side flanges 272, adapted to protect the packing 270, from wear and high temperature. The bracket 271, lis similar to the bracket 57, hereinbefore described, except that the face in contact with the packing is made to conform to the contour of the latter. The packing is preferably made of flexible, refractory material; it is provided with a flange 56, confined in a groove in the bed plate 1, and with a. head containing a tubular space 278, running the entire length of the packing. Tie tube 273, may be made air tight, and Filled with air under pressure sul'licient to produce proper working contact between the rubbing surfaces, consisting` of the packing and the liner 61. Or the said tube may be filled, or partly filled, with any other substance adapted to createa pressure and to produce proper working contact of the rubbing surfaces. 0r the walls of the said head may be made of material sutliciently springy to produce the proper working contact of the rubbing surfaces. The packing shown in F ig. 25, may also be used in Fig. 8, in connection with the liner 611, bracket 75, and springs 68; when so used the flange 56, would be omitted.

r1`he ore carrier operating means consists of a mechanism adapted to produce a comparathfely slow advance motion and a comparatively rapid return motion. In Fig. 2, the position of the ore carrier is indicated in outline by the broken and dotted line S, S. ln the mechanism shown in F iOs. 1 and 2, a drive shaft 70, journaled in bearings 71, cv rries a speed reducing gearing, which may consist of a worm 72, meshing with a worm gear 73, rigidly mounted on an eccentric shaft 7%, which is journaled in bearings 75, supported by and bolted to the frame beams and in bearings 76, formed on the worm gear housing 77. A balance wheel or belt pulley 78, is rigidly mounted on the drive shaft 70. Rigidly mounted on the shaft 74, are eccentrics 79 and 80, provided with ec- .Centric rods 8l, operatively connected by means of pins or bolts 82, to rocker arms 83 and 84, which are rigidly mounted on rocker shafts 85, journaled in bearings 86. The upper end of rocker arms 83 and 84, carry detaching hooks'87 and 88, adapted to engage and disengage lugs or brackets 89 and 90, which will be described more fully hereinafter. The hooks 87 and 88, are identical, and the description of one will cover both. Referring to Fig. 13, the detaching hook is provided at one end with a hardened steel block 91, secured in place by a screw 92, and at the other end with two lugs 93, provided with holes 911, adapted to receive a shaft 95, rigidly secured to the lugs 93, in any convenient manner; as, for instance, by means of a pin 96, through each lug. Between the lugs 93, is formed a slot 97, adapted to receive the end of the rocker arm 83, or 84:), a detail of whichis shown in Fig. 28. The shaft 95, carries at its ends rigidly secured release cams 98, preferably screwed on the shaft ends with right and left hand threads respectively, and locked by means of pins 99. At stated intervals the cams 98, engage releasing springs 100, shown in Figs. 1, 2 and 9. lThese springs are provided with means for increasing or decreasing the spring tension, thereby advancing or retarding the point of release. Any convenient type of adjustable spring may be used. One type is shown in Fig. 9, which consists of the spring proper 101, confined in a housing 102, one end of which is threaded and provided with an adjusting screw 103, having at one end a key socket 104:, and at the other end a pin 105, adapted to enter the coils of the spring. The other end of the housing 102, is provided with a circular retaining liange 106, and forms a slide for a tappet, consisting of a pin 105, a cylindrical collar 107, and a hardened face 108. The housing 102, is mounted on a standard terminating in a base 109, provided with bolt holes 110. For convenience in illustrating, the four Arelease springs 100, are shown mounted directly above theframe beams 341-; ,it is, however, preferable in practice to construct and mount the springs nearer the center of the machine in order to have the shaft 95, as short as possible. The rapid return motion is produced by springs 111, Figs. 1 and 2, reacting on bell cranks 112, operatively connected through links 113, to the ore carrier. rThe springs are provided with any convenient form of adjustment for varying the spring tension. In the arrangement shown, the spring seat 114, is secured to a threaded stem 115, extending through a hub 116, of the base or pedestal 117; an adjusting nut 118, serves to raise or lower the stem 115, and a loc-k nut 119, locks the said stem in place after adjustment is made. The cap 120, is provided with two jaws 121, spaced to forni a slot which serves as a guide for the lower end of the bell crank 112.

The upper end of the bell crank is operatively connected to two links 113, by a bolt or pin 122; and the links 113, are operatively connected to the ore carrier supporting rails 2, by a bolt or pin 123, Fig. 2 4, seated in two blocks 12,4, bolted to the'rails 2. The bell crank is provided with a hub 125, rigidlv mounted on a shaft 126, journaled in bearings 127, bolted to and supported by the frame members 34. Two of' these springs and bell cranks are lillustrated, but the purpose of my invention may be accomplished by using a greater or less number. To stop the ore carrier, without shock, at a predetermined point, recoil springs 12,8, Figs. 1 and 2, may be placed on and secured to the frame beams 34, and may be provided with adjustment and housings similar to those shown in Fig. 9. Recoil brackets 129, bolted to the ore zcarrier supporting rails 2v, and adapted to engage tappets 130, on the springs 128, transmit the reaction of thelatter to the ore carrier. The operating mechanism aboye described will for convenience be referred to as operating mechanism No. l.

