US489142A - Ore-roasting furnace - Google Patents

Ore-roasting furnace Download PDF

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US489142A
US489142A US489142DA US489142A US 489142 A US489142 A US 489142A US 489142D A US489142D A US 489142DA US 489142 A US489142 A US 489142A
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carriages
roasting
ore
hearths
furnace
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor

Definitions

  • FIG. 1 is a longitudinal sectional view o'f my improved ore' roasting furnace, taken on line 2-2, of Fig. 2.
  • Fig. 2 is a horizontal sectional view on-the line :zz-r of Fig. 1.
  • Fig. 3 is a cross sectional view on the line -y-y Fig.l 1.
  • Fig. 4 is a similar view on the line z-z of Fig. 2.
  • Figs. 5, 6 and 7, illustrate detached -views of one of the carriages with its stirrers and adjunctive parts.
  • Fig. 8 is an enlarged ⁇ View. showing in plan Ione end of the track, one of the horizontally disposed pulleys, and two of the carriages.
  • Fig'. 9 is a side view of two of the carriages with their gripping'mechani'sms.
  • Fig. 10 isl an enlarged view of the gripping mechanism.
  • Fig. 11 is an end view of Fig. 10.
  • Fig. 12 is a longitudinal sectional vew of a double four-hearth furnace.
  • Fig. 13 is a. cross sectional viewoi the same on -the line w-w of Fig'. 12.
  • My'invention relates to that class of. furnaces, known as reverberatory furnaces for the roasting of ores containing preciouspmetals, and my invention consists of the ⁇ const'rnctions and combinations of parts, formingthe improved furnace, as I shall hereinafter iully describe and claim. ⁇ l l To enable others skilled in the art to which my invention appertains to makeand use the same, I will now describe its construction and l indicate the preferrec'i ⁇ manner in which the same is carried out.
  • each hearth Along the inner sides of each hearth are placed diaphragme orpartitions D' forming 55 side compartments similar to those shown, described and claimed in my formerPatent No. 471,264 granted tome March- 22 1892, and within these side compartments D2 Ds are laid track rails a a. both of which extend be- 6o youd the endstof the chambers or hearths, as
  • rPhe track rails a are to'be located within the outside-compartments D2 while the rails o. occupy .the inner compartments D8, the said rails a having theiroute r 165 extending en 'ds curved into semi -circular form, to form a continuous guide upon which the carriages to be hereiuaftenrnentioned may be transferred from the chamber ofonehearth to t-he chamber of the opposite hearth of the 7o same pair;
  • the rails a.' occupy the inner comr partments Ds of each pair of hearths and their extended ends are curved to form guides for the inner ends of the carriages, these guides being reverselyarranged as shown in Fig. 2 75 to properly guide the inn er'section or portion of the carriage as'the latter moves out of one compartment to the compartment .adjoining it on the side. 1
  • Each main chamber D has lts ends closed'by 8o suitabledoors or dampersq, the combinations and ⁇ operations of which are similar to those shownin my said former patent', and upon' a, suitable frame work V at the ends of .the furnace are the horizontally mounted pulleys E aroundwhich the endless chains'b-pass, the rims of said pulleys being concentric with an'd close to the curved'ends of the track rails a, as shown, and one set of pulleys being conf'- nected with gearing-c' or other well known 9o means fox-effecting the rotation of the pulleys and the consequent travel of the carriages through the fdrnace.
  • the partitions or'daphragms D which form the supplemental side compartments, extend from the door of the main hearths or com partrnents high enough to confine ,the ore upon the main hearths, and also to protect,
  • crdividingwall L,'bet ⁇ ween th'c compartments ⁇ of cach horizontal pair of ⁇ hcart'hs is made culaton of air for keeping the wall compara*v tiv'cl-ycool, and at the same time furnish free' F2 and -passlfng ont through'the fluejG to- ⁇ 4the upper hearth so as to convey the smoke and gases from the lower hearth to the upper hearth, independent of the open'ing tlnough which theore falls to thelou'erheairth.' Should 'the gases be taken upV throughthis connecting opening M between the-two hearths,'it..
