US PATENT SUBCLASS 171 / 57
.~.~ Screw


Current as of: June, 1999
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171 /   HD   UNEARTHING PLANTS OR BURIED OBJECTS

50  DF  EXTRACTOR {5}
55  DF  .~ Opposed plant engagers {5}
57.~.~ Screw


DEFINITION

Classification: 171/57

(under subclass 55) Apparatus in which the extractor includes spaced members, at least one of which is in the form of a rotatable support having a helically arranged member thereon adapted to confront or engage the other of said members to cooperate therewith in feeding a buried object longitudinally of said support.

(1) Note. These helical screw extractors are usually employed to engage the foliage of a plant and lift it from the earth either with or without the help of an object-digging device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

89, and 95+, for rotary diggers which may be provided with

helical means cooperating therewith to feed the articles unearthed by the digger.