(under subclass 624) Apparatus wherein the rotating sections each have a load-engaging portion which is in the form of a
helical surface.
(1) Note. The sections, more often than not are parallel, and the helical surfaces usually are spaced apart, although intermeshing of the surfaces sometimes is found where the load consists of bulk material.
(2) Note. The helical surfaces may, or may not, be identical insofar as concerns characteristics such as pitch, diameter, hand, or speed or direction of rotation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
663, for plural helical surfaces which act together in forming an underlying support for an article-type load, but wherein no portion of that load extends downwardly into intersecting relationship with a line drawn between the axes of two adjacent helical surfaces.
