US664153A - Ore-roasting furnace. - Google Patents

Description

No. 664,l53. Patented Dec. I8, |900. F. W. HULTMAN.

ORE RUASTING FURNACE.

(Application Xed Aug. 20, 1900.) (No Modal.) 2 Shania-Sheet l.

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I I Y 'Adolf/ley No. s64,|53. i Patented nec. la, |900. F. w. HoLTMAN.

'URE RUSTING FURNACE.

(Application led. Aug. 20, 1900.)

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FREDERICK W. HOLTMAN, 0F RICHMOND, VIRGINIA.

GRE-ROASTING FU RNACE.

SPECIFICATION forming` part of Letters Patent No. 664,153, dated December 18, 1900.

Application filed August 20,1900. Serial No. 27,458. (No model.)

.To all whom it may concern:

Be it known that I, FREDERICK W. HoL'r- MAN, a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Improvements in Ore-Roasting Furnaces; and I do declare the following to be afullf, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon,which form apart of this specification.

This invention relates to new and useful improvements in ore-roasting furnaces, and especially to furnaces in which reciprocating rake-teeth are utilized to stir and feed the ore from one bed to another, said teeth being operated by means of threaded shafts mounted outside the furnace-walls and on which shafts interiorly-threaded nuts are mounted to travel, which nuts are fastened to the racks carrying the teeth, whereby the teeth may be reciprocated backward and forward upon the beds.

My invention will be hereinafter more fully described and then specifically defined in the appended claims, and is illustrated in the accompanying drawings, which, with the letters of reference marked thereon, form a part of y this application, and in which drawings similar letters of reference indicate like parts throughout the several views, in which- Figure lis a side elevation of an ore-roasting furnace, showing the slot-covering plates projecting beyond the end of the furnace. Fig. 2 is an end elevation of the furnace, a portion of the wall being broken away to better illustrate a section of one of the rake-carrying racks and a portion of one of the beds. Fig. 3 is a top plan view of one of the racks which carries the rake-teeth, said view showing the sleeves for holding the ends of the racks and the threaded shafts and interiorlythreaded nuts which travel on said threaded shafts. Fig. 4 is a bottom plan view of the rack, showing the triangular-outlined teeth carried thereby.

Reference now being had to the details of the drawings by letter, A designates the wall of the furnace, made, preferably, of heavy iron plate or castings filled in with {ire-brick,

as is the common construction of furnaces of this character. Within the furnace are parallel beds B of tiling, which extend from one side wall to the other across the furnace. These beds are disposed parallel with one another, there being four shown in the drawings, Fig. 2. These beds have the alternatelyarranged outlet-apertures near the ends of the beds, which are common in furnaces of this character and through which the ore is allowed to fall by gravity from one bed to another by means of the rake-teeth as they are reciprocated back and forth on the upper surfaces of the beds.

The feeding-hopper C is mounted on one end of the furnace and communicates with the space above the upper of said beds B, and the regulation of the feeding of the ore is done by means of a rotary drum C', which is common in the art. Therefore a detailed description of its construction and operation, it is thought, is not necessary. Suffice it to say that the drum is operated by belted connection D with a pulley E, which is mounted upon and driven by the shaft F, which latter is operated from any source of power.

The sides of the furnace are slotted, as shown at G, each slot being a slight distance above a bed B and extending the length of the interior measurement of the furnace. These slots are in the opposite longitudinal walls of the furnace, and sleeves H, Figs. 2 and 3, work backward and forward in these slots. To the inner ends of said sleevesY are held the ends of the racks J, to which are fastened the rake-teeth I, which are preferably triangular-shaped in cross-section. To the outer ends of said sleeves are bolted or otherwise fastened the interiorly-threaded nuts K, which embrace the threads of the shaft L and travel thereon. Said shafts L, which are eX- teriorly threaded., are mounted in suitable bearings on the outside of the furnace, and each shaft L is parallel with said slots and adjacent thereto. Bevel gear wheels M are keyed to the forward ends of the shafts L and mesh with bevel gear-wheels N, which are mounted upon and rotate with the vertical shafts O, one on either side of the furnace outside the wall thereof. At the lower ends of said vertical shafts O are the bevel gear- IOO wheels O', which mesh with gear-wheels P, that are keyed to the horizontal shaft F.- This shaft F may be driven from any source of supply whereby a certain number of revolutions may be imparted to said shaft and then the shaft made to rotate in the opposite direction for the purpose of reciprocating the racks carrying the rake-teeth through the geared connections described. As no novelty is claimed for the reversing mechanism in connection with shaft F, said mechanism is not illustrated.

Connected to each sleeve H, on opposite edges thereof, are the slot-covering plates R, which plates are shown in Fig. 1 as projecting beyond the end wall of the furnace, which are the positions that said plates would assume when the racks carrying the rake-teeth are at the forward end of the furnace. When the rakes are at their farthest backward throw, the plates, which are secured to the opposite edges of the sleeves, would project correspondingly beyond the rear wall of the furnace. By the provision of these plates it will be observed that the slots are kept closed while the sleeves carrying the racks with the rake-teeth reciprocate backward and forward in said slots.

By the provision of the split nuts,whicl1 are interiorly threaded, the nuts may be easily removed and adjusted, and by having the ends of the racks J seated in the inner ends of the sleeves H the racks are allowed to eX- pand and contract freely.

The operation of the rakes is similar to the reciprocating movements of rakes in this type of furnace, the ore being rst turned by means of the angled surfaces of the teeth and then pushed forward by the flat faces of the teeth, which flat faces are presented at right angles to the slotted walls of the furnace in a manner as is shown in the construction of the well-known Spence patent, No. 248,521, of October 18, 1881.

By means of the threaded shafts on which the interiorly-threaded nuts travel the racks are reciprocated backward and forward, the rake-teeth feeding the ore from one bed to another, as will be readily understood.

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

1. An ore-roasting furnace, having a vertical series of beds therein, the walls of said furnace being slotted horizontally adjacent to the upper surfaces of said beds, sleeves and rack-bars supported thereby, rake-teeth carried by said bars, interiorly-threaded nuts having integral shank portions which are connectod to said sleeves, and designed to travel in said slots, worm-shafts working through said nuts, shutters fastened to the opposite edges of the shank portions of the nuts vand designed to close said slots and slide against the outer walls of the furnace, as the racks are reciprocated over the beds and means for rotating the worm-shaft, as set forth.

2. In combination in an ore-roasting furnace, the beds, the racks having rake-teeth s eoured thereto, the sleeves having recessed ends designed to receive the ends of said racks, the outer ends of said sleeves being contracted with inclined edges, theinteriorlythreaded nuts having integral shank portions which are fastened to the contracted ends of the sleeves, the threaded shafts'working through said nuts, and means for operating said shafts, as set forth.

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

FREDERICK W. HOLTMAN.

Vitnesses:

T. H. WEIMER, W. H. CHILDRESS.

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