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Sept. 1-7, 1946. ‘J, c, SHANNON 2,407,851 MINERAL CLASSIFIER Filed Oct. 8, 1943 4 Sheets-Sheet 1 9mm min/may Elana/$3158]: ‘ y - Sept. 17, 1946. J_ c, SHANNON 2,407,851 MINERAL CLASSIFIER Filed Oct. 8, 1943 m \\ “ ‘ 4 Sheets-Sheet 2‘ Jaw/9x7 6.’ 5194/1/10” " By Ema/6M Sept. 1?, 1946. ' J_ c_ SHANNON 2,407,851 MINERAL CLASS IFIER Filed Oct. 8, 1945 > 4 Sheets-Sheet 3 A? c/osaw/f JMA/A/a/I/ B) ‘ WWW Im'entor Sept. 17, 1946. _,_ c. 'sHANgoN. ' ' 2,407,851 MINERAL CLAS S IFIER Filed Oct. 8, 1945 F75 B, ‘ 4 Sheets-Sheet 4 Patented Sept. 17, 1946 7 2,407,851 UNITED sTArEs'eArEN'r orrlcn Joseph 0. Shannon, Leadville, 0010. Application October 8, 1943, Serial No. 505,524 1 Claim. (Cl. 209—-384) 1 The present invention relates to new and use ful improvements in mineral classi?ers for use principally in the art of controlled grinding in the milling of friable ores. ‘ ‘ It is a matter of common knowledge that in the grinding of friable ores, such as zinc, lead, et cetera, there is a tendency to slime a large per centage of the ore. It is also well known that a certain percentage of such ores, as they are blasted in the mines, and crushed ores pre pared ‘for treatment, is ready for recovery with out the necessity of going through a grinding mill. The principal object of the present inven 2 ing the tooth frames on the'sluiceway or trough. Figure 8 is a top plan view, showing'the motor drive for the tooth frames. ' Referring now to the drawings in detail, it will be seen that the embodiment of the apparatus which has been illustrated comprises a sectional trough or sluiceway which is designated generally by reference character l. The trough l, which may comprise any desired number of sections, 10 is mounted at an inclination on a suitable sup porting structure 2. The trough 5 includes a bottom 3 and side walls 4, said bottom 3 having transverse slots 5 therein. ‘ tion is to provide, in a manner as hereinafter Depending from each section of the trough l set forth, an apparatus which may be installed. 15 is a hopper ii. The hoppers 6 communicate with ahead of the mill for recovering the ?ne ore the trough l for receiving the ?ne ores therefrom which does not need grinding, thus preventing over-grinding and sliming thereof. Another very important object of the inven tion is to provide, in a mineral classi?er com prising a substantially trough-like structure in cluding a bottom having openings therein for the passage of the ore to be recovered, novel means for positively preventing clogging of said openings. ' . Other objects of the invention are to provide a mineral classi?er of the character described which will be comparatively simple in construc through the slots 5. Outlet pipes l9 connect the hoppers 6 with suction pumps 20, said suction pumps being driven by electric motors 2!. It 20 will be observed that an outlet pipe IS, a suction pump 2i] and a motor 2! are provided for each of the hoppers t. The side walls 4 of the trough I extend down wardly below the bottom 3 of said trough in a ' manner to constitute the upper portions of the _ hoppers E. Substantially rectangular frames 8 are mounted for lateral reciprocation in upper portions of the hoppers 6 beneath the tion, strong, durable, highly e?icient and reliable tom 3 of the trough i. Supporting rods 9 in operation, compact, and which may be manu 30 H] project from the ends of the frames 3 factured and installed at low cost. All of the foregoing, and still further objects and advantages of the invention will become ap parent from a study of the following speci?cation, taken in connection with the accompanying drawings wherein like characters designate cor responding parts throughout the several views, and wherein: , the bot and and extend slidably through the lower portions of the walls 6;. Suitable packings H (see Fig. 7) prevent air from being drawn into the hoppers 6 around the rods 9 and E9. Upstanding teeth I2 of substantially the shape shown to advantage in Figure 6 of the drawings are mounted on the frames ii and project into the slots 5 for operation therein. In the embodiment shown, the teeth 92 Figure 1 is a View in side elevation of a mineral comprise depending lugs or pins [3 which are classi?er constructed in accordance with the pres 40 engaged. in openings provided therefor in the ent invention. frames 8. ' Figure 2 is a top plan view thereof. Brackets M are mounted on the side wall 4 Figure 3 is a cross-sectional view, taken sub through which the rods l8 project. Bell crank stantially on the line 3—3 of Figure 1 with the levers l5 are journaled for horizontal swinging electric motor and suction pump omitted. 45 movement on the brackets 54.‘ The bell crank Figure 4 is a, plan view of an intermediate levers l5 are pivotally connected, at one end, to portion of the apparatus, showing one of the the rods I0. Also mounted on this side wall 4 laterally reciprocating tooth frames. of the trough l are electric motors l6, one for Figure 5 is a fragmentary view in vertical 1on each section of said trough. Eccentrics I‘! are gitudina1 section, taken substantially on the line ' mounted on the vertical shafts of the electric 5-5 of Figure 2. . motors l6. The eccentrics I‘! actuate rods l8 Figure 6 is a detail view in side elevation of which are pivotally connected to the other end one of the teeth. portions of the bell crank levers I5. Figure 7 is a fragmentary view in vertical It is thought that the operation of the classi?er section, showing the method of slidably mount 55 will be readily apparent from a consideration of 2,407,851 3 the foregoing. Brie?y, the material to be treated ?ows downwardly in the trough I from the upper end thereof. As the material passes the slots 5 the ?ne ore is recovered therefrom, said ?ne ore being caused to pass downwardly through said 4 ?at bottom and side walls rising from said bot tom, said bottom having a plurality of parallel elongated transverse slots therein, a rigid rec tangular frame mounted forreciprocation trans versely of the trough parallel with and beneath slots into the hoppers 6 by gravity and suction. With the electric motors IS in operation, the teeth l2, which are constantly engaged in the slots 5, are reciprocated for positively preventing ‘a the bottom,‘ said frame embodying a plurality mineral classi?er constructed in accordance with slidably through the side Walls of the trough for mounting said frame beneath the bottom, hori of spaced parallel members, each alined with one of said slots, a plurality of spaced teeth rigid with said parallel members of the frame and project said slots from clogging at all times. 7 10 ing upwardly through said slots, spaced rods ?xed to each end of the frame, ‘said rods extending It is believed that the many advantages of a the present invention will be readily understood, and although a preferred embodiment of the de zontally swinging bell-crank levers mounted on ,_ vice is as illustrated and described, it is to be 15 one of the side walls and connected atcorrespond ing ends to the projecting ends of the adjacent understood that changes in the details of con rods, an electric motor -mounted on said .side struction and in thercombination and arrange ment of parts may be resorted to'which will fall wall, and a rod connecting the other ends of within the scope of the invention as claimed. said bell-crank levers and actuated by said motor 20 for oscillating the levers and thereby reciprocat What is claimed is: In a mineral classi?er of the character de ing the frame transversely of the trough. scribed, an inclined trough for reception of the material to be treated, said trough including a JOSEPH C. SHANNON.