US448408A - Sand and gravel heater - Google Patents

Description

(No Model.) Y Shee.l W-ff :et 1.

E. H. GALLAWAY.

SAND AND` GRAVBL HEATER. No. 448,408. Patented Mar. 1'7, 1891.

2 Sheens-Lneet 2.

Patented Mar. 1'7`, 18911.

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Tui nunme- Paens on., moro-urn rUNITED STATES PATENT Ormea.

EDWARD II. OALLAVAY, OF NEIV YORK, N. Y., ASSIGNOR OF ON EHALE TO GEO. W. SIIARER, OF PHILADELPHIA, PENNSYLVANIA.

SAND AND GRAVEL HEATER.

SPECIFICATION forming part of Letters Patent No. 448,408, dated March 17, 1891.

Application filed September 9, 1889. Serial No. 323,347. (No model.)

T ctZZ whom it may concern/f Be it known that I, EDWARD H. CALLAWAY, a'citizeu of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Sand and Gravel Heaters; and I do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to driers generally, and sand and gravel driers particularly.

The object of my invention is to Vprovide a simple and efficient machine for drying sand and gravel in a quick and thorough manner without requiring any manipulation of the sand or gravel while in the drier.

As is well known, wet sand or gravel is more or less cloggy, and in all the driers that I am aware of the sand or gravel must be kept moving by stirring or other motion by hand or by machinery, so that the person feeding the drier must devote more or less time to this object if done by hand, and if operated by machinery expensive power must be used to reach the desired result. In my device these objections are overcome by the particular arrangement of pipes1 which are so placed that the sand or gravel is kept moving by its own gravity and is broken or unclogged by falling upon the pipes below, which are hotter than those above.

The invention consists of constructions and combinations, all as will hereinafter be described iu the specification, and pointed out in the claims, reference being had to the accompanying drawings, in whichl Figure l represents a longitudinal section; 4o Fig. 2, a transverse partial section on line I l of Fig. I, the ends of the tlues being in t'ull lines; and Fig. 3, a longitudinal section of a modified formi A represents a furnace of any suitable construction and having a fuel-supplying opening A6 and a main flue A', leading to a vertical tlue or chamber A2, located at the opposite end of the machine. This vertical flue or chamber is constructed of any desired material, and, as shown, is made of brick and closed at the top and provided with au opening AT for the removal of soot. In the front wall ct are secured iiues a', which extend to a second vertical flue or chamber A3, located in the rear of furnace A and connected at its upper end to a chimney ALl of any suitable construction. The flues d are inclosed on the sides by the side walls A, which may be of wood or sheet metal. lVhen made of wood, thelower end of each side wall is provided 6o with metal sheet a2, which projects below the lower edge of the side walls to protect the lower ends thereof from the heat of the main iiue A. These side walls are inclined from the upper edges inward and downward toward the main flue A', so that all the sand will strike said flue before passing out of the drier. The side Walls are preferably supported by bars A6, to which they are secured in any suitable manner. The iiues d are arranged in 7o rows gradually decreasing in number, and in crosssectiou present substantially a wedgeshaped form, the flue A being the apex. The areas of these ilues combined are equal to the area of flue A', so that the products of com- 75 bustion will be equally distributed in passing from iiue A to the smaller lues.

rPhe vertical iiue or chamber A3, as before stated,is located immediately behind the furnace. It is also immediately above the front 8c end of flue A, from which it is separated Aby a thin partition, so that the product-s of combustion passing into the vertical tiue or chamber A3 will be more or less heated to increase the draft through the flues. By making the iiue 8 5 A inclined, as shown in Fig. l, better results are obtained, as the products of combustion passing through the iiues d are impinged against the inclined wall. If desired, however, thc iiue may be run straight from the 9o furnace, as shown in Fig. 2. In such cases I prefer to support. the center of the flue by means of pillar d4. This construction raises the flue A above the ground-line and gives a larger spacefor the sand to accumulate. In 9 5 the device shown in Fig. I the sand falls on each side of the flue A.

Vhen in operation, the sand or gravel is shoveled into the top of the drier and works its way downward between the flues, which roo are so arranged that aflue is placed imme.

diatelyY below.v the lspace between the flues above it. The space between the walls grad ually becomes less, so that the sand or gravel as it becomes dry reaches the hottest point. As the moisture causes the clogging of the sand or gravel, its removal causes the material to become granular, and by the time it reaches the flue A it has been thoroughly dried and escapes through the spaces a5 between the flue A and the side walls. The arrangement of the flues creates cross-currents in the flowing matter, so that the rubbing of the clogs or clods against each other wears away the dried part of the matter from that which is held together by the moisture unexpelled.

l. In a sand-drier, the combination of a furnace, a drying-chamber havinginclined-side walls, a vertical Hue or chamber A2 at the rear end of the drying-chamber, a flue connecting the furnace and said vertical flue and located between the lower ends of the side walls, a v

vertical iiue or chamber A3 at the rear of the furnace, and ues connecting the front and vertical llues or chambers and arranged in substantially a lwedge-shaped form between the inclined side walls.

2. In a sand-drier, the combination of a furnace, a drying-chamber having inclined side walls, a vertical flue or chamber A2` at the rear end ofthe drying-chambelgaliue connecting l the furnace and said vertical flue or chamber and located between the lower ends of the side walls, a vertical flue or chamber A3 at the rear end of the furnace immediately over the connecting flue, and fines connecting the front and vertical ues or chambers and arranged in substantially a wedge-shaped form between the inclined side walls.

3. In a sand-drier, the combination 'of a furnace, a drying-chamber having inclined side walls, a vertical Hue or chamber A2 at the rear end of the drying-chamber, a liuc having an inclined part in the rear of the furnace connecting the latter with the said vertical Hue and located between `the lower ends vof the side walls, a vertical flue A3. at therear .end

of the furnace and having an inclined bot` tom which serves as .the top of the inclined part of the main iiue, and iluescounecting the front and rear ues and arranged in sub-` stantially a wedge-shaped form between the.

inclined side walls.

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

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