US976175A - Ore-roasting furnace. - Google Patents

Description

Patented Nov.22, 1910.

2 SHEETS-SHEET 2.

J. B. F. HBRRESH'OPF.. OBE ROASTING PURNAGE. APPLIQIOATION FILED JULY 20, 1909.

ATTORNEYS l/WENTR 79.75%

:mw-mn JOHN B. F. HERRESHOFF, OF NEW YORK, N. Y., ASSIGNOR TO NICHOLS COPPER C0., OF NEW YORK, N. Y., A CORPORATION OF NEW-YORK.

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Specification of Letters Patent. Patented NOV. 22, 1910.

Application led July 20, 19Q9. Seria1-No. 508,598.

` To all 'whom it may concern:

Be it known vthat I, JOHN B. FRANCIS HERREsHorF, a citizen of the United States,

and resident of the borough of Manhattan, city, county, and State. of New York, have invented certain new and useful Improvements in Ore-Roasting Furnaces, of which the following is a specification.

My invention relates to furnaces for roasting fine ores and has for its object to improve the construction of a type disclosed in patents previously granted to me, particularly as to meansfor increasing the life and efficiency of the apparatus by proper cooling arrangements.

'A specific embodiment of my invention is illustrated in the accompanying drawings,

' in which- Figure 1 is a vertical section of an ore roastlng furnace containing my improvements; Fig. 2 is a vertical section drawn upon an enlarged scale showing one of the stirrer or rabble arms; Fig.l 3 is a horizontal section on line 3--3v of Fig. 2; Fig. 4 is a horizontal section on line 4;-4 of Fig. 2 and Figs. 5 and 6 are views taken substantially on lines 5 5 and 6-6 of Fig. 2.

The body or frame A of the furnace is provided ywith a series of superposed floors B-C, which are provided laterally with central openings B and peripheral openings C. The ore is delivered to the uppermost floor B through chutes D leading from cylindrical chambers E receiving a supply from hoppers F. .The ore is fed in the chambersE by means of screw conveyers G,

mounted upon a shaft G, which is driven by means of gearing G2. By means of rabble arms of a type now well-known in the art, the ore is crowded laterally' inward to the openings B and outward to the openings C 'and travels downward while the roasting driven by suitable mechanism such as the gearing H3. A gear J2 is connected with the upper portion of the sleeve J and serves through the medium of the gear G2 to op- 5. These erate the screw conveyers G. To the sleeve J are secured as by means of bolts and nuts K the rabble arms L. Each of these arms is preferably provided at its inner end with a flange L', fitted against a corresponding flange J3 of the sleeve J, and furthermore the rabble arm is divided internally by a partitlon L2 Into two channels, of which the upper channel L3 communicates with the interior of the sleeve J by means of an aperture J 4 while the lower channel L4 nicates withlthe interior of the shaft H by means of a nipple or tube M inserted into a suitable aperture of the shaftand extending therefrom outwardly through a suitable aperture of a sleeve to form a tight joint with the inner surface of the rabble arm. i

,Air is supplied by means of a blower or other suitable device through a pipe N connected with the lower end :of the shaft H and this air passes through the several nip? ples `M to the channels L* Iand L3, cooling the rabble arms and the shaft and finally escapes through the sleeve J and the stationary pipe O connected with the upper end thereof.

As shown in'the drawings,` the lowermost rabble arms Zneed not be provided with the air circulating means described above.

The projections B carried by the rabble arms are inclined alternately to the left and to the' right in adjacent arms so as to alter- 'nately force the ore inward and outward on the several oors in the well-known manner. I prefer to attach these rabble arms to movab e sections Q, each carryin three orv four `such projections and provide with suitable means for temporary attachment such as the overlappin hooks Q. shown in Figs. 3 and iooks lit over flanges Ls of the rabble arms and each section Q may therefore be slid lengthwise of the rabble arm, thus facilitating the insertion and remova'l of the sections carrying the projections I.v

Nuts and bolts, as indicated at R, or any other suitable means may be employed for preventing accidental movement o f the sec-. tions Q, during the normal o eration of the furnace. I have also indicate in Fi 1 pipe sections Sarranged at the center of t e oors C, which pipe sections are overlapped by 1nverted cups 'I shown also in Figs. 2 and 3. These parts of the furnace are provided ,for the passage of air through it at the begmning of the operation, 'but as soon as the ore` descends to the successive floors C, it rises above the level of the inverted cups T and: forms a seal therefor.

Iclaim as my invention:

1. An ore-roasting furnace comprising a casing with superposed floors, a hollow upright shaft in said casing, a sleeve surround- 'in said shaft and connected therewith, and

ra blearms held to rotate with said shaft and located entirely exteriorly thereof, said rabble arms being provided with interior channels communicatingwith the interior of the shaft and sleeve respectively.-

2.' In a furnace the combination of the casing, a hollow sha-ft therein, a sleeve connected with the shaft and a rabble arm held.

connected with the shaft and projecting l through the body atthe end opposite to the shaft, driving means connected with the projecting portion of the shaft driven mechanism connected with the .projecting portion of the sleeve for operating said feeding mechanism, and rabble arms provided with internal cooling channels connected at one end with the interior of the shaft and at the other end with the interior of the sleeve.

4. The combination of theA body or casing, the hollow shaft extending therein, the sleeve connected with the shaft and rabble arms mounted to turn with the shaft and located entirely eXteriorly thereof, said rabble arms being provided. with superposed channels; communicating with eachother at their outer ends, the. inner ends of said channels colnmunicating respectively with the interior of the shaft and with the interior of the sleeve.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

J. B. F. HERRESHOFF. Witnesses:

JOHN A. KEHIENBEGK, FRITZ ZIEGLER, Jr.

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