  • the furnaces are preferably cont structcd with the series of hearthsron'e above the othersfthe orc being discharged through the openings M, to the hearths next below, and
  • the carriages are of peculiar form and are let into 'the' lengths-of the chains in suitable mechanical-and they each consist ,ot 4an 'angle barone arm C of 'which lies above and par-v allel with the track rail a while its )ther arm C.” extends transversely across -the roasting chamber and is provided with stirring blades orplates d.
  • l 'lhe carriages before stated are secured to the chains by means ot' a suitable clutch or grip, as for instance that ⁇ shown in Figs. S to il inclusive.
  • sist of a suitable frame work C* having 'a Avertical guide way e for a hat-f whose lower end is formed with a jaw g, shapedto'fit'within thelinksof thechains asshowni ⁇ nl ⁇ ig.10.
  • each carriage remains in the open aira shurent length of time to neutralize the edects .of the heat imparted to the arms and stirrers in passing through the fLirnace,'-and by constructing the furnace.witlrtwo or more. compartments one above the other, each roasting hearth can be made comparati vely short and the requisite number of square feet of roasting surface obtained by-duplication of the hearths, as shown in Figs. 12 and 13'wherein .is disclosed. an eight-compatment furnace.
  • An ore roasting furnace having a plurality of hearths placed side by side on the same horizontal plane, continuous track rails in said hearths with connected curved end portions, and carriages transferable on said track rails from one hearth to the other and pro-r vided wiih means for agitating and advancing the ore on the hearths.
  • An ore roasting furnace comprising roastingchambers arranged in pairs with the chambers of one pair placed side by side on the same horizontal plane, stirrers operating in said chambers, and means for transferring the stirrers from one chamber of each pairto the other chamber of the saine pair.
  • An ore roasting furnace having roasting chambers placed side bysideon the saine ⁇ horizontal plane, tracks in said chambers with horizontally disposed curved ends whereby a continuons track is formed from one chamber to another on the saine plane, and wheeled carriages adapted to travclon said tracksand to be ⁇ autouiaticall y transferred from one chamber lo another, said carriages being pro vided with means for stirring the ore.
  • An ore roasting furnace having roasting chambers placed side by side on the same horizontal plane, tracks within said chambers having curved ends whereby continuous tracksurfaces are formed between adjacent chambers, carriages adapted to travel on said tracks and provided with stirring devices, an endless "chain passing into one chamber in one directionand into the other chamber in an oppol site direction, and horizontally disposed pulleys forming guides for the chain.
  • An ore roasting furnace comprising roasting chambers side by side on the same horizontal plane, tracks along-thewalls ofsaid chambers, having onterends whereby a continuousV track surface is formed between contiguous chambers, horizontally disposed pulleys at the ends of the furnace, means for opl erating the pulley, an endless chain passing around said pulleys, and Vwheeled carriages connected with said chains and traversing the l chambers in oppositeirecfions,saidcarriages being provided with" ⁇ s'tirring devices, sub stantially as herjein described'.
  • An ore roasting furnace ' having a. roasting ⁇ hearth, achai'n passing through said hearth and stirringdeyices, in combination with fmeansactuate'd by the movement 'of the chain for clamping thestirring devices to the chain.
  • An ore'roasting' furnace having roasting hearths, chains pass'v 1g through the same, and carriages provided with stirring devices, in combination with fixed stops, and a gripping mechanism on said carriages actuated by ,conv ⁇ tact with said stops for automatically attaching said carriages to the chain, and releasing them therefrom, substantially as hereinlde scribed. lO. 'In an ore roasting furnace havingchains passing through it and provided with carriages having stirring devices, fixed stops in the path of thc carriages, and gripping mechanisms on said carriages comprising fixed jaws, and movable jaws automatically operated by contact with saidstops for clamping the carriages to the chains.
  • the means for advancing 'and stirring the ore comprising 4an angular bar-forming 'the arms() C provided with swi'veled wheeled frames, one of said' arms ⁇ movable in the supplemental chamber at one side ofthe furnace while the other arm -extends transversely -across the roasting hearth andhas its outer end supported in the supplementalV chamber at the yopposite-side, said transverse .arm being provided with vstirring devices, substantially as herein described.
  • An ore roastingfurnace havingvits main roasting chambers' ⁇ placed side by4 side andA provided with 'supplemental side compartments, the track rails inpsaid side compartments, connecting one roasting chamber' with 'riages are attached to or at their inner junction, said arms'C movable.