A modified form of ore carrier operating mechanism embodying my invention is shown in Figs. 11 and 12. The drive shaft 70, bearings 71 and 7 6, worm 72, worm gear 7 3, worm gear housing 77 balance wheel or belt pulley 78, and frame beams 34, are the Same as shown in Figs. 1 and 2. F or the sake of clearness of illustration the ore carrier has been omitted in F ig. 11, its position` being indicated in outline by the broken and dotted lines S, S. Referring to Figs. 11 and 12, the worm gear 7 3, is rigidly mounted on clutch shaft ,carrying a reversing clutch. Any standard type of reversing clutch may be used, but for the sake of clearness of illustration a double jaw clutch is shown. lt comprises the sleeve 131, slidably mounted on the end 132, of the clutchshaft, and compelled by means of a 'feather to rotate with the same; the clutch 133, formed on the hub of a pinion 134, rotatably mounted on the shaft 132; and the clutch 135, rigidly mounted on the end 136, of the clutch shaft. The end 132, of the clutch shaft is journaled in bearings 76; and the end 136, of the clutch shaft, in two bearings 137, bolted to and supported by the frame beams 34. The two bearings 137 are identical, and symmetrical with respect to their supports 34, and only one is shown; the shaft being broken off near the face of the omitted bearing. A clutch shifter provided with forked ends 138 and 139, operatively connected tosleeves 131, and 140, respectively, is mounted by means of the hub 141, and pin 142, on supporting framework 143, supported on one side by the frame beams 34, and on the other by the footing T T, Fig. 1.- A Shifter bar 144, slidably mounted in bearings 145, and

provided with a rigidly attached sleeve 140, carries springs 146 and 147, confined between the ends of a. shifter bracket 148, and collars 149, secured to the bar 144, by set screws; the bracket 148, is bolted to the ore carrier by bolts 150, Figs. 11 and 22. The end 136, of the clutch shaft, carriesarigidly attached lever or crank 151, operatively connected by a bolt or pin 152, to links 153, which are operatively connected through a. bolt or pin 154, to a bracket 155, bolted to the ore car` rier. Meshing with the pinion 134, is a gear 156, rigidly mounted on a shaft 157, journaled in bearings 158, supported by the frame members 34, and 143. The shaft 157, carries a. rigidly attached lever or crank 159, operatively connected by a bolt or pin 160, to links 161, which are operatively connected through a bolt or pin 162, to a bracket 163, bolted to the ore carrier. rlhe operating mechanism shown and described in Figs. 11 and 12, will be referred to as operating mechanism No. 2, and may be operated alone to advance and return the ore carrier, or it may be operated in conjunction with the rapid return motion and recoil mechanism 111 to 130, inclusive, Figs. 1 and 2.

Another modification of the ore carrier operating mechanism embodying my invention is shown in Figs. 26, 27, 28, 29, 30 and 31. The drive shaft 70, bearings 71, balance wheel or pulley 78, and speed reducing gearing 72,73, 76 and 77, are the same as in Figs. 1, 2, 11 and 12. rigidly mounted on a shaft 232, journaled in bearings 76, on the gear 1n'ousing 7 7, and in a bearing 2,33, bolted to the frame beams 34. A gear 234, rigidly Vmounted on the shaft 232, meshes with an idler 235, rotatably mounted on a rocker shaft 236, and confined between two collars 237, secured in position by set screws; or the said idler may be mounted by any means commonly em ployed for the purpose. The idler 235, meshes with a gear 238, rigidly mounted on a shaft 239, ournaled in bearings 240, bolted to the frame beams 34. To avoid crowding, the frame beams 34, are not shown in Fig. 28; and the gears 234, 235, and 238, are indicated by their pitch lines in Fig. 29; the arrows indicating the respective directions of rotation. A crank 241, is rigidly mounted on the shaft 232, and operatively connected by a bolt or pin 242, to a link 243. A crank 244, is rigidly mounted on the shaft 239, and operatively connected by a bolt or pin 245, to a. double link 246, Fig. 31, constructed to form a slot 247, in which the link 243, is adapted to move. The links 243, and 246, are operatively connected to a pin 248, rigidly mounted in and secured to a crosshead 249, adapted to slide in the crosshead guide 250, formed in one end of a rocker arm 251, rigidly mounted on and secured lto the rocker shaft 236. The shaft 236, is jour- The worm wheel 73, is i the rocker shaft 236, is shown operatively connected with the ore carrier bed plate 1, through the bracket 256, and a spring connecting rod, which may be constructed in any convenient manner.

