The Mechanical Handling and Storing of Material

WORM OR ARCHIMEDEAN SCREW CONVEYORS 59 and 68. These intermediate inlets and outlets are easily understood from the illustra- tions, the former having four lifters which collect and deliver into the tube any material fed into the inlet, and yet when there is no material added at any of these intermediate inlets the flow of the material passing by is not obstructed. The intermediate outlet is a little more complicated, as it contains a loose piece of the tube with its channels, which must be removed to make an outlet, but the change can be effected in a very few minutes. It will thus be seen that the Suess tube conveyor can be fed from any number of points, and that the material can be withdrawn at any convenient point or points. It is therefore most useful, for instance, for feeding rows of silos or bins either one at a time or simultaneously. Fig. 71 shows another Suess conveyor driven by a pair of jockey pulleys. The lettering of Figs. 64 to 70 correspond with the dimensions given in the table for Suess conveyors of the three principal sizes in inches; the letter c in the table represents the pitch of the oblique blades, which stand at an angle of 45 degrees to the axis of the conveyor, and at an angle of 75 degrees to their base at the side of the tube.