  • An ore roasting furnace having roasting hearths,lplnced side byside, endless chains passing through bot-h hearths and means for vSi operating the chains, in combination with the Wheeled carriagesprovided with stirring mechanism, the frames C4 of said carriages having astationary gripping jaw,'a gripping Jaw mov able in saidframe, aV pivotally secured plate having acam slot engaging the movable jaw, a ⁇ rod or lever' on thefaxis of the plate, and stops in the path of the carriages for tripping said rod or lever and releasing'or applying l the gripping mechanism wherebyiihe carreleascd from the loperating chains, substantially as herein-described. 4

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Description

4'Sheets-Sheet 1.
'Patented Jan. 3,1893.
[wl w 0 r.
H. P. BRQWN.
ORE RUASTING FURNAGE.
(No Model.)
No. mm/112,
4 Sheets- Shg't 2.
(No Model.)
H. E. BROWN. 03B RoAsTNG PURNAGB.
N0. www. Patented Jan, s, 189s.
lll/11111111 lill/Ill G2 @i www@ 4 Sheets-Sheet 3.
mme H. F. BRUWN.
ORE ROASTING FURNAGE. No. 489,142. Patented Jan. s, 189s.
(No Model.) H .F BROWN 4She ets-Sheet 4.
` URB ROASMNG EURNAGB.
NQ. 439,142, Patented Jn. s, 189s.
y UISHTED4 'STATES Prvr'leivr. OFFICE.
,HORCEFK BROWN, QFBUTTE, MONTANA,- ASSIGNOR TO MARY C. BRQWN, F
CHICAGQILLINOIS.'
ORE-no As-rmc FU Runes.
sPEcIFmA'rIoN forming part of Letters 'Patent No. 489,142, dates January s, isos.
Applies@ naa umh 31.1892. sum no. 427.225. (No sont) citizen of the United States, residing at Butte, l
in lthecounty of Silver Bow and State of Montana, have invented certain new and useful Improvements in Ore-Roasting Furnaces, as set forth in the accompanying drawings, forming part of this specificatiomin which- Figure l, is a longitudinal sectional view o'f my improved ore' roasting furnace, taken on line 2-2, of Fig. 2. Fig. 2, is a horizontal sectional view on-the line :zz-r of Fig. 1. Fig. 3, is a cross sectional view on the line -y-y Fig.l 1. Fig. 4, is a similar view on the line z-z of Fig. 2. Figs. 5, 6 and 7, illustrate detached -views of one of the carriages with its stirrers and adjunctive parts. Fig. 8, is an enlarged `View. showing in plan Ione end of the track, one of the horizontally disposed pulleys, and two of the carriages. Fig'. 9, is a side view of two of the carriages with their gripping'mechani'sms. Fig. 10, isl an enlarged view of the gripping mechanism. Fig. 11, is an end view of Fig. 10. Fig. 12, is a longitudinal sectional vew of a double four-hearth furnace. Fig. 13, is a. cross sectional viewoi the same on -the line w-w of Fig'. 12.
My'invention relates to that class of. furnaces, known as reverberatory furnaces for the roasting of ores containing preciouspmetals, and my invention consists of the`const'rnctions and combinations of parts, formingthe improved furnace, as I shall hereinafter iully describe and claim.` l l To enable others skilled in the art to which my invention appertains to makeand use the same, I will now describe its construction and l indicate the preferrec'i` manner in which the same is carried out.