in the present case, the spring connecting rod consists of a rod 259, operatively connected to the pin 258, and provided with a head 260, having holes adapted to receive the threaded rods 261, provided with adjusting nuts 262, by means of which the return stroke of the ore carrier may be regu-A lated. Uperatively connected to the pin 255, in lever 253, 1s a rod 263, slidably mounted in the spring 265, and provided with a head l264, constructed to forni a seat for one end of the said spring 265, the other end of which reacts on a seat 266, having an opening 267, through which the rod 263 moves, and provided with holes adapted to receive the rods 261. In Fig. 27, the spring details are shown partly in section in order to more clearly show the construction thereof; and in Fig. 28, a portion of the spring details are broken away to expose the mechanism below. The center line of the ore carrier preferably coincides with the center lines of the connecting rods 259 and 263, Fig. 28. The mechanismv described in connection with Figs. 26 to 31, inclusive, will be referred to as operating mechanism No. 3.

Cutters and cutter operating means are shown in Figs. 1, 2, 3, 4, 5, 10 and 14. The cutters consist of blades 164, bolted to blade holders 165, by bolts 166, and are slidably mounted in guides 167 and 168, bolted to the side walls 30, by bolts 169, and to brackets 17 0, by bolts 171, Fig. 4. Blades 164, register with slots 172, through the side walls 30, and\ liners 31. Toggles, Figs. 2 and 4, are formed by links 173, and pins or bolts 174, 175 and 176. Shackles 177, are operatively connected to the toggles by the pins 175, and to connecting rods 178, by pins or bolts 179. Relief springs may be providedto protect the cutters from injury, and for this purpose any convenient form of adjustable spring may be used. In the type shown in Fig. 4, a lug 180, having a hole or bearing for the pin 176, is provided with a circular cap 181, slidably mounted in a cylindrical guide 182, and in contact with one end of a compression spring 183, the other end of which reacts on a cylindrical seat 184, provided with a threaded stem 185, carrying a lock nut 186; the guide 182, is provided with a circular flange or collar 187, adapted to enga-ge and retain the cap 181, and is secured to the bracket 170, by key 188, and bolts 189. The drive shaft 70, Figs. 1, 2, 11 and 28, carries a gear 190, meshing with a gear 191, rigidly mounted on the shaft 192, journaled in bearings 193, supported by and bolted to frame beams 34. Rigidly mounted on the ends of shaft 192, are crank disks 194, carrying crank pins 195, journaled in bearings 196,

in the connecting rods 178. For engaging and disengaging the cutter operating mechanism a detaching hook 197, Figs. 1, 2, 10 and 14, operatively connected to a lever 198, by a bolt or pin 199, engages and disengages a lug or bracket 200similar to brackets 89 and 90, hereinbefore mentioned. Fach bracket 89, 90 and 200, (see Figs. 10 and 14), is provided with a hardened steel block 202, secured in place by a screw 203, and is secured to the ore carrier by bolts 204. rIhe detaching hook 197, is provided at one end with a hardened steel. block 205, secured in place by a screw 206, and at the other end with a hub 207, forming a bearing 208, for the pin 199, and slotted to receive the end of the lever 198. The detaching hooks 87, 88 and 197, are held in contact with their respective brackets by springs 201, Figs. 1 and 10. One side of hub 207, is extended to form a lug 209, having a hole or bearing 210, adapted to receive a bolt or pin 211, mounted in one end of a tappet rod 212, Figs. 1, 2 and 10, the other end of which is provided with a Hanged head 213, one flange of which slides in a grooved guide, Figs. 1, 2, 19, 20 and 21, and the other flange of which is adapted to engage and disengage a tripping cam 214, Figs. 1, 2, 10, 19 and 20, rigidly and adjustably mounted on the shaft 192, and secured to the latter by one or more set screws 215, Fig. 10, recessed into the hub 216, of the said tripping cam. The lever 198, is rigidly mounted on a clutch shaft 217, Figs. 1, 2 and 10, journaled in bearings 218, bolted to frame beams 34, by bolts 219. The shaft 217, is held in lateral adjustment by collars 220, and carries at one end a rigidly attached clutch shifter 221, provided with pins or rollers 222, adapted to engage a groove 223, in the hub of a clutch mounted on the drive shaft 70. Any standard type of clutch may be used, but it must be provided with a spring 224, Figs. 1 and 2, or similar means for normally keeping the parts declutched. The guide, Figs. 1, 2, 19, 20 and 21, is formed with an inclined track or groove 225, flanked by side walls 226, having lugs 227, with holes 228, adapted to receive rods 229, provided with clamping nuts 230, and secured to the webs of frame beams 34, by nuts 231.

