The Mechanical Handling and Storing of Material

io8 THE MECHANICAL HANDLING OF MATERIAL built by the Berlin Anhaitische Maschinenbau Aktien Gesellschaft. This differs in prin- ciple from the former in so far that the front end of the pan is raised for tipping, instead of the back end being lowered. This design has the advantage that a movable discharge carriage can be used, which facilitates the discharge at all points, whereas the conveyors previously described could only deliver at a number of predetermined points. Each pan or segment of the trough is fitted with one pair of running rollers at the back end, the fore part resting on a flat iron bar riveted to the links of the chain. There are also two small rollers, one on each side of the fore part of the pan, and these engage with the rails of the tipping gear, and so empty each segment as it passes. The tipping gear is suspended on the rollers R and small channel rails. Another example is the conveyor of the Brom- berger Maschinenbauanstalt, Fig. 143. Here each segment of the trough has a projection like a handle on the under side. This comes in contact with a roller, and as the front end of the pan is pivoted to the chain, and therefore kept in position vertic- ally, the back part of the pan is lifted, and this releases the previous segment, which rests on a ledge of the former, as seen in the illustration. The Humboldt Company have a similar con- veyor, though it consists of a series of bars instead of the sheet-iron pans. This is shown in Figs. 144 and 145. The bars of the grating of which each seg- ment consists are hinged at a and held together by the bolt s. The links k of the chain form a raised edge to the trough (see cross section). The free ends- of the bars are held up by the pendulum bracket b during conveyance. At the point of discharge is- the tripper c, and as soon as the rollers rx come in contact with this, the pendulum bracket is bent out of its perpendicular position, and the loose end of the bar is released and falls down as shown in the illustration. The guide plate d afterwards raises the segment into its former horizontal position, where it catches again as before. The ends of the bars are cut obliquely, so as to fall behind the bracket like the latch in a lock. The Tipping Tray Conveyors of Babcock & Wilcox .—These are illustrated in the diagram, Fig. 146. Here the discharge is independent of the track, and each pair of rollers keeps to the normal rails, the tipping being effected by a lever b, attached to the forward end of each unit. The adjustable trip-