` In the accom panyingdrawings Ihave shown the chambersor hea-rths D,arrangedin pairs one above the other with intervening arches, and with the chambers or hearthsofone pair communicating iwith those of tl1e pair immemediately below them by means ofthe openings M, whereby thc roasted ore may be transferred from the hearths of one pair .to the heart-hs of the pair next below them. By arranging the chambers or hearths vin pairs, each pair will be on the samehorizontal plane, and
,will be separated from eachv other by means f a hollowwall or partition L'having an air space'between its4 inner sides.- v
Along the inner sides of each hearth are placed diaphragme orpartitions D' forming 55 side compartments similar to those shown, described and claimed in my formerPatent No. 471,264 granted tome March- 22 1892, and within these side compartments D2 Ds are laid track rails a a. both of which extend be- 6o youd the endstof the chambers or hearths, as
shown in Fig. 2. rPhe track rails a are to'be located within the outside-compartments D2 while the rails o. occupy .the inner compartments D8, the said rails a having theiroute r 165 extending en 'ds curved into semi -circular form, to form a continuous guide upon which the carriages to be hereiuaftenrnentioned may be transferred from the chamber ofonehearth to t-he chamber of the opposite hearth of the 7o same pair; The rails a.' occupy the inner comr partments Ds of each pair of hearths and their extended ends are curved to form guides for the inner ends of the carriages, these guides being reverselyarranged as shown in Fig. 2 75 to properly guide the inn er'section or portion of the carriage as'the latter moves out of one compartment to the compartment .adjoining it on the side. 1
Each main chamber D has lts ends closed'by 8o suitabledoors or dampersq, the combinations and` operations of which are similar to those shownin my said former patent', and upon' a, suitable frame work V at the ends of .the furnace are the horizontally mounted pulleys E aroundwhich the endless chains'b-pass, the rims of said pulleys being concentric with an'd close to the curved'ends of the track rails a, as shown, and one set of pulleys being conf'- nected with gearing-c' or other well known 9o means fox-effecting the rotation of the pulleys and the consequent travel of the carriages through the fdrnace.
The partitions or'daphragms D which form the supplemental side compartments, extend from the door of the main hearths or com partrnents high enough to confine ,the ore upon the main hearths, and also to protect,
i'n a great measure, the track rails, chains or ropes, and the wheeled f rames of the carriages roo from the direct action-of the heat and fumes Within the main compartments. The central hollow or'with an airspace to insure a frcecii'-,
crdividingwall L,'bet`ween th'c compartments` of cach horizontal pair of `hcart'hs, is made culaton of air for keeping the wall compara*v tiv'cl-ycool, and at the same time furnish free' F2 and -passlfng ont through'the fluejG to- `4the upper hearth so as to convey the smoke and gases from the lower hearth to the upper hearth, independent of the open'ing tlnough which theore falls to thelou'erheairth.' Should 'the gases be taken upV throughthis connecting opening M between the-two hearths,'it..
would c'rcntesuch'astrong draft that a large amount. ofthelneore would rise in the form et' dust 'and cause considerable .loss by passing oil;` with the gases.' The flue F* from the upper tire box leads to the upper h earth as shown and the combined gases pass into the down [lue ll and enter at I intothe dust flue W to the flue X vwhich leads to the stack in any suitable manner. 'ily' this means the heat arising from the tirst health is utili-zedin burning the sulphur from theorcs in the hearthjs above, and in ease ot' ores carryinga high per-eentage of sulphur, theheat caused bythe burning oft' of -this sulphur would be suflicient to carry on and complete thefopei ation, by the constant addition f fresh ore,
without any additionalfuel, after the fur nace was `once thoroughly heated. To more thoroughly utilize theheat required for roast ing the orcs, the furnaces are preferably cont structcd with the series of hearthsron'e above the othersfthe orc being discharged through the openings M, to the hearths next below, and
. being niovedto alternate cndsuntil Afinally discharged from Vthe lower hearth in-any appropriate manner.
The carriages are of peculiar form and are let into 'the' lengths-of the chains in suitable manuel-and they each consist ,ot 4an 'angle barone arm C of 'which lies above and par-v allel with the track rail a while its )ther arm C." extends transversely across -the roasting chamber and is provided with stirring blades orplates d.
-To theouter ends of the arms C C oi the frames of the carriages, and also atI the augnlar junction ofsaid arms, are pivotallysecured frames or supports e in which Ywheels lor rollers C2 are mounted, whcreby'the wheels at the outer end of the 'a'rin C and also at the junction of said arm witlrthe arm C are adapted to travelnpon the rails a, while the wheels at the outer end of theotherarm C' are adapted to travel upon the rails a to steadyy and support said arm C. Front this description it` willhe seen that the ropeoreharn is actuated by means of the horizontal pulleys and are drawn through vthe compartments D?,
with the stirring blades. operatingl upon the mass of roasting'oye ou the hearth. fAs each carriage ,leaves tho heartht-he .forward point ofthe bar which forms the arms and-.0
commences to follow'the.curvature 0f the4 truck rail, while the other sideof said ba1"be gins t o fall back; the frameset the wheels-,Gi` turning about their pivots to allow thetlicfe,y movement of Ythe' carriage' in passingaro and t the curved portions ofthe 'trai-ks. After the f carriage has passed around the curved track portions its wheelsC? are directed into their respective cotnpartnients', and the carriage moves forward in the chamber at, one side of. the one it hadg'previously ieft.- Byt-his ar-" rangement I anrenabled tobuildnty furnaces Vwith `their, roasting hearths side by side, andY zontal pulleys withoutinterference therewith, ,j
l 'lhe carriages, before stated are secured to the chains by means ot' a suitable clutch or grip, as for instance that `shown in Figs. S to il inclusive. sist of a suitable frame work C* having 'a Avertical guide way e for a hat-f whose lower end is formed with a jaw g, shapedto'fit'within thelinksof thechains asshowni`nl `ig.10. 'lhc upper endv of'the barf Itas alateral stud` or projection h which extends `into a camshaped slot-Z formed in a, plato m pivotally 'mounted lupon the frame C", and upon the axiszof this plate iis a rod or le\'cr.l into contact with which suitable `xcd stops J2 are, adapted Vto come, whereby the rod J is tripped from the position shown antho right of Fig.