A description ofthe operation of the machine follows; the direction of the discharge end being referred to as forward,

Ci Q

land the direction of lthe receiver vas backward:

Qpemtng mechanism No. 1.-Referring to Figs. 1 and 2, power is delivered to the wheel or pulley 78; and the eccentric shaft 74, and the eccentrics rotated; the direction of rotation being immaterial. In the positions shown, the eccentrics'are very nearly at the limits of their outward travel; detaching hook 87, engages bracket 89, but its springs 100, are compressed and just on the point of releasing the hook, through the reaction of the said springs on the cams 98, Fig. 13. Hook 88, and its bracket 90, are seen to be separated by a space which is somewhat in excess of the movement, or stroke, of the ore carrier; further rotation of the eccentric shaft will cause hook 87, to be depressed and released, and the ore carrier to be thrown back by the springs 111, cranks 112, and their attachments; the return movement being arrested, without shock, by the recoil mechanism 128, 129 and 130. The springs 111 and 128, are adjusted so that the ore carrier stops before bracket 90, reaches hook 88. The detaching hook 197, and bracket 200, Fig. 1, are seen to be in contact, and continue so during the return movement of the ore carrier; consequently, the hook 197, lever 198, tappet rod 212, and clutch shifter 221, Fig. 10, vibrate about the shaft 217; and the hanged head 213, of the tappet rod, arrives in the position shown in Fig. 19, at the end of the return stroke of the ore carrier; the release cam 214, however, is still approximately in the position shown in Fig. 1. The movement of clutch shifter 221, compresses spring 224, Figs. 1 and 2, and throws the clutch into contact; thereby'rotating gears 190 and 191, shaft 192, and crank pins 195; the latter operate the toggles, through conecting rods 178. During the first half revolution of the shaft 192, the cam 214, rotates, in a clockwise direction, through an angle of 180 degrees; the toggle pins 175, are moved back; and the blades 164 forced inward; thereby bringing, or tending to bring, pins 174, 175 and 176, and blades 164, into a straight line, with the cutting edges of the blades 164, separated by a space the amount of which is to be determined in operation; further rotation of the shaft 192, moves the toggle pins 175, forward, and blades 164, outward; and by the time the said shaft has rotated through an angle of about 340 degrees the cam 214, has reached the position shown in Fig. 19, and has engaged the flanged head 213, of the tappet rod; further rotation of about 20 degrees brings the tappet rod and cam to the position shown in Fig. 20. This motion of the tappet rod 212, rotates hook 197, about pin 199, through lug 209, thereby disengaging bracket 200. The reaction of clutch spring 224, disengages the clutch, and forces the clutch shifter 221, and lever 198, back to their starting positions, thereby breaking the contact between release cam 214, and head 213, Fig. 20; and permitting the latter to drop down on its track out of reach of the said cam. rThe cutters, cutter operating mechanism, and cutter releasing mechanism have now moved through a complete cycle, and have returned to the positions shown in Figs. 1 and 2, except that hook 197, and bracket 200, are disengaged; their contact faces being separated by a space equal to the travel or stroke of the ore carrier; the contact faces of hook 87, and bracket 89, are separated by a similar space; and the working faces of hook 88, and bracket 90, are in contact. Both eccentrics have commenced their return movement; and a rotation of the eccentric shaft of about 180 degrees brings the eccentrics to the limits of their inward travel; moves the ore carrier to the limit of its forward travel, or stroke; and compresses the release springs 100, sufficiently to break the contact between hook 88, and bracket 90.` The ore carrier is now thrown back by the. rapid return mechanism and stopped by the recoil mechanism, and the cutters and their attachments moved through another cycle in the manner previously described. The eccentrics are now commencing their outward travel with the hook 87, and bracket 89, in contact, and a rotation of the eccentric shaft of about 180 degrees brings all the operating parts into the positions shown in Figs. 1 and 2. During the operation described the cre carrier has made two slow forward movements, and two rapid return movements; the cutters land their attachments have operated through two complete cycles; and the eccentrics and their attachments through one complete cycle. Further operation is a repetition of that described. Springs 183, and their cperating attachments, are provided for the purpose of preventing injury to the cutters from excessive hardness of the sintered ore. Normally the reaction of the spring upon the cap 181, keeps the latter in contact with the retainingcollar 187, during the entire cutting operation, and only abnormal pressure on the ends of the cutter blades causes the spring to recoil.

l Operating mechanism No. Referring' to Figs. 11 and 12, power is delivered to the wheel or pulley 78, and the shaft 132, rotated in a clockwise direction. 1n the position shown, the return stroke of the ore carrier is just commencing; the parts 132 and 136, of the clutch shaft are enga-ged through sleeve 131, and clutch 135; crank 151, is traveling in a clockwise direction, rapidly moving the ore carrier through its return stroke; spring 147, is being compressed; and when, at the limit of the return travel of the ore carrier, the compression of the said spring 147 is at its maXimum, it throws sleeve 131, out of contact with clutch 135, and into contact with clutch 133. At this point the cutters operate in the manner described in connection with operating mecahnism No. 1. The pinion 134, now rotates clockwise with shaft 132, and being in mesh with gear 156, rotates shaft 157, anti-clockwise, moving the ore carrier very slowly forward, and compressing spring 146. At the limit of the forward travel of the ore carrier, the compression of the spring 146, is at its maximum, and it throws sleeve 131, out of contact with clutch 133, and into contact with clutch 135. One cycle has been completed and further operation is a repetition of that described. Springs 111, and cranks 112,. Figs. 1 and 2, and their attachments, may operate in conjunction with operating mechanism No. 2, to assist in returning the ore carrier; or the said springs, cranks, and operating attachments may be omitted.

