322 MODERN GASWORKS PRACTICE
rollers or wearing Blocks are fitted at the bend to prevent the chains rising out of the trougli, the angle of the incline deciding whicli shall be used. The return path for the chains usually consists of steel angles with cast-iron renewable wearing Strips bolted on with countersunk headed bolts, supported éither under or over the trougli as is most convenient. The chain consists of best steel stamped block links (except where the cross-bars come, these being of cast steel, cast solid with. the cross-bars), alternating with double links, the block links being made specially high to take all
Fig. 236.—-Demfster’s Hot-Coke Conveyor.
the wear due to the rubbing on the wearing strips of the pan. The side links are connected in such a manner that the wear comes upon. the füll width of the portion passing through the hole in the block link and they are held together by livets, which are made easy of removal while being perfectly secure and forming no part of the wearing surface. The two chains are held apart by 2| inches by i-incli flat cast-steel bars cast solid with the block links at intervals of 2 feet 1J inches, for the transmission of the coke along the conveyor. The conveyor is driven by cast-iron wheels fitted with renewable manganese steel sprockets, and at eacli bend passes round cast-iron