US PATENT SUBCLASS 198 / 657
.~ Screw

Current as of: June, 1999
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198 /   HD   CONVEYORS: POWER-DRIVEN

618  DF  CONVEYOR SECTION {26}
657.~ Screw {11}
658  DF  .~.~> Including rotating load confining means (e.g., tumbler)
659  DF  .~.~> Including a deformable element
660  DF  .~.~> Including an axially adjustable helical surface formation
661  DF  .~.~> Having axially varying capacity
662  DF  .~.~> Plural helical surface formations {4}
670  DF  .~.~> With means for controlling flow or to assist conveying
671  DF  .~.~> With means to assist in discharging from or feeding to the housing of the helical surface information
672  DF  .~.~> Including bearing means {1}
674  DF  .~.~> Including drive means {1}
676  DF  .~.~> Helical surface formation structure
677  DF  .~.~> With means for securing helical surface formation to driving member

DEFINITION

Classification: 198/657

(under subclass 618) Apparatus wherein the conveyor section comprises a helical surface formation which is rotated about its longitudinal axis.

(1) Note. Screw conveyors which move articles frequently do so by providing a moving "floor" across which an article is propelled by virtue of resting thereupon (i.e., as in subclass 663), whereas a screw conveyor which moves bulk material functions in the nature of a pusher-type conveyor section.

(2) Note. A screw conveyor which moves bulk material usually is provided with a housing (conduit, trough, etc.) which forms a load support surface; however, the housing is sometimes dispensed with (e.g., a screw conveyor immersed in a bin of material may rely upon the material which surrounds its flow path for the confinement otherwise achieved by the use of a housing).

(3) Note. Usually the helical surface formation includes a core, within which lies the longitudinal axis of the formation, and which core is utilized to transmit a driving

force to the conveyor section; however, the so-called "coreless" type of helical surface formation (examples of which appear in subclass 676) is characterized by the absence of a central structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

625, for plural screw type conveyor sections which coact to engage and move a load therebetween. 642, for a thrower type conveyor section of the rotary kind wherein the impelling surfaces may be comprised of helical surfaces or segments thereof.

666+, for connections between housings of successive helical surfaces when those connections correspond with connections between the helical surfaces.

717+, for another kind of conveyor section wherein a load is pushed over a load-supporting surface, but wherein the pushing means is other than a helical surface rotating about its axis.

778, for a spiral type conveyor section wherein the load-supporting surface spiralling defines a path for the load.

SEE OR SEARCH CLASS

105, Railway Rolling Stock,

48.1, for a railway locomotive having a combustion chamber and a screw conveyor, which conveyor feeds solid fuel to the chamber.

366, Agitating,

156.1+, for a mixing chamber with a feed means therefor, and wherein a screw conveyor is provided in a feeder or supply reservoir for agitating material therein; and subclasses 318+ for a stationary mixing chamber having a rotatable stirrer of the screw type, and see particularly the subclasses indented thereunder for specific kinds of screw structure.

406, Conveyors: Fluid Current,

53+, for a screw conveyor combined with a fluid current conveyor.

416, Fluid Reaction Surfaces (i.e., Impellers), 176+, for a fluid impeller having a working surface in the form of a spiral.