0 into thc'position shown at the left of s aidtigure. -lhismovenrentof the rod .l'ileauses the plate m to turn upon its axis, and thecant groove Z to force the bar f downward untlits jaw g is-forccd into one of the links ofthe Vchain and iutocoutact with a fixed jaw g formed on a part. of the frame Cithereby automatically locking the carriage to the chain.
These clutches argl-ips, cou-- IIO 'lhese features are essential in furnaces of this class for the-'reason that in all mechantcally stirred furnaces the plows or stirrers-bef come somewhat heated in .passing through the furnace, and itis necessary to carrytheends of the turnace outside of the. roasting hearths pass around before entering the next hearth.
-',lo obviatc. these difiiculties and atV the same time avoid the construction of housings, I einploy the construction and devices described.
In operation one or more of extra carriages .are .placed-upon the tracks as shown in lfig. i3 with the clutching devices open. These .carriages stand in this'A position until one of the working carriages comes along and pushes the idle carriage forward until the lever or driving mechanism shown, andthe carriages rrod J engages one ofthe stops J 2 when the 489,142 A "s Y clutching devices are operated to cause the movable jaw g to be forced tightly' against the moving chain Vand fixed jaw g whereby the carriage is locked to the chain andthe latter draws .the carriage 'through the furnace.
succeeding carriage meets it when lit is again locked to the chain in the manner before described. By .reason of these constructions.
each carriage remains in the open aira snieient length of time to neutralize the edects .of the heat imparted to the arms and stirrers in passing through the fLirnace,'-and by constructing the furnace.witlrtwo or more. compartments one above the other, each roasting hearth can be made comparati vely short and the requisite number of square feet of roasting surface obtained by-duplication of the hearths, as shown in Figs. 12 and 13'wherein .is disclosed. an eight-compatment furnace.
Also it is obvious that the shorter the construction of each hearth, the time intwhi'ch r the stirrers are exposed to the action of the heat between cooling periods, is very much lessened, and consequently a lnu'ch higher heat'can be carried in the furnaces without injury to the operating mechanisr Having thus described my invention'what I claim as new Patent, is:'-
l. An ore-roasting furnace h'avingroasting hearths placed side by side on the-same horizontal plane, stirrers opcratin g in'said liearths and ineansrfor transferring the stirrers from one hearth to another.
and desire to secure by Letters 2. An ore roasting furnace having a plurality of hearths placed side by side on the same horizontal plane, continuous track rails in said hearths with connected curved end portions, and carriages transferable on said track rails from one hearth to the other and pro-r vided wiih means for agitating and advancing the ore on the hearths.
3. An ore roasting furnace comprising roastingchambers arranged in pairs with the chambers of one pair placed side by side on the same horizontal plane, stirrers operating in said chambers, and means for transferring the stirrers from one chamber of each pairto the other chamber of the saine pair.
4. An ore roasting furnace having roasting chambers placed side bysideon the saine `horizontal plane, tracks in said chambers with horizontally disposed curved ends whereby a continuons track is formed from one chamber to another on the saine plane, and wheeled carriages adapted to travclon said tracksand to be` autouiaticall y transferred from one chamber lo another, said carriages being pro vided with means for stirring the ore.