Operating mechanism No. e3.Referring to Figs. 27 to 31, inclusive, power is delivered to the wheel or pulley 7 8; and shaft 232, and crank 241, rotated in the direction of the arrows, Fig. 29. Through the gears 234, 235 and 238, rotating in the directions indicated by the arrows, Fig. 29, shaft 239, and crank 244, are rotated. rlhe motions of cranks 241 and 244, are transmitted to rocker arm 251, through the links 243, and 246, and their operating attachments; and the motion of rocker arm 251, is transmitted to the ore carrier through rocker shaft 236, arm 253, connecting rods 259 and 263, and their operating attachments. In Fig. 26, the crank pin circles 263 and 269, are each divided into twelve equal arcs, representing respectively the positions of pins 242 and 245, during one cycle; and the intersecting arcs t to 7c, in the diagram above, indicate the corresponding positions of the crosshead pin 248. Let it be assumed that pin 242, is at a, on circle 268, when pin 245, is at a, on circle 269, and pin 248, is at a., in the diagram above; and that the pins 242 and 245 are rotating uniformly in the directions of the arrows, Fig. 26, covering the twelve spaces in twelve units of time. During the first unit of time pin 242, moves from a tol on circle 268; pin 245, moves from a to on circle 269;' and pin 248, from a to in the diagram above. During the second unit of time the said pins move from Z) to 0,' during the eleventh unit of time, the pins moves from 7a to Z; and during the twelfth unit of time from Z to a. It will thus be seen that the forward movement of crosshead pin 248, is completed in ten units of time, while its return movement is completed in` two units of time. The pin 248, is shown in Figs. 27, 28 and 29, in a position corresponding to a, Fig. 26; and the head 264, of rod 263, is shown separated from the head 260, of rod 259, by a space which it will be assumed for the purpose of illustration, is traveled by rod 263, in one unit of time; so that when pin 248, reaches b, Fig. 26, head 264, will be in contact with head 260, Fig. 27. During the first unit of time, while pin 248, advances from c to the ore carrier is therefore at rest, and it is during this interval that the cutters operate. The cutter operating mechanism, and mode of operation have been described in connection with operating mechanism No. 1, and the description neer. not be repeated here. During the following nine units of time, pin 248, moves from to 7c, Fig. 26, and the ore carrier completes its advance, or forward, stroke. During the eleventh unit of time, pin 248, moves from 7c to Z; spring 265, is being compressed, and the ore carrier is stationary. During the twelfth unit of time pin 248, moves from Z, to ct; spring 265, recoils; and the entire return stroke of the ore carrier is completed. The spring 265, is so designed and adjusted that the reaction at the endL of the return stroke will bring the heads 260 and 264, into the relative positions shown in Figs. 27 and 28. Fig. 26, represents a symmetrical or harmonic motion diagram; but it is evident that the motion may be made unsymmetrical by changing the length of crank 241, or 244, or of link 243, or 246; and that in fact an almost endless variety of motions may be produced by the mechanism illustrated, and without deviating from my invention.

