CLAY CRUSHERS.
Fig. 21 illustrates the No. i Two Roll Crusher built by the Frey-Sheckler Co., which is made for exceedingly stony clays. The frame is cast in one piece and the boxes have heavy rubber springs behind them. The rollers, 16 inches diameter and 24 inches long, are made of charcoal chilled iron with a 3-inch steel shaft through them. The steel scrap ers are placed on lugs with slots in them, so that they can be easily adjusted to the face of the roll as the edge wears of This is a very strong and durable crusher, and is a desirable substitute in places where other crushers failed, owing to weak ness in construction. This machine is provided with a patent friction clutch pulley. Diameter of driving pulley, 36 inches ; face of driving pulley, 10 inches ; speed, 20o revolutions per minute ; weight, 2,700 pounds.
Fig. 22 illustrates the Four Roller Crusher built by the Frey Sheckler Co., and which is made in two sizes, viz. : Nos. 7 and 8. This machine is very heavy, strong and durable, and designed for use in brick factories where large capacity is re quired.
The rolls are made of the best charcoal chilled iron, mounted on a frame of wrought iron 6 inches wide, i inches thick ; each pair of rolls is driven by independent belts. The driven rolls of each pair are provided with sliding journal boxes, which are backed up by heavy steel coil springs. By the use of the
sliding boxes, the rolls can be adjusted as may be desired.
In order to suit the great variety of material to be crushed, the Frey-Sheckler Co. manufacture three styles of rolls to be used for the upper pair. For very lumpy and stony clays, either the patent stone separating or conical rolls are used, and for clays of alluvial nature smooth-face rolls are employed. The rolls are keyed on the shaft and are perfectly balanced. The rolls are supplied with adjustable scrapers made of tool steel, which keep the rolls perfectly clean.
Number 7 Crusher has rolls 16 inches diameter, 24 inches long ; driving pulleys 36 inches diameter, io inch face. Speed of upper rolls, 250 revolutions per minute ; speed of lower rolls, 275 revolutions per minute ; weight, 5,800 pounds.
Number 8 Crusher is supplied with rolls 20 inches diameter, 26 inches long ; driving pulleys 36 inches diameter, io inch face. Speed of upper rolls, 300 revolutions per minute ; speed of lower rolls, 325 revolutions per minute ; weight, 9,400 pounds.
Both of these Crushers are now supplied with friction clutch pulleys, instead of plain pulleys, as shown in the cut.