Dec. 16, 1930. T. J. TELLEFSEN 1,785,604 MEANS FOR ELEWATING PULVERULENT MATERIALS Filed March 9 1928 2. Sheets-Sheet l Dec. 16, 1930. Patented Dec. 16, 1930 1,785,604 UNITED STATES PATENT OFFICE THEODORE. J. TELLERSEN, OF CINCN NATI, OHIO, AssIGNOR TO THE J. H. DAY co PANY, OF CINCINNATI, OHIO, A CoRPORATION OF oHIO MEANS FOR ELEVATING PULVERULENT MATERIALs Application aled arch 9, 1988. Serial No. 280,438. This invention relates to screw type ele are mounted in bearings 21 and 22 provided on vators for conveying finely divided materials the lower casing 16 and discharge casing 19, such as flour, powders, and the like. respectively. As shown in Fig.2 the tubular An object of the invention is to provide a members 9 and 11 are positionedin offset rela- . is screw type elevator which will elevate pull tion to tubular member 10. verulent materials in an effective manner. Suitably supported upon the member 10 Another object is to provide a device of is a board 23 which carries a motor 24 and this type which is so constructed that the a pair of bearings 25. Motor 24 is provided flour or powdered material being elevated is on its drive shaft with a gear 26 which meshes o precluded from objectionable packing about with a large gear 27 mounted on a shaft 28 the lifting and conveyor screws. rotatably supported in bearings 25. On one Another object is to provide a device for end of the shaft 28 is fixedly mounted a the purposes stated which is simple of con sprocket 29 over which a chain 30 passes for struction and operation. driving a sprocket 31 fixedly secured on shaft 15 These and other objects are attained by 15 of screw 5. On the opposite end of shaft the means described herein and disclosed in 28 is fixedly secured asprocket 32 which the accompanying drawings, in which: drives a sprocket 33 on the shaft of lead screw Fig. 1 is a side elevational view of the de by means of a second chain 34. The shaft vice parts being broken away. of screw 7 is also provided with a bevel gear 20 Fig. 2 is a cross sectional view online 2-2 35, keyed or otherwise fixedly mounted there O of Fig. 1. on. Said bevel gear is adapted to engage a Fig. 3 is a view showing means whereby the second bevel gear 36 mounted on a shaft 37 material being elevated or conveyed may be which is suitably journaled in a bearing 38 projected to elevations exceeding that indi extending from the discharge casing 19. The 25 cated in Fig. 1. opposite end of shaft 37 has fixedly mounted s . In screw type elevating devices heretofore thereon a spur gear 39 which engages a spur used for conveying and elevating substances gear 40 fixedly mounted on the shaft of ele and materials such as flour and powders, etc. vating screw 6. The means just described im it has been found that after the material has parts rotatory motion to the elevating screw 6 30 been elevated to a certain height, packing of and leadscrew 7. It should be noted that the 80 the material about the elevating screw takes gears and sprockets are of such size as to drive place, thereby precluding further upward the screw 7 at a speed greater than that of the projection of the material. By utilizing the elevating screw 6. The reason, for thus gear means illustrated in the drawing and de ing the said screws will be described later. 35 scribed in the specification following, such By providing sprockets 29 and 31 of a packing of the material is precluded. Other proper size, the feed screw 5 may be driven advantages also will be made apparent in the at a greater speed than the elevating screw. description. Screw 5 has one end thereof extending into The device comprises spiral screws 5, 6, 7, a hopper 41 into which material may be fed and 8 rotatably supported in tubular hous during the operation of the device. It should ings 9, 10, 11 and 12, respectively. Screws 6 be noted that the offset relationship of screws and 8 may be termed elevating screws, and 5 and 7 to the elevating screw 6 is such that screws 5, and 7, lead or feed screws. Feed the lead screws rotate in close proximity with screw. 