Operation of fzLrmLcc.-liet it be assumed that the outlet 42, is connected, in the ordinary manner, to a flue leading to stack or chimney, which lis capable of creating a draft, or reduction of pressure, in the fume chamber 40; and that the discharge line from a fan, blower, or other source of air supply, is attached to the blower connection 47, or 51. To start the furnace when empty, wood or other kindling material is deposited in the bottom of the receiver and ignited; and the receiver is then filled with ore on top of the burning kindling. The ore carrier operating mechanism is then started, and the ore carrier set in motion through a cycle which, for the purpose of illustration, may be assumed to consist of a forward motion of four inches in about eighteen seconds, a return motion of four inches in about one second, and a pause of about l one second, during which the cutter operating mechanism acts; the machine thus operates at the rate of three cycles per minute, and the ore advances at the rate of one foot per minute. It is to be understood that the operating speeds, and the rate of advance of the ore above specified, are for the purpose of illustration only, and that I intend to adopt any operating speed, and any rate of advance, which the nature of the ore 'under treatment demands. During the slow for- .Ward movement of the ore carrier, the superincumbent ore is advanced with it in a compact mass; and during the rapid return of .the ore carrier, the ore mass, owing to its inertia, remains practically undisturbed at the point to which it had been advanced. The only disturbance of the ore particles is a slight compacting of the same, which, owing to its tendency to close up artificial channels in the ore mass, and to leave o-nly the natural voids between the ore particles for the passage of the ho-t gases of combustlon, may 'be considered to be highly beneiicial, since it prevents the hot gases from selecting paths of low resistance, and compels the said gases to pass practically uniformly through every part of the ore mass. The valves 46, on the igniter distributing pipes, are now opened, and the flame from the burning woodforced by the blast back into the slowly advancing ore. The direction of the blast, see Figs. 3, 15 and 18, is such that the bottom layer of ore will have the higher temperature; and the gases of combustion, following the path of least resistance, escape in front of the flange 24, into the fume chamber, and thence into the flue land stack. The receiver is kept filled with ore which may be supplied, either continuously or intermittently, in the manner commonly used for feeding ore, which usually includes some form of feed hopper. As the ore mass advances in the igniting chamber, the yflame generated in the burning ore is propagated back into the fresh ore entering the igniter, and the process of ignition thus maintained .automatically and without the .addition of fuel other th an that contained in the ore itself. The i-gnitedore, passing Vsuccessively the air passages 19 and 20., enters the combustion chamber, and as it arrives opposite each pair of air chambers the respective valves 46, are opened, ,and air for combustion admitted through the air passages 53,- (and 54,when the -machine is equipped with the' latter). As previously stated, the bottom layer of ore in the igniting chamber will have the higher temperature, and may 4be assumed to be red hot when entering the first section of the combustion chamber; here it encounters the -opposing currents of air issuing from the passages '53, on both sides, and the flame is propagated upward and brought into con- -Ltact with every particle of :ore in the furnace. Where the air passages 54, are provided in vthe walls of the combustion chamber .the process of sintering or roasting is accelerated, and -a greater volume of orecan ybe sintered per -unitof time in a. given size machine, than where `only the air passages 53, are provided. By the ltime the ladvancing .ore has arrived vopposite the cutters9 :the latter begin cuttlng the Slntered ore into cakes of nearly uniform size, which then discharge over vthe -lower edge of the ore carrier into 'the apparatus commonly employed for guiding the sintered ore into cars. The furnace is now filled with ore, in

various stages of sintering, to about the level ofl baffle plate 50; the ore level in the receiver is maintained approximately constant; and the ore carrier and cutters are adjusted, by means of the various adjustments illustrated, to operate in the desired manner. The air for combustion is preferably ,delivered at a uniform pressure; and is preheated to the desired temperature in its passage through the blower connection, header, distributing pipes and air chambers; and the valves 46, are regulated to deliver the desired quantity of air to their respective air chambers. The baffle plate 50, whenV used, is intended to reduce the quanti-ty of dust carried by the gases o-f combustion into the iue and stack. It is clear that with comparatively high blast pressure and a comparatively shallow bed of material having its top surface exposed land in which reactions favorable to the formation of dust are constantly taking place, considerable quantities of this dust might be carried by the waste gases into the flue system. To

prevent such formation of dust the baffle 50,

is made to cover the greater portion of the furnace, thereby limiting .the surface area at which the gases of combustion may escape, and confining the areas of exit to localities where the resultant higher velocities can produce no detrimental effect. A portion of the gases of combustion are permitted to escape aro-und the upper or back end of the plate, since the gases at this point do not carry dust in suspension; and the gases in 1 L the remaining portion of the furnace are compelled to pass through the ore to a point where the sintering process is complete, around lthe vlower end of the baffle plate, and into the fume chamber.

n the various types of sliding joints illustrated, the air passages 19 and 53, are so disposed with respect to the packings 55, 68 and 2170, that the force of the blast keeps dust, grit, and particles of ore, away from the said packing, and carries away heat from the metal parts in Contact with the said packing, thereby preventing overheating and excessive wear of the said packing.

The term ore, ,as used hereinbefore and hereinaftenis intended to include any line or coarse material in a condition adapting it to beroasted and sintered and containing, or having added, fuel elements 'in sufficient quantity to commence and carry to completion the sintering and roasting process. Such `ore may consist of ysulfids of copper, lead, or iron; or it may consist of a -mixture of sulfide and non-sulfids in such Yproportiene Suitcent Sulfur 0r other fuel components are present for the purpose specified; or it may consist of material having no inherent combustible elements, to which has been added other material containing combustible elements sufficient for I the purpose specified.

i am aware that prior to my invention machines have been made having for their object the sintering of ores by inducing or forcing air through a moving or stationary mass of ore, land l, therefore, do not claim such action broadly. All such machines, however, are dependent for their operation upon continuous external ignition of some portion of the ore under treatment, as, for instance, by means of oil, gas, or coal burners, all of which require fuel and attendance.

My invention includes a novel igniter arrangement by which ignition of the ore in the furnace is automatic, continuous, and entirely independent of external application of heat or fuel during the sintering and roasting process.

