THE MECHANICAL HANDLING OF MATERIALS 821
upon. The chains are protected by steel angles or tees bolted to the trough sides with special countersunk headed bolts. The sides of the trough are protected by |-mch steel renewable plates which are bolted on with countersunk headed bolts. These plates also hold the cäst-iron bottom plates in position. In some cases the trough in the retort house is covered over with hinged doors of J-inch or f-inch steel chequered plate, level with the floor, the doors on the retort bench side being used to deflect the coke from the retorts into the trough. After leaving the retort house
Fig. 235.— Wbst’s Hot-Coke Conveyok.
the conveyors usually rise at an angle, varying with the space available, to a suitable height for delivering the coke into hoppers, etc. In these cases the trough up the slope is made about 2 feet deep by means of |-inch steel side plates and is covered by -^--inch steel plates bolted on the top, thus conrpletely enclosing the trough and carrying the steam from quenching to a steel chimney near the top of the incline. By this means the steam is kept in contact with the coke for a considerable time and ensures the coke being properly quenclied. The quenching sprays are fixed to the top plate over the trough near the bottom of the slope, the surplus water draining out through, a grid fixed to the trough side on the level portion near the bend. Guide