5 is provided with a shaft 13 suitably the blade of the elevating screw. If desired, 45 journaled in bearings 14 and 15 of a hopper the tubular member 11 shown in Fig.1 may 41 and lower casing 16, respectively. Feed terminate at a bin or other suitable container, or lead screw is likewise mounted in a bear not shown. ing 18 in a discharge casing 19 at the upper In Fig. 3 the tubular member 11 is exempli end of the elevating screw. Elevating screw fied as terminating in an angular housing 42 60 6 is provided with a shaft20 the ends of which provided with means whereby a tubular mem 2 1785,604. ber 12, supporting elevating screw 8, may be It is to be understood that various modifi placed in offset relation with screw 7. This cations may be made in the structural details construction is similar to that shown at the of the device without departing from the upper end of the device disclosed in Fig. 2. spirit of the invention. Means is provided for imparting rotatory What is claimed is: To 5 motion to shaft 43 of screw 8. Said means 1. In an elevating device for powdered sub comprises a spur gear 44 fixedly secured upon stances the combination of an upright hous the lower end of shaft 43, said gear being ing having upper and lower ports, an elevat driven by a gear 45 E; rotatory motion ing screw rotatable in the upright housing through the agency of a shaft 46 and a pair of and extending beyond said ports, a tubular () co-operating bevel gears 47 and 48. Bevel second screw housing having a port in com gear 47 is fixedly mounted on the shaft of the munication with the lower port of the first driven screw 7. The ratio of gears 44 and 45 housing, a feed screw in the second housing is such as to drive the elevating screw 8 at for feeding powdered substance to the lower a speed slower than that of screw 7. The portion of the elevating screw, the screwsbe 80 means just described provide for rotation of E. disposed transversely of one another in the elevating screw 8 whereby substance be different planes with their peripheries in ing conveyed may be elevated to a height con close proximity. siderably greater than may be attained by a 2. In an elevating device for powdered sub continuous screw 6. It has been found that stances the combination of an uprighthousing 85 . a single elevating screw is capable of elevat having upper and lower ports, an elevating ing substance such as flour or powdered ma screwrotatable in the uprighthousing and ex terial to a certain height. When it is at tending beyond said ports, a tubular second tempted to elevate a substance beyond this screw housing having a port in communica point, the substance becomes packed about the tion with the lower port of the first housing, a 90 25 elevating screw with the result that the sub feed screw of E. capacity than the elevat stance rotates with the screw and is not ing screw rotatable in the second housing for ejected at the top of the screw housing. feeding powdered substance to the lower por The operation of the device is as follows. tion of the elevating screw, the screws bein It is assumed that the screws are of equal disposed transversely of one another in dif 95 pitch and diameter. Flour or other substance ferent planes with their peripheries in close is fed to the hopper 41 after the device is set proximity. in operation. Lead screw 5, rotating at a 3. In a device of the class described the comparatively high rate of speed, conveys the combination of an upright housing having substance to the lower end of elevating screw upper and lower ports, an elevating screwro 00 35 6 in quantities in excess of the normal carry tatable in the upright housing and extendin ing capacity of the elevating screw. The sub beyond said ports, a casing at the lower ES stance thus fed to the elevating screw 6 is of the elevating screw housing into which the easily picked up by the elevating screw and lower extending portion of the elevatin O elevated to the uppermost point thereof, screw is received, a tubular housing dispose (S whence it is quickly removed by the compara angularly to the upright housing and having tively high speed screw 7 and deposited in communication with the said casing, a closely housing 42 at a rate in excess of the normal fitting lead screw in the second housing, said carrying capacity of elevating screw 8. lead screw extending beyond the housing, 45 Screw 8, rotating at a speed slower than that with the periphery thereof closely adjacent 0 of screw 7 thereupon picks up the substance the periphery of the elevating screw, and from housing 42 and elevates it to a greater means for rotating the screws at different height. It is obvious that by providing ad speeds. ditional lead screws 7 and elevating screws 8, 4.