Having described my invention, l1 claim:

l. In a machine for sintering and roasting ore, 'the combination with a movably supported ore carrier comprising an impervious bed member with projecting joint members, of a fixed ore retainer comprising two oppositely disposed perforated side walls provided with depending iianges adapted to combine with the said joint members to form sliding joints, means attached to the said ore retainer for forcing a blast of air through the material under treatment. means for supporting the said ore carrier and ore retainer, and operating means attached to the said ore carrier adapted to produce a comparatively slow forward motion and a comparatively rapid return motion thereof, substantially as shown and described.

f2. ln a machine for sintering and roasting ore, the combination with a movably supported ore carrier comprising an impervious ore support provided with upwardly projecting joint members, of a fixed ore retainer comprising oppositely arranged perforated side walls provided with downwardly projecting flanges adapted to engage the said joint members -to form sliding joints, means for supporting the said ore carrier and ore retainer, and an operating mechanism attached to the said ore carrier and adapted to produce a variable reciprocating motion thereof, substantially as shown and described.

3. In a machine for sintering and roasting ore, in combination, a slidably supported ore carrier comprising an impervious ore support provided with longitudinal joint members, a rigidly supported ore retainer comprising two oppositely disposed perforated side walls having depending longv tudinal flanges arranged to form, in combination with the said joint members, longitudinal sliding joints, packing material arranged in the said sliding joints adapted to prevent leakage of air and ore therethrough, operating means attached to the said ore carrier adapted to produce a variable reciprocating motion thereof, a pair of oppositely disposed ore cutters slidably mounted inv guides secured to the machine and adapted to register with apertures in the said ore retainer, an actuating mechanism operatively connecting the said cutters with power transmitting means, a supplemental mechanism adapted to intermittently engage and disengage the said cutter actuating mechanism, and means for depositing ore on the said ore carrier, substantially as shown and described.

et. In a machine for sintering and roasting` ore, air conducting means comprising` a header adapted to receive air for combustion from an external source, air distributing pipes communicating with the said header and with air chambers situated in the sides of the machine, and means for regulating and controlling the flow of air in the said air conducting means, substantially as shown and described.

5. In a machine for sintering and roasting ore, an ore ignition chamber having rigidly supported perforated side walls with air chambers situated thereon and provided with depending longitudinal flanges,

a slidably supported impervious bottom member having projecting longitudinal flanges adapted to engage the flanges on the said side walls to form sliding joints, actuating means operativelv connected to the said bottom member and adapted to produce a variable reciprocating motion thereof, means for depositing ore on the said. bottom member, and means for supplying air to the saidV air chambers, substantially as shown and described. y

6. In a machine for sintering and roasting' ore, an ignition chambercomprising a slidably supported impervious ore carrier provided with operating means, a fixed ore retainer having its walls pierced to form a plurality of nozzle-like apertures and carrying on their exterior surfaces air chambers equipped with means for preventing leakage or air therefrom, air conduits provided with regulating Valves attached to the said air `chambers and adapted to receive air from a source of supply and to deliver the same under pressure into the said air chambers and thence in the form of ljets through the apertured ore retaining walls into the said ignition chamber, the said apertures being so constructed and directed that air for ignition is forced first through the burning ore and thence into the adjacent raw ore at a temperature suiicently high to ignite ithe ,1.,

latter Without the external application Vof heat or fuel, sliding joint structures arranged at the lines of juncture of the said ore carrier and ore retainer, means for delivering ore into the said ignition chamber` and means for collecting and discharging the Waste gases generated in the said ignition chamber, substantially as shown and described. Y

7. In a machine for sintering and roasting ore, an ignition chamber lhaving ore-retaining side Walls carrying on their exterior surfaces air chambers provided With means for receiving regulated quantities of air from an external source and adapted to preheat the same, the said side Walls being pierced to form a plurality of air discharges adapted to transfer jets of air under pressure from the said air chambers into the said ignition chamber, the said air discharges being soconst'ructed and directed that the air for ignition is forced first through the burning ore and thence into the adjacent raw ore a-t a temperature sufciently high to propagate the ignition automatically, continuously and Without the external application of heat or fuel, means for moving a continuous charge of ore through the said ignition chamber and past the said air discharges, means for preventing leakage of air and ore from the said ignition chamber, and means for collecting and discharging Waste gases therefrom, substantially as shovvn and described.

8. In a machine for sintering and roasting ore, an ignition furnace comprising 'a movably supported impervious ore carrier provided with operating means, a fixed ore retainer with perforated Walls and air chambers thereon, sliding joint structures arranged at the lines -of juncture of the said ore carrier and ore retainer, air conducting and air preheating means mounted on the said furnace and adapted to discharge air into the said air chambers and thence inthe form of jets through the -perforations in the said ore retaining Walls and into the said furnace, the said air jets being so directed that 'the air for combustion is forced firs-t through the burning ore and thence into vthe adjacent raw ore at a temperature sufliciently high tc ignite the latter Without the external application of heat or fuel, means for moving a continuous charge of ore through the furnace and past the said air delivering means in a manner to make the action o-f ignition automatic and continuous, and means for collecting and discharging the waste gases generated in the said furnace, substantially as shown and described.

