EXAMPLES OF STEEL COAL TIPPLES. 



Operation of Coal Tipple. Detail plans of the shaking screens and tipple equipment are 

 >h..u 11 in Fig. 12. The coal is raised from the mine in self dumping cages and is dumped into two 

 \v-ii;li hoppers having a capacity of four tons each. From the weigh hoppers the coal passes 

 through a dump chute, and may be run directly into cars on the track or may be run over shaking 

 M-riviis. The first section of the shaking screens is 29 ft. 9 in. long, the top deck, having a length 

 of 16 ft., has f in. round perforations; the middle, having a length of 18 ft., has 2 in. round perfora- 

 tiim>, the l>ottom plate being solid. The upper deck of screens sloping toward the head frame 

 has perforations 3J in. to 2 in. round; the second deck has perforations 2j in. to 3 in. round; the 

 third plate deck has perforations f in. round, the bottom deck being solid. The coal passing 

 over the 2 in. and 3J in. round perforations of the main screen may be run back over the shaking 

 screens just described, or may be run over the second shaking screen 27 ft. 4 in. long and 8 ft. widf. 

 This shaking screen has a length of 8 ft. with perforations 6 in. in diameter. By making different 

 combinations of the screens different grades of coal can be obtained, as is shown in Fig. 12. The 

 shaking screens are carried on rollers 12 in. in diameter, which are operated by eccentric connecting 

 rods with a 12 in. stroke. These rollers give the shaking screens a motion in two directions and 

 give much more satisfactory results than the earlier method of suspending the shaking screens 

 from overhead supports. .The capacity of the tipple is 2,500 tons in eight hours. 



The tipple was designed and constructed by the Wisconsin Bridge & Iron Company, and 

 the tipple equipment was furnished by the Link-Belt Company. 



Steel Coal Tipple at Spring Valley Shaft No. 5. The steel coal tipple constructed at Spring 

 \ alley shaft No. 5, Spring Valley, Illinois, is one of the best examples of steel tipple construction 

 for bituminous mines. The stSel tipple building is 187 ft. long, 36 ft. wide and 35 ft. from the 

 track level to the level part of the main tipple floor. The steel head frame is 75 ft. and 85 ft. 

 6 in. from the track level to the centers of the sheaves, respectively. The sheaves are 10 ft. in 



{1-4*3. 



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5iD ELEVQTION. FMNT ELEVATION. 



FIG. 14. STEEL HEAD FRAME, SPRING VALLEY COAL TIPPLE, SHAFT No. 5. 



