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J. A. MUMFOR.
(Application flnd Apr. 18, 1901.1 (No Model.)
2 Sheets-Sheet 2.
eiwitten Patent' reifen...
.lOtiEldl A. hiUh'lFORl'), 0F ROSLYN, NEW YORK.
SPECEFGATEGN forming part of Letters Patent No. 696,580, dated April 1, 1902.
Application iiled April 16,1901. Serial No. 56,120. (No modela To LN Y1li/1.0711, 'IT/5 'ntftjf/ concern:
13e it known that i, Josnrn A. ltlntiroi-n), of Roslyn, in the county of Nassau, State of New York, have invented certain new and useful improvements in Sand-Driers; and I do hereby declare the following` to be` a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.
rlhis invention relates to improvements in driers designed, primarily, for drying sand, gravel, and the like, a`nd is of that type where in the material to be dried drops through the apparatus by gravity.
The objects ot' the invention are to provide a simple, compact, and highly efficient structure in which the heated gases, the., from the lire may be employed directly to dry the material uniformly' and with a minimum waste or escape of the heated or expanded air or gases without being charged with moisture from the sand or other material.
Referring to the accompanying drawings, Figure l 'is a vertical section through a drier embodying my presentI improvements. Fig. 2 is a section at right angles to Fig. l. Fig. 23 is a front elevation, and Fig. 4 isa detail side elevation, showing the operating mechanism for the feeder.
Like letters of reference in the several tigures indicate the same parts.
In constructing a drier in accordance with the present invention it is one of the objects to bring the heated gases from the furnace directly into contact with the sander material to be dried while the latter is in as finelysubdivided condition as possible and to prolong such contact as long as possible, whereby the moisture is taken up by the heated gases and the sand or material is allowed to escape in condition for use, and, further, te so arrange the structure that the destructihle parts will be protected against the injurious action of the heated gases and products of combustion, thereby materially prolonging the life of the structure and maintaining the same in operative condition.
Referring to the accompanying drawings, the letter A indicates a vertical stack or chamber having at a suitable point near its bote tom baffle or del'lecting plates B, preferably wedge-shaped, with the apex upwardly, so as to deflect material falling thereupon from one to the other, retarding its downward progress t to a certain extent and prolonging thc contact of the material with the air orga-ses within the chamber. At the bottom of the chamu ber a suitable exit openingvor passage for the escape of the material is formed, while at the top of said chamber is a feeding mechanism adapted to shower the material down. through the chamber in a subdivided condition, the feed taking place by gravity and the rateof feed being determined by the openings in or degree of agitation of the feeding mechanism, as will be presently described.
At one side of the chamber er stack A is a furnace C, which. may be supplied with fuel and the ashes withdrawn through suitable iire and ash-pit doors o, et' any usual or preferred construction. From the furnace C the gaseous products are carried upwardly alongside ofthe stach A to a point near the top of said stack or to a point immediately beneath the material-feeding mechanism, where said passage or flue D opens into the stack A, discharging the products and heated gases directly into the stack and through and into the material being showered down by the feeding mechanism, such products of combustion and heated gases being thence drawn downwardly, together with said material remaining in contact therewith, to a point below the baffle-plates B and being thence allowed to escape through asmoke or gas exit E, which may lead olf to Va suitable stack or other exhaust or draft creating means, which will insure a sufficient draft to maintain combustion in the furnace and a uniform steady downdraft through the stack A or through the stach in the direction lin which the sand or material to be dried travels.
In the operation of a drier as thus described it will be seen that inasmuch as the material is supplied in a wet condition the heated gases and products of combustion come in contact therewith when said material is in its wettest and coldest condition, the result heing that the maximum amount of moisture is quickly taken up by said gases and while the material is in free transit therethrough from the feeding mechanism to the bathe-plates and that by the retardation of the said ma- ICO terial in passing the baffle-plates both said material and the gases are brought toa uniform temperature, and in theory the said material may be discharged practically in condition ready for use, although in practice it is not necessary to establish such a perfect condition ot' operation. By allowing the material to come in contact'. with the battle-plates only after it has been subjected to the act-ion of the heated vgases said material is dried sut'- ficiently to prevent any possible clogging or adherence to said battle-plates, and as a result no agitation ot' the material in its passage over the bafle-plates is needed to keep the apparatus at all times clear and in working` condition'; but in case it is desired to clean said battle-plates or the chamber above the same, provision is made for opening the stack at the front side by means of doors F and G, although other well-known means for accomplishing this end may be employed.
The feeding machanism before referred to preferably consists of a series of rectangular or square bars H, suitably supported in bearings at cach side ol the stack A near its upper end and having operating-arms I connected with their ends outside of the stack, said operating-amis l being in turn jointed to an operating-rod K, extending oft to one Y side and adapted to receive reciprocatory motion, preferably from a crank-shaft L, through a link connection M, said shaft receiving its rotation by means of a pulley or drive-wheel N of an improved type. Obviously the bars ll may have their operating-arms I at one side or the other of the stack, and in practice itis preferred that alternate bars should have their operating-arms at opposite sides of the stack, as will be readily understood from an inspection ofFig. 3, so as to provide for suficient clearance when the arms are given a large radius of action.
The apparatus may be adapted for the handling of coarser or finer material, such material in every instance, however, being broken up and showered down through the stack A in the fine subdivided condition, so that every particle thereot` may be acted upon and its moisture taken oif by the heated gases which comeinto direct cont-act therewith. The cold Wet material lying on the bars H, together with the material being passed through said bars, will prevent the destructive action of the gases thereon, and by reason of the remoteness of the battle-plates from thc point of entrance of said gases said baffle-plates will be similarly preserved, whereby in practice the life and efiiciency of the structure will be materially prolonged.
Iii-operation the material is simply loaded on the bars H and the feedinginechanism set in operation, the escape of gases and products of combustion through thebars H being pre vented by the superimposed bulk of material to be fed through the stack. The accumulation of material at the bottom of the stack will prevent the escape of the gases and products of combustion through the opening for the discharge of the material, although, if desired, a suitable door or other closure may be provided at this point, but is not deemed necessary in ordinary operation.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is
l. A sand-drier embodying the following construction, to wit, a vertical stack, a furnace located near lthe base of the stack and having a [lue leading into the stack near the upper end, a discharge-line leading from the stack near the bottom, whereby the products oi combustion pass to the top of the stack and thence down through the stack to the exitopening, a showering mechanism for feeding sand into the stack above the furnace-flue, and balde-plates located above the dischargeflue and a suflicient distance below the furnace-flue opening to permit the sand to travel in the direction of and with the downwardlyw moving gases before striking the battle-plates, whereby the sand is dried sufficiently to prevent stoppage of the spaces between the plates, substantially as described.
2. A sand-drier embodying the following characteristics, to wit, a mechanism for showering sand, a vertical stack having a straight passage down through which said sand is showered in a free state, a furnace opening into the upper part of said passage, an exitopening from the lower part of the stack whereby the heated products are caused to travel in the same direction and with the sand while descending freely in the stack and bathe-plates for arresting the direct :iall ot' the sand; substantially as described.
JOSEPH A. MUM FORD.
CHAs. A. Fox, CIIAs. (i. RANnonrn.