9. In a. machine for sintering and roasting ore, a combustion chamber comprising a. slidably supported impervious ore carrier provided with operating means, a fixed ore retainer having its Walls pierced to form a plurality of nozzle-like apertures, each Wall carrying on its exterior surface a series of air chambers equipped with means for preventing leakage of air therefrom, air conduits provided with regulating valves attached to the said air chambers and adapted to receive air from a source of supply and to deliver Asame underv pressure into the said. air `chambers and thence in the form of jets through the apertured ore retaining Walls into vthe said combustion chamber, the said apertures being so constructed and directed that air lfor combustion is forced first through the burning ore at the bottom of the combustion chamber and thence into the ore above, sliding join-t structures arranged at the lines of juncture of the said ore carrier and ore retainer, means for delivering ore into the said combustion chamber, and means for collecting and discharging the gases of combustion generated therein, substantially as shown and described.

l0. In a machine for sintering and roasting ore, in combination, a furnace with a fume chamber xed thereto, air conducting and preheating means comprising a blower connection, a header communicating therewith, air chambers arranged on the side Walls of the said furnace, and air pipes provided with regulating valves leading from the said header to the said air chambers, means for mounting the said blower connection and header above the said furnace in contact With the Waste gases escaping therefrom, means for transferring air from the said air chambers to the said furnace, means for delivering ore practically continuously into the said furnace and vpast the said air transferring means, means for automatically propagating ignition andcombustion in the said furnace without external application of heat or fuel, and means for preventing leakage of air and ore from the said furnace, substantially as shown and described.

1l. In a machine for sintering and roasting ore, a fpair of rigidly supported apertured ore retaining members provided' on Vtheir exterior surfaces with a plurality of air chambers and arranged to form the side walls 4of a furnace comprising an ingnition chamber and a combustion chamber, a movably supported impervious ore carrying member operatively connected to an actuating mechanism and arranged to form the bottom of the said furnace, sliding joint structures arranged at the lines of juncture of the said ore retainer and ore carrier and adapted to prevent leakage of air and ore from the said furnace, means for delivering regulated quantities of air into the said air chambers and thence through the apertured ore retaining members into the said furnace, means for delivering ore into the said furnace, means arranged near the discharge end of the said furnace adapted to automatically out the slntered ore, and means for collecting and discharging the gases of combustion generated in the said furnace, substantially as shown and described.

12. In a machine for sintering and roasting ore, an ore retainer comprising oppositely disposed side walls constructed to form a furnace therebetween, air chambers formed on the said side walls and provided with means for preventing leakage of air therefrom, air inlets adapted to admit air into the said air chambers, a plurality of air outlets situated in the said side Walls and adapted to transfer air 'for combustion from the said air chambers to the said furnace, flanges projecting from the said side walls and constructed toform sliding surfaces .for air tight sliding joints, and means for supporting the said ore retainer, substantially as shown and described.

13. In a machine for sintering and roast# ing ore, a pair of oppositely disposed cutters slidably mounted in suitable guides and adapted to advance into the sintered ore and, after cutting the same, to return to their respective starting positions, and means for operating the said cutters at predetermined intervals, substantially as shown and described.

14. In a machine tor sintering and roasting ore, a pair oi' oppositely disposed cutters rigidly and detachably mounted in suitable holders and slidably mounted in' guides situated on the said machine, means operatively connecting the said cutter holders with an operating mechanism for forcing the said cutters into the sintered ore and 'for withdrawing the said cutters and returning them to their original positions, and shock absorbing means for protecting tne said cutters and cutter operating means from injury, substantially as shown and described.

15. In a machine for sintering and roasting ore, an ore retainer provided with an apertured cutter section, cutters slidably mounted in suitable guides and adapted to register with the apertures in the said cut ter section, means operatively connecting the said cutters with an operating mechanism adapted to advance and return the said cutters through the said apertures, and supplemental means for engaging and disengaging the said cutters and operating mechanism, substantially as shown and described.

16. In a machine for sintering and roasting ore, the combination with a slidably supported ore carrier, of an operating mechanism adapted to produce a comparatively slow advance movement of the said ore carrier and a comparatively rapid return movement of the same, substantially as shown and described.

17. In a machine :tor sintering and roasting ore, the combination with a movably supported ore carrier, of an operating mechanism adapted to start and stop the said ore carrier without shock and constructed to produce a comparatively slow forward movement vand a comparatively rapid return movement of the said ore carrier, and means for regulating` and varying the events in the cycle through which the said mechanism operates, substantiallyl as shown and described.

18. In a machine for sintering and roasting ore, the combination with a movably supported ore carrier, of an operating mechanism adapted to advance and return the said ore carrier, and supplemental means connected with the said operating mechanism Jfor intermittently operating an ore cutting device, substantially as shown and described.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

SOPHUS P. C. BORSON.

Witnesses U. M. BoRsoN, M. W. Mnanows.

Gopies of this patent may be obtained for five cents each, by addressing 'che Commissioner of Patents. Washington, D. C.

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