5. An ore roasting furnace having roasting chambers placed side by side on the same horizontal plane, tracks within said chambers having curved ends whereby continuous tracksurfaces are formed between adjacent chambers, carriages adapted to travel on said tracks and provided with stirring devices, an endless "chain passing into one chamber in one directionand into the other chamber in an oppol site direction, and horizontally disposed pulleys forming guides for the chain.
`6. An ore roasting furnace having sepa,-V
rated roasting chambers placed side by side on the same horizontal plane, a hollow wall forming an air spacebetween said chambers tracks in said chambers having curved ends connecting the tracks of 'one chamber with those of the adjoiningone, carriages movable on said tracks and` provided with stirring devices, and means for operating the same, substantially as herein describe 7. An ore roasting furnace comprising roasting chambers side by side on the same horizontal plane, tracks along-thewalls ofsaid chambers, having onterends whereby a continuousV track surface is formed between contiguous chambers, horizontally disposed pulleys at the ends of the furnace, means for opl erating the pulley, an endless chain passing around said pulleys, and Vwheeled carriages connected with said chains and traversing the l chambers in oppositeirecfions,saidcarriages being provided with"`s'tirring devices, sub stantially as herjein described'.
8. An ore roasting furnace 'having a. roasting `hearth, achai'n passing through said hearth and stirringdeyices, in combination with fmeansactuate'd by the movement 'of the chain for clamping thestirring devices to the chain.
9. An ore'roasting' furnace having roasting hearths, chains pass'v 1g through the same, and carriages provided with stirring devices, in combination with fixed stops, anda gripping mechanism on said carriages actuated by ,conv` tact with said stops for automatically attaching said carriages to the chain, and releasing them therefrom, substantially as hereinlde scribed. lO. 'In an ore roasting furnace havingchains passing through it and provided with carriages having stirring devices, fixed stops in the path of thc carriages, and gripping mechanisms on said carriages comprising fixed jaws, and movable jaws automatically operated by contact with saidstops for clamping the carriages to the chains.
11. The combination with anore roasting furnace having roasting heart-hs with tracks surfaces therein and ends of the hearths, ot' carriages movable on said tracks and provided with fixed movable gripping jaws and stirring devices, movable chains to which the carriages are clamped,
and stops in the path of the carriages for tripping` the movable gripping jaws and releas- IOD ingthe carriagesfrom the chains at intervals, substantially as and for the purpose herein described. p A
l2. In any ore roasting furnace, the combinai tion with roasting hearths, the endiess chains passing through both hearths and means for actuating the chains, of avseries of carriages provided with' stirring devices, fixed stops in the path of the carriages, and gripping jaws on said carriages automatically operated by4 contact with said stops for releasing the car= riages from the Vchains at intervals, substantially as and for the purpose herein described'.
13. In an ore roasting furnace the main roasting chambersvpiaced side by side and having supplemental chambers at-the sides provided with track rails having curved outer ends, the means for advancing 'and stirring the ore comprising 4an angular bar-forming 'the arms() C provided with swi'veled wheeled frames, one of said' arms `movable in the supplemental chamber at one side ofthe furnace while the other arm -extends transversely -across the roasting hearth andhas its outer end supported in the supplementalV chamber at the yopposite-side, said transverse .arm being provided with vstirring devices, substantially as herein described.
14,.` An ore roastingfurnace havingvits main roasting chambers'` placed side by4 side andA provided with 'supplemental side compartments, the track rails inpsaid side compartments, connecting one roasting chamber' with 'riages are attached to or at their inner junction, said arms'C movable.
within one of the side compartments while the arms C extend transversely across the 4roasting hearth with their outer end supported in the opposite sid'e compartment, and provided with stirring devices, substantially as herein described. l
15. An ore roasting furnace having roasting hearths,lplnced side byside, endless chains passing through bot-h hearths and means for vSi operating the chains, in combination with the Wheeled carriagesprovided with stirring mechanism, the frames C4 of said carriages having astationary gripping jaw,'a gripping Jaw mov able in saidframe, aV pivotally secured plate having acam slot engaging the movable jaw, a` rod or lever' on thefaxis of the plate, and stops in the path of the carriages for tripping said rod or lever and releasing'or applying l the gripping mechanism wherebyiihe carreleascd from the loperating chains, substantially as herein-described. 4
- HORACE F. BROWN. Witnessesz` Gno. K. FISCHER, I. M. WALKPR.
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